mpeg4videodec.c 135 KB
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/*
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 * MPEG-4 decoder
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 * Copyright (c) 2000,2001 Fabrice Bellard
 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#define UNCHECKED_BITSTREAM_READER 1

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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "error_resilience.h"
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#include "hwaccel.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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#include "mpeg4video.h"
#include "h263.h"
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#include "profiles.h"
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#include "thread.h"
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#include "xvididct.h"
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#include "unary.h"
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/* The defines below define the number of bits that are read at once for
 * reading vlc values. Changing these may improve speed and data cache needs
 * be aware though that decreasing them may need the number of stages that is
 * passed to get_vlc* to be increased. */
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#define SPRITE_TRAJ_VLC_BITS 6
#define DC_VLC_BITS 9
#define MB_TYPE_B_VLC_BITS 4
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#define STUDIO_INTRA_BITS 9
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static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);

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static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;

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static const int mb_type_b_map[4] = {
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    MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
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    MB_TYPE_L0L1    | MB_TYPE_16x16,
    MB_TYPE_L1      | MB_TYPE_16x16,
    MB_TYPE_L0      | MB_TYPE_16x16,
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};

/**
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 * Predict the ac.
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 * @param n block index (0-3 are luma, 4-5 are chroma)
 * @param dir the ac prediction direction
 */
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void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
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{
    int i;
    int16_t *ac_val, *ac_val1;
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    int8_t *const qscale_table = s->current_picture.qscale_table;
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    /* find prediction */
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    ac_val  = &s->ac_val[0][0][0] + s->block_index[n] * 16;
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    ac_val1 = ac_val;
    if (s->ac_pred) {
        if (dir == 0) {
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            const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
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            /* left prediction */
            ac_val -= 16;

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            if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
                n == 1 || n == 3) {
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                /* same qscale */
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                for (i = 1; i < 8; i++)
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                    block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
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            } else {
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                /* different qscale, we must rescale */
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                for (i = 1; i < 8; i++)
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                    block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
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            }
        } else {
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            const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
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            /* top prediction */
            ac_val -= 16 * s->block_wrap[n];

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            if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
                n == 2 || n == 3) {
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                /* same qscale */
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                for (i = 1; i < 8; i++)
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                    block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
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            } else {
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                /* different qscale, we must rescale */
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                for (i = 1; i < 8; i++)
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                    block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
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            }
        }
    }
    /* left copy */
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    for (i = 1; i < 8; i++)
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        ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
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    /* top copy */
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    for (i = 1; i < 8; i++)
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        ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
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}

/**
 * check if the next stuff is a resync marker or the end.
 * @return 0 if not
 */
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static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
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{
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    MpegEncContext *s = &ctx->m;
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    int bits_count = get_bits_count(&s->gb);
    int v          = show_bits(&s->gb, 16);
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    if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
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        return 0;

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    while (v <= 0xFF) {
        if (s->pict_type == AV_PICTURE_TYPE_B ||
            (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
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            break;
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        skip_bits(&s->gb, 8 + s->pict_type);
        bits_count += 8 + s->pict_type;
        v = show_bits(&s->gb, 16);
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    }

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    if (bits_count + 8 >= s->gb.size_in_bits) {
        v >>= 8;
        v  |= 0x7F >> (7 - (bits_count & 7));
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        if (v == 0x7F)
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            return s->mb_num;
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    } else {
        if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
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            int len, mb_num;
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            int mb_num_bits = av_log2(s->mb_num - 1) + 1;
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            GetBitContext gb = s->gb;
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            skip_bits(&s->gb, 1);
            align_get_bits(&s->gb);

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            for (len = 0; len < 32; len++)
                if (get_bits1(&s->gb))
                    break;
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            mb_num = get_bits(&s->gb, mb_num_bits);
            if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
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                mb_num= -1;

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            s->gb = gb;
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            if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
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                return mb_num;
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        }
    }
    return 0;
}

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static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
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{
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    MpegEncContext *s = &ctx->m;
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    int a     = 2 << s->sprite_warping_accuracy;
    int rho   = 3  - s->sprite_warping_accuracy;
    int r     = 16 / a;
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    int alpha = 1;
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    int beta  = 0;
    int w     = s->width;
    int h     = s->height;
    int min_ab, i, w2, h2, w3, h3;
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    int sprite_ref[4][2];
    int virtual_ref[2][2];
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    int64_t sprite_offset[2][2];
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    int64_t sprite_delta[2][2];
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    // only true for rectangle shapes
    const int vop_ref[4][2] = { { 0, 0 },         { s->width, 0 },
                                { 0, s->height }, { s->width, s->height } };
    int d[4][2]             = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
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    if (w <= 0 || h <= 0)
        return AVERROR_INVALIDDATA;
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    /* the decoder was not properly initialized and we cannot continue */
    if (sprite_trajectory.table == NULL)
        return AVERROR_INVALIDDATA;

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    for (i = 0; i < ctx->num_sprite_warping_points; i++) {
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        int length;
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        int x = 0, y = 0;
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        length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
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        if (length > 0)
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            x = get_xbits(gb, length);
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210
        if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
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            check_marker(s->avctx, gb, "before sprite_trajectory");
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        length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
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        if (length > 0)
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            y = get_xbits(gb, length);

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        check_marker(s->avctx, gb, "after sprite_trajectory");
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        ctx->sprite_traj[i][0] = d[i][0] = x;
        ctx->sprite_traj[i][1] = d[i][1] = y;
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    }
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    for (; i < 4; i++)
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        ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
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    while ((1 << alpha) < w)
        alpha++;
    while ((1 << beta) < h)
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        beta++;  /* typo in the MPEG-4 std for the definition of w' and h' */
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    w2 = 1 << alpha;
    h2 = 1 << beta;

    // Note, the 4th point isn't used for GMC
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    if (ctx->divx_version == 500 && ctx->divx_build == 413) {
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        sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
        sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
        sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
        sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
        sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
        sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
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    } else {
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        sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
        sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
        sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
        sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
        sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
        sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
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    }
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    /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
     * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */

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    /* This is mostly identical to the MPEG-4 std (and is totally unreadable
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     * because of that...). Perhaps it should be reordered to be more readable.
     * The idea behind this virtual_ref mess is to be able to use shifts later
     * per pixel instead of divides so the distance between points is converted
     * from w&h based to w2&h2 based which are of the 2^x form. */
    virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
                         ROUNDED_DIV(((w - w2) *
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                                           (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
                                      w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
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    virtual_ref[0][1] = 16 * vop_ref[0][1] +
                        ROUNDED_DIV(((w - w2) *
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                                          (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
                                     w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
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    virtual_ref[1][0] = 16 * vop_ref[0][0] +
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                        ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
                                           h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
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    virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
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                        ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
                                           h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
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    switch (ctx->num_sprite_warping_points) {
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    case 0:
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        sprite_offset[0][0]    =
        sprite_offset[0][1]    =
        sprite_offset[1][0]    =
        sprite_offset[1][1]    = 0;
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        sprite_delta[0][0]     = a;
        sprite_delta[0][1]     =
        sprite_delta[1][0]     = 0;
        sprite_delta[1][1]     = a;
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        ctx->sprite_shift[0]   =
        ctx->sprite_shift[1]   = 0;
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        break;
    case 1:     // GMC only
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        sprite_offset[0][0]    = sprite_ref[0][0] - a * vop_ref[0][0];
        sprite_offset[0][1]    = sprite_ref[0][1] - a * vop_ref[0][1];
        sprite_offset[1][0]    = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
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                                 a * (vop_ref[0][0] / 2);
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        sprite_offset[1][1]    = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
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                                 a * (vop_ref[0][1] / 2);
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        sprite_delta[0][0]     = a;
        sprite_delta[0][1]     =
        sprite_delta[1][0]     = 0;
        sprite_delta[1][1]     = a;
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        ctx->sprite_shift[0]   =
        ctx->sprite_shift[1]   = 0;
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        break;
    case 2:
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        sprite_offset[0][0]    = ((int64_t)      sprite_ref[0][0] * (1 << alpha + rho)) +
                                 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
                                 ((int64_t)        -vop_ref[0][0]) +
                                 ((int64_t)  r * sprite_ref[0][1] - virtual_ref[0][1]) *
                                 ((int64_t)        -vop_ref[0][1]) + (1 << (alpha + rho - 1));
        sprite_offset[0][1]    = ((int64_t)      sprite_ref[0][1] * (1 << alpha + rho)) +
                                 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
                                 ((int64_t)        -vop_ref[0][0]) +
                                 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
                                 ((int64_t)        -vop_ref[0][1]) + (1 << (alpha + rho - 1));
        sprite_offset[1][0]    = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
                                  ((int64_t)-2 *    vop_ref[0][0] + 1) +
                                  ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
                                  ((int64_t)-2 *    vop_ref[0][1] + 1) + 2 * w2 * r *
                                   (int64_t)     sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
        sprite_offset[1][1]    = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
                                  ((int64_t)-2 *    vop_ref[0][0] + 1) +
                                  ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
                                  ((int64_t)-2 *    vop_ref[0][1] + 1) + 2 * w2 * r *
                                  (int64_t)      sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
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        sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
        sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
        sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
        sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
322

323 324
        ctx->sprite_shift[0]  = alpha + rho;
        ctx->sprite_shift[1]  = alpha + rho + 2;
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        break;
    case 3:
        min_ab = FFMIN(alpha, beta);
        w3     = w2 >> min_ab;
        h3     = h2 >> min_ab;
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        sprite_offset[0][0]    = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
                                 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
                                 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
                                 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
        sprite_offset[0][1]    = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
                                 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
                                 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
                                 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
        sprite_offset[1][0]    = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
                                 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
                                  (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
                                 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
        sprite_offset[1][1]    = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
                                 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
                                  (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
                                 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
346 347 348 349
        sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
        sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
        sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
        sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
350

351 352
        ctx->sprite_shift[0]  = alpha + beta + rho - min_ab;
        ctx->sprite_shift[1]  = alpha + beta + rho - min_ab + 2;
353
        break;
354 355
    }
    /* try to simplify the situation */
356 357 358 359
    if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
        sprite_delta[0][1] == 0 &&
        sprite_delta[1][0] == 0 &&
        sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
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        sprite_offset[0][0] >>= ctx->sprite_shift[0];
        sprite_offset[0][1] >>= ctx->sprite_shift[0];
        sprite_offset[1][0] >>= ctx->sprite_shift[1];
        sprite_offset[1][1] >>= ctx->sprite_shift[1];
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        sprite_delta[0][0] = a;
        sprite_delta[0][1] = 0;
        sprite_delta[1][0] = 0;
        sprite_delta[1][1] = a;
368 369
        ctx->sprite_shift[0] = 0;
        ctx->sprite_shift[1] = 0;
370 371
        s->real_sprite_warping_points = 1;
    } else {
372 373
        int shift_y = 16 - ctx->sprite_shift[0];
        int shift_c = 16 - ctx->sprite_shift[1];
374

375 376 377 378
        for (i = 0; i < 2; i++) {
            if (shift_c < 0 || shift_y < 0 ||
                FFABS(  sprite_offset[0][i]) >= INT_MAX >> shift_y  ||
                FFABS(  sprite_offset[1][i]) >= INT_MAX >> shift_c  ||
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                FFABS(   sprite_delta[0][i]) >= INT_MAX >> shift_y  ||
                FFABS(   sprite_delta[1][i]) >= INT_MAX >> shift_y
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            ) {
                avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
                goto overflow;
            }
385 386
        }

387
        for (i = 0; i < 2; i++) {
388 389
            sprite_offset[0][i]    *= 1 << shift_y;
            sprite_offset[1][i]    *= 1 << shift_c;
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            sprite_delta[0][i]     *= 1 << shift_y;
            sprite_delta[1][i]     *= 1 << shift_y;
392
            ctx->sprite_shift[i]     = 16;
393

394 395
        }
        for (i = 0; i < 2; i++) {
396
            int64_t sd[2] = {
397 398
                sprite_delta[i][0] - a * (1LL<<16),
                sprite_delta[i][1] - a * (1LL<<16)
399 400
            };

401 402 403 404
            if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
                llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
                llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
                llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
405
                llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
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                llabs(sd[0]) >= INT_MAX ||
                llabs(sd[1]) >= INT_MAX ||
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                llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
                llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
                llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
411
            ) {
412
                avpriv_request_sample(s->avctx, "Overflow on sprite points");
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                goto overflow;
414
            }
415
        }
416
        s->real_sprite_warping_points = ctx->num_sprite_warping_points;
417
    }
418

419 420 421 422
    for (i = 0; i < 4; i++) {
        s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
        s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
    }
423

424
    return 0;
425 426 427 428
overflow:
    memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
    memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
    return AVERROR_PATCHWELCOME;
429 430
}

431
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
432
    MpegEncContext *s = &ctx->m;
433
    int len = FFMIN(ctx->time_increment_bits + 3, 15);
434 435 436 437

    get_bits(gb, len);
    if (get_bits1(gb))
        get_bits(gb, len);
438
    check_marker(s->avctx, gb, "after new_pred");
439 440 441 442

    return 0;
}

443
/**
444
 * Decode the next video packet.
445 446
 * @return <0 if something went wrong
 */
447
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
448
{
449 450
    MpegEncContext *s = &ctx->m;

451 452
    int mb_num_bits      = av_log2(s->mb_num - 1) + 1;
    int header_extension = 0, mb_num, len;
453 454

    /* is there enough space left for a video packet + header */
455
    if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
456
        return AVERROR_INVALIDDATA;
457

458 459 460
    for (len = 0; len < 32; len++)
        if (get_bits1(&s->gb))
            break;
461

462
    if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
463
        av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
464
        return AVERROR_INVALIDDATA;
465 466
    }

467
    if (ctx->shape != RECT_SHAPE) {
468 469
        header_extension = get_bits1(&s->gb);
        // FIXME more stuff here
470 471
    }

472
    mb_num = get_bits(&s->gb, mb_num_bits);
473
    if (mb_num >= s->mb_num || !mb_num) {
474 475
        av_log(s->avctx, AV_LOG_ERROR,
               "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
476
        return AVERROR_INVALIDDATA;
477 478
    }

479 480
    s->mb_x = mb_num % s->mb_width;
    s->mb_y = mb_num / s->mb_width;
481

482
    if (ctx->shape != BIN_ONLY_SHAPE) {
483 484 485
        int qscale = get_bits(&s->gb, s->quant_precision);
        if (qscale)
            s->chroma_qscale = s->qscale = qscale;
486 487
    }

488
    if (ctx->shape == RECT_SHAPE)
489 490 491 492
        header_extension = get_bits1(&s->gb);

    if (header_extension) {
        int time_incr = 0;
493 494 495 496

        while (get_bits1(&s->gb) != 0)
            time_incr++;

497
        check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
498
        skip_bits(&s->gb, ctx->time_increment_bits);      /* time_increment */
499
        check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
500 501

        skip_bits(&s->gb, 2); /* vop coding type */
502
        // FIXME not rect stuff here
503

504
        if (ctx->shape != BIN_ONLY_SHAPE) {
505
            skip_bits(&s->gb, 3); /* intra dc vlc threshold */
506 507
            // FIXME don't just ignore everything
            if (s->pict_type == AV_PICTURE_TYPE_S &&
508
                ctx->vol_sprite_usage == GMC_SPRITE) {
509
                if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
510
                    return AVERROR_INVALIDDATA;
511 512 513
                av_log(s->avctx, AV_LOG_ERROR, "untested\n");
            }

514
            // FIXME reduced res stuff here
515

516
            if (s->pict_type != AV_PICTURE_TYPE_I) {
517
                int f_code = get_bits(&s->gb, 3);       /* fcode_for */
518 519 520
                if (f_code == 0)
                    av_log(s->avctx, AV_LOG_ERROR,
                           "Error, video packet header damaged (f_code=0)\n");
521
            }
522
            if (s->pict_type == AV_PICTURE_TYPE_B) {
523
                int b_code = get_bits(&s->gb, 3);
524 525 526
                if (b_code == 0)
                    av_log(s->avctx, AV_LOG_ERROR,
                           "Error, video packet header damaged (b_code=0)\n");
527 528 529
            }
        }
    }
530
    if (ctx->new_pred)
531
        decode_new_pred(ctx, &s->gb);
532 533 534 535

    return 0;
}

536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584
static void reset_studio_dc_predictors(MpegEncContext *s)
{
    /* Reset DC Predictors */
    s->last_dc[0] =
    s->last_dc[1] =
    s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
}

/**
 * Decode the next video packet.
 * @return <0 if something went wrong
 */
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
{
    MpegEncContext *s = &ctx->m;
    GetBitContext *gb = &s->gb;
    unsigned vlc_len;
    uint16_t mb_num;

    if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
        vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
        mb_num = get_bits(gb, vlc_len);

        if (mb_num >= s->mb_num)
            return AVERROR_INVALIDDATA;

        s->mb_x = mb_num % s->mb_width;
        s->mb_y = mb_num / s->mb_width;

        if (ctx->shape != BIN_ONLY_SHAPE)
            s->qscale = mpeg_get_qscale(s);

        if (get_bits1(gb)) {  /* slice_extension_flag */
            skip_bits1(gb);   /* intra_slice */
            skip_bits1(gb);   /* slice_VOP_id_enable */
            skip_bits(gb, 6); /* slice_VOP_id */
            while (get_bits1(gb)) /* extra_bit_slice */
                skip_bits(gb, 8); /* extra_information_slice */
        }

        reset_studio_dc_predictors(s);
    }
    else {
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

585
/**
586
 * Get the average motion vector for a GMC MB.
587
 * @param n either 0 for the x component or 1 for y
588
 * @return the average MV for a GMC MB
589
 */
590
static inline int get_amv(Mpeg4DecContext *ctx, int n)
591
{
592
    MpegEncContext *s = &ctx->m;
593
    int x, y, mb_v, sum, dx, dy, shift;
594 595
    int len     = 1 << (s->f_code + 4);
    const int a = s->sprite_warping_accuracy;
596

597
    if (s->workaround_bugs & FF_BUG_AMV)
598 599
        len >>= s->quarter_sample;

600
    if (s->real_sprite_warping_points == 1) {
601
        if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
602 603
            sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
        else
604
            sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
605 606 607
    } else {
        dx    = s->sprite_delta[n][0];
        dy    = s->sprite_delta[n][1];
608
        shift = ctx->sprite_shift[0];
609 610
        if (n)
            dy -= 1 << (shift + a + 1);
611
        else
612 613 614 615 616
            dx -= 1 << (shift + a + 1);
        mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;

        sum = 0;
        for (y = 0; y < 16; y++) {
617 618
            int v;

619 620 621 622 623
            v = mb_v + dy * y;
            // FIXME optimize
            for (x = 0; x < 16; x++) {
                sum += v >> shift;
                v   += dx;
624 625
            }
        }
626
        sum = RSHIFT(sum, a + 8 - s->quarter_sample);
627 628
    }

629 630 631 632
    if (sum < -len)
        sum = -len;
    else if (sum >= len)
        sum = len - 1;
633 634 635 636 637

    return sum;
}

/**
638
 * Decode the dc value.
639 640 641 642
 * @param n block index (0-3 are luma, 4-5 are chroma)
 * @param dir_ptr the prediction direction will be stored here
 * @return the quantized dc
 */
643
static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
644 645 646 647 648 649 650
{
    int level, code;

    if (n < 4)
        code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
    else
        code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
651 652

    if (code < 0 || code > 9 /* && s->nbit < 9 */) {
653
        av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
654
        return AVERROR_INVALIDDATA;
655
    }
656

657 658 659
    if (code == 0) {
        level = 0;
    } else {
660 661 662 663 664 665
        if (IS_3IV1) {
            if (code == 1)
                level = 2 * get_bits1(&s->gb) - 1;
            else {
                if (get_bits1(&s->gb))
                    level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
666
                else
667
                    level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
668
            }
669
        } else {
670 671 672
            level = get_xbits(&s->gb, code);
        }

673 674
        if (code > 8) {
            if (get_bits1(&s->gb) == 0) { /* marker */
675
                if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
676
                    av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
677
                    return AVERROR_INVALIDDATA;
678 679 680 681 682 683 684 685 686
                }
            }
        }
    }

    return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
}

/**
687
 * Decode first partition.
688 689
 * @return number of MBs decoded or <0 if an error occurred
 */
690
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
691
{
692
    MpegEncContext *s = &ctx->m;
693
    int mb_num = 0;
694 695 696
    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };

    /* decode first partition */
697 698
    s->first_slice_line = 1;
    for (; s->mb_y < s->mb_height; s->mb_y++) {
699
        ff_init_block_index(s);
700 701
        for (; s->mb_x < s->mb_width; s->mb_x++) {
            const int xy = s->mb_x + s->mb_y * s->mb_stride;
702
            int cbpc;
703
            int dir = 0;
704 705 706

            mb_num++;
            ff_update_block_index(s);
707 708
            if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
                s->first_slice_line = 0;
709

710
            if (s->pict_type == AV_PICTURE_TYPE_I) {
711 712
                int i;

713 714 715
                do {
                    if (show_bits_long(&s->gb, 19) == DC_MARKER)
                        return mb_num - 1;
716

717
                    cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
718 719
                    if (cbpc < 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
720
                               "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
721
                        return AVERROR_INVALIDDATA;
722
                    }
723
                } while (cbpc == 8);
724

725
                s->cbp_table[xy]               = cbpc & 3;
726
                s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
727
                s->mb_intra                    = 1;
728

729
                if (cbpc & 4)
730 731
                    ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);

732 733 734 735
                s->current_picture.qscale_table[xy] = s->qscale;

                s->mbintra_table[xy] = 1;
                for (i = 0; i < 6; i++) {
736
                    int dc_pred_dir;
737 738 739 740
                    int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
                    if (dc < 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
741
                        return dc;
742
                    }
743 744 745
                    dir <<= 1;
                    if (dc_pred_dir)
                        dir |= 1;
746
                }
747 748
                s->pred_dir_table[xy] = dir;
            } else { /* P/S_TYPE */
749
                int mx, my, pred_x, pred_y, bits;
750 751
                int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
                const int stride       = s->b8_stride * 2;
752 753

try_again:
754 755 756 757
                bits = show_bits(&s->gb, 17);
                if (bits == MOTION_MARKER)
                    return mb_num - 1;

758
                skip_bits1(&s->gb);
759
                if (bits & 0x10000) {
760
                    /* skip mb */
761
                    if (s->pict_type == AV_PICTURE_TYPE_S &&
762
                        ctx->vol_sprite_usage == GMC_SPRITE) {
763 764 765 766
                        s->current_picture.mb_type[xy] = MB_TYPE_SKIP  |
                                                         MB_TYPE_16x16 |
                                                         MB_TYPE_GMC   |
                                                         MB_TYPE_L0;
767 768
                        mx = get_amv(ctx, 0);
                        my = get_amv(ctx, 1);
769 770 771 772 773
                    } else {
                        s->current_picture.mb_type[xy] = MB_TYPE_SKIP  |
                                                         MB_TYPE_16x16 |
                                                         MB_TYPE_L0;
                        mx = my = 0;
774
                    }
775 776 777 778 779 780 781 782 783 784
                    mot_val[0]          =
                    mot_val[2]          =
                    mot_val[0 + stride] =
                    mot_val[2 + stride] = mx;
                    mot_val[1]          =
                    mot_val[3]          =
                    mot_val[1 + stride] =
                    mot_val[3 + stride] = my;

                    if (s->mbintra_table[xy])
785 786 787 788
                        ff_clean_intra_table_entries(s);
                    continue;
                }

789
                cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
790 791
                if (cbpc < 0) {
                    av_log(s->avctx, AV_LOG_ERROR,
792
                           "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
793
                    return AVERROR_INVALIDDATA;
794
                }
795
                if (cbpc == 20)
796 797
                    goto try_again;

798
                s->cbp_table[xy] = cbpc & (8 + 3);  // 8 is dquant
799 800 801

                s->mb_intra = ((cbpc & 4) != 0);

802
                if (s->mb_intra) {
803
                    s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
804 805 806 807 808 809 810 811 812 813 814
                    s->mbintra_table[xy] = 1;
                    mot_val[0]          =
                    mot_val[2]          =
                    mot_val[0 + stride] =
                    mot_val[2 + stride] = 0;
                    mot_val[1]          =
                    mot_val[3]          =
                    mot_val[1 + stride] =
                    mot_val[3 + stride] = 0;
                } else {
                    if (s->mbintra_table[xy])
815 816
                        ff_clean_intra_table_entries(s);

817
                    if (s->pict_type == AV_PICTURE_TYPE_S &&
818
                        ctx->vol_sprite_usage == GMC_SPRITE &&
819 820 821 822
                        (cbpc & 16) == 0)
                        s->mcsel = get_bits1(&s->gb);
                    else
                        s->mcsel = 0;
823 824 825 826

                    if ((cbpc & 16) == 0) {
                        /* 16x16 motion prediction */

827
                        ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
828
                        if (!s->mcsel) {
829
                            mx = ff_h263_decode_motion(s, pred_x, s->f_code);
830
                            if (mx >= 0xffff)
831
                                return AVERROR_INVALIDDATA;
832

833
                            my = ff_h263_decode_motion(s, pred_y, s->f_code);
834
                            if (my >= 0xffff)
835
                                return AVERROR_INVALIDDATA;
836 837
                            s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
                                                             MB_TYPE_L0;
838
                        } else {
839 840
                            mx = get_amv(ctx, 0);
                            my = get_amv(ctx, 1);
841 842 843
                            s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
                                                             MB_TYPE_GMC   |
                                                             MB_TYPE_L0;
844 845
                        }

846 847 848 849 850 851 852 853
                        mot_val[0]          =
                        mot_val[2]          =
                        mot_val[0 + stride] =
                        mot_val[2 + stride] = mx;
                        mot_val[1]          =
                        mot_val[3]          =
                        mot_val[1 + stride] =
                        mot_val[3 + stride] = my;
854 855
                    } else {
                        int i;
856 857 858 859
                        s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
                                                         MB_TYPE_L0;
                        for (i = 0; i < 4; i++) {
                            int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
860
                            mx = ff_h263_decode_motion(s, pred_x, s->f_code);
861
                            if (mx >= 0xffff)
862
                                return AVERROR_INVALIDDATA;
863

864
                            my = ff_h263_decode_motion(s, pred_y, s->f_code);
865
                            if (my >= 0xffff)
866
                                return AVERROR_INVALIDDATA;
867 868 869 870 871 872 873
                            mot_val[0] = mx;
                            mot_val[1] = my;
                        }
                    }
                }
            }
        }
874
        s->mb_x = 0;
875 876 877 878 879 880 881 882 883
    }

    return mb_num;
}

/**
 * decode second partition.
 * @return <0 if an error occurred
 */
884 885 886
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
{
    int mb_num = 0;
887 888
    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };

889 890 891
    s->mb_x = s->resync_mb_x;
    s->first_slice_line = 1;
    for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
892
        ff_init_block_index(s);
893 894
        for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
            const int xy = s->mb_x + s->mb_y * s->mb_stride;
895 896 897

            mb_num++;
            ff_update_block_index(s);
898 899 900 901 902 903 904 905 906
            if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
                s->first_slice_line = 0;

            if (s->pict_type == AV_PICTURE_TYPE_I) {
                int ac_pred = get_bits1(&s->gb);
                int cbpy    = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
                if (cbpy < 0) {
                    av_log(s->avctx, AV_LOG_ERROR,
                           "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
907
                    return AVERROR_INVALIDDATA;
908 909
                }

910 911 912
                s->cbp_table[xy]               |= cbpy << 2;
                s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
            } else { /* P || S_TYPE */
913
                if (IS_INTRA(s->current_picture.mb_type[xy])) {
914 915
                    int i;
                    int dir     = 0;
916
                    int ac_pred = get_bits1(&s->gb);
917
                    int cbpy    = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
918

919 920 921
                    if (cbpy < 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
922
                        return AVERROR_INVALIDDATA;
923 924
                    }

925
                    if (s->cbp_table[xy] & 8)
926
                        ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
927
                    s->current_picture.qscale_table[xy] = s->qscale;
928

929
                    for (i = 0; i < 6; i++) {
930
                        int dc_pred_dir;
931 932 933 934
                        int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
                        if (dc < 0) {
                            av_log(s->avctx, AV_LOG_ERROR,
                                   "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
935
                            return dc;
936
                        }
937 938 939
                        dir <<= 1;
                        if (dc_pred_dir)
                            dir |= 1;
940
                    }
941 942 943 944
                    s->cbp_table[xy]               &= 3;  // remove dquant
                    s->cbp_table[xy]               |= cbpy << 2;
                    s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
                    s->pred_dir_table[xy]           = dir;
945 946
                } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
                    s->current_picture.qscale_table[xy] = s->qscale;
947 948
                    s->cbp_table[xy]                    = 0;
                } else {
949
                    int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
950

951 952 953
                    if (cbpy < 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
954
                        return AVERROR_INVALIDDATA;
955 956
                    }

957
                    if (s->cbp_table[xy] & 8)
958
                        ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
959
                    s->current_picture.qscale_table[xy] = s->qscale;
960

961 962
                    s->cbp_table[xy] &= 3;  // remove dquant
                    s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
963 964 965
                }
            }
        }
966 967 968
        if (mb_num >= mb_count)
            return 0;
        s->mb_x = 0;
969 970 971 972 973
    }
    return 0;
}

/**
974
 * Decode the first and second partition.
975 976
 * @return <0 if error (and sets error type in the error_status_table)
 */
977
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
978
{
979
    MpegEncContext *s = &ctx->m;
980
    int mb_num;
981
    int ret;
982 983
    const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
    const int part_a_end   = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END   | ER_MV_END)   : ER_MV_END;
984

985
    mb_num = mpeg4_decode_partition_a(ctx);
986
    if (mb_num <= 0) {
987 988
        ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                        s->mb_x, s->mb_y, part_a_error);
989
        return mb_num ? mb_num : AVERROR_INVALIDDATA;
990 991
    }

992
    if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
993
        av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
994 995
        ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                        s->mb_x, s->mb_y, part_a_error);
996
        return AVERROR_INVALIDDATA;
997 998
    }

999
    s->mb_num_left = mb_num;
1000

1001 1002
    if (s->pict_type == AV_PICTURE_TYPE_I) {
        while (show_bits(&s->gb, 9) == 1)
1003
            skip_bits(&s->gb, 9);
1004 1005 1006 1007
        if (get_bits_long(&s->gb, 19) != DC_MARKER) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "marker missing after first I partition at %d %d\n",
                   s->mb_x, s->mb_y);
1008
            return AVERROR_INVALIDDATA;
1009
        }
1010 1011
    } else {
        while (show_bits(&s->gb, 10) == 1)
1012
            skip_bits(&s->gb, 10);
1013 1014 1015 1016
        if (get_bits(&s->gb, 17) != MOTION_MARKER) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "marker missing after first P partition at %d %d\n",
                   s->mb_x, s->mb_y);
1017
            return AVERROR_INVALIDDATA;
1018 1019
        }
    }
1020 1021
    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                    s->mb_x - 1, s->mb_y, part_a_end);
1022

1023 1024
    ret = mpeg4_decode_partition_b(s, mb_num);
    if (ret < 0) {
1025 1026 1027
        if (s->pict_type == AV_PICTURE_TYPE_P)
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                            s->mb_x, s->mb_y, ER_DC_ERROR);
1028
        return ret;
1029 1030 1031 1032
    } else {
        if (s->pict_type == AV_PICTURE_TYPE_P)
            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
                            s->mb_x - 1, s->mb_y, ER_DC_END);
1033 1034 1035 1036 1037 1038
    }

    return 0;
}

/**
1039
 * Decode a block.
1040 1041
 * @return <0 if an error occurred
 */
1042
static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1043
                                     int n, int coded, int intra, int rvlc)
1044
{
1045
    MpegEncContext *s = &ctx->m;
1046
    int level, i, last, run, qmul, qadd;
1047
    int av_uninit(dc_pred_dir);
1048 1049 1050 1051 1052 1053 1054
    RLTable *rl;
    RL_VLC_ELEM *rl_vlc;
    const uint8_t *scan_table;

    // Note intra & rvlc should be optimized away if this is inlined

    if (intra) {
1055
        if (ctx->use_intra_dc_vlc) {
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
            /* DC coef */
            if (s->partitioned_frame) {
                level = s->dc_val[0][s->block_index[n]];
                if (n < 4)
                    level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
                else
                    level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
                dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
            } else {
                level = mpeg4_decode_dc(s, n, &dc_pred_dir);
                if (level < 0)
1067
                    return level;
1068 1069 1070 1071
            }
            block[0] = level;
            i        = 0;
        } else {
1072 1073
            i = -1;
            ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
        }
        if (!coded)
            goto not_coded;

        if (rvlc) {
            rl     = &ff_rvlc_rl_intra;
            rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
        } else {
            rl     = &ff_mpeg4_rl_intra;
            rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
        }
        if (s->ac_pred) {
            if (dc_pred_dir == 0)
                scan_table = s->intra_v_scantable.permutated;  /* left */
            else
                scan_table = s->intra_h_scantable.permutated;  /* top */
        } else {
1091
            scan_table = s->intra_scantable.permutated;
1092 1093 1094
        }
        qmul = 1;
        qadd = 0;
1095 1096 1097 1098 1099 1100
    } else {
        i = -1;
        if (!coded) {
            s->block_last_index[n] = i;
            return 0;
        }
1101 1102 1103 1104
        if (rvlc)
            rl = &ff_rvlc_rl_inter;
        else
            rl = &ff_h263_rl_inter;
1105 1106 1107

        scan_table = s->intra_scantable.permutated;

1108 1109 1110 1111
        if (s->mpeg_quant) {
            qmul = 1;
            qadd = 0;
            if (rvlc)
1112
                rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1113
            else
1114
                rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1115
        } else {
1116 1117
            qmul = s->qscale << 1;
            qadd = (s->qscale - 1) | 1;
1118
            if (rvlc)
1119
                rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1120
            else
1121
                rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1122 1123
        }
    }
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
    {
        OPEN_READER(re, &s->gb);
        for (;;) {
            UPDATE_CACHE(re, &s->gb);
            GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
            if (level == 0) {
                /* escape */
                if (rvlc) {
                    if (SHOW_UBITS(re, &s->gb, 1) == 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "1. marker bit missing in rvlc esc\n");
1135
                        return AVERROR_INVALIDDATA;
1136 1137
                    }
                    SKIP_CACHE(re, &s->gb, 1);
1138

1139 1140 1141 1142
                    last = SHOW_UBITS(re, &s->gb, 1);
                    SKIP_CACHE(re, &s->gb, 1);
                    run = SHOW_UBITS(re, &s->gb, 6);
                    SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1143 1144
                    UPDATE_CACHE(re, &s->gb);

1145 1146 1147
                    if (SHOW_UBITS(re, &s->gb, 1) == 0) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "2. marker bit missing in rvlc esc\n");
1148
                        return AVERROR_INVALIDDATA;
1149 1150
                    }
                    SKIP_CACHE(re, &s->gb, 1);
1151

1152 1153
                    level = SHOW_UBITS(re, &s->gb, 11);
                    SKIP_CACHE(re, &s->gb, 11);
1154

1155 1156
                    if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
                        av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1157
                        return AVERROR_INVALIDDATA;
1158
                    }
1159
                    SKIP_CACHE(re, &s->gb, 5);
1160

1161 1162 1163
                    level = level * qmul + qadd;
                    level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                    SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1164

1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
                    i += run + 1;
                    if (last)
                        i += 192;
                } else {
                    int cache;
                    cache = GET_CACHE(re, &s->gb);

                    if (IS_3IV1)
                        cache ^= 0xC0000000;

                    if (cache & 0x80000000) {
                        if (cache & 0x40000000) {
                            /* third escape */
                            SKIP_CACHE(re, &s->gb, 2);
                            last = SHOW_UBITS(re, &s->gb, 1);
                            SKIP_CACHE(re, &s->gb, 1);
                            run = SHOW_UBITS(re, &s->gb, 6);
                            SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
                            UPDATE_CACHE(re, &s->gb);

                            if (IS_3IV1) {
                                level = SHOW_SBITS(re, &s->gb, 12);
                                LAST_SKIP_BITS(re, &s->gb, 12);
                            } else {
                                if (SHOW_UBITS(re, &s->gb, 1) == 0) {
                                    av_log(s->avctx, AV_LOG_ERROR,
                                           "1. marker bit missing in 3. esc\n");
1192
                                    if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1193
                                        return AVERROR_INVALIDDATA;
1194 1195
                                }
                                SKIP_CACHE(re, &s->gb, 1);
1196

1197 1198
                                level = SHOW_SBITS(re, &s->gb, 12);
                                SKIP_CACHE(re, &s->gb, 12);
1199

1200 1201 1202
                                if (SHOW_UBITS(re, &s->gb, 1) == 0) {
                                    av_log(s->avctx, AV_LOG_ERROR,
                                           "2. marker bit missing in 3. esc\n");
1203
                                    if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1204
                                        return AVERROR_INVALIDDATA;
1205
                                }
1206

1207
                                SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1208 1209 1210
                            }

#if 0
1211 1212 1213 1214 1215 1216
                            if (s->error_recognition >= FF_ER_COMPLIANT) {
                                const int abs_level= FFABS(level);
                                if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
                                    const int run1= run - rl->max_run[last][abs_level] - 1;
                                    if (abs_level <= rl->max_level[last][run]) {
                                        av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1217
                                        return AVERROR_INVALIDDATA;
1218 1219 1220 1221
                                    }
                                    if (s->error_recognition > FF_ER_COMPLIANT) {
                                        if (abs_level <= rl->max_level[last][run]*2) {
                                            av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1222
                                            return AVERROR_INVALIDDATA;
1223 1224 1225
                                        }
                                        if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
                                            av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1226
                                            return AVERROR_INVALIDDATA;
1227 1228
                                        }
                                    }
1229 1230 1231
                                }
                            }
#endif
1232 1233 1234 1235 1236 1237
                            if (level > 0)
                                level = level * qmul + qadd;
                            else
                                level = level * qmul - qadd;

                            if ((unsigned)(level + 2048) > 4095) {
1238
                                if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1239 1240 1241 1242
                                    if (level > 2560 || level < -2560) {
                                        av_log(s->avctx, AV_LOG_ERROR,
                                               "|level| overflow in 3. esc, qp=%d\n",
                                               s->qscale);
1243
                                        return AVERROR_INVALIDDATA;
1244 1245 1246
                                    }
                                }
                                level = level < 0 ? -2048 : 2047;
1247
                            }
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258

                            i += run + 1;
                            if (last)
                                i += 192;
                        } else {
                            /* second escape */
                            SKIP_BITS(re, &s->gb, 2);
                            GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                            i    += run + rl->max_run[run >> 7][level / qmul] + 1;  // FIXME opt indexing
                            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                            LAST_SKIP_BITS(re, &s->gb, 1);
1259
                        }
1260 1261 1262 1263 1264 1265 1266 1267
                    } else {
                        /* first escape */
                        SKIP_BITS(re, &s->gb, 1);
                        GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
                        i    += run;
                        level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul;  // FIXME opt indexing
                        level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                        LAST_SKIP_BITS(re, &s->gb, 1);
1268 1269 1270
                    }
                }
            } else {
1271
                i    += run;
1272 1273 1274
                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
                LAST_SKIP_BITS(re, &s->gb, 1);
            }
1275
            ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1276 1277 1278 1279 1280
            if (i > 62) {
                i -= 192;
                if (i & (~63)) {
                    av_log(s->avctx, AV_LOG_ERROR,
                           "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1281
                    return AVERROR_INVALIDDATA;
1282 1283 1284 1285
                }

                block[scan_table[i]] = level;
                break;
1286 1287 1288 1289
            }

            block[scan_table[i]] = level;
        }
1290
        CLOSE_READER(re, &s->gb);
1291
    }
1292 1293

not_coded:
1294
    if (intra) {
1295
        if (!ctx->use_intra_dc_vlc) {
1296 1297
            block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);

1298
            i -= i >> 31;  // if (i == -1) i = 0;
1299 1300
        }

1301
        ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1302 1303
        if (s->ac_pred)
            i = 63;  // FIXME not optimal
1304 1305 1306 1307 1308 1309 1310 1311 1312
    }
    s->block_last_index[n] = i;
    return 0;
}

/**
 * decode partition C of one MB.
 * @return <0 if an error occurred
 */
Diego Biurrun's avatar
Diego Biurrun committed
1313
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1314
{
1315
    Mpeg4DecContext *ctx = s->avctx->priv_data;
1316
    int cbp, mb_type;
1317
    const int xy = s->mb_x + s->mb_y * s->mb_stride;
1318

1319 1320
    av_assert2(s == (void*)ctx);

1321
    mb_type = s->current_picture.mb_type[xy];
1322
    cbp     = s->cbp_table[xy];
1323

1324
    ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1325

1326
    if (s->current_picture.qscale_table[xy] != s->qscale)
1327
        ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1328

1329 1330
    if (s->pict_type == AV_PICTURE_TYPE_P ||
        s->pict_type == AV_PICTURE_TYPE_S) {
1331
        int i;
1332
        for (i = 0; i < 4; i++) {
1333 1334
            s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
            s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1335 1336 1337 1338 1339
        }
        s->mb_intra = IS_INTRA(mb_type);

        if (IS_SKIP(mb_type)) {
            /* skip mb */
1340
            for (i = 0; i < 6; i++)
1341
                s->block_last_index[i] = -1;
1342
            s->mv_dir  = MV_DIR_FORWARD;
1343
            s->mv_type = MV_TYPE_16X16;
1344
            if (s->pict_type == AV_PICTURE_TYPE_S
1345
                && ctx->vol_sprite_usage == GMC_SPRITE) {
1346
                s->mcsel      = 1;
1347
                s->mb_skipped = 0;
1348 1349
            } else {
                s->mcsel      = 0;
1350 1351
                s->mb_skipped = 1;
            }
1352
        } else if (s->mb_intra) {
1353
            s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1354 1355
        } else if (!s->mb_intra) {
            // s->mcsel = 0;  // FIXME do we need to init that?
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365

            s->mv_dir = MV_DIR_FORWARD;
            if (IS_8X8(mb_type)) {
                s->mv_type = MV_TYPE_8X8;
            } else {
                s->mv_type = MV_TYPE_16X16;
            }
        }
    } else { /* I-Frame */
        s->mb_intra = 1;
1366
        s->ac_pred  = IS_ACPRED(s->current_picture.mb_type[xy]);
1367 1368 1369 1370
    }

    if (!IS_SKIP(mb_type)) {
        int i;
1371
        s->bdsp.clear_blocks(s->block[0]);
1372 1373
        /* decode each block */
        for (i = 0; i < 6; i++) {
1374
            if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1375 1376 1377
                av_log(s->avctx, AV_LOG_ERROR,
                       "texture corrupted at %d %d %d\n",
                       s->mb_x, s->mb_y, s->mb_intra);
1378
                return AVERROR_INVALIDDATA;
1379
            }
1380
            cbp += cbp;
1381 1382 1383 1384
        }
    }

    /* per-MB end of slice check */
1385
    if (--s->mb_num_left <= 0) {
1386
        if (mpeg4_is_resync(ctx))
1387 1388 1389
            return SLICE_END;
        else
            return SLICE_NOEND;
1390
    } else {
1391
        if (mpeg4_is_resync(ctx)) {
1392 1393
            const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
            if (s->cbp_table[xy + delta])
1394 1395 1396 1397 1398 1399
                return SLICE_END;
        }
        return SLICE_OK;
    }
}

1400
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1401
{
1402
    Mpeg4DecContext *ctx = s->avctx->priv_data;
1403 1404
    int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
    int16_t *mot_val;
1405
    static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1406
    const int xy = s->mb_x + s->mb_y * s->mb_stride;
1407

1408
    av_assert2(s ==  (void*)ctx);
1409
    av_assert2(s->h263_pred);
1410

1411 1412 1413
    if (s->pict_type == AV_PICTURE_TYPE_P ||
        s->pict_type == AV_PICTURE_TYPE_S) {
        do {
1414 1415 1416
            if (get_bits1(&s->gb)) {
                /* skip mb */
                s->mb_intra = 0;
1417
                for (i = 0; i < 6; i++)
1418
                    s->block_last_index[i] = -1;
1419
                s->mv_dir  = MV_DIR_FORWARD;
1420
                s->mv_type = MV_TYPE_16X16;
1421
                if (s->pict_type == AV_PICTURE_TYPE_S &&
1422
                    ctx->vol_sprite_usage == GMC_SPRITE) {
1423 1424 1425 1426 1427
                    s->current_picture.mb_type[xy] = MB_TYPE_SKIP  |
                                                     MB_TYPE_GMC   |
                                                     MB_TYPE_16x16 |
                                                     MB_TYPE_L0;
                    s->mcsel       = 1;
1428 1429
                    s->mv[0][0][0] = get_amv(ctx, 0);
                    s->mv[0][0][1] = get_amv(ctx, 1);
1430 1431 1432 1433 1434 1435
                    s->mb_skipped  = 0;
                } else {
                    s->current_picture.mb_type[xy] = MB_TYPE_SKIP  |
                                                     MB_TYPE_16x16 |
                                                     MB_TYPE_L0;
                    s->mcsel       = 0;
1436 1437
                    s->mv[0][0][0] = 0;
                    s->mv[0][0][1] = 0;
1438
                    s->mb_skipped  = 1;
1439 1440 1441
                }
                goto end;
            }
1442
            cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1443 1444
            if (cbpc < 0) {
                av_log(s->avctx, AV_LOG_ERROR,
1445
                       "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1446
                return AVERROR_INVALIDDATA;
1447
            }
1448
        } while (cbpc == 20);
1449

1450
        s->bdsp.clear_blocks(s->block[0]);
1451
        dquant      = cbpc & 8;
1452
        s->mb_intra = ((cbpc & 4) != 0);
1453 1454
        if (s->mb_intra)
            goto intra;
1455

1456
        if (s->pict_type == AV_PICTURE_TYPE_S &&
1457
            ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1458 1459 1460
            s->mcsel = get_bits1(&s->gb);
        else
            s->mcsel = 0;
1461
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1462 1463 1464 1465 1466
        if (cbpy < 0) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
            return AVERROR_INVALIDDATA;
        }
1467 1468

        cbp = (cbpc & 3) | (cbpy << 2);
1469
        if (dquant)
1470
            ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471 1472 1473
        if ((!s->progressive_sequence) &&
            (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
            s->interlaced_dct = get_bits1(&s->gb);
1474 1475 1476

        s->mv_dir = MV_DIR_FORWARD;
        if ((cbpc & 16) == 0) {
1477 1478 1479 1480
            if (s->mcsel) {
                s->current_picture.mb_type[xy] = MB_TYPE_GMC   |
                                                 MB_TYPE_16x16 |
                                                 MB_TYPE_L0;
1481
                /* 16x16 global motion prediction */
1482
                s->mv_type     = MV_TYPE_16X16;
1483 1484
                mx             = get_amv(ctx, 0);
                my             = get_amv(ctx, 1);
1485 1486
                s->mv[0][0][0] = mx;
                s->mv[0][0][1] = my;
1487 1488 1489 1490
            } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
                s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
                                                 MB_TYPE_L0   |
                                                 MB_TYPE_INTERLACED;
1491
                /* 16x8 field motion prediction */
1492
                s->mv_type = MV_TYPE_FIELD;
1493

1494 1495
                s->field_select[0][0] = get_bits1(&s->gb);
                s->field_select[0][1] = get_bits1(&s->gb);
1496

1497
                ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1498

1499
                for (i = 0; i < 2; i++) {
1500
                    mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1501
                    if (mx >= 0xffff)
1502
                        return AVERROR_INVALIDDATA;
1503

1504
                    my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1505
                    if (my >= 0xffff)
1506
                        return AVERROR_INVALIDDATA;
1507 1508 1509 1510

                    s->mv[0][i][0] = mx;
                    s->mv[0][i][1] = my;
                }
1511
            } else {
1512
                s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1513 1514
                /* 16x16 motion prediction */
                s->mv_type = MV_TYPE_16X16;
1515 1516
                ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
                mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1517 1518

                if (mx >= 0xffff)
1519
                    return AVERROR_INVALIDDATA;
1520

1521
                my = ff_h263_decode_motion(s, pred_y, s->f_code);
1522 1523

                if (my >= 0xffff)
1524
                    return AVERROR_INVALIDDATA;
1525 1526 1527 1528
                s->mv[0][0][0] = mx;
                s->mv[0][0][1] = my;
            }
        } else {
1529
            s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1530 1531
            s->mv_type                     = MV_TYPE_8X8;
            for (i = 0; i < 4; i++) {
1532
                mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1533
                mx      = ff_h263_decode_motion(s, pred_x, s->f_code);
1534
                if (mx >= 0xffff)
1535
                    return AVERROR_INVALIDDATA;
1536

1537
                my = ff_h263_decode_motion(s, pred_y, s->f_code);
1538
                if (my >= 0xffff)
1539
                    return AVERROR_INVALIDDATA;
1540 1541
                s->mv[0][i][0] = mx;
                s->mv[0][i][1] = my;
1542 1543
                mot_val[0]     = mx;
                mot_val[1]     = my;
1544 1545
            }
        }
1546 1547 1548
    } else if (s->pict_type == AV_PICTURE_TYPE_B) {
        int modb1;   // first bit of modb
        int modb2;   // second bit of modb
1549 1550
        int mb_type;

1551 1552
        s->mb_intra = 0;  // B-frames never contain intra blocks
        s->mcsel    = 0;  //      ...               true gmc blocks
1553

1554 1555 1556 1557 1558 1559
        if (s->mb_x == 0) {
            for (i = 0; i < 2; i++) {
                s->last_mv[i][0][0] =
                s->last_mv[i][0][1] =
                s->last_mv[i][1][0] =
                s->last_mv[i][1][1] = 0;
1560
            }
1561

1562
            ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1563 1564
        }

1565
        /* if we skipped it in the future P-frame than skip it now too */
1566
        s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x];  // Note, skiptab=0 if last was GMC
1567

1568 1569 1570
        if (s->mb_skipped) {
            /* skip mb */
            for (i = 0; i < 6; i++)
1571 1572
                s->block_last_index[i] = -1;

1573 1574 1575 1576 1577
            s->mv_dir      = MV_DIR_FORWARD;
            s->mv_type     = MV_TYPE_16X16;
            s->mv[0][0][0] =
            s->mv[0][0][1] =
            s->mv[1][0][0] =
1578
            s->mv[1][0][1] = 0;
1579 1580 1581
            s->current_picture.mb_type[xy] = MB_TYPE_SKIP  |
                                             MB_TYPE_16x16 |
                                             MB_TYPE_L0;
1582 1583 1584
            goto end;
        }

1585 1586 1587 1588 1589 1590 1591 1592 1593
        modb1 = get_bits1(&s->gb);
        if (modb1) {
            // like MB_TYPE_B_DIRECT but no vectors coded
            mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
            cbp     = 0;
        } else {
            modb2   = get_bits1(&s->gb);
            mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
            if (mb_type < 0) {
1594
                av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1595
                return AVERROR_INVALIDDATA;
1596
            }
1597 1598 1599 1600
            mb_type = mb_type_b_map[mb_type];
            if (modb2) {
                cbp = 0;
            } else {
1601
                s->bdsp.clear_blocks(s->block[0]);
1602
                cbp = get_bits(&s->gb, 6);
1603 1604 1605
            }

            if ((!IS_DIRECT(mb_type)) && cbp) {
1606 1607
                if (get_bits1(&s->gb))
                    ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1608 1609
            }

1610 1611 1612
            if (!s->progressive_sequence) {
                if (cbp)
                    s->interlaced_dct = get_bits1(&s->gb);
1613

1614
                if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1615 1616 1617
                    mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
                    mb_type &= ~MB_TYPE_16x16;

1618 1619 1620
                    if (USES_LIST(mb_type, 0)) {
                        s->field_select[0][0] = get_bits1(&s->gb);
                        s->field_select[0][1] = get_bits1(&s->gb);
1621
                    }
1622 1623 1624
                    if (USES_LIST(mb_type, 1)) {
                        s->field_select[1][0] = get_bits1(&s->gb);
                        s->field_select[1][1] = get_bits1(&s->gb);
1625 1626 1627 1628 1629
                    }
                }
            }

            s->mv_dir = 0;
1630 1631
            if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
                s->mv_type = MV_TYPE_16X16;
1632

1633
                if (USES_LIST(mb_type, 0)) {
1634 1635
                    s->mv_dir = MV_DIR_FORWARD;

1636 1637
                    mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
                    my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1638 1639 1640 1641 1642 1643
                    s->last_mv[0][1][0] =
                    s->last_mv[0][0][0] =
                    s->mv[0][0][0]      = mx;
                    s->last_mv[0][1][1] =
                    s->last_mv[0][0][1] =
                    s->mv[0][0][1]      = my;
1644 1645
                }

1646
                if (USES_LIST(mb_type, 1)) {
1647 1648
                    s->mv_dir |= MV_DIR_BACKWARD;

1649 1650
                    mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
                    my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1651 1652 1653 1654 1655 1656
                    s->last_mv[1][1][0] =
                    s->last_mv[1][0][0] =
                    s->mv[1][0][0]      = mx;
                    s->last_mv[1][1][1] =
                    s->last_mv[1][0][1] =
                    s->mv[1][0][1]      = my;
1657
                }
1658 1659
            } else if (!IS_DIRECT(mb_type)) {
                s->mv_type = MV_TYPE_FIELD;
1660

1661
                if (USES_LIST(mb_type, 0)) {
1662 1663
                    s->mv_dir = MV_DIR_FORWARD;

1664 1665 1666 1667 1668 1669
                    for (i = 0; i < 2; i++) {
                        mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
                        my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
                        s->last_mv[0][i][0] =
                        s->mv[0][i][0]      = mx;
                        s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1670 1671 1672
                    }
                }

1673
                if (USES_LIST(mb_type, 1)) {
1674 1675
                    s->mv_dir |= MV_DIR_BACKWARD;

1676 1677 1678 1679 1680 1681
                    for (i = 0; i < 2; i++) {
                        mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
                        my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
                        s->last_mv[1][i][0] =
                        s->mv[1][i][0]      = mx;
                        s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1682 1683 1684 1685 1686
                    }
                }
            }
        }

1687 1688 1689 1690 1691
        if (IS_DIRECT(mb_type)) {
            if (IS_SKIP(mb_type)) {
                mx =
                my = 0;
            } else {
1692 1693
                mx = ff_h263_decode_motion(s, 0, 1);
                my = ff_h263_decode_motion(s, 0, 1);
1694 1695 1696
            }

            s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1697
            mb_type  |= ff_mpeg4_set_direct_mv(s, mx, my);
1698
        }
1699
        s->current_picture.mb_type[xy] = mb_type;
1700
    } else { /* I-Frame */
1701
        do {
1702
            cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1703 1704 1705
            if (cbpc < 0) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1706
                return AVERROR_INVALIDDATA;
1707
            }
1708
        } while (cbpc == 8);
1709 1710 1711

        dquant = cbpc & 4;
        s->mb_intra = 1;
1712

1713 1714
intra:
        s->ac_pred = get_bits1(&s->gb);
1715
        if (s->ac_pred)
1716
            s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1717
        else
1718
            s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1719

1720
        cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1721 1722 1723
        if (cbpy < 0) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1724
            return AVERROR_INVALIDDATA;
1725 1726 1727
        }
        cbp = (cbpc & 3) | (cbpy << 2);

1728
        ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1729

1730
        if (dquant)
1731 1732
            ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);

1733 1734
        if (!s->progressive_sequence)
            s->interlaced_dct = get_bits1(&s->gb);
1735

1736
        s->bdsp.clear_blocks(s->block[0]);
1737 1738
        /* decode each block */
        for (i = 0; i < 6; i++) {
1739
            if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1740
                return AVERROR_INVALIDDATA;
1741
            cbp += cbp;
1742 1743 1744 1745 1746 1747
        }
        goto end;
    }

    /* decode each block */
    for (i = 0; i < 6; i++) {
1748
        if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1749
            return AVERROR_INVALIDDATA;
1750
        cbp += cbp;
1751 1752
    }

1753 1754 1755
end:
    /* per-MB end of slice check */
    if (s->codec_id == AV_CODEC_ID_MPEG4) {
1756
        int next = mpeg4_is_resync(ctx);
1757
        if (next) {
1758
            if        (s->mb_x + s->mb_y*s->mb_width + 1 >  next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1759
                return AVERROR_INVALIDDATA;
1760 1761
            } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
                return SLICE_END;
1762

1763
            if (s->pict_type == AV_PICTURE_TYPE_B) {
1764
                const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1765
                ff_thread_await_progress(&s->next_picture_ptr->tf,
1766 1767 1768
                                         (s->mb_x + delta >= s->mb_width)
                                         ? FFMIN(s->mb_y + 1, s->mb_height - 1)
                                         : s->mb_y, 0);
1769
                if (s->next_picture.mbskip_table[xy + delta])
1770 1771 1772 1773
                    return SLICE_OK;
            }

            return SLICE_END;
1774 1775 1776 1777 1778 1779
        }
    }

    return SLICE_OK;
}

1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
/* As per spec, studio start code search isn't the same as the old type of start code */
static void next_start_code_studio(GetBitContext *gb)
{
    align_get_bits(gb);

    while (get_bits_left(gb) >= 24 && show_bits_long(gb, 24) != 0x1) {
        get_bits(gb, 8);
    }
}

/* additional_code, vlc index */
static const uint8_t ac_state_tab[22][2] =
{
    {0, 0},
    {0, 1},
    {1, 1},
    {2, 1},
    {3, 1},
    {4, 1},
    {5, 1},
    {1, 2},
    {2, 2},
    {3, 2},
    {4, 2},
    {5, 2},
    {6, 2},
    {1, 3},
    {2, 4},
    {3, 5},
    {4, 6},
    {5, 7},
    {6, 8},
    {7, 9},
    {8, 10},
    {0, 11}
};

static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
{
    Mpeg4DecContext *ctx = s->avctx->priv_data;

    int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
        additional_code_len, sign, mismatch;
    VLC *cur_vlc = &ctx->studio_intra_tab[0];
    uint8_t *const scantable = s->intra_scantable.permutated;
    const uint16_t *quant_matrix;
    uint32_t flc;
    const int min = -1 *  (1 << (s->avctx->bits_per_raw_sample + 6));
    const int max =      ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);

    mismatch = 1;

    memset(block, 0, 64 * sizeof(int32_t));

    if (n < 4) {
        cc = 0;
        dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
        quant_matrix = s->intra_matrix;
    } else {
        cc = (n & 1) + 1;
        if (ctx->rgb)
            dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
        else
            dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
        quant_matrix = s->chroma_intra_matrix;
    }

    if (dct_dc_size < 0) {
        av_log(s->avctx, AV_LOG_ERROR, "illegal dct_dc_size vlc\n");
        return AVERROR_INVALIDDATA;
    } else if (dct_dc_size == 0) {
        dct_diff = 0;
    } else {
        dct_diff = get_xbits(&s->gb, dct_dc_size);

        if (dct_dc_size > 8) {
            if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
                return AVERROR_INVALIDDATA;
        }

    }

    s->last_dc[cc] += dct_diff;

    if (s->mpeg_quant)
        block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
    else
        block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
    /* TODO: support mpeg_quant for AC coefficients */

    block[0] = av_clip(block[0], min, max);
    mismatch ^= block[0];

    /* AC Coefficients */
    while (1) {
        group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);

        if (group < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
            return AVERROR_INVALIDDATA;
        }

        additional_code_len = ac_state_tab[group][0];
        cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];

        if (group == 0) {
            /* End of Block */
            break;
        } else if (group >= 1 && group <= 6) {
            /* Zero run length (Table B.47) */
            run = 1 << additional_code_len;
            if (additional_code_len)
                run += get_bits(&s->gb, additional_code_len);
            idx += run;
            continue;
        } else if (group >= 7 && group <= 12) {
            /* Zero run length and +/-1 level (Table B.48) */
            code = get_bits(&s->gb, additional_code_len);
            sign = code & 1;
            code >>= 1;
            run = (1 << (additional_code_len - 1)) + code;
            idx += run;
1902 1903
            if (idx > 63)
                return AVERROR_INVALIDDATA;
1904 1905 1906 1907
            j = scantable[idx++];
            block[j] = sign ? 1 : -1;
        } else if (group >= 13 && group <= 20) {
            /* Level value (Table B.49) */
1908 1909
            if (idx > 63)
                return AVERROR_INVALIDDATA;
1910 1911 1912 1913
            j = scantable[idx++];
            block[j] = get_xbits(&s->gb, additional_code_len);
        } else if (group == 21) {
            /* Escape */
1914 1915
            if (idx > 63)
                return AVERROR_INVALIDDATA;
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
            j = scantable[idx++];
            additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
            flc = get_bits(&s->gb, additional_code_len);
            if (flc >> (additional_code_len-1))
                block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
            else
                block[j] = flc;
        }
        block[j] = ((8 * 2 * block[j] * quant_matrix[j] * s->qscale) >> s->dct_precision) / 32;
        block[j] = av_clip(block[j], min, max);
        mismatch ^= block[j];
    }

    block[63] ^= mismatch & 1;

    return 0;
}

1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
{
    int i, j, w, h, idx = 0;
    int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
        dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
    h = 16 >> (n ? s->chroma_y_shift : 0);
    w = 16 >> (n ? s->chroma_x_shift : 0);

    block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
    if (block_mean == 0){
        av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
        return AVERROR_INVALIDDATA;
    }
    s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));

    rice_parameter = get_bits(&s->gb, 4);
    if (rice_parameter == 0) {
        av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
        return AVERROR_INVALIDDATA;
    }

    if (rice_parameter == 15)
        rice_parameter = 0;

    if (rice_parameter > 11) {
        av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
        return AVERROR_INVALIDDATA;
    }

    for (i = 0; i < h; i++) {
        output = 1 << (s->avctx->bits_per_raw_sample - 1);
        top = 1 << (s->avctx->bits_per_raw_sample - 1);

        for (j = 0; j < w; j++) {
            left = output;
            topleft = top;

            rice_prefix_code = get_unary(&s->gb, 1, 12);

            /* Escape */
            if (rice_prefix_code == 11)
                dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
            else {
1977 1978 1979 1980
                if (rice_prefix_code == 12) {
                    av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
                    return AVERROR_INVALIDDATA;
                }
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
                rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
                dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
            }

            /* Map to a signed residual */
            if (dpcm_residual & 1)
                dpcm_residual = (-1 * dpcm_residual) >> 1;
            else
                dpcm_residual = (dpcm_residual >> 1);

            if (i != 0)
                top = macroblock[idx-w];

            p = left + top - topleft;
            min_left_top = FFMIN(left, top);
            if (p < min_left_top)
                p = min_left_top;

            max_left_top = FFMAX(left, top);
            if (p > max_left_top)
                p = max_left_top;

            p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
            if (p2 == p)
                p2 = block_mean;

            if (p2 > p)
                dpcm_residual *= -1;

            macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
        }
    }

    return 0;
}

2017 2018 2019 2020
static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
{
    int i;

2021 2022
    s->dpcm_direction = 0;

2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
    /* StudioMacroblock */
    /* Assumes I-VOP */
    s->mb_intra = 1;
    if (get_bits1(&s->gb)) { /* compression_mode */
        /* DCT */
        /* macroblock_type, 1 or 2-bit VLC */
        if (!get_bits1(&s->gb)) {
            skip_bits1(&s->gb);
            s->qscale = mpeg_get_qscale(s);
        }

        for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
            if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
                return AVERROR_INVALIDDATA;
        }
    } else {
        /* DPCM */
        check_marker(s->avctx, &s->gb, "DPCM block start");
2041 2042 2043 2044 2045
        s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
        for (i = 0; i < 3; i++) {
            if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
                return AVERROR_INVALIDDATA;
        }
2046 2047 2048 2049 2050 2051 2052
    }

    if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
        next_start_code_studio(&s->gb);
        return SLICE_END;
    }

2053 2054 2055 2056 2057 2058 2059 2060
    //vcon-stp9L1.bits (first frame)
    if (get_bits_left(&s->gb) == 0)
        return SLICE_END;

    //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
    if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
        return SLICE_END;

2061 2062 2063
    return SLICE_OK;
}

2064 2065
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
{
2066 2067
    int hours, minutes, seconds;

2068
    if (!show_bits(gb, 23)) {
2069
        av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2070
        return AVERROR_INVALIDDATA;
2071 2072
    }

2073 2074
    hours   = get_bits(gb, 5);
    minutes = get_bits(gb, 6);
2075
    check_marker(s->avctx, gb, "in gop_header");
2076
    seconds = get_bits(gb, 6);
2077

2078
    s->time_base = seconds + 60*(minutes + 60*hours);
2079 2080 2081 2082 2083 2084 2085

    skip_bits1(gb);
    skip_bits1(gb);

    return 0;
}

2086
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2087
{
2088

2089 2090
    *profile = get_bits(gb, 4);
    *level   = get_bits(gb, 4);
2091

2092
    // for Simple profile, level 0
2093 2094
    if (*profile == 0 && *level == 8) {
        *level = 0;
2095
    }
2096

2097
    return 0;
2098 2099
}

2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113
static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
{
    int visual_object_type;
    int is_visual_object_identifier = get_bits1(gb);

    if (is_visual_object_identifier) {
        skip_bits(gb, 4+3);
    }
    visual_object_type = get_bits(gb, 4);

    if (visual_object_type == VOT_VIDEO_ID ||
        visual_object_type == VOT_STILL_TEXTURE_ID) {
        int video_signal_type = get_bits1(gb);
        if (video_signal_type) {
2114 2115 2116 2117
            int video_range, color_description;
            skip_bits(gb, 3); // video_format
            video_range = get_bits1(gb);
            color_description = get_bits1(gb);
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131

            s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;

            if (color_description) {
                s->avctx->color_primaries = get_bits(gb, 8);
                s->avctx->color_trc       = get_bits(gb, 8);
                s->avctx->colorspace      = get_bits(gb, 8);
            }
        }
    }

    return 0;
}

2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
static void mpeg4_load_default_matrices(MpegEncContext *s)
{
    int i, v;

    /* load default matrices */
    for (i = 0; i < 64; i++) {
        int j = s->idsp.idct_permutation[i];
        v = ff_mpeg4_default_intra_matrix[i];
        s->intra_matrix[j]        = v;
        s->chroma_intra_matrix[j] = v;

        v = ff_mpeg4_default_non_intra_matrix[i];
        s->inter_matrix[j]        = v;
        s->chroma_inter_matrix[j] = v;
    }
}

2149
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2150
{
2151
    MpegEncContext *s = &ctx->m;
2152 2153 2154
    int width, height, vo_ver_id;

    /* vol header */
2155 2156
    skip_bits(gb, 1);                   /* random access */
    s->vo_type = get_bits(gb, 8);
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173

    /* If we are in studio profile (per vo_type), check if its all consistent
     * and if so continue pass control to decode_studio_vol_header().
     * elIf something is inconsistent, error out
     * else continue with (non studio) vol header decpoding.
     */
    if (s->vo_type == CORE_STUDIO_VO_TYPE ||
        s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
        if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
            return AVERROR_INVALIDDATA;
        s->studio_profile = 1;
        s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
        return decode_studio_vol_header(ctx, gb);
    } else if (s->studio_profile) {
        return AVERROR_PATCHWELCOME;
    }

2174 2175 2176
    if (get_bits1(gb) != 0) {           /* is_ol_id */
        vo_ver_id = get_bits(gb, 4);    /* vo_ver_id */
        skip_bits(gb, 3);               /* vo_priority */
2177 2178 2179
    } else {
        vo_ver_id = 1;
    }
2180 2181 2182 2183 2184 2185
    s->aspect_ratio_info = get_bits(gb, 4);
    if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
        s->avctx->sample_aspect_ratio.num = get_bits(gb, 8);  // par_width
        s->avctx->sample_aspect_ratio.den = get_bits(gb, 8);  // par_height
    } else {
        s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2186 2187
    }

2188
    if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2189 2190
        int chroma_format = get_bits(gb, 2);
        if (chroma_format != CHROMA_420)
2191
            av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2192 2193 2194

        s->low_delay = get_bits1(gb);
        if (get_bits1(gb)) {    /* vbv parameters */
2195
            get_bits(gb, 15);   /* first_half_bitrate */
2196
            check_marker(s->avctx, gb, "after first_half_bitrate");
2197
            get_bits(gb, 15);   /* latter_half_bitrate */
2198
            check_marker(s->avctx, gb, "after latter_half_bitrate");
2199
            get_bits(gb, 15);   /* first_half_vbv_buffer_size */
2200
            check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2201 2202
            get_bits(gb, 3);    /* latter_half_vbv_buffer_size */
            get_bits(gb, 11);   /* first_half_vbv_occupancy */
2203
            check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2204
            get_bits(gb, 15);   /* latter_half_vbv_occupancy */
2205
            check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2206
        }
2207 2208
    } else {
        /* is setting low delay flag only once the smartest thing to do?
2209
         * low delay detection will not be overridden. */
2210 2211 2212 2213 2214 2215 2216 2217 2218 2219
        if (s->picture_number == 0) {
            switch(s->vo_type) {
            case SIMPLE_VO_TYPE:
            case ADV_SIMPLE_VO_TYPE:
                s->low_delay = 1;
                break;
            default:
                s->low_delay = 0;
            }
        }
2220 2221
    }

2222 2223
    ctx->shape = get_bits(gb, 2); /* vol shape */
    if (ctx->shape != RECT_SHAPE)
2224
        av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2225
    if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2226
        av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2227
        skip_bits(gb, 4);  /* video_object_layer_shape_extension */
2228 2229
    }

2230
    check_marker(s->avctx, gb, "before time_increment_resolution");
2231

2232 2233 2234
    s->avctx->framerate.num = get_bits(gb, 16);
    if (!s->avctx->framerate.num) {
        av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2235
        return AVERROR_INVALIDDATA;
2236 2237
    }

2238
    ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2239 2240
    if (ctx->time_increment_bits < 1)
        ctx->time_increment_bits = 1;
2241

2242
    check_marker(s->avctx, gb, "before fixed_vop_rate");
2243

2244
    if (get_bits1(gb) != 0)     /* fixed_vop_rate  */
2245
        s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2246
    else
2247
        s->avctx->framerate.den = 1;
2248

2249
    s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2250

2251
    ctx->t_frame = 0;
2252

2253 2254
    if (ctx->shape != BIN_ONLY_SHAPE) {
        if (ctx->shape == RECT_SHAPE) {
2255
            check_marker(s->avctx, gb, "before width");
2256
            width = get_bits(gb, 13);
2257
            check_marker(s->avctx, gb, "before height");
2258
            height = get_bits(gb, 13);
2259
            check_marker(s->avctx, gb, "after height");
2260 2261
            if (width && height &&  /* they should be non zero but who knows */
                !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2262 2263 2264
                if (s->width && s->height &&
                    (s->width != width || s->height != height))
                    s->context_reinit = 1;
2265
                s->width  = width;
2266 2267 2268 2269
                s->height = height;
            }
        }

2270 2271 2272 2273 2274
        s->progressive_sequence  =
        s->progressive_frame     = get_bits1(gb) ^ 1;
        s->interlaced_dct        = 0;
        if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
            av_log(s->avctx, AV_LOG_INFO,           /* OBMC Disable */
2275
                   "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2276
        if (vo_ver_id == 1)
2277
            ctx->vol_sprite_usage = get_bits1(gb);    /* vol_sprite_usage */
2278
        else
2279
            ctx->vol_sprite_usage = get_bits(gb, 2);  /* vol_sprite_usage */
2280

2281
        if (ctx->vol_sprite_usage == STATIC_SPRITE)
2282
            av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2283 2284 2285
        if (ctx->vol_sprite_usage == STATIC_SPRITE ||
            ctx->vol_sprite_usage == GMC_SPRITE) {
            if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2286
                skip_bits(gb, 13); // sprite_width
2287
                check_marker(s->avctx, gb, "after sprite_width");
2288
                skip_bits(gb, 13); // sprite_height
2289
                check_marker(s->avctx, gb, "after sprite_height");
2290
                skip_bits(gb, 13); // sprite_left
2291
                check_marker(s->avctx, gb, "after sprite_left");
2292
                skip_bits(gb, 13); // sprite_top
2293
                check_marker(s->avctx, gb, "after sprite_top");
2294
            }
2295 2296
            ctx->num_sprite_warping_points = get_bits(gb, 6);
            if (ctx->num_sprite_warping_points > 3) {
2297 2298
                av_log(s->avctx, AV_LOG_ERROR,
                       "%d sprite_warping_points\n",
2299 2300
                       ctx->num_sprite_warping_points);
                ctx->num_sprite_warping_points = 0;
2301
                return AVERROR_INVALIDDATA;
2302
            }
2303
            s->sprite_warping_accuracy  = get_bits(gb, 2);
2304
            ctx->sprite_brightness_change = get_bits1(gb);
2305
            if (ctx->vol_sprite_usage == STATIC_SPRITE)
2306
                skip_bits1(gb); // low_latency_sprite
2307 2308 2309
        }
        // FIXME sadct disable bit if verid!=1 && shape not rect

2310 2311 2312 2313 2314 2315 2316
        if (get_bits1(gb) == 1) {                   /* not_8_bit */
            s->quant_precision = get_bits(gb, 4);   /* quant_precision */
            if (get_bits(gb, 4) != 8)               /* bits_per_pixel */
                av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
            if (s->quant_precision != 5)
                av_log(s->avctx, AV_LOG_ERROR,
                       "quant precision %d\n", s->quant_precision);
2317
            if (s->quant_precision<3 || s->quant_precision>9) {
2318 2319
                s->quant_precision = 5;
            }
2320 2321 2322 2323 2324 2325
        } else {
            s->quant_precision = 5;
        }

        // FIXME a bunch of grayscale shape things

2326
        if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2327 2328
            int i, v;

2329
            mpeg4_load_default_matrices(s);
2330 2331

            /* load custom intra matrix */
2332 2333 2334
            if (get_bits1(gb)) {
                int last = 0;
                for (i = 0; i < 64; i++) {
2335
                    int j;
2336 2337 2338 2339
                    if (get_bits_left(gb) < 8) {
                        av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
                        return AVERROR_INVALIDDATA;
                    }
2340 2341 2342 2343 2344
                    v = get_bits(gb, 8);
                    if (v == 0)
                        break;

                    last = v;
2345
                    j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2346 2347
                    s->intra_matrix[j]        = last;
                    s->chroma_intra_matrix[j] = last;
2348 2349 2350
                }

                /* replicate last value */
2351
                for (; i < 64; i++) {
2352
                    int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2353 2354
                    s->intra_matrix[j]        = last;
                    s->chroma_intra_matrix[j] = last;
2355 2356 2357 2358
                }
            }

            /* load custom non intra matrix */
2359 2360 2361
            if (get_bits1(gb)) {
                int last = 0;
                for (i = 0; i < 64; i++) {
2362
                    int j;
2363 2364 2365 2366
                    if (get_bits_left(gb) < 8) {
                        av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
                        return AVERROR_INVALIDDATA;
                    }
2367 2368 2369 2370 2371
                    v = get_bits(gb, 8);
                    if (v == 0)
                        break;

                    last = v;
2372
                    j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2373 2374
                    s->inter_matrix[j]        = v;
                    s->chroma_inter_matrix[j] = v;
2375 2376 2377
                }

                /* replicate last value */
2378
                for (; i < 64; i++) {
2379
                    int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2380 2381
                    s->inter_matrix[j]        = last;
                    s->chroma_inter_matrix[j] = last;
2382 2383 2384 2385 2386 2387
                }
            }

            // FIXME a bunch of grayscale shape things
        }

2388 2389 2390 2391 2392
        if (vo_ver_id != 1)
            s->quarter_sample = get_bits1(gb);
        else
            s->quarter_sample = 0;

2393 2394 2395 2396 2397
        if (get_bits_left(gb) < 4) {
            av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
            return AVERROR_INVALIDDATA;
        }

2398 2399 2400 2401 2402
        if (!get_bits1(gb)) {
            int pos               = get_bits_count(gb);
            int estimation_method = get_bits(gb, 2);
            if (estimation_method < 2) {
                if (!get_bits1(gb)) {
2403 2404 2405 2406 2407
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* opaque */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* transparent */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* intra_cae */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* inter_cae */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* no_update */
2408
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* upsampling */
2409
                }
2410
                if (!get_bits1(gb)) {
2411 2412 2413 2414
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* intra_blocks */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* inter_blocks */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* inter4v_blocks */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* not coded blocks */
2415
                }
2416
                if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2417 2418 2419
                    skip_bits_long(gb, pos - get_bits_count(gb));
                    goto no_cplx_est;
                }
2420
                if (!get_bits1(gb)) {
2421 2422 2423 2424
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* dct_coeffs */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* dct_lines */
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* vlc_syms */
                    ctx->cplx_estimation_trash_i += 4 * get_bits1(gb);  /* vlc_bits */
2425
                }
2426
                if (!get_bits1(gb)) {
2427 2428 2429 2430 2431 2432
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* apm */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* npm */
                    ctx->cplx_estimation_trash_b += 8 * get_bits1(gb);  /* interpolate_mc_q */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* forwback_mc_q */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* halfpel2 */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* halfpel4 */
2433
                }
2434
                if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2435 2436 2437
                    skip_bits_long(gb, pos - get_bits_count(gb));
                    goto no_cplx_est;
                }
2438
                if (estimation_method == 1) {
2439 2440
                    ctx->cplx_estimation_trash_i += 8 * get_bits1(gb);  /* sadct */
                    ctx->cplx_estimation_trash_p += 8 * get_bits1(gb);  /* qpel */
2441
                }
2442 2443 2444 2445 2446 2447
            } else
                av_log(s->avctx, AV_LOG_ERROR,
                       "Invalid Complexity estimation method %d\n",
                       estimation_method);
        } else {

2448
no_cplx_est:
2449 2450 2451
            ctx->cplx_estimation_trash_i =
            ctx->cplx_estimation_trash_p =
            ctx->cplx_estimation_trash_b = 0;
2452 2453
        }

2454
        ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2455

2456 2457
        s->data_partitioning = get_bits1(gb);
        if (s->data_partitioning)
2458
            ctx->rvlc = get_bits1(gb);
2459

2460
        if (vo_ver_id != 1) {
2461 2462
            ctx->new_pred = get_bits1(gb);
            if (ctx->new_pred) {
2463 2464
                av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
                skip_bits(gb, 2); /* requested upstream message type */
2465
                skip_bits1(gb);   /* newpred segment type */
2466
            }
2467
            if (get_bits1(gb)) // reduced_res_vop
2468 2469 2470
                av_log(s->avctx, AV_LOG_ERROR,
                       "reduced resolution VOP not supported\n");
        } else {
2471
            ctx->new_pred = 0;
2472 2473
        }

2474
        ctx->scalability = get_bits1(gb);
2475

2476
        if (ctx->scalability) {
2477
            GetBitContext bak = *gb;
2478 2479 2480 2481 2482
            int h_sampling_factor_n;
            int h_sampling_factor_m;
            int v_sampling_factor_n;
            int v_sampling_factor_m;

2483
            skip_bits1(gb);    // hierarchy_type
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2484 2485
            skip_bits(gb, 4);  /* ref_layer_id */
            skip_bits1(gb);    /* ref_layer_sampling_dir */
2486 2487 2488 2489
            h_sampling_factor_n = get_bits(gb, 5);
            h_sampling_factor_m = get_bits(gb, 5);
            v_sampling_factor_n = get_bits(gb, 5);
            v_sampling_factor_m = get_bits(gb, 5);
2490
            ctx->enhancement_type = get_bits1(gb);
2491 2492 2493

            if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
                v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2494 2495
                /* illegal scalability header (VERY broken encoder),
                 * trying to workaround */
2496
                ctx->scalability = 0;
2497 2498
                *gb            = bak;
            } else
2499 2500 2501 2502 2503
                av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");

            // bin shape stuff FIXME
        }
    }
2504

2505
    if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2506
        av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d  %s%s%s%s\n",
2507
               s->avctx->framerate.den, s->avctx->framerate.num,
2508
               ctx->time_increment_bits,
2509 2510
               s->quant_precision,
               s->progressive_sequence,
2511
               s->low_delay,
2512
               ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2513
               s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2514 2515 2516
        );
    }

2517 2518 2519 2520
    return 0;
}

/**
2521
 * Decode the user data stuff in the header.
2522 2523
 * Also initializes divx/xvid/lavc_version/build.
 */
2524
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2525
{
2526
    MpegEncContext *s = &ctx->m;
2527 2528 2529 2530 2531 2532
    char buf[256];
    int i;
    int e;
    int ver = 0, build = 0, ver2 = 0, ver3 = 0;
    char last;

2533 2534 2535 2536
    for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
        if (show_bits(gb, 23) == 0)
            break;
        buf[i] = get_bits(gb, 8);
2537
    }
2538
    buf[i] = 0;
2539 2540

    /* divx detection */
2541 2542 2543 2544
    e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
    if (e < 2)
        e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
    if (e >= 2) {
2545 2546
        ctx->divx_version = ver;
        ctx->divx_build   = build;
2547
        s->divx_packed  = e == 3 && last == 'p';
2548 2549
    }

2550
    /* libavcodec detection */
2551 2552 2553 2554 2555
    e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
    if (e != 4)
        e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
    if (e != 4) {
        e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2556
        if (e > 1) {
2557
            if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2558 2559 2560 2561 2562 2563 2564
                av_log(s->avctx, AV_LOG_WARNING,
                     "Unknown Lavc version string encountered, %d.%d.%d; "
                     "clamping sub-version values to 8-bits.\n",
                     ver, ver2, ver3);
            }
            build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
        }
2565
    }
2566 2567
    if (e != 4) {
        if (strcmp(buf, "ffmpeg") == 0)
2568
            ctx->lavc_build = 4600;
2569
    }
2570
    if (e == 4)
2571
        ctx->lavc_build = build;
2572 2573

    /* Xvid detection */
2574 2575
    e = sscanf(buf, "XviD%d", &build);
    if (e == 1)
2576
        ctx->xvid_build = build;
2577 2578 2579 2580

    return 0;
}

2581 2582 2583 2584 2585
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
{
    Mpeg4DecContext *ctx = avctx->priv_data;
    MpegEncContext *s = &ctx->m;

2586
    if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2587
        if (s->codec_tag        == AV_RL32("XVID") ||
2588 2589 2590 2591
            s->codec_tag        == AV_RL32("XVIX") ||
            s->codec_tag        == AV_RL32("RMP4") ||
            s->codec_tag        == AV_RL32("ZMP4") ||
            s->codec_tag        == AV_RL32("SIPP"))
2592
            ctx->xvid_build = 0;
2593 2594
    }

2595
    if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2596
        if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2597
            ctx->vol_control_parameters == 0)
2598
            ctx->divx_version = 400;  // divx 4
2599

2600 2601 2602
    if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
        ctx->divx_version =
        ctx->divx_build   = -1;
2603 2604 2605 2606 2607 2608 2609 2610 2611
    }

    if (s->workaround_bugs & FF_BUG_AUTODETECT) {
        if (s->codec_tag == AV_RL32("XVIX"))
            s->workaround_bugs |= FF_BUG_XVID_ILACE;

        if (s->codec_tag == AV_RL32("UMP4"))
            s->workaround_bugs |= FF_BUG_UMP4;

2612
        if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2613 2614
            s->workaround_bugs |= FF_BUG_QPEL_CHROMA;

2615
        if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2616 2617
            s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;

2618
        if (ctx->xvid_build <= 3U)
2619 2620
            s->padding_bug_score = 256 * 256 * 256 * 64;

2621
        if (ctx->xvid_build <= 1U)
2622 2623
            s->workaround_bugs |= FF_BUG_QPEL_CHROMA;

2624
        if (ctx->xvid_build <= 12U)
2625 2626
            s->workaround_bugs |= FF_BUG_EDGE;

2627
        if (ctx->xvid_build <= 32U)
2628 2629 2630
            s->workaround_bugs |= FF_BUG_DC_CLIP;

#define SET_QPEL_FUNC(postfix1, postfix2)                           \
2631 2632 2633
    s->qdsp.put_        ## postfix1 = ff_put_        ## postfix2;   \
    s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;   \
    s->qdsp.avg_        ## postfix1 = ff_avg_        ## postfix2;
2634

2635
        if (ctx->lavc_build < 4653U)
2636 2637
            s->workaround_bugs |= FF_BUG_STD_QPEL;

2638
        if (ctx->lavc_build < 4655U)
2639 2640
            s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;

2641
        if (ctx->lavc_build < 4670U)
2642 2643
            s->workaround_bugs |= FF_BUG_EDGE;

2644
        if (ctx->lavc_build <= 4712U)
2645 2646
            s->workaround_bugs |= FF_BUG_DC_CLIP;

2647 2648 2649 2650 2651 2652 2653
        if ((ctx->lavc_build&0xFF) >= 100) {
            if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
               (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
            )
                s->workaround_bugs |= FF_BUG_IEDGE;
        }

2654
        if (ctx->divx_version >= 0)
2655
            s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2656
        if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2657 2658
            s->padding_bug_score = 256 * 256 * 256 * 64;

2659
        if (ctx->divx_version < 500U)
2660 2661
            s->workaround_bugs |= FF_BUG_EDGE;

2662
        if (ctx->divx_version >= 0)
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684
            s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
    }

    if (s->workaround_bugs & FF_BUG_STD_QPEL) {
        SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)

        SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
    }

    if (avctx->debug & FF_DEBUG_BUGS)
        av_log(s->avctx, AV_LOG_DEBUG,
               "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2685 2686
               s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
               ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2687

2688 2689
    if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
        s->codec_id == AV_CODEC_ID_MPEG4 &&
2690
        avctx->idct_algo == FF_IDCT_AUTO) {
2691
        avctx->idct_algo = FF_IDCT_XVID;
2692
        ff_mpv_idct_init(s);
2693 2694
        return 1;
    }
2695

2696 2697 2698
    return 0;
}

2699
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2700
{
2701
    MpegEncContext *s = &ctx->m;
2702
    int time_incr, time_increment;
2703
    int64_t pts;
2704

2705
    s->mcsel       = 0;
2706
    s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I;        /* pict type: I = 0 , P = 1 */
2707
    if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2708
        ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2709
        av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2710
        s->low_delay = 0;
2711 2712
    }

2713 2714 2715
    s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
    if (s->partitioned_frame)
        s->decode_mb = mpeg4_decode_partitioned_mb;
2716
    else
2717
        s->decode_mb = mpeg4_decode_mb;
2718

2719
    time_incr = 0;
2720 2721 2722
    while (get_bits1(gb) != 0)
        time_incr++;

2723
    check_marker(s->avctx, gb, "before time_increment");
2724

2725 2726
    if (ctx->time_increment_bits == 0 ||
        !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2727
        av_log(s->avctx, AV_LOG_WARNING,
2728
               "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2729

2730 2731 2732
        for (ctx->time_increment_bits = 1;
             ctx->time_increment_bits < 16;
             ctx->time_increment_bits++) {
2733 2734
            if (s->pict_type == AV_PICTURE_TYPE_P ||
                (s->pict_type == AV_PICTURE_TYPE_S &&
2735
                 ctx->vol_sprite_usage == GMC_SPRITE)) {
2736
                if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2737
                    break;
2738
            } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2739
                break;
2740 2741
        }

2742
        av_log(s->avctx, AV_LOG_WARNING,
2743
               "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2744 2745 2746
        if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
            s->avctx->framerate.num = 1<<ctx->time_increment_bits;
            s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2747
        }
2748 2749
    }

2750 2751 2752
    if (IS_3IV1)
        time_increment = get_bits1(gb);        // FIXME investigate further
    else
2753
        time_increment = get_bits(gb, ctx->time_increment_bits);
2754 2755 2756 2757

    if (s->pict_type != AV_PICTURE_TYPE_B) {
        s->last_time_base = s->time_base;
        s->time_base     += time_incr;
2758
        s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2759 2760
        if (s->workaround_bugs & FF_BUG_UMP4) {
            if (s->time < s->last_non_b_time) {
2761 2762 2763
                /* header is not mpeg-4-compatible, broken encoder,
                 * trying to workaround */
                s->time_base++;
2764
                s->time += s->avctx->framerate.num;
2765 2766
            }
        }
2767 2768 2769
        s->pp_time         = s->time - s->last_non_b_time;
        s->last_non_b_time = s->time;
    } else {
2770
        s->time    = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2771 2772 2773 2774
        s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
        if (s->pp_time <= s->pb_time ||
            s->pp_time <= s->pp_time - s->pb_time ||
            s->pp_time <= 0) {
2775
            /* messed up order, maybe after seeking? skipping current B-frame */
2776 2777 2778 2779
            return FRAME_SKIPPED;
        }
        ff_mpeg4_init_direct_mv(s);

2780 2781 2782 2783 2784 2785 2786 2787
        if (ctx->t_frame == 0)
            ctx->t_frame = s->pb_time;
        if (ctx->t_frame == 0)
            ctx->t_frame = 1;  // 1/0 protection
        s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
                            ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
        s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
                            ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2788 2789 2790 2791
        if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
            s->pb_field_time = 2;
            s->pp_field_time = 4;
            if (!s->progressive_sequence)
2792 2793 2794 2795
                return FRAME_SKIPPED;
        }
    }

2796 2797
    if (s->avctx->framerate.den)
        pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2798
    else
2799
        pts = AV_NOPTS_VALUE;
2800
    ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2801

2802
    check_marker(s->avctx, gb, "before vop_coded");
2803 2804

    /* vop coded */
2805 2806
    if (get_bits1(gb) != 1) {
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2807 2808 2809
            av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
        return FRAME_SKIPPED;
    }
2810
    if (ctx->new_pred)
2811
        decode_new_pred(ctx, gb);
2812

2813
    if (ctx->shape != BIN_ONLY_SHAPE &&
2814 2815
                    (s->pict_type == AV_PICTURE_TYPE_P ||
                     (s->pict_type == AV_PICTURE_TYPE_S &&
2816
                      ctx->vol_sprite_usage == GMC_SPRITE))) {
2817 2818 2819 2820 2821
        /* rounding type for motion estimation */
        s->no_rounding = get_bits1(gb);
    } else {
        s->no_rounding = 0;
    }
2822 2823
    // FIXME reduced res stuff

2824
    if (ctx->shape != RECT_SHAPE) {
2825
        if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2826
            skip_bits(gb, 13);  /* width */
2827
            check_marker(s->avctx, gb, "after width");
2828
            skip_bits(gb, 13);  /* height */
2829
            check_marker(s->avctx, gb, "after height");
2830
            skip_bits(gb, 13);  /* hor_spat_ref */
2831
            check_marker(s->avctx, gb, "after hor_spat_ref");
2832 2833 2834 2835 2836 2837 2838 2839 2840 2841
            skip_bits(gb, 13);  /* ver_spat_ref */
        }
        skip_bits1(gb);         /* change_CR_disable */

        if (get_bits1(gb) != 0)
            skip_bits(gb, 8);   /* constant_alpha_value */
    }

    // FIXME complexity estimation stuff

2842
    if (ctx->shape != BIN_ONLY_SHAPE) {
2843
        skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2844
        if (s->pict_type != AV_PICTURE_TYPE_I)
2845
            skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2846
        if (s->pict_type == AV_PICTURE_TYPE_B)
2847
            skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2848

2849 2850
        if (get_bits_left(gb) < 3) {
            av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2851
            return AVERROR_INVALIDDATA;
2852
        }
2853
        ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2854 2855 2856 2857 2858 2859 2860 2861
        if (!s->progressive_sequence) {
            s->top_field_first = get_bits1(gb);
            s->alternate_scan  = get_bits1(gb);
        } else
            s->alternate_scan = 0;
    }

    if (s->alternate_scan) {
2862 2863 2864 2865
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,   ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,   ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2866
    } else {
2867 2868 2869 2870
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,   ff_zigzag_direct);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,   ff_zigzag_direct);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2871 2872
    }

2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886
    if (s->pict_type == AV_PICTURE_TYPE_S) {
        if((ctx->vol_sprite_usage == STATIC_SPRITE ||
            ctx->vol_sprite_usage == GMC_SPRITE)) {
            if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
                return AVERROR_INVALIDDATA;
            if (ctx->sprite_brightness_change)
                av_log(s->avctx, AV_LOG_ERROR,
                    "sprite_brightness_change not supported\n");
            if (ctx->vol_sprite_usage == STATIC_SPRITE)
                av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
        } else {
            memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
            memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
        }
2887 2888
    }

2889
    if (ctx->shape != BIN_ONLY_SHAPE) {
2890 2891 2892
        s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
        if (s->qscale == 0) {
            av_log(s->avctx, AV_LOG_ERROR,
2893
                   "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2894
            return AVERROR_INVALIDDATA;  // makes no sense to continue, as there is nothing left from the image then
2895 2896 2897 2898 2899 2900
        }

        if (s->pict_type != AV_PICTURE_TYPE_I) {
            s->f_code = get_bits(gb, 3);        /* fcode_for */
            if (s->f_code == 0) {
                av_log(s->avctx, AV_LOG_ERROR,
2901
                       "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2902
                s->f_code = 1;
2903
                return AVERROR_INVALIDDATA;  // makes no sense to continue, as there is nothing left from the image then
2904 2905 2906 2907 2908 2909
            }
        } else
            s->f_code = 1;

        if (s->pict_type == AV_PICTURE_TYPE_B) {
            s->b_code = get_bits(gb, 3);
2910 2911 2912 2913
            if (s->b_code == 0) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "Error, header damaged or not MPEG4 header (b_code=0)\n");
                s->b_code=1;
2914
                return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2915
            }
2916 2917 2918 2919 2920
        } else
            s->b_code = 1;

        if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
            av_log(s->avctx, AV_LOG_DEBUG,
2921
                   "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
2922 2923
                   s->qscale, s->f_code, s->b_code,
                   s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
2924
                   gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2925
                   s->top_field_first, s->quarter_sample ? "q" : "h",
2926
                   s->data_partitioning, ctx->resync_marker,
2927
                   ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2928
                   1 - s->no_rounding, s->vo_type,
2929
                   ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2930
                   ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2931
                   ctx->cplx_estimation_trash_b,
2932 2933 2934
                   s->time,
                   time_increment
                  );
2935 2936
        }

2937
        if (!ctx->scalability) {
2938
            if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2939 2940
                skip_bits1(gb);  // vop shape coding type
        } else {
2941
            if (ctx->enhancement_type) {
2942 2943 2944 2945 2946 2947 2948 2949 2950
                int load_backward_shape = get_bits1(gb);
                if (load_backward_shape)
                    av_log(s->avctx, AV_LOG_ERROR,
                           "load backward shape isn't supported\n");
            }
            skip_bits(gb, 2);  // ref_select_code
        }
    }
    /* detect buggy encoders which don't set the low_delay flag
2951
     * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2952
     * easily (although it's buggy too) */
2953
    if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2954
        ctx->divx_version == -1 && s->picture_number == 0) {
2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970
        av_log(s->avctx, AV_LOG_WARNING,
               "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
        s->low_delay = 1;
    }

    s->picture_number++;  // better than pic number==0 always ;)

    // FIXME add short header support
    s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
    s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;

    if (s->workaround_bugs & FF_BUG_EDGE) {
        s->h_edge_pos = s->width;
        s->v_edge_pos = s->height;
    }
    return 0;
2971 2972
}

2973
static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2974 2975 2976 2977
{
    int i, j, v;

    if (get_bits1(gb)) {
2978 2979
        if (get_bits_left(gb) < 64*8)
            return AVERROR_INVALIDDATA;
2980 2981 2982 2983 2984 2985 2986 2987 2988 2989
        /* intra_quantiser_matrix */
        for (i = 0; i < 64; i++) {
            v = get_bits(gb, 8);
            j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
            s->intra_matrix[j]        = v;
            s->chroma_intra_matrix[j] = v;
        }
    }

    if (get_bits1(gb)) {
2990 2991
        if (get_bits_left(gb) < 64*8)
            return AVERROR_INVALIDDATA;
2992 2993 2994 2995 2996 2997 2998
        /* non_intra_quantiser_matrix */
        for (i = 0; i < 64; i++) {
            get_bits(gb, 8);
        }
    }

    if (get_bits1(gb)) {
2999 3000
        if (get_bits_left(gb) < 64*8)
            return AVERROR_INVALIDDATA;
3001 3002 3003 3004 3005 3006 3007 3008 3009
        /* chroma_intra_quantiser_matrix */
        for (i = 0; i < 64; i++) {
            v = get_bits(gb, 8);
            j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
            s->chroma_intra_matrix[j] = v;
        }
    }

    if (get_bits1(gb)) {
3010 3011
        if (get_bits_left(gb) < 64*8)
            return AVERROR_INVALIDDATA;
3012 3013 3014 3015 3016 3017 3018
        /* chroma_non_intra_quantiser_matrix */
        for (i = 0; i < 64; i++) {
            get_bits(gb, 8);
        }
    }

    next_start_code_studio(gb);
3019
    return 0;
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064
}

static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
{
    uint32_t startcode;
    uint8_t extension_type;

    startcode = show_bits_long(gb, 32);
    if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {

        if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
            skip_bits_long(gb, 32);
            extension_type = get_bits(gb, 4);
            if (extension_type == QUANT_MATRIX_EXT_ID)
                read_quant_matrix_ext(s, gb);
        }
    }
}

static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
{
    MpegEncContext *s = &ctx->m;

    skip_bits(gb, 16); /* Time_code[63..48] */
    check_marker(s->avctx, gb, "after Time_code[63..48]");
    skip_bits(gb, 16); /* Time_code[47..32] */
    check_marker(s->avctx, gb, "after Time_code[47..32]");
    skip_bits(gb, 16); /* Time_code[31..16] */
    check_marker(s->avctx, gb, "after Time_code[31..16]");
    skip_bits(gb, 16); /* Time_code[15..0] */
    check_marker(s->avctx, gb, "after Time_code[15..0]");
    skip_bits(gb, 4); /* reserved_bits */
}

/**
 * Decode the next studio vop header.
 * @return <0 if something went wrong
 */
static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
    MpegEncContext *s = &ctx->m;

    if (get_bits_left(gb) <= 32)
        return 0;

3065
    s->partitioned_frame = 0;
3066
    s->interlaced_dct = 0;
3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115
    s->decode_mb = mpeg4_decode_studio_mb;

    decode_smpte_tc(ctx, gb);

    skip_bits(gb, 10); /* temporal_reference */
    skip_bits(gb, 2); /* vop_structure */
    s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
    if (get_bits1(gb)) { /* vop_coded */
        skip_bits1(gb); /* top_field_first */
        skip_bits1(gb); /* repeat_first_field */
        s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
    }

    if (s->pict_type == AV_PICTURE_TYPE_I) {
        if (get_bits1(gb))
            reset_studio_dc_predictors(s);
    }

    if (ctx->shape != BIN_ONLY_SHAPE) {
        s->alternate_scan = get_bits1(gb);
        s->frame_pred_frame_dct = get_bits1(gb);
        s->dct_precision = get_bits(gb, 2);
        s->intra_dc_precision = get_bits(gb, 2);
        s->q_scale_type = get_bits1(gb);
    }

    if (s->alternate_scan) {
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,   ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,   ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
    } else {
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,   ff_zigzag_direct);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,   ff_zigzag_direct);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
    }

    mpeg4_load_default_matrices(s);

    next_start_code_studio(gb);
    extension_and_user_data(s, gb, 4);

    return 0;
}

static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
{
    MpegEncContext *s = &ctx->m;
3116
    int visual_object_type;
3117 3118 3119

        skip_bits(gb, 4); /* visual_object_verid */
        visual_object_type = get_bits(gb, 4);
3120 3121 3122 3123
        if (visual_object_type != VOT_VIDEO_ID) {
            avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
            return AVERROR_PATCHWELCOME;
        }
3124 3125 3126 3127

        next_start_code_studio(gb);
        extension_and_user_data(s, gb, 1);

3128 3129 3130 3131 3132 3133 3134
    return 0;
}

static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
    MpegEncContext *s = &ctx->m;
    int width, height;
3135
    int bits_per_raw_sample;
3136

3137 3138
            // random_accessible_vol and video_object_type_indication have already
            // been read by the caller decode_vol_header()
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150
            skip_bits(gb, 4); /* video_object_layer_verid */
            ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
            skip_bits(gb, 4); /* video_object_layer_shape_extension */
            skip_bits1(gb); /* progressive_sequence */
            if (ctx->shape != BIN_ONLY_SHAPE) {
                ctx->rgb = get_bits1(gb); /* rgb_components */
                s->chroma_format = get_bits(gb, 2); /* chroma_format */
                if (!s->chroma_format) {
                    av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
                    return AVERROR_INVALIDDATA;
                }

3151 3152
                bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
                if (bits_per_raw_sample == 10) {
3153 3154 3155 3156 3157 3158 3159 3160
                    if (ctx->rgb) {
                        s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
                    }
                    else {
                        s->avctx->pix_fmt = s->chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
                    }
                }
                else {
3161
                    avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3162 3163
                    return AVERROR_PATCHWELCOME;
                }
3164
                s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209
            }
            if (ctx->shape == RECT_SHAPE) {
                check_marker(s->avctx, gb, "before video_object_layer_width");
                width = get_bits(gb, 14); /* video_object_layer_width */
                check_marker(s->avctx, gb, "before video_object_layer_height");
                height = get_bits(gb, 14); /* video_object_layer_height */
                check_marker(s->avctx, gb, "after video_object_layer_height");

                /* Do the same check as non-studio profile */
                if (width && height) {
                    if (s->width && s->height &&
                        (s->width != width || s->height != height))
                        s->context_reinit = 1;
                    s->width  = width;
                    s->height = height;
                }
            }
            s->aspect_ratio_info = get_bits(gb, 4);
            if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
                s->avctx->sample_aspect_ratio.num = get_bits(gb, 8);  // par_width
                s->avctx->sample_aspect_ratio.den = get_bits(gb, 8);  // par_height
            } else {
                s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
            }
            skip_bits(gb, 4); /* frame_rate_code */
            skip_bits(gb, 15); /* first_half_bit_rate */
            check_marker(s->avctx, gb, "after first_half_bit_rate");
            skip_bits(gb, 15); /* latter_half_bit_rate */
            check_marker(s->avctx, gb, "after latter_half_bit_rate");
            skip_bits(gb, 15); /* first_half_vbv_buffer_size */
            check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
            skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
            skip_bits(gb, 11); /* first_half_vbv_buffer_size */
            check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
            skip_bits(gb, 15); /* latter_half_vbv_occupancy */
            check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
            s->low_delay = get_bits1(gb);
            s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */

            next_start_code_studio(gb);
            extension_and_user_data(s, gb, 2);

    return 0;
}

3210
/**
3211
 * Decode MPEG-4 headers.
3212 3213 3214
 *
 * @param  header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
 * @return <0 if an error occured
3215
 *         FRAME_SKIPPED if a not coded VOP is found
3216
 *         0 else
3217
 */
3218
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
3219
{
3220
    MpegEncContext *s = &ctx->m;
3221
    unsigned startcode, v;
3222
    int ret;
3223
    int vol = 0;
3224 3225 3226 3227

    /* search next start code */
    align_get_bits(gb);

3228 3229 3230 3231 3232 3233
    // If we have not switched to studio profile than we also did not switch bps
    // that means something else (like a previous instance) outside set bps which
    // would be inconsistant with the currect state, thus reset it
    if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
        s->avctx->bits_per_raw_sample = 0;

3234
    if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3235
        skip_bits(gb, 24);
3236
        if (get_bits(gb, 8) == 0xF0)
3237 3238 3239 3240
            goto end;
    }

    startcode = 0xff;
3241 3242 3243
    for (;;) {
        if (get_bits_count(gb) >= gb->size_in_bits) {
            if (gb->size_in_bits == 8 &&
3244
                (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3245
                av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3246
                return FRAME_SKIPPED;  // divx bug
3247 3248
            } else if (header && get_bits_count(gb) == gb->size_in_bits) {
                return 0; // ordinary return value for parsing of extradata
3249
            } else
3250
                return AVERROR_INVALIDDATA;  // end of stream
3251 3252 3253 3254 3255 3256
        }

        /* use the bits after the test */
        v = get_bits(gb, 8);
        startcode = ((startcode << 8) | v) & 0xffffffff;

3257 3258
        if ((startcode & 0xFFFFFF00) != 0x100)
            continue;  // no startcode
3259

3260
        if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3261
            av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315
            if (startcode <= 0x11F)
                av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
            else if (startcode <= 0x12F)
                av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
            else if (startcode <= 0x13F)
                av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
            else if (startcode <= 0x15F)
                av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
            else if (startcode <= 0x1AF)
                av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
            else if (startcode == 0x1B0)
                av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
            else if (startcode == 0x1B1)
                av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
            else if (startcode == 0x1B2)
                av_log(s->avctx, AV_LOG_DEBUG, "User Data");
            else if (startcode == 0x1B3)
                av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
            else if (startcode == 0x1B4)
                av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
            else if (startcode == 0x1B5)
                av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
            else if (startcode == 0x1B6)
                av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
            else if (startcode == 0x1B7)
                av_log(s->avctx, AV_LOG_DEBUG, "slice start");
            else if (startcode == 0x1B8)
                av_log(s->avctx, AV_LOG_DEBUG, "extension start");
            else if (startcode == 0x1B9)
                av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
            else if (startcode == 0x1BA)
                av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
            else if (startcode == 0x1BB)
                av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
            else if (startcode == 0x1BC)
                av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
            else if (startcode == 0x1BD)
                av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
            else if (startcode == 0x1BE)
                av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
            else if (startcode == 0x1BF)
                av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
            else if (startcode == 0x1C0)
                av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
            else if (startcode == 0x1C1)
                av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
            else if (startcode == 0x1C2)
                av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
            else if (startcode == 0x1C3)
                av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
            else if (startcode <= 0x1C5)
                av_log(s->avctx, AV_LOG_DEBUG, "reserved");
            else if (startcode <= 0x1FF)
                av_log(s->avctx, AV_LOG_DEBUG, "System start");
3316 3317 3318
            av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
        }

3319
        if (startcode >= 0x120 && startcode <= 0x12F) {
3320
            if (vol) {
3321 3322
                av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
                continue;
3323 3324
            }
            vol++;
3325 3326
            if ((ret = decode_vol_header(ctx, gb)) < 0)
                return ret;
3327
        } else if (startcode == USER_DATA_STARTCODE) {
3328
            decode_user_data(ctx, gb);
3329
        } else if (startcode == GOP_STARTCODE) {
3330
            mpeg4_decode_gop_header(s, gb);
3331
        } else if (startcode == VOS_STARTCODE) {
3332 3333 3334 3335
            int profile, level;
            mpeg4_decode_profile_level(s, gb, &profile, &level);
            if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
                (level > 0 && level < 9)) {
3336 3337 3338
                s->studio_profile = 1;
                next_start_code_studio(gb);
                extension_and_user_data(s, gb, 0);
3339 3340 3341
            } else if (s->studio_profile) {
                avpriv_request_sample(s->avctx, "Mixes studio and non studio profile\n");
                return AVERROR_PATCHWELCOME;
3342
            }
3343 3344
            s->avctx->profile = profile;
            s->avctx->level   = level;
3345 3346
        } else if (startcode == VISUAL_OBJ_STARTCODE) {
            if (s->studio_profile) {
3347 3348
                if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
                    return ret;
3349 3350
            } else
                mpeg4_decode_visual_object(s, gb);
3351
        } else if (startcode == VOP_STARTCODE) {
3352 3353 3354 3355 3356 3357
            break;
        }

        align_get_bits(gb);
        startcode = 0xff;
    }
3358

3359
end:
3360
    if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3361 3362 3363
        s->low_delay = 1;
    s->avctx->has_b_frames = !s->low_delay;

3364 3365 3366 3367 3368
    if (s->studio_profile) {
        if (!s->avctx->bits_per_raw_sample) {
            av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
            return AVERROR_INVALIDDATA;
        }
3369
        return decode_studio_vop_header(ctx, gb);
3370
    } else
3371
        return decode_vop_header(ctx, gb);
3372 3373
}

3374
av_cold void ff_mpeg4videodec_static_init(void) {
3375 3376 3377
    static int done = 0;

    if (!done) {
3378 3379 3380
        ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
        ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
        ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
3381
        INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
3382 3383
        INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
        INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
3384
        INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3385 3386
                        &ff_mpeg4_DCtab_lum[0][1], 2, 1,
                        &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3387
        INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3388 3389
                        &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
                        &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3390
        INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3391 3392
                        &ff_sprite_trajectory_tab[0][1], 4, 2,
                        &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
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        INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
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                        &ff_mb_type_b_tab[0][1], 2, 1,
                        &ff_mb_type_b_tab[0][0], 2, 1, 16);
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        done = 1;
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    }
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}

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int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
    Mpeg4DecContext *ctx = avctx->priv_data;
    MpegEncContext    *s = &ctx->m;

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    /* divx 5.01+ bitstream reorder stuff */
    /* Since this clobbers the input buffer and hwaccel codecs still need the
     * data during hwaccel->end_frame we should not do this any earlier */
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    if (s->divx_packed) {
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        int current_pos     = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
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        int startcode_found = 0;

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        if (buf_size - current_pos > 7) {

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            int i;
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            for (i = current_pos; i < buf_size - 4; i++)

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                if (buf[i]     == 0 &&
                    buf[i + 1] == 0 &&
                    buf[i + 2] == 1 &&
                    buf[i + 3] == 0xB6) {
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                    startcode_found = !(buf[i + 4] & 0x40);
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                    break;
                }
        }

        if (startcode_found) {
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            if (!ctx->showed_packed_warning) {
                av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
                       "wasteful way to store B-frames ('packed B-frames'). "
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                       "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
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                ctx->showed_packed_warning = 1;
            }
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            av_fast_padded_malloc(&s->bitstream_buffer,
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                           &s->allocated_bitstream_buffer_size,
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                           buf_size - current_pos);
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            if (!s->bitstream_buffer) {
                s->bitstream_buffer_size = 0;
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                return AVERROR(ENOMEM);
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            }
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            memcpy(s->bitstream_buffer, buf + current_pos,
                   buf_size - current_pos);
            s->bitstream_buffer_size = buf_size - current_pos;
        }
    }

    return 0;
}

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#if HAVE_THREADS
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static int mpeg4_update_thread_context(AVCodecContext *dst,
                                       const AVCodecContext *src)
{
    Mpeg4DecContext *s = dst->priv_data;
    const Mpeg4DecContext *s1 = src->priv_data;
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    int init = s->m.context_initialized;
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    int ret = ff_mpeg_update_thread_context(dst, src);

    if (ret < 0)
        return ret;

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    memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
3463

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    if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
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        ff_xvid_idct_init(&s->m.idsp, dst);
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    return 0;
}
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#endif
3470

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static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
{
    int i, ret;

    for (i = 0; i < 12; i++) {
        ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
                       &ff_mpeg4_studio_intra[i][0][1], 4, 2,
                       &ff_mpeg4_studio_intra[i][0][0], 4, 2,
                       0);

        if (ret < 0)
            return ret;
    }

    ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
                   &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
                   &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
                   0);
    if (ret < 0)
        return ret;

    ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
                   &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
                   &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
                   0);
    if (ret < 0)
        return ret;

    return 0;
}

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static av_cold int decode_init(AVCodecContext *avctx)
{
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    Mpeg4DecContext *ctx = avctx->priv_data;
    MpegEncContext *s = &ctx->m;
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    int ret;

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    ctx->divx_version =
    ctx->divx_build   =
    ctx->xvid_build   =
    ctx->lavc_build   = -1;
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    if ((ret = ff_h263_decode_init(avctx)) < 0)
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        return ret;

    ff_mpeg4videodec_static_init();
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    if ((ret = init_studio_vlcs(ctx)) < 0)
        return ret;
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    s->h263_pred = 1;
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    s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
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    s->decode_mb = mpeg4_decode_mb;
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    ctx->time_increment_bits = 4; /* default value for broken headers */
3524

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    avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
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    avctx->internal->allocate_progress = 1;

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    return 0;
}

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static av_cold int decode_end(AVCodecContext *avctx)
{
    Mpeg4DecContext *ctx = avctx->priv_data;
    int i;

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    if (!avctx->internal->is_copy) {
        for (i = 0; i < 12; i++)
            ff_free_vlc(&ctx->studio_intra_tab[i]);
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        ff_free_vlc(&ctx->studio_luma_dc);
        ff_free_vlc(&ctx->studio_chroma_dc);
    }
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    return ff_h263_decode_end(avctx);
}

3547
static const AVOption mpeg4_options[] = {
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    {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
    {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
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    {NULL}
};

static const AVClass mpeg4_class = {
James Almer's avatar
James Almer committed
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    .class_name = "MPEG4 Video Decoder",
    .item_name  = av_default_item_name,
    .option     = mpeg4_options,
    .version    = LIBAVUTIL_VERSION_INT,
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};

3560
AVCodec ff_mpeg4_decoder = {
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    .name                  = "mpeg4",
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    .long_name             = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
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    .type                  = AVMEDIA_TYPE_VIDEO,
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    .id                    = AV_CODEC_ID_MPEG4,
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    .priv_data_size        = sizeof(Mpeg4DecContext),
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    .init                  = decode_init,
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    .close                 = decode_end,
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    .decode                = ff_h263_decode_frame,
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    .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
                             AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
                             AV_CODEC_CAP_FRAME_THREADS,
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    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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    .flush                 = ff_mpeg_flush,
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    .max_lowres            = 3,
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    .pix_fmts              = ff_h263_hwaccel_pixfmt_list_420,
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    .profiles              = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
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    .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
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    .priv_class = &mpeg4_class,
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    .hw_configs            = (const AVCodecHWConfigInternal*[]) {
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#if CONFIG_MPEG4_NVDEC_HWACCEL
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                               HWACCEL_NVDEC(mpeg4),
#endif
#if CONFIG_MPEG4_VAAPI_HWACCEL
                               HWACCEL_VAAPI(mpeg4),
#endif
#if CONFIG_MPEG4_VDPAU_HWACCEL
                               HWACCEL_VDPAU(mpeg4),
#endif
#if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
                               HWACCEL_VIDEOTOOLBOX(mpeg4),
#endif
                               NULL
                           },
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};