h264_slice.c 82.6 KB
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/*
 * H.26L/H.264/AVC/JVT/14496-10/... decoder
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.264 / AVC / MPEG4 part10 codec.
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/timer.h"
#include "internal.h"
#include "cabac.h"
#include "cabac_functions.h"
#include "error_resilience.h"
#include "avcodec.h"
#include "h264.h"
#include "h264data.h"
#include "h264chroma.h"
#include "h264_mvpred.h"
#include "golomb.h"
#include "mathops.h"
#include "mpegutils.h"
#include "rectangle.h"
#include "thread.h"


static const uint8_t rem6[QP_MAX_NUM + 1] = {
    0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
    3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
    0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3,
};

static const uint8_t div6[QP_MAX_NUM + 1] = {
    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3,  3,  3,
    3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6,  6,  6,
    7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10,
};

static const uint8_t field_scan[16] = {
    0 + 0 * 4, 0 + 1 * 4, 1 + 0 * 4, 0 + 2 * 4,
    0 + 3 * 4, 1 + 1 * 4, 1 + 2 * 4, 1 + 3 * 4,
    2 + 0 * 4, 2 + 1 * 4, 2 + 2 * 4, 2 + 3 * 4,
    3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4, 3 + 3 * 4,
};

static const uint8_t field_scan8x8[64] = {
    0 + 0 * 8, 0 + 1 * 8, 0 + 2 * 8, 1 + 0 * 8,
    1 + 1 * 8, 0 + 3 * 8, 0 + 4 * 8, 1 + 2 * 8,
    2 + 0 * 8, 1 + 3 * 8, 0 + 5 * 8, 0 + 6 * 8,
    0 + 7 * 8, 1 + 4 * 8, 2 + 1 * 8, 3 + 0 * 8,
    2 + 2 * 8, 1 + 5 * 8, 1 + 6 * 8, 1 + 7 * 8,
    2 + 3 * 8, 3 + 1 * 8, 4 + 0 * 8, 3 + 2 * 8,
    2 + 4 * 8, 2 + 5 * 8, 2 + 6 * 8, 2 + 7 * 8,
    3 + 3 * 8, 4 + 1 * 8, 5 + 0 * 8, 4 + 2 * 8,
    3 + 4 * 8, 3 + 5 * 8, 3 + 6 * 8, 3 + 7 * 8,
    4 + 3 * 8, 5 + 1 * 8, 6 + 0 * 8, 5 + 2 * 8,
    4 + 4 * 8, 4 + 5 * 8, 4 + 6 * 8, 4 + 7 * 8,
    5 + 3 * 8, 6 + 1 * 8, 6 + 2 * 8, 5 + 4 * 8,
    5 + 5 * 8, 5 + 6 * 8, 5 + 7 * 8, 6 + 3 * 8,
    7 + 0 * 8, 7 + 1 * 8, 6 + 4 * 8, 6 + 5 * 8,
    6 + 6 * 8, 6 + 7 * 8, 7 + 2 * 8, 7 + 3 * 8,
    7 + 4 * 8, 7 + 5 * 8, 7 + 6 * 8, 7 + 7 * 8,
};

static const uint8_t field_scan8x8_cavlc[64] = {
    0 + 0 * 8, 1 + 1 * 8, 2 + 0 * 8, 0 + 7 * 8,
    2 + 2 * 8, 2 + 3 * 8, 2 + 4 * 8, 3 + 3 * 8,
    3 + 4 * 8, 4 + 3 * 8, 4 + 4 * 8, 5 + 3 * 8,
    5 + 5 * 8, 7 + 0 * 8, 6 + 6 * 8, 7 + 4 * 8,
    0 + 1 * 8, 0 + 3 * 8, 1 + 3 * 8, 1 + 4 * 8,
    1 + 5 * 8, 3 + 1 * 8, 2 + 5 * 8, 4 + 1 * 8,
    3 + 5 * 8, 5 + 1 * 8, 4 + 5 * 8, 6 + 1 * 8,
    5 + 6 * 8, 7 + 1 * 8, 6 + 7 * 8, 7 + 5 * 8,
    0 + 2 * 8, 0 + 4 * 8, 0 + 5 * 8, 2 + 1 * 8,
    1 + 6 * 8, 4 + 0 * 8, 2 + 6 * 8, 5 + 0 * 8,
    3 + 6 * 8, 6 + 0 * 8, 4 + 6 * 8, 6 + 2 * 8,
    5 + 7 * 8, 6 + 4 * 8, 7 + 2 * 8, 7 + 6 * 8,
    1 + 0 * 8, 1 + 2 * 8, 0 + 6 * 8, 3 + 0 * 8,
    1 + 7 * 8, 3 + 2 * 8, 2 + 7 * 8, 4 + 2 * 8,
    3 + 7 * 8, 5 + 2 * 8, 4 + 7 * 8, 5 + 4 * 8,
    6 + 3 * 8, 6 + 5 * 8, 7 + 3 * 8, 7 + 7 * 8,
};

// zigzag_scan8x8_cavlc[i] = zigzag_scan8x8[(i/4) + 16*(i%4)]
static const uint8_t zigzag_scan8x8_cavlc[64] = {
    0 + 0 * 8, 1 + 1 * 8, 1 + 2 * 8, 2 + 2 * 8,
    4 + 1 * 8, 0 + 5 * 8, 3 + 3 * 8, 7 + 0 * 8,
    3 + 4 * 8, 1 + 7 * 8, 5 + 3 * 8, 6 + 3 * 8,
    2 + 7 * 8, 6 + 4 * 8, 5 + 6 * 8, 7 + 5 * 8,
    1 + 0 * 8, 2 + 0 * 8, 0 + 3 * 8, 3 + 1 * 8,
    3 + 2 * 8, 0 + 6 * 8, 4 + 2 * 8, 6 + 1 * 8,
    2 + 5 * 8, 2 + 6 * 8, 6 + 2 * 8, 5 + 4 * 8,
    3 + 7 * 8, 7 + 3 * 8, 4 + 7 * 8, 7 + 6 * 8,
    0 + 1 * 8, 3 + 0 * 8, 0 + 4 * 8, 4 + 0 * 8,
    2 + 3 * 8, 1 + 5 * 8, 5 + 1 * 8, 5 + 2 * 8,
    1 + 6 * 8, 3 + 5 * 8, 7 + 1 * 8, 4 + 5 * 8,
    4 + 6 * 8, 7 + 4 * 8, 5 + 7 * 8, 6 + 7 * 8,
    0 + 2 * 8, 2 + 1 * 8, 1 + 3 * 8, 5 + 0 * 8,
    1 + 4 * 8, 2 + 4 * 8, 6 + 0 * 8, 4 + 3 * 8,
    0 + 7 * 8, 4 + 4 * 8, 7 + 2 * 8, 3 + 6 * 8,
    5 + 5 * 8, 6 + 5 * 8, 6 + 6 * 8, 7 + 7 * 8,
};

static const uint8_t dequant4_coeff_init[6][3] = {
    { 10, 13, 16 },
    { 11, 14, 18 },
    { 13, 16, 20 },
    { 14, 18, 23 },
    { 16, 20, 25 },
    { 18, 23, 29 },
};

static const uint8_t dequant8_coeff_init_scan[16] = {
    0, 3, 4, 3, 3, 1, 5, 1, 4, 5, 2, 5, 3, 1, 5, 1
};

static const uint8_t dequant8_coeff_init[6][6] = {
    { 20, 18, 32, 19, 25, 24 },
    { 22, 19, 35, 21, 28, 26 },
    { 26, 23, 42, 24, 33, 31 },
    { 28, 25, 45, 26, 35, 33 },
    { 32, 28, 51, 30, 40, 38 },
    { 36, 32, 58, 34, 46, 43 },
};


static void release_unused_pictures(H264Context *h, int remove_current)
{
    int i;

    /* release non reference frames */
    for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
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        if (h->DPB[i].f->buf[0] && !h->DPB[i].reference &&
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            (remove_current || &h->DPB[i] != h->cur_pic_ptr)) {
            ff_h264_unref_picture(h, &h->DPB[i]);
        }
    }
}

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static int alloc_scratch_buffers(H264SliceContext *sl, int linesize)
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{
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    const H264Context *h = sl->h264;
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    int alloc_size = FFALIGN(FFABS(linesize) + 32, 32);

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    av_fast_malloc(&sl->bipred_scratchpad, &sl->bipred_scratchpad_allocated, 16 * 6 * alloc_size);
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    // edge emu needs blocksize + filter length - 1
    // (= 21x21 for  h264)
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    av_fast_malloc(&sl->edge_emu_buffer, &sl->edge_emu_buffer_allocated, alloc_size * 2 * 21);
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    av_fast_malloc(&sl->top_borders[0], &sl->top_borders_allocated[0],
                   h->mb_width * 16 * 3 * sizeof(uint8_t) * 2);
    av_fast_malloc(&sl->top_borders[1], &sl->top_borders_allocated[1],
                   h->mb_width * 16 * 3 * sizeof(uint8_t) * 2);

    if (!sl->bipred_scratchpad || !sl->edge_emu_buffer ||
        !sl->top_borders[0]    || !sl->top_borders[1]) {
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        av_freep(&sl->bipred_scratchpad);
        av_freep(&sl->edge_emu_buffer);
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        av_freep(&sl->top_borders[0]);
        av_freep(&sl->top_borders[1]);

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        sl->bipred_scratchpad_allocated = 0;
        sl->edge_emu_buffer_allocated   = 0;
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        sl->top_borders_allocated[0]    = 0;
        sl->top_borders_allocated[1]    = 0;
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        return AVERROR(ENOMEM);
    }

    return 0;
}

static int init_table_pools(H264Context *h)
{
    const int big_mb_num    = h->mb_stride * (h->mb_height + 1) + 1;
    const int mb_array_size = h->mb_stride * h->mb_height;
    const int b4_stride     = h->mb_width * 4 + 1;
    const int b4_array_size = b4_stride * h->mb_height * 4;

    h->qscale_table_pool = av_buffer_pool_init(big_mb_num + h->mb_stride,
                                               av_buffer_allocz);
    h->mb_type_pool      = av_buffer_pool_init((big_mb_num + h->mb_stride) *
                                               sizeof(uint32_t), av_buffer_allocz);
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    h->motion_val_pool   = av_buffer_pool_init(2 * (b4_array_size + 4) *
                                               sizeof(int16_t), av_buffer_allocz);
    h->ref_index_pool    = av_buffer_pool_init(4 * mb_array_size, av_buffer_allocz);
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    if (!h->qscale_table_pool || !h->mb_type_pool || !h->motion_val_pool ||
        !h->ref_index_pool) {
        av_buffer_pool_uninit(&h->qscale_table_pool);
        av_buffer_pool_uninit(&h->mb_type_pool);
        av_buffer_pool_uninit(&h->motion_val_pool);
        av_buffer_pool_uninit(&h->ref_index_pool);
        return AVERROR(ENOMEM);
    }

    return 0;
}

static int alloc_picture(H264Context *h, H264Picture *pic)
{
    int i, ret = 0;

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    av_assert0(!pic->f->data[0]);
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    pic->tf.f = pic->f;
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    ret = ff_thread_get_buffer(h->avctx, &pic->tf, pic->reference ?
                                                   AV_GET_BUFFER_FLAG_REF : 0);
    if (ret < 0)
        goto fail;

    if (h->avctx->hwaccel) {
        const AVHWAccel *hwaccel = h->avctx->hwaccel;
        av_assert0(!pic->hwaccel_picture_private);
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        if (hwaccel->frame_priv_data_size) {
            pic->hwaccel_priv_buf = av_buffer_allocz(hwaccel->frame_priv_data_size);
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            if (!pic->hwaccel_priv_buf)
                return AVERROR(ENOMEM);
            pic->hwaccel_picture_private = pic->hwaccel_priv_buf->data;
        }
    }

    if (!h->qscale_table_pool) {
        ret = init_table_pools(h);
        if (ret < 0)
            goto fail;
    }

    pic->qscale_table_buf = av_buffer_pool_get(h->qscale_table_pool);
    pic->mb_type_buf      = av_buffer_pool_get(h->mb_type_pool);
    if (!pic->qscale_table_buf || !pic->mb_type_buf)
        goto fail;

    pic->mb_type      = (uint32_t*)pic->mb_type_buf->data + 2 * h->mb_stride + 1;
    pic->qscale_table = pic->qscale_table_buf->data + 2 * h->mb_stride + 1;

    for (i = 0; i < 2; i++) {
        pic->motion_val_buf[i] = av_buffer_pool_get(h->motion_val_pool);
        pic->ref_index_buf[i]  = av_buffer_pool_get(h->ref_index_pool);
        if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i])
            goto fail;

        pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;
        pic->ref_index[i]  = pic->ref_index_buf[i]->data;
    }

    return 0;
fail:
    ff_h264_unref_picture(h, pic);
    return (ret < 0) ? ret : AVERROR(ENOMEM);
}

static inline int pic_is_unused(H264Context *h, H264Picture *pic)
{
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    if (!pic->f->buf[0])
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        return 1;
    return 0;
}

static int find_unused_picture(H264Context *h)
{
    int i;

    for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
        if (pic_is_unused(h, &h->DPB[i]))
            break;
    }
    if (i == H264_MAX_PICTURE_COUNT)
        return AVERROR_INVALIDDATA;

    return i;
}


static void init_dequant8_coeff_table(H264Context *h)
{
    int i, j, q, x;
    const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);

    for (i = 0; i < 6; i++) {
        h->dequant8_coeff[i] = h->dequant8_buffer[i];
        for (j = 0; j < i; j++)
            if (!memcmp(h->pps.scaling_matrix8[j], h->pps.scaling_matrix8[i],
                        64 * sizeof(uint8_t))) {
                h->dequant8_coeff[i] = h->dequant8_buffer[j];
                break;
            }
        if (j < i)
            continue;

        for (q = 0; q < max_qp + 1; q++) {
            int shift = div6[q];
            int idx   = rem6[q];
            for (x = 0; x < 64; x++)
                h->dequant8_coeff[i][q][(x >> 3) | ((x & 7) << 3)] =
                    ((uint32_t)dequant8_coeff_init[idx][dequant8_coeff_init_scan[((x >> 1) & 12) | (x & 3)]] *
                     h->pps.scaling_matrix8[i][x]) << shift;
        }
    }
}

static void init_dequant4_coeff_table(H264Context *h)
{
    int i, j, q, x;
    const int max_qp = 51 + 6 * (h->sps.bit_depth_luma - 8);
    for (i = 0; i < 6; i++) {
        h->dequant4_coeff[i] = h->dequant4_buffer[i];
        for (j = 0; j < i; j++)
            if (!memcmp(h->pps.scaling_matrix4[j], h->pps.scaling_matrix4[i],
                        16 * sizeof(uint8_t))) {
                h->dequant4_coeff[i] = h->dequant4_buffer[j];
                break;
            }
        if (j < i)
            continue;

        for (q = 0; q < max_qp + 1; q++) {
            int shift = div6[q] + 2;
            int idx   = rem6[q];
            for (x = 0; x < 16; x++)
                h->dequant4_coeff[i][q][(x >> 2) | ((x << 2) & 0xF)] =
                    ((uint32_t)dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] *
                     h->pps.scaling_matrix4[i][x]) << shift;
        }
    }
}

void h264_init_dequant_tables(H264Context *h)
{
    int i, x;
    init_dequant4_coeff_table(h);
    if (h->pps.transform_8x8_mode)
        init_dequant8_coeff_table(h);
    if (h->sps.transform_bypass) {
        for (i = 0; i < 6; i++)
            for (x = 0; x < 16; x++)
                h->dequant4_coeff[i][0][x] = 1 << 6;
        if (h->pps.transform_8x8_mode)
            for (i = 0; i < 6; i++)
                for (x = 0; x < 64; x++)
                    h->dequant8_coeff[i][0][x] = 1 << 6;
    }
}

#define IN_RANGE(a, b, size) (((a) >= (b)) && ((a) < ((b) + (size))))
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#define REBASE_PICTURE(pic, new_ctx, old_ctx)             \
    ((pic && pic >= old_ctx->DPB &&                       \
      pic < old_ctx->DPB + H264_MAX_PICTURE_COUNT) ?          \
     &new_ctx->DPB[pic - old_ctx->DPB] : NULL)

static void copy_picture_range(H264Picture **to, H264Picture **from, int count,
                               H264Context *new_base,
                               H264Context *old_base)
{
    int i;

    for (i = 0; i < count; i++) {
        assert((IN_RANGE(from[i], old_base, sizeof(*old_base)) ||
                IN_RANGE(from[i], old_base->DPB,
                         sizeof(H264Picture) * H264_MAX_PICTURE_COUNT) ||
                !from[i]));
        to[i] = REBASE_PICTURE(from[i], new_base, old_base);
    }
}

static int copy_parameter_set(void **to, void **from, int count, int size)
{
    int i;

    for (i = 0; i < count; i++) {
        if (to[i] && !from[i]) {
            av_freep(&to[i]);
        } else if (from[i] && !to[i]) {
            to[i] = av_malloc(size);
            if (!to[i])
                return AVERROR(ENOMEM);
        }

        if (from[i])
            memcpy(to[i], from[i], size);
    }

    return 0;
}

#define copy_fields(to, from, start_field, end_field)                   \
    memcpy(&to->start_field, &from->start_field,                        \
           (char *)&to->end_field - (char *)&to->start_field)

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static int h264_slice_header_init(H264Context *h);
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int ff_h264_update_thread_context(AVCodecContext *dst,
                                  const AVCodecContext *src)
{
    H264Context *h = dst->priv_data, *h1 = src->priv_data;
    int inited = h->context_initialized, err = 0;
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    int need_reinit = 0;
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    int i, ret;

    if (dst == src || !h1->context_initialized)
        return 0;

    if (inited &&
        (h->width                 != h1->width                 ||
         h->height                != h1->height                ||
         h->mb_width              != h1->mb_width              ||
         h->mb_height             != h1->mb_height             ||
         h->sps.bit_depth_luma    != h1->sps.bit_depth_luma    ||
         h->sps.chroma_format_idc != h1->sps.chroma_format_idc ||
         h->sps.colorspace        != h1->sps.colorspace)) {
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        need_reinit = 1;
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    }

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    // SPS/PPS
    if ((ret = copy_parameter_set((void **)h->sps_buffers,
                                  (void **)h1->sps_buffers,
                                  MAX_SPS_COUNT, sizeof(SPS))) < 0)
        return ret;
    h->sps = h1->sps;
    if ((ret = copy_parameter_set((void **)h->pps_buffers,
                                  (void **)h1->pps_buffers,
                                  MAX_PPS_COUNT, sizeof(PPS))) < 0)
        return ret;
    h->pps = h1->pps;

    if (need_reinit || !inited) {
        h->width     = h1->width;
        h->height    = h1->height;
        h->mb_height = h1->mb_height;
        h->mb_width  = h1->mb_width;
        h->mb_num    = h1->mb_num;
        h->mb_stride = h1->mb_stride;
        h->b_stride  = h1->b_stride;

        if ((err = h264_slice_header_init(h)) < 0) {
            av_log(h->avctx, AV_LOG_ERROR, "h264_slice_header_init() failed");
            return err;
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        }

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        /* copy block_offset since frame_start may not be called */
        memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));
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    }

    h->avctx->coded_height  = h1->avctx->coded_height;
    h->avctx->coded_width   = h1->avctx->coded_width;
    h->avctx->width         = h1->avctx->width;
    h->avctx->height        = h1->avctx->height;
    h->coded_picture_number = h1->coded_picture_number;
    h->first_field          = h1->first_field;
    h->picture_structure    = h1->picture_structure;
    h->droppable            = h1->droppable;
    h->low_delay            = h1->low_delay;

    for (i = 0; i < H264_MAX_PICTURE_COUNT; i++) {
        ff_h264_unref_picture(h, &h->DPB[i]);
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        if (h1->DPB[i].f->buf[0] &&
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            (ret = ff_h264_ref_picture(h, &h->DPB[i], &h1->DPB[i])) < 0)
            return ret;
    }

    h->cur_pic_ptr = REBASE_PICTURE(h1->cur_pic_ptr, h, h1);
    ff_h264_unref_picture(h, &h->cur_pic);
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    if (h1->cur_pic.f->buf[0]) {
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        ret = ff_h264_ref_picture(h, &h->cur_pic, &h1->cur_pic);
        if (ret < 0)
            return ret;
    }
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    h->enable_er       = h1->enable_er;
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    h->workaround_bugs = h1->workaround_bugs;
    h->low_delay       = h1->low_delay;
    h->droppable       = h1->droppable;

    // extradata/NAL handling
    h->is_avc = h1->is_avc;
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    h->nal_length_size = h1->nal_length_size;
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    // Dequantization matrices
    // FIXME these are big - can they be only copied when PPS changes?
    copy_fields(h, h1, dequant4_buffer, dequant4_coeff);

    for (i = 0; i < 6; i++)
        h->dequant4_coeff[i] = h->dequant4_buffer[0] +
                               (h1->dequant4_coeff[i] - h1->dequant4_buffer[0]);

    for (i = 0; i < 6; i++)
        h->dequant8_coeff[i] = h->dequant8_buffer[0] +
                               (h1->dequant8_coeff[i] - h1->dequant8_buffer[0]);

    h->dequant_coeff_pps = h1->dequant_coeff_pps;

    // POC timing
513
    copy_fields(h, h1, poc_lsb, default_ref_list);
514 515

    // reference lists
516
    copy_fields(h, h1, short_ref, current_slice);
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558

    copy_picture_range(h->short_ref, h1->short_ref, 32, h, h1);
    copy_picture_range(h->long_ref, h1->long_ref, 32, h, h1);
    copy_picture_range(h->delayed_pic, h1->delayed_pic,
                       MAX_DELAYED_PIC_COUNT + 2, h, h1);

    h->last_slice_type = h1->last_slice_type;

    if (!h->cur_pic_ptr)
        return 0;

    if (!h->droppable) {
        err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
        h->prev_poc_msb = h->poc_msb;
        h->prev_poc_lsb = h->poc_lsb;
    }
    h->prev_frame_num_offset = h->frame_num_offset;
    h->prev_frame_num        = h->frame_num;

    h->recovery_frame        = h1->recovery_frame;
    h->frame_recovered       = h1->frame_recovered;

    return err;
}

static int h264_frame_start(H264Context *h)
{
    H264Picture *pic;
    int i, ret;
    const int pixel_shift = h->pixel_shift;

    release_unused_pictures(h, 1);
    h->cur_pic_ptr = NULL;

    i = find_unused_picture(h);
    if (i < 0) {
        av_log(h->avctx, AV_LOG_ERROR, "no frame buffer available\n");
        return i;
    }
    pic = &h->DPB[i];

    pic->reference              = h->droppable ? 0 : h->picture_structure;
559
    pic->f->coded_picture_number = h->coded_picture_number++;
560 561 562 563 564 565
    pic->field_picture          = h->picture_structure != PICT_FRAME;
    /*
     * Zero key_frame here; IDR markings per slice in frame or fields are ORed
     * in later.
     * See decode_nal_units().
     */
566
    pic->f->key_frame = 0;
567 568 569 570 571 572 573 574 575 576 577
    pic->mmco_reset  = 0;
    pic->recovered   = 0;

    if ((ret = alloc_picture(h, pic)) < 0)
        return ret;

    h->cur_pic_ptr = pic;
    ff_h264_unref_picture(h, &h->cur_pic);
    if ((ret = ff_h264_ref_picture(h, &h->cur_pic, h->cur_pic_ptr)) < 0)
        return ret;

578
    if (CONFIG_ERROR_RESILIENCE && h->enable_er)
579
        ff_er_frame_start(&h->slice_ctx[0].er);
580 581

    for (i = 0; i < 16; i++) {
582 583
        h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);
        h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);
584 585 586
    }
    for (i = 0; i < 16; i++) {
        h->block_offset[16 + i]      =
587
        h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 4 * pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);
588
        h->block_offset[48 + 16 + i] =
589
        h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7) << pixel_shift) + 8 * pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);
590 591 592 593 594 595 596 597 598
    }

    /* Some macroblocks can be accessed before they're available in case
     * of lost slices, MBAFF or threading. */
    memset(h->slice_table, -1,
           (h->mb_height * h->mb_stride - 1) * sizeof(*h->slice_table));

    /* We mark the current picture as non-reference after allocating it, so
     * that if we break out due to an error it can be released automatically
599
     * in the next ff_mpv_frame_start().
600 601 602 603 604 605 606 607 608 609 610 611
     */
    h->cur_pic_ptr->reference = 0;

    h->cur_pic_ptr->field_poc[0] = h->cur_pic_ptr->field_poc[1] = INT_MAX;

    h->next_output_pic = NULL;

    assert(h->cur_pic_ptr->long_ref == 0);

    return 0;
}

612
static av_always_inline void backup_mb_border(const H264Context *h, H264SliceContext *sl,
613
                                              uint8_t *src_y,
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
                                              uint8_t *src_cb, uint8_t *src_cr,
                                              int linesize, int uvlinesize,
                                              int simple)
{
    uint8_t *top_border;
    int top_idx = 1;
    const int pixel_shift = h->pixel_shift;
    int chroma444 = CHROMA444(h);
    int chroma422 = CHROMA422(h);

    src_y  -= linesize;
    src_cb -= uvlinesize;
    src_cr -= uvlinesize;

    if (!simple && FRAME_MBAFF(h)) {
629
        if (sl->mb_y & 1) {
630
            if (!MB_MBAFF(sl)) {
631
                top_border = sl->top_borders[0][sl->mb_x];
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
                AV_COPY128(top_border, src_y + 15 * linesize);
                if (pixel_shift)
                    AV_COPY128(top_border + 16, src_y + 15 * linesize + 16);
                if (simple || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
                    if (chroma444) {
                        if (pixel_shift) {
                            AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
                            AV_COPY128(top_border + 48, src_cb + 15 * uvlinesize + 16);
                            AV_COPY128(top_border + 64, src_cr + 15 * uvlinesize);
                            AV_COPY128(top_border + 80, src_cr + 15 * uvlinesize + 16);
                        } else {
                            AV_COPY128(top_border + 16, src_cb + 15 * uvlinesize);
                            AV_COPY128(top_border + 32, src_cr + 15 * uvlinesize);
                        }
                    } else if (chroma422) {
                        if (pixel_shift) {
                            AV_COPY128(top_border + 32, src_cb + 15 * uvlinesize);
                            AV_COPY128(top_border + 48, src_cr + 15 * uvlinesize);
                        } else {
                            AV_COPY64(top_border + 16, src_cb + 15 * uvlinesize);
                            AV_COPY64(top_border + 24, src_cr + 15 * uvlinesize);
                        }
                    } else {
                        if (pixel_shift) {
                            AV_COPY128(top_border + 32, src_cb + 7 * uvlinesize);
                            AV_COPY128(top_border + 48, src_cr + 7 * uvlinesize);
                        } else {
                            AV_COPY64(top_border + 16, src_cb + 7 * uvlinesize);
                            AV_COPY64(top_border + 24, src_cr + 7 * uvlinesize);
                        }
                    }
                }
            }
665
        } else if (MB_MBAFF(sl)) {
666 667 668 669 670
            top_idx = 0;
        } else
            return;
    }

671
    top_border = sl->top_borders[top_idx][sl->mb_x];
672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
    /* There are two lines saved, the line above the top macroblock
     * of a pair, and the line above the bottom macroblock. */
    AV_COPY128(top_border, src_y + 16 * linesize);
    if (pixel_shift)
        AV_COPY128(top_border + 16, src_y + 16 * linesize + 16);

    if (simple || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
        if (chroma444) {
            if (pixel_shift) {
                AV_COPY128(top_border + 32, src_cb + 16 * linesize);
                AV_COPY128(top_border + 48, src_cb + 16 * linesize + 16);
                AV_COPY128(top_border + 64, src_cr + 16 * linesize);
                AV_COPY128(top_border + 80, src_cr + 16 * linesize + 16);
            } else {
                AV_COPY128(top_border + 16, src_cb + 16 * linesize);
                AV_COPY128(top_border + 32, src_cr + 16 * linesize);
            }
        } else if (chroma422) {
            if (pixel_shift) {
                AV_COPY128(top_border + 32, src_cb + 16 * uvlinesize);
                AV_COPY128(top_border + 48, src_cr + 16 * uvlinesize);
            } else {
                AV_COPY64(top_border + 16, src_cb + 16 * uvlinesize);
                AV_COPY64(top_border + 24, src_cr + 16 * uvlinesize);
            }
        } else {
            if (pixel_shift) {
                AV_COPY128(top_border + 32, src_cb + 8 * uvlinesize);
                AV_COPY128(top_border + 48, src_cr + 8 * uvlinesize);
            } else {
                AV_COPY64(top_border + 16, src_cb + 8 * uvlinesize);
                AV_COPY64(top_border + 24, src_cr + 8 * uvlinesize);
            }
        }
    }
}

/**
 * Initialize implicit_weight table.
 * @param field  0/1 initialize the weight for interlaced MBAFF
 *                -1 initializes the rest
 */
714
static void implicit_weight_table(const H264Context *h, H264SliceContext *sl, int field)
715 716 717 718
{
    int ref0, ref1, i, cur_poc, ref_start, ref_count0, ref_count1;

    for (i = 0; i < 2; i++) {
719 720
        sl->luma_weight_flag[i]   = 0;
        sl->chroma_weight_flag[i] = 0;
721 722 723 724 725 726 727 728
    }

    if (field < 0) {
        if (h->picture_structure == PICT_FRAME) {
            cur_poc = h->cur_pic_ptr->poc;
        } else {
            cur_poc = h->cur_pic_ptr->field_poc[h->picture_structure - 1];
        }
729 730
        if (sl->ref_count[0] == 1 && sl->ref_count[1] == 1 && !FRAME_MBAFF(h) &&
            sl->ref_list[0][0].poc + sl->ref_list[1][0].poc == 2 * cur_poc) {
731 732
            sl->use_weight        = 0;
            sl->use_weight_chroma = 0;
733 734 735
            return;
        }
        ref_start  = 0;
736 737
        ref_count0 = sl->ref_count[0];
        ref_count1 = sl->ref_count[1];
738 739 740
    } else {
        cur_poc    = h->cur_pic_ptr->field_poc[field];
        ref_start  = 16;
741 742
        ref_count0 = 16 + 2 * sl->ref_count[0];
        ref_count1 = 16 + 2 * sl->ref_count[1];
743 744
    }

745 746 747 748
    sl->use_weight               = 2;
    sl->use_weight_chroma        = 2;
    sl->luma_log2_weight_denom   = 5;
    sl->chroma_log2_weight_denom = 5;
749 750

    for (ref0 = ref_start; ref0 < ref_count0; ref0++) {
751
        int poc0 = sl->ref_list[0][ref0].poc;
752 753
        for (ref1 = ref_start; ref1 < ref_count1; ref1++) {
            int w = 32;
754
            if (!sl->ref_list[0][ref0].parent->long_ref && !sl->ref_list[1][ref1].parent->long_ref) {
755
                int poc1 = sl->ref_list[1][ref1].poc;
756
                int td   = av_clip_int8(poc1 - poc0);
757
                if (td) {
758
                    int tb = av_clip_int8(cur_poc - poc0);
759 760 761 762 763 764 765
                    int tx = (16384 + (FFABS(td) >> 1)) / td;
                    int dist_scale_factor = (tb * tx + 32) >> 8;
                    if (dist_scale_factor >= -64 && dist_scale_factor <= 128)
                        w = 64 - dist_scale_factor;
                }
            }
            if (field < 0) {
766 767
                sl->implicit_weight[ref0][ref1][0] =
                sl->implicit_weight[ref0][ref1][1] = w;
768
            } else {
769
                sl->implicit_weight[ref0][ref1][field] = w;
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
            }
        }
    }
}

/**
 * initialize scan tables
 */
static void init_scan_tables(H264Context *h)
{
    int i;
    for (i = 0; i < 16; i++) {
#define TRANSPOSE(x) (x >> 2) | ((x << 2) & 0xF)
        h->zigzag_scan[i] = TRANSPOSE(zigzag_scan[i]);
        h->field_scan[i]  = TRANSPOSE(field_scan[i]);
#undef TRANSPOSE
    }
    for (i = 0; i < 64; i++) {
#define TRANSPOSE(x) (x >> 3) | ((x & 7) << 3)
        h->zigzag_scan8x8[i]       = TRANSPOSE(ff_zigzag_direct[i]);
        h->zigzag_scan8x8_cavlc[i] = TRANSPOSE(zigzag_scan8x8_cavlc[i]);
        h->field_scan8x8[i]        = TRANSPOSE(field_scan8x8[i]);
        h->field_scan8x8_cavlc[i]  = TRANSPOSE(field_scan8x8_cavlc[i]);
#undef TRANSPOSE
    }
    if (h->sps.transform_bypass) { // FIXME same ugly
        h->zigzag_scan_q0          = zigzag_scan;
        h->zigzag_scan8x8_q0       = ff_zigzag_direct;
        h->zigzag_scan8x8_cavlc_q0 = zigzag_scan8x8_cavlc;
        h->field_scan_q0           = field_scan;
        h->field_scan8x8_q0        = field_scan8x8;
        h->field_scan8x8_cavlc_q0  = field_scan8x8_cavlc;
    } else {
        h->zigzag_scan_q0          = h->zigzag_scan;
        h->zigzag_scan8x8_q0       = h->zigzag_scan8x8;
        h->zigzag_scan8x8_cavlc_q0 = h->zigzag_scan8x8_cavlc;
        h->field_scan_q0           = h->field_scan;
        h->field_scan8x8_q0        = h->field_scan8x8;
        h->field_scan8x8_cavlc_q0  = h->field_scan8x8_cavlc;
    }
}

static enum AVPixelFormat get_pixel_format(H264Context *h)
{
814 815 816 817 818
#define HWACCEL_MAX (CONFIG_H264_DXVA2_HWACCEL + \
                     CONFIG_H264_VAAPI_HWACCEL + \
                     (CONFIG_H264_VDA_HWACCEL * 2) + \
                     CONFIG_H264_VDPAU_HWACCEL)
    enum AVPixelFormat pix_fmts[HWACCEL_MAX + 2], *fmt = pix_fmts;
819 820
    const enum AVPixelFormat *choices = pix_fmts;

821 822 823 824
    switch (h->sps.bit_depth_luma) {
    case 9:
        if (CHROMA444(h)) {
            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
825
                *fmt++ = AV_PIX_FMT_GBRP9;
826
            } else
827
                *fmt++ = AV_PIX_FMT_YUV444P9;
828
        } else if (CHROMA422(h))
829
            *fmt++ = AV_PIX_FMT_YUV422P9;
830
        else
831
            *fmt++ = AV_PIX_FMT_YUV420P9;
832 833 834 835
        break;
    case 10:
        if (CHROMA444(h)) {
            if (h->avctx->colorspace == AVCOL_SPC_RGB) {
836
                *fmt++ = AV_PIX_FMT_GBRP10;
837
            } else
838
                *fmt++ = AV_PIX_FMT_YUV444P10;
839
        } else if (CHROMA422(h))
840
            *fmt++ = AV_PIX_FMT_YUV422P10;
841
        else
842
            *fmt++ = AV_PIX_FMT_YUV420P10;
843 844
        break;
    case 8:
845 846 847
#if CONFIG_H264_VDPAU_HWACCEL
        *fmt++ = AV_PIX_FMT_VDPAU;
#endif
848
        if (CHROMA444(h)) {
849
            if (h->avctx->colorspace == AVCOL_SPC_RGB)
850
                *fmt++ = AV_PIX_FMT_GBRP;
851
            else if (h->avctx->color_range == AVCOL_RANGE_JPEG)
852
                *fmt++ = AV_PIX_FMT_YUVJ444P;
853
            else
854
                *fmt++ = AV_PIX_FMT_YUV444P;
855
        } else if (CHROMA422(h)) {
856
            if (h->avctx->color_range == AVCOL_RANGE_JPEG)
857
                *fmt++ = AV_PIX_FMT_YUVJ422P;
858
            else
859
                *fmt++ = AV_PIX_FMT_YUV422P;
860
        } else {
861 862 863 864 865 866 867 868 869 870
#if CONFIG_H264_DXVA2_HWACCEL
            *fmt++ = AV_PIX_FMT_DXVA2_VLD;
#endif
#if CONFIG_H264_VAAPI_HWACCEL
            *fmt++ = AV_PIX_FMT_VAAPI_VLD;
#endif
#if CONFIG_H264_VDA_HWACCEL
            *fmt++ = AV_PIX_FMT_VDA_VLD;
            *fmt++ = AV_PIX_FMT_VDA;
#endif
871 872 873
            if (h->avctx->codec->pix_fmts)
                choices = h->avctx->codec->pix_fmts;
            else if (h->avctx->color_range == AVCOL_RANGE_JPEG)
874
                *fmt++ = AV_PIX_FMT_YUVJ420P;
875
            else
876
                *fmt++ = AV_PIX_FMT_YUV420P;
877 878 879 880 881 882 883
        }
        break;
    default:
        av_log(h->avctx, AV_LOG_ERROR,
               "Unsupported bit depth %d\n", h->sps.bit_depth_luma);
        return AVERROR_INVALIDDATA;
    }
884

885 886
    *fmt = AV_PIX_FMT_NONE;

887
    return ff_get_format(h->avctx, choices);
888 889 890 891 892 893 894
}

/* export coded and cropped frame dimensions to AVCodecContext */
static int init_dimensions(H264Context *h)
{
    int width  = h->width  - (h->sps.crop_right + h->sps.crop_left);
    int height = h->height - (h->sps.crop_top   + h->sps.crop_bottom);
895 896
    int crop_present = h->sps.crop_left  || h->sps.crop_top ||
                       h->sps.crop_right || h->sps.crop_bottom;
897 898

    /* handle container cropping */
899
    if (!crop_present &&
900 901 902 903 904 905 906 907 908 909 910 911 912
        FFALIGN(h->avctx->width,  16) == h->width &&
        FFALIGN(h->avctx->height, 16) == h->height) {
        width  = h->avctx->width;
        height = h->avctx->height;
    }

    if (width <= 0 || height <= 0) {
        av_log(h->avctx, AV_LOG_ERROR, "Invalid cropped dimensions: %dx%d.\n",
               width, height);
        if (h->avctx->err_recognition & AV_EF_EXPLODE)
            return AVERROR_INVALIDDATA;

        av_log(h->avctx, AV_LOG_WARNING, "Ignoring cropping information.\n");
913 914 915 916
        h->sps.crop_bottom =
        h->sps.crop_top    =
        h->sps.crop_right  =
        h->sps.crop_left   =
917 918 919 920 921 922 923 924 925 926 927 928 929 930
        h->sps.crop        = 0;

        width  = h->width;
        height = h->height;
    }

    h->avctx->coded_width  = h->width;
    h->avctx->coded_height = h->height;
    h->avctx->width        = width;
    h->avctx->height       = height;

    return 0;
}

931
static int h264_slice_header_init(H264Context *h)
932 933 934 935 936 937
{
    int nb_slices = (HAVE_THREADS &&
                     h->avctx->active_thread_type & FF_THREAD_SLICE) ?
                    h->avctx->thread_count : 1;
    int i, ret;

938
    ff_set_sar(h->avctx, h->sps.sar);
939 940 941 942 943 944 945
    av_pix_fmt_get_chroma_sub_sample(h->avctx->pix_fmt,
                                     &h->chroma_x_shift, &h->chroma_y_shift);

    if (h->sps.timing_info_present_flag) {
        int64_t den = h->sps.time_scale;
        if (h->x264_build < 44U)
            den *= 2;
946
        av_reduce(&h->avctx->framerate.den, &h->avctx->framerate.num,
947 948 949
                  h->sps.num_units_in_tick, den, 1 << 30);
    }

950 951
    ff_h264_free_tables(h);

952 953 954 955 956 957 958 959 960 961
    h->first_field           = 0;
    h->prev_interlaced_frame = 1;

    init_scan_tables(h);
    ret = ff_h264_alloc_tables(h);
    if (ret < 0) {
        av_log(h->avctx, AV_LOG_ERROR, "Could not allocate memory\n");
        return ret;
    }

962 963 964 965 966 967 968 969
    if (h->sps.bit_depth_luma < 8 || h->sps.bit_depth_luma > 10) {
        av_log(h->avctx, AV_LOG_ERROR, "Unsupported bit depth %d\n",
               h->sps.bit_depth_luma);
        return AVERROR_INVALIDDATA;
    }

    h->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
    h->pixel_shift                = h->sps.bit_depth_luma > 8;
970 971
    h->chroma_format_idc          = h->sps.chroma_format_idc;
    h->bit_depth_luma             = h->sps.bit_depth_luma;
972 973 974 975 976 977 978 979 980

    ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma,
                    h->sps.chroma_format_idc);
    ff_h264chroma_init(&h->h264chroma, h->sps.bit_depth_chroma);
    ff_h264qpel_init(&h->h264qpel, h->sps.bit_depth_luma);
    ff_h264_pred_init(&h->hpc, h->avctx->codec_id, h->sps.bit_depth_luma,
                      h->sps.chroma_format_idc);
    ff_videodsp_init(&h->vdsp, h->sps.bit_depth_luma);

981 982 983 984 985 986 987 988 989 990 991 992 993
    if (nb_slices > H264_MAX_THREADS || (nb_slices > h->mb_height && h->mb_height)) {
        int max_slices;
        if (h->mb_height)
            max_slices = FFMIN(H264_MAX_THREADS, h->mb_height);
        else
            max_slices = H264_MAX_THREADS;
        av_log(h->avctx, AV_LOG_WARNING, "too many threads/slices %d,"
               " reducing to %d\n", nb_slices, max_slices);
        nb_slices = max_slices;
    }
    h->slice_context_count = nb_slices;

    if (!HAVE_THREADS || !(h->avctx->active_thread_type & FF_THREAD_SLICE)) {
994
        ret = ff_h264_slice_context_init(h, &h->slice_ctx[0]);
995 996 997 998 999
        if (ret < 0) {
            av_log(h->avctx, AV_LOG_ERROR, "context_init() failed.\n");
            return ret;
        }
    } else {
1000 1001
        for (i = 0; i < h->slice_context_count; i++) {
            H264SliceContext *sl = &h->slice_ctx[i];
1002

1003 1004 1005 1006 1007 1008
            sl->h264               = h;
            sl->intra4x4_pred_mode = h->intra4x4_pred_mode + i * 8 * 2 * h->mb_stride;
            sl->mvd_table[0]       = h->mvd_table[0]       + i * 8 * 2 * h->mb_stride;
            sl->mvd_table[1]       = h->mvd_table[1]       + i * 8 * 2 * h->mb_stride;

            if ((ret = ff_h264_slice_context_init(h, sl)) < 0) {
1009 1010 1011
                av_log(h->avctx, AV_LOG_ERROR, "context_init() failed.\n");
                return ret;
            }
1012
        }
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
    }

    h->context_initialized = 1;

    return 0;
}

/**
 * Decode a slice header.
 * This will (re)intialize the decoder and call h264_frame_start() as needed.
 *
 * @param h h264context
 *
 * @return 0 if okay, <0 if an error occurred, 1 if decoding must not be multithreaded
 */
1028
int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
{
    unsigned int first_mb_in_slice;
    unsigned int pps_id;
    int ret;
    unsigned int slice_type, tmp, i, j;
    int default_ref_list_done = 0;
    int last_pic_structure, last_pic_droppable;
    int needs_reinit = 0;
    int field_pic_flag, bottom_field_flag;

    h->qpel_put = h->h264qpel.put_h264_qpel_pixels_tab;
    h->qpel_avg = h->h264qpel.avg_h264_qpel_pixels_tab;

1042
    first_mb_in_slice = get_ue_golomb(&sl->gb);
1043 1044

    if (first_mb_in_slice == 0) { // FIXME better field boundary detection
1045
        if (h->current_slice && h->cur_pic_ptr && FIELD_PICTURE(h)) {
1046
            ff_h264_field_end(h, sl, 1);
1047 1048
        }

1049 1050
        h->current_slice = 0;
        if (!h->first_field) {
1051 1052 1053 1054 1055 1056 1057 1058
            if (h->cur_pic_ptr && !h->droppable) {
                ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
                                          h->picture_structure == PICT_BOTTOM_FIELD);
            }
            h->cur_pic_ptr = NULL;
        }
    }

1059
    slice_type = get_ue_golomb_31(&sl->gb);
1060 1061
    if (slice_type > 9) {
        av_log(h->avctx, AV_LOG_ERROR,
1062 1063
               "slice type %d too large at %d\n",
               slice_type, first_mb_in_slice);
1064 1065 1066 1067
        return AVERROR_INVALIDDATA;
    }
    if (slice_type > 4) {
        slice_type -= 5;
1068
        sl->slice_type_fixed = 1;
1069
    } else
1070
        sl->slice_type_fixed = 0;
1071 1072 1073

    slice_type = golomb_to_pict_type[slice_type];
    if (slice_type == AV_PICTURE_TYPE_I ||
1074
        (h->current_slice != 0 && slice_type == h->last_slice_type)) {
1075 1076
        default_ref_list_done = 1;
    }
1077 1078
    sl->slice_type     = slice_type;
    sl->slice_type_nos = slice_type & 3;
1079 1080

    if (h->nal_unit_type  == NAL_IDR_SLICE &&
1081
        sl->slice_type_nos != AV_PICTURE_TYPE_I) {
1082 1083 1084 1085 1086
        av_log(h->avctx, AV_LOG_ERROR, "A non-intra slice in an IDR NAL unit.\n");
        return AVERROR_INVALIDDATA;
    }

    // to make a few old functions happy, it's wrong though
1087
    h->pict_type = sl->slice_type;
1088

1089
    pps_id = get_ue_golomb(&sl->gb);
1090 1091 1092 1093
    if (pps_id >= MAX_PPS_COUNT) {
        av_log(h->avctx, AV_LOG_ERROR, "pps_id %u out of range\n", pps_id);
        return AVERROR_INVALIDDATA;
    }
1094
    if (!h->pps_buffers[pps_id]) {
1095 1096 1097 1098 1099
        av_log(h->avctx, AV_LOG_ERROR,
               "non-existing PPS %u referenced\n",
               pps_id);
        return AVERROR_INVALIDDATA;
    }
1100
    h->pps = *h->pps_buffers[pps_id];
1101

1102
    if (!h->sps_buffers[h->pps.sps_id]) {
1103 1104 1105 1106 1107 1108 1109
        av_log(h->avctx, AV_LOG_ERROR,
               "non-existing SPS %u referenced\n",
               h->pps.sps_id);
        return AVERROR_INVALIDDATA;
    }

    if (h->pps.sps_id != h->sps.sps_id ||
1110 1111
        h->sps_buffers[h->pps.sps_id]->new) {
        h->sps_buffers[h->pps.sps_id]->new = 0;
1112

1113
        h->sps = *h->sps_buffers[h->pps.sps_id];
1114 1115

        if (h->bit_depth_luma    != h->sps.bit_depth_luma ||
1116
            h->chroma_format_idc != h->sps.chroma_format_idc)
1117
            needs_reinit         = 1;
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131

        if (h->flags & CODEC_FLAG_LOW_DELAY ||
            (h->sps.bitstream_restriction_flag &&
             !h->sps.num_reorder_frames)) {
            if (h->avctx->has_b_frames > 1 || h->delayed_pic[0])
                av_log(h->avctx, AV_LOG_WARNING, "Delayed frames seen. "
                       "Reenabling low delay requires a codec flush.\n");
            else
                h->low_delay = 1;
        }

        if (h->avctx->has_b_frames < 2)
            h->avctx->has_b_frames = !h->low_delay;

1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
    }

    h->avctx->profile = ff_h264_get_profile(&h->sps);
    h->avctx->level   = h->sps.level_idc;
    h->avctx->refs    = h->sps.ref_frame_count;

    if (h->mb_width  != h->sps.mb_width ||
        h->mb_height != h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag))
        needs_reinit = 1;

    h->mb_width  = h->sps.mb_width;
    h->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
    h->mb_num    = h->mb_width * h->mb_height;
    h->mb_stride = h->mb_width + 1;

    h->b_stride = h->mb_width * 4;

    h->chroma_y_shift = h->sps.chroma_format_idc <= 1; // 400 uses yuv420p

    h->width  = 16 * h->mb_width;
    h->height = 16 * h->mb_height;

    ret = init_dimensions(h);
    if (ret < 0)
        return ret;

    if (h->sps.video_signal_type_present_flag) {
        h->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG
                                                  : AVCOL_RANGE_MPEG;
        if (h->sps.colour_description_present_flag) {
            if (h->avctx->colorspace != h->sps.colorspace)
                needs_reinit = 1;
            h->avctx->color_primaries = h->sps.color_primaries;
            h->avctx->color_trc       = h->sps.color_trc;
            h->avctx->colorspace      = h->sps.colorspace;
        }
    }

1170
    if (h->context_initialized && needs_reinit) {
1171
        if (sl != h->slice_ctx) {
1172 1173 1174 1175 1176
            av_log(h->avctx, AV_LOG_ERROR,
                   "changing width %d -> %d / height %d -> %d on "
                   "slice %d\n",
                   h->width, h->avctx->coded_width,
                   h->height, h->avctx->coded_height,
1177
                   h->current_slice + 1);
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
            return AVERROR_INVALIDDATA;
        }

        ff_h264_flush_change(h);

        if ((ret = get_pixel_format(h)) < 0)
            return ret;
        h->avctx->pix_fmt = ret;

        av_log(h->avctx, AV_LOG_INFO, "Reinit context to %dx%d, "
               "pix_fmt: %d\n", h->width, h->height, h->avctx->pix_fmt);

1190
        if ((ret = h264_slice_header_init(h)) < 0) {
1191 1192 1193 1194 1195 1196
            av_log(h->avctx, AV_LOG_ERROR,
                   "h264_slice_header_init() failed\n");
            return ret;
        }
    }
    if (!h->context_initialized) {
1197
        if (sl != h->slice_ctx) {
1198 1199 1200 1201 1202 1203 1204 1205 1206
            av_log(h->avctx, AV_LOG_ERROR,
                   "Cannot (re-)initialize context during parallel decoding.\n");
            return AVERROR_PATCHWELCOME;
        }

        if ((ret = get_pixel_format(h)) < 0)
            return ret;
        h->avctx->pix_fmt = ret;

1207
        if ((ret = h264_slice_header_init(h)) < 0) {
1208 1209 1210 1211 1212 1213
            av_log(h->avctx, AV_LOG_ERROR,
                   "h264_slice_header_init() failed\n");
            return ret;
        }
    }

1214
    if (sl == h->slice_ctx && h->dequant_coeff_pps != pps_id) {
1215 1216 1217 1218
        h->dequant_coeff_pps = pps_id;
        h264_init_dequant_tables(h);
    }

1219
    h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
1220

1221
    sl->mb_mbaff       = 0;
1222
    h->mb_aff_frame    = 0;
1223 1224
    last_pic_structure = h->picture_structure;
    last_pic_droppable = h->droppable;
1225 1226 1227 1228
    h->droppable       = h->nal_ref_idc == 0;
    if (h->sps.frame_mbs_only_flag) {
        h->picture_structure = PICT_FRAME;
    } else {
1229
        field_pic_flag = get_bits1(&sl->gb);
1230
        if (field_pic_flag) {
1231
            bottom_field_flag = get_bits1(&sl->gb);
1232 1233 1234 1235 1236 1237
            h->picture_structure = PICT_TOP_FIELD + bottom_field_flag;
        } else {
            h->picture_structure = PICT_FRAME;
            h->mb_aff_frame      = h->sps.mb_aff;
        }
    }
1238
    sl->mb_field_decoding_flag = h->picture_structure != PICT_FRAME;
1239

1240
    if (h->current_slice != 0) {
1241 1242 1243 1244 1245 1246 1247 1248
        if (last_pic_structure != h->picture_structure ||
            last_pic_droppable != h->droppable) {
            av_log(h->avctx, AV_LOG_ERROR,
                   "Changing field mode (%d -> %d) between slices is not allowed\n",
                   last_pic_structure, h->picture_structure);
            h->picture_structure = last_pic_structure;
            h->droppable         = last_pic_droppable;
            return AVERROR_INVALIDDATA;
1249
        } else if (!h->cur_pic_ptr) {
1250 1251
            av_log(h->avctx, AV_LOG_ERROR,
                   "unset cur_pic_ptr on slice %d\n",
1252
                   h->current_slice + 1);
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
            return AVERROR_INVALIDDATA;
        }
    } else {
        /* Shorten frame num gaps so we don't have to allocate reference
         * frames just to throw them away */
        if (h->frame_num != h->prev_frame_num) {
            int unwrap_prev_frame_num = h->prev_frame_num;
            int max_frame_num         = 1 << h->sps.log2_max_frame_num;

            if (unwrap_prev_frame_num > h->frame_num)
                unwrap_prev_frame_num -= max_frame_num;

            if ((h->frame_num - unwrap_prev_frame_num) > h->sps.ref_frame_count) {
                unwrap_prev_frame_num = (h->frame_num - h->sps.ref_frame_count) - 1;
                if (unwrap_prev_frame_num < 0)
                    unwrap_prev_frame_num += max_frame_num;

                h->prev_frame_num = unwrap_prev_frame_num;
            }
        }

        /* See if we have a decoded first field looking for a pair...
         * Here, we're using that to see if we should mark previously
         * decode frames as "finished".
         * We have to do that before the "dummy" in-between frame allocation,
         * since that can modify s->current_picture_ptr. */
1279 1280
        if (h->first_field) {
            assert(h->cur_pic_ptr);
1281
            assert(h->cur_pic_ptr->f->buf[0]);
1282
            assert(h->cur_pic_ptr->reference != DELAYED_PIC_REF);
1283 1284 1285 1286 1287 1288

            /* figure out if we have a complementary field pair */
            if (!FIELD_PICTURE(h) || h->picture_structure == last_pic_structure) {
                /* Previous field is unmatched. Don't display it, but let it
                 * remain for reference if marked as such. */
                if (!last_pic_droppable && last_pic_structure != PICT_FRAME) {
1289
                    ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
1290 1291 1292
                                              last_pic_structure == PICT_TOP_FIELD);
                }
            } else {
1293
                if (h->cur_pic_ptr->frame_num != h->frame_num) {
1294 1295 1296 1297 1298
                    /* This and previous field were reference, but had
                     * different frame_nums. Consider this field first in
                     * pair. Throw away previous field except for reference
                     * purposes. */
                    if (!last_pic_droppable && last_pic_structure != PICT_FRAME) {
1299
                        ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
                                                  last_pic_structure == PICT_TOP_FIELD);
                    }
                } else {
                    /* Second field in complementary pair */
                    if (!((last_pic_structure   == PICT_TOP_FIELD &&
                           h->picture_structure == PICT_BOTTOM_FIELD) ||
                          (last_pic_structure   == PICT_BOTTOM_FIELD &&
                           h->picture_structure == PICT_TOP_FIELD))) {
                        av_log(h->avctx, AV_LOG_ERROR,
                               "Invalid field mode combination %d/%d\n",
                               last_pic_structure, h->picture_structure);
                        h->picture_structure = last_pic_structure;
                        h->droppable         = last_pic_droppable;
                        return AVERROR_INVALIDDATA;
                    } else if (last_pic_droppable != h->droppable) {
                        avpriv_request_sample(h->avctx,
                                              "Found reference and non-reference fields in the same frame, which");
                        h->picture_structure = last_pic_structure;
                        h->droppable         = last_pic_droppable;
                        return AVERROR_PATCHWELCOME;
                    }
                }
            }
        }

        while (h->frame_num != h->prev_frame_num &&
               h->frame_num != (h->prev_frame_num + 1) % (1 << h->sps.log2_max_frame_num)) {
            H264Picture *prev = h->short_ref_count ? h->short_ref[0] : NULL;
            av_log(h->avctx, AV_LOG_DEBUG, "Frame num gap %d %d\n",
                   h->frame_num, h->prev_frame_num);
            ret = h264_frame_start(h);
            if (ret < 0) {
1332
                h->first_field = 0;
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
                return ret;
            }

            h->prev_frame_num++;
            h->prev_frame_num        %= 1 << h->sps.log2_max_frame_num;
            h->cur_pic_ptr->frame_num = h->prev_frame_num;
            ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX, 0);
            ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX, 1);
            ret = ff_generate_sliding_window_mmcos(h, 1);
            if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
                return ret;
            ret = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
            if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
                return ret;
            /* Error concealment: If a ref is missing, copy the previous ref
             * in its place.
             * FIXME: Avoiding a memcpy would be nice, but ref handling makes
             * many assumptions about there being no actual duplicates.
             * FIXME: This does not copy padding for out-of-frame motion
             * vectors.  Given we are concealing a lost frame, this probably
             * is not noticeable by comparison, but it should be fixed. */
            if (h->short_ref_count) {
                if (prev) {
1356 1357 1358 1359
                    av_image_copy(h->short_ref[0]->f->data,
                                  h->short_ref[0]->f->linesize,
                                  (const uint8_t **)prev->f->data,
                                  prev->f->linesize,
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
                                  h->avctx->pix_fmt,
                                  h->mb_width  * 16,
                                  h->mb_height * 16);
                    h->short_ref[0]->poc = prev->poc + 2;
                }
                h->short_ref[0]->frame_num = h->prev_frame_num;
            }
        }

        /* See if we have a decoded first field looking for a pair...
         * We're using that to see whether to continue decoding in that
         * frame, or to allocate a new one. */
1372 1373
        if (h->first_field) {
            assert(h->cur_pic_ptr);
1374
            assert(h->cur_pic_ptr->f->buf[0]);
1375
            assert(h->cur_pic_ptr->reference != DELAYED_PIC_REF);
1376 1377 1378 1379 1380

            /* figure out if we have a complementary field pair */
            if (!FIELD_PICTURE(h) || h->picture_structure == last_pic_structure) {
                /* Previous field is unmatched. Don't display it, but let it
                 * remain for reference if marked as such. */
1381 1382
                h->cur_pic_ptr = NULL;
                h->first_field = FIELD_PICTURE(h);
1383
            } else {
1384
                if (h->cur_pic_ptr->frame_num != h->frame_num) {
1385 1386 1387
                    /* This and the previous field had different frame_nums.
                     * Consider this field first in pair. Throw away previous
                     * one except for reference purposes. */
1388 1389
                    h->first_field = 1;
                    h->cur_pic_ptr = NULL;
1390 1391
                } else {
                    /* Second field in complementary pair */
1392
                    h->first_field = 0;
1393 1394 1395 1396
                }
            }
        } else {
            /* Frame or first field in a potentially complementary pair */
1397
            h->first_field = FIELD_PICTURE(h);
1398 1399
        }

1400
        if (!FIELD_PICTURE(h) || h->first_field) {
1401
            if (h264_frame_start(h) < 0) {
1402
                h->first_field = 0;
1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
                return AVERROR_INVALIDDATA;
            }
        } else {
            release_unused_pictures(h, 0);
        }
    }

    h->cur_pic_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup

    assert(h->mb_num == h->mb_width * h->mb_height);
    if (first_mb_in_slice << FIELD_OR_MBAFF_PICTURE(h) >= h->mb_num ||
        first_mb_in_slice >= h->mb_num) {
        av_log(h->avctx, AV_LOG_ERROR, "first_mb_in_slice overflow\n");
        return AVERROR_INVALIDDATA;
    }
1418 1419 1420
    sl->resync_mb_x = sl->mb_x =  first_mb_in_slice % h->mb_width;
    sl->resync_mb_y = sl->mb_y = (first_mb_in_slice / h->mb_width) <<
                                 FIELD_OR_MBAFF_PICTURE(h);
1421
    if (h->picture_structure == PICT_BOTTOM_FIELD)
1422
        sl->resync_mb_y = sl->mb_y = sl->mb_y + 1;
1423
    assert(sl->mb_y < h->mb_height);
1424 1425 1426 1427 1428 1429 1430 1431 1432 1433

    if (h->picture_structure == PICT_FRAME) {
        h->curr_pic_num = h->frame_num;
        h->max_pic_num  = 1 << h->sps.log2_max_frame_num;
    } else {
        h->curr_pic_num = 2 * h->frame_num + 1;
        h->max_pic_num  = 1 << (h->sps.log2_max_frame_num + 1);
    }

    if (h->nal_unit_type == NAL_IDR_SLICE)
1434
        get_ue_golomb(&sl->gb); /* idr_pic_id */
1435 1436

    if (h->sps.poc_type == 0) {
1437
        h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
1438 1439

        if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
1440
            h->delta_poc_bottom = get_se_golomb(&sl->gb);
1441 1442 1443
    }

    if (h->sps.poc_type == 1 && !h->sps.delta_pic_order_always_zero_flag) {
1444
        h->delta_poc[0] = get_se_golomb(&sl->gb);
1445 1446

        if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
1447
            h->delta_poc[1] = get_se_golomb(&sl->gb);
1448 1449 1450 1451 1452
    }

    ff_init_poc(h, h->cur_pic_ptr->field_poc, &h->cur_pic_ptr->poc);

    if (h->pps.redundant_pic_cnt_present)
1453
        sl->redundant_pic_count = get_ue_golomb(&sl->gb);
1454

1455
    ret = ff_set_ref_count(h, sl);
1456 1457 1458 1459 1460 1461
    if (ret < 0)
        return ret;
    else if (ret == 1)
        default_ref_list_done = 0;

    if (!default_ref_list_done)
1462
        ff_h264_fill_default_ref_list(h, sl);
1463

1464
    if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
1465
       ret = ff_h264_decode_ref_pic_list_reordering(h, sl);
1466
       if (ret < 0) {
1467
           sl->ref_count[1] = sl->ref_count[0] = 0;
1468 1469 1470 1471
           return ret;
       }
    }

1472
    if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
1473
        (h->pps.weighted_bipred_idc == 1 &&
1474
         sl->slice_type_nos == AV_PICTURE_TYPE_B))
1475
        ff_pred_weight_table(h, sl);
1476
    else if (h->pps.weighted_bipred_idc == 2 &&
1477
             sl->slice_type_nos == AV_PICTURE_TYPE_B) {
1478
        implicit_weight_table(h, sl, -1);
1479
    } else {
1480
        sl->use_weight = 0;
1481
        for (i = 0; i < 2; i++) {
1482 1483
            sl->luma_weight_flag[i]   = 0;
            sl->chroma_weight_flag[i] = 0;
1484 1485 1486 1487 1488 1489 1490 1491 1492
        }
    }

    // If frame-mt is enabled, only update mmco tables for the first slice
    // in a field. Subsequent slices can temporarily clobber h->mmco_index
    // or h->mmco, which will cause ref list mix-ups and decoding errors
    // further down the line. This may break decoding if the first slice is
    // corrupt, thus we only do this if frame-mt is enabled.
    if (h->nal_ref_idc) {
1493
        ret = ff_h264_decode_ref_pic_marking(h, &sl->gb,
1494
                                             !(h->avctx->active_thread_type & FF_THREAD_FRAME) ||
1495
                                             h->current_slice == 0);
1496 1497 1498 1499 1500
        if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
            return AVERROR_INVALIDDATA;
    }

    if (FRAME_MBAFF(h)) {
1501
        ff_h264_fill_mbaff_ref_list(h, sl);
1502

1503
        if (h->pps.weighted_bipred_idc == 2 && sl->slice_type_nos == AV_PICTURE_TYPE_B) {
1504 1505
            implicit_weight_table(h, sl, 0);
            implicit_weight_table(h, sl, 1);
1506 1507 1508
        }
    }

1509
    if (sl->slice_type_nos == AV_PICTURE_TYPE_B && !sl->direct_spatial_mv_pred)
1510
        ff_h264_direct_dist_scale_factor(h, sl);
1511
    ff_h264_direct_ref_list_init(h, sl);
1512

1513
    if (sl->slice_type_nos != AV_PICTURE_TYPE_I && h->pps.cabac) {
1514
        tmp = get_ue_golomb_31(&sl->gb);
1515 1516 1517 1518
        if (tmp > 2) {
            av_log(h->avctx, AV_LOG_ERROR, "cabac_init_idc %u overflow\n", tmp);
            return AVERROR_INVALIDDATA;
        }
1519
        sl->cabac_init_idc = tmp;
1520 1521
    }

1522
    sl->last_qscale_diff = 0;
1523
    tmp = h->pps.init_qp + get_se_golomb(&sl->gb);
1524 1525 1526 1527
    if (tmp > 51 + 6 * (h->sps.bit_depth_luma - 8)) {
        av_log(h->avctx, AV_LOG_ERROR, "QP %u out of range\n", tmp);
        return AVERROR_INVALIDDATA;
    }
1528 1529 1530
    sl->qscale       = tmp;
    sl->chroma_qp[0] = get_chroma_qp(h, 0, sl->qscale);
    sl->chroma_qp[1] = get_chroma_qp(h, 1, sl->qscale);
1531
    // FIXME qscale / qp ... stuff
1532
    if (sl->slice_type == AV_PICTURE_TYPE_SP)
1533
        get_bits1(&sl->gb); /* sp_for_switch_flag */
1534 1535
    if (sl->slice_type == AV_PICTURE_TYPE_SP ||
        sl->slice_type == AV_PICTURE_TYPE_SI)
1536
        get_se_golomb(&sl->gb); /* slice_qs_delta */
1537

1538 1539 1540
    sl->deblocking_filter     = 1;
    sl->slice_alpha_c0_offset = 0;
    sl->slice_beta_offset     = 0;
1541
    if (h->pps.deblocking_filter_parameters_present) {
1542
        tmp = get_ue_golomb_31(&sl->gb);
1543 1544 1545 1546 1547
        if (tmp > 2) {
            av_log(h->avctx, AV_LOG_ERROR,
                   "deblocking_filter_idc %u out of range\n", tmp);
            return AVERROR_INVALIDDATA;
        }
1548 1549 1550 1551 1552
        sl->deblocking_filter = tmp;
        if (sl->deblocking_filter < 2)
            sl->deblocking_filter ^= 1;  // 1<->0

        if (sl->deblocking_filter) {
1553 1554
            sl->slice_alpha_c0_offset = get_se_golomb(&sl->gb) * 2;
            sl->slice_beta_offset     = get_se_golomb(&sl->gb) * 2;
1555 1556 1557 1558
            if (sl->slice_alpha_c0_offset >  12 ||
                sl->slice_alpha_c0_offset < -12 ||
                sl->slice_beta_offset >  12     ||
                sl->slice_beta_offset < -12) {
1559 1560
                av_log(h->avctx, AV_LOG_ERROR,
                       "deblocking filter parameters %d %d out of range\n",
1561
                       sl->slice_alpha_c0_offset, sl->slice_beta_offset);
1562 1563 1564 1565 1566 1567 1568
                return AVERROR_INVALIDDATA;
            }
        }
    }

    if (h->avctx->skip_loop_filter >= AVDISCARD_ALL ||
        (h->avctx->skip_loop_filter >= AVDISCARD_NONKEY &&
1569
         sl->slice_type_nos != AV_PICTURE_TYPE_I) ||
1570
        (h->avctx->skip_loop_filter >= AVDISCARD_BIDIR  &&
1571
         sl->slice_type_nos == AV_PICTURE_TYPE_B) ||
1572 1573
        (h->avctx->skip_loop_filter >= AVDISCARD_NONREF &&
         h->nal_ref_idc == 0))
1574
        sl->deblocking_filter = 0;
1575

1576
    if (sl->deblocking_filter == 1 && h->max_contexts > 1) {
1577 1578 1579
        if (h->avctx->flags2 & CODEC_FLAG2_FAST) {
            /* Cheat slightly for speed:
             * Do not bother to deblock across slices. */
1580
            sl->deblocking_filter = 2;
1581
        } else {
1582 1583
            h->max_contexts = 1;
            if (!h->single_decode_warning) {
1584 1585
                av_log(h->avctx, AV_LOG_INFO,
                       "Cannot parallelize deblocking type 1, decoding such frames in sequential order\n");
1586
                h->single_decode_warning = 1;
1587
            }
1588
            if (sl != h->slice_ctx) {
1589 1590 1591 1592 1593 1594
                av_log(h->avctx, AV_LOG_ERROR,
                       "Deblocking switched inside frame.\n");
                return 1;
            }
        }
    }
1595
    sl->qp_thresh = 15 -
1596
                   FFMIN(sl->slice_alpha_c0_offset, sl->slice_beta_offset) -
1597 1598 1599 1600 1601
                   FFMAX3(0,
                          h->pps.chroma_qp_index_offset[0],
                          h->pps.chroma_qp_index_offset[1]) +
                   6 * (h->sps.bit_depth_luma - 8);

1602 1603
    h->last_slice_type = slice_type;
    sl->slice_num       = ++h->current_slice;
1604
    if (sl->slice_num >= MAX_SLICES) {
1605 1606 1607 1608 1609 1610
        av_log(h->avctx, AV_LOG_ERROR,
               "Too many slices, increase MAX_SLICES and recompile\n");
    }

    for (j = 0; j < 2; j++) {
        int id_list[16];
1611
        int *ref2frm = sl->ref2frm[sl->slice_num & (MAX_SLICES - 1)][j];
1612 1613
        for (i = 0; i < 16; i++) {
            id_list[i] = 60;
1614
            if (j < sl->list_count && i < sl->ref_count[j] &&
1615
                sl->ref_list[j][i].parent->f->buf[0]) {
1616
                int k;
1617
                AVBuffer *buf = sl->ref_list[j][i].parent->f->buf[0]->buffer;
1618
                for (k = 0; k < h->short_ref_count; k++)
1619
                    if (h->short_ref[k]->f->buf[0]->buffer == buf) {
1620 1621 1622 1623
                        id_list[i] = k;
                        break;
                    }
                for (k = 0; k < h->long_ref_count; k++)
1624
                    if (h->long_ref[k] && h->long_ref[k]->f->buf[0]->buffer == buf) {
1625 1626 1627 1628 1629 1630 1631 1632 1633
                        id_list[i] = h->short_ref_count + k;
                        break;
                    }
            }
        }

        ref2frm[0] =
        ref2frm[1] = -1;
        for (i = 0; i < 16; i++)
1634
            ref2frm[i + 2] = 4 * id_list[i] + (sl->ref_list[j][i].reference & 3);
1635 1636 1637 1638
        ref2frm[18 + 0] =
        ref2frm[18 + 1] = -1;
        for (i = 16; i < 48; i++)
            ref2frm[i + 4] = 4 * id_list[(i - 16) >> 1] +
1639
                             (sl->ref_list[j][i].reference & 3);
1640 1641 1642 1643 1644
    }

    if (h->avctx->debug & FF_DEBUG_PICT_INFO) {
        av_log(h->avctx, AV_LOG_DEBUG,
               "slice:%d %s mb:%d %c%s%s pps:%u frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d:%d:%d weight:%d%s %s\n",
1645
               sl->slice_num,
1646 1647
               (h->picture_structure == PICT_FRAME ? "F" : h->picture_structure == PICT_TOP_FIELD ? "T" : "B"),
               first_mb_in_slice,
1648 1649
               av_get_picture_type_char(sl->slice_type),
               sl->slice_type_fixed ? " fix" : "",
1650 1651 1652 1653
               h->nal_unit_type == NAL_IDR_SLICE ? " IDR" : "",
               pps_id, h->frame_num,
               h->cur_pic_ptr->field_poc[0],
               h->cur_pic_ptr->field_poc[1],
1654
               sl->ref_count[0], sl->ref_count[1],
1655
               sl->qscale,
1656 1657
               sl->deblocking_filter,
               sl->slice_alpha_c0_offset, sl->slice_beta_offset,
1658 1659
               sl->use_weight,
               sl->use_weight == 1 && sl->use_weight_chroma ? "c" : "",
1660
               sl->slice_type == AV_PICTURE_TYPE_B ? (sl->direct_spatial_mv_pred ? "SPAT" : "TEMP") : "");
1661 1662 1663 1664 1665
    }

    return 0;
}

1666
int ff_h264_get_slice_type(const H264SliceContext *sl)
1667
{
1668
    switch (sl->slice_type) {
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
    case AV_PICTURE_TYPE_P:
        return 0;
    case AV_PICTURE_TYPE_B:
        return 1;
    case AV_PICTURE_TYPE_I:
        return 2;
    case AV_PICTURE_TYPE_SP:
        return 3;
    case AV_PICTURE_TYPE_SI:
        return 4;
    default:
        return AVERROR_INVALIDDATA;
    }
}

1684
static av_always_inline void fill_filter_caches_inter(const H264Context *h,
1685
                                                      H264SliceContext *sl,
1686 1687 1688 1689 1690 1691 1692
                                                      int mb_type, int top_xy,
                                                      int left_xy[LEFT_MBS],
                                                      int top_type,
                                                      int left_type[LEFT_MBS],
                                                      int mb_xy, int list)
{
    int b_stride = h->b_stride;
1693 1694
    int16_t(*mv_dst)[2] = &sl->mv_cache[list][scan8[0]];
    int8_t *ref_cache   = &sl->ref_cache[list][scan8[0]];
1695 1696 1697 1698
    if (IS_INTER(mb_type) || IS_DIRECT(mb_type)) {
        if (USES_LIST(top_type, list)) {
            const int b_xy  = h->mb2b_xy[top_xy] + 3 * b_stride;
            const int b8_xy = 4 * top_xy + 2;
1699
            int (*ref2frm)[64] = sl->ref2frm[h->slice_table[top_xy] & (MAX_SLICES - 1)][0] + (MB_MBAFF(sl) ? 20 : 2);
1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
            AV_COPY128(mv_dst - 1 * 8, h->cur_pic.motion_val[list][b_xy + 0]);
            ref_cache[0 - 1 * 8] =
            ref_cache[1 - 1 * 8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 0]];
            ref_cache[2 - 1 * 8] =
            ref_cache[3 - 1 * 8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 1]];
        } else {
            AV_ZERO128(mv_dst - 1 * 8);
            AV_WN32A(&ref_cache[0 - 1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
        }

        if (!IS_INTERLACED(mb_type ^ left_type[LTOP])) {
            if (USES_LIST(left_type[LTOP], list)) {
                const int b_xy  = h->mb2b_xy[left_xy[LTOP]] + 3;
                const int b8_xy = 4 * left_xy[LTOP] + 1;
1714
                int (*ref2frm)[64] = sl->ref2frm[h->slice_table[left_xy[LTOP]] & (MAX_SLICES - 1)][0] + (MB_MBAFF(sl) ? 20 : 2);
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
                AV_COPY32(mv_dst - 1 +  0, h->cur_pic.motion_val[list][b_xy + b_stride * 0]);
                AV_COPY32(mv_dst - 1 +  8, h->cur_pic.motion_val[list][b_xy + b_stride * 1]);
                AV_COPY32(mv_dst - 1 + 16, h->cur_pic.motion_val[list][b_xy + b_stride * 2]);
                AV_COPY32(mv_dst - 1 + 24, h->cur_pic.motion_val[list][b_xy + b_stride * 3]);
                ref_cache[-1 +  0] =
                ref_cache[-1 +  8] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 2 * 0]];
                ref_cache[-1 + 16] =
                ref_cache[-1 + 24] = ref2frm[list][h->cur_pic.ref_index[list][b8_xy + 2 * 1]];
            } else {
                AV_ZERO32(mv_dst - 1 +  0);
                AV_ZERO32(mv_dst - 1 +  8);
                AV_ZERO32(mv_dst - 1 + 16);
                AV_ZERO32(mv_dst - 1 + 24);
                ref_cache[-1 +  0] =
                ref_cache[-1 +  8] =
                ref_cache[-1 + 16] =
                ref_cache[-1 + 24] = LIST_NOT_USED;
            }
        }
    }

    if (!USES_LIST(mb_type, list)) {
        fill_rectangle(mv_dst, 4, 4, 8, pack16to32(0, 0), 4);
        AV_WN32A(&ref_cache[0 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
        AV_WN32A(&ref_cache[1 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
        AV_WN32A(&ref_cache[2 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
        AV_WN32A(&ref_cache[3 * 8], ((LIST_NOT_USED) & 0xFF) * 0x01010101u);
        return;
    }

    {
        int8_t *ref = &h->cur_pic.ref_index[list][4 * mb_xy];
1747
        int (*ref2frm)[64] = sl->ref2frm[sl->slice_num & (MAX_SLICES - 1)][0] + (MB_MBAFF(sl) ? 20 : 2);
1748 1749 1750 1751 1752 1753 1754 1755 1756
        uint32_t ref01 = (pack16to32(ref2frm[list][ref[0]], ref2frm[list][ref[1]]) & 0x00FF00FF) * 0x0101;
        uint32_t ref23 = (pack16to32(ref2frm[list][ref[2]], ref2frm[list][ref[3]]) & 0x00FF00FF) * 0x0101;
        AV_WN32A(&ref_cache[0 * 8], ref01);
        AV_WN32A(&ref_cache[1 * 8], ref01);
        AV_WN32A(&ref_cache[2 * 8], ref23);
        AV_WN32A(&ref_cache[3 * 8], ref23);
    }

    {
1757
        int16_t(*mv_src)[2] = &h->cur_pic.motion_val[list][4 * sl->mb_x + 4 * sl->mb_y * b_stride];
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
        AV_COPY128(mv_dst + 8 * 0, mv_src + 0 * b_stride);
        AV_COPY128(mv_dst + 8 * 1, mv_src + 1 * b_stride);
        AV_COPY128(mv_dst + 8 * 2, mv_src + 2 * b_stride);
        AV_COPY128(mv_dst + 8 * 3, mv_src + 3 * b_stride);
    }
}

/**
 *
 * @return non zero if the loop filter can be skipped
 */
1769
static int fill_filter_caches(const H264Context *h, H264SliceContext *sl, int mb_type)
1770
{
1771
    const int mb_xy = sl->mb_xy;
1772 1773 1774 1775 1776
    int top_xy, left_xy[LEFT_MBS];
    int top_type, left_type[LEFT_MBS];
    uint8_t *nnz;
    uint8_t *nnz_cache;

1777
    top_xy = mb_xy - (h->mb_stride << MB_FIELD(sl));
1778 1779 1780 1781 1782 1783 1784 1785

    /* Wow, what a mess, why didn't they simplify the interlacing & intra
     * stuff, I can't imagine that these complex rules are worth it. */

    left_xy[LBOT] = left_xy[LTOP] = mb_xy - 1;
    if (FRAME_MBAFF(h)) {
        const int left_mb_field_flag = IS_INTERLACED(h->cur_pic.mb_type[mb_xy - 1]);
        const int curr_mb_field_flag = IS_INTERLACED(mb_type);
1786
        if (sl->mb_y & 1) {
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
            if (left_mb_field_flag != curr_mb_field_flag)
                left_xy[LTOP] -= h->mb_stride;
        } else {
            if (curr_mb_field_flag)
                top_xy += h->mb_stride &
                          (((h->cur_pic.mb_type[top_xy] >> 7) & 1) - 1);
            if (left_mb_field_flag != curr_mb_field_flag)
                left_xy[LBOT] += h->mb_stride;
        }
    }

1798 1799 1800
    sl->top_mb_xy        = top_xy;
    sl->left_mb_xy[LTOP] = left_xy[LTOP];
    sl->left_mb_xy[LBOT] = left_xy[LBOT];
1801 1802 1803 1804
    {
        /* For sufficiently low qp, filtering wouldn't do anything.
         * This is a conservative estimate: could also check beta_offset
         * and more accurate chroma_qp. */
1805
        int qp_thresh = sl->qp_thresh; // FIXME strictly we should store qp_thresh for each mb of a slice
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824
        int qp        = h->cur_pic.qscale_table[mb_xy];
        if (qp <= qp_thresh &&
            (left_xy[LTOP] < 0 ||
             ((qp + h->cur_pic.qscale_table[left_xy[LTOP]] + 1) >> 1) <= qp_thresh) &&
            (top_xy < 0 ||
             ((qp + h->cur_pic.qscale_table[top_xy] + 1) >> 1) <= qp_thresh)) {
            if (!FRAME_MBAFF(h))
                return 1;
            if ((left_xy[LTOP] < 0 ||
                 ((qp + h->cur_pic.qscale_table[left_xy[LBOT]] + 1) >> 1) <= qp_thresh) &&
                (top_xy < h->mb_stride ||
                 ((qp + h->cur_pic.qscale_table[top_xy - h->mb_stride] + 1) >> 1) <= qp_thresh))
                return 1;
        }
    }

    top_type        = h->cur_pic.mb_type[top_xy];
    left_type[LTOP] = h->cur_pic.mb_type[left_xy[LTOP]];
    left_type[LBOT] = h->cur_pic.mb_type[left_xy[LBOT]];
1825
    if (sl->deblocking_filter == 2) {
1826
        if (h->slice_table[top_xy] != sl->slice_num)
1827
            top_type = 0;
1828
        if (h->slice_table[left_xy[LBOT]] != sl->slice_num)
1829 1830 1831 1832 1833 1834 1835
            left_type[LTOP] = left_type[LBOT] = 0;
    } else {
        if (h->slice_table[top_xy] == 0xFFFF)
            top_type = 0;
        if (h->slice_table[left_xy[LBOT]] == 0xFFFF)
            left_type[LTOP] = left_type[LBOT] = 0;
    }
1836 1837 1838
    sl->top_type        = top_type;
    sl->left_type[LTOP] = left_type[LTOP];
    sl->left_type[LBOT] = left_type[LBOT];
1839 1840 1841 1842

    if (IS_INTRA(mb_type))
        return 0;

1843
    fill_filter_caches_inter(h, sl, mb_type, top_xy, left_xy,
1844
                             top_type, left_type, mb_xy, 0);
1845
    if (sl->list_count == 2)
1846
        fill_filter_caches_inter(h, sl, mb_type, top_xy, left_xy,
1847 1848 1849
                                 top_type, left_type, mb_xy, 1);

    nnz       = h->non_zero_count[mb_xy];
1850
    nnz_cache = sl->non_zero_count_cache;
1851 1852 1853 1854
    AV_COPY32(&nnz_cache[4 + 8 * 1], &nnz[0]);
    AV_COPY32(&nnz_cache[4 + 8 * 2], &nnz[4]);
    AV_COPY32(&nnz_cache[4 + 8 * 3], &nnz[8]);
    AV_COPY32(&nnz_cache[4 + 8 * 4], &nnz[12]);
1855
    sl->cbp = h->cbp_table[mb_xy];
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

    if (top_type) {
        nnz = h->non_zero_count[top_xy];
        AV_COPY32(&nnz_cache[4 + 8 * 0], &nnz[3 * 4]);
    }

    if (left_type[LTOP]) {
        nnz = h->non_zero_count[left_xy[LTOP]];
        nnz_cache[3 + 8 * 1] = nnz[3 + 0 * 4];
        nnz_cache[3 + 8 * 2] = nnz[3 + 1 * 4];
        nnz_cache[3 + 8 * 3] = nnz[3 + 2 * 4];
        nnz_cache[3 + 8 * 4] = nnz[3 + 3 * 4];
    }

    /* CAVLC 8x8dct requires NNZ values for residual decoding that differ
     * from what the loop filter needs */
    if (!CABAC(h) && h->pps.transform_8x8_mode) {
        if (IS_8x8DCT(top_type)) {
            nnz_cache[4 + 8 * 0] =
            nnz_cache[5 + 8 * 0] = (h->cbp_table[top_xy] & 0x4000) >> 12;
            nnz_cache[6 + 8 * 0] =
            nnz_cache[7 + 8 * 0] = (h->cbp_table[top_xy] & 0x8000) >> 12;
        }
        if (IS_8x8DCT(left_type[LTOP])) {
            nnz_cache[3 + 8 * 1] =
            nnz_cache[3 + 8 * 2] = (h->cbp_table[left_xy[LTOP]] & 0x2000) >> 12; // FIXME check MBAFF
        }
        if (IS_8x8DCT(left_type[LBOT])) {
            nnz_cache[3 + 8 * 3] =
            nnz_cache[3 + 8 * 4] = (h->cbp_table[left_xy[LBOT]] & 0x8000) >> 12; // FIXME check MBAFF
        }

        if (IS_8x8DCT(mb_type)) {
            nnz_cache[scan8[0]] =
            nnz_cache[scan8[1]] =
            nnz_cache[scan8[2]] =
1892
            nnz_cache[scan8[3]] = (sl->cbp & 0x1000) >> 12;
1893 1894 1895 1896

            nnz_cache[scan8[0 + 4]] =
            nnz_cache[scan8[1 + 4]] =
            nnz_cache[scan8[2 + 4]] =
1897
            nnz_cache[scan8[3 + 4]] = (sl->cbp & 0x2000) >> 12;
1898 1899 1900 1901

            nnz_cache[scan8[0 + 8]] =
            nnz_cache[scan8[1 + 8]] =
            nnz_cache[scan8[2 + 8]] =
1902
            nnz_cache[scan8[3 + 8]] = (sl->cbp & 0x4000) >> 12;
1903 1904 1905 1906

            nnz_cache[scan8[0 + 12]] =
            nnz_cache[scan8[1 + 12]] =
            nnz_cache[scan8[2 + 12]] =
1907
            nnz_cache[scan8[3 + 12]] = (sl->cbp & 0x8000) >> 12;
1908 1909 1910 1911 1912 1913
        }
    }

    return 0;
}

1914
static void loop_filter(const H264Context *h, H264SliceContext *sl, int start_x, int end_x)
1915 1916 1917
{
    uint8_t *dest_y, *dest_cb, *dest_cr;
    int linesize, uvlinesize, mb_x, mb_y;
1918
    const int end_mb_y       = sl->mb_y + FRAME_MBAFF(h);
1919
    const int old_slice_type = sl->slice_type;
1920 1921 1922
    const int pixel_shift    = h->pixel_shift;
    const int block_h        = 16 >> h->chroma_y_shift;

1923
    if (sl->deblocking_filter) {
1924 1925 1926
        for (mb_x = start_x; mb_x < end_x; mb_x++)
            for (mb_y = end_mb_y - FRAME_MBAFF(h); mb_y <= end_mb_y; mb_y++) {
                int mb_xy, mb_type;
1927
                mb_xy         = sl->mb_xy = mb_x + mb_y * h->mb_stride;
1928
                sl->slice_num = h->slice_table[mb_xy];
1929
                mb_type       = h->cur_pic.mb_type[mb_xy];
1930
                sl->list_count = h->list_counts[mb_xy];
1931 1932

                if (FRAME_MBAFF(h))
1933
                    sl->mb_mbaff               =
1934
                    sl->mb_field_decoding_flag = !!IS_INTERLACED(mb_type);
1935

1936 1937
                sl->mb_x = mb_x;
                sl->mb_y = mb_y;
1938
                dest_y  = h->cur_pic.f->data[0] +
1939
                          ((mb_x << pixel_shift) + mb_y * sl->linesize) * 16;
1940
                dest_cb = h->cur_pic.f->data[1] +
1941
                          (mb_x << pixel_shift) * (8 << CHROMA444(h)) +
1942
                          mb_y * sl->uvlinesize * block_h;
1943
                dest_cr = h->cur_pic.f->data[2] +
1944
                          (mb_x << pixel_shift) * (8 << CHROMA444(h)) +
1945
                          mb_y * sl->uvlinesize * block_h;
1946 1947
                // FIXME simplify above

1948
                if (MB_FIELD(sl)) {
1949 1950
                    linesize   = sl->mb_linesize   = sl->linesize   * 2;
                    uvlinesize = sl->mb_uvlinesize = sl->uvlinesize * 2;
1951
                    if (mb_y & 1) { // FIXME move out of this function?
1952 1953 1954
                        dest_y  -= sl->linesize   * 15;
                        dest_cb -= sl->uvlinesize * (block_h - 1);
                        dest_cr -= sl->uvlinesize * (block_h - 1);
1955 1956
                    }
                } else {
1957 1958
                    linesize   = sl->mb_linesize   = sl->linesize;
                    uvlinesize = sl->mb_uvlinesize = sl->uvlinesize;
1959
                }
1960
                backup_mb_border(h, sl, dest_y, dest_cb, dest_cr, linesize,
1961
                                 uvlinesize, 0);
1962
                if (fill_filter_caches(h, sl, mb_type))
1963
                    continue;
1964 1965
                sl->chroma_qp[0] = get_chroma_qp(h, 0, h->cur_pic.qscale_table[mb_xy]);
                sl->chroma_qp[1] = get_chroma_qp(h, 1, h->cur_pic.qscale_table[mb_xy]);
1966 1967

                if (FRAME_MBAFF(h)) {
1968
                    ff_h264_filter_mb(h, sl, mb_x, mb_y, dest_y, dest_cb, dest_cr,
1969 1970
                                      linesize, uvlinesize);
                } else {
1971
                    ff_h264_filter_mb_fast(h, sl, mb_x, mb_y, dest_y, dest_cb,
1972 1973 1974 1975
                                           dest_cr, linesize, uvlinesize);
                }
            }
    }
1976
    sl->slice_type  = old_slice_type;
1977 1978
    sl->mb_x         = end_x;
    sl->mb_y         = end_mb_y - FRAME_MBAFF(h);
1979 1980
    sl->chroma_qp[0] = get_chroma_qp(h, 0, sl->qscale);
    sl->chroma_qp[1] = get_chroma_qp(h, 1, sl->qscale);
1981 1982
}

1983
static void predict_field_decoding_flag(const H264Context *h, H264SliceContext *sl)
1984
{
1985
    const int mb_xy = sl->mb_x + sl->mb_y * h->mb_stride;
1986
    int mb_type     = (h->slice_table[mb_xy - 1] == sl->slice_num) ?
1987
                      h->cur_pic.mb_type[mb_xy - 1] :
1988
                      (h->slice_table[mb_xy - h->mb_stride] == sl->slice_num) ?
1989
                      h->cur_pic.mb_type[mb_xy - h->mb_stride] : 0;
1990
    sl->mb_mbaff    = sl->mb_field_decoding_flag = IS_INTERLACED(mb_type) ? 1 : 0;
1991 1992 1993 1994 1995
}

/**
 * Draw edges and report progress for the last MB row.
 */
1996
static void decode_finish_row(const H264Context *h, H264SliceContext *sl)
1997
{
1998
    int top            = 16 * (sl->mb_y      >> FIELD_PICTURE(h));
1999 2000 2001 2002
    int pic_height     = 16 *  h->mb_height >> FIELD_PICTURE(h);
    int height         =  16      << FRAME_MBAFF(h);
    int deblock_border = (16 + 4) << FRAME_MBAFF(h);

2003
    if (sl->deblocking_filter) {
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
        if ((top + height) >= pic_height)
            height += deblock_border;
        top -= deblock_border;
    }

    if (top >= pic_height || (top + height) < 0)
        return;

    height = FFMIN(height, pic_height - top);
    if (top < 0) {
        height = top + height;
        top    = 0;
    }

2018
    ff_h264_draw_horiz_band(h, sl, top, height);
2019 2020 2021 2022 2023 2024 2025 2026

    if (h->droppable)
        return;

    ff_thread_report_progress(&h->cur_pic_ptr->tf, top + height - 1,
                              h->picture_structure == PICT_BOTTOM_FIELD);
}

2027
static void er_add_slice(H264SliceContext *sl,
2028
                         int startx, int starty,
2029 2030 2031
                         int endx, int endy, int status)
{
#if CONFIG_ERROR_RESILIENCE
2032
    ERContext *er = &sl->er;
2033

2034 2035 2036
    if (!sl->h264->enable_er)
        return;

2037
    er->ref_count = sl->ref_count[0];
2038 2039 2040 2041 2042 2043
    ff_er_add_slice(er, startx, starty, endx, endy, status);
#endif
}

static int decode_slice(struct AVCodecContext *avctx, void *arg)
{
2044
    H264SliceContext *sl = arg;
2045
    const H264Context *h = sl->h264;
2046
    int lf_x_start = sl->mb_x;
2047 2048
    int ret;

2049 2050
    sl->linesize   = h->cur_pic_ptr->f->linesize[0];
    sl->uvlinesize = h->cur_pic_ptr->f->linesize[1];
2051 2052

    ret = alloc_scratch_buffers(sl, sl->linesize);
2053 2054
    if (ret < 0)
        return ret;
2055

2056
    sl->mb_skip_run = -1;
2057

2058 2059 2060
    sl->is_complex = FRAME_MBAFF(h) || h->picture_structure != PICT_FRAME ||
                     avctx->codec_id != AV_CODEC_ID_H264 ||
                     (CONFIG_GRAY && (h->flags & CODEC_FLAG_GRAY));
2061 2062 2063

    if (h->pps.cabac) {
        /* realign */
2064
        align_get_bits(&sl->gb);
2065 2066

        /* init cabac */
2067
        ff_init_cabac_decoder(&sl->cabac,
2068 2069
                              sl->gb.buffer + get_bits_count(&sl->gb) / 8,
                              (get_bits_left(&sl->gb) + 7) / 8);
2070

2071
        ff_h264_init_cabac_states(h, sl);
2072 2073 2074

        for (;;) {
            // START_TIMER
2075
            int ret = ff_h264_decode_mb_cabac(h, sl);
2076 2077 2078 2079
            int eos;
            // STOP_TIMER("decode_mb_cabac")

            if (ret >= 0)
2080
                ff_h264_hl_decode_mb(h, sl);
2081 2082 2083

            // FIXME optimal? or let mb_decode decode 16x32 ?
            if (ret >= 0 && FRAME_MBAFF(h)) {
2084
                sl->mb_y++;
2085

2086
                ret = ff_h264_decode_mb_cabac(h, sl);
2087 2088

                if (ret >= 0)
2089
                    ff_h264_hl_decode_mb(h, sl);
2090
                sl->mb_y--;
2091
            }
2092
            eos = get_cabac_terminate(&sl->cabac);
2093 2094

            if ((h->workaround_bugs & FF_BUG_TRUNCATED) &&
2095
                sl->cabac.bytestream > sl->cabac.bytestream_end + 2) {
2096
                er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y, sl->mb_x - 1,
2097 2098 2099
                             sl->mb_y, ER_MB_END);
                if (sl->mb_x >= lf_x_start)
                    loop_filter(h, sl, lf_x_start, sl->mb_x + 1);
2100 2101
                return 0;
            }
2102
            if (ret < 0 || sl->cabac.bytestream > sl->cabac.bytestream_end + 2) {
2103 2104
                av_log(h->avctx, AV_LOG_ERROR,
                       "error while decoding MB %d %d, bytestream %td\n",
2105
                       sl->mb_x, sl->mb_y,
2106
                       sl->cabac.bytestream_end - sl->cabac.bytestream);
2107
                er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y, sl->mb_x,
2108
                             sl->mb_y, ER_MB_ERROR);
2109 2110 2111
                return AVERROR_INVALIDDATA;
            }

2112 2113 2114
            if (++sl->mb_x >= h->mb_width) {
                loop_filter(h, sl, lf_x_start, sl->mb_x);
                sl->mb_x = lf_x_start = 0;
2115
                decode_finish_row(h, sl);
2116
                ++sl->mb_y;
2117
                if (FIELD_OR_MBAFF_PICTURE(h)) {
2118 2119
                    ++sl->mb_y;
                    if (FRAME_MBAFF(h) && sl->mb_y < h->mb_height)
2120
                        predict_field_decoding_flag(h, sl);
2121 2122 2123
                }
            }

2124
            if (eos || sl->mb_y >= h->mb_height) {
2125
                ff_tlog(h->avctx, "slice end %d %d\n",
2126
                        get_bits_count(&sl->gb), sl->gb.size_in_bits);
2127
                er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y, sl->mb_x - 1,
2128 2129 2130
                             sl->mb_y, ER_MB_END);
                if (sl->mb_x > lf_x_start)
                    loop_filter(h, sl, lf_x_start, sl->mb_x);
2131 2132 2133 2134 2135
                return 0;
            }
        }
    } else {
        for (;;) {
2136
            int ret = ff_h264_decode_mb_cavlc(h, sl);
2137 2138

            if (ret >= 0)
2139
                ff_h264_hl_decode_mb(h, sl);
2140 2141 2142

            // FIXME optimal? or let mb_decode decode 16x32 ?
            if (ret >= 0 && FRAME_MBAFF(h)) {
2143
                sl->mb_y++;
2144
                ret = ff_h264_decode_mb_cavlc(h, sl);
2145 2146

                if (ret >= 0)
2147
                    ff_h264_hl_decode_mb(h, sl);
2148
                sl->mb_y--;
2149 2150 2151 2152
            }

            if (ret < 0) {
                av_log(h->avctx, AV_LOG_ERROR,
2153
                       "error while decoding MB %d %d\n", sl->mb_x, sl->mb_y);
2154
                er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y, sl->mb_x,
2155
                             sl->mb_y, ER_MB_ERROR);
2156 2157 2158
                return ret;
            }

2159 2160 2161
            if (++sl->mb_x >= h->mb_width) {
                loop_filter(h, sl, lf_x_start, sl->mb_x);
                sl->mb_x = lf_x_start = 0;
2162
                decode_finish_row(h, sl);
2163
                ++sl->mb_y;
2164
                if (FIELD_OR_MBAFF_PICTURE(h)) {
2165 2166
                    ++sl->mb_y;
                    if (FRAME_MBAFF(h) && sl->mb_y < h->mb_height)
2167
                        predict_field_decoding_flag(h, sl);
2168
                }
2169
                if (sl->mb_y >= h->mb_height) {
2170
                    ff_tlog(h->avctx, "slice end %d %d\n",
2171
                            get_bits_count(&sl->gb), sl->gb.size_in_bits);
2172

2173
                    if (get_bits_left(&sl->gb) == 0) {
2174
                        er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y,
2175
                                     sl->mb_x - 1, sl->mb_y, ER_MB_END);
2176 2177 2178

                        return 0;
                    } else {
2179
                        er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y,
2180
                                     sl->mb_x - 1, sl->mb_y, ER_MB_END);
2181 2182 2183 2184 2185 2186

                        return AVERROR_INVALIDDATA;
                    }
                }
            }

2187
            if (get_bits_left(&sl->gb) <= 0 && sl->mb_skip_run <= 0) {
2188
                ff_tlog(h->avctx, "slice end %d %d\n",
2189
                        get_bits_count(&sl->gb), sl->gb.size_in_bits);
2190

2191
                if (get_bits_left(&sl->gb) == 0) {
2192
                    er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y,
2193 2194 2195
                                 sl->mb_x - 1, sl->mb_y, ER_MB_END);
                    if (sl->mb_x > lf_x_start)
                        loop_filter(h, sl, lf_x_start, sl->mb_x);
2196 2197 2198

                    return 0;
                } else {
2199
                    er_add_slice(sl, sl->resync_mb_x, sl->resync_mb_y, sl->mb_x,
2200
                                 sl->mb_y, ER_MB_ERROR);
2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217

                    return AVERROR_INVALIDDATA;
                }
            }
        }
    }
}

/**
 * Call decode_slice() for each context.
 *
 * @param h h264 master context
 * @param context_count number of contexts to execute
 */
int ff_h264_execute_decode_slices(H264Context *h, unsigned context_count)
{
    AVCodecContext *const avctx = h->avctx;
2218
    H264SliceContext *sl;
2219 2220 2221 2222 2223
    int i;

    if (h->avctx->hwaccel)
        return 0;
    if (context_count == 1) {
2224 2225 2226
        int ret = decode_slice(avctx, &h->slice_ctx[0]);
        h->mb_y = h->slice_ctx[0].mb_y;
        return ret;
2227 2228
    } else {
        for (i = 1; i < context_count; i++) {
2229 2230
            sl                 = &h->slice_ctx[i];
            sl->er.error_count = 0;
2231 2232
        }

2233 2234
        avctx->execute(avctx, decode_slice, h->slice_ctx,
                       NULL, context_count, sizeof(h->slice_ctx[0]));
2235 2236

        /* pull back stuff from slices to master context */
2237 2238
        sl                   = &h->slice_ctx[context_count - 1];
        h->mb_y              = sl->mb_y;
2239
        for (i = 1; i < context_count; i++)
2240
            h->slice_ctx[0].er.error_count += h->slice_ctx[i].er.error_count;
2241 2242 2243 2244
    }

    return 0;
}