roqvideodec.c 8.99 KB
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/*
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 * Copyright (c) 2003 The FFmpeg Project
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * id RoQ Video Decoder by Dr. Tim Ferguson
 * For more information about the id RoQ format, visit:
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 *   http://www.csse.monash.edu.au/~timf/
 */

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#include "libavutil/avassert.h"
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#include "avcodec.h"
#include "bytestream.h"
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#include "internal.h"
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#include "roqvideo.h"

static void roqvideo_decode_frame(RoqContext *ri)
{
    unsigned int chunk_id = 0, chunk_arg = 0;
    unsigned long chunk_size = 0;
    int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
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    int vqid, xpos, ypos, xp, yp, x, y, mx, my;
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    int frame_stats[2][4] = {{0},{0}};
    roq_qcell *qcell;
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    int64_t chunk_start;
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    while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
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        chunk_id   = bytestream2_get_le16(&ri->gb);
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        chunk_size = bytestream2_get_le32(&ri->gb);
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        chunk_arg  = bytestream2_get_le16(&ri->gb);
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        if(chunk_id == RoQ_QUAD_VQ)
            break;
        if(chunk_id == RoQ_QUAD_CODEBOOK) {
            if((nv1 = chunk_arg >> 8) == 0)
                nv1 = 256;
            if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
                nv2 = 256;
            for(i = 0; i < nv1; i++) {
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                ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
                ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
                ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
                ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
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                ri->cb2x2[i].u    = bytestream2_get_byte(&ri->gb);
                ri->cb2x2[i].v    = bytestream2_get_byte(&ri->gb);
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            }
            for(i = 0; i < nv2; i++)
                for(j = 0; j < 4; j++)
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                    ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
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        }
    }

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    chunk_start = bytestream2_tell(&ri->gb);
    xpos = ypos = 0;
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    if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
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        av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
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        chunk_size = bytestream2_get_bytes_left(&ri->gb);
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    }
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    while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
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        for (yp = ypos; yp < ypos + 16; yp += 8)
            for (xp = xpos; xp < xpos + 16; xp += 8) {
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                if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
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                    av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
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                    return;
                }
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                if (vqflg_pos < 0) {
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                    vqflg = bytestream2_get_le16(&ri->gb);
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                    vqflg_pos = 7;
                }
                vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
                frame_stats[0][vqid]++;
                vqflg_pos--;

                switch(vqid) {
                case RoQ_ID_MOT:
                    break;
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                case RoQ_ID_FCC: {
                    int byte = bytestream2_get_byte(&ri->gb);
                    mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
                    my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
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                    ff_apply_motion_8x8(ri, xp, yp, mx, my);
                    break;
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                }
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                case RoQ_ID_SLD:
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                    qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
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                    ff_apply_vector_4x4(ri, xp,     yp,     ri->cb2x2 + qcell->idx[0]);
                    ff_apply_vector_4x4(ri, xp + 4, yp,     ri->cb2x2 + qcell->idx[1]);
                    ff_apply_vector_4x4(ri, xp,     yp + 4, ri->cb2x2 + qcell->idx[2]);
                    ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
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                    break;
                case RoQ_ID_CCC:
                    for (k = 0; k < 4; k++) {
                        x = xp; y = yp;
                        if(k & 0x01) x += 4;
                        if(k & 0x02) y += 4;

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                        if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
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                            av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n");
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                            return;
                        }
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                        if (vqflg_pos < 0) {
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                            vqflg = bytestream2_get_le16(&ri->gb);
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                            vqflg_pos = 7;
                        }
                        vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
                        frame_stats[1][vqid]++;
                        vqflg_pos--;
                        switch(vqid) {
                        case RoQ_ID_MOT:
                            break;
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                        case RoQ_ID_FCC: {
                            int byte = bytestream2_get_byte(&ri->gb);
                            mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
                            my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
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                            ff_apply_motion_4x4(ri, x, y, mx, my);
                            break;
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                        }
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                        case RoQ_ID_SLD:
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                            qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
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                            ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + qcell->idx[0]);
                            ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + qcell->idx[1]);
                            ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + qcell->idx[2]);
                            ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
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                            break;
                        case RoQ_ID_CCC:
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                            ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
                            ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
                            ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
                            ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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                            break;
                        }
                    }
                    break;
                default:
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                    av_assert2(0);
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            }
        }

        xpos += 16;
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        if (xpos >= ri->width) {
            xpos -= ri->width;
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            ypos += 16;
        }
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        if(ypos >= ri->height)
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            break;
    }
}


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static av_cold int roq_decode_init(AVCodecContext *avctx)
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{
    RoqContext *s = avctx->priv_data;

    s->avctx = avctx;
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    if (avctx->width % 16 || avctx->height % 16) {
        av_log(avctx, AV_LOG_ERROR,
               "Dimensions must be a multiple of 16\n");
        return AVERROR_PATCHWELCOME;
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    }

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    s->width = avctx->width;
    s->height = avctx->height;
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    s->last_frame    = av_frame_alloc();
    s->current_frame = av_frame_alloc();
    if (!s->current_frame || !s->last_frame) {
        av_frame_free(&s->current_frame);
        av_frame_free(&s->last_frame);
        return AVERROR(ENOMEM);
    }

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    avctx->pix_fmt = AV_PIX_FMT_YUVJ444P;
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    avctx->color_range = AVCOL_RANGE_JPEG;
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    return 0;
}

static int roq_decode_frame(AVCodecContext *avctx,
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                            void *data, int *got_frame,
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                            AVPacket *avpkt)
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{
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    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
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    RoqContext *s = avctx->priv_data;
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    int copy= !s->current_frame->data[0];
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    int ret;
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    if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
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        return ret;
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    if(copy)
        av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
                        avctx->pix_fmt, avctx->width, avctx->height);

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    bytestream2_init(&s->gb, buf, buf_size);
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    roqvideo_decode_frame(s);

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    if ((ret = av_frame_ref(data, s->current_frame)) < 0)
        return ret;
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    *got_frame      = 1;
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    /* shuffle frames */
    FFSWAP(AVFrame *, s->current_frame, s->last_frame);

    return buf_size;
}

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static av_cold int roq_decode_end(AVCodecContext *avctx)
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{
    RoqContext *s = avctx->priv_data;

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    av_frame_free(&s->current_frame);
    av_frame_free(&s->last_frame);
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    return 0;
}

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AVCodec ff_roq_decoder = {
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    .name           = "roqvideo",
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    .long_name      = NULL_IF_CONFIG_SMALL("id RoQ video"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_ROQ,
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    .priv_data_size = sizeof(RoqContext),
    .init           = roq_decode_init,
    .close          = roq_decode_end,
    .decode         = roq_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
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};