Function ff_flv_decode_picture_header

libavcodec/flvdec.c:29–108

#include "mpegvideodec.h"

int ff_flv_decode_picture_header(H263DecContext *const h)
{
    int format, width, height;

    /* picture header */
    if (get_bits(&h->gb, 17) != 1) {
        av_log(h->c.avctx, AV_LOG_ERROR, "Bad picture start code\n");
        return AVERROR_INVALIDDATA;
    }
    format = get_bits(&h->gb, 5);
    if (format != 0 && format != 1) {
        av_log(h->c.avctx, AV_LOG_ERROR, "Bad picture format\n");
        return AVERROR_INVALIDDATA;
    }
    h->flv            = format;
    h->picture_number = get_bits(&h->gb, 8); /* picture timestamp */
    format            = get_bits(&h->gb, 3);
    switch (format) {
    case 0:
        width  = get_bits(&h->gb, 8);
        height = get_bits(&h->gb, 8);
        break;
    case 1:
        width  = get_bits(&h->gb, 16);
        height = get_bits(&h->gb, 16);
        break;
    case 2:
        width  = 352;
        height = 288;
        break;
    case 3:
        width  = 176;
        height = 144;
        break;
    case 4:
        width  = 128;
        height = 96;
        break;
    case 5:
        width  = 320;
        height = 240;
        break;
    case 6:
        width  = 160;
        height = 120;
        break;
    default:
        width = height = 0;
        break;
    }
    if (av_image_check_size(width, height, 0, h->c.avctx))
        return AVERROR(EINVAL);
    h->c.width  = width;
    h->c.height = height;

    h->c.pict_type = AV_PICTURE_TYPE_I + get_bits(&h->gb, 2);
    h->c.droppable = h->c.pict_type > AV_PICTURE_TYPE_P;
    if (h->c.droppable)