Function decode_picture_header

libavcodec/proresdec.c:315–421

}

static int decode_picture_header(AVCodecContext *avctx, const uint8_t *buf, const int buf_size)
{
    ProresContext *ctx = avctx->priv_data;
    int i, hdr_size, slice_count;
    unsigned pic_data_size;
    int log2_slice_mb_width, log2_slice_mb_height;
    int slice_mb_count, mb_x, mb_y;
    const uint8_t *data_ptr, *index_ptr;

    hdr_size = buf[0] >> 3;
    if (hdr_size < 8 || hdr_size > buf_size) {
        av_log(avctx, AV_LOG_ERROR, "error, wrong picture header size\n");
        return AVERROR_INVALIDDATA;
    }

    pic_data_size = AV_RB32(buf + 1);
    if (pic_data_size > buf_size) {
        av_log(avctx, AV_LOG_ERROR, "error, wrong picture data size\n");
        return AVERROR_INVALIDDATA;
    }

    log2_slice_mb_width  = buf[7] >> 4;
    log2_slice_mb_height = buf[7] & 0xF;
    if (log2_slice_mb_width > 3 || log2_slice_mb_height) {
        av_log(avctx, AV_LOG_ERROR, "unsupported slice resolution: %dx%d\n",
               1 << log2_slice_mb_width, 1 << log2_slice_mb_height);
        return AVERROR_INVALIDDATA;
    }

    ctx->slice_mb_width  = 1 << log2_slice_mb_width;
    ctx->slice_mb_height = 1 << log2_slice_mb_height;

    ctx->mb_width  = (avctx->width  + 15) >> 4;
    if (ctx->frame_type)
        ctx->mb_height = (avctx->height + 31) >> 5;
    else
        ctx->mb_height = (avctx->height + 15) >> 4;

    // QT ignores the written value
    // slice_count = AV_RB16(buf + 5);
    slice_count = ctx->mb_height * ((ctx->mb_width >> log2_slice_mb_width) +
                                    av_popcount(ctx->mb_width & ctx->slice_mb_width - 1));

    if (ctx->slice_count != slice_count || !ctx->slices) {
        av_freep(&ctx->slices);
        ctx->slice_count = 0;
        ctx->slices = av_calloc(slice_count, sizeof(*ctx->slices));
        if (!ctx->slices)
            return AVERROR(ENOMEM);
        ctx->slice_count = slice_count;
    }

    if (!slice_count)
        return AVERROR(EINVAL);

    if (hdr_size + slice_count*2 > buf_size) {
        av_log(avctx, AV_LOG_ERROR, "error, wrong slice count\n");
        return AVERROR_INVALIDDATA;