Function cllc_decode_frame

libavcodec/cllc.c:359–467

}

static int cllc_decode_frame(AVCodecContext *avctx, AVFrame *pic,
                             int *got_picture_ptr, AVPacket *avpkt)
{
    CLLCContext *ctx = avctx->priv_data;
    const uint8_t *src = avpkt->data;
    uint32_t info_tag, info_offset;
    int data_size;
    GetBitContext gb;
    int coding_type, ret;

    if (avpkt->size < 4 + 4) {
        av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
        return AVERROR_INVALIDDATA;
    }

    info_offset = 0;
    info_tag    = AV_RL32(src);
    if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
        info_offset = AV_RL32(src + 4);
        if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
                   info_offset);
            return AVERROR_INVALIDDATA;
        }
        ff_canopus_parse_info_tag(avctx, src + 8, info_offset);

        info_offset += 8;
        src         += info_offset;
    }

    data_size = (avpkt->size - info_offset) & ~1;

    /* Make sure our bswap16'd buffer is big enough */
    av_fast_padded_malloc(&ctx->swapped_buf,
                          &ctx->swapped_buf_size, data_size);
    if (!ctx->swapped_buf) {
        av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
        return AVERROR(ENOMEM);
    }

    /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
    ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
                          data_size / 2);

    if ((ret = init_get_bits8(&gb, ctx->swapped_buf, data_size)) < 0)
        return ret;

    /*
     * Read in coding type. The types are as follows:
     *
     * 0 - YUY2
     * 1 - BGR24 (Triples)
     * 2 - BGR24 (Quads)
     * 3 - BGRA
     */
    coding_type = (AV_RL32(src) >> 8) & 0xFF;
    av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);