Function decode_packet

libavcodec/wmaprodec.c:1616–1807

}

static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s,
                         AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
{
    GetBitContext* gb  = &s->pgb;
    const uint8_t* buf = avpkt->data;
    int buf_size       = avpkt->size;
    int num_bits_prev_frame;
    int packet_sequence_number;
    int ret;

    *got_frame_ptr = 0;

    if (!buf_size) {
        int i;

        /** Must output remaining samples after stream end. WMAPRO 5.1 created
         * by XWMA encoder don't though (maybe only 1/2ch streams need it). */
        s->packet_done = 0;
        if (s->eof_done)
            return 0;

        /** clean output buffer and copy last IMDCT samples */
        for (i = 0; i < s->nb_channels; i++) {
            memset(frame->extended_data[i], 0,
            s->samples_per_frame * sizeof(*s->channel[i].out));

            memcpy(frame->extended_data[i], s->channel[i].out,
                   s->samples_per_frame * sizeof(*s->channel[i].out) >> 1);
        }

        s->eof_done = 1;
        s->packet_done = 1;
        *got_frame_ptr = 1;
        return 0;
    }
    else if (s->packet_done || s->packet_loss) {
        s->packet_done = 0;

        /** sanity check for the buffer length */
        if (avctx->codec_id == AV_CODEC_ID_WMAPRO && buf_size < avctx->block_align) {
            av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n",
                   buf_size, avctx->block_align);
            s->packet_loss = 1;
            return AVERROR_INVALIDDATA;
        }

        if (avctx->codec_id == AV_CODEC_ID_WMAPRO) {
            s->next_packet_start = buf_size - avctx->block_align;
            buf_size = avctx->block_align;
        } else {
            s->next_packet_start = buf_size - FFMIN(buf_size, avctx->block_align);
            buf_size = FFMIN(buf_size, avctx->block_align);
        }
        s->buf_bit_size = buf_size << 3;

        /** parse packet header */
        ret = init_get_bits8(gb, buf, buf_size);
        if (ret < 0)