Function seq_read_packet

libavformat/tiertexseq.c:240–292

}

static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int rc;
    SeqDemuxContext *seq = s->priv_data;
    ByteIOContext *pb = s->pb;

    if (!seq->audio_buffer_full) {
        rc = seq_parse_frame_data(seq, pb);
        if (rc)
            return rc;

        /* video packet */
        if (seq->current_pal_data_size + seq->current_video_data_size != 0) {
            if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
                return AVERROR(ENOMEM);

            pkt->data[0] = 0;
            if (seq->current_pal_data_size) {
                pkt->data[0] |= 1;
                url_fseek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
                if (get_buffer(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
                    return AVERROR(EIO);
            }
            if (seq->current_video_data_size) {
                pkt->data[0] |= 2;
                memcpy(&pkt->data[1 + seq->current_pal_data_size],
                  seq->current_video_data_ptr,
                  seq->current_video_data_size);
            }
            pkt->stream_index = seq->video_stream_index;
            pkt->pts = seq->current_frame_pts;

            /* sound buffer will be processed on next read_packet() call */
            seq->audio_buffer_full = 1;
            return 0;
       }
    }

    /* audio packet */
    if (seq->current_audio_data_offs == 0) /* end of data reached */
        return AVERROR(EIO);

    url_fseek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
    rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
    if (rc < 0)
        return rc;

    pkt->stream_index = seq->audio_stream_index;
    seq->current_frame_pts++;

    seq->audio_buffer_full = 0;
    return 0;
}

static int seq_read_close(AVFormatContext *s)
{