Function webm_chunk_write_packet

libavformat/webm_chunk.c:212–242

}

static int webm_chunk_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    WebMChunkContext *wc = s->priv_data;
    AVFormatContext *oc = wc->avf;
    AVStream *st = s->streams[pkt->stream_index];
    int ret;

    if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
        if (wc->prev_pts != AV_NOPTS_VALUE)
            wc->duration_written += av_rescale_q(pkt->pts - wc->prev_pts,
                                                 st->time_base,
                                                 (AVRational) {1, 1000});
        wc->prev_pts = pkt->pts;
    }

    // For video, a new chunk is started only on key frames. For audio, a new
    // chunk is started based on chunk_duration. Also, a new chunk is started
    // unconditionally if there is no currently open chunk.
    if (!oc->pb || (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
         (pkt->flags & AV_PKT_FLAG_KEY)) ||
        (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
         wc->duration_written >= wc->chunk_duration)) {
        wc->duration_written = 0;
        if ((ret = chunk_end(s, 1)) < 0 || (ret = chunk_start(s)) < 0) {
            return ret;
        }
    }

    // We only have one stream, so use the non-interleaving av_write_frame.
    return av_write_frame(oc, pkt);
}

static int webm_chunk_write_trailer(AVFormatContext *s)
{