C++ PacketBuffer::clear方法代码示例

void AVDemuxThread::run()
{
    m_buffering = false;
    end = false;
    if (audio_thread && !audio_thread->isRunning())
        audio_thread->start(QThread::HighPriority);
    if (video_thread && !video_thread->isRunning())
        video_thread->start();

    int stream = 0;
    Packet pkt;
    pause(false);
    qDebug("get av queue a/v thread = %p %p", audio_thread, video_thread);
    PacketBuffer *aqueue = audio_thread ? audio_thread->packetQueue() : 0;
    PacketBuffer *vqueue = video_thread ? video_thread->packetQueue() : 0;
    // aqueue as a primary buffer: music with/without cover
    AVThread* thread = !video_thread || (audio_thread && demuxer->hasAttacedPicture()) ? audio_thread : video_thread;
    m_buffer = thread->packetQueue();
    const qint64 buf2 = aqueue ? aqueue->bufferValue() : 1; // TODO: may be changed by user. Deal with audio track change
    if (aqueue) {
        aqueue->clear();
        aqueue->setBlocking(true);
    }
    if (vqueue) {
        vqueue->clear();
        vqueue->setBlocking(true);
    }
    connect(thread, SIGNAL(seekFinished(qint64)), this, SIGNAL(seekFinished(qint64)), Qt::DirectConnection);
    connect(thread, SIGNAL(eofDecoded()), this, SLOT(eofDecoded()));
    seek_tasks.clear();
    int was_end = 0;
    if (ademuxer) {
        ademuxer->seek(0LL);
    }
    qreal last_apts = 0;
    qreal last_vpts = 0;

    AutoSem as(&sem);
    Q_UNUSED(as);
    while (!end) {
        processNextSeekTask();
        //vthread maybe changed by AVPlayer.setPriority() from no dec case
        vqueue = video_thread ? video_thread->packetQueue() : 0;
        if (demuxer->atEnd()) {
            // if avthread may skip 1st eof packet because of a/v sync
            const int kMaxEof = 1;//if buffer packet, we can use qMax(aqueue->bufferValue(), vqueue->bufferValue()) and not call blockEmpty(false);
            if (aqueue && (!was_end || aqueue->isEmpty())) {
                if (was_end < kMaxEof)
                    aqueue->put(Packet::createEOF());
                const qreal dpts = last_vpts - last_apts;
                if (dpts > 0.1) {
                    Packet fake_apkt;
                    fake_apkt.duration = last_vpts - qMin(thread->clock()->videoTime(), thread->clock()->value()); // FIXME: when clock value < 0?
                    qDebug("audio is too short than video: %.3f, fake_apkt.duration: %.3f", dpts, fake_apkt.duration);
                    last_apts = last_vpts = 0; // if not reset to 0, for example real eof pts, then no fake apkt after seek because dpts < 0
                    aqueue->put(fake_apkt);
                }
                aqueue->blockEmpty(was_end >= kMaxEof); // do not block if buffer is not enough. block again on seek
            }
            if (vqueue && (!was_end || vqueue->isEmpty())) {
                if (was_end < kMaxEof)
                    vqueue->put(Packet::createEOF());
                vqueue->blockEmpty(was_end >= kMaxEof);
            }
            if (m_buffering) {
                m_buffering = false;
                Q_EMIT mediaStatusChanged(QtAV::BufferedMedia);
                Q_EMIT mediaStatusChanged(QtAV::EndOfMedia);
            }
            was_end = qMin(was_end + 1, kMaxEof);
            bool exit_thread = !user_paused;
            if (aqueue)
                exit_thread &= aqueue->isEmpty();
            if (vqueue)
                exit_thread &= vqueue->isEmpty();
            if (exit_thread) {
                if (!(mediaEndAction() & MediaEndAction_Pause))
                    break;
                pause(true);
                Q_EMIT requestClockPause(true);
                if (aqueue)
                    aqueue->blockEmpty(true);
                if (vqueue)
                    vqueue->blockEmpty(true);
            }
            // wait for a/v thread finished
            msleep(100);
            continue;
        }
        was_end = 0;
        if (tryPause()) {
            continue; //the queue is empty and will block
        }
        updateBufferState();
        if (!demuxer->readFrame()) {
            continue;
        }
        stream = demuxer->stream();
        pkt = demuxer->packet();
        Packet apkt;
//.........这里部分代码省略.........