void AVDemuxThread::stepForward()
{
if (end)
return;
// clock type will be wrong if no lock because slot frameDeliveredOnStepForward() is in video thread
QMutexLocker locker(&next_frame_mutex);
Q_UNUSED(locker);
pause(true); // must pause AVDemuxThread (set user_paused true)
AVThread* av[] = {video_thread, audio_thread};
bool connected = false;
for (size_t i = 0; i < sizeof(av)/sizeof(av[0]); ++i) {
AVThread *t = av[i];
if (!t)
continue;
// set clock first
if (clock_type < 0)
clock_type = (int)t->clock()->isClockAuto() + 2*(int)t->clock()->clockType();
t->clock()->setClockType(AVClock::VideoClock);
t->scheduleFrameDrop(false);
t->pause(false);
t->packetQueue()->blockFull(false);
if (!connected) {
connect(t, SIGNAL(frameDelivered()), this, SLOT(frameDeliveredOnStepForward()), Qt::DirectConnection);
connect(t, SIGNAL(eofDecoded()), this, SLOT(eofDecodedOnStepForward()), Qt::DirectConnection);
connected = true;
}
}
Q_EMIT requestClockPause(false);
pauseInternal(false);
}
void AVDemuxThread::frameDeliveredOnStepForward()
{
AVThread *thread = video_thread ? video_thread : audio_thread;
Q_ASSERT(thread);
QMutexLocker locker(&next_frame_mutex);
Q_UNUSED(locker);
disconnect(thread, SIGNAL(frameDelivered()), this, SLOT(frameDeliveredOnStepForward()));
disconnect(thread, SIGNAL(eofDecoded()), this, SLOT(eofDecodedOnStepForward()));
if (user_paused) {
pause(true); // restore pause state
Q_EMIT requestClockPause(true); // need direct connection
// pause both video and audio thread
if (video_thread)
video_thread->pause(true);
if (audio_thread)
audio_thread->pause(true);
}
if (clock_type >= 0) {
thread->clock()->setClockAuto(clock_type & 1);
thread->clock()->setClockType(AVClock::ClockType(clock_type/2));
clock_type = -1;
thread->clock()->updateExternalClock((thread->previousHistoryPts() - thread->clock()->initialValue())*1000.0);
}
Q_EMIT stepFinished();
}
void AVDemuxThread::eofDecodedOnStepForward()
{
AVThread *thread = video_thread ? video_thread : audio_thread;
Q_ASSERT(thread);
QMutexLocker locker(&next_frame_mutex);
Q_UNUSED(locker);
disconnect(thread, SIGNAL(frameDelivered()), this, SLOT(frameDeliveredOnStepForward()));
disconnect(thread, SIGNAL(eofDecoded()), this, SLOT(eofDecodedOnStepForward()));
pause(false);
end = true;
if (clock_type >= 0) {
thread->clock()->setClockAuto(clock_type & 1);
thread->clock()->setClockType(AVClock::ClockType(clock_type/2));
clock_type = -1;
}
}