void AVDemuxThread::stepBackward()
{
if (!video_thread)
return;
AVThread *t = video_thread;
const qreal pre_pts = video_thread->previousHistoryPts();
if (pre_pts == 0.0) {
qWarning("can not get previous pts");
return;
}
end = false;
// queue maybe blocked by put()
if (audio_thread) {
audio_thread->packetQueue()->clear(); // will put new packets before task run
}
class stepBackwardTask : public QRunnable {
public:
stepBackwardTask(AVDemuxThread *dt, qreal t)
: demux_thread(dt)
, pts(t)
{}
void run() {
AVThread *avt = demux_thread->videoThread();
avt->packetQueue()->clear(); // clear here
if (pts <= 0) {
demux_thread->demuxer->seek(qint64(-pts*1000.0) - 1000LL);
QVector<qreal> ts;
qreal t = -1.0;
while (t < -pts) {
demux_thread->demuxer->readFrame();
if (demux_thread->demuxer->stream() != demux_thread->demuxer->videoStream())
continue;
t = demux_thread->demuxer->packet().pts;
ts.push_back(t);
}
ts.pop_back();
pts = ts.back();
// FIXME: sometimes can not seek to the previous pts, the result pts is always current pts
}
qDebug("step backward: %lld, %f", qint64(pts*1000.0), pts);
demux_thread->video_thread->setDropFrameOnSeek(false);
demux_thread->seekInternal(qint64(pts*1000.0), AccurateSeek);
}
private:
AVDemuxThread *demux_thread;
qreal pts;
};
pause(true);
t->packetQueue()->clear(); // will put new packets before task run
t->packetQueue();
Packet pkt;
pkt.pts = pre_pts;
t->packetQueue()->put(pkt); // clear and put a seek packet to ensure not frames other than previous frame will be decoded and rendered
video_thread->pause(false);
newSeekRequest(new stepBackwardTask(this, pre_pts));
}
virtual void call() {
if (!mDemuxThread)
return;
if (mDemuxThread->isEnd())
return;
mDemuxThread->updateBufferState(); // ensure detect buffering immediately
AVThread *thread = mDemuxThread->videoThread();
//qDebug("try wake up video queue");
if (thread)
thread->packetQueue()->blockFull(false);
//qDebug("try wake up audio queue");
thread = mDemuxThread->audioThread();
if (thread)
thread->packetQueue()->blockFull(false);
}
void AVDemuxThread::nextFrame()
{
// clock type will be wrong if no lock because slot frameDeliveredNextFrame() 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(frameDeliveredNextFrame()), Qt::DirectConnection);
connected = true;
}
}
emit requestClockPause(false);
nb_next_frame.ref();
pauseInternal(false);
}
void run() {
AVThread *avt = demux_thread->videoThread();
avt->packetQueue()->clear(); // clear here
if (pts <= 0) {
demux_thread->demuxer->seek(qint64(-pts*1000.0) - 500LL);
QVector<qreal> ts;
qreal t = -1.0;
while (t < -pts) {
demux_thread->demuxer->readFrame();
if (demux_thread->demuxer->stream() != demux_thread->demuxer->videoStream())
continue;
t = demux_thread->demuxer->packet().pts;
ts.push_back(t);
}
const qreal t0 = ts.back();
ts.pop_back();
const qreal dt = t0 - ts.back();
pts = ts.back();
// FIXME: sometimes can not seek to the previous pts, the result pts is always current pts, so let the target pts a little earlier
pts -= dt/2.0;
}
qDebug("step backward: %lld, %f", qint64(pts*1000.0), pts);
demux_thread->video_thread->setDropFrameOnSeek(false);
demux_thread->seekInternal(qint64(pts*1000.0), AccurateSeek);
}
void AVDemuxThread::seekInternal(qint64 pos, SeekType type)
{
AVThread* av[] = { audio_thread, video_thread};
qDebug("seek to %s %lld ms (%f%%)", QTime(0, 0, 0).addMSecs(pos).toString().toUtf8().constData(), pos, double(pos - demuxer->startTime())/double(demuxer->duration())*100.0);
demuxer->setSeekType(type);
demuxer->seek(pos);
if (ademuxer) {
ademuxer->setSeekType(type);
ademuxer->seek(pos);
}
AVThread *watch_thread = 0;
// TODO: why queue may not empty?
int sync_id = 0;
for (size_t i = 0; i < sizeof(av)/sizeof(av[0]); ++i) {
AVThread *t = av[i];
if (!t)
continue;
if (!sync_id)
sync_id = t->clock()->syncStart(!!audio_thread + !!video_thread);
Q_ASSERT(sync_id != 0);
qDebug("demuxer sync id: %d/%d", sync_id, t->clock()->syncId());
t->packetQueue()->clear();
t->requestSeek();
// TODO: the first frame (key frame) will not be decoded correctly if flush() is called.
//PacketBuffer *pb = t->packetQueue();
//qDebug("%s put seek packet. %d/%d-%.3f, progress: %.3f", t->metaObject()->className(), pb->buffered(), pb->bufferValue(), pb->bufferMax(), pb->bufferProgress());
t->packetQueue()->setBlocking(false); // aqueue bufferValue can be small (1), we can not put and take
Packet pkt;
pkt.pts = qreal(pos)/1000.0;
pkt.position = sync_id;
t->packetQueue()->put(pkt);
t->packetQueue()->setBlocking(true); // blockEmpty was false when eof is read.
if (isPaused()) { //TODO: deal with pause in AVThread?
t->pause(false);
watch_thread = t;
}
}
if (watch_thread) {
pauseInternal(false);
Q_EMIT requestClockPause(false); // need direct connection
// direct connection is fine here
connect(watch_thread, SIGNAL(seekFinished(qint64)), this, SLOT(seekOnPauseFinished()), Qt::DirectConnection);
}
}
//No more data to put. So stop blocking the queue to take the reset elements
void AVDemuxThread::stop()
{
//this will not affect the pause state if we pause the output
//TODO: why remove blockFull(false) can not play another file?
AVThread* av[] = { audio_thread, video_thread};
for (size_t i = 0; i < sizeof(av)/sizeof(av[0]); ++i) {
AVThread* t = av[i];
if (!t)
continue;
t->packetQueue()->clear();
t->packetQueue()->blockFull(false); //??
while (t->isRunning()) {
qDebug() << "stopping thread " << t;
t->stop();
t->wait(500);
}
}
pause(false);
cond.wakeAll();
qDebug("all avthread finished. try to exit demux thread<<<<<<");
end = true;
}
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);
seek_tasks.clear();
bool was_end = false;
if (ademuxer) {
ademuxer->seek(0LL);
}
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
if (aqueue && (!was_end || aqueue->isEmpty())) {
aqueue->put(Packet::createEOF());
aqueue->blockEmpty(false); // do not block if buffer is not enough. block again on seek
}
if (vqueue && (!was_end || vqueue->isEmpty())) {
vqueue->put(Packet::createEOF());
vqueue->blockEmpty(false);
}
m_buffering = false;
Q_EMIT mediaStatusChanged(QtAV::BufferedMedia);
was_end = true;
// wait for a/v thread finished
msleep(100);
continue;
}
was_end = false;
if (tryPause()) {
continue; //the queue is empty and will block
}
updateBufferState();
if (!demuxer->readFrame()) {
continue;
}
stream = demuxer->stream();
pkt = demuxer->packet();
Packet apkt;
bool audio_has_pic = demuxer->hasAttacedPicture();
int a_ext = 0;
if (ademuxer) {
QMutexLocker locker(&buffer_mutex);
Q_UNUSED(locker);
if (ademuxer) {
a_ext = -1;
audio_has_pic = ademuxer->hasAttacedPicture();
// FIXME: buffer full but buffering!!!
// avoid read external track everytime. aqueue may not block full
// vqueue will not block if aqueue is not enough
if (!aqueue->isFull() || aqueue->isBuffering()) {
if (ademuxer->readFrame()) {
if (ademuxer->stream() == ademuxer->audioStream()) {
a_ext = 1;
apkt = ademuxer->packet();
}
}
// no continue otherwise. ademuxer finished earlier than demuxer
}
}
}
//qDebug("vqueue: %d, aqueue: %d/isbuffering %d isfull: %d, buffer: %d/%d", vqueue->size(), aqueue->size(), aqueue->isBuffering(), aqueue->isFull(), aqueue->buffered(), aqueue->bufferValue());
//QMutexLocker locker(&buffer_mutex); //TODO: seems we do not need to lock
//Q_UNUSED(locker);
/*1 is empty but another is enough, then do not block to
ensure the empty one can put packets immediatly.
But usually it will not happen, why?
*/
/* demux thread will be blocked only when 1 queue is full and still put
* if vqueue is full and aqueue becomes empty, then demux thread
* will be blocked. so we should wake up another queue when empty(or threshold?).
* TODO: the video stream and audio stream may be group by group. provide it
* stream data: aaaaaaavvvvvvvaaaaaaaavvvvvvvvvaaaaaa, it happens
* stream data: aavavvavvavavavavavavavavvvaavavavava, it's ok
*/
//TODO: use cache queue, take from cache queue if not empty?
const bool a_internal = stream == demuxer->audioStream();
if (a_internal || a_ext > 0) {//apkt.isValid()) {
if (a_internal && !a_ext) // internal is always read even if external audio used
apkt = demuxer->packet();
/* if vqueue if not blocked and full, and aqueue is empty, then put to
* vqueue will block demuex thread
*/
if (aqueue) {
if (!audio_thread || !audio_thread->isRunning()) {
aqueue->clear();
continue;
}
// must ensure bufferValue set correctly before continue
if (m_buffer != aqueue)
aqueue->setBufferValue(m_buffer->isBuffering() ? std::numeric_limits<qint64>::max() : buf2);
// always block full if no vqueue because empty callback may set false
// attached picture is cover for song, 1 frame
aqueue->blockFull(!video_thread || !video_thread->isRunning() || !vqueue || audio_has_pic);
// external audio: a_ext < 0, stream = audio_idx=>put invalid packet
if (a_ext >= 0)
aqueue->put(apkt); //affect video_thread
}
}
// always check video stream if use external audio
if (stream == demuxer->videoStream()) {
if (vqueue) {
if (!video_thread || !video_thread->isRunning()) {
vqueue->clear();
continue;
}
vqueue->blockFull(!audio_thread || !audio_thread->isRunning() || !aqueue || aqueue->isEnough());
vqueue->put(pkt); //affect audio_thread
}
} else if (demuxer->subtitleStreams().contains(stream)) { //subtitle
Q_EMIT internalSubtitlePacketRead(demuxer->subtitleStreams().indexOf(stream), pkt);
} else {
continue;
}
}
m_buffering = false;
m_buffer = 0;
while (audio_thread && audio_thread->isRunning()) {
qDebug("waiting audio thread.......");
aqueue->blockEmpty(false); //FIXME: why need this
audio_thread->wait(500);
}
while (video_thread && video_thread->isRunning()) {
qDebug("waiting video thread.......");
vqueue->blockEmpty(false);
video_thread->wait(500);
}
thread->disconnect(this, SIGNAL(seekFinished(qint64)));
qDebug("Demux thread stops running....");
emit mediaStatusChanged(QtAV::EndOfMedia);
}