Mac-4.7.4/src/3rdparty/phonon/qt7/quicktimeaudioplayer.mm - platform/external/qt - Git at Google

 /*  This file is part of the KDE project.

     Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     This library is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation, either version 2.1 or 3 of the License.

     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public License
     along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

 #import <QTKit/QTMovie.h>

 #include "quicktimeaudioplayer.h"
 #include "quicktimevideoplayer.h"
 #include "audiograph.h"
 #include "medianodeevent.h"
 #include "medianode.h"

 QT_BEGIN_NAMESPACE

 namespace Phonon
 {
 namespace QT7
 {

 QuickTimeAudioPlayer::QuickTimeAudioPlayer() : AudioNode(0, 1)
 {
     m_state = NoMedia;
     m_videoPlayer = 0;
     m_audioChannelLayout = 0;
     m_sliceList = 0;
     m_sliceCount = 30;
     m_maxExtractionPacketCount = 4096;
     m_audioExtractionComplete = false;
     m_audioEnabled = true;
     m_samplesRemaining = -1;
     m_startTime = 0;
     m_sampleTimeStamp = 0;
     m_audioUnitIsReset = true;

 #ifdef QUICKTIME_C_API_AVAILABLE
     m_audioExtractionRef = 0;
 #endif
 }

 QuickTimeAudioPlayer::~QuickTimeAudioPlayer()
 {
     unsetVideoPlayer();
 }

 void QuickTimeAudioPlayer::unsetVideoPlayer()
 {
     if (m_audioUnit){
         OSStatus err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
         BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit when unsetting movie", FATAL_ERROR)
     }

 #ifdef QUICKTIME_C_API_AVAILABLE
     if (m_audioExtractionRef && m_videoPlayer && m_videoPlayer->hasMovie())
          MovieAudioExtractionEnd(m_audioExtractionRef);
     m_audioExtractionRef = 0;
 #endif

     if (m_audioChannelLayout){
         free(m_audioChannelLayout);
         m_audioChannelLayout = 0;
     }

     if (m_sliceList){
         for (int i=0; i<m_sliceCount; i++)
 	        free(m_sliceList[i].mBufferList);
         free(m_sliceList);
         m_sliceList = 0;
     }

     m_videoPlayer = 0;
     m_audioExtractionComplete = false;
     m_samplesRemaining = -1;
     m_sampleTimeStamp = 0;
     m_state = NoMedia;
 }

 void QuickTimeAudioPlayer::enableAudio(bool enable)
 {
     // Remember to seek after enabling audio.
     if (enable == m_audioEnabled)
         return;

     m_audioEnabled = enable;
     if (!enable)
         flush();
 }

 bool QuickTimeAudioPlayer::audioEnabled()
 {
     return m_audioEnabled;
 }

 void QuickTimeAudioPlayer::setVideoPlayer(QuickTimeVideoPlayer *videoPlayer)
 {
     unsetVideoPlayer();
     if (videoPlayer && videoPlayer->hasMovie()){
         m_videoPlayer = videoPlayer;
         initSoundExtraction();
         allocateSoundSlices();
         m_state = Paused;
         seek(0);
     }
 }

 QuickTimeVideoPlayer *QuickTimeAudioPlayer::videoPlayer()
 {
     return m_videoPlayer;
 }

 void QuickTimeAudioPlayer::scheduleAudioToGraph()
 {
     if (!m_videoPlayer || !m_audioEnabled || m_audioExtractionComplete || m_state != Playing)
         return;

     // Schedule audio slices, and detect if everything went OK.
     // If not, flag the need for another audio system, but let
     // the end app know about it:
     gClearError();
     scheduleSoundSlices();
     if (gGetErrorType() != NO_ERROR){
         gClearError();
         if (m_audioGraph)
             m_audioGraph->setStatusCannotPlay();
     }
 }

 void QuickTimeAudioPlayer::flush()
 {
     // Empty scheduled audio data, so playback
     // will stop. Call seek to refill data again.
     if (m_audioUnit){
         m_startTime = currentTime();
         OSStatus err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
         BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit on pause", FATAL_ERROR)
         m_audioUnitIsReset = true;
     }
 }

 void QuickTimeAudioPlayer::pause()
 {
     m_state = Paused;
     flush();
 }

 void QuickTimeAudioPlayer::play()
 {
     m_state = Playing;
     if (!m_audioEnabled)
         return;
     if (m_audioUnitIsReset)
         seek(m_startTime);
     else
         scheduleAudioToGraph();
 }

 bool QuickTimeAudioPlayer::isPlaying()
 {
     return m_videoPlayer && m_state == Playing;
 }

 void QuickTimeAudioPlayer::seek(quint64 milliseconds)
 {
     if (!m_videoPlayer || !m_videoPlayer->hasMovie())
         return;
     if (milliseconds > m_videoPlayer->duration())
         milliseconds = m_videoPlayer->duration();
     if (!m_audioUnitIsReset && milliseconds == currentTime())
         return;

     m_startTime = milliseconds;

     // Since the graph may be running (advancing time), there is
     // no point in seeking if were not going to play immidiatly:
     if (m_state != Playing)
         return;
     if (!m_audioUnit)
         return;
     if (!m_audioEnabled || !m_videoPlayer->isSeekable())
         return;

     // Reset (and stop playing):
     OSStatus err;
     if (!m_audioUnitIsReset){
         err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
         BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit before seek", FATAL_ERROR)
     }
     m_sampleTimeStamp = 0;
     for (int i = 0; i < m_sliceCount; i++)
 	    m_sliceList[i].mFlags = kScheduledAudioSliceFlag_Complete;

     // Start to play again immidiatly:
     AudioTimeStamp timeStamp;
     memset(&timeStamp, 0, sizeof(timeStamp));
 	timeStamp.mFlags = kAudioTimeStampSampleTimeValid;
     timeStamp.mSampleTime = -1;
 	err = AudioUnitSetProperty(m_audioUnit,
         kAudioUnitProperty_ScheduleStartTimeStamp, kAudioUnitScope_Global,
         0, &timeStamp, sizeof(timeStamp));
     BACKEND_ASSERT2(err == noErr, "Could not set schedule start time stamp on audio player unit", FATAL_ERROR)

     // Seek back to 'now' in the movie:
     TimeRecord timeRec;
 	timeRec.scale = m_videoPlayer->timeScale();
     timeRec.base = 0;
 	timeRec.value.hi = 0;
 	timeRec.value.lo = (milliseconds / 1000.0f) * timeRec.scale;

 #ifdef QUICKTIME_C_API_AVAILABLE
 	err = MovieAudioExtractionSetProperty(m_audioExtractionRef,
         kQTPropertyClass_MovieAudioExtraction_Movie,
         kQTMovieAudioExtractionMoviePropertyID_CurrentTime,
         sizeof(TimeRecord), &timeRec);
     BACKEND_ASSERT2(err == noErr, "Could not set current time on audio player unit", FATAL_ERROR)
 #endif

     float durationLeftSec = float(m_videoPlayer->duration() - milliseconds) / 1000.0f;
     m_samplesRemaining = (durationLeftSec > 0) ? (durationLeftSec * m_audioStreamDescription.mSampleRate) : -1;
     m_audioExtractionComplete = false;
     m_audioUnitIsReset = false;
     scheduleAudioToGraph();

 }

 quint64 QuickTimeAudioPlayer::currentTime()
 {
     if (!m_audioUnit){
         if (m_videoPlayer)
             return m_videoPlayer->currentTime();
         else
             return m_startTime;
     }

     Float64 currentUnitTime = getTimeInSamples(kAudioUnitProperty_CurrentPlayTime);
     if (currentUnitTime == -1)
         currentUnitTime = 0;

     quint64 cTime = quint64(m_startTime +
         float(currentUnitTime / float(m_audioStreamDescription.mSampleRate)) * 1000.0f);
     return (m_videoPlayer && cTime > m_videoPlayer->duration()) ? m_videoPlayer->duration() : cTime;
 }

 QString QuickTimeAudioPlayer::currentTimeString()
 {
     return QuickTimeVideoPlayer::timeToString(currentTime());
 }

 bool QuickTimeAudioPlayer::hasAudio()
 {
     if (!m_videoPlayer)
         return false;

     return m_videoPlayer->hasAudio();
 }

 bool QuickTimeAudioPlayer::soundPlayerIsAwailable()
 {
     QuickTimeAudioPlayer player;
     ComponentDescription d = player.getAudioNodeDescription();
     return FindNextComponent(0, &d);
 }

 ComponentDescription QuickTimeAudioPlayer::getAudioNodeDescription() const
 {
 	ComponentDescription description;
 	description.componentType = kAudioUnitType_Generator;
 	description.componentSubType = kAudioUnitSubType_ScheduledSoundPlayer;
 	description.componentManufacturer = kAudioUnitManufacturer_Apple;
 	description.componentFlags = 0;
 	description.componentFlagsMask = 0;
     return description;
 }

 void QuickTimeAudioPlayer::initializeAudioUnit()
 {
 }

 bool QuickTimeAudioPlayer::fillInStreamSpecification(AudioConnection *connection, ConnectionSide side)
 {
     if (!m_videoPlayer){
         if (side == Source)
             DEBUG_AUDIO_STREAM("QuickTimeAudioPlayer" << int(this) << "is source, but has no movie to use for stream spec fill.")
         return true;
     }

     if (side == Source){
         DEBUG_AUDIO_STREAM("QuickTimeAudioPlayer" << int(this) << "is source, and fills in stream spec from movie.")
         connection->m_sourceStreamDescription = m_audioStreamDescription;
         connection->m_sourceChannelLayout = (AudioChannelLayout *) malloc(m_audioChannelLayoutSize);
         memcpy(connection->m_sourceChannelLayout, m_audioChannelLayout, m_audioChannelLayoutSize);
         connection->m_sourceChannelLayoutSize = m_audioChannelLayoutSize;
         connection->m_hasSourceSpecification = true;
     }
     return true;
 }

 long QuickTimeAudioPlayer::regularTaskFrequency(){
     if (!m_audioEnabled || !m_audioUnit || (m_audioGraph && m_audioGraph->graphCannotPlay()))
         return INT_MAX;

     // Calculate how much audio in
     // milliseconds our slices can hold:
     int packetNeedPerSecond = m_audioStreamDescription.mSampleRate / m_maxExtractionPacketCount;
     long bufferTimeLengthSec = float(m_sliceCount) / float(packetNeedPerSecond);
     // Make sure we also get some time to fill the
     // buffer, so divide the time by two:
     return (bufferTimeLengthSec * (1000 / 2));
 }

 void QuickTimeAudioPlayer::initSoundExtraction()
 {
 #ifdef QUICKTIME_C_API_AVAILABLE

     // Initilize the extraction:
 	OSStatus err = noErr;
 	err = MovieAudioExtractionBegin([m_videoPlayer->qtMovie() quickTimeMovie], 0, &m_audioExtractionRef);
     BACKEND_ASSERT2(err == noErr, "Could not start audio extraction on audio player unit", FATAL_ERROR)
 	m_discrete = false;
 #if 0
     // Extract all channels as descrete:
     err = MovieAudioExtractionSetProperty(audioExtractionRef,
         kQTPropertyClass_MovieAudioExtraction_Movie,
         kQTMovieAudioExtractionMoviePropertyID_AllChannelsDiscrete,
         sizeof (discrete),
         &discrete);
     BACKEND_ASSERT2(err == noErr, "Could not set channels discrete on audio player unit", FATAL_ERROR)
 #endif

 	// Get the size of the audio channel layout (may include offset):
 	err = MovieAudioExtractionGetPropertyInfo(m_audioExtractionRef,
 	    kQTPropertyClass_MovieAudioExtraction_Audio,
         kQTMovieAudioExtractionAudioPropertyID_AudioChannelLayout,
         0, &m_audioChannelLayoutSize, 0);
     BACKEND_ASSERT2(err == noErr, "Could not get channel layout size from audio extraction", FATAL_ERROR)

 	// Allocate memory for the layout
 	m_audioChannelLayout = (AudioChannelLayout *) calloc(1, m_audioChannelLayoutSize);
     BACKEND_ASSERT2(m_audioChannelLayout, "Could not allocate memory for channel layout on audio player unit", FATAL_ERROR)

 	// Get the layout:
 	err = MovieAudioExtractionGetProperty(m_audioExtractionRef,
 	    kQTPropertyClass_MovieAudioExtraction_Audio,
 		kQTMovieAudioExtractionAudioPropertyID_AudioChannelLayout,
 		m_audioChannelLayoutSize, m_audioChannelLayout, 0);
     BACKEND_ASSERT2(err == noErr, "Could not get channel layout from audio extraction", FATAL_ERROR)

 	// Get audio stream description:
 	err = MovieAudioExtractionGetProperty(m_audioExtractionRef,
         kQTPropertyClass_MovieAudioExtraction_Audio,
         kQTMovieAudioExtractionAudioPropertyID_AudioStreamBasicDescription,
         sizeof(m_audioStreamDescription), &m_audioStreamDescription, 0);
     BACKEND_ASSERT2(err == noErr, "Could not get audio stream description from audio extraction", FATAL_ERROR)

 #endif // QUICKTIME_C_API_AVAILABLE
 }

 void QuickTimeAudioPlayer::allocateSoundSlices()
 {
 #ifdef QUICKTIME_C_API_AVAILABLE

     // m_sliceList will contain a specified number of ScheduledAudioSlice-s that each can
     // carry audio from extraction, and be scheduled for playback at an audio unit.
     // Each ScheduledAudioSlice will contain several audio buffers, one for each sound channel.
     // Each buffer will carry (at most) a specified number of sound packets, and each packet can
     // contain one or more frames.

     // Create a list of ScheduledAudioSlices:
 	m_sliceList = (ScheduledAudioSlice *) calloc(m_sliceCount, sizeof(ScheduledAudioSlice));
     BACKEND_ASSERT2(m_sliceList, "Could not allocate memory for audio slices", FATAL_ERROR)
 	bzero(m_sliceList, m_sliceCount * sizeof(ScheduledAudioSlice));

     // Calculate the size of the different structures needed:
 	int packetsBufferSize = m_maxExtractionPacketCount * m_audioStreamDescription.mBytesPerPacket;
     int channels = m_audioStreamDescription.mChannelsPerFrame;
 	int audioBufferListSize = int(sizeof(AudioBufferList) + (channels-1) * sizeof(AudioBuffer));
 	int mallocSize = audioBufferListSize + (packetsBufferSize * m_audioStreamDescription.mChannelsPerFrame);

     // Round off to Altivec sizes:
     packetsBufferSize = int(((packetsBufferSize + 15) / 16) * 16);
     audioBufferListSize = int(((audioBufferListSize + 15) / 16) * 16);

  	for (int sliceIndex = 0; sliceIndex < m_sliceCount; ++sliceIndex){
         // Create the memory chunk for this audio slice:
 		AudioBufferList	*audioBufferList = (AudioBufferList*) calloc(1, mallocSize);
         BACKEND_ASSERT2(audioBufferList, "Could not allocate memory for audio buffer list", FATAL_ERROR)

         // The AudioBufferList contains an AudioBuffer for each channel in the audio stream:
 		audioBufferList->mNumberBuffers = m_audioStreamDescription.mChannelsPerFrame;
 		for (uint i = 0; i < audioBufferList->mNumberBuffers; ++i){
 			audioBufferList->mBuffers[i].mNumberChannels = 1;
 			audioBufferList->mBuffers[i].mData = (char *) audioBufferList + audioBufferListSize + (i * packetsBufferSize);
 			audioBufferList->mBuffers[i].mDataByteSize = packetsBufferSize;
 		}

 		m_sliceList[sliceIndex].mBufferList = audioBufferList;
 		m_sliceList[sliceIndex].mNumberFrames = m_maxExtractionPacketCount;
 		m_sliceList[sliceIndex].mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;
 		m_sliceList[sliceIndex].mCompletionProcUserData = 0;
 		m_sliceList[sliceIndex].mCompletionProc = 0;
 		m_sliceList[sliceIndex].mFlags = kScheduledAudioSliceFlag_Complete;
 		m_sliceList[sliceIndex].mReserved = 0;
 	}

 #endif // QUICKTIME_C_API_AVAILABLE
 }

 void QuickTimeAudioPlayer::scheduleSoundSlices()
 {
 #ifdef QUICKTIME_C_API_AVAILABLE

     PhononAutoReleasePool pool;
 	// For each completed (or never used) slice, fill and schedule it.
 	for (int sliceIndex = 0; sliceIndex < m_sliceCount; ++sliceIndex){
 		if (m_sliceList[sliceIndex].mFlags & kScheduledAudioSliceFlag_Complete){
 			if (m_samplesRemaining == 0)
 				m_audioExtractionComplete = true;

 			if (!m_audioExtractionComplete){
 			    // Determine how many samples to read:
 				int samplesCount = m_samplesRemaining;
 				if ((samplesCount > m_maxExtractionPacketCount) || (samplesCount == -1))
 					samplesCount = m_maxExtractionPacketCount;
 				m_sliceList[sliceIndex].mTimeStamp.mSampleTime = m_sampleTimeStamp;

 	            // Reset buffer sizes:
 	            int byteSize = samplesCount * m_audioStreamDescription.mBytesPerPacket;
 	            for (uint i = 0; i < m_sliceList[sliceIndex].mBufferList->mNumberBuffers; ++i)
                     m_sliceList[sliceIndex].mBufferList->mBuffers[i].mDataByteSize = byteSize;

 	            // Do the extraction:
                 UInt32 flags = 0;
                 UInt32 samplesRead = samplesCount;
 	            OSStatus err = MovieAudioExtractionFillBuffer(
 	                m_audioExtractionRef, &samplesRead, m_sliceList[sliceIndex].mBufferList, &flags);
                 BACKEND_ASSERT2(err == noErr, "Could not fill audio buffers from audio extraction", FATAL_ERROR)
 	            m_audioExtractionComplete = (flags & kQTMovieAudioExtractionComplete);

 	            // Play the slice:
 	            if (samplesRead != 0 && m_audioUnit != 0){
                     m_sliceList[sliceIndex].mNumberFrames = samplesRead;
                     err = AudioUnitSetProperty(m_audioUnit,
                         kAudioUnitProperty_ScheduleAudioSlice, kAudioUnitScope_Global,
                         0, &m_sliceList[sliceIndex], sizeof(ScheduledAudioSlice));
                     BACKEND_ASSERT2(err == noErr, "Could not schedule audio buffers on audio unit", FATAL_ERROR)
  	            } else
 					m_sliceList[sliceIndex].mFlags = kScheduledAudioSliceFlag_Complete;

                 // Move the window:
 				m_sampleTimeStamp += samplesRead;
 				if (m_samplesRemaining != -1)
 					m_samplesRemaining -= samplesRead;
 			}
 		}
 	}

 #endif // QUICKTIME_C_API_AVAILABLE
 }

 void QuickTimeAudioPlayer::mediaNodeEvent(const MediaNodeEvent *event)
 {
     switch (event->type()){
         case MediaNodeEvent::AudioGraphAboutToBeDeleted:
         case MediaNodeEvent::AboutToRestartAudioStream:
         case MediaNodeEvent::StartConnectionChange:
             m_startTime = currentTime();
             break;
         case MediaNodeEvent::AudioGraphInitialized:
         case MediaNodeEvent::RestartAudioStreamRequest:
         case MediaNodeEvent::EndConnectionChange:
             if (m_state == Playing)
                 seek(m_startTime);
             break;
        default:
             break;
     }
 }

 }}

 QT_END_NAMESPACE
	/* This file is part of the KDE project.

	Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

	This library is free software: you can redistribute it and/or modify
	it under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation, either version 2.1 or 3 of the License.

	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with this library. If not, see <http://www.gnu.org/licenses/>.
	*/

	#import <QTKit/QTMovie.h>

	#include "quicktimeaudioplayer.h"
	#include "quicktimevideoplayer.h"
	#include "audiograph.h"
	#include "medianodeevent.h"
	#include "medianode.h"

	QT_BEGIN_NAMESPACE

	namespace Phonon
	{
	namespace QT7
	{

	QuickTimeAudioPlayer::QuickTimeAudioPlayer() : AudioNode(0, 1)
	{
	m_state = NoMedia;
	m_videoPlayer = 0;
	m_audioChannelLayout = 0;
	m_sliceList = 0;
	m_sliceCount = 30;
	m_maxExtractionPacketCount = 4096;
	m_audioExtractionComplete = false;
	m_audioEnabled = true;
	m_samplesRemaining = -1;
	m_startTime = 0;
	m_sampleTimeStamp = 0;
	m_audioUnitIsReset = true;

	#ifdef QUICKTIME_C_API_AVAILABLE
	m_audioExtractionRef = 0;
	#endif
	}

	QuickTimeAudioPlayer::~QuickTimeAudioPlayer()
	{
	unsetVideoPlayer();
	}

	void QuickTimeAudioPlayer::unsetVideoPlayer()
	{
	if (m_audioUnit){
	OSStatus err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
	BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit when unsetting movie", FATAL_ERROR)
	}

	#ifdef QUICKTIME_C_API_AVAILABLE
	if (m_audioExtractionRef && m_videoPlayer && m_videoPlayer->hasMovie())
	MovieAudioExtractionEnd(m_audioExtractionRef);
	m_audioExtractionRef = 0;
	#endif

	if (m_audioChannelLayout){
	free(m_audioChannelLayout);
	m_audioChannelLayout = 0;
	}

	if (m_sliceList){
	for (int i=0; i<m_sliceCount; i++)
	free(m_sliceList[i].mBufferList);
	free(m_sliceList);
	m_sliceList = 0;
	}

	m_videoPlayer = 0;
	m_audioExtractionComplete = false;
	m_samplesRemaining = -1;
	m_sampleTimeStamp = 0;
	m_state = NoMedia;
	}

	void QuickTimeAudioPlayer::enableAudio(bool enable)
	{
	// Remember to seek after enabling audio.
	if (enable == m_audioEnabled)
	return;

	m_audioEnabled = enable;
	if (!enable)
	flush();
	}

	bool QuickTimeAudioPlayer::audioEnabled()
	{
	return m_audioEnabled;
	}

	void QuickTimeAudioPlayer::setVideoPlayer(QuickTimeVideoPlayer *videoPlayer)
	{
	unsetVideoPlayer();
	if (videoPlayer && videoPlayer->hasMovie()){
	m_videoPlayer = videoPlayer;
	initSoundExtraction();
	allocateSoundSlices();
	m_state = Paused;
	seek(0);
	}
	}

	QuickTimeVideoPlayer *QuickTimeAudioPlayer::videoPlayer()
	{
	return m_videoPlayer;
	}

	void QuickTimeAudioPlayer::scheduleAudioToGraph()
	{
	if (!m_videoPlayer \|\| !m_audioEnabled \|\| m_audioExtractionComplete \|\| m_state != Playing)
	return;

	// Schedule audio slices, and detect if everything went OK.
	// If not, flag the need for another audio system, but let
	// the end app know about it:
	gClearError();
	scheduleSoundSlices();
	if (gGetErrorType() != NO_ERROR){
	gClearError();
	if (m_audioGraph)
	m_audioGraph->setStatusCannotPlay();
	}
	}

	void QuickTimeAudioPlayer::flush()
	{
	// Empty scheduled audio data, so playback
	// will stop. Call seek to refill data again.
	if (m_audioUnit){
	m_startTime = currentTime();
	OSStatus err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
	BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit on pause", FATAL_ERROR)
	m_audioUnitIsReset = true;
	}
	}

	void QuickTimeAudioPlayer::pause()
	{
	m_state = Paused;
	flush();
	}

	void QuickTimeAudioPlayer::play()
	{
	m_state = Playing;
	if (!m_audioEnabled)
	return;
	if (m_audioUnitIsReset)
	seek(m_startTime);
	else
	scheduleAudioToGraph();
	}

	bool QuickTimeAudioPlayer::isPlaying()
	{
	return m_videoPlayer && m_state == Playing;
	}

	void QuickTimeAudioPlayer::seek(quint64 milliseconds)
	{
	if (!m_videoPlayer \|\| !m_videoPlayer->hasMovie())
	return;
	if (milliseconds > m_videoPlayer->duration())
	milliseconds = m_videoPlayer->duration();
	if (!m_audioUnitIsReset && milliseconds == currentTime())
	return;

	m_startTime = milliseconds;

	// Since the graph may be running (advancing time), there is
	// no point in seeking if were not going to play immidiatly:
	if (m_state != Playing)
	return;
	if (!m_audioUnit)
	return;
	if (!m_audioEnabled \|\| !m_videoPlayer->isSeekable())
	return;

	// Reset (and stop playing):
	OSStatus err;
	if (!m_audioUnitIsReset){
	err = AudioUnitReset(m_audioUnit, kAudioUnitScope_Global, 0);
	BACKEND_ASSERT2(err == noErr, "Could not reset audio player unit before seek", FATAL_ERROR)
	}
	m_sampleTimeStamp = 0;
	for (int i = 0; i < m_sliceCount; i++)
	m_sliceList[i].mFlags = kScheduledAudioSliceFlag_Complete;

	// Start to play again immidiatly:
	AudioTimeStamp timeStamp;
	memset(&timeStamp, 0, sizeof(timeStamp));
	timeStamp.mFlags = kAudioTimeStampSampleTimeValid;
	timeStamp.mSampleTime = -1;
	err = AudioUnitSetProperty(m_audioUnit,
	kAudioUnitProperty_ScheduleStartTimeStamp, kAudioUnitScope_Global,
	0, &timeStamp, sizeof(timeStamp));
	BACKEND_ASSERT2(err == noErr, "Could not set schedule start time stamp on audio player unit", FATAL_ERROR)

	// Seek back to 'now' in the movie:
	TimeRecord timeRec;
	timeRec.scale = m_videoPlayer->timeScale();
	timeRec.base = 0;
	timeRec.value.hi = 0;
	timeRec.value.lo = (milliseconds / 1000.0f) * timeRec.scale;

	#ifdef QUICKTIME_C_API_AVAILABLE
	err = MovieAudioExtractionSetProperty(m_audioExtractionRef,
	kQTPropertyClass_MovieAudioExtraction_Movie,
	kQTMovieAudioExtractionMoviePropertyID_CurrentTime,
	sizeof(TimeRecord), &timeRec);
	BACKEND_ASSERT2(err == noErr, "Could not set current time on audio player unit", FATAL_ERROR)
	#endif

	float durationLeftSec = float(m_videoPlayer->duration() - milliseconds) / 1000.0f;
	m_samplesRemaining = (durationLeftSec > 0) ? (durationLeftSec * m_audioStreamDescription.mSampleRate) : -1;
	m_audioExtractionComplete = false;
	m_audioUnitIsReset = false;
	scheduleAudioToGraph();

	}

	quint64 QuickTimeAudioPlayer::currentTime()
	{
	if (!m_audioUnit){
	if (m_videoPlayer)
	return m_videoPlayer->currentTime();
	else
	return m_startTime;
	}

	Float64 currentUnitTime = getTimeInSamples(kAudioUnitProperty_CurrentPlayTime);
	if (currentUnitTime == -1)
	currentUnitTime = 0;

	quint64 cTime = quint64(m_startTime +
	float(currentUnitTime / float(m_audioStreamDescription.mSampleRate)) * 1000.0f);
	return (m_videoPlayer && cTime > m_videoPlayer->duration()) ? m_videoPlayer->duration() : cTime;
	}

	QString QuickTimeAudioPlayer::currentTimeString()
	{
	return QuickTimeVideoPlayer::timeToString(currentTime());
	}

	bool QuickTimeAudioPlayer::hasAudio()
	{
	if (!m_videoPlayer)
	return false;

	return m_videoPlayer->hasAudio();
	}

	bool QuickTimeAudioPlayer::soundPlayerIsAwailable()
	{
	QuickTimeAudioPlayer player;
	ComponentDescription d = player.getAudioNodeDescription();
	return FindNextComponent(0, &d);
	}

	ComponentDescription QuickTimeAudioPlayer::getAudioNodeDescription() const
	{
	ComponentDescription description;
	description.componentType = kAudioUnitType_Generator;
	description.componentSubType = kAudioUnitSubType_ScheduledSoundPlayer;
	description.componentManufacturer = kAudioUnitManufacturer_Apple;
	description.componentFlags = 0;
	description.componentFlagsMask = 0;
	return description;
	}

	void QuickTimeAudioPlayer::initializeAudioUnit()
	{
	}

	bool QuickTimeAudioPlayer::fillInStreamSpecification(AudioConnection *connection, ConnectionSide side)
	{
	if (!m_videoPlayer){
	if (side == Source)
	DEBUG_AUDIO_STREAM("QuickTimeAudioPlayer" << int(this) << "is source, but has no movie to use for stream spec fill.")
	return true;
	}

	if (side == Source){
	DEBUG_AUDIO_STREAM("QuickTimeAudioPlayer" << int(this) << "is source, and fills in stream spec from movie.")
	connection->m_sourceStreamDescription = m_audioStreamDescription;
	connection->m_sourceChannelLayout = (AudioChannelLayout *) malloc(m_audioChannelLayoutSize);
	memcpy(connection->m_sourceChannelLayout, m_audioChannelLayout, m_audioChannelLayoutSize);
	connection->m_sourceChannelLayoutSize = m_audioChannelLayoutSize;
	connection->m_hasSourceSpecification = true;
	}
	return true;
	}

	long QuickTimeAudioPlayer::regularTaskFrequency(){
	if (!m_audioEnabled \|\| !m_audioUnit \|\| (m_audioGraph && m_audioGraph->graphCannotPlay()))
	return INT_MAX;

	// Calculate how much audio in
	// milliseconds our slices can hold:
	int packetNeedPerSecond = m_audioStreamDescription.mSampleRate / m_maxExtractionPacketCount;
	long bufferTimeLengthSec = float(m_sliceCount) / float(packetNeedPerSecond);
	// Make sure we also get some time to fill the
	// buffer, so divide the time by two:
	return (bufferTimeLengthSec * (1000 / 2));
	}

	void QuickTimeAudioPlayer::initSoundExtraction()
	{
	#ifdef QUICKTIME_C_API_AVAILABLE

	// Initilize the extraction:
	OSStatus err = noErr;
	err = MovieAudioExtractionBegin([m_videoPlayer->qtMovie() quickTimeMovie], 0, &m_audioExtractionRef);
	BACKEND_ASSERT2(err == noErr, "Could not start audio extraction on audio player unit", FATAL_ERROR)
	m_discrete = false;
	#if 0
	// Extract all channels as descrete:
	err = MovieAudioExtractionSetProperty(audioExtractionRef,
	kQTPropertyClass_MovieAudioExtraction_Movie,
	kQTMovieAudioExtractionMoviePropertyID_AllChannelsDiscrete,
	sizeof (discrete),
	&discrete);
	BACKEND_ASSERT2(err == noErr, "Could not set channels discrete on audio player unit", FATAL_ERROR)
	#endif

	// Get the size of the audio channel layout (may include offset):
	err = MovieAudioExtractionGetPropertyInfo(m_audioExtractionRef,
	kQTPropertyClass_MovieAudioExtraction_Audio,
	kQTMovieAudioExtractionAudioPropertyID_AudioChannelLayout,
	0, &m_audioChannelLayoutSize, 0);
	BACKEND_ASSERT2(err == noErr, "Could not get channel layout size from audio extraction", FATAL_ERROR)

	// Allocate memory for the layout
	m_audioChannelLayout = (AudioChannelLayout *) calloc(1, m_audioChannelLayoutSize);
	BACKEND_ASSERT2(m_audioChannelLayout, "Could not allocate memory for channel layout on audio player unit", FATAL_ERROR)

	// Get the layout:
	err = MovieAudioExtractionGetProperty(m_audioExtractionRef,
	kQTPropertyClass_MovieAudioExtraction_Audio,
	kQTMovieAudioExtractionAudioPropertyID_AudioChannelLayout,
	m_audioChannelLayoutSize, m_audioChannelLayout, 0);
	BACKEND_ASSERT2(err == noErr, "Could not get channel layout from audio extraction", FATAL_ERROR)

	// Get audio stream description:
	err = MovieAudioExtractionGetProperty(m_audioExtractionRef,
	kQTPropertyClass_MovieAudioExtraction_Audio,
	kQTMovieAudioExtractionAudioPropertyID_AudioStreamBasicDescription,
	sizeof(m_audioStreamDescription), &m_audioStreamDescription, 0);
	BACKEND_ASSERT2(err == noErr, "Could not get audio stream description from audio extraction", FATAL_ERROR)

	#endif // QUICKTIME_C_API_AVAILABLE
	}

	void QuickTimeAudioPlayer::allocateSoundSlices()
	{
	#ifdef QUICKTIME_C_API_AVAILABLE

	// m_sliceList will contain a specified number of ScheduledAudioSlice-s that each can
	// carry audio from extraction, and be scheduled for playback at an audio unit.
	// Each ScheduledAudioSlice will contain several audio buffers, one for each sound channel.
	// Each buffer will carry (at most) a specified number of sound packets, and each packet can
	// contain one or more frames.

	// Create a list of ScheduledAudioSlices:
	m_sliceList = (ScheduledAudioSlice *) calloc(m_sliceCount, sizeof(ScheduledAudioSlice));
	BACKEND_ASSERT2(m_sliceList, "Could not allocate memory for audio slices", FATAL_ERROR)
	bzero(m_sliceList, m_sliceCount * sizeof(ScheduledAudioSlice));

	// Calculate the size of the different structures needed:
	int packetsBufferSize = m_maxExtractionPacketCount * m_audioStreamDescription.mBytesPerPacket;
	int channels = m_audioStreamDescription.mChannelsPerFrame;
	int audioBufferListSize = int(sizeof(AudioBufferList) + (channels-1) * sizeof(AudioBuffer));
	int mallocSize = audioBufferListSize + (packetsBufferSize * m_audioStreamDescription.mChannelsPerFrame);

	// Round off to Altivec sizes:
	packetsBufferSize = int(((packetsBufferSize + 15) / 16) * 16);
	audioBufferListSize = int(((audioBufferListSize + 15) / 16) * 16);

	for (int sliceIndex = 0; sliceIndex < m_sliceCount; ++sliceIndex){
	// Create the memory chunk for this audio slice:
	AudioBufferList audioBufferList = (AudioBufferList) calloc(1, mallocSize);
	BACKEND_ASSERT2(audioBufferList, "Could not allocate memory for audio buffer list", FATAL_ERROR)

	// The AudioBufferList contains an AudioBuffer for each channel in the audio stream:
	audioBufferList->mNumberBuffers = m_audioStreamDescription.mChannelsPerFrame;
	for (uint i = 0; i < audioBufferList->mNumberBuffers; ++i){
	audioBufferList->mBuffers[i].mNumberChannels = 1;
	audioBufferList->mBuffers[i].mData = (char ) audioBufferList + audioBufferListSize + (i packetsBufferSize);
	audioBufferList->mBuffers[i].mDataByteSize = packetsBufferSize;
	}

	m_sliceList[sliceIndex].mBufferList = audioBufferList;
	m_sliceList[sliceIndex].mNumberFrames = m_maxExtractionPacketCount;
	m_sliceList[sliceIndex].mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;
	m_sliceList[sliceIndex].mCompletionProcUserData = 0;
	m_sliceList[sliceIndex].mCompletionProc = 0;
	m_sliceList[sliceIndex].mFlags = kScheduledAudioSliceFlag_Complete;
	m_sliceList[sliceIndex].mReserved = 0;
	}

	#endif // QUICKTIME_C_API_AVAILABLE
	}

	void QuickTimeAudioPlayer::scheduleSoundSlices()
	{
	#ifdef QUICKTIME_C_API_AVAILABLE

	PhononAutoReleasePool pool;
	// For each completed (or never used) slice, fill and schedule it.
	for (int sliceIndex = 0; sliceIndex < m_sliceCount; ++sliceIndex){
	if (m_sliceList[sliceIndex].mFlags & kScheduledAudioSliceFlag_Complete){
	if (m_samplesRemaining == 0)
	m_audioExtractionComplete = true;

	if (!m_audioExtractionComplete){
	// Determine how many samples to read:
	int samplesCount = m_samplesRemaining;
	if ((samplesCount > m_maxExtractionPacketCount) \|\| (samplesCount == -1))
	samplesCount = m_maxExtractionPacketCount;
	m_sliceList[sliceIndex].mTimeStamp.mSampleTime = m_sampleTimeStamp;

	// Reset buffer sizes:
	int byteSize = samplesCount * m_audioStreamDescription.mBytesPerPacket;
	for (uint i = 0; i < m_sliceList[sliceIndex].mBufferList->mNumberBuffers; ++i)
	m_sliceList[sliceIndex].mBufferList->mBuffers[i].mDataByteSize = byteSize;

	// Do the extraction:
	UInt32 flags = 0;
	UInt32 samplesRead = samplesCount;
	OSStatus err = MovieAudioExtractionFillBuffer(
	m_audioExtractionRef, &samplesRead, m_sliceList[sliceIndex].mBufferList, &flags);
	BACKEND_ASSERT2(err == noErr, "Could not fill audio buffers from audio extraction", FATAL_ERROR)
	m_audioExtractionComplete = (flags & kQTMovieAudioExtractionComplete);

	// Play the slice:
	if (samplesRead != 0 && m_audioUnit != 0){
	m_sliceList[sliceIndex].mNumberFrames = samplesRead;
	err = AudioUnitSetProperty(m_audioUnit,
	kAudioUnitProperty_ScheduleAudioSlice, kAudioUnitScope_Global,
	0, &m_sliceList[sliceIndex], sizeof(ScheduledAudioSlice));
	BACKEND_ASSERT2(err == noErr, "Could not schedule audio buffers on audio unit", FATAL_ERROR)
	} else
	m_sliceList[sliceIndex].mFlags = kScheduledAudioSliceFlag_Complete;

	// Move the window:
	m_sampleTimeStamp += samplesRead;
	if (m_samplesRemaining != -1)
	m_samplesRemaining -= samplesRead;
	}
	}
	}

	#endif // QUICKTIME_C_API_AVAILABLE
	}

	void QuickTimeAudioPlayer::mediaNodeEvent(const MediaNodeEvent *event)
	{
	switch (event->type()){
	case MediaNodeEvent::AudioGraphAboutToBeDeleted:
	case MediaNodeEvent::AboutToRestartAudioStream:
	case MediaNodeEvent::StartConnectionChange:
	m_startTime = currentTime();
	break;
	case MediaNodeEvent::AudioGraphInitialized:
	case MediaNodeEvent::RestartAudioStreamRequest:
	case MediaNodeEvent::EndConnectionChange:
	if (m_state == Playing)
	seek(m_startTime);
	break;
	default:
	break;
	}
	}

	}}

	QT_END_NAMESPACE