doom3-bfg/neo/sound/OpenAL/AL_SoundVoice.cpp

/*
===========================================================================

Doom 3 BFG Edition GPL Source Code
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
Copyright (C) 2013 Robert Beckebans

This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").

Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Doom 3 BFG Edition Source Code 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/
#pragma hdrstop
#include "precompiled.h"
#include "../snd_local.h"

idCVar s_skipHardwareSets( "s_skipHardwareSets", "0", CVAR_BOOL, "Do all calculation, but skip XA2 calls" );
idCVar s_debugHardware( "s_debugHardware", "1", CVAR_BOOL, "Print a message any time a hardware voice changes" );

// The whole system runs at this sample rate
static int SYSTEM_SAMPLE_RATE = 44100;
static float ONE_OVER_SYSTEM_SAMPLE_RATE = 1.0f / SYSTEM_SAMPLE_RATE;

/*
========================
idStreamingVoiceContext
========================
*/
/*
class idStreamingVoiceContext : public IXAudio2VoiceCallback
{
public:
	STDMETHOD_( void, OnVoiceProcessingPassStart )( UINT32 BytesRequired ) {}
	STDMETHOD_( void, OnVoiceProcessingPassEnd )() {}
	STDMETHOD_( void, OnStreamEnd )() {}
	STDMETHOD_( void, OnBufferStart )( void* pContext )
	{
		idSoundSystemLocal::bufferContext_t* bufferContext = ( idSoundSystemLocal::bufferContext_t* ) pContext;
		bufferContext->voice->OnBufferStart( bufferContext->sample, bufferContext->bufferNumber );
	}
	STDMETHOD_( void, OnLoopEnd )( void* ) {}
	STDMETHOD_( void, OnVoiceError )( void*, HRESULT hr )
	{
		idLib::Warning( "OnVoiceError( %d )", hr );
	}
	STDMETHOD_( void, OnBufferEnd )( void* pContext )
	{
		idSoundSystemLocal::bufferContext_t* bufferContext = ( idSoundSystemLocal::bufferContext_t* ) pContext;
		soundSystemLocal.ReleaseStreamBufferContext( bufferContext );
	}
} streamContext;
*/

/*
========================
idSoundVoice_OpenAL::idSoundVoice_OpenAL
========================
*/
idSoundVoice_OpenAL::idSoundVoice_OpenAL()
	:
	triggered( false ),
	openalSource( 0 ),
	leadinSample( NULL ),
	loopingSample( NULL ),
	formatTag( 0 ),
	numChannels( 0 ),
	sampleRate( 0 ),
	paused( true ),
	hasVUMeter( false )
{

}

/*
========================
idSoundVoice_OpenAL::~idSoundVoice_OpenAL
========================
*/
idSoundVoice_OpenAL::~idSoundVoice_OpenAL()
{
	DestroyInternal();
}

/*
========================
idSoundVoice_OpenAL::CompatibleFormat
========================
*/
bool idSoundVoice_OpenAL::CompatibleFormat( idSoundSample_OpenAL* s )
{
	if( alIsSource( openalSource ) )
	{
		// If this voice has never been allocated, then it's compatible with everything
		return true;
	}
	
	return false;
}

/*
========================
idSoundVoice_OpenAL::Create
========================
*/
void idSoundVoice_OpenAL::Create( const idSoundSample* leadinSample_, const idSoundSample* loopingSample_ )
{
	if( IsPlaying() )
	{
		// This should never hit
		Stop();
		return;
	}
	
	triggered = true;
	
	leadinSample = ( idSoundSample_OpenAL* )leadinSample_;
	loopingSample = ( idSoundSample_OpenAL* )loopingSample_;
	
	if( alIsSource( openalSource ) && CompatibleFormat( leadinSample ) )
	{
		sampleRate = leadinSample->format.basic.samplesPerSec;
	}
	else
	{
		DestroyInternal();
		formatTag = leadinSample->format.basic.formatTag;
		numChannels = leadinSample->format.basic.numChannels;
		sampleRate = leadinSample->format.basic.samplesPerSec;
		
		//soundSystemLocal.hardware.pXAudio2->CreateSourceVoice( &pSourceVoice, ( const WAVEFORMATEX* )&leadinSample->format, XAUDIO2_VOICE_USEFILTER, 4.0f, &streamContext );
		
		alGetError();
		alGenSources( 1, &openalSource );
		if( alGetError() != AL_NO_ERROR )
			//if( pSourceVoice == NULL )
		{
			// If this hits, then we are most likely passing an invalid sample format, which should have been caught by the loader (and the sample defaulted)
			return;
		}
		
		alSourcef( openalSource, AL_ROLLOFF_FACTOR, 0.0f );
		
		// handle streaming sounds (decode on the fly) both single shot AND looping
		//if( triggered )
		{
			alSourcei( openalSource, AL_BUFFER, 0 );
			alDeleteBuffers( 3, &lastopenalStreamingBuffer[0] );
			lastopenalStreamingBuffer[0] = openalStreamingBuffer[0];
			lastopenalStreamingBuffer[1] = openalStreamingBuffer[1];
			lastopenalStreamingBuffer[2] = openalStreamingBuffer[2];
			
			alGenBuffers( 3, &openalStreamingBuffer[0] );
			/*
			if( soundSystemLocal.alEAXSetBufferMode )
			{
				soundSystemLocal.alEAXSetBufferMode( 3, &chan->openalStreamingBuffer[0], alGetEnumValue( ID_ALCHAR "AL_STORAGE_ACCESSIBLE" ) );
			}
			*/
			openalStreamingBuffer[0];
			openalStreamingBuffer[1];
			openalStreamingBuffer[2];
		}
		
		if( s_debugHardware.GetBool() )
		{
			if( loopingSample == NULL || loopingSample == leadinSample )
			{
				idLib::Printf( "%dms: %i created for %s\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>" );
			}
			else
			{
				idLib::Printf( "%dms: %i created for %s and %s\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>", loopingSample ? loopingSample->GetName() : "<null>" );
			}
		}
	}
	
	sourceVoiceRate = sampleRate;
	//pSourceVoice->SetSourceSampleRate( sampleRate );
	//pSourceVoice->SetVolume( 0.0f );
	
	alSourcei( openalSource, AL_SOURCE_RELATIVE, AL_TRUE );
	alSource3f( openalSource, AL_POSITION, 0.0f, 0.0f, 0.0f );
	
	// RB: FIXME 0.0f ?
	alSourcef( openalSource, AL_GAIN, 0.0f );
	
	//OnBufferStart( leadinSample, 0 );
}

/*
========================
idSoundVoice_OpenAL::DestroyInternal
========================
*/
void idSoundVoice_OpenAL::DestroyInternal()
{
	if( alIsSource( openalSource ) )
	{
		if( s_debugHardware.GetBool() )
		{
			idLib::Printf( "%dms: %i destroyed\n", Sys_Milliseconds(), openalSource );
		}
		
		alDeleteSources( 1, &openalSource );
		openalSource = 0;
		
		hasVUMeter = false;
	}
}

/*
========================
idSoundVoice_OpenAL::Start
========================
*/
void idSoundVoice_OpenAL::Start( int offsetMS, int ssFlags )
{
	if( s_debugHardware.GetBool() )
	{
		idLib::Printf( "%dms: %i starting %s @ %dms\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>", offsetMS );
	}
	
	if( !leadinSample )
	{
		return;
	}
	
	if( !alIsSource( openalSource ) )
	{
		return;
	}
	
	if( leadinSample->IsDefault() )
	{
		idLib::Warning( "Starting defaulted sound sample %s", leadinSample->GetName() );
	}
	
	bool flicker = ( ssFlags & SSF_NO_FLICKER ) == 0;
	
	if( flicker != hasVUMeter )
	{
		hasVUMeter = flicker;
		
		/*
		if( flicker )
		{
			IUnknown* vuMeter = NULL;
		
			if( XAudio2CreateVolumeMeter( &vuMeter, 0 ) == S_OK )
			{
		
				XAUDIO2_EFFECT_DESCRIPTOR descriptor;
				descriptor.InitialState = true;
				descriptor.OutputChannels = leadinSample->NumChannels();
				descriptor.pEffect = vuMeter;
		
				XAUDIO2_EFFECT_CHAIN chain;
				chain.EffectCount = 1;
				chain.pEffectDescriptors = &descriptor;
		
				pSourceVoice->SetEffectChain( &chain );
		
				vuMeter->Release();
			}
		}
		else
		{
			pSourceVoice->SetEffectChain( NULL );
		}
		*/
	}
	
	assert( offsetMS >= 0 );
	int offsetSamples = MsecToSamples( offsetMS, leadinSample->SampleRate() );
	if( loopingSample == NULL && offsetSamples >= leadinSample->playLength )
	{
		return;
	}
	
	RestartAt( offsetSamples );
	Update();
	UnPause();
}

/*
========================
idSoundVoice_OpenAL::RestartAt
========================
*/
int idSoundVoice_OpenAL::RestartAt( int offsetSamples )
{
	offsetSamples &= ~127;
	
	idSoundSample_OpenAL* sample = leadinSample;
	if( offsetSamples >= leadinSample->playLength )
	{
		if( loopingSample != NULL )
		{
			offsetSamples %= loopingSample->playLength;
			sample = loopingSample;
		}
		else
		{
			return 0;
		}
	}
	
	int previousNumSamples = 0;
	for( int i = 0; i < sample->buffers.Num(); i++ )
	{
		if( sample->buffers[i].numSamples > sample->playBegin + offsetSamples )
		{
			return SubmitBuffer( sample, i, sample->playBegin + offsetSamples - previousNumSamples );
		}
		previousNumSamples = sample->buffers[i].numSamples;
	}
	
	return 0;
}

/*
========================
idSoundVoice_OpenAL::SubmitBuffer
========================
*/
int idSoundVoice_OpenAL::SubmitBuffer( idSoundSample_OpenAL* sample, int bufferNumber, int offset )
{
	if( sample == NULL || ( bufferNumber < 0 ) || ( bufferNumber >= sample->buffers.Num() ) )
	{
		return 0;
	}
	
#if 0
	idSoundSystemLocal::bufferContext_t* bufferContext = soundSystemLocal.ObtainStreamBufferContext();
	if( bufferContext == NULL )
	{
		idLib::Warning( "No free buffer contexts!" );
		return 0;
	}
	
	bufferContext->voice = this;
	bufferContext->sample = sample;
	bufferContext->bufferNumber = bufferNumber;
#endif
	
	// TODO openal stream
	
	ALint finishedbuffers;
	
	if( !triggered )
	{
		alGetSourcei( openalSource, AL_BUFFERS_PROCESSED, &finishedbuffers );
		alSourceUnqueueBuffers( openalSource, finishedbuffers, &openalStreamingBuffer[0] );
		if( finishedbuffers == 3 )
		{
			triggered = true;
		}
	}
	else
	{
		finishedbuffers = 3;
	}
	
	ALenum format;
	
	if( sample->format.basic.formatTag == idWaveFile::FORMAT_PCM )
	{
		format = sample->NumChannels() == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
	}
	else if( sample->format.basic.formatTag == idWaveFile::FORMAT_ADPCM )
	{
		format = sample->NumChannels() == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
	}
	else if( sample->format.basic.formatTag == idWaveFile::FORMAT_XMA2 )
	{
		format = sample->NumChannels() == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
	}
	else
	{
		format = sample->NumChannels() == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
	}
	
	int rate = sample->SampleRate(); /*44100*/
	
	for( int j = 0; j < finishedbuffers && j < 1; j++ )
	{
		/*
		chan->GatherChannelSamples( chan->openalStreamingOffset * sample->objectInfo.nChannels, MIXBUFFER_SAMPLES * sample->objectInfo.nChannels, alignedInputSamples );
		for( int i = 0; i < ( MIXBUFFER_SAMPLES * sample->objectInfo.nChannels ); i++ )
		{
			if( alignedInputSamples[i] < -32768.0f )
				( ( short* )alignedInputSamples )[i] = -32768;
			else if( alignedInputSamples[i] > 32767.0f )
				( ( short* )alignedInputSamples )[i] = 32767;
			else
				( ( short* )alignedInputSamples )[i] = idMath::FtoiFast( alignedInputSamples[i] );
		}
		*/
		
		//alBufferData( buffers[0], sample->NumChannels() == 1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16, sample->buffers[bufferNumber].buffer, sample->buffers[bufferNumber].bufferSize, sample->SampleRate() /*44100*/ );
		
		
		
		
		alBufferData( openalStreamingBuffer[j], format, sample->buffers[bufferNumber].buffer, sample->buffers[bufferNumber].bufferSize, rate );
		//openalStreamingOffset += MIXBUFFER_SAMPLES;
	}
	
	if( finishedbuffers > 0 )
	{
		//alSourceQueueBuffers( openalSource, finishedbuffers, &buffers[0] );
		alSourceQueueBuffers( openalSource, 1, &openalStreamingBuffer[0] );
		
		if( bufferNumber == 0 )
		{
			alSourcePlay( openalSource );
			triggered = false;
		}
		
		return sample->buffers[bufferNumber].bufferSize;
	}
	
	// should never happen
	return 0;
	
	/*
	
	XAUDIO2_BUFFER buffer = { 0 };
	if( offset > 0 )
	{
		int previousNumSamples = 0;
		if( bufferNumber > 0 )
		{
			previousNumSamples = sample->buffers[bufferNumber - 1].numSamples;
		}
		buffer.PlayBegin = offset;
		buffer.PlayLength = sample->buffers[bufferNumber].numSamples - previousNumSamples - offset;
	}
	buffer.AudioBytes = sample->buffers[bufferNumber].bufferSize;
	buffer.pAudioData = ( BYTE* )sample->buffers[bufferNumber].buffer;
	buffer.pContext = bufferContext;
	if( ( loopingSample == NULL ) && ( bufferNumber == sample->buffers.Num() - 1 ) )
	{
		buffer.Flags = XAUDIO2_END_OF_STREAM;
	}
	pSourceVoice->SubmitSourceBuffer( &buffer );
	
	return buffer.AudioBytes;
	
	*/
}

/*
========================
idSoundVoice_OpenAL::Update
========================
*/
bool idSoundVoice_OpenAL::Update()
{
	/*
	if( pSourceVoice == NULL || leadinSample == NULL )
	{
		return false;
	}
	
	XAUDIO2_VOICE_STATE state;
	pSourceVoice->GetState( &state );
	
	const int srcChannels = leadinSample->NumChannels();
	
	float pLevelMatrix[ MAX_CHANNELS_PER_VOICE * MAX_CHANNELS_PER_VOICE ] = { 0 };
	CalculateSurround( srcChannels, pLevelMatrix, 1.0f );
	
	if( s_skipHardwareSets.GetBool() )
	{
		return true;
	}
	
	pSourceVoice->SetOutputMatrix( soundSystemLocal.hardware.pMasterVoice, srcChannels, dstChannels, pLevelMatrix, OPERATION_SET );
	
	assert( idMath::Fabs( gain ) <= XAUDIO2_MAX_VOLUME_LEVEL );
	pSourceVoice->SetVolume( gain, OPERATION_SET );
	
	SetSampleRate( sampleRate, OPERATION_SET );
	
	// we don't do this any longer because we pause and unpause explicitly when the soundworld is paused or unpaused
	// UnPause();
	*/
	return true;
}

/*
========================
idSoundVoice_OpenAL::IsPlaying
========================
*/
bool idSoundVoice_OpenAL::IsPlaying()
{
	if( !alIsSource( openalSource ) )
	{
		return false;
	}
	
	ALint state = AL_INITIAL;
	
	alGetSourcei( openalSource, AL_SOURCE_STATE, &state );
	
	return ( state == AL_PLAYING );
	
	//XAUDIO2_VOICE_STATE state;
	//pSourceVoice->GetState( &state );
	
	//return ( state.BuffersQueued != 0 );
}

/*
========================
idSoundVoice_OpenAL::FlushSourceBuffers
========================
*/
void idSoundVoice_OpenAL::FlushSourceBuffers()
{
	if( alIsSource( openalSource ) )
	{
		//pSourceVoice->FlushSourceBuffers();
	}
}

/*
========================
idSoundVoice_OpenAL::Pause
========================
*/
void idSoundVoice_OpenAL::Pause()
{
	if( !alIsSource( openalSource ) || paused )
	{
		return;
	}
	
	if( s_debugHardware.GetBool() )
	{
		idLib::Printf( "%dms: %i pausing %s\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>" );
	}
	
	alSourcePause( openalSource );
	//pSourceVoice->Stop( 0, OPERATION_SET );
	paused = true;
}

/*
========================
idSoundVoice_OpenAL::UnPause
========================
*/
void idSoundVoice_OpenAL::UnPause()
{
	if( !alIsSource( openalSource ) || !paused )
	{
		return;
	}
	
	if( s_debugHardware.GetBool() )
	{
		idLib::Printf( "%dms: %i unpausing %s\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>" );
	}
	
	alSourcePlay( openalSource );
	//pSourceVoice->Start( 0, OPERATION_SET );
	paused = false;
}

/*
========================
idSoundVoice_OpenAL::Stop
========================
*/
void idSoundVoice_OpenAL::Stop()
{
	if( !alIsSource( openalSource ) )
	{
		return;
	}
	
	if( !paused )
	{
		if( s_debugHardware.GetBool() )
		{
			idLib::Printf( "%dms: %i stopping %s\n", Sys_Milliseconds(), openalSource, leadinSample ? leadinSample->GetName() : "<null>" );
		}
		
		alSourceStop( openalSource );
		alSourcei( openalSource, AL_BUFFER, 0 );
		
		if( openalStreamingBuffer[0] && openalStreamingBuffer[1] && openalStreamingBuffer[2] )
		{
			alGetError();
			alDeleteBuffers( 3, &openalStreamingBuffer[0] );
			if( alGetError() == AL_NO_ERROR )
			{
				openalStreamingBuffer[0] = openalStreamingBuffer[1] = openalStreamingBuffer[2] = 0;
			}
		}
		
		if( lastopenalStreamingBuffer[0] && lastopenalStreamingBuffer[1] && lastopenalStreamingBuffer[2] )
		{
			alGetError();
			alDeleteBuffers( 3, &lastopenalStreamingBuffer[0] );
			if( alGetError() == AL_NO_ERROR )
			{
				lastopenalStreamingBuffer[0] = lastopenalStreamingBuffer[1] = lastopenalStreamingBuffer[2] = 0;
			}
		}
		
		openalStreamingOffset = 0;
		//openalStreamingBuffer[0] = openalStreamingBuffer[1] = openalStreamingBuffer[2] = 0;
		//lastopenalStreamingBuffer[0] = lastopenalStreamingBuffer[1] = lastopenalStreamingBuffer[2] = 0;
		
		//pSourceVoice->Stop( 0, OPERATION_SET );
		paused = true;
	}
}

/*
========================
idSoundVoice_OpenAL::GetAmplitude
========================
*/
float idSoundVoice_OpenAL::GetAmplitude()
{
	// TODO
	return 1.0f;
	
	/*
	if( !hasVUMeter )
	{
		return 1.0f;
	}
	
	float peakLevels[ MAX_CHANNELS_PER_VOICE ];
	float rmsLevels[ MAX_CHANNELS_PER_VOICE ];
	
	XAUDIO2FX_VOLUMEMETER_LEVELS levels;
	levels.ChannelCount = leadinSample->NumChannels();
	levels.pPeakLevels = peakLevels;
	levels.pRMSLevels = rmsLevels;
	
	if( levels.ChannelCount > MAX_CHANNELS_PER_VOICE )
	{
		levels.ChannelCount = MAX_CHANNELS_PER_VOICE;
	}
	
	if( pSourceVoice->GetEffectParameters( 0, &levels, sizeof( levels ) ) != S_OK )
	{
		return 0.0f;
	}
	
	if( levels.ChannelCount == 1 )
	{
		return rmsLevels[0];
	}
	
	float rms = 0.0f;
	for( uint32 i = 0; i < levels.ChannelCount; i++ )
	{
		rms += rmsLevels[i];
	}
	
	return rms / ( float )levels.ChannelCount;
	*/
}

/*
========================
idSoundVoice_OpenAL::ResetSampleRate
========================
*/
void idSoundVoice_OpenAL::SetSampleRate( uint32 newSampleRate, uint32 operationSet )
{
	/*
	if( pSourceVoice == NULL || leadinSample == NULL )
	{
		return;
	}
	
	sampleRate = newSampleRate;
	
	XAUDIO2_FILTER_PARAMETERS filter;
	filter.Type = LowPassFilter;
	filter.OneOverQ = 1.0f;			// [0.0f, XAUDIO2_MAX_FILTER_ONEOVERQ]
	float cutoffFrequency = 1000.0f / Max( 0.01f, occlusion );
	if( cutoffFrequency * 6.0f >= ( float )sampleRate )
	{
		filter.Frequency = XAUDIO2_MAX_FILTER_FREQUENCY;
	}
	else
	{
		filter.Frequency = 2.0f * idMath::Sin( idMath::PI * cutoffFrequency / ( float )sampleRate );
	}
	assert( filter.Frequency >= 0.0f && filter.Frequency <= XAUDIO2_MAX_FILTER_FREQUENCY );
	filter.Frequency = idMath::ClampFloat( 0.0f, XAUDIO2_MAX_FILTER_FREQUENCY, filter.Frequency );
	
	pSourceVoice->SetFilterParameters( &filter, operationSet );
	
	float freqRatio = pitch * ( float )sampleRate / ( float )sourceVoiceRate;
	assert( freqRatio >= XAUDIO2_MIN_FREQ_RATIO && freqRatio <= XAUDIO2_MAX_FREQ_RATIO );
	freqRatio = idMath::ClampFloat( XAUDIO2_MIN_FREQ_RATIO, XAUDIO2_MAX_FREQ_RATIO, freqRatio );
	
	// if the value specified for maxFreqRatio is too high for the specified format, the call to CreateSourceVoice will fail
	if( numChannels == 1 )
	{
		assert( freqRatio * ( float )SYSTEM_SAMPLE_RATE <= XAUDIO2_MAX_RATIO_TIMES_RATE_XMA_MONO );
	}
	else
	{
		assert( freqRatio * ( float )SYSTEM_SAMPLE_RATE <= XAUDIO2_MAX_RATIO_TIMES_RATE_XMA_MULTICHANNEL );
	}
	
	pSourceVoice->SetFrequencyRatio( freqRatio, operationSet );
	*/
}

/*
========================
idSoundVoice_OpenAL::OnBufferStart
========================
*/
void idSoundVoice_OpenAL::OnBufferStart( idSoundSample_OpenAL* sample, int bufferNumber )
{
	//SetSampleRate( sample->SampleRate(), XAUDIO2_COMMIT_NOW );
	
	idSoundSample_OpenAL* nextSample = sample;
	int nextBuffer = bufferNumber + 1;
	if( nextBuffer == sample->buffers.Num() )
	{
		if( sample == leadinSample )
		{
			if( loopingSample == NULL )
			{
				return;
			}
			nextSample = loopingSample;
		}
		nextBuffer = 0;
	}
	
	SubmitBuffer( nextSample, nextBuffer, 0 );
}