OAL Loops, fixes

src/audio/oal/channel.cpp

@@ -15,6 +15,8 @@ ALuint alFilters[MAXCHANNELS+MAX2DCHANNELS];
 ALuint alBuffers[MAXCHANNELS+MAX2DCHANNELS];
 bool bChannelsCreated = false;
 
+int32 CChannel::channelsThatNeedService = 0;
+
 void
 CChannel::InitChannels()
 {
@@ -59,14 +61,20 @@ void CChannel::SetDefault()
 
 	Position[0] = 0.0f; Position[1] = 0.0f; Position[2] = 0.0f;
 	Distances[0] = 0.0f; Distances[1] = FLT_MAX;
-	LoopCount  = 1;
+
+	LoopCount = 1;
+	LastProcessedOffset = UINT32_MAX;
 	LoopPoints[0] = 0; LoopPoints[1] = -1;
 
 	Frequency = MAX_FREQ;
 }
 
 void CChannel::Reset()
 {
+	// Here is safe because ctor don't call this
+	if (LoopCount > 1)
+		channelsThatNeedService--;
+
 	ClearBuffer();
 	SetDefault();
 }
@@ -165,10 +173,51 @@ void CChannel::SetCurrentFreq(uint32 freq)
 	SetPitch(ALfloat(freq) / Frequency);
 }
 
-void CChannel::SetLoopCount(int32 loopCount) // fake. TODO:
+void CChannel::SetLoopCount(int32 count)
 {
 	if ( !HasSource() ) return;
-	alSourcei(alSources[id], AL_LOOPING, loopCount == 1 ? AL_FALSE : AL_TRUE);
+
+	// 0: loop indefinitely, 1: play one time, 2: play two times etc...
+	// only > 1 needs manual processing
+
+	if (LoopCount > 1 && count < 2)
+		channelsThatNeedService--;
+	else if (LoopCount < 2 && count > 1)
+		channelsThatNeedService++;
+
+	alSourcei(alSources[id], AL_LOOPING, count == 1 ? AL_FALSE : AL_TRUE);
+	LoopCount = count;
+}
+
+bool CChannel::Update()
+{
+	if (!HasSource()) return false;
+	if (LoopCount < 2) return false;
+
+	ALint state;
+	alGetSourcei(alSources[id], AL_SOURCE_STATE, &state);
+	if (state == AL_STOPPED) {
+		debug("Looping channels(%d in this case) shouldn't report AL_STOPPED, but nvm\n", id);
+		SetLoopCount(1);
+		return true;
+	}
+
+	assert(channelsThatNeedService > 0 && "Ref counting is broken");
+
+	ALint offset;
+	alGetSourcei(alSources[id], AL_SAMPLE_OFFSET, &offset);
+
+	// Rewound
+	if (offset < LastProcessedOffset) {
+		LoopCount--;
+		if (LoopCount == 1) {
+			// Playing last tune...
+			channelsThatNeedService--;
+			alSourcei(alSources[id], AL_LOOPING, AL_FALSE);
+		}
+	}
+	LastProcessedOffset = offset;
+	return true;
 }
 
 void CChannel::SetLoopPoints(ALint start, ALint end)
@@ -200,6 +249,7 @@ void CChannel::SetPan(int32 pan)
 void CChannel::ClearBuffer()
 {
 	if ( !HasSource() ) return;
+	alSourcei(alSources[id], AL_LOOPING, AL_FALSE);
 	alSourcei(alSources[id], AL_BUFFER, AL_NONE);
 	Data = nil;
 	DataSize = 0;

src/audio/oal/channel.h

@@ -19,7 +19,10 @@ class CChannel
 	float  Distances[2];
 	int32  LoopCount;
 	ALint  LoopPoints[2];
+	ALint  LastProcessedOffset;
 public:
+	static int32 channelsThatNeedService;
+
 	static void InitChannels();
 	static void DestroyChannels();
 
@@ -37,14 +40,15 @@ class CChannel
 	void SetVolume(int32 vol);
 	void SetSampleData(void *_data, size_t _DataSize, int32 freq);
 	void SetCurrentFreq(uint32 freq);
-	void SetLoopCount(int32 loopCount); // fake
+	void SetLoopCount(int32 count);
 	void SetLoopPoints(ALint start, ALint end);
 	void SetPosition(float x, float y, float z);
 	void SetDistances(float max, float min);
 	void SetPan(int32 pan);
 	void ClearBuffer();
 	void SetReverbMix(ALuint slot, float mix);
 	void UpdateReverb(ALuint slot);
+	bool Update();
 };
 
 #endif

src/audio/oal/stream.cpp

@@ -499,6 +499,7 @@ class CMP3File : public IDecoder
 
 			m_bOpened = mpg123_open(m_pMH, path) == MPG123_OK
 				&& mpg123_getformat(m_pMH, &rate, &channels, &encoding) == MPG123_OK;
+
 			m_nRate = rate;
 			m_nChannels = channels;
 
@@ -980,7 +981,8 @@ CStream::CStream(char *filename, ALuint *sources, ALuint (&buffers)[NUM_STREAMBU
 	m_bReset(false),
 	m_nVolume(0),
 	m_nPan(0),
-	m_nPosBeforeReset(0)
+	m_nPosBeforeReset(0),
+	m_nLoopCount(1)
 
 {
 // Be case-insensitive on linux (from https://github.com/OneSadCookie/fcaseopen/)
@@ -1078,7 +1080,7 @@ bool CStream::IsPlaying()
 		ALint sourceState[2];
 		alGetSourcei(m_pAlSources[0], AL_SOURCE_STATE, &sourceState[0]);
 		alGetSourcei(m_pAlSources[1], AL_SOURCE_STATE, &sourceState[1]);
-		if ( m_bActive || sourceState[0] == AL_PLAYING || sourceState[1] == AL_PLAYING)
+		if (sourceState[0] == AL_PLAYING || sourceState[1] == AL_PLAYING)
 			return true;
 	}
 
@@ -1236,6 +1238,8 @@ bool CStream::Setup()
 {
 	if ( IsOpened() )
 	{
+		alSourcei(m_pAlSources[0], AL_LOOPING, AL_FALSE);
+		alSourcei(m_pAlSources[1], AL_LOOPING, AL_FALSE);
 		m_pSoundFile->Seek(0);
 		//SetPosition(0.0f, 0.0f, 0.0f);
 		SetPitch(1.0f);
@@ -1246,6 +1250,13 @@ bool CStream::Setup()
 	return IsOpened();
 }
 
+void CStream::SetLoopCount(int32 count)
+{
+	if ( !HasSource() ) return;
+
+	m_nLoopCount = count;
+}
+
 void CStream::SetPlay(bool state)
 {
 	if ( !HasSource() ) return;
@@ -1305,52 +1316,59 @@ void CStream::Update()
 
 	if ( !m_bPaused )
 	{
-		ALint sourceState[2];
+		ALint totalBuffers[2] = { 0, 0 };
 		ALint buffersProcessed[2] = { 0, 0 };
 
 		// Relying a lot on left buffer states in here
 
 		do
 		{
 			//alSourcef(m_pAlSources[0], AL_ROLLOFF_FACTOR, 0.0f);
-			alGetSourcei(m_pAlSources[0], AL_SOURCE_STATE, &sourceState[0]);
+			alGetSourcei(m_pAlSources[0], AL_BUFFERS_QUEUED, &totalBuffers[0]);
 			alGetSourcei(m_pAlSources[0], AL_BUFFERS_PROCESSED, &buffersProcessed[0]);
 			//alSourcef(m_pAlSources[1], AL_ROLLOFF_FACTOR, 0.0f);
-			alGetSourcei(m_pAlSources[1], AL_SOURCE_STATE, &sourceState[1]);
+			alGetSourcei(m_pAlSources[1], AL_BUFFERS_QUEUED, &totalBuffers[1]);
 			alGetSourcei(m_pAlSources[1], AL_BUFFERS_PROCESSED, &buffersProcessed[1]);
 		} while (buffersProcessed[0] != buffersProcessed[1]);
 
-		ALint looping = AL_FALSE;
-		alGetSourcei(m_pAlSources[0], AL_LOOPING, &looping);
-
-		if ( looping == AL_TRUE )
-		{
-			TRACE("stream set looping");
-			alSourcei(m_pAlSources[0], AL_LOOPING, AL_TRUE);
-			alSourcei(m_pAlSources[1], AL_LOOPING, AL_TRUE);
-		}
-
 		assert(buffersProcessed[0] == buffersProcessed[1]);
 
-		while( buffersProcessed[0]-- )
+		// Correcting OpenAL concepts here:
+		// AL_BUFFERS_QUEUED = Number of *all* buffers in queue, including processed, processing and pending
+		// AL_BUFFERS_PROCESSED = Index of the buffer being processing right now. Buffers coming after that(have greater index) are pending buffers.
+		// which means: totalBuffers[0] - buffersProcessed[0] = pending buffers
+
+		bool buffersRefilled = false;
+
+		// We should wait queue to be cleared to loop track, because position calculation relies on queue.
+		if (m_nLoopCount != 1 && m_bActive && totalBuffers[0] == 0)
 		{
-			ALuint buffer[2];
-
-			alSourceUnqueueBuffers(m_pAlSources[0], 1, &buffer[0]);
-			alSourceUnqueueBuffers(m_pAlSources[1], 1, &buffer[1]);
-
-			if (m_bActive && FillBuffer(buffer))
-			{
-				alSourceQueueBuffers(m_pAlSources[0], 1, &buffer[0]);
-				alSourceQueueBuffers(m_pAlSources[1], 1, &buffer[1]);
-			}
+			Setup();
+			buffersRefilled = FillBuffers() != 0;
+			if (m_nLoopCount != 0)
+				m_nLoopCount--;
 		}
-
-		if ( sourceState[0] != AL_PLAYING )
+		else
 		{
-			alGetSourcei(m_pAlSources[0], AL_BUFFERS_PROCESSED, &buffersProcessed[0]);
-			SetPlay(buffersProcessed[0]!=0);
+			while( buffersProcessed[0]-- )
+			{
+				ALuint buffer[2];
+
+				alSourceUnqueueBuffers(m_pAlSources[0], 1, &buffer[0]);
+				alSourceUnqueueBuffers(m_pAlSources[1], 1, &buffer[1]);
+
+				if (m_bActive && FillBuffer(buffer))
+				{
+					buffersRefilled = true;
+					alSourceQueueBuffers(m_pAlSources[0], 1, &buffer[0]);
+					alSourceQueueBuffers(m_pAlSources[1], 1, &buffer[1]);
+				}
+			}
 		}
+
+		// Two reasons: 1-Source may be starved to audio and stopped itself, 2- We're already waiting it to starve and die for looping track!
+		if (m_bActive && (buffersRefilled || (totalBuffers[1] - buffersProcessed[1] != 0)))
+			SetPlay(true);
 	}
 }
 
@@ -1362,6 +1380,7 @@ void CStream::ProviderInit()
 		{
 			SetPan(m_nPan);
 			SetVolume(m_nVolume);
+			SetLoopCount(m_nLoopCount);
 			SetPosMS(m_nPosBeforeReset);
 			if (m_bActive)
 				FillBuffers();

src/audio/oal/stream.h

@@ -69,6 +69,7 @@ class CStream
 	uint32   m_nVolume;
 	uint8    m_nPan;
 	uint32   m_nPosBeforeReset;
+	int32   m_nLoopCount;
 
 	IDecoder *m_pSoundFile;
 
@@ -103,6 +104,8 @@ class CStream
 	void Start();
 	void Stop();
 	void Update(void);
+	void SetLoopCount(int32);
+
 
 	void ProviderInit();
 	void ProviderTerm();