Audio: use double for seeking

src/audio/aldatasource.h

@@ -44,7 +44,7 @@ struct ALDataSource
 
 	/* If the source doesn't support seeking, it will
 	 * reset back to the beginning */
-	virtual void seekToOffset(float seconds) = 0;
+	virtual void seekToOffset(double seconds) = 0;
 
 	/* The frame count right after wrap around */
 	virtual uint32_t loopStartFrames() = 0;

src/audio/alstream.cpp

@@ -123,7 +123,7 @@ void ALStream::stop()
 	state = Stopped;
 }
 
-void ALStream::play(float offset)
+void ALStream::play(double offset)
 {
 	if (!source)
 		return;
@@ -184,13 +184,14 @@ ALStream::State ALStream::queryState()
 	return state;
 }
 
-float ALStream::queryOffset()
+double ALStream::queryOffset()
 {
 	if (state == Closed || !source)
 		return 0;
 
-	float procOffset = static_cast<float>(procFrames) / source->sampleRate();
+	double procOffset = static_cast<double>(procFrames) / source->sampleRate();
 
+	// TODO: getSecOffset returns a float, we should improve precision to double.
 	return procOffset + AL::Source::getSecOffset(alSrc);
 }
 
@@ -290,7 +291,7 @@ void ALStream::stopStream()
 	procFrames = 0;
 }
 
-void ALStream::startStream(float offset)
+void ALStream::startStream(double offset)
 {
 	AL::Source::clearQueue(alSrc);
 

src/audio/alstream.h

@@ -64,7 +64,7 @@ struct ALStream
 	AtomicFlag threadTermReq;
 
 	AtomicFlag needsRewind;
-	float startOffset;
+	double startOffset;
 
 	float pitch;
 
@@ -95,21 +95,21 @@ struct ALStream
 	void close();
 	void open(const std::string &filename);
 	void stop();
-	void play(float offset = 0);
+	void play(double offset = 0);
 	void pause();
 
 	void setVolume(float value);
 	void setPitch(float value);
 	State queryState();
-	float queryOffset();
+	double queryOffset();
 	bool queryNativePitch();
 
 private:
 	void closeSource();
 	void openSource(const std::string &filename);
 
 	void stopStream();
-	void startStream(float offset);
+	void startStream(double offset);
 	void pauseStream();
 	void resumeStream();
 

src/audio/audio.cpp

@@ -292,7 +292,7 @@ Audio::Audio(RGSSThreadData &rtData)
 void Audio::bgmPlay(const char *filename,
                     int volume,
                     int pitch,
-                    float pos,
+                    double pos,
                     int track)
 {
     if (track == -127) {
@@ -356,7 +356,7 @@ void Audio::bgmSetVolume(int volume, int track)
 void Audio::bgsPlay(const char *filename,
                     int volume,
                     int pitch,
-                    float pos)
+                    double pos)
 {
 	p->bgs.play(filename, volume, pitch, pos);
 }
@@ -407,12 +407,12 @@ void Audio::setupMidi()
 	shState->midiState().initIfNeeded(shState->config());
 }
 
-float Audio::bgmPos(int track)
+double Audio::bgmPos(int track)
 {
 	return p->getTrackByIndex(track)->playingOffset();
 }
 
-float Audio::bgsPos()
+double Audio::bgsPos()
 {
 	return p->bgs.playingOffset();
 }

src/audio/audio.h

@@ -41,7 +41,7 @@ class Audio
 	void bgmPlay(const char *filename,
 	             int volume = 100,
 	             int pitch = 100,
-	             float pos = 0,
+	             double pos = 0,
                  int track = -127);
 	void bgmStop(int track = -127);
 	void bgmFade(int time, int track = -127);
@@ -51,7 +51,7 @@ class Audio
 	void bgsPlay(const char *filename,
 	             int volume = 100,
 	             int pitch = 100,
-	             float pos = 0);
+	             double pos = 0);
 	void bgsStop();
 	void bgsFade(int time);
 
@@ -67,8 +67,8 @@ class Audio
 	void seStop();
 
 	void setupMidi();
-	float bgmPos(int track = 0);
-	float bgsPos();
+	double bgmPos(int track = 0);
+	double bgsPos();
 
 	void reset();
 

src/audio/audiostream.cpp

@@ -76,7 +76,7 @@ AudioStream::~AudioStream()
 void AudioStream::play(const std::string &filename,
                        int volume,
                        int pitch,
-                       float offset)
+                       double offset)
 {
 	finiFadeOutInt();
 
@@ -222,7 +222,7 @@ void AudioStream::fadeOut(int duration)
 	unlockStream();
 }
 
-void AudioStream::seek(float offset)
+void AudioStream::seek(double offset)
 {
 	lockStream();
 	stream.play(offset);
@@ -253,7 +253,7 @@ float AudioStream::getVolume(VolumeType type)
 	return volumes[type];
 }
 
-float AudioStream::playingOffset()
+double AudioStream::playingOffset()
 {
 	return stream.queryOffset();
 }

src/audio/audiostream.h

@@ -127,10 +127,10 @@ struct AudioStream
 	void play(const std::string &filename,
 	          int volume,
 	          int pitch,
-	          float offset = 0);
+	          double offset = 0);
 	void stop();
 	void fadeOut(int duration);
-	void seek(float offset);
+	void seek(double offset);
 
 	/* Any access to this classes 'stream' member,
 	 * whether state query or modification, must be
@@ -141,7 +141,7 @@ struct AudioStream
 	void setVolume(VolumeType type, float value);
 	float getVolume(VolumeType type);
 
-	float playingOffset();
+	double playingOffset();
 
 private:
 	float volumes[VolumeTypeCount];

src/audio/midisource.cpp

@@ -891,7 +891,7 @@ struct MidiSource : ALDataSource, MidiReadHandler
 	}
 
 	/* Midi sources cannot seek, and so always reset to beginning */
-	void seekToOffset(float)
+	void seekToOffset(double)
 	{
 		/* Reset synth */
 		fluid.synth_system_reset(synth);

src/audio/sdlsoundsource.cpp

@@ -101,12 +101,19 @@ struct SDLSoundSource : ALDataSource
 		return sample->actual.rate;
 	}
 
-	void seekToOffset(float seconds)
+	void seekToOffset(double seconds)
 	{
 		if (seconds <= 0)
+		{
 			Sound_Rewind(sample);
+		}
 		else
+		{
+			// Unfortunately there is no easy API in SDL_sound for seeking with better precision than 1ms.
+			// TODO: Work around this by manually consuming the remaining samples.
+			// TODO: Also we're flooring here when we probably should be rounding.
 			Sound_Seek(sample, static_cast<uint32_t>(seconds * 1000));
+		}
 	}
 
 	uint32_t loopStartFrames()

src/audio/vorbissource.cpp

@@ -156,14 +156,15 @@ struct VorbisSource : ALDataSource
 		return info.rate;
 	}
 
-	void seekToOffset(float seconds)
+	void seekToOffset(double seconds)
 	{
 		if (seconds <= 0)
 		{
 			ov_raw_seek(&vf, 0);
 			currentFrame = 0;
 		}
 
+		// TODO: We're flooring here when we probably should be rounding.
 		currentFrame = seconds * info.rate;
 
 		if (loop.valid && currentFrame > loop.end)