support per-sample volume

stepmania/src/arch/Sound/DSoundHelpers.cpp

@@ -135,6 +135,7 @@ DSoundBuf::DSoundBuf(DSound &ds, DSoundBuf::hw hardware,
 	samplerate = samplerate_;
 	samplebits = samplebits_;
 	writeahead = writeahead_;
+	volume = 0;
 	buffer_locked = false;
 	last_cursor_pos = write_cursor = buffer_bytes_filled = 0;
 	LastPosition = 0;
@@ -254,9 +255,14 @@ void DSoundBuf::SetVolume(float vol)
 		vol = 0.001f;		// fix log10f(0) == -INF
 	float vl2 = log10f(vol) / log10f(2); /* vol log 2 */
 
-	/* Volume is a multiplier; SetVolume wants attenuation in thousands of a
+	/* Volume is a multiplier; SetVolume wants attenuation in thousands of a decibel. */
-	 * decibel. */
+	const int new_volume = max( int(1000 * vl2), DSBVOLUME_MIN );
-	buf->SetVolume(max(int(1000 * vl2), DSBVOLUME_MIN));
+
+	if( volume == new_volume )
+		return;
+	volume = new_volume;
+
+	buf->SetVolume( volume );
 }
 
 /* Determine if "pos" is between "start" and "end", for a circular buffer. */

stepmania/src/arch/Sound/DSoundHelpers.h

@@ -30,6 +30,7 @@ class DSoundBuf
 	IDirectSoundBuffer *buf;
 
 	int channels, samplerate, samplebits, writeahead;
+	int volume;
 
 	int buffersize;
 	

stepmania/src/arch/Sound/RageSoundDriver_DSound.cpp

@@ -123,6 +123,8 @@ bool RageSound_DSound::stream::GetData(bool init)
 	 * fill anything in STOPPING; in that case, we just clear the audio buffer. */
 	if(state != STOPPING)
 	{
+		pcm->SetVolume( snd->GetVolume() );
+
 		int bytes_read = 0;
 		int bytes_left = len;
 
@@ -236,14 +238,6 @@ RageSound_DSound::~RageSound_DSound()
 		delete stream_pool[i];
 }
 
-void RageSound_DSound::VolumeChanged()
-{
-	for(unsigned i = 0; i < stream_pool.size(); ++i)
-	{
-		stream_pool[i]->pcm->SetVolume(SOUNDMAN->GetMixVolume());
-	}
-}
-
 void RageSound_DSound::StartMixing( RageSoundBase *snd )
 {
 	LockMutex L(SOUNDMAN->lock);

stepmania/src/arch/Sound/RageSoundDriver_DSound.h

@@ -49,7 +49,6 @@ class RageSound_DSound: public RageSoundDriver
 	void StopMixing( RageSoundBase *snd );		/* used by RageSound */
 	int64_t GetPosition( const RageSoundBase *snd ) const;
 	void Update(float delta);
-	void VolumeChanged();
 
 	int GetSampleRate( int rate ) const { return rate; }
 

stepmania/src/arch/Sound/RageSoundDriver_DSound_Software.cpp

@@ -14,7 +14,7 @@
 const int channels = 2;
 const int bytes_per_frame = channels*2; /* 16-bit */
 const int samplerate = 44100;
-const int buffersize_frames = 1024*4;	/* in frames */
+const int buffersize_frames = 1024*16;	/* in frames */
 const int buffersize = buffersize_frames * bytes_per_frame; /* in bytes */
 
 /* We'll fill the buffer in chunks this big.  This should evenly divide the
@@ -80,7 +80,6 @@ bool RageSound_DSound_Software::GetData()
 	memset(buf, 0, bufsize*sizeof(Uint16));
 
 	static SoundMixBuffer mix;
-	mix.SetVolume( SOUNDMAN->GetMixVolume() );
 
 	for(unsigned i = 0; i < sounds.size(); ++i)
 	{
@@ -114,7 +113,7 @@ bool RageSound_DSound_Software::GetData()
         bytes_read += got;
         bytes_left -= got;
 
-		mix.write( (Sint16 *) buf, bytes_read / sizeof(Sint16) );
+		mix.write( (Sint16 *) buf, bytes_read / sizeof(Sint16), sounds[i]->snd->GetVolume() );
 
 		if( bytes_left > 0 )
 		{

stepmania/src/arch/Sound/RageSoundDriver_WaveOut.cpp

@@ -78,7 +78,6 @@ bool RageSound_WaveOut::GetData()
 	memset(buf, 0, bufsize*sizeof(Uint16));
 	memset(buffers[b].lpData, 0, bufsize*sizeof(Uint16));
 	static SoundMixBuffer mix;
-	mix.SetVolume( SOUNDMAN->GetMixVolume() );
 
 	const int64_t play_pos = last_cursor_pos;
     const int64_t cur_play_pos = GetPosition( NULL );
@@ -113,7 +112,7 @@ bool RageSound_WaveOut::GetData()
         bytes_read += got;
         bytes_left -= got;
 
-		mix.write( (Sint16 *) buf, bytes_read / sizeof(Sint16) );
+		mix.write( (Sint16 *) buf, bytes_read / sizeof(Sint16), sounds[i]->snd->GetVolume() );
 
 		if( bytes_left > 0 )
 		{