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Minor optimization: don't call AudioGetHostClockFrequency() or do a double precision divide over and over.

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This commit is contained in:
Steve Checkoway
2007-11-24 22:38:10 +00:00
parent 270e09d9bc
commit 92e41d40da
2 changed files with 6 additions and 6 deletions
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stepmania/src/arch/Sound/RageSoundDriver_AU.cpp
+5 -6
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@@ -98,9 +98,10 @@ RString RageSoundDriver_AU::Init()
streamFormat.mChannelsPerFrame = kChannelsPerFrame; streamFormat.mChannelsPerFrame = kChannelsPerFrame;
streamFormat.mBitsPerChannel = kBitsPerChannel; streamFormat.mBitsPerChannel = kBitsPerChannel;
if( streamFormat.mSampleRate <= 0 ) if( streamFormat.mSampleRate <= 0.0 )
streamFormat.mSampleRate = 44100.0; streamFormat.mSampleRate = 44100.0;
m_iSampleRate = int( streamFormat.mSampleRate ); m_iSampleRate = int( streamFormat.mSampleRate );
m_TimeScale = streamFormat.mSampleRate / AudioGetHostClockFrequency();
// Try to set the hardware sample rate. // Try to set the hardware sample rate.
{ {
@@ -184,8 +185,7 @@ RageSoundDriver_AU::~RageSoundDriver_AU()
int64_t RageSoundDriver_AU::GetPosition() const int64_t RageSoundDriver_AU::GetPosition() const
{ {
double scale = m_iSampleRate / AudioGetHostClockFrequency(); return int64_t( m_TimeScale * AudioGetCurrentHostTime() );
return int64_t( scale * AudioGetCurrentHostTime() );
} }
@@ -291,9 +291,8 @@ OSStatus RageSoundDriver_AU::Render( void *inRefCon,
This->m_pIOThread = new RageThreadRegister( "HAL I/O thread" ); This->m_pIOThread = new RageThreadRegister( "HAL I/O thread" );
AudioBuffer &buf = ioData->mBuffers[0]; AudioBuffer &buf = ioData->mBuffers[0];
double scale = This->m_iSampleRate / AudioGetHostClockFrequency(); int64_t now = int64_t( This->m_TimeScale * AudioGetCurrentHostTime() );
int64_t now = int64_t( scale * AudioGetCurrentHostTime() ); int64_t next = int64_t( This->m_TimeScale * inTimeStamp->mHostTime );
int64_t next = int64_t( scale * inTimeStamp->mHostTime );
This->Mix( (float *)buf.mData, inNumberFrames, next, now ); This->Mix( (float *)buf.mData, inNumberFrames, next, now );
if( unlikely(This->m_bDone) ) if( unlikely(This->m_bDone) )
stepmania/src/arch/Sound/RageSoundDriver_AU.h
+1
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@@ -27,6 +27,7 @@ private:
AudioBufferList *ioData ); AudioBufferList *ioData );
static void NameHALThread( CFRunLoopObserverRef, CFRunLoopActivity activity, void *inRefCon ); static void NameHALThread( CFRunLoopObserverRef, CFRunLoopActivity activity, void *inRefCon );
double m_TimeScale;
AudioUnit m_OutputUnit; AudioUnit m_OutputUnit;
int m_iSampleRate; int m_iSampleRate;
bool m_bDone; bool m_bDone;