fix potential memory leak

increase decoder thread priority
init the hardware stream in the driver, not in the converter

stepmania/src/arch/Sound/CAHelpers.cpp

@@ -2,48 +2,24 @@
 #include "RageSoundDriver_CA.h"
 #include "CAHelpers.h"
 
-#include "CAAudioHardwareDevice.h"
+const UInt32 kFramesPerPacket = 1;
-#include "CAAudioHardwareStream.h"
+const UInt32 kChannelsPerFrame = 2;
-#include "CAException.h"
+const UInt32 kBitsPerChannel = 16;
+const UInt32 kBytesPerPacket = kChannelsPerFrame * kBitsPerChannel / 8;
+const UInt32 kBytesPerFrame = kBytesPerPacket;
+const UInt32 kFormatFlags = kAudioFormatFlagsNativeEndian |
+                            kAudioFormatFlagIsSignedInteger;
 
-AudioConverter::AudioConverter(CAAudioHardwareDevice *dev, RageSound_CA *driver)
+AudioConverter::AudioConverter( RageSound_CA *driver, const Desc &procFormat )
     : mBuffer(NULL), mBufferSize(0)
 {
-    AudioStreamID sID = dev->GetStreamByIndex(kAudioDeviceSectionOutput, 0);
-    CAAudioHardwareStream stream(sID);
-    vector<Desc> procFormats;
-    vector<Desc> physicalFormats;
-    UInt32 numFormats = stream.GetNumberAvailableIOProcFormats();
-    
-    for (UInt32 i=0; i<numFormats; ++i)
-    {
-        Desc desc;
-        
-        stream.GetAvailableIOProcFormatByIndex(i, desc);
-        procFormats.push_back(desc);
-    }
-    
-    const Desc& procFormat = FindClosestFormat(procFormats);
-    stream.SetCurrentIOProcFormat(procFormat);
-    
-    numFormats = stream.GetNumberAvailablePhysicalFormats();
-    for (UInt32 i=0; i<numFormats; ++i)
-    {
-        Desc desc;
-        
-        stream.GetAvailablePhysicalFormatByIndex(i, desc);
-        physicalFormats.push_back(desc);
-    }
-    
-    const Desc& physicalFormat = FindClosestFormat(physicalFormats);
-    stream.SetCurrentPhysicalFormat(physicalFormat);
-    
     const Desc SMFormat(44100.0, kAudioFormatLinearPCM, kBytesPerPacket,
                         kFramesPerPacket, kBytesPerFrame, kChannelsPerFrame,
                         kBitsPerChannel, kFormatFlags);
     
     SMFormat.Print();
     procFormat.Print();
+
     if( this->Initialize(SMFormat, procFormat) )
         RageException::ThrowNonfatal( "Couldn't create the converter." );
     
@@ -59,7 +35,7 @@ OSStatus AudioConverter::FormatConverterInputProc(UInt32& ioNumberDataPackets,
     // This really shouldn't happen more than once, but better be sure.
     if( mBufferSize != buf.mDataByteSize )
     {
-        delete mBuffer; // deleting NULL does not crash, unlike free(NULL)
+        delete mBuffer;
         mBufferSize = buf.mDataByteSize;
         mBuffer = new UInt8[mBufferSize];
     }
@@ -69,36 +45,3 @@ OSStatus AudioConverter::FormatConverterInputProc(UInt32& ioNumberDataPackets,
     return noErr;
 }
 
-Desc AudioConverter::FindClosestFormat(const vector<Desc>& formats)
-{
-    vector<Desc> v;
-    
-    vector<Desc>::const_iterator i;
-    for (i = formats.begin(); i != formats.end(); ++i)
-    {
-        const Desc& format = *i;
-        
-        if (!format.IsPCM() || format.mSampleRate != 44100.0)
-            continue;
-        
-        if (format.SampleWordSize() == 2 &&
-            (format.mFormatFlags & kAudioFormatFlagIsSignedInteger) ==
-            kAudioFormatFlagIsSignedInteger)
-        { // exact match
-            return format;
-        }
-        v.push_back(format);
-    }
-    
-    for (i = v.begin(); i != v.end(); ++i)
-    {
-        const Desc& format = *i;
-        if (format.SampleWordSize() == 2)
-        {
-            return format; // close
-        }
-    }
-    if (v.empty())
-        RageException::ThrowNonfatal("Couldn't find a close format.");
-    return v[0]; // something is better than nothing.
-}

stepmania/src/arch/Sound/CAHelpers.h

@@ -1,24 +1,16 @@
 #ifndef CA_HELPERS_H
 #define CA_HELPERS_H
 
-#include <vector>
 #include "FormatConverterClient.h"
 #include "CAStreamBasicDescription.h"
 
-const UInt32 kFramesPerPacket = 1;
-const UInt32 kChannelsPerFrame = 2;
-const UInt32 kBitsPerChannel = 16;
-const UInt32 kBytesPerPacket = kChannelsPerFrame * kBitsPerChannel / 8;
-const UInt32 kBytesPerFrame = kBytesPerPacket;
-const UInt32 kFormatFlags = kAudioFormatFlagsNativeEndian |
-                            kAudioFormatFlagIsSignedInteger;
 typedef CAStreamBasicDescription Desc;
 
 
 class AudioConverter : public FormatConverterClient
 {
 public:
-    AudioConverter(CAAudioHardwareDevice *dev, RageSound_CA *driver);
+    AudioConverter( RageSound_CA *driver, const Desc &procFormat );
     ~AudioConverter() { delete mBuffer; }
 protected:
     OSStatus FormatConverterInputProc(UInt32& ioNumberDataPackets,

stepmania/src/arch/Sound/RageSoundDriver_CA.cpp

@@ -4,16 +4,78 @@
 
 #include "CAAudioHardwareSystem.h"
 #include "CAAudioHardwareDevice.h"
+#include "CAAudioHardwareStream.h"
 #include "CAStreamBasicDescription.h"
 #include "CAException.h"
 #include "archutils/Unix/CrashHandler.h"
-
+#include <mach/thread_act.h>
+#include <mach/mach_init.h>
 
 namespace
 {
     AudioConverter *gConverter;
 }
 
+
+static Desc FindClosestFormat(const vector<Desc>& formats)
+{
+	vector<Desc> v;
+
+	vector<Desc>::const_iterator i;
+	for (i = formats.begin(); i != formats.end(); ++i)
+	{
+		const Desc& format = *i;
+
+		if (!format.IsPCM() || format.mSampleRate != 44100.0)
+			continue;
+
+		if (format.SampleWordSize() == 2 &&
+				(format.mFormatFlags & kAudioFormatFlagIsSignedInteger) ==
+				kAudioFormatFlagIsSignedInteger)
+		{ // exact match
+			return format;
+		}
+		v.push_back(format);
+	}
+
+	for (i = v.begin(); i != v.end(); ++i)
+	{
+		const Desc& format = *i;
+		if (format.SampleWordSize() == 2)
+		{
+			return format; // close
+		}
+	}
+	if (v.empty())
+		RageException::ThrowNonfatal("Couldn't find a close format.");
+	return v[0]; // something is better than nothing.
+}
+
+static void GetIOProcFormats( CAAudioHardwareStream stream, vector<Desc> &procFormats )
+{
+	UInt32 numFormats = stream.GetNumberAvailableIOProcFormats();
+
+	for( UInt32 i=0; i<numFormats; ++i )
+	{
+		Desc desc;
+
+		stream.GetAvailableIOProcFormatByIndex( i, desc );
+		procFormats.push_back( desc );
+	}
+}
+
+static void GetPhysicalFormats( CAAudioHardwareStream stream, vector<Desc> &physicalFormats )
+{
+	UInt32 numFormats = stream.GetNumberAvailablePhysicalFormats();
+	for( UInt32 i=0; i<numFormats; ++i )
+	{
+		Desc desc;
+
+		stream.GetAvailablePhysicalFormatByIndex( i, desc );
+		physicalFormats.push_back( desc );
+	}
+}
+
 RageSound_CA::RageSound_CA()
 {
     try
@@ -36,7 +98,22 @@ RageSound_CA::RageSound_CA()
         RageException::ThrowNonfatal("Couldn't get Latency.");
     }
     
-    gConverter = new AudioConverter(mOutputDevice, this);
+    AudioStreamID sID = mOutputDevice->GetStreamByIndex( kAudioDeviceSectionOutput, 0 );
+    CAAudioHardwareStream stream( sID );
+
+    vector<Desc> procFormats;
+    GetIOProcFormats( sID, procFormats );
+
+    vector<Desc> physicalFormats;
+    GetPhysicalFormats( sID, physicalFormats );
+
+    const Desc& procFormat = FindClosestFormat( procFormats );
+    stream.SetCurrentIOProcFormat( procFormat );
+
+    const Desc& physicalFormat = FindClosestFormat( physicalFormats );
+    stream.SetCurrentPhysicalFormat( physicalFormat );
+
+    gConverter = new AudioConverter( this, procFormat );
     
     try
     {
@@ -45,6 +122,7 @@ RageSound_CA::RageSound_CA()
     }
     catch(const CAException& e)
     {
+	delete gConverter;
         RageException::Throw("Couldn't start the IOProc.");
     }
 }
@@ -87,3 +165,12 @@ OSStatus RageSound_CA::GetData(AudioDeviceID inDevice,
     gConverter->FillComplexBuffer(dataPackets, *outOutputData, NULL);
     return noErr;
 }
+
+void RageSound_CA::SetupDecodingThread()
+{
+	/* Increase the scheduling precedence of the decoder thread. */
+	thread_precedence_policy po;
+	po.importance = 5;
+	thread_policy_set( mach_thread_self(), THREAD_PRECEDENCE_POLICY, (int *)&po, THREAD_PRECEDENCE_POLICY_COUNT );
+}
+

stepmania/src/arch/Sound/RageSoundDriver_CA.h

@@ -32,7 +32,7 @@ public:
     ~RageSound_CA();
     float GetPlayLatency() const { return mLatency; }
     int64_t GetPosition(const RageSoundBase *sound) const;
-    //void VolumeChanged();
+    void SetupDecodingThread();
 };
 
 #define RAGE_SOUND_CA