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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "CoreAudioSoundStream.h"
typedef struct internal
{
AudioUnit audioUnit;
short realtimeBuffer[1024 * 1024];
};
OSStatus callback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) {
internal *soundStruct = (internal *)inRefCon;
for (int i=0; i < (int)ioData->mNumberBuffers; i++)
{
memcpy(ioData->mBuffers[i].mData, &soundStruct->realtimeBuffer, ioData->mBuffers[i].mDataByteSize);
}
return 0;
}
void CoreAudioSound::SoundLoop()
{
CoreAudioInit();
}
CoreAudioSound::CoreAudioSound(CMixer *mixer) : SoundStream(mixer)
{
}
CoreAudioSound::~CoreAudioSound()
{
}
bool CoreAudioSound::CoreAudioInit()
{
ComponentDescription desc;
OSStatus err;
UInt32 enableIO;
AURenderCallbackStruct callback_struct;
AudioStreamBasicDescription format;
UInt32 numBytesToRender = 512;
internal *soundStruct = (internal *)malloc(sizeof(internal));
memset(soundStruct->realtimeBuffer, 0, sizeof(soundStruct->realtimeBuffer));
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_HALOutput;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
Component component = FindNextComponent(NULL, &desc);
if (component == NULL)
printf("error finding component\n");
err = OpenAComponent(component, &soundStruct->audioUnit);
if (err)
printf("error opening audio component\n");
//enable output device
enableIO = 1;
AudioUnitSetProperty(soundStruct->audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
0,
&enableIO,
sizeof(enableIO));
format.mBitsPerChannel = 16;
format.mChannelsPerFrame = 2;
format.mBytesPerPacket = 4;
format.mBytesPerFrame = 4;
format.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
format.mFormatID = kAudioFormatLinearPCM;
format.mFramesPerPacket = 1;
format.mSampleRate = m_mixer->GetSampleRate();
//set format to output scope
err = AudioUnitSetProperty(soundStruct->audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &format, sizeof(AudioStreamBasicDescription));
if (err)
printf("error when setting output format\n");
callback_struct.inputProc = callback;
callback_struct.inputProcRefCon = soundStruct;
err = AudioUnitSetProperty(soundStruct->audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, 0, &callback_struct, sizeof(callback_struct));
if (err)
printf("error when setting input callback\n");
err = AudioUnitInitialize(soundStruct->audioUnit);
if (err)
printf("error when initiaising audiounit\n");
err = AudioOutputUnitStart(soundStruct->audioUnit);
if (err)
printf("error when starting audiounit\n");
do
{
soundCriticalSection.Enter();
m_mixer->Mix(soundStruct->realtimeBuffer, numBytesToRender);
soundCriticalSection.Leave();
soundSyncEvent.Wait();
}while(!threadData);
err = AudioOutputUnitStop(soundStruct->audioUnit);
if(err)
printf("error when sopping audiounit\n");
err = AudioUnitUninitialize(soundStruct->audioUnit);
if(err)
printf("Error uninitializing audiounit\n");
err = CloseComponent(soundStruct->audioUnit);
if(err)
printf("Error while closing component\n");
free(soundStruct);
return true;
}
void *coreAudioThread(void *args)
{
((CoreAudioSound *)args)->SoundLoop();
return NULL;
}
bool CoreAudioSound::Start()
{
soundSyncEvent.Init();
thread = new Common::Thread(coreAudioThread, (void *)this);
return true;
}
void CoreAudioSound::Stop()
{
threadData = 1;
soundSyncEvent.Set();
delete thread;
thread = NULL;
return;
}
void CoreAudioSound::Update()
{
soundSyncEvent.Set();
}
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