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/* $Id$ */
/******************************************************************************************
* Cocoa sound driver *
* Known things left to do: *
* - Might need to do endian checking for it to work on both ppc and x86 *
******************************************************************************************/
#ifdef WITH_COCOA
#include <AudioUnit/AudioUnit.h>
/* Name conflict */
#define Rect OTTDRect
#define Point OTTDPoint
#define WindowClass OTTDWindowClass
/* Defined in stdbool.h */
#ifndef __cplusplus
# ifndef __BEOS__
# undef bool
# undef false
# undef true
# endif
#endif
#include "../stdafx.h"
#include "../openttd.h"
#include "../debug.h"
#include "../driver.h"
#include "../mixer.h"
#include "../sdl.h"
#include "cocoa_s.h"
#undef WindowClass
#undef Point
#undef Rect
static AudioUnit _outputAudioUnit;
/* The CoreAudio callback */
static OSStatus audioCallback (void *inRefCon, AudioUnitRenderActionFlags inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, AudioBuffer *ioData)
{
MxMixSamples(_mixer, ioData->mData, ioData->mDataByteSize / 4);
return noErr;
}
static const char *CocoaSoundStart(const char * const *parm)
{
Component comp;
ComponentDescription desc;
struct AudioUnitInputCallback callback;
AudioStreamBasicDescription requestedDesc;
DEBUG(driver, 1)("cocoa_s: CocoaSoundStart");
/* Setup a AudioStreamBasicDescription with the requested format */
requestedDesc.mFormatID = kAudioFormatLinearPCM;
requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
requestedDesc.mChannelsPerFrame = 2;
requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 11025);
requestedDesc.mBitsPerChannel = 16;
requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
#if 1 // Big endian?
requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
#endif
requestedDesc.mFramesPerPacket = 1;
requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
/* Locate the default output audio unit */
desc.componentType = kAudioUnitComponentType;
desc.componentSubType = kAudioUnitSubType_Output;
desc.componentManufacturer = kAudioUnitID_DefaultOutput;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
comp = FindNextComponent (NULL, &desc);
if (comp == NULL)
return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
/* Open & initialize the default output audio unit */
if(OpenAComponent(comp, &_outputAudioUnit) != noErr)
return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
if(AudioUnitInitialize(_outputAudioUnit) != noErr)
return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
/* Set the input format of the audio unit. */
if(AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof (requestedDesc)) != noErr)
return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";
/* Set the audio callback */
callback.inputProc = audioCallback;
callback.inputProcRefCon = NULL;
if(AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetInputCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr)
return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)";
/* Finally, start processing of the audio unit */
if(AudioOutputUnitStart (_outputAudioUnit) != noErr)
return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";
/* We're running! */
return NULL;
}
static void CocoaSoundStop(void)
{
struct AudioUnitInputCallback callback;
DEBUG(driver, 1)("cocoa_s: CocoaSoundStop");
/* stop processing the audio unit */
if(AudioOutputUnitStop(_outputAudioUnit) != noErr) {
DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
return;
}
/* Remove the input callback */
callback.inputProc = 0;
callback.inputProcRefCon = 0;
if(AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetInputCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback) failed");
return;
}
if (CloseComponent(_outputAudioUnit) != noErr) {
DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: CloseComponent failed");
return;
}
}
const HalSoundDriver _cocoa_sound_driver = {
CocoaSoundStart,
CocoaSoundStop,
};
#endif /* WITH_COCOA */
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