peter1138@2743: /* $Id$ */
peter1138@2743: 
rubidium@9111: /** @file cocoa_s.cpp Sound driver for cocoa. */
rubidium@9111: 
peter1138@2953: /*****************************************************************************
peter1138@2953:  *                             Cocoa sound driver                            *
peter1138@2953:  * Known things left to do:                                                  *
peter1138@2953:  * - Might need to do endian checking for it to work on both ppc and x86     *
peter1138@2953:  *****************************************************************************/
bjarni@2736: 
bjarni@2736: #ifdef WITH_COCOA
bjarni@2736: 
egladil@7965: #define MAC_OS_X_VERSION_MIN_REQUIRED    MAC_OS_X_VERSION_10_3
egladil@7965: #include <AvailabilityMacros.h>
egladil@7965: 
bjarni@2736: #include <AudioUnit/AudioUnit.h>
bjarni@2736: 
bjarni@2736: /* Name conflict */
peter1138@2953: #define Rect        OTTDRect
peter1138@2953: #define Point       OTTDPoint
peter1138@2953: #define WindowClass OTTDWindowClass
bjarni@2736: 
bjarni@2736: #include "../stdafx.h"
bjarni@2736: #include "../debug.h"
bjarni@2736: #include "../driver.h"
bjarni@2736: #include "../mixer.h"
smatz@9543: #include "../core/endian_type.hpp"
bjarni@2736: 
bjarni@2736: #include "cocoa_s.h"
bjarni@2736: 
bjarni@2736: #undef WindowClass
bjarni@2736: #undef Point
bjarni@2736: #undef Rect
bjarni@2736: 
peter1138@7170: static FSoundDriver_Cocoa iFSoundDriver_Cocoa;
bjarni@2736: 
bjarni@2736: static AudioUnit _outputAudioUnit;
bjarni@2736: 
bjarni@2736: /* The CoreAudio callback */
egladil@7839: static OSStatus audioCallback(void *inRefCon, AudioUnitRenderActionFlags *inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData)
bjarni@2736: {
egladil@7839: 	MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);
bjarni@2736: 
bjarni@2736: 	return noErr;
bjarni@2736: }
bjarni@2736: 
bjarni@2736: 
peter1138@7170: const char *SoundDriver_Cocoa::Start(const char * const *parm)
bjarni@2736: {
bjarni@2736: 	Component comp;
bjarni@2736: 	ComponentDescription desc;
egladil@7839: 	struct AURenderCallbackStruct callback;
bjarni@2736: 	AudioStreamBasicDescription requestedDesc;
bjarni@2736: 
bjarni@2736: 	/* Setup a AudioStreamBasicDescription with the requested format */
bjarni@2736: 	requestedDesc.mFormatID = kAudioFormatLinearPCM;
bjarni@2736: 	requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
bjarni@2736: 	requestedDesc.mChannelsPerFrame = 2;
bjarni@2736: 	requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 11025);
bjarni@2736: 
bjarni@2736: 	requestedDesc.mBitsPerChannel = 16;
bjarni@2736: 	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
bjarni@2837: 
smatz@9543: #if TTD_ENDIAN == TTD_BIG_ENDIAN
bjarni@2736: 	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
smatz@9543: #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
bjarni@2736: 
bjarni@2736: 	requestedDesc.mFramesPerPacket = 1;
bjarni@2736: 	requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
bjarni@2736: 	requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
bjarni@2736: 
bjarni@2736: 
bjarni@2736: 	/* Locate the default output audio unit */
egladil@7839: 	desc.componentType = kAudioUnitType_Output;
egladil@7839: 	desc.componentSubType = kAudioUnitSubType_HALOutput;
egladil@7839: 	desc.componentManufacturer = kAudioUnitManufacturer_Apple;
bjarni@2736: 	desc.componentFlags = 0;
bjarni@2736: 	desc.componentFlagsMask = 0;
bjarni@2736: 
bjarni@2736: 	comp = FindNextComponent (NULL, &desc);
tron@4077: 	if (comp == NULL) {
bjarni@2736: 		return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
tron@4077: 	}
bjarni@2736: 
bjarni@2736: 	/* Open & initialize the default output audio unit */
tron@4077: 	if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {
bjarni@2736: 		return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
tron@4077: 	}
bjarni@2736: 
tron@4077: 	if (AudioUnitInitialize(_outputAudioUnit) != noErr) {
bjarni@2736: 		return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
tron@4077: 	}
bjarni@2736: 
bjarni@2736: 	/* Set the input format of the audio unit. */
tron@4077: 	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof(requestedDesc)) != noErr) {
peter1138@2953: 		return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";
tron@4077: 	}
bjarni@2736: 
bjarni@2736: 	/* Set the audio callback */
bjarni@2736: 	callback.inputProc = audioCallback;
bjarni@2736: 	callback.inputProcRefCon = NULL;
egladil@7839: 	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
egladil@7839: 		return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";
tron@4077: 	}
bjarni@2736: 
bjarni@2736: 	/* Finally, start processing of the audio unit */
tron@4077: 	if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {
bjarni@2736: 		return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";
tron@4077: 	}
bjarni@2736: 
bjarni@2736: 	/* We're running! */
bjarni@2736: 	return NULL;
bjarni@2736: }
bjarni@2736: 
bjarni@2736: 
peter1138@7170: void SoundDriver_Cocoa::Stop()
bjarni@2736: {
egladil@7839: 	struct AURenderCallbackStruct callback;
bjarni@2736: 
bjarni@2736: 	/* stop processing the audio unit */
tron@4077: 	if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {
rubidium@5383: 		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
bjarni@2736: 		return;
bjarni@2736: 	}
bjarni@2736: 
bjarni@2736: 	/* Remove the input callback */
bjarni@2736: 	callback.inputProc = 0;
bjarni@2736: 	callback.inputProcRefCon = 0;
egladil@7839: 	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
egladil@7839: 		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");
bjarni@2736: 		return;
bjarni@2736: 	}
bjarni@2736: 
bjarni@2736: 	if (CloseComponent(_outputAudioUnit) != noErr) {
rubidium@5383: 		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");
bjarni@2736: 		return;
bjarni@2736: 	}
bjarni@2736: }
bjarni@2736: 
bjarni@2736: #endif /* WITH_COCOA */