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/* $Id$ */

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/** @file cocoa_s.cpp Sound driver for cocoa. */

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/*****************************************************************************

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 *                             Cocoa sound driver                            *

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 * Known things left to do:                                                  *

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 * - Might need to do endian checking for it to work on both ppc and x86     *

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 *****************************************************************************/

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#ifdef WITH_COCOA

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#define MAC_OS_X_VERSION_MIN_REQUIRED    MAC_OS_X_VERSION_10_3

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#include <AvailabilityMacros.h>

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#include <AudioUnit/AudioUnit.h>

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/* Name conflict */

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#define Rect        OTTDRect

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#define Point       OTTDPoint

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#define WindowClass OTTDWindowClass

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#include "../stdafx.h"

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#include "../debug.h"

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#include "../driver.h"

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#include "../mixer.h"

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#include "../core/endian_func.hpp"

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#include "cocoa_s.h"

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#undef WindowClass

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#undef Point

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#undef Rect

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static FSoundDriver_Cocoa iFSoundDriver_Cocoa;

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static AudioUnit _outputAudioUnit;

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/* The CoreAudio callback */

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static OSStatus audioCallback(void *inRefCon, AudioUnitRenderActionFlags *inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData)

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{

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	MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);

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	return noErr;

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}

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const char *SoundDriver_Cocoa::Start(const char * const *parm)

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{

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	Component comp;

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	ComponentDescription desc;

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	struct AURenderCallbackStruct callback;

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	AudioStreamBasicDescription requestedDesc;

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	/* Setup a AudioStreamBasicDescription with the requested format */

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	requestedDesc.mFormatID = kAudioFormatLinearPCM;

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	requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;

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	requestedDesc.mChannelsPerFrame = 2;

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	requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 11025);

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	requestedDesc.mBitsPerChannel = 16;

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	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;

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#ifdef TTD_BIG_ENDIAN

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	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;

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#endif

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	requestedDesc.mFramesPerPacket = 1;

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	requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;

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	requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;

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	/* Locate the default output audio unit */

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	desc.componentType = kAudioUnitType_Output;

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	desc.componentSubType = kAudioUnitSubType_HALOutput;

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	desc.componentManufacturer = kAudioUnitManufacturer_Apple;

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	desc.componentFlags = 0;

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	desc.componentFlagsMask = 0;

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	comp = FindNextComponent (NULL, &desc);

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	if (comp == NULL) {

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		return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";

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	}

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	/* Open & initialize the default output audio unit */

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	if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {

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		return "cocoa_s: Failed to start CoreAudio: OpenAComponent";

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	}

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	if (AudioUnitInitialize(_outputAudioUnit) != noErr) {

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		return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";

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	}

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	/* Set the input format of the audio unit. */

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	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof(requestedDesc)) != noErr) {

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		return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";

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	}

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	/* Set the audio callback */

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	callback.inputProc = audioCallback;

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	callback.inputProcRefCon = NULL;

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	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {

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		return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";

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	}

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	/* Finally, start processing of the audio unit */

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	if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {

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		return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";

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	}

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	/* We're running! */

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	return NULL;

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}

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void SoundDriver_Cocoa::Stop()

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{

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	struct AURenderCallbackStruct callback;

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	/* stop processing the audio unit */

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	if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {

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		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");

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		return;

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	}

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	/* Remove the input callback */

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	callback.inputProc = 0;

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	callback.inputProcRefCon = 0;

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	if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {

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		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");

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		return;

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	}

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	if (CloseComponent(_outputAudioUnit) != noErr) {

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		DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");

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		return;

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	}

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}

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#endif /* WITH_COCOA */