1

/* $Id$ */

     2

     3

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

     4

 *                             Cocoa sound driver                            *

     5

 * Known things left to do:                                                  *

     6

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

     7

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

     8

     9

#ifdef WITH_COCOA

    10

    11

#define MAC_OS_X_VERSION_MIN_REQUIRED    MAC_OS_X_VERSION_10_3

    12

#include <AvailabilityMacros.h>

    13

    14

#include <AudioUnit/AudioUnit.h>

    15

    16

/* Name conflict */

    17

#define Rect        OTTDRect

    18

#define Point       OTTDPoint

    19

#define WindowClass OTTDWindowClass

    20

    21

#include "../stdafx.h"

    22

#include "../debug.h"

    23

#include "../driver.h"

    24

#include "../mixer.h"

    26

    27

#include "cocoa_s.h"

    28

    29

#undef WindowClass

    30

#undef Point

    31

#undef Rect

    32

    33

static FSoundDriver_Cocoa iFSoundDriver_Cocoa;

    34

    35

static AudioUnit _outputAudioUnit;

    36

    37

/* The CoreAudio callback */

    38

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

    39

{

    40

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

    41

    42

	return noErr;

    43

}

    44

    45

    46

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

    47

{

    48

	Component comp;

    49

	ComponentDescription desc;

    50

	struct AURenderCallbackStruct callback;

    51

	AudioStreamBasicDescription requestedDesc;

    52

    53

	/* Setup a AudioStreamBasicDescription with the requested format */

    54

	requestedDesc.mFormatID = kAudioFormatLinearPCM;

    55

	requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;

    56

	requestedDesc.mChannelsPerFrame = 2;

    57

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

    58

    59

	requestedDesc.mBitsPerChannel = 16;

    60

	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;

    61

    62

#ifdef TTD_BIG_ENDIAN

    63

	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;

    64

#endif

    65

    66

	requestedDesc.mFramesPerPacket = 1;

    67

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

    68

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

    69

    70

    71

	/* Locate the default output audio unit */

    72

	desc.componentType = kAudioUnitType_Output;

    73

	desc.componentSubType = kAudioUnitSubType_HALOutput;

    74

	desc.componentManufacturer = kAudioUnitManufacturer_Apple;

    75

	desc.componentFlags = 0;

    76

	desc.componentFlagsMask = 0;

    77

    78

	comp = FindNextComponent (NULL, &desc);

    79

	if (comp == NULL) {

    80

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

    81

	}

    82

    83

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

    84

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

    85

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

    86

	}

    87

    88

	if (AudioUnitInitialize(_outputAudioUnit) != noErr) {

    89

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

    90

	}

    91

    92

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

    93

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

    94

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

    95

	}

    96

    97

	/* Set the audio callback */

    98

	callback.inputProc = audioCallback;

    99

	callback.inputProcRefCon = NULL;

   100

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

   101

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

   102

	}

   103

   104

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

   105

	if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {

   106

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

   107

	}

   108

   109

	/* We're running! */

   110

	return NULL;

   111

}

   112

   113

   114

void SoundDriver_Cocoa::Stop()

   115

{

   116

	struct AURenderCallbackStruct callback;

   117

   118

	/* stop processing the audio unit */

   119

	if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {

   120

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

   121

		return;

   122

	}

   123

   124

	/* Remove the input callback */

   125

	callback.inputProc = 0;

   126

	callback.inputProcRefCon = 0;

   127

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

   128

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

   129

		return;

   130

	}

   131

   132

	if (CloseComponent(_outputAudioUnit) != noErr) {

   133

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

   134

		return;

   135

	}

   136

}

   137

   138

#endif /* WITH_COCOA */