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

#include <AudioUnit/AudioUnit.h>

    12

    13

/* Name conflict */

    14

#define Rect		OTTDRect

    15

#define Point		OTTDPoint

    16

#define WindowClass	OTTDWindowClass

    17

/* Defined in stdbool.h */

    18

#ifndef __cplusplus

    19

# ifndef __BEOS__

    20

#  undef bool

    21

#  undef false

    22

#  undef true

    23

# endif

    24

#endif

    25

    26

#include "../stdafx.h"

    27

#include "../openttd.h"

    28

#include "../debug.h"

    29

#include "../driver.h"

    30

#include "../mixer.h"

    31

#include "../sdl.h"

    32

    33

#include "cocoa_s.h"

    34

    35

#undef WindowClass

    36

#undef Point

    37

#undef Rect

    38

    39

    40

static AudioUnit _outputAudioUnit;

    41

    42

/* The CoreAudio callback */

    43

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

    44

{

    45

	MxMixSamples(_mixer, ioData->mData, ioData->mDataByteSize / 4);

    46

    47

	return noErr;

    48

}

    49

    50

    51

static const char *CocoaSoundStart(const char * const *parm)

    52

{

    53

	Component comp;

    54

	ComponentDescription desc;

    55

	struct AudioUnitInputCallback callback;

    56

	AudioStreamBasicDescription requestedDesc;

    57

    58

	DEBUG(driver, 1)("cocoa_s: CocoaSoundStart");

    59

    60

	/* Setup a AudioStreamBasicDescription with the requested format */

    61

	requestedDesc.mFormatID = kAudioFormatLinearPCM;

    62

	requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;

    63

	requestedDesc.mChannelsPerFrame = 2;

    64

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

    65

    66

	requestedDesc.mBitsPerChannel = 16;

    67

	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;

    68

#if 1		// Big endian?

    69

	requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;

    70

#endif

    71

    72

	requestedDesc.mFramesPerPacket = 1;

    73

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

    74

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

    75

    76

    77

	/* Locate the default output audio unit */

    78

	desc.componentType = kAudioUnitComponentType;

    79

	desc.componentSubType = kAudioUnitSubType_Output;

    80

	desc.componentManufacturer = kAudioUnitID_DefaultOutput;

    81

	desc.componentFlags = 0;

    82

	desc.componentFlagsMask = 0;

    83

    84

	comp = FindNextComponent (NULL, &desc);

    85

	if (comp == NULL)

    86

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

    87

    88

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

    89

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

    90

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

    91

    92

	if(AudioUnitInitialize(_outputAudioUnit) != noErr)

    93

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

    94

    95

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

    96

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

    97

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

    98

    99

	/* Set the audio callback */

   100

	callback.inputProc = audioCallback;

   101

	callback.inputProcRefCon = NULL;

   102

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

   103

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

   104

   105

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

   106

	if(AudioOutputUnitStart (_outputAudioUnit) != noErr)

   107

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

   108

   109

	/* We're running! */

   110

	return NULL;

   111

}

   112

   113

   114

static void CocoaSoundStop(void)

   115

{

   116

	struct AudioUnitInputCallback callback;

   117

   118

	DEBUG(driver, 1)("cocoa_s: CocoaSoundStop");

   119

   120

	/* stop processing the audio unit */

   121

	if(AudioOutputUnitStop(_outputAudioUnit) != noErr) {

   122

		DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");

   123

		return;

   124

	}

   125

   126

	/* Remove the input callback */

   127

	callback.inputProc = 0;

   128

	callback.inputProcRefCon = 0;

   129

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

   130

		DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback) failed");

   131

		return;

   132

	}

   133

   134

	if (CloseComponent(_outputAudioUnit) != noErr) {

   135

		DEBUG(driver, 1)("cocoa_s: Core_CloseAudio: CloseComponent failed");

   136

		return;

   137

	}

   138

}

   139

   140

   141

const HalSoundDriver _cocoa_sound_driver = {

   142

	CocoaSoundStart,

   143

	CocoaSoundStop,

   144

};

   145

   146

#endif /* WITH_COCOA */