cocoa_s.cpp
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00011 #ifdef WITH_COCOA
00012
00013 #define MAC_OS_X_VERSION_MIN_REQUIRED MAC_OS_X_VERSION_10_3
00014 #include <AvailabilityMacros.h>
00015
00016 #include <AudioUnit/AudioUnit.h>
00017
00018
00019 #define Rect OTTDRect
00020 #define Point OTTDPoint
00021 #define WindowClass OTTDWindowClass
00022
00023 #include "../stdafx.h"
00024 #include "../debug.h"
00025 #include "../driver.h"
00026 #include "../mixer.h"
00027 #include "../core/endian_type.hpp"
00028
00029 #include "cocoa_s.h"
00030
00031 #undef WindowClass
00032 #undef Point
00033 #undef Rect
00034
00035 static FSoundDriver_Cocoa iFSoundDriver_Cocoa;
00036
00037 static AudioUnit _outputAudioUnit;
00038
00039
00040 static OSStatus audioCallback(void *inRefCon, AudioUnitRenderActionFlags *inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData)
00041 {
00042 MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);
00043
00044 return noErr;
00045 }
00046
00047
00048 const char *SoundDriver_Cocoa::Start(const char * const *parm)
00049 {
00050 Component comp;
00051 ComponentDescription desc;
00052 struct AURenderCallbackStruct callback;
00053 AudioStreamBasicDescription requestedDesc;
00054
00055
00056 requestedDesc.mFormatID = kAudioFormatLinearPCM;
00057 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
00058 requestedDesc.mChannelsPerFrame = 2;
00059 requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 11025);
00060
00061 requestedDesc.mBitsPerChannel = 16;
00062 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
00063
00064 #if TTD_ENDIAN == TTD_BIG_ENDIAN
00065 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
00066 #endif
00067
00068 requestedDesc.mFramesPerPacket = 1;
00069 requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
00070 requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
00071
00072 MxInitialize(requestedDesc.mSampleRate);
00073
00074
00075 desc.componentType = kAudioUnitType_Output;
00076 desc.componentSubType = kAudioUnitSubType_HALOutput;
00077 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
00078 desc.componentFlags = 0;
00079 desc.componentFlagsMask = 0;
00080
00081 comp = FindNextComponent (NULL, &desc);
00082 if (comp == NULL) {
00083 return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
00084 }
00085
00086
00087 if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {
00088 return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
00089 }
00090
00091 if (AudioUnitInitialize(_outputAudioUnit) != noErr) {
00092 return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
00093 }
00094
00095
00096 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof(requestedDesc)) != noErr) {
00097 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";
00098 }
00099
00100
00101 callback.inputProc = audioCallback;
00102 callback.inputProcRefCon = NULL;
00103 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
00104 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";
00105 }
00106
00107
00108 if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {
00109 return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";
00110 }
00111
00112
00113 return NULL;
00114 }
00115
00116
00117 void SoundDriver_Cocoa::Stop()
00118 {
00119 struct AURenderCallbackStruct callback;
00120
00121
00122 if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {
00123 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
00124 return;
00125 }
00126
00127
00128 callback.inputProc = 0;
00129 callback.inputProcRefCon = 0;
00130 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
00131 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");
00132 return;
00133 }
00134
00135 if (CloseComponent(_outputAudioUnit) != noErr) {
00136 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");
00137 return;
00138 }
00139 }
00140
00141 #endif