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
00073
00074 desc.componentType = kAudioUnitType_Output;
00075 desc.componentSubType = kAudioUnitSubType_HALOutput;
00076 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
00077 desc.componentFlags = 0;
00078 desc.componentFlagsMask = 0;
00079
00080 comp = FindNextComponent (NULL, &desc);
00081 if (comp == NULL) {
00082 return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
00083 }
00084
00085
00086 if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {
00087 return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
00088 }
00089
00090 if (AudioUnitInitialize(_outputAudioUnit) != noErr) {
00091 return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
00092 }
00093
00094
00095 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof(requestedDesc)) != noErr) {
00096 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";
00097 }
00098
00099
00100 callback.inputProc = audioCallback;
00101 callback.inputProcRefCon = NULL;
00102 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
00103 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";
00104 }
00105
00106
00107 if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {
00108 return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";
00109 }
00110
00111
00112 return NULL;
00113 }
00114
00115
00116 void SoundDriver_Cocoa::Stop()
00117 {
00118 struct AURenderCallbackStruct callback;
00119
00120
00121 if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {
00122 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
00123 return;
00124 }
00125
00126
00127 callback.inputProc = 0;
00128 callback.inputProcRefCon = 0;
00129 if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
00130 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");
00131 return;
00132 }
00133
00134 if (CloseComponent(_outputAudioUnit) != noErr) {
00135 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");
00136 return;
00137 }
00138 }
00139
00140 #endif