src/sound/cocoa_s.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file cocoa_s.cpp Sound driver for cocoa. */
  11
  12 /*****************************************************************************
  13  *                             Cocoa sound driver                            *
  14  * Known things left to do:                                                  *
  15  * - Might need to do endian checking for it to work on both ppc and x86     *
  16  *****************************************************************************/
  17
  18 #ifdef WITH_COCOA
  19
  20 #include "../stdafx.h"
  21 #include "../debug.h"
  22 #include "../driver.h"
  23 #include "../mixer.h"
  24 #include "../core/endian_type.hpp"
  25 #include "cocoa_s.h"
  26
  27 #define Rect        OTTDRect
  28 #define Point       OTTDPoint
  29 #include <AudioUnit/AudioUnit.h>
  30 #undef Rect
  31 #undef Point
  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", 44100);
  58
  59         requestedDesc.mBitsPerChannel = 16;
  60         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
  61
  62 #if TTD_ENDIAN == TTD_BIG_ENDIAN
  63         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
  64 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
  65
  66         requestedDesc.mFramesPerPacket = 1;
  67         requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
  68         requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
  69
  70         MxInitialize((uint)requestedDesc.mSampleRate);
  71
  72         /* Locate the default output audio unit */
  73         desc.componentType = kAudioUnitType_Output;
  74         desc.componentSubType = kAudioUnitSubType_HALOutput;
  75         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
  76         desc.componentFlags = 0;
  77         desc.componentFlagsMask = 0;
  78
  79         comp = FindNextComponent (NULL, &desc);
  80         if (comp == NULL) {
  81                 return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
  82         }
  83
  84         /* Open & initialize the default output audio unit */
  85         if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {
  86                 return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
  87         }
  88
  89         if (AudioUnitInitialize(_outputAudioUnit) != noErr) {
  90                 return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
  91         }
  92
  93         /* Set the input format of the audio unit. */
  94         if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &requestedDesc, sizeof(requestedDesc)) != noErr) {
  95                 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)";
  96         }
  97
  98         /* Set the audio callback */
  99         callback.inputProc = audioCallback;
 100         callback.inputProcRefCon = NULL;
 101         if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
 102                 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";
 103         }
 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
 110         /* We're running! */
 111         return NULL;
 112 }
 113
 114
 115 void SoundDriver_Cocoa::Stop()
 116 {
 117         struct AURenderCallbackStruct callback;
 118
 119         /* stop processing the audio unit */
 120         if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {
 121                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
 122                 return;
 123         }
 124
 125         /* Remove the input callback */
 126         callback.inputProc = 0;
 127         callback.inputProcRefCon = 0;
 128         if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
 129                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");
 130                 return;
 131         }
 132
 133         if (CloseComponent(_outputAudioUnit) != noErr) {
 134                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");
 135                 return;
 136         }
 137 }
 138
 139 #endif /* WITH_COCOA */