src/sound/cocoa_s.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file cocoa_s.cpp Sound driver for cocoa. */
   9
  10 /*****************************************************************************
  11  *                             Cocoa sound driver                            *
  12  * Known things left to do:                                                  *
  13  * - Might need to do endian checking for it to work on both ppc and x86     *
  14  *****************************************************************************/
  15
  16 #ifdef WITH_COCOA
  17
  18 #include "../stdafx.h"
  19 #include "../os/macosx/macos.h"
  20 #include "../debug.h"
  21 #include "../driver.h"
  22 #include "../mixer.h"
  23 #include "../core/endian_type.hpp"
  24 #include "cocoa_s.h"
  25
  26 #define Rect        OTTDRect
  27 #define Point       OTTDPoint
  28 #include <AudioUnit/AudioUnit.h>
  29 #undef Rect
  30 #undef Point
  31
  32 #include "../safeguards.h"
  33
  34 static FSoundDriver_Cocoa iFSoundDriver_Cocoa;
  35
  36 static AudioUnit _outputAudioUnit;
  37
  38 /* The CoreAudio callback */
  39 static OSStatus audioCallback(void *, AudioUnitRenderActionFlags *, const AudioTimeStamp *, UInt32, UInt32, AudioBufferList *ioData)
  40 {
  41         MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);
  42
  43         return noErr;
  44 }
  45
  46
  47 const char *SoundDriver_Cocoa::Start(const StringList &parm)
  48 {
  49         struct AURenderCallbackStruct callback;
  50         AudioStreamBasicDescription requestedDesc;
  51
  52         /* Setup a AudioStreamBasicDescription with the requested format */
  53         requestedDesc.mFormatID = kAudioFormatLinearPCM;
  54         requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
  55         requestedDesc.mChannelsPerFrame = 2;
  56         requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 44100);
  57
  58         requestedDesc.mBitsPerChannel = 16;
  59         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
  60
  61 #if TTD_ENDIAN == TTD_BIG_ENDIAN
  62         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
  63 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
  64
  65         requestedDesc.mFramesPerPacket = 1;
  66         requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
  67         requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
  68
  69         MxInitialize((uint)requestedDesc.mSampleRate);
  70
  71         /* Locate the default output audio unit */
  72         AudioComponentDescription desc;
  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         AudioComponent comp = AudioComponentFindNext (nullptr, &desc);
  80         if (comp == nullptr) {
  81                 return "cocoa_s: Failed to start CoreAudio: AudioComponentFindNext returned nullptr";
  82         }
  83
  84         /* Open & initialize the default output audio unit */
  85         if (AudioComponentInstanceNew(comp, &_outputAudioUnit) != noErr) {
  86                 return "cocoa_s: Failed to start CoreAudio: AudioComponentInstanceNew";
  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 = nullptr;
 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 nullptr;
 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 (AudioComponentInstanceDispose(_outputAudioUnit) != noErr) {
 134                 Debug(driver, 0, "cocoa_s: Core_CloseAudio: AudioComponentInstanceDispose failed");
 135                 return;
 136         }
 137 }
 138
 139 #endif /* WITH_COCOA */