src/sound/cocoa_s.cpp

   1 /* $Id: cocoa_s.cpp 25714 2013-08-10 12:47:24Z fonsinchen $ */
   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 #include "../safeguards.h"
  34
  35 static FSoundDriver_Cocoa iFSoundDriver_Cocoa;
  36
  37 static AudioUnit _outputAudioUnit;
  38
  39 /* The CoreAudio callback */
  40 static OSStatus audioCallback(void *inRefCon, AudioUnitRenderActionFlags *inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData)
  41 {
  42         MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);
  43
  44         return noErr;
  45 }
  46
  47
  48 const char *SoundDriver_Cocoa::Start(const char * const *parm)
  49 {
  50         Component comp;
  51         ComponentDescription desc;
  52         struct AURenderCallbackStruct callback;
  53         AudioStreamBasicDescription requestedDesc;
  54
  55         /* Setup a AudioStreamBasicDescription with the requested format */
  56         requestedDesc.mFormatID = kAudioFormatLinearPCM;
  57         requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
  58         requestedDesc.mChannelsPerFrame = 2;
  59         requestedDesc.mSampleRate = GetDriverParamInt(parm, "hz", 44100);
  60
  61         requestedDesc.mBitsPerChannel = 16;
  62         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
  63
  64 #if TTD_ENDIAN == TTD_BIG_ENDIAN
  65         requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
  66 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
  67
  68         requestedDesc.mFramesPerPacket = 1;
  69         requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
  70         requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
  71
  72         MxInitialize((uint)requestedDesc.mSampleRate);
  73
  74         /* Locate the default output audio unit */
  75         desc.componentType = kAudioUnitType_Output;
  76         desc.componentSubType = kAudioUnitSubType_HALOutput;
  77         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
  78         desc.componentFlags = 0;
  79         desc.componentFlagsMask = 0;
  80
  81         comp = FindNextComponent (NULL, &desc);
  82         if (comp == NULL) {
  83                 return "cocoa_s: Failed to start CoreAudio: FindNextComponent returned NULL";
  84         }
  85
  86         /* Open & initialize the default output audio unit */
  87         if (OpenAComponent(comp, &_outputAudioUnit) != noErr) {
  88                 return "cocoa_s: Failed to start CoreAudio: OpenAComponent";
  89         }
  90
  91         if (AudioUnitInitialize(_outputAudioUnit) != noErr) {
  92                 return "cocoa_s: Failed to start CoreAudio: AudioUnitInitialize";
  93         }
  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
 100         /* Set the audio callback */
 101         callback.inputProc = audioCallback;
 102         callback.inputProcRefCon = NULL;
 103         if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
 104                 return "cocoa_s: Failed to start CoreAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback)";
 105         }
 106
 107         /* Finally, start processing of the audio unit */
 108         if (AudioOutputUnitStart(_outputAudioUnit) != noErr) {
 109                 return "cocoa_s: Failed to start CoreAudio: AudioOutputUnitStart";
 110         }
 111
 112         /* We're running! */
 113         return NULL;
 114 }
 115
 116
 117 void SoundDriver_Cocoa::Stop()
 118 {
 119         struct AURenderCallbackStruct callback;
 120
 121         /* stop processing the audio unit */
 122         if (AudioOutputUnitStop(_outputAudioUnit) != noErr) {
 123                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioOutputUnitStop failed");
 124                 return;
 125         }
 126
 127         /* Remove the input callback */
 128         callback.inputProc = 0;
 129         callback.inputProcRefCon = 0;
 130         if (AudioUnitSetProperty(_outputAudioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)) != noErr) {
 131                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetRenderCallback) failed");
 132                 return;
 133         }
 134
 135         if (CloseComponent(_outputAudioUnit) != noErr) {
 136                 DEBUG(driver, 0, "cocoa_s: Core_CloseAudio: CloseComponent failed");
 137                 return;
 138         }
 139 }
 140
 141 #endif /* WITH_COCOA */