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annotate src/audio/macosx/SDL_coreaudio.c @ 2011:b2b7154ce016

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Fixed broken audio conversions between float and unsigned datatypes.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Sep 2006 18:07:41 +0000
parents 506851d3efa4
children 72fa74928062
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include <AudioUnit/AudioUnit.h>
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25
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26 #include "SDL_audio.h"
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27 #include "../SDL_audio_c.h"
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28 #include "../SDL_sysaudio.h"
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29 #include "SDL_coreaudio.h"
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30
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31
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32 /* Audio driver functions */
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33
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34 static int Core_OpenAudio(_THIS, SDL_AudioSpec * spec);
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35 static void Core_WaitAudio(_THIS);
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36 static void Core_PlayAudio(_THIS);
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37 static Uint8 *Core_GetAudioBuf(_THIS);
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38 static void Core_CloseAudio(_THIS);
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39
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40 /* Audio driver bootstrap functions */
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41
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42 static int
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43 Audio_Available(void)
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44 {
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45 return (1);
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46 }
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47
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48 static void
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49 Audio_DeleteDevice(SDL_AudioDevice * device)
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50 {
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51 SDL_free(device->hidden);
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52 SDL_free(device);
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53 }
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54
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55 static SDL_AudioDevice *
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56 Audio_CreateDevice(int devindex)
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57 {
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58 SDL_AudioDevice *this;
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59
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60 /* Initialize all variables that we clean on shutdown */
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61 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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62 if (this) {
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63 SDL_memset(this, 0, (sizeof *this));
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64 this->hidden = (struct SDL_PrivateAudioData *)
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65 SDL_malloc((sizeof *this->hidden));
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66 }
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67 if ((this == NULL) || (this->hidden == NULL)) {
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68 SDL_OutOfMemory();
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69 if (this) {
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70 SDL_free(this);
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71 }
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72 return (0);
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73 }
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74 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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75
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76 /* Set the function pointers */
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77 this->OpenAudio = Core_OpenAudio;
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78 this->WaitAudio = Core_WaitAudio;
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79 this->PlayAudio = Core_PlayAudio;
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80 this->GetAudioBuf = Core_GetAudioBuf;
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81 this->CloseAudio = Core_CloseAudio;
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82
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83 this->free = Audio_DeleteDevice;
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84
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85 return this;
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86 }
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87
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88 AudioBootStrap COREAUDIO_bootstrap = {
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89 "coreaudio", "Mac OS X CoreAudio",
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90 Audio_Available, Audio_CreateDevice
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91 };
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92
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93 /* The CoreAudio callback */
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94 static OSStatus
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95 audioCallback(void *inRefCon,
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96 AudioUnitRenderActionFlags inActionFlags,
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97 const AudioTimeStamp * inTimeStamp,
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98 UInt32 inBusNumber, AudioBuffer * ioData)
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99 {
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100 SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
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101 UInt32 remaining, len;
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102 void *ptr;
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103
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104 /* Only do anything if audio is enabled and not paused */
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105 if (!this->enabled || this->paused) {
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106 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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107 return 0;
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108 }
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109
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110 /* No SDL conversion should be needed here, ever, since we accept
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111 any input format in OpenAudio, and leave the conversion to CoreAudio.
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112 */
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113 /*
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114 assert(!this->convert.needed);
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115 assert(this->spec.channels == ioData->mNumberChannels);
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116 */
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117
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118 remaining = ioData->mDataByteSize;
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119 ptr = ioData->mData;
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120 while (remaining > 0) {
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121 if (bufferOffset >= bufferSize) {
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122 /* Generate the data */
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123 SDL_memset(buffer, this->spec.silence, bufferSize);
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124 SDL_mutexP(this->mixer_lock);
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parents: 1487
diff changeset
125 (*this->spec.callback) (this->spec.userdata, buffer, bufferSize);
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diff changeset
126 SDL_mutexV(this->mixer_lock);
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diff changeset
127 bufferOffset = 0;
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diff changeset
128 }
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diff changeset
129
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diff changeset
130 len = bufferSize - bufferOffset;
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diff changeset
131 if (len > remaining)
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diff changeset
132 len = remaining;
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diff changeset
133 SDL_memcpy(ptr, (char *) buffer + bufferOffset, len);
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diff changeset
134 ptr = (char *) ptr + len;
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135 remaining -= len;
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diff changeset
136 bufferOffset += len;
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diff changeset
137 }
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diff changeset
138
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139 return 0;
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parents:
diff changeset
140 }
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diff changeset
141
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diff changeset
142 /* Dummy functions -- we don't use thread-based audio */
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diff changeset
143 void
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diff changeset
144 Core_WaitAudio(_THIS)
935
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diff changeset
145 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
146 return;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
147 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
148
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diff changeset
149 void
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diff changeset
150 Core_PlayAudio(_THIS)
935
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diff changeset
151 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
152 return;
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153 }
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diff changeset
154
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diff changeset
155 Uint8 *
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diff changeset
156 Core_GetAudioBuf(_THIS)
935
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157 {
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158 return (NULL);
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diff changeset
159 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
160
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diff changeset
161 void
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162 Core_CloseAudio(_THIS)
935
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diff changeset
163 {
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164 OSStatus result;
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165 struct AudioUnitInputCallback callback;
935
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166
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167 /* stop processing the audio unit */
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168 result = AudioOutputUnitStop(outputAudioUnit);
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169 if (result != noErr) {
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170 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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diff changeset
171 return;
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parents:
diff changeset
172 }
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diff changeset
173
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
174 /* Remove the input callback */
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diff changeset
175 callback.inputProc = 0;
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diff changeset
176 callback.inputProcRefCon = 0;
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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177 result = AudioUnitSetProperty(outputAudioUnit,
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178 kAudioUnitProperty_SetInputCallback,
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179 kAudioUnitScope_Input,
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diff changeset
180 0, &callback, sizeof(callback));
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181 if (result != noErr) {
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182 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
183 ("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
935
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184 return;
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185 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
186
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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187 result = CloseComponent(outputAudioUnit);
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188 if (result != noErr) {
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diff changeset
189 SDL_SetError("Core_CloseAudio: CloseComponent");
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190 return;
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191 }
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192
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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193 SDL_free(buffer);
935
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194 }
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195
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
196 #define CHECK_RESULT(msg) \
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197 if (result != noErr) { \
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198 SDL_SetError("Failed to start CoreAudio: " msg); \
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199 return -1; \
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diff changeset
200 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
201
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
202
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203 int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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204 Core_OpenAudio(_THIS, SDL_AudioSpec * spec)
935
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205 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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206 OSStatus result = noErr;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
207 Component comp;
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208 ComponentDescription desc;
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diff changeset
209 struct AudioUnitInputCallback callback;
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
210 AudioStreamBasicDescription desc;
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diff changeset
211 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format);
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diff changeset
212 int valid_datatype = 0;
935
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diff changeset
213
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
214 /* Setup a AudioStreamBasicDescription with the requested format */
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
215 memset(&desc, '\0', sizeof (AudioStreamBasicDescription));
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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parents: 1895
diff changeset
216 desc.mFormatID = kAudioFormatLinearPCM;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
217 desc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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parents: 1895
diff changeset
218 desc.mChannelsPerFrame = spec->channels;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
219 desc.mSampleRate = spec->freq;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
220 desc.mFramesPerPacket = 1;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
221
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
222 while ((!valid_datatype) && (test_format)) {
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
223 spec->format = test_format;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
224 desc.mFormatFlags = 0;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
225 /* Just a list of valid SDL formats, so people don't pass junk here. */
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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parents: 1895
diff changeset
226 switch (test_format) {
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
227 case AUDIO_U8:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
228 case AUDIO_S8:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
229 case AUDIO_U16LSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
230 case AUDIO_S16LSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
231 case AUDIO_U16MSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
232 case AUDIO_S16MSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
233 case AUDIO_S32LSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
234 case AUDIO_S32MSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
235 case AUDIO_F32LSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
236 case AUDIO_F32MSB:
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
237 valid_datatype = 1;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
238 desc.mBitsPerChannel = SDL_AUDIO_BITSIZE(spec->format);
935
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parents:
diff changeset
239
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
240 if (SDL_AUDIO_ISFLOAT(spec->format))
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
241 desc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
242 else if (SDL_AUDIO_ISSIGNED(spec->format))
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
243 desc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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parents: 1895
diff changeset
244
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
245 if (SDL_AUDIO_ISBIGENDIAN(spec->format))
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
246 desc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
247 break;
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
248 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
249 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
250
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
251 if (!valid_datatype) { /* shouldn't happen, but just in case... */
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
252 SDL_SetError("Unsupported audio format");
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
253 return (-1);
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
254 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
255
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
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256 desc.mBytesPerFrame =
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257 desc.mBitsPerChannel * desc.mChannelsPerFrame / 8;
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258 desc.mBytesPerPacket =
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259 desc.mBytesPerFrame * desc.mFramesPerPacket;
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260
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261
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262 /* Locate the default output audio unit */
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263 desc.componentType = kAudioUnitComponentType;
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264 desc.componentSubType = kAudioUnitSubType_Output;
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265 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
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266 desc.componentFlags = 0;
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267 desc.componentFlagsMask = 0;
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268
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269 comp = FindNextComponent(NULL, &desc);
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270 if (comp == NULL) {
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271 SDL_SetError
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272 ("Failed to start CoreAudio: FindNextComponent returned NULL");
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273 return -1;
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274 }
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275
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276 /* Open & initialize the default output audio unit */
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277 result = OpenAComponent(comp, &outputAudioUnit);
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278 CHECK_RESULT("OpenAComponent")
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279 result = AudioUnitInitialize(outputAudioUnit);
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280 CHECK_RESULT("AudioUnitInitialize")
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281 /* Set the input format of the audio unit. */
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282 result = AudioUnitSetProperty(outputAudioUnit,
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283 kAudioUnitProperty_StreamFormat,
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284 kAudioUnitScope_Input,
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285 0,
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286 &desc, sizeof (desc));
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287 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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288 /* Set the audio callback */
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289 callback.inputProc = audioCallback;
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290 callback.inputProcRefCon = this;
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291 result = AudioUnitSetProperty(outputAudioUnit,
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292 kAudioUnitProperty_SetInputCallback,
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293 kAudioUnitScope_Input,
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294 0, &callback, sizeof(callback));
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295 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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296 /* Calculate the final parameters for this audio specification */
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297 SDL_CalculateAudioSpec(spec);
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298
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299 /* Allocate a sample buffer */
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300 bufferOffset = bufferSize = this->spec.size;
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301 buffer = SDL_malloc(bufferSize);
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302
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303 /* Finally, start processing of the audio unit */
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304 result = AudioOutputUnitStart(outputAudioUnit);
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305 CHECK_RESULT("AudioOutputUnitStart")
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306 /* We're running! */
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307 return (1);
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308 }
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309
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310 /* vi: set ts=4 sw=4 expandtab: */