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annotate src/audio/macosx/SDL_coreaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents dc6b59e925a2
children 4da1ee79c9af
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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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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diff changeset
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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125 (*this->spec.callback) (this->spec.userdata, buffer, bufferSize);
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126 SDL_mutexV (this->mixer_lock);
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127 bufferOffset = 0;
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diff changeset
128 }
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129
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130 len = bufferSize - bufferOffset;
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diff changeset
131 if (len > remaining)
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132 len = remaining;
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133 SDL_memcpy (ptr, (char *) buffer + bufferOffset, len);
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134 ptr = (char *) ptr + len;
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135 remaining -= len;
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136 bufferOffset += len;
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137 }
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138
935
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139 return 0;
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140 }
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141
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142 /* Dummy functions -- we don't use thread-based audio */
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143 void
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144 Core_WaitAudio (_THIS)
935
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145 {
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146 return;
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147 }
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diff changeset
148
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149 void
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150 Core_PlayAudio (_THIS)
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151 {
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152 return;
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153 }
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diff changeset
154
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155 Uint8 *
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156 Core_GetAudioBuf (_THIS)
935
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diff changeset
157 {
1662
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158 return (NULL);
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diff changeset
159 }
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diff changeset
160
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161 void
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162 Core_CloseAudio (_THIS)
935
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diff changeset
163 {
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diff changeset
164 OSStatus result;
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165 struct AudioUnitInputCallback callback;
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166
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diff changeset
167 /* stop processing the audio unit */
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diff changeset
168 result = AudioOutputUnitStop (outputAudioUnit);
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diff changeset
169 if (result != noErr) {
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170 SDL_SetError ("Core_CloseAudio: AudioOutputUnitStop");
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171 return;
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172 }
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diff changeset
173
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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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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));
935
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181 if (result != noErr) {
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182 SDL_SetError
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183 ("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
935
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diff changeset
184 return;
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diff changeset
185 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
186
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187 result = CloseComponent (outputAudioUnit);
935
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diff changeset
188 if (result != noErr) {
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189 SDL_SetError ("Core_CloseAudio: CloseComponent");
935
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diff changeset
190 return;
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diff changeset
191 }
1662
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diff changeset
192
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diff changeset
193 SDL_free (buffer);
935
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diff changeset
194 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
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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diff changeset
197 if (result != noErr) { \
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diff changeset
198 SDL_SetError("Failed to start CoreAudio: " msg); \
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diff changeset
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
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parents:
diff changeset
202
1662
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diff changeset
203 int
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diff changeset
204 Core_OpenAudio (_THIS, SDL_AudioSpec * spec)
935
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diff changeset
205 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
206 OSStatus result = noErr;
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diff changeset
207 Component comp;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
208 ComponentDescription desc;
936
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diff changeset
209 struct AudioUnitInputCallback callback;
935
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diff changeset
210 AudioStreamBasicDescription requestedDesc;
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parents:
diff changeset
211
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
212 /* Setup a AudioStreamBasicDescription with the requested format */
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diff changeset
213 requestedDesc.mFormatID = kAudioFormatLinearPCM;
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parents:
diff changeset
214 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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parents:
diff changeset
215 requestedDesc.mChannelsPerFrame = spec->channels;
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parents:
diff changeset
216 requestedDesc.mSampleRate = spec->freq;
1662
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diff changeset
217
935
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diff changeset
218 requestedDesc.mBitsPerChannel = spec->format & 0xFF;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
219 if (spec->format & 0x8000)
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parents:
diff changeset
220 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
221 if (spec->format & 0x1000)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
222 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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parents:
diff changeset
223
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
224 requestedDesc.mFramesPerPacket = 1;
1662
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diff changeset
225 requestedDesc.mBytesPerFrame =
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diff changeset
226 requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
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diff changeset
227 requestedDesc.mBytesPerPacket =
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diff changeset
228 requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
935
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parents:
diff changeset
229
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
231 /* Locate the default output audio unit */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
232 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
233 desc.componentSubType = kAudioUnitSubType_Output;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
235 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
236 desc.componentFlagsMask = 0;
1662
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diff changeset
237
935
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parents:
diff changeset
238 comp = FindNextComponent (NULL, &desc);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
239 if (comp == NULL) {
1662
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diff changeset
240 SDL_SetError
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diff changeset
241 ("Failed to start CoreAudio: FindNextComponent returned NULL");
935
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diff changeset
242 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
243 }
1662
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diff changeset
244
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245 /* Open & initialize the default output audio unit */
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246 result = OpenAComponent (comp, &outputAudioUnit);
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247 CHECK_RESULT ("OpenAComponent")
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248 result = AudioUnitInitialize (outputAudioUnit);
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249 CHECK_RESULT ("AudioUnitInitialize")
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250 /* Set the input format of the audio unit. */
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251 result = AudioUnitSetProperty (outputAudioUnit,
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252 kAudioUnitProperty_StreamFormat,
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253 kAudioUnitScope_Input,
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254 0,
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255 &requestedDesc,
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256 sizeof (requestedDesc));
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257 CHECK_RESULT ("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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258 /* Set the audio callback */
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259 callback.inputProc = audioCallback;
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260 callback.inputProcRefCon = this;
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261 result = AudioUnitSetProperty (outputAudioUnit,
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262 kAudioUnitProperty_SetInputCallback,
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263 kAudioUnitScope_Input,
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264 0, &callback, sizeof (callback));
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265 CHECK_RESULT
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266 ("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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267 /* Calculate the final parameters for this audio specification */
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268 SDL_CalculateAudioSpec (spec);
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269
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270 /* Allocate a sample buffer */
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271 bufferOffset = bufferSize = this->spec.size;
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272 buffer = SDL_malloc (bufferSize);
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273
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274 /* Finally, start processing of the audio unit */
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275 result = AudioOutputUnitStart (outputAudioUnit);
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276 CHECK_RESULT ("AudioOutputUnitStart")
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277 /* We're running! */
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278 return (1);
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279 }
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280
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281 /* vi: set ts=4 sw=4 expandtab: */