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annotate src/audio/macrom/SDL_romaudio.c @ 3788:7006b176ef4f SDL-ryan-multiple-audio-device

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More work on the 1.3 CoreAudio code.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 03 Oct 2006 18:32:34 +0000
parents 37c9c4590689
children 866c310e2cb5
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 /* This should work on PowerPC and Intel Mac OS X, and Carbonized Mac OS 9. */
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25
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26 #if defined(__APPLE__) && defined(__MACH__)
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27 # define SDL_MACOS_NAME "Mac OS X"
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28 # include <Carbon/Carbon.h>
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29 #elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335)
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30 # define SDL_MACOS_NAME "Mac OS 9"
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31 # include <Carbon.h>
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32 #else
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33 # define SDL_MACOS_NAME "Mac OS 9"
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34 # include <Sound.h> /* SoundManager interface */
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35 # include <Gestalt.h>
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36 # include <DriverServices.h>
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37 #endif
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38
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39 #if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335)
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40 #if !defined(NewSndCallBackProc) /* avoid circular redefinition... */
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41 #define NewSndCallBackUPP NewSndCallBackProc
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42 #endif
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43 #if !defined(NewSndCallBackUPP)
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44 #define NewSndCallBackUPP NewSndCallBackProc
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45 #endif
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46 #endif
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47
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48 #include "SDL_audio.h"
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49 #include "../SDL_audio_c.h"
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50 #include "../SDL_sysaudio.h"
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51 #include "SDL_romaudio.h"
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52
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53 /* Audio driver functions */
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54
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55 static void SNDMGR_CloseAudio(_THIS);
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56 static int SNDMGR_OpenAudio(_THIS, const char *devname, int iscapture);
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57 static void SNDMGR_LockAudio(_THIS);
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58 static void SNDMGR_UnlockAudio(_THIS);
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59
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60 /* Audio driver bootstrap functions */
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61
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62
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63 static int
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64 SNDMGR_Available(void)
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65 {
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66 return (1);
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67 }
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68
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69
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70 static int
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71 SNDMGR_Init(SDL_AudioDriverImpl *impl)
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72 {
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73 /* Set the function pointers */
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74 impl->OpenAudio = SNDMGR_OpenAudio;
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75 impl->CloseAudio = SNDMGR_CloseAudio;
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76 impl->LockAudio = SNDMGR_LockAudio;
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77 impl->UnlockAudio = SNDMGR_UnlockAudio;
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78
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79 #ifdef __MACOSX__ /* Mac OS X uses threaded audio, so normal thread code is okay */
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80 impl->LockAudio = NULL;
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81 impl->UnlockAudio = NULL;
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82 #endif
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83
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84 return 1;
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85 }
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86
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87 AudioBootStrap SNDMGR_bootstrap = {
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88 "sndmgr", SDL_MACOS_NAME " SoundManager",
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89 SNDMGR_Available, SNDMGR_Init
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90 };
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91
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92 #pragma options align=power
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93
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94 static volatile int audio_is_opened = 0;
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95 static volatile SInt32 audio_is_locked = 0;
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96 static volatile SInt32 need_to_mix = 0;
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97
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98 static UInt8 *buffer[2];
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99 static volatile UInt32 running = 0;
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100 static CmpSoundHeader header;
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101 static volatile Uint32 fill_me = 0;
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102
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103 static void
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104 mix_buffer(SDL_AudioDevice * audio, UInt8 * buffer)
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105 {
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106 if (!audio->paused) {
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107 #ifdef __MACOSX__
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108 SDL_mutexP(audio->mixer_lock);
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109 #endif
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110 if (audio->convert.needed) {
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111 audio->spec.callback(audio->spec.userdata,
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112 (Uint8 *) audio->convert.buf,
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113 audio->convert.len);
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114 SDL_ConvertAudio(&audio->convert);
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115 if (audio->convert.len_cvt != audio->spec.size) {
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116 /* Uh oh... probably crashes here */ ;
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117 }
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118 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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119 } else {
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120 audio->spec.callback(audio->spec.userdata, buffer,
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121 audio->spec.size);
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122 }
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123 #ifdef __MACOSX__
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124 SDL_mutexV(audio->mixer_lock);
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125 #endif
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126 }
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127
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128 DecrementAtomic((SInt32 *) & need_to_mix);
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129 }
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130
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131 static void
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132 SNDMGR_LockAudio(_THIS)
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133 {
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134 IncrementAtomic((SInt32 *) & audio_is_locked);
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135 }
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136
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137 static void
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138 SNDMGR_UnlockAudio(_THIS)
323
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139 {
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140 SInt32 oldval;
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141
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142 oldval = DecrementAtomic((SInt32 *) & audio_is_locked);
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143 if (oldval != 1) /* != 1 means audio is still locked. */
323
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144 return;
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145
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146 /* Did we miss the chance to mix in an interrupt? Do it now. */
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147 if (BitAndAtomic(0xFFFFFFFF, (UInt32 *) & need_to_mix)) {
323
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148 /*
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149 * Note that this could be a problem if you missed an interrupt
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150 * while the audio was locked, and get preempted by a second
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151 * interrupt here, but that means you locked for way too long anyhow.
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152 */
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153 mix_buffer(this, buffer[fill_me]);
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154 }
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155 }
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156
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157 static void
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158 callBackProc(SndChannel * chan, SndCommand * cmd_passed)
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159 {
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160 UInt32 play_me;
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161 SndCommand cmd;
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162 SDL_AudioDevice *audio = (SDL_AudioDevice *) chan->userInfo;
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163
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164 IncrementAtomic((SInt32 *) & need_to_mix);
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165
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166 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */
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167 play_me = !fill_me; /* filled buffer to play _now_ */
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168
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169 if (!audio->enabled) {
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170 return;
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171 }
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172
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173 /* queue previously mixed buffer for playback. */
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174 header.samplePtr = (Ptr) buffer[play_me];
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175 cmd.cmd = bufferCmd;
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176 cmd.param1 = 0;
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177 cmd.param2 = (long) &header;
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178 SndDoCommand(chan, &cmd, 0);
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179
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180 memset(buffer[fill_me], 0, audio->spec.size);
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181
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182 /*
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183 * if audio device isn't locked, mix the next buffer to be queued in
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184 * the memory block that just finished playing.
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185 */
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186 if (!BitAndAtomic(0xFFFFFFFF, (UInt32 *) & audio_is_locked)) {
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187 mix_buffer(audio, buffer[fill_me]);
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188 }
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189
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190 /* set this callback to run again when current buffer drains. */
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191 if (running) {
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192 cmd.cmd = callBackCmd;
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193 cmd.param1 = 0;
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194 cmd.param2 = play_me;
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195
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196 SndDoCommand(chan, &cmd, 0);
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197 }
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198 }
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199
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200 static int
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201 SNDMGR_OpenAudio(_THIS, const char *devname, int iscapture)
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202 {
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203 SDL_AudioSpec *spec = &this->spec;
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204 SndChannelPtr channel = NULL;
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205 SndCallBackUPP callback;
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206 int sample_bits;
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207 int i;
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208 long initOptions;
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209
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210 if (audio_is_opened) {
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211 SDL_SetError("SoundManager driver doesn't support multiple opens");
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212 return 0;
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213 }
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214
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215 if (iscapture) {
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216 SDL_SetError("SoundManager driver doesn't support recording");
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217 return 0;
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218 }
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219
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220 /* !!! FIXME: ignore devname? */
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221
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222 /* Initialize all variables that we clean on shutdown */
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223 this->hidden = (struct SDL_PrivateAudioData *)
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224 SDL_malloc((sizeof *this->hidden));
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225 if (this->hidden == NULL) {
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226 SDL_OutOfMemory();
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227 return 0;
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228 }
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229 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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230
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231 /* !!! FIXME: check devname and iscapture... */
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232
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233 /* !!! FIXME: iterate through format matrix... */
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234 /* Very few conversions are required, but... */
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235 switch (spec->format) {
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236 case AUDIO_S8:
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237 spec->format = AUDIO_U8;
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238 break;
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239 case AUDIO_U16LSB:
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240 spec->format = AUDIO_S16LSB;
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241 break;
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242 case AUDIO_U16MSB:
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243 spec->format = AUDIO_S16MSB;
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244 break;
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245 case AUDIO_F32LSB:
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246 spec->format = AUDIO_F32MSB;
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247 break;
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248 }
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249 SDL_CalculateAudioSpec(&this->spec);
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250
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251 /* initialize bufferCmd header */
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252 memset(&header, 0, sizeof(header));
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253 callback = (SndCallBackUPP) NewSndCallBackUPP(callBackProc);
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254 sample_bits = spec->size / spec->samples / spec->channels * 8;
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255
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256 #ifdef DEBUG_AUDIO
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257 fprintf(stderr,
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258 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n",
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259 spec->format, spec->channels, sample_bits, spec->freq);
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260 #endif /* DEBUG_AUDIO */
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261
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262 header.numChannels = spec->channels;
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263 header.sampleSize = sample_bits;
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264 header.sampleRate = spec->freq << 16;
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265 header.numFrames = spec->samples;
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266 header.encode = cmpSH;
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diff changeset
267
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268 /* Note that we install the 16bitLittleEndian Converter if needed. */
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269 if (spec->format == AUDIO_S16LSB) {
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270 header.compressionID = fixedCompression;
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271 header.format = k16BitLittleEndianFormat;
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272 } else if (spec->format == AUDIO_S32MSB) {
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273 header.compressionID = fixedCompression;
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274 header.format = k32BitFormat;
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275 } else if (spec->format == AUDIO_S32LSB) {
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276 header.compressionID = fixedCompression;
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277 header.format = k32BitLittleEndianFormat;
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278 } else if (spec->format == AUDIO_F32MSB) {
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279 header.compressionID = fixedCompression;
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280 header.format = kFloat32Format;
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281 }
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282
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283 /* allocate 2 buffers */
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284 for (i = 0; i < 2; i++) {
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285 buffer[i] = (UInt8 *) malloc(sizeof(UInt8) * spec->size);
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286 if (buffer[i] == NULL) {
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287 SNDMGR_CloseAudio(this);
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288 SDL_OutOfMemory();
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289 return 0;
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290 }
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291 memset(buffer[i], 0, spec->size);
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292 }
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293
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294 /* Create the sound manager channel */
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295 channel = (SndChannelPtr) SDL_malloc(sizeof(*channel));
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296 if (channel == NULL) {
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297 SNDMGR_CloseAudio(this);
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298 SDL_OutOfMemory();
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299 return 0;
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300 }
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301 this->hidden->channel = channel;
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302 if (spec->channels >= 2) {
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303 initOptions = initStereo;
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304 } else {
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305 initOptions = initMono;
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306 }
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307 channel->userInfo = (long) this;
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308 channel->qLength = 128;
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309 if (SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr) {
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310 SNDMGR_CloseAudio(this);
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311 SDL_SetError("Unable to create audio channel");
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312 return 0;
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313 }
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314
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315 /* start playback */
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316 {
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317 SndCommand cmd;
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318 cmd.cmd = callBackCmd;
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319 cmd.param2 = 0;
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320 running = 1;
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321 SndDoCommand(channel, &cmd, 0);
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322 }
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323
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324 audio_is_opened = 1;
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325 return 1;
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326 }
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327
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328 static void
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329 SNDMGR_CloseAudio(_THIS)
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330 {
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331
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332 int i;
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333
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334 running = 0;
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335
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336 if (this->hidden->channel) {
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337 SndDisposeChannel(this->hidden->channel, true);
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338 this->hidden->channel = NULL;
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339 }
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340
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341 for (i = 0; i < 2; ++i) {
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342 if (buffer[i]) {
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343 SDL_free(buffer[i]);
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344 buffer[i] = NULL;
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345 }
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346 }
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347 SDL_free(this->hidden);
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348 this->hidden = NULL;
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349 audio_is_opened = 0;
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350 }
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351
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352 /* vi: set ts=4 sw=4 expandtab: */