Mercurial > sdl-ios-xcode
annotate src/audio/macrom/SDL_romaudio.c @ 323:b7e8038e40ae
The audio lock and unlock functions are now a part of the driver.
The MacOS audio locking has been implemented, courtesy of Ryan Gordon
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 30 Mar 2002 20:03:27 +0000 |
| parents | f6ffac90895c |
| children | f25f666d609a |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #if TARGET_API_MAC_CARBON | |
| 29 # include <Carbon.h> | |
| 30 #else | |
| 31 # include <Sound.h> /* SoundManager interface */ | |
| 32 # include <Gestalt.h> | |
|
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33 # include <DriverServices.h> |
| 0 | 34 #endif |
| 35 | |
| 36 #include <stdlib.h> | |
| 37 #include <stdio.h> | |
| 38 | |
| 39 #include "SDL_endian.h" | |
| 40 #include "SDL_audio.h" | |
| 41 #include "SDL_audio_c.h" | |
| 42 #include "SDL_audiomem.h" | |
| 43 #include "SDL_sysaudio.h" | |
| 44 #include "SDL_romaudio.h" | |
| 45 | |
| 46 /* Audio driver functions */ | |
| 47 | |
| 48 static void Mac_CloseAudio(_THIS); | |
| 49 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
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50 static void Mac_LockAudio(_THIS); |
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51 static void Mac_UnlockAudio(_THIS); |
| 0 | 52 |
| 53 /* Audio driver bootstrap functions */ | |
| 54 | |
| 55 | |
| 56 static int Audio_Available(void) | |
| 57 { | |
| 58 return(1); | |
| 59 } | |
| 60 | |
| 61 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 62 { | |
| 63 free(device->hidden); | |
| 64 free(device); | |
| 65 } | |
| 66 | |
| 67 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 68 { | |
| 69 SDL_AudioDevice *this; | |
| 70 | |
| 71 /* Initialize all variables that we clean on shutdown */ | |
| 72 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 73 if ( this ) { | |
| 74 memset(this, 0, (sizeof *this)); | |
| 75 this->hidden = (struct SDL_PrivateAudioData *) | |
| 76 malloc((sizeof *this->hidden)); | |
| 77 } | |
| 78 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 79 SDL_OutOfMemory(); | |
| 80 if ( this ) { | |
| 81 free(this); | |
| 82 } | |
| 83 return(0); | |
| 84 } | |
| 85 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 86 | |
| 87 /* Set the function pointers */ | |
| 88 this->OpenAudio = Mac_OpenAudio; | |
| 89 this->CloseAudio = Mac_CloseAudio; | |
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90 this->LockAudio = Mac_LockAudio; |
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91 this->UnlockAudio = Mac_UnlockAudio; |
| 0 | 92 this->free = Audio_DeleteDevice; |
| 93 | |
| 94 return this; | |
| 95 } | |
| 96 | |
| 97 AudioBootStrap SNDMGR_bootstrap = { | |
| 98 "sndmgr", "MacOS SoundManager 3.0", | |
| 99 Audio_Available, Audio_CreateDevice | |
| 100 }; | |
| 101 | |
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102 #if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE) |
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103 /* FIXME: Does this work correctly on MacOS X as well? */ |
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104 |
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105 #pragma options align=power |
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106 |
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107 static volatile SInt32 audio_is_locked = 0; |
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108 static volatile SInt32 need_to_mix = 0; |
| 0 | 109 |
| 110 static UInt8 *buffer[2]; | |
| 111 static volatile UInt32 running = 0; | |
| 112 static CmpSoundHeader header; | |
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113 static volatile Uint32 fill_me = 0; |
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114 |
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115 static void mix_buffer(SDL_AudioDevice *audio, UInt8 *buffer) |
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116 { |
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117 if ( ! audio->paused ) { |
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118 if ( audio->convert.needed ) { |
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119 audio->spec.callback(audio->spec.userdata, |
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120 (Uint8 *)audio->convert.buf,audio->convert.len); |
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121 SDL_ConvertAudio(&audio->convert); |
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122 #if 0 |
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123 if ( audio->convert.len_cvt != audio->spec.size ) { |
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124 /* Uh oh... probably crashes here; */ |
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125 } |
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126 #endif |
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127 memcpy(buffer, audio->convert.buf, audio->convert.len_cvt); |
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128 } else { |
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129 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size); |
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130 } |
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131 } |
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132 |
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133 DecrementAtomic((SInt32 *) &need_to_mix); |
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134 } |
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135 |
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136 static void Mac_LockAudio(_THIS) |
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137 { |
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138 IncrementAtomic((SInt32 *) &audio_is_locked); |
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139 } |
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140 |
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141 static void Mac_UnlockAudio(_THIS) |
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142 { |
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143 SInt32 oldval; |
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144 |
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145 oldval = DecrementAtomic((SInt32 *) &audio_is_locked); |
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146 if ( oldval != 1 ) /* != 1 means audio is still locked. */ |
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147 return; |
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148 |
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149 /* Did we miss the chance to mix in an interrupt? Do it now. */ |
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150 if ( BitAndAtomic (0xFFFFFFFF, &need_to_mix) ) { |
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151 /* |
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152 * Note that this could be a problem if you missed an interrupt |
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153 * while the audio was locked, and get preempted by a second |
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154 * interrupt here, but that means you locked for way too long anyhow. |
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155 */ |
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156 mix_buffer (this, buffer[fill_me]); |
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157 } |
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158 } |
| 0 | 159 |
| 160 static void callBackProc (SndChannel *chan, SndCommand *cmd_passed ) { | |
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161 UInt32 play_me; |
| 0 | 162 SndCommand cmd; |
| 163 SDL_AudioDevice *audio = (SDL_AudioDevice *)chan->userInfo; | |
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164 |
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165 IncrementAtomic((SInt32 *) &need_to_mix); |
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166 |
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167 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */ |
| 0 | 168 play_me = ! fill_me; /* filled buffer to play _now_ */ |
| 169 | |
| 170 if ( ! audio->enabled ) { | |
| 171 return; | |
| 172 } | |
| 173 | |
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174 /* queue previously mixed buffer for playback. */ |
| 0 | 175 header.samplePtr = (Ptr)buffer[play_me]; |
| 176 cmd.cmd = bufferCmd; | |
| 177 cmd.param1 = 0; | |
| 178 cmd.param2 = (long)&header; | |
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179 SndDoCommand (chan, &cmd, 0); |
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180 |
| 0 | 181 memset (buffer[fill_me], 0, audio->spec.size); |
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182 |
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183 /* |
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184 * if audio device isn't locked, mix the next buffer to be queued in |
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185 * the memory block that just finished playing. |
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186 */ |
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187 if ( ! BitAndAtomic(0xFFFFFFFF, &audio_is_locked) ) { |
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188 mix_buffer (audio, buffer[fill_me]); |
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189 } |
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190 |
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191 /* set this callback to run again when current buffer drains. */ |
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192 if ( running ) { |
| 0 | 193 cmd.cmd = callBackCmd; |
| 194 cmd.param1 = 0; | |
| 195 cmd.param2 = play_me; | |
| 196 | |
| 197 SndDoCommand (chan, &cmd, 0); | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) { | |
| 202 | |
| 203 SndCallBackUPP callback; | |
| 204 int sample_bits; | |
| 205 int i; | |
| 206 long initOptions; | |
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207 |
| 0 | 208 /* Very few conversions are required, but... */ |
| 209 switch (spec->format) { | |
| 210 case AUDIO_S8: | |
| 211 spec->format = AUDIO_U8; | |
| 212 break; | |
| 213 case AUDIO_U16LSB: | |
| 214 spec->format = AUDIO_S16LSB; | |
| 215 break; | |
| 216 case AUDIO_U16MSB: | |
| 217 spec->format = AUDIO_S16MSB; | |
| 218 break; | |
| 219 } | |
| 220 SDL_CalculateAudioSpec(spec); | |
| 221 | |
| 222 /* initialize bufferCmd header */ | |
| 223 memset (&header, 0, sizeof(header)); | |
| 224 callback = NewSndCallBackUPP (callBackProc); | |
| 225 sample_bits = spec->size / spec->samples / spec->channels * 8; | |
| 226 | |
| 227 #ifdef DEBUG_AUDIO | |
| 228 fprintf(stderr, | |
| 229 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n", | |
| 230 spec->format, spec->channels, sample_bits, spec->freq); | |
| 231 #endif /* DEBUG_AUDIO */ | |
| 232 | |
| 233 header.numChannels = spec->channels; | |
| 234 header.sampleSize = sample_bits; | |
| 235 header.sampleRate = spec->freq << 16; | |
| 236 header.numFrames = spec->samples; | |
| 237 header.encode = cmpSH; | |
| 238 | |
| 239 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 240 if ( spec->format == 0x8010 ) { | |
| 241 header.compressionID = fixedCompression; | |
| 242 header.format = k16BitLittleEndianFormat; | |
| 243 } | |
| 244 | |
| 245 /* allocate 2 buffers */ | |
| 246 for (i=0; i<2; i++) { | |
| 247 buffer[i] = (UInt8*)malloc (sizeof(UInt8) * spec->size); | |
| 248 if (buffer[i] == NULL) { | |
| 249 SDL_OutOfMemory(); | |
| 250 return (-1); | |
| 251 } | |
| 252 memset (buffer[i], 0, spec->size); | |
| 253 } | |
| 254 | |
| 255 /* Create the sound manager channel */ | |
| 256 channel = (SndChannelPtr)malloc(sizeof(*channel)); | |
| 257 if ( channel == NULL ) { | |
| 258 SDL_OutOfMemory(); | |
| 259 return(-1); | |
| 260 } | |
| 261 if ( spec->channels >= 2 ) { | |
| 262 initOptions = initStereo; | |
| 263 } else { | |
| 264 initOptions = initMono; | |
| 265 } | |
| 266 channel->userInfo = (long)this; | |
| 267 channel->qLength = 128; | |
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268 if ( SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr ) { |
| 0 | 269 SDL_SetError("Unable to create audio channel"); |
| 270 free(channel); | |
| 271 channel = NULL; | |
| 272 return(-1); | |
| 273 } | |
| 274 | |
| 275 /* start playback */ | |
| 276 { | |
| 277 SndCommand cmd; | |
| 278 cmd.cmd = callBackCmd; | |
| 279 cmd.param2 = 0; | |
| 280 running = 1; | |
| 281 SndDoCommand (channel, &cmd, 0); | |
| 282 } | |
| 283 | |
| 284 return 1; | |
| 285 } | |
| 286 | |
| 287 static void Mac_CloseAudio(_THIS) { | |
| 288 | |
| 289 int i; | |
| 290 | |
| 291 running = 0; | |
| 292 | |
| 293 if (channel) { | |
| 294 SndDisposeChannel (channel, true); | |
| 295 channel = NULL; | |
| 296 } | |
| 297 | |
| 298 for ( i=0; i<2; ++i ) { | |
| 299 if ( buffer[i] ) { | |
| 300 free(buffer[i]); | |
| 301 buffer[i] = NULL; | |
| 302 } | |
| 303 } | |
| 304 } | |
| 305 | |
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306 #else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */ |
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307 |
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308 static void Mac_LockAudio(_THIS) |
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309 { |
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310 /* no-op. */ |
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311 } |
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312 |
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313 static void Mac_UnlockAudio(_THIS) |
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314 { |
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315 /* no-op. */ |
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316 } |
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317 |
| 0 | 318 |
| 319 /* This function is called by Sound Manager when it has exhausted one of | |
| 320 the buffers, so we'll zero it to silence and fill it with audio if | |
| 321 we're not paused. | |
| 322 */ | |
| 323 static pascal | |
| 324 void sndDoubleBackProc (SndChannelPtr chan, SndDoubleBufferPtr newbuf) | |
| 325 { | |
| 326 SDL_AudioDevice *audio = (SDL_AudioDevice *)newbuf->dbUserInfo[0]; | |
| 327 | |
| 328 /* If audio is quitting, don't do anything */ | |
| 329 if ( ! audio->enabled ) { | |
| 330 return; | |
| 331 } | |
| 332 memset (newbuf->dbSoundData, 0, audio->spec.size); | |
| 333 newbuf->dbNumFrames = audio->spec.samples; | |
| 334 if ( ! audio->paused ) { | |
| 335 if ( audio->convert.needed ) { | |
| 336 audio->spec.callback(audio->spec.userdata, | |
| 337 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 338 SDL_ConvertAudio(&audio->convert); | |
| 339 #if 0 | |
| 340 if ( audio->convert.len_cvt != audio->spec.size ) { | |
| 341 /* Uh oh... probably crashes here */; | |
| 342 } | |
| 343 #endif | |
| 344 memcpy(newbuf->dbSoundData, audio->convert.buf, | |
| 345 audio->convert.len_cvt); | |
| 346 } else { | |
| 347 audio->spec.callback(audio->spec.userdata, | |
| 348 (Uint8 *)newbuf->dbSoundData, audio->spec.size); | |
| 349 } | |
| 350 } | |
| 351 newbuf->dbFlags |= dbBufferReady; | |
| 352 } | |
| 353 | |
| 354 static int DoubleBufferAudio_Available(void) | |
| 355 { | |
| 356 int available; | |
| 357 NumVersion sndversion; | |
| 358 long response; | |
| 359 | |
| 360 available = 0; | |
| 361 sndversion = SndSoundManagerVersion(); | |
| 362 if ( sndversion.majorRev >= 3 ) { | |
| 363 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 364 if ( (response & (1 << gestaltSndPlayDoubleBuffer)) ) { | |
| 365 available = 1; | |
| 366 } | |
| 367 } | |
| 368 } else { | |
| 369 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 370 if ( (response & (1 << gestaltHasASC)) ) { | |
| 371 available = 1; | |
| 372 } | |
| 373 } | |
| 374 } | |
| 375 return(available); | |
| 376 } | |
| 377 | |
| 378 static void Mac_CloseAudio(_THIS) | |
| 379 { | |
| 380 int i; | |
| 381 | |
| 382 if ( channel != NULL ) { | |
| 383 /* Clean up the audio channel */ | |
| 384 SndDisposeChannel(channel, true); | |
| 385 channel = NULL; | |
| 386 } | |
| 387 for ( i=0; i<2; ++i ) { | |
| 388 if ( audio_buf[i] ) { | |
| 389 free(audio_buf[i]); | |
| 390 audio_buf[i] = NULL; | |
| 391 } | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 396 { | |
| 397 SndDoubleBufferHeader2 audio_dbh; | |
| 398 int i; | |
| 399 long initOptions; | |
| 400 int sample_bits; | |
| 401 SndDoubleBackUPP doubleBackProc; | |
| 402 | |
| 403 /* Check to make sure double-buffered audio is available */ | |
| 404 if ( ! DoubleBufferAudio_Available() ) { | |
| 405 SDL_SetError("Sound manager doesn't support double-buffering"); | |
| 406 return(-1); | |
| 407 } | |
| 408 | |
| 409 /* Very few conversions are required, but... */ | |
| 410 switch (spec->format) { | |
| 411 case AUDIO_S8: | |
| 412 spec->format = AUDIO_U8; | |
| 413 break; | |
| 414 case AUDIO_U16LSB: | |
| 415 spec->format = AUDIO_S16LSB; | |
| 416 break; | |
| 417 case AUDIO_U16MSB: | |
| 418 spec->format = AUDIO_S16MSB; | |
| 419 break; | |
| 420 } | |
| 421 SDL_CalculateAudioSpec(spec); | |
| 422 | |
| 423 /* initialize the double-back header */ | |
| 424 memset(&audio_dbh, 0, sizeof(audio_dbh)); | |
| 425 doubleBackProc = NewSndDoubleBackProc (sndDoubleBackProc); | |
| 426 sample_bits = spec->size / spec->samples / spec->channels * 8; | |
| 427 | |
| 428 audio_dbh.dbhNumChannels = spec->channels; | |
| 429 audio_dbh.dbhSampleSize = sample_bits; | |
| 430 audio_dbh.dbhCompressionID = 0; | |
| 431 audio_dbh.dbhPacketSize = 0; | |
| 432 audio_dbh.dbhSampleRate = spec->freq << 16; | |
| 433 audio_dbh.dbhDoubleBack = doubleBackProc; | |
| 434 audio_dbh.dbhFormat = 0; | |
| 435 | |
| 436 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 437 if ( spec->format == 0x8010 ) { | |
| 438 audio_dbh.dbhCompressionID = fixedCompression; | |
| 439 audio_dbh.dbhFormat = k16BitLittleEndianFormat; | |
| 440 } | |
| 441 | |
| 442 /* allocate the 2 double-back buffers */ | |
| 443 for ( i=0; i<2; ++i ) { | |
| 444 audio_buf[i] = calloc(1, sizeof(SndDoubleBuffer)+spec->size); | |
| 445 if ( audio_buf[i] == NULL ) { | |
| 446 SDL_OutOfMemory(); | |
| 447 return(-1); | |
| 448 } | |
| 449 audio_buf[i]->dbNumFrames = spec->samples; | |
| 450 audio_buf[i]->dbFlags = dbBufferReady; | |
| 451 audio_buf[i]->dbUserInfo[0] = (long)this; | |
| 452 audio_dbh.dbhBufferPtr[i] = audio_buf[i]; | |
| 453 } | |
| 454 | |
| 455 /* Create the sound manager channel */ | |
| 456 channel = (SndChannelPtr)malloc(sizeof(*channel)); | |
| 457 if ( channel == NULL ) { | |
| 458 SDL_OutOfMemory(); | |
| 459 return(-1); | |
| 460 } | |
| 461 if ( spec->channels >= 2 ) { | |
| 462 initOptions = initStereo; | |
| 463 } else { | |
| 464 initOptions = initMono; | |
| 465 } | |
| 466 channel->userInfo = 0; | |
| 467 channel->qLength = 128; | |
| 468 if ( SndNewChannel(&channel, sampledSynth, initOptions, 0L) != noErr ) { | |
| 469 SDL_SetError("Unable to create audio channel"); | |
| 470 free(channel); | |
| 471 channel = NULL; | |
| 472 return(-1); | |
| 473 } | |
| 474 | |
| 475 /* Start playback */ | |
| 476 if ( SndPlayDoubleBuffer(channel, (SndDoubleBufferHeaderPtr)&audio_dbh) | |
| 477 != noErr ) { | |
| 478 SDL_SetError("Unable to play double buffered audio"); | |
| 479 return(-1); | |
| 480 } | |
| 481 | |
| 482 return 1; | |
| 483 } | |
| 484 | |
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485 #endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */ |
| 0 | 486 |