1 /* 2 * QEMU SDL audio driver 3 * 4 * Copyright (c) 2004-2005 Vassili Karpov (malc) 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include <SDL.h> 27 #include <SDL_thread.h> 28 #include "qemu/module.h" 29 #include "audio.h" 30 31 #ifndef _WIN32 32 #ifdef __sun__ 33 #define _POSIX_PTHREAD_SEMANTICS 1 34 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) 35 #include <pthread.h> 36 #endif 37 #endif 38 39 #define AUDIO_CAP "sdl" 40 #include "audio_int.h" 41 42 typedef struct SDLVoiceOut { 43 HWVoiceOut hw; 44 int exit; 45 int initialized; 46 Audiodev *dev; 47 SDL_AudioDeviceID devid; 48 } SDLVoiceOut; 49 50 typedef struct SDLVoiceIn { 51 HWVoiceIn hw; 52 int exit; 53 int initialized; 54 Audiodev *dev; 55 SDL_AudioDeviceID devid; 56 } SDLVoiceIn; 57 58 static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...) 59 { 60 va_list ap; 61 62 va_start (ap, fmt); 63 AUD_vlog (AUDIO_CAP, fmt, ap); 64 va_end (ap); 65 66 AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ()); 67 } 68 69 static int aud_to_sdlfmt (AudioFormat fmt) 70 { 71 switch (fmt) { 72 case AUDIO_FORMAT_S8: 73 return AUDIO_S8; 74 75 case AUDIO_FORMAT_U8: 76 return AUDIO_U8; 77 78 case AUDIO_FORMAT_S16: 79 return AUDIO_S16LSB; 80 81 case AUDIO_FORMAT_U16: 82 return AUDIO_U16LSB; 83 84 case AUDIO_FORMAT_S32: 85 return AUDIO_S32LSB; 86 87 /* no unsigned 32-bit support in SDL */ 88 89 case AUDIO_FORMAT_F32: 90 return AUDIO_F32LSB; 91 92 default: 93 dolog ("Internal logic error: Bad audio format %d\n", fmt); 94 #ifdef DEBUG_AUDIO 95 abort (); 96 #endif 97 return AUDIO_U8; 98 } 99 } 100 101 static int sdl_to_audfmt(int sdlfmt, AudioFormat *fmt, int *endianness) 102 { 103 switch (sdlfmt) { 104 case AUDIO_S8: 105 *endianness = 0; 106 *fmt = AUDIO_FORMAT_S8; 107 break; 108 109 case AUDIO_U8: 110 *endianness = 0; 111 *fmt = AUDIO_FORMAT_U8; 112 break; 113 114 case AUDIO_S16LSB: 115 *endianness = 0; 116 *fmt = AUDIO_FORMAT_S16; 117 break; 118 119 case AUDIO_U16LSB: 120 *endianness = 0; 121 *fmt = AUDIO_FORMAT_U16; 122 break; 123 124 case AUDIO_S16MSB: 125 *endianness = 1; 126 *fmt = AUDIO_FORMAT_S16; 127 break; 128 129 case AUDIO_U16MSB: 130 *endianness = 1; 131 *fmt = AUDIO_FORMAT_U16; 132 break; 133 134 case AUDIO_S32LSB: 135 *endianness = 0; 136 *fmt = AUDIO_FORMAT_S32; 137 break; 138 139 case AUDIO_S32MSB: 140 *endianness = 1; 141 *fmt = AUDIO_FORMAT_S32; 142 break; 143 144 case AUDIO_F32LSB: 145 *endianness = 0; 146 *fmt = AUDIO_FORMAT_F32; 147 break; 148 149 case AUDIO_F32MSB: 150 *endianness = 1; 151 *fmt = AUDIO_FORMAT_F32; 152 break; 153 154 default: 155 dolog ("Unrecognized SDL audio format %d\n", sdlfmt); 156 return -1; 157 } 158 159 return 0; 160 } 161 162 static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt, 163 int rec) 164 { 165 SDL_AudioDeviceID devid; 166 #ifndef _WIN32 167 int err; 168 sigset_t new, old; 169 170 /* Make sure potential threads created by SDL don't hog signals. */ 171 err = sigfillset (&new); 172 if (err) { 173 dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno)); 174 return 0; 175 } 176 err = pthread_sigmask (SIG_BLOCK, &new, &old); 177 if (err) { 178 dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err)); 179 return 0; 180 } 181 #endif 182 183 devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0); 184 if (!devid) { 185 sdl_logerr("SDL_OpenAudioDevice for %s failed\n", 186 rec ? "recording" : "playback"); 187 } 188 189 #ifndef _WIN32 190 err = pthread_sigmask (SIG_SETMASK, &old, NULL); 191 if (err) { 192 dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n", 193 strerror (errno)); 194 /* We have failed to restore original signal mask, all bets are off, 195 so exit the process */ 196 exit (EXIT_FAILURE); 197 } 198 #endif 199 return devid; 200 } 201 202 static void sdl_close_out(SDLVoiceOut *sdl) 203 { 204 if (sdl->initialized) { 205 SDL_LockAudioDevice(sdl->devid); 206 sdl->exit = 1; 207 SDL_UnlockAudioDevice(sdl->devid); 208 SDL_PauseAudioDevice(sdl->devid, 1); 209 sdl->initialized = 0; 210 } 211 if (sdl->devid) { 212 SDL_CloseAudioDevice(sdl->devid); 213 sdl->devid = 0; 214 } 215 } 216 217 static void sdl_callback_out(void *opaque, Uint8 *buf, int len) 218 { 219 SDLVoiceOut *sdl = opaque; 220 HWVoiceOut *hw = &sdl->hw; 221 222 if (!sdl->exit) { 223 224 /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */ 225 226 while (hw->pending_emul && len) { 227 size_t write_len; 228 ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul; 229 if (start < 0) { 230 start += hw->size_emul; 231 } 232 assert(start >= 0 && start < hw->size_emul); 233 234 write_len = MIN(MIN(hw->pending_emul, len), 235 hw->size_emul - start); 236 237 memcpy(buf, hw->buf_emul + start, write_len); 238 hw->pending_emul -= write_len; 239 len -= write_len; 240 buf += write_len; 241 } 242 } 243 244 /* clear remaining buffer that we couldn't fill with data */ 245 if (len) { 246 audio_pcm_info_clear_buf(&hw->info, buf, 247 len / hw->info.bytes_per_frame); 248 } 249 } 250 251 static void sdl_close_in(SDLVoiceIn *sdl) 252 { 253 if (sdl->initialized) { 254 SDL_LockAudioDevice(sdl->devid); 255 sdl->exit = 1; 256 SDL_UnlockAudioDevice(sdl->devid); 257 SDL_PauseAudioDevice(sdl->devid, 1); 258 sdl->initialized = 0; 259 } 260 if (sdl->devid) { 261 SDL_CloseAudioDevice(sdl->devid); 262 sdl->devid = 0; 263 } 264 } 265 266 static void sdl_callback_in(void *opaque, Uint8 *buf, int len) 267 { 268 SDLVoiceIn *sdl = opaque; 269 HWVoiceIn *hw = &sdl->hw; 270 271 if (sdl->exit) { 272 return; 273 } 274 275 /* dolog("callback_in: len=%d pending=%zu\n", len, hw->pending_emul); */ 276 277 while (hw->pending_emul < hw->size_emul && len) { 278 size_t read_len = MIN(len, MIN(hw->size_emul - hw->pos_emul, 279 hw->size_emul - hw->pending_emul)); 280 281 memcpy(hw->buf_emul + hw->pos_emul, buf, read_len); 282 283 hw->pending_emul += read_len; 284 hw->pos_emul = (hw->pos_emul + read_len) % hw->size_emul; 285 len -= read_len; 286 buf += read_len; 287 } 288 } 289 290 #define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args, dir) \ 291 static ret_type glue(sdl_, name)args_decl \ 292 { \ 293 ret_type ret; \ 294 glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \ 295 \ 296 SDL_LockAudioDevice(sdl->devid); \ 297 ret = glue(audio_generic_, name)args; \ 298 SDL_UnlockAudioDevice(sdl->devid); \ 299 \ 300 return ret; \ 301 } 302 303 #define SDL_WRAPPER_VOID_FUNC(name, args_decl, args, dir) \ 304 static void glue(sdl_, name)args_decl \ 305 { \ 306 glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \ 307 \ 308 SDL_LockAudioDevice(sdl->devid); \ 309 glue(audio_generic_, name)args; \ 310 SDL_UnlockAudioDevice(sdl->devid); \ 311 } 312 313 SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size), 314 (hw, size), Out) 315 SDL_WRAPPER_FUNC(put_buffer_out, size_t, 316 (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out) 317 SDL_WRAPPER_FUNC(write, size_t, 318 (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out) 319 SDL_WRAPPER_FUNC(read, size_t, (HWVoiceIn *hw, void *buf, size_t size), 320 (hw, buf, size), In) 321 SDL_WRAPPER_FUNC(get_buffer_in, void *, (HWVoiceIn *hw, size_t *size), 322 (hw, size), In) 323 SDL_WRAPPER_VOID_FUNC(put_buffer_in, (HWVoiceIn *hw, void *buf, size_t size), 324 (hw, buf, size), In) 325 #undef SDL_WRAPPER_FUNC 326 #undef SDL_WRAPPER_VOID_FUNC 327 328 static void sdl_fini_out(HWVoiceOut *hw) 329 { 330 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 331 332 sdl_close_out(sdl); 333 } 334 335 static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as, 336 void *drv_opaque) 337 { 338 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 339 SDL_AudioSpec req, obt; 340 int endianness; 341 int err; 342 AudioFormat effective_fmt; 343 Audiodev *dev = drv_opaque; 344 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out; 345 struct audsettings obt_as; 346 347 req.freq = as->freq; 348 req.format = aud_to_sdlfmt (as->fmt); 349 req.channels = as->nchannels; 350 /* 351 * This is wrong. SDL samples are QEMU frames. The buffer size will be 352 * the requested buffer size multiplied by the number of channels. 353 */ 354 req.samples = audio_buffer_samples( 355 qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610); 356 req.callback = sdl_callback_out; 357 req.userdata = sdl; 358 359 sdl->dev = dev; 360 sdl->devid = sdl_open(&req, &obt, 0); 361 if (!sdl->devid) { 362 return -1; 363 } 364 365 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness); 366 if (err) { 367 sdl_close_out(sdl); 368 return -1; 369 } 370 371 obt_as.freq = obt.freq; 372 obt_as.nchannels = obt.channels; 373 obt_as.fmt = effective_fmt; 374 obt_as.endianness = endianness; 375 376 audio_pcm_init_info (&hw->info, &obt_as); 377 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) * 378 obt.samples; 379 380 sdl->initialized = 1; 381 sdl->exit = 0; 382 return 0; 383 } 384 385 static void sdl_enable_out(HWVoiceOut *hw, bool enable) 386 { 387 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 388 389 SDL_PauseAudioDevice(sdl->devid, !enable); 390 } 391 392 static void sdl_fini_in(HWVoiceIn *hw) 393 { 394 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 395 396 sdl_close_in(sdl); 397 } 398 399 static int sdl_init_in(HWVoiceIn *hw, audsettings *as, void *drv_opaque) 400 { 401 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 402 SDL_AudioSpec req, obt; 403 int endianness; 404 int err; 405 AudioFormat effective_fmt; 406 Audiodev *dev = drv_opaque; 407 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.in; 408 struct audsettings obt_as; 409 410 req.freq = as->freq; 411 req.format = aud_to_sdlfmt(as->fmt); 412 req.channels = as->nchannels; 413 /* SDL samples are QEMU frames */ 414 req.samples = audio_buffer_frames( 415 qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610); 416 req.callback = sdl_callback_in; 417 req.userdata = sdl; 418 419 sdl->dev = dev; 420 sdl->devid = sdl_open(&req, &obt, 1); 421 if (!sdl->devid) { 422 return -1; 423 } 424 425 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness); 426 if (err) { 427 sdl_close_in(sdl); 428 return -1; 429 } 430 431 obt_as.freq = obt.freq; 432 obt_as.nchannels = obt.channels; 433 obt_as.fmt = effective_fmt; 434 obt_as.endianness = endianness; 435 436 audio_pcm_init_info(&hw->info, &obt_as); 437 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) * 438 obt.samples; 439 hw->size_emul = hw->samples * hw->info.bytes_per_frame; 440 hw->buf_emul = g_malloc(hw->size_emul); 441 hw->pos_emul = hw->pending_emul = 0; 442 443 sdl->initialized = 1; 444 sdl->exit = 0; 445 return 0; 446 } 447 448 static void sdl_enable_in(HWVoiceIn *hw, bool enable) 449 { 450 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 451 452 SDL_PauseAudioDevice(sdl->devid, !enable); 453 } 454 455 static void *sdl_audio_init(Audiodev *dev) 456 { 457 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) { 458 sdl_logerr ("SDL failed to initialize audio subsystem\n"); 459 return NULL; 460 } 461 462 return dev; 463 } 464 465 static void sdl_audio_fini (void *opaque) 466 { 467 SDL_QuitSubSystem (SDL_INIT_AUDIO); 468 } 469 470 static struct audio_pcm_ops sdl_pcm_ops = { 471 .init_out = sdl_init_out, 472 .fini_out = sdl_fini_out, 473 /* wrapper for audio_generic_write */ 474 .write = sdl_write, 475 /* wrapper for audio_generic_get_buffer_out */ 476 .get_buffer_out = sdl_get_buffer_out, 477 /* wrapper for audio_generic_put_buffer_out */ 478 .put_buffer_out = sdl_put_buffer_out, 479 .enable_out = sdl_enable_out, 480 .init_in = sdl_init_in, 481 .fini_in = sdl_fini_in, 482 /* wrapper for audio_generic_read */ 483 .read = sdl_read, 484 /* wrapper for audio_generic_get_buffer_in */ 485 .get_buffer_in = sdl_get_buffer_in, 486 /* wrapper for audio_generic_put_buffer_in */ 487 .put_buffer_in = sdl_put_buffer_in, 488 .enable_in = sdl_enable_in, 489 }; 490 491 static struct audio_driver sdl_audio_driver = { 492 .name = "sdl", 493 .descr = "SDL http://www.libsdl.org", 494 .init = sdl_audio_init, 495 .fini = sdl_audio_fini, 496 .pcm_ops = &sdl_pcm_ops, 497 .can_be_default = 1, 498 .max_voices_out = INT_MAX, 499 .max_voices_in = INT_MAX, 500 .voice_size_out = sizeof(SDLVoiceOut), 501 .voice_size_in = sizeof(SDLVoiceIn), 502 }; 503 504 static void register_audio_sdl(void) 505 { 506 audio_driver_register(&sdl_audio_driver); 507 } 508 type_init(register_audio_sdl); 509