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 "qapi/error.h" 30 #include "audio.h" 31 32 #ifndef _WIN32 33 #ifdef __sun__ 34 #define _POSIX_PTHREAD_SEMANTICS 1 35 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__) 36 #include <pthread.h> 37 #endif 38 #endif 39 40 #define AUDIO_CAP "sdl" 41 #include "audio_int.h" 42 43 typedef struct SDLVoiceOut { 44 HWVoiceOut hw; 45 int exit; 46 int initialized; 47 Audiodev *dev; 48 SDL_AudioDeviceID devid; 49 } SDLVoiceOut; 50 51 typedef struct SDLVoiceIn { 52 HWVoiceIn hw; 53 int exit; 54 int initialized; 55 Audiodev *dev; 56 SDL_AudioDeviceID devid; 57 } SDLVoiceIn; 58 59 static void G_GNUC_PRINTF (1, 2) sdl_logerr (const char *fmt, ...) 60 { 61 va_list ap; 62 63 va_start (ap, fmt); 64 AUD_vlog (AUDIO_CAP, fmt, ap); 65 va_end (ap); 66 67 AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ()); 68 } 69 70 static int aud_to_sdlfmt (AudioFormat fmt) 71 { 72 switch (fmt) { 73 case AUDIO_FORMAT_S8: 74 return AUDIO_S8; 75 76 case AUDIO_FORMAT_U8: 77 return AUDIO_U8; 78 79 case AUDIO_FORMAT_S16: 80 return AUDIO_S16LSB; 81 82 case AUDIO_FORMAT_U16: 83 return AUDIO_U16LSB; 84 85 case AUDIO_FORMAT_S32: 86 return AUDIO_S32LSB; 87 88 /* no unsigned 32-bit support in SDL */ 89 90 case AUDIO_FORMAT_F32: 91 return AUDIO_F32LSB; 92 93 default: 94 dolog ("Internal logic error: Bad audio format %d\n", fmt); 95 #ifdef DEBUG_AUDIO 96 abort (); 97 #endif 98 return AUDIO_U8; 99 } 100 } 101 102 static int sdl_to_audfmt(int sdlfmt, AudioFormat *fmt, int *endianness) 103 { 104 switch (sdlfmt) { 105 case AUDIO_S8: 106 *endianness = 0; 107 *fmt = AUDIO_FORMAT_S8; 108 break; 109 110 case AUDIO_U8: 111 *endianness = 0; 112 *fmt = AUDIO_FORMAT_U8; 113 break; 114 115 case AUDIO_S16LSB: 116 *endianness = 0; 117 *fmt = AUDIO_FORMAT_S16; 118 break; 119 120 case AUDIO_U16LSB: 121 *endianness = 0; 122 *fmt = AUDIO_FORMAT_U16; 123 break; 124 125 case AUDIO_S16MSB: 126 *endianness = 1; 127 *fmt = AUDIO_FORMAT_S16; 128 break; 129 130 case AUDIO_U16MSB: 131 *endianness = 1; 132 *fmt = AUDIO_FORMAT_U16; 133 break; 134 135 case AUDIO_S32LSB: 136 *endianness = 0; 137 *fmt = AUDIO_FORMAT_S32; 138 break; 139 140 case AUDIO_S32MSB: 141 *endianness = 1; 142 *fmt = AUDIO_FORMAT_S32; 143 break; 144 145 case AUDIO_F32LSB: 146 *endianness = 0; 147 *fmt = AUDIO_FORMAT_F32; 148 break; 149 150 case AUDIO_F32MSB: 151 *endianness = 1; 152 *fmt = AUDIO_FORMAT_F32; 153 break; 154 155 default: 156 dolog ("Unrecognized SDL audio format %d\n", sdlfmt); 157 return -1; 158 } 159 160 return 0; 161 } 162 163 static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt, 164 int rec) 165 { 166 SDL_AudioDeviceID devid; 167 #ifndef _WIN32 168 int err; 169 sigset_t new, old; 170 171 /* Make sure potential threads created by SDL don't hog signals. */ 172 err = sigfillset (&new); 173 if (err) { 174 dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno)); 175 return 0; 176 } 177 err = pthread_sigmask (SIG_BLOCK, &new, &old); 178 if (err) { 179 dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err)); 180 return 0; 181 } 182 #endif 183 184 devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0); 185 if (!devid) { 186 sdl_logerr("SDL_OpenAudioDevice for %s failed\n", 187 rec ? "recording" : "playback"); 188 } 189 190 #ifndef _WIN32 191 err = pthread_sigmask (SIG_SETMASK, &old, NULL); 192 if (err) { 193 dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n", 194 strerror (errno)); 195 /* We have failed to restore original signal mask, all bets are off, 196 so exit the process */ 197 exit (EXIT_FAILURE); 198 } 199 #endif 200 return devid; 201 } 202 203 static void sdl_close_out(SDLVoiceOut *sdl) 204 { 205 if (sdl->initialized) { 206 SDL_LockAudioDevice(sdl->devid); 207 sdl->exit = 1; 208 SDL_UnlockAudioDevice(sdl->devid); 209 SDL_PauseAudioDevice(sdl->devid, 1); 210 sdl->initialized = 0; 211 } 212 if (sdl->devid) { 213 SDL_CloseAudioDevice(sdl->devid); 214 sdl->devid = 0; 215 } 216 } 217 218 static void sdl_callback_out(void *opaque, Uint8 *buf, int len) 219 { 220 SDLVoiceOut *sdl = opaque; 221 HWVoiceOut *hw = &sdl->hw; 222 223 if (!sdl->exit) { 224 225 /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */ 226 227 while (hw->pending_emul && len) { 228 size_t write_len, start; 229 230 start = audio_ring_posb(hw->pos_emul, hw->pending_emul, 231 hw->size_emul); 232 assert(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(buffer_get_free, size_t, (HWVoiceOut *hw), (hw), Out) 314 SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size), 315 (hw, size), Out) 316 SDL_WRAPPER_FUNC(put_buffer_out, size_t, 317 (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out) 318 SDL_WRAPPER_FUNC(write, size_t, 319 (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out) 320 SDL_WRAPPER_FUNC(read, size_t, (HWVoiceIn *hw, void *buf, size_t size), 321 (hw, buf, size), In) 322 SDL_WRAPPER_FUNC(get_buffer_in, void *, (HWVoiceIn *hw, size_t *size), 323 (hw, size), In) 324 SDL_WRAPPER_VOID_FUNC(put_buffer_in, (HWVoiceIn *hw, void *buf, size_t size), 325 (hw, buf, size), In) 326 #undef SDL_WRAPPER_FUNC 327 #undef SDL_WRAPPER_VOID_FUNC 328 329 static void sdl_fini_out(HWVoiceOut *hw) 330 { 331 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 332 333 sdl_close_out(sdl); 334 } 335 336 static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as, 337 void *drv_opaque) 338 { 339 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 340 SDL_AudioSpec req, obt; 341 int endianness; 342 int err; 343 AudioFormat effective_fmt; 344 Audiodev *dev = drv_opaque; 345 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out; 346 struct audsettings obt_as; 347 348 req.freq = as->freq; 349 req.format = aud_to_sdlfmt (as->fmt); 350 req.channels = as->nchannels; 351 /* SDL samples are QEMU frames */ 352 req.samples = audio_buffer_frames( 353 qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610); 354 req.callback = sdl_callback_out; 355 req.userdata = sdl; 356 357 sdl->dev = dev; 358 sdl->devid = sdl_open(&req, &obt, 0); 359 if (!sdl->devid) { 360 return -1; 361 } 362 363 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness); 364 if (err) { 365 sdl_close_out(sdl); 366 return -1; 367 } 368 369 obt_as.freq = obt.freq; 370 obt_as.nchannels = obt.channels; 371 obt_as.fmt = effective_fmt; 372 obt_as.endianness = endianness; 373 374 audio_pcm_init_info (&hw->info, &obt_as); 375 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) * 376 obt.samples; 377 378 sdl->initialized = 1; 379 sdl->exit = 0; 380 return 0; 381 } 382 383 static void sdl_enable_out(HWVoiceOut *hw, bool enable) 384 { 385 SDLVoiceOut *sdl = (SDLVoiceOut *)hw; 386 387 SDL_PauseAudioDevice(sdl->devid, !enable); 388 } 389 390 static void sdl_fini_in(HWVoiceIn *hw) 391 { 392 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 393 394 sdl_close_in(sdl); 395 } 396 397 static int sdl_init_in(HWVoiceIn *hw, audsettings *as, void *drv_opaque) 398 { 399 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 400 SDL_AudioSpec req, obt; 401 int endianness; 402 int err; 403 AudioFormat effective_fmt; 404 Audiodev *dev = drv_opaque; 405 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.in; 406 struct audsettings obt_as; 407 408 req.freq = as->freq; 409 req.format = aud_to_sdlfmt(as->fmt); 410 req.channels = as->nchannels; 411 /* SDL samples are QEMU frames */ 412 req.samples = audio_buffer_frames( 413 qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610); 414 req.callback = sdl_callback_in; 415 req.userdata = sdl; 416 417 sdl->dev = dev; 418 sdl->devid = sdl_open(&req, &obt, 1); 419 if (!sdl->devid) { 420 return -1; 421 } 422 423 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness); 424 if (err) { 425 sdl_close_in(sdl); 426 return -1; 427 } 428 429 obt_as.freq = obt.freq; 430 obt_as.nchannels = obt.channels; 431 obt_as.fmt = effective_fmt; 432 obt_as.endianness = endianness; 433 434 audio_pcm_init_info(&hw->info, &obt_as); 435 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) * 436 obt.samples; 437 hw->size_emul = hw->samples * hw->info.bytes_per_frame; 438 hw->buf_emul = g_malloc(hw->size_emul); 439 hw->pos_emul = hw->pending_emul = 0; 440 441 sdl->initialized = 1; 442 sdl->exit = 0; 443 return 0; 444 } 445 446 static void sdl_enable_in(HWVoiceIn *hw, bool enable) 447 { 448 SDLVoiceIn *sdl = (SDLVoiceIn *)hw; 449 450 SDL_PauseAudioDevice(sdl->devid, !enable); 451 } 452 453 static void *sdl_audio_init(Audiodev *dev, Error **errp) 454 { 455 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) { 456 error_setg(errp, "SDL failed to initialize audio subsystem"); 457 return NULL; 458 } 459 460 return dev; 461 } 462 463 static void sdl_audio_fini (void *opaque) 464 { 465 SDL_QuitSubSystem (SDL_INIT_AUDIO); 466 } 467 468 static struct audio_pcm_ops sdl_pcm_ops = { 469 .init_out = sdl_init_out, 470 .fini_out = sdl_fini_out, 471 /* wrapper for audio_generic_write */ 472 .write = sdl_write, 473 /* wrapper for audio_generic_buffer_get_free */ 474 .buffer_get_free = sdl_buffer_get_free, 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 .max_voices_out = INT_MAX, 498 .max_voices_in = INT_MAX, 499 .voice_size_out = sizeof(SDLVoiceOut), 500 .voice_size_in = sizeof(SDLVoiceIn), 501 }; 502 503 static void register_audio_sdl(void) 504 { 505 audio_driver_register(&sdl_audio_driver); 506 } 507 type_init(register_audio_sdl); 508