audio/coreaudio.c

   1 /*
   2  * QEMU OS X CoreAudio audio driver
   3  *
   4  * Copyright (c) 2005 Mike Kronenberg
   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 <CoreAudio/CoreAudio.h>
  27 #include <pthread.h>            /* pthread_X */
  28
  29 #include "qemu-common.h"
  30 #include "audio.h"
  31
  32 #define AUDIO_CAP "coreaudio"
  33 #include "audio_int.h"
  34
  35 #ifndef MAC_OS_X_VERSION_10_6
  36 #define MAC_OS_X_VERSION_10_6 1060
  37 #endif
  38
  39 static int isAtexit;
  40
  41 typedef struct {
  42     int buffer_frames;
  43     int nbuffers;
  44 } CoreaudioConf;
  45
  46 typedef struct coreaudioVoiceOut {
  47     HWVoiceOut hw;
  48     pthread_mutex_t mutex;
  49     AudioDeviceID outputDeviceID;
  50     UInt32 audioDevicePropertyBufferFrameSize;
  51     AudioStreamBasicDescription outputStreamBasicDescription;
  52     AudioDeviceIOProcID ioprocid;
  53     int live;
  54     int decr;
  55     int rpos;
  56 } coreaudioVoiceOut;
  57
  58 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  59 /* The APIs used here only become available from 10.6 */
  60
  61 static OSStatus coreaudio_get_voice(AudioDeviceID *id)
  62 {
  63     UInt32 size = sizeof(*id);
  64     AudioObjectPropertyAddress addr = {
  65         kAudioHardwarePropertyDefaultOutputDevice,
  66         kAudioObjectPropertyScopeGlobal,
  67         kAudioObjectPropertyElementMaster
  68     };
  69
  70     return AudioObjectGetPropertyData(kAudioObjectSystemObject,
  71                                       &addr,
  72                                       0,
  73                                       NULL,
  74                                       &size,
  75                                       id);
  76 }
  77
  78 static OSStatus coreaudio_get_framesizerange(AudioDeviceID id,
  79                                              AudioValueRange *framerange)
  80 {
  81     UInt32 size = sizeof(*framerange);
  82     AudioObjectPropertyAddress addr = {
  83         kAudioDevicePropertyBufferFrameSizeRange,
  84         kAudioDevicePropertyScopeOutput,
  85         kAudioObjectPropertyElementMaster
  86     };
  87
  88     return AudioObjectGetPropertyData(id,
  89                                       &addr,
  90                                       0,
  91                                       NULL,
  92                                       &size,
  93                                       framerange);
  94 }
  95
  96 static OSStatus coreaudio_get_framesize(AudioDeviceID id, UInt32 *framesize)
  97 {
  98     UInt32 size = sizeof(*framesize);
  99     AudioObjectPropertyAddress addr = {
 100         kAudioDevicePropertyBufferFrameSize,
 101         kAudioDevicePropertyScopeOutput,
 102         kAudioObjectPropertyElementMaster
 103     };
 104
 105     return AudioObjectGetPropertyData(id,
 106                                       &addr,
 107                                       0,
 108                                       NULL,
 109                                       &size,
 110                                       framesize);
 111 }
 112
 113 static OSStatus coreaudio_set_framesize(AudioDeviceID id, UInt32 *framesize)
 114 {
 115     UInt32 size = sizeof(*framesize);
 116     AudioObjectPropertyAddress addr = {
 117         kAudioDevicePropertyBufferFrameSize,
 118         kAudioDevicePropertyScopeOutput,
 119         kAudioObjectPropertyElementMaster
 120     };
 121
 122     return AudioObjectSetPropertyData(id,
 123                                       &addr,
 124                                       0,
 125                                       NULL,
 126                                       size,
 127                                       framesize);
 128 }
 129
 130 static OSStatus coreaudio_get_streamformat(AudioDeviceID id,
 131                                            AudioStreamBasicDescription *d)
 132 {
 133     UInt32 size = sizeof(*d);
 134     AudioObjectPropertyAddress addr = {
 135         kAudioDevicePropertyStreamFormat,
 136         kAudioDevicePropertyScopeOutput,
 137         kAudioObjectPropertyElementMaster
 138     };
 139
 140     return AudioObjectGetPropertyData(id,
 141                                       &addr,
 142                                       0,
 143                                       NULL,
 144                                       &size,
 145                                       d);
 146 }
 147
 148 static OSStatus coreaudio_set_streamformat(AudioDeviceID id,
 149                                            AudioStreamBasicDescription *d)
 150 {
 151     UInt32 size = sizeof(*d);
 152     AudioObjectPropertyAddress addr = {
 153         kAudioDevicePropertyStreamFormat,
 154         kAudioDevicePropertyScopeOutput,
 155         kAudioObjectPropertyElementMaster
 156     };
 157
 158     return AudioObjectSetPropertyData(id,
 159                                       &addr,
 160                                       0,
 161                                       NULL,
 162                                       size,
 163                                       d);
 164 }
 165
 166 static OSStatus coreaudio_get_isrunning(AudioDeviceID id, UInt32 *result)
 167 {
 168     UInt32 size = sizeof(*result);
 169     AudioObjectPropertyAddress addr = {
 170         kAudioDevicePropertyDeviceIsRunning,
 171         kAudioDevicePropertyScopeOutput,
 172         kAudioObjectPropertyElementMaster
 173     };
 174
 175     return AudioObjectGetPropertyData(id,
 176                                       &addr,
 177                                       0,
 178                                       NULL,
 179                                       &size,
 180                                       result);
 181 }
 182 #else
 183 /* Legacy versions of functions using deprecated APIs */
 184
 185 static OSStatus coreaudio_get_voice(AudioDeviceID *id)
 186 {
 187     UInt32 size = sizeof(*id);
 188
 189     return AudioHardwareGetProperty(
 190         kAudioHardwarePropertyDefaultOutputDevice,
 191         &size,
 192         id);
 193 }
 194
 195 static OSStatus coreaudio_get_framesizerange(AudioDeviceID id,
 196                                              AudioValueRange *framerange)
 197 {
 198     UInt32 size = sizeof(*framerange);
 199
 200     return AudioDeviceGetProperty(
 201         id,
 202         0,
 203         0,
 204         kAudioDevicePropertyBufferFrameSizeRange,
 205         &size,
 206         framerange);
 207 }
 208
 209 static OSStatus coreaudio_get_framesize(AudioDeviceID id, UInt32 *framesize)
 210 {
 211     UInt32 size = sizeof(*framesize);
 212
 213     return AudioDeviceGetProperty(
 214         id,
 215         0,
 216         false,
 217         kAudioDevicePropertyBufferFrameSize,
 218         &size,
 219         framesize);
 220 }
 221
 222 static OSStatus coreaudio_set_framesize(AudioDeviceID id, UInt32 *framesize)
 223 {
 224     UInt32 size = sizeof(*framesize);
 225
 226     return AudioDeviceSetProperty(
 227         id,
 228         NULL,
 229         0,
 230         false,
 231         kAudioDevicePropertyBufferFrameSize,
 232         size,
 233         framesize);
 234 }
 235
 236 static OSStatus coreaudio_get_streamformat(AudioDeviceID id,
 237                                            AudioStreamBasicDescription *d)
 238 {
 239     UInt32 size = sizeof(*d);
 240
 241     return AudioDeviceGetProperty(
 242         id,
 243         0,
 244         false,
 245         kAudioDevicePropertyStreamFormat,
 246         &size,
 247         d);
 248 }
 249
 250 static OSStatus coreaudio_set_streamformat(AudioDeviceID id,
 251                                            AudioStreamBasicDescription *d)
 252 {
 253     UInt32 size = sizeof(*d);
 254
 255     return AudioDeviceSetProperty(
 256         id,
 257         0,
 258         0,
 259         0,
 260         kAudioDevicePropertyStreamFormat,
 261         size,
 262         d);
 263 }
 264
 265 static OSStatus coreaudio_get_isrunning(AudioDeviceID id, UInt32 *result)
 266 {
 267     UInt32 size = sizeof(*result);
 268
 269     return AudioDeviceGetProperty(
 270         id,
 271         0,
 272         0,
 273         kAudioDevicePropertyDeviceIsRunning,
 274         &size,
 275         result);
 276 }
 277 #endif
 278
 279 static void coreaudio_logstatus (OSStatus status)
 280 {
 281     const char *str = "BUG";
 282
 283     switch(status) {
 284     case kAudioHardwareNoError:
 285         str = "kAudioHardwareNoError";
 286         break;
 287
 288     case kAudioHardwareNotRunningError:
 289         str = "kAudioHardwareNotRunningError";
 290         break;
 291
 292     case kAudioHardwareUnspecifiedError:
 293         str = "kAudioHardwareUnspecifiedError";
 294         break;
 295
 296     case kAudioHardwareUnknownPropertyError:
 297         str = "kAudioHardwareUnknownPropertyError";
 298         break;
 299
 300     case kAudioHardwareBadPropertySizeError:
 301         str = "kAudioHardwareBadPropertySizeError";
 302         break;
 303
 304     case kAudioHardwareIllegalOperationError:
 305         str = "kAudioHardwareIllegalOperationError";
 306         break;
 307
 308     case kAudioHardwareBadDeviceError:
 309         str = "kAudioHardwareBadDeviceError";
 310         break;
 311
 312     case kAudioHardwareBadStreamError:
 313         str = "kAudioHardwareBadStreamError";
 314         break;
 315
 316     case kAudioHardwareUnsupportedOperationError:
 317         str = "kAudioHardwareUnsupportedOperationError";
 318         break;
 319
 320     case kAudioDeviceUnsupportedFormatError:
 321         str = "kAudioDeviceUnsupportedFormatError";
 322         break;
 323
 324     case kAudioDevicePermissionsError:
 325         str = "kAudioDevicePermissionsError";
 326         break;
 327
 328     default:
 329         AUD_log (AUDIO_CAP, "Reason: status code %" PRId32 "\n", (int32_t)status);
 330         return;
 331     }
 332
 333     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 334 }
 335
 336 static void GCC_FMT_ATTR (2, 3) coreaudio_logerr (
 337     OSStatus status,
 338     const char *fmt,
 339     ...
 340     )
 341 {
 342     va_list ap;
 343
 344     va_start (ap, fmt);
 345     AUD_log (AUDIO_CAP, fmt, ap);
 346     va_end (ap);
 347
 348     coreaudio_logstatus (status);
 349 }
 350
 351 static void GCC_FMT_ATTR (3, 4) coreaudio_logerr2 (
 352     OSStatus status,
 353     const char *typ,
 354     const char *fmt,
 355     ...
 356     )
 357 {
 358     va_list ap;
 359
 360     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 361
 362     va_start (ap, fmt);
 363     AUD_vlog (AUDIO_CAP, fmt, ap);
 364     va_end (ap);
 365
 366     coreaudio_logstatus (status);
 367 }
 368
 369 static inline UInt32 isPlaying (AudioDeviceID outputDeviceID)
 370 {
 371     OSStatus status;
 372     UInt32 result = 0;
 373     status = coreaudio_get_isrunning(outputDeviceID, &result);
 374     if (status != kAudioHardwareNoError) {
 375         coreaudio_logerr(status,
 376                          "Could not determine whether Device is playing\n");
 377     }
 378     return result;
 379 }
 380
 381 static void coreaudio_atexit (void)
 382 {
 383     isAtexit = 1;
 384 }
 385
 386 static int coreaudio_lock (coreaudioVoiceOut *core, const char *fn_name)
 387 {
 388     int err;
 389
 390     err = pthread_mutex_lock (&core->mutex);
 391     if (err) {
 392         dolog ("Could not lock voice for %s\nReason: %s\n",
 393                fn_name, strerror (err));
 394         return -1;
 395     }
 396     return 0;
 397 }
 398
 399 static int coreaudio_unlock (coreaudioVoiceOut *core, const char *fn_name)
 400 {
 401     int err;
 402
 403     err = pthread_mutex_unlock (&core->mutex);
 404     if (err) {
 405         dolog ("Could not unlock voice for %s\nReason: %s\n",
 406                fn_name, strerror (err));
 407         return -1;
 408     }
 409     return 0;
 410 }
 411
 412 static int coreaudio_run_out (HWVoiceOut *hw, int live)
 413 {
 414     int decr;
 415     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;
 416
 417     if (coreaudio_lock (core, "coreaudio_run_out")) {
 418         return 0;
 419     }
 420
 421     if (core->decr > live) {
 422         ldebug ("core->decr %d live %d core->live %d\n",
 423                 core->decr,
 424                 live,
 425                 core->live);
 426     }
 427
 428     decr = audio_MIN (core->decr, live);
 429     core->decr -= decr;
 430
 431     core->live = live - decr;
 432     hw->rpos = core->rpos;
 433
 434     coreaudio_unlock (core, "coreaudio_run_out");
 435     return decr;
 436 }
 437
 438 /* callback to feed audiooutput buffer */
 439 static OSStatus audioDeviceIOProc(
 440     AudioDeviceID inDevice,
 441     const AudioTimeStamp* inNow,
 442     const AudioBufferList* inInputData,
 443     const AudioTimeStamp* inInputTime,
 444     AudioBufferList* outOutputData,
 445     const AudioTimeStamp* inOutputTime,
 446     void* hwptr)
 447 {
 448     UInt32 frame, frameCount;
 449     float *out = outOutputData->mBuffers[0].mData;
 450     HWVoiceOut *hw = hwptr;
 451     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hwptr;
 452     int rpos, live;
 453     struct st_sample *src;
 454 #ifndef FLOAT_MIXENG
 455 #ifdef RECIPROCAL
 456     const float scale = 1.f / UINT_MAX;
 457 #else
 458     const float scale = UINT_MAX;
 459 #endif
 460 #endif
 461
 462     if (coreaudio_lock (core, "audioDeviceIOProc")) {
 463         inInputTime = 0;
 464         return 0;
 465     }
 466
 467     frameCount = core->audioDevicePropertyBufferFrameSize;
 468     live = core->live;
 469
 470     /* if there are not enough samples, set signal and return */
 471     if (live < frameCount) {
 472         inInputTime = 0;
 473         coreaudio_unlock (core, "audioDeviceIOProc(empty)");
 474         return 0;
 475     }
 476
 477     rpos = core->rpos;
 478     src = hw->mix_buf + rpos;
 479
 480     /* fill buffer */
 481     for (frame = 0; frame < frameCount; frame++) {
 482 #ifdef FLOAT_MIXENG
 483         *out++ = src[frame].l; /* left channel */
 484         *out++ = src[frame].r; /* right channel */
 485 #else
 486 #ifdef RECIPROCAL
 487         *out++ = src[frame].l * scale; /* left channel */
 488         *out++ = src[frame].r * scale; /* right channel */
 489 #else
 490         *out++ = src[frame].l / scale; /* left channel */
 491         *out++ = src[frame].r / scale; /* right channel */
 492 #endif
 493 #endif
 494     }
 495
 496     rpos = (rpos + frameCount) % hw->samples;
 497     core->decr += frameCount;
 498     core->rpos = rpos;
 499
 500     coreaudio_unlock (core, "audioDeviceIOProc");
 501     return 0;
 502 }
 503
 504 static int coreaudio_write (SWVoiceOut *sw, void *buf, int len)
 505 {
 506     return audio_pcm_sw_write (sw, buf, len);
 507 }
 508
 509 static int coreaudio_init_out(HWVoiceOut *hw, struct audsettings *as,
 510                               void *drv_opaque)
 511 {
 512     OSStatus status;
 513     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;
 514     int err;
 515     const char *typ = "playback";
 516     AudioValueRange frameRange;
 517     CoreaudioConf *conf = drv_opaque;
 518
 519     /* create mutex */
 520     err = pthread_mutex_init(&core->mutex, NULL);
 521     if (err) {
 522         dolog("Could not create mutex\nReason: %s\n", strerror (err));
 523         return -1;
 524     }
 525
 526     audio_pcm_init_info (&hw->info, as);
 527
 528     status = coreaudio_get_voice(&core->outputDeviceID);
 529     if (status != kAudioHardwareNoError) {
 530         coreaudio_logerr2 (status, typ,
 531                            "Could not get default output Device\n");
 532         return -1;
 533     }
 534     if (core->outputDeviceID == kAudioDeviceUnknown) {
 535         dolog ("Could not initialize %s - Unknown Audiodevice\n", typ);
 536         return -1;
 537     }
 538
 539     /* get minimum and maximum buffer frame sizes */
 540     status = coreaudio_get_framesizerange(core->outputDeviceID,
 541                                           &frameRange);
 542     if (status != kAudioHardwareNoError) {
 543         coreaudio_logerr2 (status, typ,
 544                            "Could not get device buffer frame range\n");
 545         return -1;
 546     }
 547
 548     if (frameRange.mMinimum > conf->buffer_frames) {
 549         core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMinimum;
 550         dolog ("warning: Upsizing Buffer Frames to %f\n", frameRange.mMinimum);
 551     }
 552     else if (frameRange.mMaximum < conf->buffer_frames) {
 553         core->audioDevicePropertyBufferFrameSize = (UInt32) frameRange.mMaximum;
 554         dolog ("warning: Downsizing Buffer Frames to %f\n", frameRange.mMaximum);
 555     }
 556     else {
 557         core->audioDevicePropertyBufferFrameSize = conf->buffer_frames;
 558     }
 559
 560     /* set Buffer Frame Size */
 561     status = coreaudio_set_framesize(core->outputDeviceID,
 562                                      &core->audioDevicePropertyBufferFrameSize);
 563     if (status != kAudioHardwareNoError) {
 564         coreaudio_logerr2 (status, typ,
 565                            "Could not set device buffer frame size %" PRIu32 "\n",
 566                            (uint32_t)core->audioDevicePropertyBufferFrameSize);
 567         return -1;
 568     }
 569
 570     /* get Buffer Frame Size */
 571     status = coreaudio_get_framesize(core->outputDeviceID,
 572                                      &core->audioDevicePropertyBufferFrameSize);
 573     if (status != kAudioHardwareNoError) {
 574         coreaudio_logerr2 (status, typ,
 575                            "Could not get device buffer frame size\n");
 576         return -1;
 577     }
 578     hw->samples = conf->nbuffers * core->audioDevicePropertyBufferFrameSize;
 579
 580     /* get StreamFormat */
 581     status = coreaudio_get_streamformat(core->outputDeviceID,
 582                                         &core->outputStreamBasicDescription);
 583     if (status != kAudioHardwareNoError) {
 584         coreaudio_logerr2 (status, typ,
 585                            "Could not get Device Stream properties\n");
 586         core->outputDeviceID = kAudioDeviceUnknown;
 587         return -1;
 588     }
 589
 590     /* set Samplerate */
 591     core->outputStreamBasicDescription.mSampleRate = (Float64) as->freq;
 592     status = coreaudio_set_streamformat(core->outputDeviceID,
 593                                         &core->outputStreamBasicDescription);
 594     if (status != kAudioHardwareNoError) {
 595         coreaudio_logerr2 (status, typ, "Could not set samplerate %d\n",
 596                            as->freq);
 597         core->outputDeviceID = kAudioDeviceUnknown;
 598         return -1;
 599     }
 600
 601     /* set Callback */
 602     core->ioprocid = NULL;
 603     status = AudioDeviceCreateIOProcID(core->outputDeviceID,
 604                                        audioDeviceIOProc,
 605                                        hw,
 606                                        &core->ioprocid);
 607     if (status != kAudioHardwareNoError || core->ioprocid == NULL) {
 608         coreaudio_logerr2 (status, typ, "Could not set IOProc\n");
 609         core->outputDeviceID = kAudioDeviceUnknown;
 610         return -1;
 611     }
 612
 613     /* start Playback */
 614     if (!isPlaying(core->outputDeviceID)) {
 615         status = AudioDeviceStart(core->outputDeviceID, core->ioprocid);
 616         if (status != kAudioHardwareNoError) {
 617             coreaudio_logerr2 (status, typ, "Could not start playback\n");
 618             AudioDeviceDestroyIOProcID(core->outputDeviceID, core->ioprocid);
 619             core->outputDeviceID = kAudioDeviceUnknown;
 620             return -1;
 621         }
 622     }
 623
 624     return 0;
 625 }
 626
 627 static void coreaudio_fini_out (HWVoiceOut *hw)
 628 {
 629     OSStatus status;
 630     int err;
 631     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;
 632
 633     if (!isAtexit) {
 634         /* stop playback */
 635         if (isPlaying(core->outputDeviceID)) {
 636             status = AudioDeviceStop(core->outputDeviceID, core->ioprocid);
 637             if (status != kAudioHardwareNoError) {
 638                 coreaudio_logerr (status, "Could not stop playback\n");
 639             }
 640         }
 641
 642         /* remove callback */
 643         status = AudioDeviceDestroyIOProcID(core->outputDeviceID,
 644                                             core->ioprocid);
 645         if (status != kAudioHardwareNoError) {
 646             coreaudio_logerr (status, "Could not remove IOProc\n");
 647         }
 648     }
 649     core->outputDeviceID = kAudioDeviceUnknown;
 650
 651     /* destroy mutex */
 652     err = pthread_mutex_destroy(&core->mutex);
 653     if (err) {
 654         dolog("Could not destroy mutex\nReason: %s\n", strerror (err));
 655     }
 656 }
 657
 658 static int coreaudio_ctl_out (HWVoiceOut *hw, int cmd, ...)
 659 {
 660     OSStatus status;
 661     coreaudioVoiceOut *core = (coreaudioVoiceOut *) hw;
 662
 663     switch (cmd) {
 664     case VOICE_ENABLE:
 665         /* start playback */
 666         if (!isPlaying(core->outputDeviceID)) {
 667             status = AudioDeviceStart(core->outputDeviceID, core->ioprocid);
 668             if (status != kAudioHardwareNoError) {
 669                 coreaudio_logerr (status, "Could not resume playback\n");
 670             }
 671         }
 672         break;
 673
 674     case VOICE_DISABLE:
 675         /* stop playback */
 676         if (!isAtexit) {
 677             if (isPlaying(core->outputDeviceID)) {
 678                 status = AudioDeviceStop(core->outputDeviceID,
 679                                          core->ioprocid);
 680                 if (status != kAudioHardwareNoError) {
 681                     coreaudio_logerr (status, "Could not pause playback\n");
 682                 }
 683             }
 684         }
 685         break;
 686     }
 687     return 0;
 688 }
 689
 690 static CoreaudioConf glob_conf = {
 691     .buffer_frames = 512,
 692     .nbuffers = 4,
 693 };
 694
 695 static void *coreaudio_audio_init (void)
 696 {
 697     CoreaudioConf *conf = g_malloc(sizeof(CoreaudioConf));
 698     *conf = glob_conf;
 699
 700     atexit(coreaudio_atexit);
 701     return conf;
 702 }
 703
 704 static void coreaudio_audio_fini (void *opaque)
 705 {
 706     g_free(opaque);
 707 }
 708
 709 static struct audio_option coreaudio_options[] = {
 710     {
 711         .name  = "BUFFER_SIZE",
 712         .tag   = AUD_OPT_INT,
 713         .valp  = &glob_conf.buffer_frames,
 714         .descr = "Size of the buffer in frames"
 715     },
 716     {
 717         .name  = "BUFFER_COUNT",
 718         .tag   = AUD_OPT_INT,
 719         .valp  = &glob_conf.nbuffers,
 720         .descr = "Number of buffers"
 721     },
 722     { /* End of list */ }
 723 };
 724
 725 static struct audio_pcm_ops coreaudio_pcm_ops = {
 726     .init_out = coreaudio_init_out,
 727     .fini_out = coreaudio_fini_out,
 728     .run_out  = coreaudio_run_out,
 729     .write    = coreaudio_write,
 730     .ctl_out  = coreaudio_ctl_out
 731 };
 732
 733 struct audio_driver coreaudio_audio_driver = {
 734     .name           = "coreaudio",
 735     .descr          = "CoreAudio http://developer.apple.com/audio/coreaudio.html",
 736     .options        = coreaudio_options,
 737     .init           = coreaudio_audio_init,
 738     .fini           = coreaudio_audio_fini,
 739     .pcm_ops        = &coreaudio_pcm_ops,
 740     .can_be_default = 1,
 741     .max_voices_out = 1,
 742     .max_voices_in  = 0,
 743     .voice_size_out = sizeof (coreaudioVoiceOut),
 744     .voice_size_in  = 0
 745 };