libao2/ao_coreaudio.c

   1 /*
   2  * CoreAudio audio output driver for Mac OS X
   3  *
   4  * original copyright (C) Timothy J. Wood - Aug 2000
   5  * ported to MPlayer libao2 by Dan Christiansen
   6  *
   7  * The S/PDIF part of the code is based on the auhal audio output
   8  * module from VideoLAN:
   9  * Copyright (c) 2006 Derk-Jan Hartman <hartman at videolan dot org>
  10  *
  11  * This file is part of MPlayer.
  12  *
  13  * MPlayer is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * MPlayer is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * along with MPlayer; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 /*
  29  * The MacOS X CoreAudio framework doesn't mesh as simply as some
  30  * simpler frameworks do.  This is due to the fact that CoreAudio pulls
  31  * audio samples rather than having them pushed at it (which is nice
  32  * when you are wanting to do good buffering of audio).
  33  *
  34  * AC-3 and MPEG audio passthrough is possible, but has never been tested
  35  * due to lack of a soundcard that supports it.
  36  */
  37
  38 #include <CoreServices/CoreServices.h>
  39 #include <AudioUnit/AudioUnit.h>
  40 #include <AudioToolbox/AudioToolbox.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44 #include <inttypes.h>
  45 #include <sys/types.h>
  46 #include <unistd.h>
  47
  48 #include "config.h"
  49 #include "mp_msg.h"
  50
  51 #include "audio_out.h"
  52 #include "audio_out_internal.h"
  53 #include "libaf/af_format.h"
  54 #include "osdep/timer.h"
  55 #include "libavutil/fifo.h"
  56
  57 static const ao_info_t info =
  58   {
  59     "Darwin/Mac OS X native audio output",
  60     "coreaudio",
  61     "Timothy J. Wood & Dan Christiansen & Chris Roccati",
  62     ""
  63   };
  64
  65 LIBAO_EXTERN(coreaudio)
  66
  67 /* Prefix for all mp_msg() calls */
  68 #define ao_msg(a, b, c...) mp_msg(a, b, "AO: [coreaudio] " c)
  69
  70 typedef struct ao_coreaudio_s
  71 {
  72   AudioDeviceID i_selected_dev;             /* Keeps DeviceID of the selected device. */
  73   int b_supports_digital;                   /* Does the currently selected device support digital mode? */
  74   int b_digital;                            /* Are we running in digital mode? */
  75   int b_muted;                              /* Are we muted in digital mode? */
  76
  77   /* AudioUnit */
  78   AudioUnit theOutputUnit;
  79
  80   /* CoreAudio SPDIF mode specific */
  81   pid_t i_hog_pid;                          /* Keeps the pid of our hog status. */
  82   AudioStreamID i_stream_id;                /* The StreamID that has a cac3 streamformat */
  83   int i_stream_index;                       /* The index of i_stream_id in an AudioBufferList */
  84   AudioStreamBasicDescription stream_format;/* The format we changed the stream to */
  85   AudioStreamBasicDescription sfmt_revert;  /* The original format of the stream */
  86   int b_revert;                             /* Whether we need to revert the stream format */
  87   int b_changed_mixing;                     /* Whether we need to set the mixing mode back */
  88   int b_stream_format_changed;              /* Flag for main thread to reset stream's format to digital and reset buffer */
  89
  90   /* Original common part */
  91   int packetSize;
  92   int paused;
  93
  94   /* Ring-buffer */
  95   AVFifoBuffer *buffer;
  96   unsigned int buffer_len; ///< must always be num_chunks * chunk_size
  97   unsigned int num_chunks;
  98   unsigned int chunk_size;
  99 } ao_coreaudio_t;
 100
 101 static ao_coreaudio_t *ao = NULL;
 102
 103 /**
 104  * \brief add data to ringbuffer
 105  */
 106 static int write_buffer(unsigned char* data, int len){
 107   int free = ao->buffer_len - av_fifo_size(ao->buffer);
 108   if (len > free) len = free;
 109   return av_fifo_generic_write(ao->buffer, data, len, NULL);
 110 }
 111
 112 /**
 113  * \brief remove data from ringbuffer
 114  */
 115 static int read_buffer(unsigned char* data,int len){
 116   int buffered = av_fifo_size(ao->buffer);
 117   if (len > buffered) len = buffered;
 118   av_fifo_generic_read(ao->buffer, data, len, NULL);
 119   return len;
 120 }
 121
 122 static OSStatus theRenderProc(void *inRefCon,
 123                               AudioUnitRenderActionFlags *inActionFlags,
 124                               const AudioTimeStamp *inTimeStamp,
 125                               UInt32 inBusNumber, UInt32 inNumFrames,
 126                               AudioBufferList *ioData)
 127 {
 128 int amt=av_fifo_size(ao->buffer);
 129 int req=(inNumFrames)*ao->packetSize;
 130
 131         if(amt>req)
 132                 amt=req;
 133
 134         if(amt)
 135                 read_buffer((unsigned char *)ioData->mBuffers[0].mData, amt);
 136         else audio_pause();
 137         ioData->mBuffers[0].mDataByteSize = amt;
 138
 139         return noErr;
 140 }
 141
 142 static int control(int cmd,void *arg){
 143 ao_control_vol_t *control_vol;
 144 OSStatus err;
 145 Float32 vol;
 146         switch (cmd) {
 147         case AOCONTROL_GET_VOLUME:
 148                 control_vol = (ao_control_vol_t*)arg;
 149                 if (ao->b_digital) {
 150                         // Digital output has no volume adjust.
 151                         return CONTROL_FALSE;
 152                 }
 153                 err = AudioUnitGetParameter(ao->theOutputUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, &vol);
 154
 155                 if(err==0) {
 156                         // printf("GET VOL=%f\n", vol);
 157                         control_vol->left=control_vol->right=vol*100.0/4.0;
 158                         return CONTROL_TRUE;
 159                 }
 160                 else {
 161                         ao_msg(MSGT_AO, MSGL_WARN, "could not get HAL output volume: [%4.4s]\n", (char *)&err);
 162                         return CONTROL_FALSE;
 163                 }
 164
 165         case AOCONTROL_SET_VOLUME:
 166                 control_vol = (ao_control_vol_t*)arg;
 167
 168                 if (ao->b_digital) {
 169                         // Digital output can not set volume. Here we have to return true
 170                         // to make mixer forget it. Else mixer will add a soft filter,
 171                         // that's not we expected and the filter not support ac3 stream
 172                         // will cause mplayer die.
 173
 174                         // Although not support set volume, but at least we support mute.
 175                         // MPlayer set mute by set volume to zero, we handle it.
 176                         if (control_vol->left == 0 && control_vol->right == 0)
 177                                 ao->b_muted = 1;
 178                         else
 179                                 ao->b_muted = 0;
 180                         return CONTROL_TRUE;
 181                 }
 182
 183                 vol=(control_vol->left+control_vol->right)*4.0/200.0;
 184                 err = AudioUnitSetParameter(ao->theOutputUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, vol, 0);
 185                 if(err==0) {
 186                         // printf("SET VOL=%f\n", vol);
 187                         return CONTROL_TRUE;
 188                 }
 189                 else {
 190                         ao_msg(MSGT_AO, MSGL_WARN, "could not set HAL output volume: [%4.4s]\n", (char *)&err);
 191                         return CONTROL_FALSE;
 192                 }
 193           /* Everything is currently unimplemented */
 194         default:
 195           return CONTROL_FALSE;
 196         }
 197
 198 }
 199
 200
 201 static void print_format(int lev, const char* str, const AudioStreamBasicDescription *f){
 202     uint32_t flags=(uint32_t) f->mFormatFlags;
 203     ao_msg(MSGT_AO,lev, "%s %7.1fHz %lubit [%c%c%c%c][%lu][%lu][%lu][%lu][%lu] %s %s %s%s%s%s\n",
 204             str, f->mSampleRate, f->mBitsPerChannel,
 205             (int)(f->mFormatID & 0xff000000) >> 24,
 206             (int)(f->mFormatID & 0x00ff0000) >> 16,
 207             (int)(f->mFormatID & 0x0000ff00) >>  8,
 208             (int)(f->mFormatID & 0x000000ff) >>  0,
 209             f->mFormatFlags, f->mBytesPerPacket,
 210             f->mFramesPerPacket, f->mBytesPerFrame,
 211             f->mChannelsPerFrame,
 212             (flags&kAudioFormatFlagIsFloat) ? "float" : "int",
 213             (flags&kAudioFormatFlagIsBigEndian) ? "BE" : "LE",
 214             (flags&kAudioFormatFlagIsSignedInteger) ? "S" : "U",
 215             (flags&kAudioFormatFlagIsPacked) ? " packed" : "",
 216             (flags&kAudioFormatFlagIsAlignedHigh) ? " aligned" : "",
 217             (flags&kAudioFormatFlagIsNonInterleaved) ? " ni" : "" );
 218 }
 219
 220
 221 static int AudioDeviceSupportsDigital( AudioDeviceID i_dev_id );
 222 static int AudioStreamSupportsDigital( AudioStreamID i_stream_id );
 223 static int OpenSPDIF(void);
 224 static int AudioStreamChangeFormat( AudioStreamID i_stream_id, AudioStreamBasicDescription change_format );
 225 static OSStatus RenderCallbackSPDIF( AudioDeviceID inDevice,
 226                                     const AudioTimeStamp * inNow,
 227                                     const void * inInputData,
 228                                     const AudioTimeStamp * inInputTime,
 229                                     AudioBufferList * outOutputData,
 230                                     const AudioTimeStamp * inOutputTime,
 231                                     void * threadGlobals );
 232 static OSStatus StreamListener( AudioStreamID inStream,
 233                                 UInt32 inChannel,
 234                                 AudioDevicePropertyID inPropertyID,
 235                                 void * inClientData );
 236 static OSStatus DeviceListener( AudioDeviceID inDevice,
 237                                 UInt32 inChannel,
 238                                 Boolean isInput,
 239                                 AudioDevicePropertyID inPropertyID,
 240                                 void* inClientData );
 241
 242 static int init(int rate,int channels,int format,int flags)
 243 {
 244 AudioStreamBasicDescription inDesc;
 245 ComponentDescription desc;
 246 Component comp;
 247 AURenderCallbackStruct renderCallback;
 248 OSStatus err;
 249 UInt32 size, maxFrames, i_param_size;
 250 char *psz_name;
 251 AudioDeviceID devid_def = 0;
 252 int b_alive;
 253
 254     ao_msg(MSGT_AO,MSGL_V, "init([%dHz][%dch][%s][%d])\n", rate, channels, af_fmt2str_short(format), flags);
 255
 256     ao = calloc(1, sizeof(ao_coreaudio_t));
 257
 258     ao->i_selected_dev = 0;
 259     ao->b_supports_digital = 0;
 260     ao->b_digital = 0;
 261     ao->b_muted = 0;
 262     ao->b_stream_format_changed = 0;
 263     ao->i_hog_pid = -1;
 264     ao->i_stream_id = 0;
 265     ao->i_stream_index = -1;
 266     ao->b_revert = 0;
 267     ao->b_changed_mixing = 0;
 268
 269     /* Probe whether device support S/PDIF stream output if input is AC3 stream. */
 270     if (AF_FORMAT_IS_AC3(format))
 271     {
 272         /* Find the ID of the default Device. */
 273         i_param_size = sizeof(AudioDeviceID);
 274         err = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice,
 275                                        &i_param_size, &devid_def);
 276         if (err != noErr)
 277         {
 278             ao_msg(MSGT_AO, MSGL_WARN, "could not get default audio device: [%4.4s]\n", (char *)&err);
 279             goto err_out;
 280         }
 281
 282         /* Retrieve the length of the device name. */
 283         i_param_size = 0;
 284         err = AudioDeviceGetPropertyInfo(devid_def, 0, 0,
 285                                          kAudioDevicePropertyDeviceName,
 286                                          &i_param_size, NULL);
 287         if (err != noErr)
 288         {
 289             ao_msg(MSGT_AO, MSGL_WARN, "could not get default audio device name length: [%4.4s]\n", (char *)&err);
 290             goto err_out;
 291         }
 292
 293         /* Retrieve the name of the device. */
 294         psz_name = malloc(i_param_size);
 295         err = AudioDeviceGetProperty(devid_def, 0, 0,
 296                                      kAudioDevicePropertyDeviceName,
 297                                      &i_param_size, psz_name);
 298         if (err != noErr)
 299         {
 300             ao_msg(MSGT_AO, MSGL_WARN, "could not get default audio device name: [%4.4s]\n", (char *)&err);
 301             free( psz_name);
 302             goto err_out;
 303         }
 304
 305         ao_msg(MSGT_AO,MSGL_V, "got default audio output device ID: %#lx Name: %s\n", devid_def, psz_name );
 306
 307         if (AudioDeviceSupportsDigital(devid_def))
 308         {
 309             ao->b_supports_digital = 1;
 310             ao->i_selected_dev = devid_def;
 311         }
 312         ao_msg(MSGT_AO,MSGL_V, "probe default audio output device whether support digital s/pdif output:%d\n", ao->b_supports_digital );
 313
 314         free( psz_name);
 315     }
 316
 317         // Build Description for the input format
 318         inDesc.mSampleRate=rate;
 319         inDesc.mFormatID=ao->b_supports_digital ? kAudioFormat60958AC3 : kAudioFormatLinearPCM;
 320         inDesc.mChannelsPerFrame=channels;
 321         inDesc.mBitsPerChannel=af_fmt2bits(format);
 322
 323     if((format&AF_FORMAT_POINT_MASK)==AF_FORMAT_F) {
 324         // float
 325                 inDesc.mFormatFlags = kAudioFormatFlagIsFloat|kAudioFormatFlagIsPacked;
 326     }
 327     else if((format&AF_FORMAT_SIGN_MASK)==AF_FORMAT_SI) {
 328         // signed int
 329                 inDesc.mFormatFlags = kAudioFormatFlagIsSignedInteger|kAudioFormatFlagIsPacked;
 330     }
 331     else {
 332         // unsigned int
 333                 inDesc.mFormatFlags = kAudioFormatFlagIsPacked;
 334     }
 335     if ((format & AF_FORMAT_END_MASK) == AF_FORMAT_BE)
 336         inDesc.mFormatFlags |= kAudioFormatFlagIsBigEndian;
 337
 338     inDesc.mFramesPerPacket = 1;
 339     ao->packetSize = inDesc.mBytesPerPacket = inDesc.mBytesPerFrame = inDesc.mFramesPerPacket*channels*(inDesc.mBitsPerChannel/8);
 340     print_format(MSGL_V, "source:",&inDesc);
 341
 342     if (ao->b_supports_digital)
 343     {
 344         b_alive = 1;
 345         i_param_size = sizeof(b_alive);
 346         err = AudioDeviceGetProperty(ao->i_selected_dev, 0, FALSE,
 347                                      kAudioDevicePropertyDeviceIsAlive,
 348                                      &i_param_size, &b_alive);
 349         if (err != noErr)
 350             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is alive: [%4.4s]\n", (char *)&err);
 351         if (!b_alive)
 352             ao_msg(MSGT_AO, MSGL_WARN, "device is not alive\n" );
 353         /* S/PDIF output need device in HogMode. */
 354         i_param_size = sizeof(ao->i_hog_pid);
 355         err = AudioDeviceGetProperty(ao->i_selected_dev, 0, FALSE,
 356                                      kAudioDevicePropertyHogMode,
 357                                      &i_param_size, &ao->i_hog_pid);
 358
 359         if (err != noErr)
 360         {
 361             /* This is not a fatal error. Some drivers simply don't support this property. */
 362             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is hogged: [%4.4s]\n",
 363                      (char *)&err);
 364             ao->i_hog_pid = -1;
 365         }
 366
 367         if (ao->i_hog_pid != -1 && ao->i_hog_pid != getpid())
 368         {
 369             ao_msg(MSGT_AO, MSGL_WARN, "Selected audio device is exclusively in use by another program.\n" );
 370             goto err_out;
 371         }
 372         ao->stream_format = inDesc;
 373         return OpenSPDIF();
 374     }
 375
 376         /* original analog output code */
 377         desc.componentType = kAudioUnitType_Output;
 378         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 379         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 380         desc.componentFlags = 0;
 381         desc.componentFlagsMask = 0;
 382
 383         comp = FindNextComponent(NULL, &desc);  //Finds an component that meets the desc spec's
 384         if (comp == NULL) {
 385                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to find Output Unit component\n");
 386                 goto err_out;
 387         }
 388
 389         err = OpenAComponent(comp, &(ao->theOutputUnit));  //gains access to the services provided by the component
 390         if (err) {
 391                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to open Output Unit component: [%4.4s]\n", (char *)&err);
 392                 goto err_out;
 393         }
 394
 395         // Initialize AudioUnit
 396         err = AudioUnitInitialize(ao->theOutputUnit);
 397         if (err) {
 398                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to initialize Output Unit component: [%4.4s]\n", (char *)&err);
 399                 goto err_out1;
 400         }
 401
 402         size =  sizeof(AudioStreamBasicDescription);
 403         err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &inDesc, size);
 404
 405         if (err) {
 406                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the input format: [%4.4s]\n", (char *)&err);
 407                 goto err_out2;
 408         }
 409
 410         size = sizeof(UInt32);
 411         err = AudioUnitGetProperty(ao->theOutputUnit, kAudioDevicePropertyBufferSize, kAudioUnitScope_Input, 0, &maxFrames, &size);
 412
 413         if (err)
 414         {
 415                 ao_msg(MSGT_AO,MSGL_WARN, "AudioUnitGetProperty returned [%4.4s] when getting kAudioDevicePropertyBufferSize\n", (char *)&err);
 416                 goto err_out2;
 417         }
 418
 419         ao->chunk_size = maxFrames;//*inDesc.mBytesPerFrame;
 420
 421         ao_data.samplerate = inDesc.mSampleRate;
 422         ao_data.channels = inDesc.mChannelsPerFrame;
 423     ao_data.bps = ao_data.samplerate * inDesc.mBytesPerFrame;
 424     ao_data.outburst = ao->chunk_size;
 425         ao_data.buffersize = ao_data.bps;
 426
 427         ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 428     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 429     ao->buffer = av_fifo_alloc(ao->buffer_len);
 430
 431         ao_msg(MSGT_AO,MSGL_V, "using %5d chunks of %d bytes (buffer len %d bytes)\n", (int)ao->num_chunks, (int)ao->chunk_size, (int)ao->buffer_len);
 432
 433     renderCallback.inputProc = theRenderProc;
 434     renderCallback.inputProcRefCon = 0;
 435     err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &renderCallback, sizeof(AURenderCallbackStruct));
 436         if (err) {
 437                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the render callback: [%4.4s]\n", (char *)&err);
 438                 goto err_out2;
 439         }
 440
 441         reset();
 442
 443     return CONTROL_OK;
 444
 445 err_out2:
 446     AudioUnitUninitialize(ao->theOutputUnit);
 447 err_out1:
 448     CloseComponent(ao->theOutputUnit);
 449 err_out:
 450     av_fifo_free(ao->buffer);
 451     free(ao);
 452     ao = NULL;
 453     return CONTROL_FALSE;
 454 }
 455
 456 /*****************************************************************************
 457  * Setup a encoded digital stream (SPDIF)
 458  *****************************************************************************/
 459 static int OpenSPDIF(void)
 460 {
 461     OSStatus                err = noErr;
 462     UInt32                  i_param_size, b_mix = 0;
 463     Boolean                 b_writeable = 0;
 464     AudioStreamID           *p_streams = NULL;
 465     int                     i, i_streams = 0;
 466
 467     /* Start doing the SPDIF setup process. */
 468     ao->b_digital = 1;
 469
 470     /* Hog the device. */
 471     i_param_size = sizeof(ao->i_hog_pid);
 472     ao->i_hog_pid = getpid() ;
 473
 474     err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
 475                                  kAudioDevicePropertyHogMode, i_param_size, &ao->i_hog_pid);
 476
 477     if (err != noErr)
 478     {
 479         ao_msg(MSGT_AO, MSGL_WARN, "failed to set hogmode: [%4.4s]\n", (char *)&err);
 480         ao->i_hog_pid = -1;
 481         goto err_out;
 482     }
 483
 484     /* Set mixable to false if we are allowed to. */
 485     err = AudioDeviceGetPropertyInfo(ao->i_selected_dev, 0, FALSE,
 486                                      kAudioDevicePropertySupportsMixing,
 487                                      &i_param_size, &b_writeable);
 488     err = AudioDeviceGetProperty(ao->i_selected_dev, 0, FALSE,
 489                                  kAudioDevicePropertySupportsMixing,
 490                                  &i_param_size, &b_mix);
 491     if (err != noErr && b_writeable)
 492     {
 493         b_mix = 0;
 494         err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
 495                                      kAudioDevicePropertySupportsMixing,
 496                                      i_param_size, &b_mix);
 497         ao->b_changed_mixing = 1;
 498     }
 499     if (err != noErr)
 500     {
 501         ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
 502         goto err_out;
 503     }
 504
 505     /* Get a list of all the streams on this device. */
 506     err = AudioDeviceGetPropertyInfo(ao->i_selected_dev, 0, FALSE,
 507                                      kAudioDevicePropertyStreams,
 508                                      &i_param_size, NULL);
 509     if (err != noErr)
 510     {
 511         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams: [%4.4s]\n", (char *)&err);
 512         goto err_out;
 513     }
 514
 515     i_streams = i_param_size / sizeof(AudioStreamID);
 516     p_streams = malloc(i_param_size);
 517     if (p_streams == NULL)
 518     {
 519         ao_msg(MSGT_AO, MSGL_WARN, "out of memory\n" );
 520         goto err_out;
 521     }
 522
 523     err = AudioDeviceGetProperty(ao->i_selected_dev, 0, FALSE,
 524                                  kAudioDevicePropertyStreams,
 525                                  &i_param_size, p_streams);
 526     if (err != noErr)
 527     {
 528         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams: [%4.4s]\n", (char *)&err);
 529         if (p_streams) free(p_streams);
 530         goto err_out;
 531     }
 532
 533     ao_msg(MSGT_AO, MSGL_V, "current device stream number: %d\n", i_streams);
 534
 535     for (i = 0; i < i_streams && ao->i_stream_index < 0; ++i)
 536     {
 537         /* Find a stream with a cac3 stream. */
 538         AudioStreamBasicDescription *p_format_list = NULL;
 539         int i_formats = 0, j = 0, b_digital = 0;
 540
 541         /* Retrieve all the stream formats supported by each output stream. */
 542         err = AudioStreamGetPropertyInfo(p_streams[i], 0,
 543                                          kAudioStreamPropertyPhysicalFormats,
 544                                          &i_param_size, NULL);
 545         if (err != noErr)
 546         {
 547             ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streamformats: [%4.4s]\n", (char *)&err);
 548             continue;
 549         }
 550
 551         i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 552         p_format_list = malloc(i_param_size);
 553         if (p_format_list == NULL)
 554         {
 555             ao_msg(MSGT_AO, MSGL_WARN, "could not malloc the memory\n" );
 556             continue;
 557         }
 558
 559         err = AudioStreamGetProperty(p_streams[i], 0,
 560                                      kAudioStreamPropertyPhysicalFormats,
 561                                      &i_param_size, p_format_list);
 562         if (err != noErr)
 563         {
 564             ao_msg(MSGT_AO, MSGL_WARN, "could not get the list of streamformats: [%4.4s]\n", (char *)&err);
 565             if (p_format_list) free(p_format_list);
 566             continue;
 567         }
 568
 569         /* Check if one of the supported formats is a digital format. */
 570         for (j = 0; j < i_formats; ++j)
 571         {
 572             if (p_format_list[j].mFormatID == 'IAC3' ||
 573                   p_format_list[j].mFormatID == kAudioFormat60958AC3)
 574             {
 575                 b_digital = 1;
 576                 break;
 577             }
 578         }
 579
 580         if (b_digital)
 581         {
 582             /* If this stream supports a digital (cac3) format, then set it. */
 583             int i_requested_rate_format = -1;
 584             int i_current_rate_format = -1;
 585             int i_backup_rate_format = -1;
 586
 587             ao->i_stream_id = p_streams[i];
 588             ao->i_stream_index = i;
 589
 590             if (ao->b_revert == 0)
 591             {
 592                 /* Retrieve the original format of this stream first if not done so already. */
 593                 i_param_size = sizeof(ao->sfmt_revert);
 594                 err = AudioStreamGetProperty(ao->i_stream_id, 0,
 595                                              kAudioStreamPropertyPhysicalFormat,
 596                                              &i_param_size,
 597                                              &ao->sfmt_revert);
 598                 if (err != noErr)
 599                 {
 600                     ao_msg(MSGT_AO, MSGL_WARN, "could not retrieve the original streamformat: [%4.4s]\n", (char *)&err);
 601                     if (p_format_list) free(p_format_list);
 602                     continue;
 603                 }
 604                 ao->b_revert = 1;
 605             }
 606
 607             for (j = 0; j < i_formats; ++j)
 608                 if (p_format_list[j].mFormatID == 'IAC3' ||
 609                       p_format_list[j].mFormatID == kAudioFormat60958AC3)
 610                 {
 611                     if (p_format_list[j].mSampleRate == ao->stream_format.mSampleRate)
 612                     {
 613                         i_requested_rate_format = j;
 614                         break;
 615                     }
 616                     if (p_format_list[j].mSampleRate == ao->sfmt_revert.mSampleRate)
 617                         i_current_rate_format = j;
 618                     else if (i_backup_rate_format < 0 || p_format_list[j].mSampleRate > p_format_list[i_backup_rate_format].mSampleRate)
 619                         i_backup_rate_format = j;
 620                 }
 621
 622             if (i_requested_rate_format >= 0) /* We prefer to output at the samplerate of the original audio. */
 623                 ao->stream_format = p_format_list[i_requested_rate_format];
 624             else if (i_current_rate_format >= 0) /* If not possible, we will try to use the current samplerate of the device. */
 625                 ao->stream_format = p_format_list[i_current_rate_format];
 626             else ao->stream_format = p_format_list[i_backup_rate_format]; /* And if we have to, any digital format will be just fine (highest rate possible). */
 627         }
 628         if (p_format_list) free(p_format_list);
 629     }
 630     if (p_streams) free(p_streams);
 631
 632     if (ao->i_stream_index < 0)
 633     {
 634         ao_msg(MSGT_AO, MSGL_WARN, "can not find any digital output stream format when OpenSPDIF().\n");
 635         goto err_out;
 636     }
 637
 638     print_format(MSGL_V, "original stream format:", &ao->sfmt_revert);
 639
 640     if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
 641         goto err_out;
 642
 643     err = AudioDeviceAddPropertyListener(ao->i_selected_dev,
 644                                          kAudioPropertyWildcardChannel,
 645                                          0,
 646                                          kAudioDevicePropertyDeviceHasChanged,
 647                                          DeviceListener,
 648                                          NULL);
 649     if (err != noErr)
 650         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddPropertyListener for kAudioDevicePropertyDeviceHasChanged failed: [%4.4s]\n", (char *)&err);
 651
 652
 653     /* FIXME: If output stream is not native byte-order, we need change endian somewhere. */
 654     /*        Although there's no such case reported.                                     */
 655 #if HAVE_BIGENDIAN
 656     if (!(ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian))
 657 #else
 658     if (ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian)
 659 #endif
 660         ao_msg(MSGT_AO, MSGL_WARN, "output stream has a no-native byte-order, digital output may failed.\n");
 661
 662     /* For ac3/dts, just use packet size 6144 bytes as chunk size. */
 663     ao->chunk_size = ao->stream_format.mBytesPerPacket;
 664
 665     ao_data.samplerate = ao->stream_format.mSampleRate;
 666     ao_data.channels = ao->stream_format.mChannelsPerFrame;
 667     ao_data.bps = ao_data.samplerate * (ao->stream_format.mBytesPerPacket/ao->stream_format.mFramesPerPacket);
 668     ao_data.outburst = ao->chunk_size;
 669     ao_data.buffersize = ao_data.bps;
 670
 671     ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 672     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 673     ao->buffer = av_fifo_alloc(ao->buffer_len);
 674
 675     ao_msg(MSGT_AO,MSGL_V, "using %5d chunks of %d bytes (buffer len %d bytes)\n", (int)ao->num_chunks, (int)ao->chunk_size, (int)ao->buffer_len);
 676
 677
 678     /* Add IOProc callback. */
 679     err = AudioDeviceAddIOProc(ao->i_selected_dev,
 680                                (AudioDeviceIOProc)RenderCallbackSPDIF,
 681                                (void *)ao);
 682     if (err != noErr)
 683     {
 684         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddIOProc failed: [%4.4s]\n", (char *)&err);
 685         goto err_out1;
 686     }
 687
 688     reset();
 689
 690     return CONTROL_TRUE;
 691
 692 err_out1:
 693     if (ao->b_revert)
 694         AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
 695 err_out:
 696     if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
 697     {
 698         int b_mix = 1;
 699         err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
 700                                      kAudioDevicePropertySupportsMixing,
 701                                      i_param_size, &b_mix);
 702         if (err != noErr)
 703             ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n",
 704                    (char *)&err);
 705     }
 706     if (ao->i_hog_pid == getpid())
 707     {
 708         ao->i_hog_pid = -1;
 709         i_param_size = sizeof(ao->i_hog_pid);
 710         err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
 711                                      kAudioDevicePropertyHogMode,
 712                                      i_param_size, &ao->i_hog_pid);
 713         if (err != noErr)
 714             ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n",
 715                    (char *)&err);
 716     }
 717     av_fifo_free(ao->buffer);
 718     free(ao);
 719     ao = NULL;
 720     return CONTROL_FALSE;
 721 }
 722
 723 /*****************************************************************************
 724  * AudioDeviceSupportsDigital: Check i_dev_id for digital stream support.
 725  *****************************************************************************/
 726 static int AudioDeviceSupportsDigital( AudioDeviceID i_dev_id )
 727 {
 728     OSStatus                    err = noErr;
 729     UInt32                      i_param_size = 0;
 730     AudioStreamID               *p_streams = NULL;
 731     int                         i = 0, i_streams = 0;
 732     int                         b_return = CONTROL_FALSE;
 733
 734     /* Retrieve all the output streams. */
 735     err = AudioDeviceGetPropertyInfo(i_dev_id, 0, FALSE,
 736                                      kAudioDevicePropertyStreams,
 737                                      &i_param_size, NULL);
 738     if (err != noErr)
 739     {
 740         ao_msg(MSGT_AO,MSGL_V, "could not get number of streams: [%4.4s]\n", (char *)&err);
 741         return CONTROL_FALSE;
 742     }
 743
 744     i_streams = i_param_size / sizeof(AudioStreamID);
 745     p_streams = malloc(i_param_size);
 746     if (p_streams == NULL)
 747     {
 748         ao_msg(MSGT_AO,MSGL_V, "out of memory\n");
 749         return CONTROL_FALSE;
 750     }
 751
 752     err = AudioDeviceGetProperty(i_dev_id, 0, FALSE,
 753                                  kAudioDevicePropertyStreams,
 754                                  &i_param_size, p_streams);
 755
 756     if (err != noErr)
 757     {
 758         ao_msg(MSGT_AO,MSGL_V, "could not get number of streams: [%4.4s]\n", (char *)&err);
 759         free(p_streams);
 760         return CONTROL_FALSE;
 761     }
 762
 763     for (i = 0; i < i_streams; ++i)
 764     {
 765         if (AudioStreamSupportsDigital(p_streams[i]))
 766             b_return = CONTROL_OK;
 767     }
 768
 769     free(p_streams);
 770     return b_return;
 771 }
 772
 773 /*****************************************************************************
 774  * AudioStreamSupportsDigital: Check i_stream_id for digital stream support.
 775  *****************************************************************************/
 776 static int AudioStreamSupportsDigital( AudioStreamID i_stream_id )
 777 {
 778     OSStatus err = noErr;
 779     UInt32 i_param_size;
 780     AudioStreamBasicDescription *p_format_list = NULL;
 781     int i, i_formats, b_return = CONTROL_FALSE;
 782
 783     /* Retrieve all the stream formats supported by each output stream. */
 784     err = AudioStreamGetPropertyInfo(i_stream_id, 0,
 785                                      kAudioStreamPropertyPhysicalFormats,
 786                                      &i_param_size, NULL);
 787     if (err != noErr)
 788     {
 789         ao_msg(MSGT_AO,MSGL_V, "could not get number of streamformats: [%4.4s]\n", (char *)&err);
 790         return CONTROL_FALSE;
 791     }
 792
 793     i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 794     p_format_list = malloc(i_param_size);
 795     if (p_format_list == NULL)
 796     {
 797         ao_msg(MSGT_AO,MSGL_V, "could not malloc the memory\n" );
 798         return CONTROL_FALSE;
 799     }
 800
 801     err = AudioStreamGetProperty(i_stream_id, 0,
 802                                  kAudioStreamPropertyPhysicalFormats,
 803                                  &i_param_size, p_format_list);
 804     if (err != noErr)
 805     {
 806         ao_msg(MSGT_AO,MSGL_V, "could not get the list of streamformats: [%4.4s]\n", (char *)&err);
 807         free(p_format_list);
 808         return CONTROL_FALSE;
 809     }
 810
 811     for (i = 0; i < i_formats; ++i)
 812     {
 813         print_format(MSGL_V, "supported format:", &p_format_list[i]);
 814
 815         if (p_format_list[i].mFormatID == 'IAC3' ||
 816                   p_format_list[i].mFormatID == kAudioFormat60958AC3)
 817             b_return = CONTROL_OK;
 818     }
 819
 820     free(p_format_list);
 821     return b_return;
 822 }
 823
 824 /*****************************************************************************
 825  * AudioStreamChangeFormat: Change i_stream_id to change_format
 826  *****************************************************************************/
 827 static int AudioStreamChangeFormat( AudioStreamID i_stream_id, AudioStreamBasicDescription change_format )
 828 {
 829     OSStatus err = noErr;
 830     UInt32 i_param_size = 0;
 831     int i;
 832
 833     static volatile int stream_format_changed;
 834     stream_format_changed = 0;
 835
 836     print_format(MSGL_V, "setting stream format:", &change_format);
 837
 838     /* Install the callback. */
 839     err = AudioStreamAddPropertyListener(i_stream_id, 0,
 840                                          kAudioStreamPropertyPhysicalFormat,
 841                                          StreamListener,
 842                                          (void *)&stream_format_changed);
 843     if (err != noErr)
 844     {
 845         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamAddPropertyListener failed: [%4.4s]\n", (char *)&err);
 846         return CONTROL_FALSE;
 847     }
 848
 849     /* Change the format. */
 850     err = AudioStreamSetProperty(i_stream_id, 0, 0,
 851                                  kAudioStreamPropertyPhysicalFormat,
 852                                  sizeof(AudioStreamBasicDescription),
 853                                  &change_format);
 854     if (err != noErr)
 855     {
 856         ao_msg(MSGT_AO, MSGL_WARN, "could not set the stream format: [%4.4s]\n", (char *)&err);
 857         return CONTROL_FALSE;
 858     }
 859
 860     /* The AudioStreamSetProperty is not only asynchronious,
 861      * it is also not Atomic, in its behaviour.
 862      * Therefore we check 5 times before we really give up.
 863      * FIXME: failing isn't actually implemented yet. */
 864     for (i = 0; i < 5; ++i)
 865     {
 866         AudioStreamBasicDescription actual_format;
 867         int j;
 868         for (j = 0; !stream_format_changed && j < 50; ++j)
 869             usec_sleep(10000);
 870         if (stream_format_changed)
 871             stream_format_changed = 0;
 872         else
 873             ao_msg(MSGT_AO, MSGL_V, "reached timeout\n" );
 874
 875         i_param_size = sizeof(AudioStreamBasicDescription);
 876         err = AudioStreamGetProperty(i_stream_id, 0,
 877                                      kAudioStreamPropertyPhysicalFormat,
 878                                      &i_param_size,
 879                                      &actual_format);
 880
 881         print_format(MSGL_V, "actual format in use:", &actual_format);
 882         if (actual_format.mSampleRate == change_format.mSampleRate &&
 883             actual_format.mFormatID == change_format.mFormatID &&
 884             actual_format.mFramesPerPacket == change_format.mFramesPerPacket)
 885         {
 886             /* The right format is now active. */
 887             break;
 888         }
 889         /* We need to check again. */
 890     }
 891
 892     /* Removing the property listener. */
 893     err = AudioStreamRemovePropertyListener(i_stream_id, 0,
 894                                             kAudioStreamPropertyPhysicalFormat,
 895                                             StreamListener);
 896     if (err != noErr)
 897     {
 898         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamRemovePropertyListener failed: [%4.4s]\n", (char *)&err);
 899         return CONTROL_FALSE;
 900     }
 901
 902     return CONTROL_TRUE;
 903 }
 904
 905 /*****************************************************************************
 906  * RenderCallbackSPDIF: callback for SPDIF audio output
 907  *****************************************************************************/
 908 static OSStatus RenderCallbackSPDIF( AudioDeviceID inDevice,
 909                                     const AudioTimeStamp * inNow,
 910                                     const void * inInputData,
 911                                     const AudioTimeStamp * inInputTime,
 912                                     AudioBufferList * outOutputData,
 913                                     const AudioTimeStamp * inOutputTime,
 914                                     void * threadGlobals )
 915 {
 916     int amt = av_fifo_size(ao->buffer);
 917     int req = outOutputData->mBuffers[ao->i_stream_index].mDataByteSize;
 918
 919     if (amt > req)
 920         amt = req;
 921     if (amt)
 922         read_buffer(ao->b_muted ? NULL : (unsigned char *)outOutputData->mBuffers[ao->i_stream_index].mData, amt);
 923
 924     return noErr;
 925 }
 926
 927
 928 static int play(void* output_samples,int num_bytes,int flags)
 929 {
 930     int wrote, b_digital;
 931
 932     // Check whether we need to reset the digital output stream.
 933     if (ao->b_digital && ao->b_stream_format_changed)
 934     {
 935         ao->b_stream_format_changed = 0;
 936         b_digital = AudioStreamSupportsDigital(ao->i_stream_id);
 937         if (b_digital)
 938         {
 939             /* Current stream support digital format output, let's set it. */
 940             ao_msg(MSGT_AO, MSGL_V, "detected current stream support digital, try to restore digital output...\n");
 941
 942             if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
 943             {
 944                 ao_msg(MSGT_AO, MSGL_WARN, "restore digital output failed.\n");
 945             }
 946             else
 947             {
 948                 ao_msg(MSGT_AO, MSGL_WARN, "restore digital output succeed.\n");
 949                 reset();
 950             }
 951         }
 952         else
 953             ao_msg(MSGT_AO, MSGL_V, "detected current stream do not support digital.\n");
 954     }
 955
 956     wrote=write_buffer(output_samples, num_bytes);
 957     audio_resume();
 958     return wrote;
 959 }
 960
 961 /* set variables and buffer to initial state */
 962 static void reset(void)
 963 {
 964   audio_pause();
 965   av_fifo_reset(ao->buffer);
 966 }
 967
 968
 969 /* return available space */
 970 static int get_space(void)
 971 {
 972   return ao->buffer_len - av_fifo_size(ao->buffer);
 973 }
 974
 975
 976 /* return delay until audio is played */
 977 static float get_delay(void)
 978 {
 979   // inaccurate, should also contain the data buffered e.g. by the OS
 980   return (float)av_fifo_size(ao->buffer)/(float)ao_data.bps;
 981 }
 982
 983
 984 /* unload plugin and deregister from coreaudio */
 985 static void uninit(int immed)
 986 {
 987   OSStatus            err = noErr;
 988   UInt32              i_param_size = 0;
 989
 990   if (!immed) {
 991     long long timeleft=(1000000LL*av_fifo_size(ao->buffer))/ao_data.bps;
 992     ao_msg(MSGT_AO,MSGL_DBG2, "%d bytes left @%d bps (%d usec)\n", av_fifo_size(ao->buffer), ao_data.bps, (int)timeleft);
 993     usec_sleep((int)timeleft);
 994   }
 995
 996   if (!ao->b_digital) {
 997       AudioOutputUnitStop(ao->theOutputUnit);
 998       AudioUnitUninitialize(ao->theOutputUnit);
 999       CloseComponent(ao->theOutputUnit);
1000   }
1001   else {
1002       /* Stop device. */
1003       err = AudioDeviceStop(ao->i_selected_dev,
1004                             (AudioDeviceIOProc)RenderCallbackSPDIF);
1005       if (err != noErr)
1006           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1007
1008       /* Remove IOProc callback. */
1009       err = AudioDeviceRemoveIOProc(ao->i_selected_dev,
1010                                     (AudioDeviceIOProc)RenderCallbackSPDIF);
1011       if (err != noErr)
1012           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceRemoveIOProc failed: [%4.4s]\n", (char *)&err);
1013
1014       if (ao->b_revert)
1015           AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
1016
1017       if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
1018       {
1019           int b_mix;
1020           Boolean b_writeable;
1021           /* Revert mixable to true if we are allowed to. */
1022           err = AudioDeviceGetPropertyInfo(ao->i_selected_dev, 0, FALSE, kAudioDevicePropertySupportsMixing,
1023                                            &i_param_size, &b_writeable);
1024           err = AudioDeviceGetProperty(ao->i_selected_dev, 0, FALSE, kAudioDevicePropertySupportsMixing,
1025                                        &i_param_size, &b_mix);
1026           if (err != noErr && b_writeable)
1027           {
1028               b_mix = 1;
1029               err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
1030                                            kAudioDevicePropertySupportsMixing, i_param_size, &b_mix);
1031           }
1032           if (err != noErr)
1033               ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
1034       }
1035       if (ao->i_hog_pid == getpid())
1036       {
1037           ao->i_hog_pid = -1;
1038           i_param_size = sizeof(ao->i_hog_pid);
1039           err = AudioDeviceSetProperty(ao->i_selected_dev, 0, 0, FALSE,
1040                                        kAudioDevicePropertyHogMode, i_param_size, &ao->i_hog_pid);
1041           if (err != noErr) ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n", (char *)&err);
1042       }
1043   }
1044
1045   av_fifo_free(ao->buffer);
1046   free(ao);
1047   ao = NULL;
1048 }
1049
1050
1051 /* stop playing, keep buffers (for pause) */
1052 static void audio_pause(void)
1053 {
1054     OSErr err=noErr;
1055
1056     /* Stop callback. */
1057     if (!ao->b_digital)
1058     {
1059         err=AudioOutputUnitStop(ao->theOutputUnit);
1060         if (err != noErr)
1061             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStop returned [%4.4s]\n", (char *)&err);
1062     }
1063     else
1064     {
1065         err = AudioDeviceStop(ao->i_selected_dev, (AudioDeviceIOProc)RenderCallbackSPDIF);
1066         if (err != noErr)
1067             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1068     }
1069     ao->paused = 1;
1070 }
1071
1072
1073 /* resume playing, after audio_pause() */
1074 static void audio_resume(void)
1075 {
1076     OSErr err=noErr;
1077
1078     if (!ao->paused)
1079         return;
1080
1081     /* Start callback. */
1082     if (!ao->b_digital)
1083     {
1084         err = AudioOutputUnitStart(ao->theOutputUnit);
1085         if (err != noErr)
1086             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStart returned [%4.4s]\n", (char *)&err);
1087     }
1088     else
1089     {
1090         err = AudioDeviceStart(ao->i_selected_dev, (AudioDeviceIOProc)RenderCallbackSPDIF);
1091         if (err != noErr)
1092             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStart failed: [%4.4s]\n", (char *)&err);
1093     }
1094     ao->paused = 0;
1095 }
1096
1097 /*****************************************************************************
1098  * StreamListener
1099  *****************************************************************************/
1100 static OSStatus StreamListener( AudioStreamID inStream,
1101                                 UInt32 inChannel,
1102                                 AudioDevicePropertyID inPropertyID,
1103                                 void * inClientData )
1104 {
1105     switch (inPropertyID)
1106     {
1107         case kAudioStreamPropertyPhysicalFormat:
1108             ao_msg(MSGT_AO, MSGL_V, "got notify kAudioStreamPropertyPhysicalFormat changed.\n");
1109             if (inClientData)
1110                 *(volatile int *)inClientData = 1;
1111         default:
1112             break;
1113     }
1114     return noErr;
1115 }
1116
1117 static OSStatus DeviceListener( AudioDeviceID inDevice,
1118                                 UInt32 inChannel,
1119                                 Boolean isInput,
1120                                 AudioDevicePropertyID inPropertyID,
1121                                 void* inClientData )
1122 {
1123     switch (inPropertyID)
1124     {
1125         case kAudioDevicePropertyDeviceHasChanged:
1126             ao_msg(MSGT_AO, MSGL_WARN, "got notify kAudioDevicePropertyDeviceHasChanged.\n");
1127             ao->b_stream_format_changed = 1;
1128         default:
1129             break;
1130     }
1131     return noErr;
1132 }