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 #include "subopt-helper.h"
  57
  58 static const ao_info_t info =
  59   {
  60     "Darwin/Mac OS X native audio output",
  61     "coreaudio",
  62     "Timothy J. Wood & Dan Christiansen & Chris Roccati",
  63     ""
  64   };
  65
  66 LIBAO_EXTERN(coreaudio)
  67
  68 /* Prefix for all mp_msg() calls */
  69 #define ao_msg(a, b, c...) mp_msg(a, b, "AO: [coreaudio] " c)
  70
  71 typedef struct ao_coreaudio_s
  72 {
  73   AudioDeviceID i_selected_dev;             /* Keeps DeviceID of the selected device. */
  74   int b_supports_digital;                   /* Does the currently selected device support digital mode? */
  75   int b_digital;                            /* Are we running in digital mode? */
  76   int b_muted;                              /* Are we muted in digital mode? */
  77
  78   AudioDeviceIOProcID renderCallback;       /* Render callback used for SPDIF */
  79
  80   /* AudioUnit */
  81   AudioUnit theOutputUnit;
  82
  83   /* CoreAudio SPDIF mode specific */
  84   pid_t i_hog_pid;                          /* Keeps the pid of our hog status. */
  85   AudioStreamID i_stream_id;                /* The StreamID that has a cac3 streamformat */
  86   int i_stream_index;                       /* The index of i_stream_id in an AudioBufferList */
  87   AudioStreamBasicDescription stream_format;/* The format we changed the stream to */
  88   AudioStreamBasicDescription sfmt_revert;  /* The original format of the stream */
  89   int b_revert;                             /* Whether we need to revert the stream format */
  90   int b_changed_mixing;                     /* Whether we need to set the mixing mode back */
  91   int b_stream_format_changed;              /* Flag for main thread to reset stream's format to digital and reset buffer */
  92
  93   /* Original common part */
  94   int packetSize;
  95   int paused;
  96
  97   /* Ring-buffer */
  98   AVFifoBuffer *buffer;
  99   unsigned int buffer_len; ///< must always be num_chunks * chunk_size
 100   unsigned int num_chunks;
 101   unsigned int chunk_size;
 102 } ao_coreaudio_t;
 103
 104 static ao_coreaudio_t *ao = NULL;
 105
 106 /**
 107  * \brief add data to ringbuffer
 108  */
 109 static int write_buffer(unsigned char* data, int len){
 110   int free = ao->buffer_len - av_fifo_size(ao->buffer);
 111   if (len > free) len = free;
 112   return av_fifo_generic_write(ao->buffer, data, len, NULL);
 113 }
 114
 115 /**
 116  * \brief remove data from ringbuffer
 117  */
 118 static int read_buffer(unsigned char* data,int len){
 119   int buffered = av_fifo_size(ao->buffer);
 120   if (len > buffered) len = buffered;
 121   av_fifo_generic_read(ao->buffer, data, len, NULL);
 122   return len;
 123 }
 124
 125 static OSStatus theRenderProc(void *inRefCon,
 126                               AudioUnitRenderActionFlags *inActionFlags,
 127                               const AudioTimeStamp *inTimeStamp,
 128                               UInt32 inBusNumber, UInt32 inNumFrames,
 129                               AudioBufferList *ioData)
 130 {
 131 int amt=av_fifo_size(ao->buffer);
 132 int req=(inNumFrames)*ao->packetSize;
 133
 134         if(amt>req)
 135                 amt=req;
 136
 137         if(amt)
 138                 read_buffer((unsigned char *)ioData->mBuffers[0].mData, amt);
 139         else audio_pause();
 140         ioData->mBuffers[0].mDataByteSize = amt;
 141
 142         return noErr;
 143 }
 144
 145 static int control(int cmd,void *arg){
 146 ao_control_vol_t *control_vol;
 147 OSStatus err;
 148 Float32 vol;
 149         switch (cmd) {
 150         case AOCONTROL_GET_VOLUME:
 151                 control_vol = (ao_control_vol_t*)arg;
 152                 if (ao->b_digital) {
 153                         // Digital output has no volume adjust.
 154                         return CONTROL_FALSE;
 155                 }
 156                 err = AudioUnitGetParameter(ao->theOutputUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, &vol);
 157
 158                 if(err==0) {
 159                         // printf("GET VOL=%f\n", vol);
 160                         control_vol->left=control_vol->right=vol*100.0/4.0;
 161                         return CONTROL_TRUE;
 162                 }
 163                 else {
 164                         ao_msg(MSGT_AO, MSGL_WARN, "could not get HAL output volume: [%4.4s]\n", (char *)&err);
 165                         return CONTROL_FALSE;
 166                 }
 167
 168         case AOCONTROL_SET_VOLUME:
 169                 control_vol = (ao_control_vol_t*)arg;
 170
 171                 if (ao->b_digital) {
 172                         // Digital output can not set volume. Here we have to return true
 173                         // to make mixer forget it. Else mixer will add a soft filter,
 174                         // that's not we expected and the filter not support ac3 stream
 175                         // will cause mplayer die.
 176
 177                         // Although not support set volume, but at least we support mute.
 178                         // MPlayer set mute by set volume to zero, we handle it.
 179                         if (control_vol->left == 0 && control_vol->right == 0)
 180                                 ao->b_muted = 1;
 181                         else
 182                                 ao->b_muted = 0;
 183                         return CONTROL_TRUE;
 184                 }
 185
 186                 vol=(control_vol->left+control_vol->right)*4.0/200.0;
 187                 err = AudioUnitSetParameter(ao->theOutputUnit, kHALOutputParam_Volume, kAudioUnitScope_Global, 0, vol, 0);
 188                 if(err==0) {
 189                         // printf("SET VOL=%f\n", vol);
 190                         return CONTROL_TRUE;
 191                 }
 192                 else {
 193                         ao_msg(MSGT_AO, MSGL_WARN, "could not set HAL output volume: [%4.4s]\n", (char *)&err);
 194                         return CONTROL_FALSE;
 195                 }
 196           /* Everything is currently unimplemented */
 197         default:
 198           return CONTROL_FALSE;
 199         }
 200
 201 }
 202
 203
 204 static void print_format(int lev, const char* str, const AudioStreamBasicDescription *f){
 205     uint32_t flags=(uint32_t) f->mFormatFlags;
 206     ao_msg(MSGT_AO,lev, "%s %7.1fHz %"PRIu32"bit [%c%c%c%c][%"PRIu32"][%"PRIu32"][%"PRIu32"][%"PRIu32"][%"PRIu32"] %s %s %s%s%s%s\n",
 207             str, f->mSampleRate, f->mBitsPerChannel,
 208             (int)(f->mFormatID & 0xff000000) >> 24,
 209             (int)(f->mFormatID & 0x00ff0000) >> 16,
 210             (int)(f->mFormatID & 0x0000ff00) >>  8,
 211             (int)(f->mFormatID & 0x000000ff) >>  0,
 212             f->mFormatFlags, f->mBytesPerPacket,
 213             f->mFramesPerPacket, f->mBytesPerFrame,
 214             f->mChannelsPerFrame,
 215             (flags&kAudioFormatFlagIsFloat) ? "float" : "int",
 216             (flags&kAudioFormatFlagIsBigEndian) ? "BE" : "LE",
 217             (flags&kAudioFormatFlagIsSignedInteger) ? "S" : "U",
 218             (flags&kAudioFormatFlagIsPacked) ? " packed" : "",
 219             (flags&kAudioFormatFlagIsAlignedHigh) ? " aligned" : "",
 220             (flags&kAudioFormatFlagIsNonInterleaved) ? " ni" : "" );
 221 }
 222
 223 static OSStatus GetAudioProperty(AudioObjectID id,
 224                                  AudioObjectPropertySelector selector,
 225                                  UInt32 outSize, void *outData)
 226 {
 227     AudioObjectPropertyAddress property_address;
 228
 229     property_address.mSelector = selector;
 230     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 231     property_address.mElement  = kAudioObjectPropertyElementMaster;
 232
 233     return AudioObjectGetPropertyData(id, &property_address, 0, NULL, &outSize, outData);
 234 }
 235
 236 static UInt32 GetAudioPropertyArray(AudioObjectID id,
 237                                     AudioObjectPropertySelector selector,
 238                                     AudioObjectPropertyScope scope,
 239                                     void **outData)
 240 {
 241     OSStatus err;
 242     AudioObjectPropertyAddress property_address;
 243     UInt32 i_param_size;
 244
 245     property_address.mSelector = selector;
 246     property_address.mScope    = scope;
 247     property_address.mElement  = kAudioObjectPropertyElementMaster;
 248
 249     err = AudioObjectGetPropertyDataSize(id, &property_address, 0, NULL, &i_param_size);
 250
 251     if (err != noErr)
 252         return 0;
 253
 254     *outData = malloc(i_param_size);
 255
 256
 257     err = AudioObjectGetPropertyData(id, &property_address, 0, NULL, &i_param_size, *outData);
 258
 259     if (err != noErr) {
 260         free(*outData);
 261         return 0;
 262     }
 263
 264     return i_param_size;
 265 }
 266
 267 static UInt32 GetGlobalAudioPropertyArray(AudioObjectID id,
 268                                           AudioObjectPropertySelector selector,
 269                                           void **outData)
 270 {
 271     return GetAudioPropertyArray(id, selector, kAudioObjectPropertyScopeGlobal, outData);
 272 }
 273
 274 static OSStatus GetAudioPropertyString(AudioObjectID id,
 275                                        AudioObjectPropertySelector selector,
 276                                        char **outData)
 277 {
 278     OSStatus err;
 279     AudioObjectPropertyAddress property_address;
 280     UInt32 i_param_size;
 281     CFStringRef string;
 282     CFIndex string_length;
 283
 284     property_address.mSelector = selector;
 285     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 286     property_address.mElement  = kAudioObjectPropertyElementMaster;
 287
 288     i_param_size = sizeof(CFStringRef);
 289     err = AudioObjectGetPropertyData(id, &property_address, 0, NULL, &i_param_size, &string);
 290     if (err != noErr)
 291         return err;
 292
 293     string_length = CFStringGetMaximumSizeForEncoding(CFStringGetLength(string),
 294                                                       kCFStringEncodingASCII);
 295     *outData = malloc(string_length + 1);
 296     CFStringGetCString(string, *outData, string_length + 1, kCFStringEncodingASCII);
 297
 298     CFRelease(string);
 299
 300     return err;
 301 }
 302
 303 static OSStatus SetAudioProperty(AudioObjectID id,
 304                                  AudioObjectPropertySelector selector,
 305                                  UInt32 inDataSize, void *inData)
 306 {
 307     AudioObjectPropertyAddress property_address;
 308
 309     property_address.mSelector = selector;
 310     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 311     property_address.mElement  = kAudioObjectPropertyElementMaster;
 312
 313     return AudioObjectSetPropertyData(id, &property_address, 0, NULL, inDataSize, inData);
 314 }
 315
 316 static Boolean IsAudioPropertySettable(AudioObjectID id,
 317                                        AudioObjectPropertySelector selector,
 318                                        Boolean *outData)
 319 {
 320     AudioObjectPropertyAddress property_address;
 321
 322     property_address.mSelector = selector;
 323     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 324     property_address.mElement  = kAudioObjectPropertyElementMaster;
 325
 326     return AudioObjectIsPropertySettable(id, &property_address, outData);
 327 }
 328
 329 static int AudioDeviceSupportsDigital( AudioDeviceID i_dev_id );
 330 static int AudioStreamSupportsDigital( AudioStreamID i_stream_id );
 331 static int OpenSPDIF(void);
 332 static int AudioStreamChangeFormat( AudioStreamID i_stream_id, AudioStreamBasicDescription change_format );
 333 static OSStatus RenderCallbackSPDIF( AudioDeviceID inDevice,
 334                                     const AudioTimeStamp * inNow,
 335                                     const void * inInputData,
 336                                     const AudioTimeStamp * inInputTime,
 337                                     AudioBufferList * outOutputData,
 338                                     const AudioTimeStamp * inOutputTime,
 339                                     void * threadGlobals );
 340 static OSStatus StreamListener( AudioObjectID inObjectID,
 341                                 UInt32 inNumberAddresses,
 342                                 const AudioObjectPropertyAddress inAddresses[],
 343                                 void *inClientData );
 344 static OSStatus DeviceListener( AudioObjectID inObjectID,
 345                                 UInt32 inNumberAddresses,
 346                                 const AudioObjectPropertyAddress inAddresses[],
 347                                 void *inClientData );
 348
 349 static void print_help(void)
 350 {
 351     OSStatus err;
 352     UInt32 i_param_size;
 353     int num_devices;
 354     AudioDeviceID *devids;
 355     char *device_name;
 356
 357     mp_msg(MSGT_AO, MSGL_FATAL,
 358            "\n-ao coreaudio commandline help:\n"
 359            "Example: mplayer -ao coreaudio:device_id=266\n"
 360            "    open Core Audio with output device ID 266.\n"
 361            "\nOptions:\n"
 362            "    device_id\n"
 363            "        ID of output device to use (0 = default device)\n"
 364            "    help\n"
 365            "        This help including list of available devices.\n"
 366            "\n"
 367            "Available output devices:\n");
 368
 369     i_param_size = GetGlobalAudioPropertyArray(kAudioObjectSystemObject, kAudioHardwarePropertyDevices, (void **)&devids);
 370
 371     if (!i_param_size) {
 372         mp_msg(MSGT_AO, MSGL_FATAL, "Failed to get list of output devices.\n");
 373         return;
 374     }
 375
 376     num_devices = i_param_size / sizeof(AudioDeviceID);
 377
 378     for (int i = 0; i < num_devices; ++i) {
 379         err = GetAudioPropertyString(devids[i], kAudioObjectPropertyName, &device_name);
 380
 381         if (err == noErr) {
 382             mp_msg(MSGT_AO, MSGL_FATAL, "%s (id: %"PRIu32")\n", device_name, devids[i]);
 383             free(device_name);
 384         } else
 385             mp_msg(MSGT_AO, MSGL_FATAL, "Unknown (id: %"PRIu32")\n", devids[i]);
 386     }
 387
 388     mp_msg(MSGT_AO, MSGL_FATAL, "\n");
 389
 390     free(devids);
 391 }
 392
 393 static int init(int rate,int channels,int format,int flags)
 394 {
 395 AudioStreamBasicDescription inDesc;
 396 ComponentDescription desc;
 397 Component comp;
 398 AURenderCallbackStruct renderCallback;
 399 OSStatus err;
 400 UInt32 size, maxFrames, b_alive;
 401 char *psz_name;
 402 AudioDeviceID devid_def = 0;
 403 int device_id, display_help = 0;
 404
 405     const opt_t subopts[] = {
 406         {"device_id", OPT_ARG_INT,  &device_id,    NULL},
 407         {"help",      OPT_ARG_BOOL, &display_help, NULL},
 408         {NULL}
 409     };
 410
 411     // set defaults
 412     device_id = 0;
 413
 414     if (subopt_parse(ao_subdevice, subopts) != 0 || display_help) {
 415         print_help();
 416         if (!display_help)
 417             return 0;
 418     }
 419
 420     ao_msg(MSGT_AO,MSGL_V, "init([%dHz][%dch][%s][%d])\n", rate, channels, af_fmt2str_short(format), flags);
 421
 422     ao = calloc(1, sizeof(ao_coreaudio_t));
 423
 424     ao->i_selected_dev = 0;
 425     ao->b_supports_digital = 0;
 426     ao->b_digital = 0;
 427     ao->b_muted = 0;
 428     ao->b_stream_format_changed = 0;
 429     ao->i_hog_pid = -1;
 430     ao->i_stream_id = 0;
 431     ao->i_stream_index = -1;
 432     ao->b_revert = 0;
 433     ao->b_changed_mixing = 0;
 434
 435     if (device_id == 0) {
 436         /* Find the ID of the default Device. */
 437         err = GetAudioProperty(kAudioObjectSystemObject,
 438                                kAudioHardwarePropertyDefaultOutputDevice,
 439                                sizeof(UInt32), &devid_def);
 440         if (err != noErr)
 441         {
 442             ao_msg(MSGT_AO, MSGL_WARN, "could not get default audio device: [%4.4s]\n", (char *)&err);
 443             goto err_out;
 444         }
 445     } else {
 446         devid_def = device_id;
 447     }
 448
 449     /* Retrieve the name of the device. */
 450     err = GetAudioPropertyString(devid_def,
 451                                  kAudioObjectPropertyName,
 452                                  &psz_name);
 453     if (err != noErr)
 454     {
 455         ao_msg(MSGT_AO, MSGL_WARN, "could not get default audio device name: [%4.4s]\n", (char *)&err);
 456         goto err_out;
 457     }
 458
 459     ao_msg(MSGT_AO,MSGL_V, "got audio output device ID: %"PRIu32" Name: %s\n", devid_def, psz_name );
 460
 461     /* Probe whether device support S/PDIF stream output if input is AC3 stream. */
 462     if (AF_FORMAT_IS_AC3(format)) {
 463         if (AudioDeviceSupportsDigital(devid_def))
 464         {
 465             ao->b_supports_digital = 1;
 466         }
 467         ao_msg(MSGT_AO,MSGL_V, "probe default audio output device whether support digital s/pdif output:%d\n", ao->b_supports_digital );
 468     }
 469
 470     free(psz_name);
 471
 472     // Save selected device id
 473     ao->i_selected_dev = devid_def;
 474
 475         // Build Description for the input format
 476         inDesc.mSampleRate=rate;
 477         inDesc.mFormatID=ao->b_supports_digital ? kAudioFormat60958AC3 : kAudioFormatLinearPCM;
 478         inDesc.mChannelsPerFrame=channels;
 479         inDesc.mBitsPerChannel=af_fmt2bits(format);
 480
 481     if((format&AF_FORMAT_POINT_MASK)==AF_FORMAT_F) {
 482         // float
 483                 inDesc.mFormatFlags = kAudioFormatFlagIsFloat|kAudioFormatFlagIsPacked;
 484     }
 485     else if((format&AF_FORMAT_SIGN_MASK)==AF_FORMAT_SI) {
 486         // signed int
 487                 inDesc.mFormatFlags = kAudioFormatFlagIsSignedInteger|kAudioFormatFlagIsPacked;
 488     }
 489     else {
 490         // unsigned int
 491                 inDesc.mFormatFlags = kAudioFormatFlagIsPacked;
 492     }
 493     if ((format & AF_FORMAT_END_MASK) == AF_FORMAT_BE)
 494         inDesc.mFormatFlags |= kAudioFormatFlagIsBigEndian;
 495
 496     inDesc.mFramesPerPacket = 1;
 497     ao->packetSize = inDesc.mBytesPerPacket = inDesc.mBytesPerFrame = inDesc.mFramesPerPacket*channels*(inDesc.mBitsPerChannel/8);
 498     print_format(MSGL_V, "source:",&inDesc);
 499
 500     if (ao->b_supports_digital)
 501     {
 502         b_alive = 1;
 503         err = GetAudioProperty(ao->i_selected_dev,
 504                                kAudioDevicePropertyDeviceIsAlive,
 505                                sizeof(UInt32), &b_alive);
 506         if (err != noErr)
 507             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is alive: [%4.4s]\n", (char *)&err);
 508         if (!b_alive)
 509             ao_msg(MSGT_AO, MSGL_WARN, "device is not alive\n" );
 510
 511         /* S/PDIF output need device in HogMode. */
 512         err = GetAudioProperty(ao->i_selected_dev,
 513                                kAudioDevicePropertyHogMode,
 514                                sizeof(pid_t), &ao->i_hog_pid);
 515         if (err != noErr)
 516         {
 517             /* This is not a fatal error. Some drivers simply don't support this property. */
 518             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is hogged: [%4.4s]\n",
 519                      (char *)&err);
 520             ao->i_hog_pid = -1;
 521         }
 522
 523         if (ao->i_hog_pid != -1 && ao->i_hog_pid != getpid())
 524         {
 525             ao_msg(MSGT_AO, MSGL_WARN, "Selected audio device is exclusively in use by another program.\n" );
 526             goto err_out;
 527         }
 528         ao->stream_format = inDesc;
 529         return OpenSPDIF();
 530     }
 531
 532         /* original analog output code */
 533         desc.componentType = kAudioUnitType_Output;
 534         desc.componentSubType = (device_id == 0) ? kAudioUnitSubType_DefaultOutput : kAudioUnitSubType_HALOutput;
 535         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 536         desc.componentFlags = 0;
 537         desc.componentFlagsMask = 0;
 538
 539         comp = FindNextComponent(NULL, &desc);  //Finds an component that meets the desc spec's
 540         if (comp == NULL) {
 541                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to find Output Unit component\n");
 542                 goto err_out;
 543         }
 544
 545         err = OpenAComponent(comp, &(ao->theOutputUnit));  //gains access to the services provided by the component
 546         if (err) {
 547                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to open Output Unit component: [%4.4s]\n", (char *)&err);
 548                 goto err_out;
 549         }
 550
 551         // Initialize AudioUnit
 552         err = AudioUnitInitialize(ao->theOutputUnit);
 553         if (err) {
 554                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to initialize Output Unit component: [%4.4s]\n", (char *)&err);
 555                 goto err_out1;
 556         }
 557
 558         size =  sizeof(AudioStreamBasicDescription);
 559         err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &inDesc, size);
 560
 561         if (err) {
 562                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the input format: [%4.4s]\n", (char *)&err);
 563                 goto err_out2;
 564         }
 565
 566         size = sizeof(UInt32);
 567         err = AudioUnitGetProperty(ao->theOutputUnit, kAudioDevicePropertyBufferSize, kAudioUnitScope_Input, 0, &maxFrames, &size);
 568
 569         if (err)
 570         {
 571                 ao_msg(MSGT_AO,MSGL_WARN, "AudioUnitGetProperty returned [%4.4s] when getting kAudioDevicePropertyBufferSize\n", (char *)&err);
 572                 goto err_out2;
 573         }
 574
 575         //Set the Current Device to the Default Output Unit.
 576     err = AudioUnitSetProperty(ao->theOutputUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &ao->i_selected_dev, sizeof(ao->i_selected_dev));
 577
 578         ao->chunk_size = maxFrames;//*inDesc.mBytesPerFrame;
 579
 580         ao_data.samplerate = inDesc.mSampleRate;
 581         ao_data.channels = inDesc.mChannelsPerFrame;
 582     ao_data.bps = ao_data.samplerate * inDesc.mBytesPerFrame;
 583     ao_data.outburst = ao->chunk_size;
 584         ao_data.buffersize = ao_data.bps;
 585
 586         ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 587     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 588     ao->buffer = av_fifo_alloc(ao->buffer_len);
 589
 590         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);
 591
 592     renderCallback.inputProc = theRenderProc;
 593     renderCallback.inputProcRefCon = 0;
 594     err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &renderCallback, sizeof(AURenderCallbackStruct));
 595         if (err) {
 596                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the render callback: [%4.4s]\n", (char *)&err);
 597                 goto err_out2;
 598         }
 599
 600         reset();
 601
 602     return CONTROL_OK;
 603
 604 err_out2:
 605     AudioUnitUninitialize(ao->theOutputUnit);
 606 err_out1:
 607     CloseComponent(ao->theOutputUnit);
 608 err_out:
 609     av_fifo_free(ao->buffer);
 610     free(ao);
 611     ao = NULL;
 612     return CONTROL_FALSE;
 613 }
 614
 615 /*****************************************************************************
 616  * Setup a encoded digital stream (SPDIF)
 617  *****************************************************************************/
 618 static int OpenSPDIF(void)
 619 {
 620     OSStatus                    err = noErr;
 621     UInt32                      i_param_size, b_mix = 0;
 622     Boolean                     b_writeable = 0;
 623     AudioStreamID               *p_streams = NULL;
 624     int                         i, i_streams = 0;
 625     AudioObjectPropertyAddress  property_address;
 626
 627     /* Start doing the SPDIF setup process. */
 628     ao->b_digital = 1;
 629
 630     /* Hog the device. */
 631     ao->i_hog_pid = getpid() ;
 632
 633     err = SetAudioProperty(ao->i_selected_dev,
 634                            kAudioDevicePropertyHogMode,
 635                            sizeof(ao->i_hog_pid), &ao->i_hog_pid);
 636     if (err != noErr)
 637     {
 638         ao_msg(MSGT_AO, MSGL_WARN, "failed to set hogmode: [%4.4s]\n", (char *)&err);
 639         ao->i_hog_pid = -1;
 640         goto err_out;
 641     }
 642
 643     /* Set mixable to false if we are allowed to. */
 644     err = IsAudioPropertySettable(ao->i_selected_dev,
 645                                   kAudioDevicePropertySupportsMixing,
 646                                   &b_writeable);
 647     err = GetAudioProperty(ao->i_selected_dev,
 648                            kAudioDevicePropertySupportsMixing,
 649                            sizeof(UInt32), &b_mix);
 650     if (err != noErr && b_writeable)
 651     {
 652         b_mix = 0;
 653         err = SetAudioProperty(ao->i_selected_dev,
 654                                kAudioDevicePropertySupportsMixing,
 655                                sizeof(UInt32), &b_mix);
 656         ao->b_changed_mixing = 1;
 657     }
 658     if (err != noErr)
 659     {
 660         ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
 661         goto err_out;
 662     }
 663
 664     /* Get a list of all the streams on this device. */
 665     i_param_size = GetAudioPropertyArray(ao->i_selected_dev,
 666                                          kAudioDevicePropertyStreams,
 667                                          kAudioDevicePropertyScopeOutput,
 668                                          (void **)&p_streams);
 669
 670     if (!i_param_size) {
 671         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams.\n");
 672         goto err_out;
 673     }
 674
 675     i_streams = i_param_size / sizeof(AudioStreamID);
 676
 677     ao_msg(MSGT_AO, MSGL_V, "current device stream number: %d\n", i_streams);
 678
 679     for (i = 0; i < i_streams && ao->i_stream_index < 0; ++i)
 680     {
 681         /* Find a stream with a cac3 stream. */
 682         AudioStreamBasicDescription *p_format_list = NULL;
 683         int i_formats = 0, j = 0, b_digital = 0;
 684
 685         i_param_size = GetGlobalAudioPropertyArray(p_streams[i],
 686                                                    kAudioStreamPropertyPhysicalFormats,
 687                                                    (void **)&p_format_list);
 688
 689         if (!i_param_size) {
 690             ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streamformats.\n");
 691             continue;
 692         }
 693
 694         i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 695
 696         /* Check if one of the supported formats is a digital format. */
 697         for (j = 0; j < i_formats; ++j)
 698         {
 699             if (p_format_list[j].mFormatID == 'IAC3' ||
 700                   p_format_list[j].mFormatID == kAudioFormat60958AC3)
 701             {
 702                 b_digital = 1;
 703                 break;
 704             }
 705         }
 706
 707         if (b_digital)
 708         {
 709             /* If this stream supports a digital (cac3) format, then set it. */
 710             int i_requested_rate_format = -1;
 711             int i_current_rate_format = -1;
 712             int i_backup_rate_format = -1;
 713
 714             ao->i_stream_id = p_streams[i];
 715             ao->i_stream_index = i;
 716
 717             if (ao->b_revert == 0)
 718             {
 719                 /* Retrieve the original format of this stream first if not done so already. */
 720                 err = GetAudioProperty(ao->i_stream_id,
 721                                        kAudioStreamPropertyPhysicalFormat,
 722                                        sizeof(ao->sfmt_revert), &ao->sfmt_revert);
 723                 if (err != noErr)
 724                 {
 725                     ao_msg(MSGT_AO, MSGL_WARN, "could not retrieve the original streamformat: [%4.4s]\n", (char *)&err);
 726                     if (p_format_list) free(p_format_list);
 727                     continue;
 728                 }
 729                 ao->b_revert = 1;
 730             }
 731
 732             for (j = 0; j < i_formats; ++j)
 733                 if (p_format_list[j].mFormatID == 'IAC3' ||
 734                       p_format_list[j].mFormatID == kAudioFormat60958AC3)
 735                 {
 736                     if (p_format_list[j].mSampleRate == ao->stream_format.mSampleRate)
 737                     {
 738                         i_requested_rate_format = j;
 739                         break;
 740                     }
 741                     if (p_format_list[j].mSampleRate == ao->sfmt_revert.mSampleRate)
 742                         i_current_rate_format = j;
 743                     else if (i_backup_rate_format < 0 || p_format_list[j].mSampleRate > p_format_list[i_backup_rate_format].mSampleRate)
 744                         i_backup_rate_format = j;
 745                 }
 746
 747             if (i_requested_rate_format >= 0) /* We prefer to output at the samplerate of the original audio. */
 748                 ao->stream_format = p_format_list[i_requested_rate_format];
 749             else if (i_current_rate_format >= 0) /* If not possible, we will try to use the current samplerate of the device. */
 750                 ao->stream_format = p_format_list[i_current_rate_format];
 751             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). */
 752         }
 753         if (p_format_list) free(p_format_list);
 754     }
 755     if (p_streams) free(p_streams);
 756
 757     if (ao->i_stream_index < 0)
 758     {
 759         ao_msg(MSGT_AO, MSGL_WARN, "can not find any digital output stream format when OpenSPDIF().\n");
 760         goto err_out;
 761     }
 762
 763     print_format(MSGL_V, "original stream format:", &ao->sfmt_revert);
 764
 765     if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
 766         goto err_out;
 767
 768     property_address.mSelector = kAudioDevicePropertyDeviceHasChanged;
 769     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 770     property_address.mElement  = kAudioObjectPropertyElementMaster;
 771
 772     err = AudioObjectAddPropertyListener(ao->i_selected_dev,
 773                                          &property_address,
 774                                          DeviceListener,
 775                                          NULL);
 776     if (err != noErr)
 777         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddPropertyListener for kAudioDevicePropertyDeviceHasChanged failed: [%4.4s]\n", (char *)&err);
 778
 779
 780     /* FIXME: If output stream is not native byte-order, we need change endian somewhere. */
 781     /*        Although there's no such case reported.                                     */
 782 #if HAVE_BIGENDIAN
 783     if (!(ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian))
 784 #else
 785     if (ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian)
 786 #endif
 787         ao_msg(MSGT_AO, MSGL_WARN, "output stream has a no-native byte-order, digital output may failed.\n");
 788
 789     /* For ac3/dts, just use packet size 6144 bytes as chunk size. */
 790     ao->chunk_size = ao->stream_format.mBytesPerPacket;
 791
 792     ao_data.samplerate = ao->stream_format.mSampleRate;
 793     ao_data.channels = ao->stream_format.mChannelsPerFrame;
 794     ao_data.bps = ao_data.samplerate * (ao->stream_format.mBytesPerPacket/ao->stream_format.mFramesPerPacket);
 795     ao_data.outburst = ao->chunk_size;
 796     ao_data.buffersize = ao_data.bps;
 797
 798     ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 799     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 800     ao->buffer = av_fifo_alloc(ao->buffer_len);
 801
 802     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);
 803
 804
 805     /* Create IOProc callback. */
 806     err = AudioDeviceCreateIOProcID(ao->i_selected_dev,
 807                                     (AudioDeviceIOProc)RenderCallbackSPDIF,
 808                                     (void *)ao,
 809                                     &ao->renderCallback);
 810
 811     if (err != noErr || ao->renderCallback == NULL)
 812     {
 813         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddIOProc failed: [%4.4s]\n", (char *)&err);
 814         goto err_out1;
 815     }
 816
 817     reset();
 818
 819     return CONTROL_TRUE;
 820
 821 err_out1:
 822     if (ao->b_revert)
 823         AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
 824 err_out:
 825     if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
 826     {
 827         int b_mix = 1;
 828         err = SetAudioProperty(ao->i_selected_dev,
 829                                kAudioDevicePropertySupportsMixing,
 830                                sizeof(int), &b_mix);
 831         if (err != noErr)
 832             ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n",
 833                    (char *)&err);
 834     }
 835     if (ao->i_hog_pid == getpid())
 836     {
 837         ao->i_hog_pid = -1;
 838         err = SetAudioProperty(ao->i_selected_dev,
 839                                kAudioDevicePropertyHogMode,
 840                                sizeof(ao->i_hog_pid), &ao->i_hog_pid);
 841         if (err != noErr)
 842             ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n",
 843                    (char *)&err);
 844     }
 845     av_fifo_free(ao->buffer);
 846     free(ao);
 847     ao = NULL;
 848     return CONTROL_FALSE;
 849 }
 850
 851 /*****************************************************************************
 852  * AudioDeviceSupportsDigital: Check i_dev_id for digital stream support.
 853  *****************************************************************************/
 854 static int AudioDeviceSupportsDigital( AudioDeviceID i_dev_id )
 855 {
 856     UInt32                      i_param_size = 0;
 857     AudioStreamID               *p_streams = NULL;
 858     int                         i = 0, i_streams = 0;
 859     int                         b_return = CONTROL_FALSE;
 860
 861     /* Retrieve all the output streams. */
 862     i_param_size = GetAudioPropertyArray(i_dev_id,
 863                                          kAudioDevicePropertyStreams,
 864                                          kAudioDevicePropertyScopeOutput,
 865                                          (void **)&p_streams);
 866
 867     if (!i_param_size) {
 868         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams.\n");
 869         return CONTROL_FALSE;
 870     }
 871
 872     i_streams = i_param_size / sizeof(AudioStreamID);
 873
 874     for (i = 0; i < i_streams; ++i)
 875     {
 876         if (AudioStreamSupportsDigital(p_streams[i]))
 877             b_return = CONTROL_OK;
 878     }
 879
 880     free(p_streams);
 881     return b_return;
 882 }
 883
 884 /*****************************************************************************
 885  * AudioStreamSupportsDigital: Check i_stream_id for digital stream support.
 886  *****************************************************************************/
 887 static int AudioStreamSupportsDigital( AudioStreamID i_stream_id )
 888 {
 889     UInt32 i_param_size;
 890     AudioStreamBasicDescription *p_format_list = NULL;
 891     int i, i_formats, b_return = CONTROL_FALSE;
 892
 893     /* Retrieve all the stream formats supported by each output stream. */
 894     i_param_size = GetGlobalAudioPropertyArray(i_stream_id,
 895                                                kAudioStreamPropertyPhysicalFormats,
 896                                                (void **)&p_format_list);
 897
 898     if (!i_param_size) {
 899         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streamformats.\n");
 900         return CONTROL_FALSE;
 901     }
 902
 903     i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 904
 905     for (i = 0; i < i_formats; ++i)
 906     {
 907         print_format(MSGL_V, "supported format:", &p_format_list[i]);
 908
 909         if (p_format_list[i].mFormatID == 'IAC3' ||
 910                   p_format_list[i].mFormatID == kAudioFormat60958AC3)
 911             b_return = CONTROL_OK;
 912     }
 913
 914     free(p_format_list);
 915     return b_return;
 916 }
 917
 918 /*****************************************************************************
 919  * AudioStreamChangeFormat: Change i_stream_id to change_format
 920  *****************************************************************************/
 921 static int AudioStreamChangeFormat( AudioStreamID i_stream_id, AudioStreamBasicDescription change_format )
 922 {
 923     OSStatus err = noErr;
 924     int i;
 925     AudioObjectPropertyAddress property_address;
 926
 927     static volatile int stream_format_changed;
 928     stream_format_changed = 0;
 929
 930     print_format(MSGL_V, "setting stream format:", &change_format);
 931
 932     /* Install the callback. */
 933     property_address.mSelector = kAudioStreamPropertyPhysicalFormat;
 934     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 935     property_address.mElement  = kAudioObjectPropertyElementMaster;
 936
 937     err = AudioObjectAddPropertyListener(i_stream_id,
 938                                          &property_address,
 939                                          StreamListener,
 940                                          (void *)&stream_format_changed);
 941     if (err != noErr)
 942     {
 943         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamAddPropertyListener failed: [%4.4s]\n", (char *)&err);
 944         return CONTROL_FALSE;
 945     }
 946
 947     /* Change the format. */
 948     err = SetAudioProperty(i_stream_id,
 949                            kAudioStreamPropertyPhysicalFormat,
 950                            sizeof(AudioStreamBasicDescription), &change_format);
 951     if (err != noErr)
 952     {
 953         ao_msg(MSGT_AO, MSGL_WARN, "could not set the stream format: [%4.4s]\n", (char *)&err);
 954         return CONTROL_FALSE;
 955     }
 956
 957     /* The AudioStreamSetProperty is not only asynchronious,
 958      * it is also not Atomic, in its behaviour.
 959      * Therefore we check 5 times before we really give up.
 960      * FIXME: failing isn't actually implemented yet. */
 961     for (i = 0; i < 5; ++i)
 962     {
 963         AudioStreamBasicDescription actual_format;
 964         int j;
 965         for (j = 0; !stream_format_changed && j < 50; ++j)
 966             usec_sleep(10000);
 967         if (stream_format_changed)
 968             stream_format_changed = 0;
 969         else
 970             ao_msg(MSGT_AO, MSGL_V, "reached timeout\n" );
 971
 972         err = GetAudioProperty(i_stream_id,
 973                                kAudioStreamPropertyPhysicalFormat,
 974                                sizeof(AudioStreamBasicDescription), &actual_format);
 975
 976         print_format(MSGL_V, "actual format in use:", &actual_format);
 977         if (actual_format.mSampleRate == change_format.mSampleRate &&
 978             actual_format.mFormatID == change_format.mFormatID &&
 979             actual_format.mFramesPerPacket == change_format.mFramesPerPacket)
 980         {
 981             /* The right format is now active. */
 982             break;
 983         }
 984         /* We need to check again. */
 985     }
 986
 987     /* Removing the property listener. */
 988     err = AudioObjectRemovePropertyListener(i_stream_id,
 989                                             &property_address,
 990                                             StreamListener,
 991                                             (void *)&stream_format_changed);
 992     if (err != noErr)
 993     {
 994         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamRemovePropertyListener failed: [%4.4s]\n", (char *)&err);
 995         return CONTROL_FALSE;
 996     }
 997
 998     return CONTROL_TRUE;
 999 }
1000
1001 /*****************************************************************************
1002  * RenderCallbackSPDIF: callback for SPDIF audio output
1003  *****************************************************************************/
1004 static OSStatus RenderCallbackSPDIF( AudioDeviceID inDevice,
1005                                     const AudioTimeStamp * inNow,
1006                                     const void * inInputData,
1007                                     const AudioTimeStamp * inInputTime,
1008                                     AudioBufferList * outOutputData,
1009                                     const AudioTimeStamp * inOutputTime,
1010                                     void * threadGlobals )
1011 {
1012     int amt = av_fifo_size(ao->buffer);
1013     int req = outOutputData->mBuffers[ao->i_stream_index].mDataByteSize;
1014
1015     if (amt > req)
1016         amt = req;
1017     if (amt)
1018         read_buffer(ao->b_muted ? NULL : (unsigned char *)outOutputData->mBuffers[ao->i_stream_index].mData, amt);
1019
1020     return noErr;
1021 }
1022
1023
1024 static int play(void* output_samples,int num_bytes,int flags)
1025 {
1026     int wrote, b_digital;
1027     SInt32 exit_reason;
1028
1029     // Check whether we need to reset the digital output stream.
1030     if (ao->b_digital && ao->b_stream_format_changed)
1031     {
1032         ao->b_stream_format_changed = 0;
1033         b_digital = AudioStreamSupportsDigital(ao->i_stream_id);
1034         if (b_digital)
1035         {
1036             /* Current stream support digital format output, let's set it. */
1037             ao_msg(MSGT_AO, MSGL_V, "detected current stream support digital, try to restore digital output...\n");
1038
1039             if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
1040             {
1041                 ao_msg(MSGT_AO, MSGL_WARN, "restore digital output failed.\n");
1042             }
1043             else
1044             {
1045                 ao_msg(MSGT_AO, MSGL_WARN, "restore digital output succeed.\n");
1046                 reset();
1047             }
1048         }
1049         else
1050             ao_msg(MSGT_AO, MSGL_V, "detected current stream do not support digital.\n");
1051     }
1052
1053     wrote=write_buffer(output_samples, num_bytes);
1054     audio_resume();
1055
1056     do {
1057         exit_reason = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.01, true);
1058     } while (exit_reason == kCFRunLoopRunHandledSource);
1059
1060     return wrote;
1061 }
1062
1063 /* set variables and buffer to initial state */
1064 static void reset(void)
1065 {
1066   audio_pause();
1067   av_fifo_reset(ao->buffer);
1068 }
1069
1070
1071 /* return available space */
1072 static int get_space(void)
1073 {
1074   return ao->buffer_len - av_fifo_size(ao->buffer);
1075 }
1076
1077
1078 /* return delay until audio is played */
1079 static float get_delay(void)
1080 {
1081   // inaccurate, should also contain the data buffered e.g. by the OS
1082   return (float)av_fifo_size(ao->buffer)/(float)ao_data.bps;
1083 }
1084
1085
1086 /* unload plugin and deregister from coreaudio */
1087 static void uninit(int immed)
1088 {
1089   OSStatus            err = noErr;
1090
1091   if (!immed) {
1092     long long timeleft=(1000000LL*av_fifo_size(ao->buffer))/ao_data.bps;
1093     ao_msg(MSGT_AO,MSGL_DBG2, "%d bytes left @%d bps (%d usec)\n", av_fifo_size(ao->buffer), ao_data.bps, (int)timeleft);
1094     usec_sleep((int)timeleft);
1095   }
1096
1097   if (!ao->b_digital) {
1098       AudioOutputUnitStop(ao->theOutputUnit);
1099       AudioUnitUninitialize(ao->theOutputUnit);
1100       CloseComponent(ao->theOutputUnit);
1101   }
1102   else {
1103       /* Stop device. */
1104       err = AudioDeviceStop(ao->i_selected_dev, ao->renderCallback);
1105       if (err != noErr)
1106           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1107
1108       /* Remove IOProc callback. */
1109       err = AudioDeviceDestroyIOProcID(ao->i_selected_dev, ao->renderCallback);
1110       if (err != noErr)
1111           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceRemoveIOProc failed: [%4.4s]\n", (char *)&err);
1112
1113       if (ao->b_revert)
1114           AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
1115
1116       if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
1117       {
1118           UInt32 b_mix;
1119           Boolean b_writeable;
1120           /* Revert mixable to true if we are allowed to. */
1121           err = IsAudioPropertySettable(ao->i_selected_dev,
1122                                         kAudioDevicePropertySupportsMixing,
1123                                         &b_writeable);
1124           err = GetAudioProperty(ao->i_selected_dev,
1125                                  kAudioDevicePropertySupportsMixing,
1126                                  sizeof(UInt32), &b_mix);
1127           if (err != noErr && b_writeable)
1128           {
1129               b_mix = 1;
1130               err = SetAudioProperty(ao->i_selected_dev,
1131                                      kAudioDevicePropertySupportsMixing,
1132                                      sizeof(UInt32), &b_mix);
1133           }
1134           if (err != noErr)
1135               ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
1136       }
1137       if (ao->i_hog_pid == getpid())
1138       {
1139           ao->i_hog_pid = -1;
1140           err = SetAudioProperty(ao->i_selected_dev,
1141                                  kAudioDevicePropertyHogMode,
1142                                  sizeof(ao->i_hog_pid), &ao->i_hog_pid);
1143           if (err != noErr) ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n", (char *)&err);
1144       }
1145   }
1146
1147   av_fifo_free(ao->buffer);
1148   free(ao);
1149   ao = NULL;
1150 }
1151
1152
1153 /* stop playing, keep buffers (for pause) */
1154 static void audio_pause(void)
1155 {
1156     OSErr err=noErr;
1157
1158     /* Stop callback. */
1159     if (!ao->b_digital)
1160     {
1161         err=AudioOutputUnitStop(ao->theOutputUnit);
1162         if (err != noErr)
1163             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStop returned [%4.4s]\n", (char *)&err);
1164     }
1165     else
1166     {
1167         err = AudioDeviceStop(ao->i_selected_dev, ao->renderCallback);
1168         if (err != noErr)
1169             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1170     }
1171     ao->paused = 1;
1172 }
1173
1174
1175 /* resume playing, after audio_pause() */
1176 static void audio_resume(void)
1177 {
1178     OSErr err=noErr;
1179
1180     if (!ao->paused)
1181         return;
1182
1183     /* Start callback. */
1184     if (!ao->b_digital)
1185     {
1186         err = AudioOutputUnitStart(ao->theOutputUnit);
1187         if (err != noErr)
1188             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStart returned [%4.4s]\n", (char *)&err);
1189     }
1190     else
1191     {
1192         err = AudioDeviceStart(ao->i_selected_dev, ao->renderCallback);
1193         if (err != noErr)
1194             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStart failed: [%4.4s]\n", (char *)&err);
1195     }
1196     ao->paused = 0;
1197 }
1198
1199 /*****************************************************************************
1200  * StreamListener
1201  *****************************************************************************/
1202 static OSStatus StreamListener( AudioObjectID inObjectID,
1203                                 UInt32 inNumberAddresses,
1204                                 const AudioObjectPropertyAddress inAddresses[],
1205                                 void *inClientData )
1206 {
1207     for (int i=0; i < inNumberAddresses; ++i)
1208     {
1209         if (inAddresses[i].mSelector == kAudioStreamPropertyPhysicalFormat) {
1210             ao_msg(MSGT_AO, MSGL_WARN, "got notify kAudioStreamPropertyPhysicalFormat changed.\n");
1211             if (inClientData)
1212                 *(volatile int *)inClientData = 1;
1213             break;
1214         }
1215     }
1216     return noErr;
1217 }
1218
1219 static OSStatus DeviceListener( AudioObjectID inObjectID,
1220                                 UInt32 inNumberAddresses,
1221                                 const AudioObjectPropertyAddress inAddresses[],
1222                                 void *inClientData )
1223 {
1224     for (int i=0; i < inNumberAddresses; ++i)
1225     {
1226         if (inAddresses[i].mSelector == kAudioDevicePropertyDeviceHasChanged) {
1227             ao_msg(MSGT_AO, MSGL_WARN, "got notify kAudioDevicePropertyDeviceHasChanged.\n");
1228             ao->b_stream_format_changed = 1;
1229             break;
1230         }
1231     }
1232     return noErr;
1233 }