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,
 468                "probe default audio output device about support for digital s/pdif output: %d\n",
 469                ao->b_supports_digital );
 470     }
 471
 472     free(psz_name);
 473
 474     // Save selected device id
 475     ao->i_selected_dev = devid_def;
 476
 477         // Build Description for the input format
 478         inDesc.mSampleRate=rate;
 479         inDesc.mFormatID=ao->b_supports_digital ? kAudioFormat60958AC3 : kAudioFormatLinearPCM;
 480         inDesc.mChannelsPerFrame=channels;
 481         inDesc.mBitsPerChannel=af_fmt2bits(format);
 482
 483     if((format&AF_FORMAT_POINT_MASK)==AF_FORMAT_F) {
 484         // float
 485                 inDesc.mFormatFlags = kAudioFormatFlagIsFloat|kAudioFormatFlagIsPacked;
 486     }
 487     else if((format&AF_FORMAT_SIGN_MASK)==AF_FORMAT_SI) {
 488         // signed int
 489                 inDesc.mFormatFlags = kAudioFormatFlagIsSignedInteger|kAudioFormatFlagIsPacked;
 490     }
 491     else {
 492         // unsigned int
 493                 inDesc.mFormatFlags = kAudioFormatFlagIsPacked;
 494     }
 495     if ((format & AF_FORMAT_END_MASK) == AF_FORMAT_BE)
 496         inDesc.mFormatFlags |= kAudioFormatFlagIsBigEndian;
 497
 498     inDesc.mFramesPerPacket = 1;
 499     ao->packetSize = inDesc.mBytesPerPacket = inDesc.mBytesPerFrame = inDesc.mFramesPerPacket*channels*(inDesc.mBitsPerChannel/8);
 500     print_format(MSGL_V, "source:",&inDesc);
 501
 502     if (ao->b_supports_digital)
 503     {
 504         b_alive = 1;
 505         err = GetAudioProperty(ao->i_selected_dev,
 506                                kAudioDevicePropertyDeviceIsAlive,
 507                                sizeof(UInt32), &b_alive);
 508         if (err != noErr)
 509             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is alive: [%4.4s]\n", (char *)&err);
 510         if (!b_alive)
 511             ao_msg(MSGT_AO, MSGL_WARN, "device is not alive\n" );
 512
 513         /* S/PDIF output need device in HogMode. */
 514         err = GetAudioProperty(ao->i_selected_dev,
 515                                kAudioDevicePropertyHogMode,
 516                                sizeof(pid_t), &ao->i_hog_pid);
 517         if (err != noErr)
 518         {
 519             /* This is not a fatal error. Some drivers simply don't support this property. */
 520             ao_msg(MSGT_AO, MSGL_WARN, "could not check whether device is hogged: [%4.4s]\n",
 521                      (char *)&err);
 522             ao->i_hog_pid = -1;
 523         }
 524
 525         if (ao->i_hog_pid != -1 && ao->i_hog_pid != getpid())
 526         {
 527             ao_msg(MSGT_AO, MSGL_WARN, "Selected audio device is exclusively in use by another program.\n" );
 528             goto err_out;
 529         }
 530         ao->stream_format = inDesc;
 531         return OpenSPDIF();
 532     }
 533
 534         /* original analog output code */
 535         desc.componentType = kAudioUnitType_Output;
 536         desc.componentSubType = (device_id == 0) ? kAudioUnitSubType_DefaultOutput : kAudioUnitSubType_HALOutput;
 537         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 538         desc.componentFlags = 0;
 539         desc.componentFlagsMask = 0;
 540
 541         comp = FindNextComponent(NULL, &desc);  //Finds an component that meets the desc spec's
 542         if (comp == NULL) {
 543                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to find Output Unit component\n");
 544                 goto err_out;
 545         }
 546
 547         err = OpenAComponent(comp, &(ao->theOutputUnit));  //gains access to the services provided by the component
 548         if (err) {
 549                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to open Output Unit component: [%4.4s]\n", (char *)&err);
 550                 goto err_out;
 551         }
 552
 553         // Initialize AudioUnit
 554         err = AudioUnitInitialize(ao->theOutputUnit);
 555         if (err) {
 556                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to initialize Output Unit component: [%4.4s]\n", (char *)&err);
 557                 goto err_out1;
 558         }
 559
 560         size =  sizeof(AudioStreamBasicDescription);
 561         err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &inDesc, size);
 562
 563         if (err) {
 564                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the input format: [%4.4s]\n", (char *)&err);
 565                 goto err_out2;
 566         }
 567
 568         size = sizeof(UInt32);
 569         err = AudioUnitGetProperty(ao->theOutputUnit, kAudioDevicePropertyBufferSize, kAudioUnitScope_Input, 0, &maxFrames, &size);
 570
 571         if (err)
 572         {
 573                 ao_msg(MSGT_AO,MSGL_WARN, "AudioUnitGetProperty returned [%4.4s] when getting kAudioDevicePropertyBufferSize\n", (char *)&err);
 574                 goto err_out2;
 575         }
 576
 577         //Set the Current Device to the Default Output Unit.
 578     err = AudioUnitSetProperty(ao->theOutputUnit, kAudioOutputUnitProperty_CurrentDevice, kAudioUnitScope_Global, 0, &ao->i_selected_dev, sizeof(ao->i_selected_dev));
 579
 580         ao->chunk_size = maxFrames;//*inDesc.mBytesPerFrame;
 581
 582         ao_data.samplerate = inDesc.mSampleRate;
 583         ao_data.channels = inDesc.mChannelsPerFrame;
 584     ao_data.bps = ao_data.samplerate * inDesc.mBytesPerFrame;
 585     ao_data.outburst = ao->chunk_size;
 586         ao_data.buffersize = ao_data.bps;
 587
 588         ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 589     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 590     ao->buffer = av_fifo_alloc(ao->buffer_len);
 591
 592         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);
 593
 594     renderCallback.inputProc = theRenderProc;
 595     renderCallback.inputProcRefCon = 0;
 596     err = AudioUnitSetProperty(ao->theOutputUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &renderCallback, sizeof(AURenderCallbackStruct));
 597         if (err) {
 598                 ao_msg(MSGT_AO, MSGL_WARN, "Unable to set the render callback: [%4.4s]\n", (char *)&err);
 599                 goto err_out2;
 600         }
 601
 602         reset();
 603
 604     return CONTROL_OK;
 605
 606 err_out2:
 607     AudioUnitUninitialize(ao->theOutputUnit);
 608 err_out1:
 609     CloseComponent(ao->theOutputUnit);
 610 err_out:
 611     av_fifo_free(ao->buffer);
 612     free(ao);
 613     ao = NULL;
 614     return CONTROL_FALSE;
 615 }
 616
 617 /*****************************************************************************
 618  * Setup a encoded digital stream (SPDIF)
 619  *****************************************************************************/
 620 static int OpenSPDIF(void)
 621 {
 622     OSStatus                    err = noErr;
 623     UInt32                      i_param_size, b_mix = 0;
 624     Boolean                     b_writeable = 0;
 625     AudioStreamID               *p_streams = NULL;
 626     int                         i, i_streams = 0;
 627     AudioObjectPropertyAddress  property_address;
 628
 629     /* Start doing the SPDIF setup process. */
 630     ao->b_digital = 1;
 631
 632     /* Hog the device. */
 633     ao->i_hog_pid = getpid() ;
 634
 635     err = SetAudioProperty(ao->i_selected_dev,
 636                            kAudioDevicePropertyHogMode,
 637                            sizeof(ao->i_hog_pid), &ao->i_hog_pid);
 638     if (err != noErr)
 639     {
 640         ao_msg(MSGT_AO, MSGL_WARN, "failed to set hogmode: [%4.4s]\n", (char *)&err);
 641         ao->i_hog_pid = -1;
 642         goto err_out;
 643     }
 644
 645     /* Set mixable to false if we are allowed to. */
 646     err = IsAudioPropertySettable(ao->i_selected_dev,
 647                                   kAudioDevicePropertySupportsMixing,
 648                                   &b_writeable);
 649     err = GetAudioProperty(ao->i_selected_dev,
 650                            kAudioDevicePropertySupportsMixing,
 651                            sizeof(UInt32), &b_mix);
 652     if (err != noErr && b_writeable)
 653     {
 654         b_mix = 0;
 655         err = SetAudioProperty(ao->i_selected_dev,
 656                                kAudioDevicePropertySupportsMixing,
 657                                sizeof(UInt32), &b_mix);
 658         ao->b_changed_mixing = 1;
 659     }
 660     if (err != noErr)
 661     {
 662         ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
 663         goto err_out;
 664     }
 665
 666     /* Get a list of all the streams on this device. */
 667     i_param_size = GetAudioPropertyArray(ao->i_selected_dev,
 668                                          kAudioDevicePropertyStreams,
 669                                          kAudioDevicePropertyScopeOutput,
 670                                          (void **)&p_streams);
 671
 672     if (!i_param_size) {
 673         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams.\n");
 674         goto err_out;
 675     }
 676
 677     i_streams = i_param_size / sizeof(AudioStreamID);
 678
 679     ao_msg(MSGT_AO, MSGL_V, "current device stream number: %d\n", i_streams);
 680
 681     for (i = 0; i < i_streams && ao->i_stream_index < 0; ++i)
 682     {
 683         /* Find a stream with a cac3 stream. */
 684         AudioStreamBasicDescription *p_format_list = NULL;
 685         int i_formats = 0, j = 0, b_digital = 0;
 686
 687         i_param_size = GetGlobalAudioPropertyArray(p_streams[i],
 688                                                    kAudioStreamPropertyPhysicalFormats,
 689                                                    (void **)&p_format_list);
 690
 691         if (!i_param_size) {
 692             ao_msg(MSGT_AO, MSGL_WARN,
 693                    "Could not get number of stream formats.\n");
 694             continue;
 695         }
 696
 697         i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 698
 699         /* Check if one of the supported formats is a digital format. */
 700         for (j = 0; j < i_formats; ++j)
 701         {
 702             if (p_format_list[j].mFormatID == 'IAC3' ||
 703                   p_format_list[j].mFormatID == kAudioFormat60958AC3)
 704             {
 705                 b_digital = 1;
 706                 break;
 707             }
 708         }
 709
 710         if (b_digital)
 711         {
 712             /* If this stream supports a digital (cac3) format, then set it. */
 713             int i_requested_rate_format = -1;
 714             int i_current_rate_format = -1;
 715             int i_backup_rate_format = -1;
 716
 717             ao->i_stream_id = p_streams[i];
 718             ao->i_stream_index = i;
 719
 720             if (ao->b_revert == 0)
 721             {
 722                 /* Retrieve the original format of this stream first if not done so already. */
 723                 err = GetAudioProperty(ao->i_stream_id,
 724                                        kAudioStreamPropertyPhysicalFormat,
 725                                        sizeof(ao->sfmt_revert), &ao->sfmt_revert);
 726                 if (err != noErr)
 727                 {
 728                     ao_msg(MSGT_AO, MSGL_WARN,
 729                            "Could not retrieve the original stream format: [%4.4s]\n",
 730                            (char *)&err);
 731                     free(p_format_list);
 732                     continue;
 733                 }
 734                 ao->b_revert = 1;
 735             }
 736
 737             for (j = 0; j < i_formats; ++j)
 738                 if (p_format_list[j].mFormatID == 'IAC3' ||
 739                       p_format_list[j].mFormatID == kAudioFormat60958AC3)
 740                 {
 741                     if (p_format_list[j].mSampleRate == ao->stream_format.mSampleRate)
 742                     {
 743                         i_requested_rate_format = j;
 744                         break;
 745                     }
 746                     if (p_format_list[j].mSampleRate == ao->sfmt_revert.mSampleRate)
 747                         i_current_rate_format = j;
 748                     else if (i_backup_rate_format < 0 || p_format_list[j].mSampleRate > p_format_list[i_backup_rate_format].mSampleRate)
 749                         i_backup_rate_format = j;
 750                 }
 751
 752             if (i_requested_rate_format >= 0) /* We prefer to output at the samplerate of the original audio. */
 753                 ao->stream_format = p_format_list[i_requested_rate_format];
 754             else if (i_current_rate_format >= 0) /* If not possible, we will try to use the current samplerate of the device. */
 755                 ao->stream_format = p_format_list[i_current_rate_format];
 756             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). */
 757         }
 758         free(p_format_list);
 759     }
 760     free(p_streams);
 761
 762     if (ao->i_stream_index < 0)
 763     {
 764         ao_msg(MSGT_AO, MSGL_WARN,
 765                "Cannot find any digital output stream format when OpenSPDIF().\n");
 766         goto err_out;
 767     }
 768
 769     print_format(MSGL_V, "original stream format:", &ao->sfmt_revert);
 770
 771     if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
 772         goto err_out;
 773
 774     property_address.mSelector = kAudioDevicePropertyDeviceHasChanged;
 775     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 776     property_address.mElement  = kAudioObjectPropertyElementMaster;
 777
 778     err = AudioObjectAddPropertyListener(ao->i_selected_dev,
 779                                          &property_address,
 780                                          DeviceListener,
 781                                          NULL);
 782     if (err != noErr)
 783         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddPropertyListener for kAudioDevicePropertyDeviceHasChanged failed: [%4.4s]\n", (char *)&err);
 784
 785
 786     /* FIXME: If output stream is not native byte-order, we need change endian somewhere. */
 787     /*        Although there's no such case reported.                                     */
 788 #if HAVE_BIGENDIAN
 789     if (!(ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian))
 790 #else
 791     /* tell mplayer that we need a byteswap on AC3 streams, */
 792     if (ao->stream_format.mFormatID & kAudioFormat60958AC3)
 793         ao_data.format = AF_FORMAT_AC3_LE;
 794
 795     if (ao->stream_format.mFormatFlags & kAudioFormatFlagIsBigEndian)
 796 #endif
 797         ao_msg(MSGT_AO, MSGL_WARN,
 798                "Output stream has non-native byte order, digital output may fail.\n");
 799
 800     /* For ac3/dts, just use packet size 6144 bytes as chunk size. */
 801     ao->chunk_size = ao->stream_format.mBytesPerPacket;
 802
 803     ao_data.samplerate = ao->stream_format.mSampleRate;
 804     ao_data.channels = ao->stream_format.mChannelsPerFrame;
 805     ao_data.bps = ao_data.samplerate * (ao->stream_format.mBytesPerPacket/ao->stream_format.mFramesPerPacket);
 806     ao_data.outburst = ao->chunk_size;
 807     ao_data.buffersize = ao_data.bps;
 808
 809     ao->num_chunks = (ao_data.bps+ao->chunk_size-1)/ao->chunk_size;
 810     ao->buffer_len = ao->num_chunks * ao->chunk_size;
 811     ao->buffer = av_fifo_alloc(ao->buffer_len);
 812
 813     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);
 814
 815
 816     /* Create IOProc callback. */
 817     err = AudioDeviceCreateIOProcID(ao->i_selected_dev,
 818                                     (AudioDeviceIOProc)RenderCallbackSPDIF,
 819                                     (void *)ao,
 820                                     &ao->renderCallback);
 821
 822     if (err != noErr || ao->renderCallback == NULL)
 823     {
 824         ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceAddIOProc failed: [%4.4s]\n", (char *)&err);
 825         goto err_out1;
 826     }
 827
 828     reset();
 829
 830     return CONTROL_TRUE;
 831
 832 err_out1:
 833     if (ao->b_revert)
 834         AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
 835 err_out:
 836     if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
 837     {
 838         int b_mix = 1;
 839         err = SetAudioProperty(ao->i_selected_dev,
 840                                kAudioDevicePropertySupportsMixing,
 841                                sizeof(int), &b_mix);
 842         if (err != noErr)
 843             ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n",
 844                    (char *)&err);
 845     }
 846     if (ao->i_hog_pid == getpid())
 847     {
 848         ao->i_hog_pid = -1;
 849         err = SetAudioProperty(ao->i_selected_dev,
 850                                kAudioDevicePropertyHogMode,
 851                                sizeof(ao->i_hog_pid), &ao->i_hog_pid);
 852         if (err != noErr)
 853             ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n",
 854                    (char *)&err);
 855     }
 856     av_fifo_free(ao->buffer);
 857     free(ao);
 858     ao = NULL;
 859     return CONTROL_FALSE;
 860 }
 861
 862 /*****************************************************************************
 863  * AudioDeviceSupportsDigital: Check i_dev_id for digital stream support.
 864  *****************************************************************************/
 865 static int AudioDeviceSupportsDigital( AudioDeviceID i_dev_id )
 866 {
 867     UInt32                      i_param_size = 0;
 868     AudioStreamID               *p_streams = NULL;
 869     int                         i = 0, i_streams = 0;
 870     int                         b_return = CONTROL_FALSE;
 871
 872     /* Retrieve all the output streams. */
 873     i_param_size = GetAudioPropertyArray(i_dev_id,
 874                                          kAudioDevicePropertyStreams,
 875                                          kAudioDevicePropertyScopeOutput,
 876                                          (void **)&p_streams);
 877
 878     if (!i_param_size) {
 879         ao_msg(MSGT_AO, MSGL_WARN, "could not get number of streams.\n");
 880         return CONTROL_FALSE;
 881     }
 882
 883     i_streams = i_param_size / sizeof(AudioStreamID);
 884
 885     for (i = 0; i < i_streams; ++i)
 886     {
 887         if (AudioStreamSupportsDigital(p_streams[i]))
 888             b_return = CONTROL_OK;
 889     }
 890
 891     free(p_streams);
 892     return b_return;
 893 }
 894
 895 /*****************************************************************************
 896  * AudioStreamSupportsDigital: Check i_stream_id for digital stream support.
 897  *****************************************************************************/
 898 static int AudioStreamSupportsDigital( AudioStreamID i_stream_id )
 899 {
 900     UInt32 i_param_size;
 901     AudioStreamBasicDescription *p_format_list = NULL;
 902     int i, i_formats, b_return = CONTROL_FALSE;
 903
 904     /* Retrieve all the stream formats supported by each output stream. */
 905     i_param_size = GetGlobalAudioPropertyArray(i_stream_id,
 906                                                kAudioStreamPropertyPhysicalFormats,
 907                                                (void **)&p_format_list);
 908
 909     if (!i_param_size) {
 910         ao_msg(MSGT_AO, MSGL_WARN, "Could not get number of stream formats.\n");
 911         return CONTROL_FALSE;
 912     }
 913
 914     i_formats = i_param_size / sizeof(AudioStreamBasicDescription);
 915
 916     for (i = 0; i < i_formats; ++i)
 917     {
 918         print_format(MSGL_V, "supported format:", &p_format_list[i]);
 919
 920         if (p_format_list[i].mFormatID == 'IAC3' ||
 921                   p_format_list[i].mFormatID == kAudioFormat60958AC3)
 922             b_return = CONTROL_OK;
 923     }
 924
 925     free(p_format_list);
 926     return b_return;
 927 }
 928
 929 /*****************************************************************************
 930  * AudioStreamChangeFormat: Change i_stream_id to change_format
 931  *****************************************************************************/
 932 static int AudioStreamChangeFormat( AudioStreamID i_stream_id, AudioStreamBasicDescription change_format )
 933 {
 934     OSStatus err = noErr;
 935     int i;
 936     AudioObjectPropertyAddress property_address;
 937
 938     static volatile int stream_format_changed;
 939     stream_format_changed = 0;
 940
 941     print_format(MSGL_V, "setting stream format:", &change_format);
 942
 943     /* Install the callback. */
 944     property_address.mSelector = kAudioStreamPropertyPhysicalFormat;
 945     property_address.mScope    = kAudioObjectPropertyScopeGlobal;
 946     property_address.mElement  = kAudioObjectPropertyElementMaster;
 947
 948     err = AudioObjectAddPropertyListener(i_stream_id,
 949                                          &property_address,
 950                                          StreamListener,
 951                                          (void *)&stream_format_changed);
 952     if (err != noErr)
 953     {
 954         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamAddPropertyListener failed: [%4.4s]\n", (char *)&err);
 955         return CONTROL_FALSE;
 956     }
 957
 958     /* Change the format. */
 959     err = SetAudioProperty(i_stream_id,
 960                            kAudioStreamPropertyPhysicalFormat,
 961                            sizeof(AudioStreamBasicDescription), &change_format);
 962     if (err != noErr)
 963     {
 964         ao_msg(MSGT_AO, MSGL_WARN, "could not set the stream format: [%4.4s]\n", (char *)&err);
 965         return CONTROL_FALSE;
 966     }
 967
 968     /* The AudioStreamSetProperty is not only asynchronious,
 969      * it is also not Atomic, in its behaviour.
 970      * Therefore we check 5 times before we really give up.
 971      * FIXME: failing isn't actually implemented yet. */
 972     for (i = 0; i < 5; ++i)
 973     {
 974         AudioStreamBasicDescription actual_format;
 975         int j;
 976         for (j = 0; !stream_format_changed && j < 50; ++j)
 977             usec_sleep(10000);
 978         if (stream_format_changed)
 979             stream_format_changed = 0;
 980         else
 981             ao_msg(MSGT_AO, MSGL_V, "reached timeout\n" );
 982
 983         err = GetAudioProperty(i_stream_id,
 984                                kAudioStreamPropertyPhysicalFormat,
 985                                sizeof(AudioStreamBasicDescription), &actual_format);
 986
 987         print_format(MSGL_V, "actual format in use:", &actual_format);
 988         if (actual_format.mSampleRate == change_format.mSampleRate &&
 989             actual_format.mFormatID == change_format.mFormatID &&
 990             actual_format.mFramesPerPacket == change_format.mFramesPerPacket)
 991         {
 992             /* The right format is now active. */
 993             break;
 994         }
 995         /* We need to check again. */
 996     }
 997
 998     /* Removing the property listener. */
 999     err = AudioObjectRemovePropertyListener(i_stream_id,
1000                                             &property_address,
1001                                             StreamListener,
1002                                             (void *)&stream_format_changed);
1003     if (err != noErr)
1004     {
1005         ao_msg(MSGT_AO, MSGL_WARN, "AudioStreamRemovePropertyListener failed: [%4.4s]\n", (char *)&err);
1006         return CONTROL_FALSE;
1007     }
1008
1009     return CONTROL_TRUE;
1010 }
1011
1012 /*****************************************************************************
1013  * RenderCallbackSPDIF: callback for SPDIF audio output
1014  *****************************************************************************/
1015 static OSStatus RenderCallbackSPDIF( AudioDeviceID inDevice,
1016                                     const AudioTimeStamp * inNow,
1017                                     const void * inInputData,
1018                                     const AudioTimeStamp * inInputTime,
1019                                     AudioBufferList * outOutputData,
1020                                     const AudioTimeStamp * inOutputTime,
1021                                     void * threadGlobals )
1022 {
1023     int amt = av_fifo_size(ao->buffer);
1024     int req = outOutputData->mBuffers[ao->i_stream_index].mDataByteSize;
1025
1026     if (amt > req)
1027         amt = req;
1028     if (amt)
1029         read_buffer(ao->b_muted ? NULL : (unsigned char *)outOutputData->mBuffers[ao->i_stream_index].mData, amt);
1030
1031     return noErr;
1032 }
1033
1034
1035 static int play(void* output_samples,int num_bytes,int flags)
1036 {
1037     int wrote, b_digital;
1038     SInt32 exit_reason;
1039
1040     // Check whether we need to reset the digital output stream.
1041     if (ao->b_digital && ao->b_stream_format_changed)
1042     {
1043         ao->b_stream_format_changed = 0;
1044         b_digital = AudioStreamSupportsDigital(ao->i_stream_id);
1045         if (b_digital)
1046         {
1047             /* Current stream supports digital format output, let's set it. */
1048             ao_msg(MSGT_AO, MSGL_V,
1049                    "Detected current stream supports digital, try to restore digital output...\n");
1050
1051             if (!AudioStreamChangeFormat(ao->i_stream_id, ao->stream_format))
1052             {
1053                 ao_msg(MSGT_AO, MSGL_WARN, "Restoring digital output failed.\n");
1054             }
1055             else
1056             {
1057                 ao_msg(MSGT_AO, MSGL_WARN, "Restoring digital output succeeded.\n");
1058                 reset();
1059             }
1060         }
1061         else
1062             ao_msg(MSGT_AO, MSGL_V, "Detected current stream does not support digital.\n");
1063     }
1064
1065     wrote=write_buffer(output_samples, num_bytes);
1066     audio_resume();
1067
1068     do {
1069         exit_reason = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 0.01, true);
1070     } while (exit_reason == kCFRunLoopRunHandledSource);
1071
1072     return wrote;
1073 }
1074
1075 /* set variables and buffer to initial state */
1076 static void reset(void)
1077 {
1078   audio_pause();
1079   av_fifo_reset(ao->buffer);
1080 }
1081
1082
1083 /* return available space */
1084 static int get_space(void)
1085 {
1086   return ao->buffer_len - av_fifo_size(ao->buffer);
1087 }
1088
1089
1090 /* return delay until audio is played */
1091 static float get_delay(void)
1092 {
1093   // inaccurate, should also contain the data buffered e.g. by the OS
1094   return (float)av_fifo_size(ao->buffer)/(float)ao_data.bps;
1095 }
1096
1097
1098 /* unload plugin and deregister from coreaudio */
1099 static void uninit(int immed)
1100 {
1101   OSStatus            err = noErr;
1102
1103   if (!immed) {
1104     long long timeleft=(1000000LL*av_fifo_size(ao->buffer))/ao_data.bps;
1105     ao_msg(MSGT_AO,MSGL_DBG2, "%d bytes left @%d bps (%d usec)\n", av_fifo_size(ao->buffer), ao_data.bps, (int)timeleft);
1106     usec_sleep((int)timeleft);
1107   }
1108
1109   if (!ao->b_digital) {
1110       AudioOutputUnitStop(ao->theOutputUnit);
1111       AudioUnitUninitialize(ao->theOutputUnit);
1112       CloseComponent(ao->theOutputUnit);
1113   }
1114   else {
1115       /* Stop device. */
1116       err = AudioDeviceStop(ao->i_selected_dev, ao->renderCallback);
1117       if (err != noErr)
1118           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1119
1120       /* Remove IOProc callback. */
1121       err = AudioDeviceDestroyIOProcID(ao->i_selected_dev, ao->renderCallback);
1122       if (err != noErr)
1123           ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceRemoveIOProc failed: [%4.4s]\n", (char *)&err);
1124
1125       if (ao->b_revert)
1126           AudioStreamChangeFormat(ao->i_stream_id, ao->sfmt_revert);
1127
1128       if (ao->b_changed_mixing && ao->sfmt_revert.mFormatID != kAudioFormat60958AC3)
1129       {
1130           UInt32 b_mix;
1131           Boolean b_writeable;
1132           /* Revert mixable to true if we are allowed to. */
1133           err = IsAudioPropertySettable(ao->i_selected_dev,
1134                                         kAudioDevicePropertySupportsMixing,
1135                                         &b_writeable);
1136           err = GetAudioProperty(ao->i_selected_dev,
1137                                  kAudioDevicePropertySupportsMixing,
1138                                  sizeof(UInt32), &b_mix);
1139           if (err != noErr && b_writeable)
1140           {
1141               b_mix = 1;
1142               err = SetAudioProperty(ao->i_selected_dev,
1143                                      kAudioDevicePropertySupportsMixing,
1144                                      sizeof(UInt32), &b_mix);
1145           }
1146           if (err != noErr)
1147               ao_msg(MSGT_AO, MSGL_WARN, "failed to set mixmode: [%4.4s]\n", (char *)&err);
1148       }
1149       if (ao->i_hog_pid == getpid())
1150       {
1151           ao->i_hog_pid = -1;
1152           err = SetAudioProperty(ao->i_selected_dev,
1153                                  kAudioDevicePropertyHogMode,
1154                                  sizeof(ao->i_hog_pid), &ao->i_hog_pid);
1155           if (err != noErr) ao_msg(MSGT_AO, MSGL_WARN, "Could not release hogmode: [%4.4s]\n", (char *)&err);
1156       }
1157   }
1158
1159   av_fifo_free(ao->buffer);
1160   free(ao);
1161   ao = NULL;
1162 }
1163
1164
1165 /* stop playing, keep buffers (for pause) */
1166 static void audio_pause(void)
1167 {
1168     OSErr err=noErr;
1169
1170     /* Stop callback. */
1171     if (!ao->b_digital)
1172     {
1173         err=AudioOutputUnitStop(ao->theOutputUnit);
1174         if (err != noErr)
1175             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStop returned [%4.4s]\n", (char *)&err);
1176     }
1177     else
1178     {
1179         err = AudioDeviceStop(ao->i_selected_dev, ao->renderCallback);
1180         if (err != noErr)
1181             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStop failed: [%4.4s]\n", (char *)&err);
1182     }
1183     ao->paused = 1;
1184 }
1185
1186
1187 /* resume playing, after audio_pause() */
1188 static void audio_resume(void)
1189 {
1190     OSErr err=noErr;
1191
1192     if (!ao->paused)
1193         return;
1194
1195     /* Start callback. */
1196     if (!ao->b_digital)
1197     {
1198         err = AudioOutputUnitStart(ao->theOutputUnit);
1199         if (err != noErr)
1200             ao_msg(MSGT_AO,MSGL_WARN, "AudioOutputUnitStart returned [%4.4s]\n", (char *)&err);
1201     }
1202     else
1203     {
1204         err = AudioDeviceStart(ao->i_selected_dev, ao->renderCallback);
1205         if (err != noErr)
1206             ao_msg(MSGT_AO, MSGL_WARN, "AudioDeviceStart failed: [%4.4s]\n", (char *)&err);
1207     }
1208     ao->paused = 0;
1209 }
1210
1211 /*****************************************************************************
1212  * StreamListener
1213  *****************************************************************************/
1214 static OSStatus StreamListener( AudioObjectID inObjectID,
1215                                 UInt32 inNumberAddresses,
1216                                 const AudioObjectPropertyAddress inAddresses[],
1217                                 void *inClientData )
1218 {
1219     for (int i=0; i < inNumberAddresses; ++i)
1220     {
1221         if (inAddresses[i].mSelector == kAudioStreamPropertyPhysicalFormat) {
1222             ao_msg(MSGT_AO, MSGL_WARN, "got notify kAudioStreamPropertyPhysicalFormat changed.\n");
1223             if (inClientData)
1224                 *(volatile int *)inClientData = 1;
1225             break;
1226         }
1227     }
1228     return noErr;
1229 }
1230
1231 static OSStatus DeviceListener( AudioObjectID inObjectID,
1232                                 UInt32 inNumberAddresses,
1233                                 const AudioObjectPropertyAddress inAddresses[],
1234                                 void *inClientData )
1235 {
1236     for (int i=0; i < inNumberAddresses; ++i)
1237     {
1238         if (inAddresses[i].mSelector == kAudioDevicePropertyDeviceHasChanged) {
1239             ao_msg(MSGT_AO, MSGL_WARN, "got notify kAudioDevicePropertyDeviceHasChanged.\n");
1240             ao->b_stream_format_changed = 1;
1241             break;
1242         }
1243     }
1244     return noErr;
1245 }