git.sesse.net Git - vlc/blob - modules/audio_output/auhal.c

   1 /*****************************************************************************
   2  * auhal.c: AUHAL output plugin
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Derk-Jan Hartman <hartman at videolan dot org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/aout.h>
  32
  33 #include "aout_internal.h"
  34
  35 #include <CoreAudio/CoreAudio.h>
  36 #include <CoreAudio/CoreAudioTypes.h>
  37 #include <AudioUnit/AudioUnitProperties.h>
  38 #include <AudioUnit/AudioUnitParameters.h>
  39 #include <AudioUnit/AudioOutputUnit.h>
  40 #include <AudioToolbox/AudioFormat.h>
  41
  42 #define STREAM_FORMAT_MSG( pre, sfm ) \
  43     pre "[%ld][%4.4s][%ld][%ld][%ld][%ld][%ld][%ld]", \
  44     (UInt32)sfm.mSampleRate, (char *)&sfm.mFormatID, \
  45     sfm.mFormatFlags, sfm.mBytesPerPacket, \
  46     sfm.mFramesPerPacket, sfm.mBytesPerFrame, \
  47     sfm.mChannelsPerFrame, sfm.mBitsPerChannel
  48
  49 #define STREAM_FORMAT_MSG_FULL( pre, sfm ) \
  50     pre ":\nsamplerate: [%ld]\nFormatID: [%4.4s]\nFormatFlags: [%ld]\nBypesPerPacket: [%ld]\nFramesPerPacket: [%ld]\nBytesPerFrame: [%ld]\nChannelsPerFrame: [%ld]\nBitsPerChannel[%ld]", \
  51     (UInt32)sfm.mSampleRate, (char *)&sfm.mFormatID, \
  52     sfm.mFormatFlags, sfm.mBytesPerPacket, \
  53     sfm.mFramesPerPacket, sfm.mBytesPerFrame, \
  54     sfm.mChannelsPerFrame, sfm.mBitsPerChannel
  55
  56 #define BUFSIZE 0xffffff
  57 #define AOUT_VAR_SPDIF_FLAG 0xf0000000
  58
  59 /*****************************************************************************
  60  * aout_sys_t: private audio output method descriptor
  61  *****************************************************************************
  62  * This structure is part of the audio output thread descriptor.
  63  * It describes the CoreAudio specific properties of an output thread.
  64  *****************************************************************************/
  65 struct aout_sys_t
  66 {
  67     AudioDeviceID               i_default_dev;  /* Keeps DeviceID of defaultOutputDevice */
  68     AudioDeviceID               i_selected_dev; /* Keeps DeviceID of the selected device */
  69     UInt32                      i_devices;      /* Number of CoreAudio Devices */
  70     vlc_bool_t                  b_supports_digital;/* Does the currently selected device support digital mode? */
  71     vlc_bool_t                  b_digital;      /* Are we running in digital mode? */
  72     Component                   au_component;   /* The Audiocomponent we use */
  73     AudioUnit                   au_unit;        /* The AudioUnit we use */
  74     mtime_t                     clock_diff;
  75     uint8_t                     p_remainder_buffer[BUFSIZE];
  76     uint32_t                    i_read_bytes;
  77     uint32_t                    i_total_bytes;
  78 };
  79
  80 /*****************************************************************************
  81  * Local prototypes.
  82  *****************************************************************************/
  83 static int      Open                    ( vlc_object_t * );
  84 int             OpenAnalog              ( aout_instance_t * );
  85 int             OpenSPDIF               ( aout_instance_t * );
  86 static void     Close                   ( vlc_object_t * );
  87
  88 static void     Play                    ( aout_instance_t * );
  89 static void     Probe                   ( aout_instance_t * );
  90
  91 int             AudioDeviceSupportsDigital( aout_instance_t *, AudioDeviceID );
  92 int             AudioDeviceHasOutput    ( AudioDeviceID );
  93
  94 static OSStatus RenderCallbackAnalog    ( vlc_object_t *, AudioUnitRenderActionFlags *, const AudioTimeStamp *,
  95                                           unsigned int, unsigned int, AudioBufferList *);
  96 static OSStatus HardwareListener        ( AudioHardwarePropertyID, void *);
  97
  98 /*****************************************************************************
  99  * Module descriptor
 100  *****************************************************************************/
 101 #define ADEV_TEXT N_("Audio Device")
 102 #define ADEV_LONGTEXT N_("Choose a number corresponding to the number of an " \
 103     "audio device, as listed in your 'Audio Device' menu. This device will " \
 104     "then be used by default for audio playback.")
 105
 106 vlc_module_begin();
 107     set_shortname( "auhal" );
 108     set_description( _("HAL AudioUnit output") );
 109     set_capability( "audio output", 101 );
 110     set_category( CAT_AUDIO );
 111     set_subcategory( SUBCAT_AUDIO_AOUT );
 112     set_callbacks( Open, Close );
 113     //add_integer( "macosx-audio-device", -1, NULL, ADEV_TEXT, ADEV_LONGTEXT, VLC_FALSE );
 114 vlc_module_end();
 115
 116 /*****************************************************************************
 117  * Open: open a HAL AudioUnit
 118  *****************************************************************************/
 119 static int Open( vlc_object_t * p_this )
 120 {
 121     OSStatus                err = noErr;
 122     UInt32                  i_param_size = 0, i_hog = 0;
 123     struct aout_sys_t       *p_sys = NULL;
 124     vlc_bool_t              b_alive = VLC_FALSE;
 125     vlc_value_t             val;
 126     aout_instance_t         *p_aout = (aout_instance_t *)p_this;
 127
 128     /* Allocate structure */
 129     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 130     if( p_aout->output.p_sys == NULL )
 131     {
 132         msg_Err( p_aout, "out of memory" );
 133         return( VLC_ENOMEM );
 134     }
 135
 136     p_sys = p_aout->output.p_sys;
 137     p_sys->i_default_dev = 0;
 138     p_sys->i_selected_dev = 0;
 139     p_sys->i_devices = 0;
 140     p_sys->b_supports_digital = VLC_FALSE;
 141     p_sys->b_digital = VLC_FALSE;
 142     p_sys->au_component = NULL;
 143     p_sys->au_unit = NULL;
 144     p_sys->clock_diff = (mtime_t) 0;
 145     p_sys->i_read_bytes = 0;
 146     p_sys->i_total_bytes = 0;
 147     memset( p_sys->p_remainder_buffer, 0, sizeof(uint8_t) * BUFSIZE );
 148
 149     p_aout->output.pf_play = Play;
 150
 151     aout_FormatPrint( p_aout, "VLC is looking for:\n", (audio_sample_format_t *)&p_aout->output.output );
 152
 153     /* Build a list of devices */
 154     if( var_Type( p_aout, "audio-device" ) == 0 )
 155     {
 156         Probe( p_aout );
 157     }
 158
 159     /* What device do we want? */
 160     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 161     {
 162         msg_Err( p_aout, "audio-device var does not exist. device probe failed." );
 163         free( p_sys );
 164         return( VLC_ENOVAR );
 165     }
 166
 167     p_sys->i_selected_dev = val.i_int & ~AOUT_VAR_SPDIF_FLAG;
 168     p_sys->b_supports_digital = ( val.i_int & AOUT_VAR_SPDIF_FLAG ) ? VLC_TRUE : VLC_FALSE;
 169
 170     /* Check if the desired device is alive and usable */
 171     i_param_size = sizeof( b_alive );
 172     err = AudioDeviceGetProperty( p_sys->i_selected_dev, 0, FALSE,
 173                                   kAudioDevicePropertyDeviceIsAlive,
 174                                   &i_param_size, &b_alive );
 175
 176     if( err != noErr )
 177     {
 178         msg_Err( p_aout, "could not check whether device is alive: %4.4s",
 179                  (char *)&err );
 180         return VLC_EGENERIC;
 181     }
 182
 183     if( b_alive == VLC_FALSE )
 184     {
 185         msg_Err( p_aout, "Selected audio device is not alive" );
 186         var_Destroy( p_aout, "audio-device" );
 187         free( p_sys );
 188         return VLC_EGENERIC;
 189     }
 190
 191     i_param_size = sizeof( i_hog );
 192     err = AudioDeviceGetProperty( p_sys->i_selected_dev, 0, FALSE,
 193                                   kAudioDevicePropertyHogMode,
 194                                   &i_param_size, &i_hog );
 195
 196     if( err != noErr )
 197     {
 198         msg_Err( p_aout, "could not check whether device is hogged: %4.4s",
 199                  (char *)&err );
 200         return VLC_EGENERIC;
 201     }
 202
 203     if( i_hog != -1 )
 204     {
 205         msg_Err( p_aout, "Selected audio device is exclusively in use by another program" );
 206         var_Destroy( p_aout, "audio-device" );
 207         free( p_sys );
 208         return VLC_EGENERIC;
 209     }
 210
 211     /* Check for Digital mode or Analog output mode */
 212     if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) && p_sys->b_supports_digital )
 213     {
 214         if( OpenSPDIF( p_aout ) )
 215             return VLC_SUCCESS;
 216     }
 217     else
 218     {
 219         if( OpenAnalog( p_aout ) )
 220             return VLC_SUCCESS;
 221     }
 222
 223     /* If we reach this, the Open* failed */
 224     var_Destroy( p_aout, "audio-device" );
 225     free( p_sys );
 226     return VLC_EGENERIC;
 227 }
 228
 229 int OpenAnalog( aout_instance_t *p_aout )
 230 {
 231     struct aout_sys_t       *p_sys = p_aout->output.p_sys;
 232     OSStatus                err = noErr;
 233     UInt32                  i_param_size = 0, i = 0;
 234     ComponentDescription    desc;
 235
 236     if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) && !p_sys->b_supports_digital )
 237     {
 238         msg_Dbg( p_aout, "we had requested a digital stream, but it's not possible for this device" );
 239     }
 240
 241     /* If analog only start setting up AUHAL */
 242     /* Lets go find our Component */
 243     desc.componentType = kAudioUnitType_Output;
 244     desc.componentSubType = kAudioUnitSubType_HALOutput;
 245     desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 246     desc.componentFlags = 0;
 247     desc.componentFlagsMask = 0;
 248
 249     p_sys->au_component = FindNextComponent( NULL, &desc );
 250     if( p_sys->au_component == NULL )
 251     {
 252         msg_Err( p_aout, "we cannot find our HAL component" );
 253         return VLC_FALSE;
 254     }
 255
 256     err = OpenAComponent( p_sys->au_component, &p_sys->au_unit );
 257     if( err )
 258     {
 259         msg_Err( p_aout, "we cannot find our HAL component" );
 260         return VLC_FALSE;
 261     }
 262
 263     /* Enable IO for the component */
 264
 265     /* Set the device */
 266     verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
 267                          kAudioOutputUnitProperty_CurrentDevice,
 268                          kAudioUnitScope_Global,
 269                          0,
 270                          &p_sys->i_selected_dev,
 271                          sizeof(p_sys->i_selected_dev)));
 272
 273     /* Get the current format */
 274     AudioStreamBasicDescription DeviceFormat;
 275
 276     i_param_size = sizeof(AudioStreamBasicDescription);
 277
 278     verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
 279                                    kAudioUnitProperty_StreamFormat,
 280                                    kAudioUnitScope_Input,
 281                                    0,
 282                                    &DeviceFormat,
 283                                    &i_param_size ));
 284
 285     msg_Dbg( p_aout, STREAM_FORMAT_MSG( "current format is: " , DeviceFormat ) );
 286
 287     /* Get the channel layout */
 288     AudioChannelLayout *layout;
 289     verify_noerr( AudioUnitGetPropertyInfo( p_sys->au_unit,
 290                                    kAudioDevicePropertyPreferredChannelLayout,
 291                                    kAudioUnitScope_Output,
 292                                    0,
 293                                    &i_param_size,
 294                                    NULL ));
 295
 296     layout = (AudioChannelLayout *)malloc( i_param_size);
 297
 298     verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
 299                                    kAudioDevicePropertyPreferredChannelLayout,
 300                                    kAudioUnitScope_Output,
 301                                    0,
 302                                    layout,
 303                                    &i_param_size ));
 304
 305     /* Lets fill out the ChannelLayout */
 306     if( layout->mChannelLayoutTag == kAudioChannelLayoutTag_UseChannelBitmap)
 307     {
 308         msg_Dbg( p_aout, "bitmap defined channellayout" );
 309         verify_noerr( AudioFormatGetProperty( kAudioFormatProperty_ChannelLayoutForBitmap,
 310                                 sizeof( UInt32), &layout->mChannelBitmap,
 311                                 &i_param_size,
 312                                 layout ));
 313     }
 314     else if( layout->mChannelLayoutTag != kAudioChannelLayoutTag_UseChannelDescriptions )
 315     {
 316         msg_Dbg( p_aout, "layouttags defined channellayout" );
 317         verify_noerr( AudioFormatGetProperty( kAudioFormatProperty_ChannelLayoutForTag,
 318                                 sizeof( AudioChannelLayoutTag ), &layout->mChannelLayoutTag,
 319                                 &i_param_size,
 320                                 layout ));
 321     }
 322
 323     msg_Dbg( p_aout, "Layout of AUHAL has %d channels" , (int)layout->mNumberChannelDescriptions );
 324
 325     p_aout->output.output.i_physical_channels = 0;
 326     for( i = 0; i < layout->mNumberChannelDescriptions; i++ )
 327     {
 328         msg_Dbg( p_aout, "This is channel: %d", (int)layout->mChannelDescriptions[i].mChannelLabel );
 329
 330         switch( layout->mChannelDescriptions[i].mChannelLabel )
 331         {
 332             case kAudioChannelLabel_Left:
 333                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_LEFT;
 334                 continue;
 335             case kAudioChannelLabel_Right:
 336                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_RIGHT;
 337                 continue;
 338             case kAudioChannelLabel_Center:
 339                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_CENTER;
 340                 continue;
 341             case kAudioChannelLabel_LFEScreen:
 342                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_LFE;
 343                 continue;
 344             case kAudioChannelLabel_LeftSurround:
 345                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARLEFT;
 346                 continue;
 347             case kAudioChannelLabel_RightSurround:
 348                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARRIGHT;
 349                 continue;
 350             case kAudioChannelLabel_RearSurroundLeft:
 351                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_MIDDLELEFT;
 352                 continue;
 353             case kAudioChannelLabel_RearSurroundRight:
 354                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_MIDDLERIGHT;
 355                 continue;
 356             case kAudioChannelLabel_CenterSurround:
 357                 p_aout->output.output.i_physical_channels |= AOUT_CHAN_REARCENTER;
 358                 continue;
 359             default:
 360                 msg_Warn( p_aout, "Unrecognized channel form provided by driver: %d", (int)layout->mChannelDescriptions[i].mChannelLabel );
 361                 if( i == 0 )
 362                 {
 363                     msg_Warn( p_aout, "Probably no channellayout is set. force based on channelcount" );
 364                     switch( layout->mNumberChannelDescriptions )
 365                     {
 366                         /* We make assumptions based on number of channels here.
 367                          * Unfortunatly Apple has provided no 100% method to retrieve the speaker configuration */
 368                         case 1:
 369                             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 370                             break;
 371                         case 4:
 372                             p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 373                                                                         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 374                             break;
 375                         case 6:
 376                             p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 377                                                                         AOUT_CHAN_CENTER | AOUT_CHAN_LFE |
 378                                                                         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 379                             break;
 380                         case 7:
 381                             p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 382                                                                         AOUT_CHAN_CENTER | AOUT_CHAN_LFE |
 383                                                                         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_REARCENTER;
 384                             break;
 385                         case 8:
 386                             p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 387                                                                         AOUT_CHAN_CENTER | AOUT_CHAN_LFE |
 388                                                                         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
 389                                                                         AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 390                             break;
 391                         case 2:
 392                         default:
 393                             p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 394                     }
 395                 }
 396                 break;
 397         }
 398     }
 399     free( layout );
 400
 401     msg_Dbg( p_aout, "defined %d physical channels for vlc core", aout_FormatNbChannels( &p_aout->output.output ) );
 402     msg_Dbg( p_aout, "%s", aout_FormatPrintChannels( &p_aout->output.output ));
 403
 404     AudioChannelLayout new_layout;
 405     memset (&new_layout, 0, sizeof(new_layout));
 406     switch( aout_FormatNbChannels( &p_aout->output.output ) )
 407     {
 408         case 1:
 409             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_Mono;
 410             break;
 411         case 2:
 412             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo;
 413             break;
 414         case 3:
 415             if( p_aout->output.output.i_physical_channels & AOUT_CHAN_CENTER )
 416             {
 417                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_7; // L R C
 418             }
 419             else if( p_aout->output.output.i_physical_channels & AOUT_CHAN_LFE )
 420             {
 421                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_4; // L R LFE
 422             }
 423             break;
 424         case 4:
 425             if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER | AOUT_CHAN_LFE ) )
 426             {
 427                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_10; // L R C LFE
 428             }
 429             else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT ) )
 430             {
 431                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_3; // L R Ls Rs
 432             }
 433             else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER | AOUT_CHAN_REARCENTER ) )
 434             {
 435                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_3; // L R C Cs
 436             }
 437             break;
 438         case 5:
 439             if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_CENTER ) )
 440             {
 441                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_19; // L R Ls Rs C
 442             }
 443             else if( p_aout->output.output.i_physical_channels & ( AOUT_CHAN_LFE ) )
 444             {
 445                 new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_18; // L R Ls Rs LFE
 446             }
 447             break;
 448         case 6:
 449             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_DVD_20; // L R Ls Rs C LFE
 450             break;
 451         case 7:
 452             /* FIXME: This is incorrect. VLC uses the internal ordering: L R Lm Rm Lr Rr C LFE but this is wrong */
 453             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_6_1_A; // L R C LFE Ls Rs Cs
 454             break;
 455         case 8:
 456             /* FIXME: This is incorrect. VLC uses the internal ordering: L R Lm Rm Lr Rr C LFE but this is wrong */
 457             new_layout.mChannelLayoutTag = kAudioChannelLayoutTag_MPEG_7_1_A; // L R C LFE Ls Rs Lc Rc
 458             break;
 459     }
 460
 461     /* Set up the format to be used */
 462     DeviceFormat.mSampleRate = p_aout->output.output.i_rate;
 463     DeviceFormat.mFormatID = kAudioFormatLinearPCM;
 464
 465     /* We use float 32. It's the best supported format by both VLC and Coreaudio */
 466     p_aout->output.output.i_format = VLC_FOURCC( 'f','l','3','2');
 467     DeviceFormat.mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
 468     DeviceFormat.mBitsPerChannel = 32;
 469     DeviceFormat.mChannelsPerFrame = aout_FormatNbChannels( &p_aout->output.output );
 470
 471     /* Calculate framesizes and stuff */
 472     aout_FormatPrepare( &p_aout->output.output );
 473     DeviceFormat.mFramesPerPacket = 1;
 474     DeviceFormat.mBytesPerFrame = DeviceFormat.mBitsPerChannel * DeviceFormat.mChannelsPerFrame / 8;
 475     DeviceFormat.mBytesPerPacket = DeviceFormat.mBytesPerFrame * DeviceFormat.mFramesPerPacket;
 476
 477     i_param_size = sizeof(AudioStreamBasicDescription);
 478     /* Set desired format (Use CAStreamBasicDescription )*/
 479     verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
 480                                    kAudioUnitProperty_StreamFormat,
 481                                    kAudioUnitScope_Input,
 482                                    0,
 483                                    &DeviceFormat,
 484                                    i_param_size ));
 485
 486     msg_Dbg( p_aout, STREAM_FORMAT_MSG( "we set the AU format: " , DeviceFormat ) );
 487
 488     /* Retrieve actual format??? */
 489     verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
 490                                    kAudioUnitProperty_StreamFormat,
 491                                    kAudioUnitScope_Input,
 492                                    0,
 493                                    &DeviceFormat,
 494                                    &i_param_size ));
 495
 496     msg_Dbg( p_aout, STREAM_FORMAT_MSG( "the actual set AU format is " , DeviceFormat ) );
 497
 498     p_aout->output.i_nb_samples = 2048;
 499     aout_VolumeSoftInit( p_aout );
 500
 501     /* Let's pray for the following operation to be atomic... */
 502     p_sys->clock_diff = - (mtime_t)
 503         AudioConvertHostTimeToNanos( AudioGetCurrentHostTime() ) / 1000;
 504     p_sys->clock_diff += mdate();
 505
 506     p_sys->i_read_bytes = 0;
 507     p_sys->i_total_bytes = 0;
 508
 509     /* set the IOproc callback */
 510     AURenderCallbackStruct input;
 511     input.inputProc = (AURenderCallback) RenderCallbackAnalog;
 512     input.inputProcRefCon = p_aout;
 513
 514     verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
 515                             kAudioUnitProperty_SetRenderCallback,
 516                             kAudioUnitScope_Input,
 517                             0, &input, sizeof( input ) ) );
 518
 519     input.inputProc = (AURenderCallback) RenderCallbackAnalog;
 520     input.inputProcRefCon = p_aout;
 521
 522     /* Set the new_layout as the layout VLC feeds to the AU unit */
 523     verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
 524                             kAudioUnitProperty_AudioChannelLayout,
 525                             kAudioUnitScope_Input,
 526                             0, &new_layout, sizeof(new_layout) ) );
 527
 528     /* AU initiliaze */
 529     verify_noerr( AudioUnitInitialize(p_sys->au_unit) );
 530
 531     verify_noerr( AudioOutputUnitStart(p_sys->au_unit) );
 532
 533     return VLC_TRUE;
 534 }
 535
 536 /*****************************************************************************
 537  * Setup a encoded digital stream (SPDIF)
 538  *****************************************************************************/
 539 int OpenSPDIF( aout_instance_t * p_aout )
 540 {
 541     OSStatus            err = noErr;
 542     UInt32              i, i_param_size;
 543     AudioDeviceID       devid_def;
 544     AudioDeviceID       *p_devices = NULL;
 545     vlc_value_t         val, text;
 546
 547     struct aout_sys_t   *p_sys = p_aout->output.p_sys;
 548
 549     /* Start doing the SPDIF setup proces */
 550     p_sys->b_digital = VLC_TRUE;
 551     p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 552     msg_Dbg( p_aout, "we found a digital stream, and we WANT a digital stream" );
 553
 554     return VLC_FALSE;
 555
 556 error:
 557     return VLC_FALSE;
 558 }
 559
 560
 561 /*****************************************************************************
 562  * Close: Close HAL AudioUnit
 563  *****************************************************************************/
 564 static void Close( vlc_object_t * p_this )
 565 {
 566     aout_instance_t     *p_aout = (aout_instance_t *)p_this;
 567     struct aout_sys_t   *p_sys = p_aout->output.p_sys;
 568
 569     if( p_sys->au_unit )
 570     {
 571         verify_noerr( AudioOutputUnitStop( p_sys->au_unit ) );
 572         verify_noerr( AudioUnitUninitialize( p_sys->au_unit ) );
 573         verify_noerr( CloseComponent( p_sys->au_unit ) );
 574     }
 575     free( p_sys );
 576 }
 577
 578 /*****************************************************************************
 579  * Play: nothing to do
 580  *****************************************************************************/
 581 static void Play( aout_instance_t * p_aout )
 582 {
 583 }
 584
 585
 586 /*****************************************************************************
 587  * Probe
 588  *****************************************************************************/
 589 static void Probe( aout_instance_t * p_aout )
 590 {
 591     OSStatus            err = noErr;
 592     UInt32              i = 0, i_param_size = 0;
 593     AudioDeviceID       devid_def = 0;
 594     AudioDeviceID       *p_devices = NULL;
 595     vlc_value_t         val, text;
 596
 597     struct aout_sys_t   *p_sys = p_aout->output.p_sys;
 598
 599     /* Get number of devices */
 600     err = AudioHardwareGetPropertyInfo( kAudioHardwarePropertyDevices,
 601                                         &i_param_size, NULL );
 602     if( err != noErr )
 603     {
 604         msg_Err( p_aout, "could not get number of devices: [%4.4s]", (char *)&err );
 605         goto error;
 606     }
 607
 608     p_sys->i_devices = i_param_size / sizeof( AudioDeviceID );
 609
 610     if( p_sys->i_devices < 1 )
 611     {
 612         msg_Err( p_aout, "no devices found" );
 613         goto error;
 614     }
 615
 616     msg_Dbg( p_aout, "system has [%ld] device(s)", p_sys->i_devices );
 617
 618     /* Allocate DeviceID array */
 619     p_devices = (AudioDeviceID*)malloc( sizeof(AudioDeviceID) * p_sys->i_devices );
 620     if( p_devices == NULL )
 621     {
 622         msg_Err( p_aout, "out of memory" );
 623         goto error;
 624     }
 625
 626     /* Populate DeviceID array */
 627     err = AudioHardwareGetProperty( kAudioHardwarePropertyDevices,
 628                                     &i_param_size, p_devices );
 629     if( err != noErr )
 630     {
 631         msg_Err( p_aout, "could not get the device ID's: [%4.4s]", (char *)&err );
 632         goto error;
 633     }
 634
 635     /* Find the ID of the default Device */
 636     i_param_size = sizeof( AudioDeviceID );
 637     err = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultOutputDevice,
 638                                     &i_param_size, &devid_def );
 639     if( err != noErr )
 640     {
 641         msg_Err( p_aout, "could not get default audio device: [%4.4s]", (char *)&err );
 642         goto error;
 643     }
 644     p_sys->i_default_dev = devid_def;
 645
 646     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER|VLC_VAR_HASCHOICE );
 647     text.psz_string = _("Audio Device");
 648     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 649
 650     for( i = 0; i < p_sys->i_devices; i++ )
 651     {
 652         char *psz_name;
 653         i_param_size = 0;
 654
 655         /* Retrieve the length of the device name */
 656         err = AudioDeviceGetPropertyInfo(
 657                     p_devices[i], 0, VLC_FALSE,
 658                     kAudioDevicePropertyDeviceName,
 659                     &i_param_size, NULL);
 660         if( err ) goto error;
 661
 662         /* Retrieve the name of the device */
 663         psz_name = (char *)malloc( i_param_size );
 664         err = AudioDeviceGetProperty(
 665                     p_devices[i], 0, VLC_FALSE,
 666                     kAudioDevicePropertyDeviceName,
 667                     &i_param_size, psz_name);
 668         if( err ) goto error;
 669
 670         msg_Dbg( p_aout, "DevID: %lu  DevName: %s", p_devices[i], psz_name );
 671
 672         if( !AudioDeviceHasOutput( p_devices[i]) )
 673         {
 674             msg_Dbg( p_aout, "this device is INPUT only. skipping..." );
 675             continue;
 676         }
 677
 678         val.i_int = (int)p_devices[i];
 679         text.psz_string = strdup( psz_name );
 680         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 681         if( p_sys->i_default_dev == p_devices[i] )
 682         {
 683             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 684             var_Set( p_aout, "audio-device", val );
 685         }
 686
 687         if( AudioDeviceSupportsDigital( p_aout, p_devices[i]) )
 688         {
 689             val.i_int = (int)p_devices[i] | AOUT_VAR_SPDIF_FLAG;
 690             asprintf( &text.psz_string, "%s (Encoded Output)", psz_name );
 691             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 692             if( p_sys->i_default_dev == p_devices[i] && config_GetInt( p_aout, "spdif" ) )
 693             {
 694                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 695                 var_Set( p_aout, "audio-device", val );
 696             }
 697         }
 698
 699         free( psz_name);
 700     }
 701     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 702
 703     /* attach a Listener so that we are notified of a change in the Device setup */
 704     err = AudioHardwareAddPropertyListener( kAudioHardwarePropertyDevices,
 705                                             HardwareListener,
 706                                             (void *)p_aout );
 707     if( err )
 708         goto error;
 709
 710     msg_Dbg( p_aout, "succesful finish of deviceslist" );
 711     if( p_devices ) free( p_devices );
 712     return;
 713
 714 error:
 715     var_Destroy( p_aout, "audio-device" );
 716     if( p_devices ) free( p_devices );
 717     return;
 718 }
 719
 720 /*****************************************************************************
 721  * AudioDeviceSupportsDigital: Check i_dev_id for digital stream support.
 722  *****************************************************************************/
 723 int AudioDeviceSupportsDigital( aout_instance_t *p_aout, AudioDeviceID i_dev_id )
 724 {
 725     OSStatus                    err = noErr;
 726     UInt32                      i_param_size = 0;
 727     AudioStreamBasicDescription *p_format_list = NULL;
 728     AudioStreamID               *p_streams = NULL;
 729     int                         i = 0, j = 0;
 730     int                         i_formats = 0, i_streams = 0;
 731     vlc_bool_t                  b_return = VLC_FALSE;
 732
 733     /* Retrieve all the output streams */
 734     err = AudioDeviceGetPropertyInfo( i_dev_id, 0, FALSE,
 735                                       kAudioDevicePropertyStreams,
 736                                       &i_param_size, NULL );
 737     if( err != noErr )
 738     {
 739         msg_Err( p_aout, "could not get number of streams: [%4.4s]", (char *)&err );
 740         return VLC_FALSE;
 741     }
 742
 743     i_streams = i_param_size / sizeof( AudioStreamID );
 744     p_streams = (AudioStreamID *)malloc( i_param_size );
 745     if( p_streams == NULL )
 746     {
 747         msg_Err( p_aout, "Out of memory" );
 748         return VLC_ENOMEM;
 749     }
 750
 751     err = AudioDeviceGetProperty( i_dev_id, 0, FALSE,
 752                                     kAudioDevicePropertyStreams,
 753                                     &i_param_size, p_streams );
 754
 755     if( err != noErr )
 756     {
 757         msg_Err( p_aout, "could not get number of streams: [%4.4s]", (char *)&err );
 758         return VLC_FALSE;
 759     }
 760
 761     for( i = 0; i < i_streams; i++ )
 762     {
 763         p_format_list = NULL;
 764         i_formats = 0;
 765         msg_Dbg( p_aout, "retrieving formats for stream: %#lx", p_streams[i] );
 766
 767         /* Retrieve all the stream formats supported by each output stream */
 768         err = AudioStreamGetPropertyInfo( p_streams[i], 0,
 769                                           kAudioDevicePropertyStreamFormats,
 770                                           &i_param_size, NULL );
 771         if( err != noErr )
 772         {
 773             msg_Err( p_aout, "could not get number of streamformats: [%4.4s]", (char *)&err );
 774             break;
 775         }
 776
 777         i_formats = i_param_size / sizeof( AudioStreamBasicDescription );
 778         p_format_list = (AudioStreamBasicDescription *)malloc( i_param_size );
 779         if( p_format_list == NULL )
 780         {
 781             break;
 782         }
 783
 784         err = AudioStreamGetProperty( p_streams[i], 0,
 785                                           kAudioDevicePropertyStreamFormats,
 786                                           &i_param_size, p_format_list );
 787         if( err != noErr )
 788         {
 789             msg_Err( p_aout, "could not get the list of streamformats: [%4.4s]", (char *)&err );
 790             free( p_format_list);
 791             break;
 792         }
 793
 794         for( j = 0; j < i_formats; j++ )
 795         {
 796             msg_Dbg( p_aout, STREAM_FORMAT_MSG( "supported format", p_format_list[j] ) );
 797
 798             if( p_format_list[j].mFormatID == 'IAC3' ||
 799                       p_format_list[j].mFormatID == kAudioFormat60958AC3 )
 800             {
 801                 b_return = VLC_TRUE;
 802                 msg_Dbg( p_aout, "this device supports a digital stream" );
 803                 break;
 804             }
 805         }
 806
 807         if( p_format_list ) free( p_format_list );
 808     }
 809
 810     if( p_streams ) free( p_streams );
 811     return b_return;
 812 }
 813
 814 /*****************************************************************************
 815  * RenderCallbackAnalog: This function is called everytime the AudioUnit wants
 816  * us to provide some more audio data.
 817  * Don't print anything during normal playback, calling blocking function from
 818  * this callback is not allowed.
 819  *****************************************************************************/
 820 static OSStatus RenderCallbackAnalog( vlc_object_t *_p_aout,
 821                                       AudioUnitRenderActionFlags *ioActionFlags,
 822                                       const AudioTimeStamp *inTimeStamp,
 823                                       unsigned int inBusNummer,
 824                                       unsigned int inNumberFrames,
 825                                       AudioBufferList *ioData )
 826 {
 827     AudioTimeStamp  host_time;
 828     mtime_t         current_date = 0;
 829     uint32_t        i_mData_bytes = 0;
 830
 831     aout_instance_t * p_aout = (aout_instance_t *)_p_aout;
 832     struct aout_sys_t * p_sys = p_aout->output.p_sys;
 833
 834     host_time.mFlags = kAudioTimeStampHostTimeValid;
 835     AudioDeviceTranslateTime( p_sys->i_selected_dev, inTimeStamp, &host_time );
 836
 837     p_sys->clock_diff = - (mtime_t)
 838         AudioConvertHostTimeToNanos( AudioGetCurrentHostTime() ) / 1000;
 839     p_sys->clock_diff += mdate();
 840
 841     current_date = p_sys->clock_diff +
 842                    AudioConvertHostTimeToNanos( host_time.mHostTime ) / 1000;
 843                    //- ((mtime_t) 1000000 / p_aout->output.output.i_rate * 31 ); // 31 = Latency in Frames. retrieve somewhere
 844
 845     if( ioData == NULL && ioData->mNumberBuffers < 1 )
 846     {
 847         msg_Err( p_aout, "no iodata or buffers");
 848         return 0;
 849     }
 850     if( ioData->mNumberBuffers > 1 )
 851         msg_Err( p_aout, "well this is weird. seems like there is more than one buffer..." );
 852
 853
 854     if( p_sys->i_total_bytes > 0 )
 855     {
 856         i_mData_bytes = __MIN( p_sys->i_total_bytes - p_sys->i_read_bytes, ioData->mBuffers[0].mDataByteSize );
 857         p_aout->p_vlc->pf_memcpy( ioData->mBuffers[0].mData, &p_sys->p_remainder_buffer[p_sys->i_read_bytes], i_mData_bytes );
 858         p_sys->i_read_bytes += i_mData_bytes;
 859         current_date += (mtime_t) ( (mtime_t) 1000000 / p_aout->output.output.i_rate ) *
 860                         ( i_mData_bytes / 4 / aout_FormatNbChannels( &p_aout->output.output )  ); // 4 is fl32 specific
 861
 862         if( p_sys->i_read_bytes >= p_sys->i_total_bytes )
 863             p_sys->i_read_bytes = p_sys->i_total_bytes = 0;
 864     }
 865
 866     while( i_mData_bytes < ioData->mBuffers[0].mDataByteSize )
 867     {
 868         /* We don't have enough data yet */
 869         aout_buffer_t * p_buffer;
 870         p_buffer = aout_OutputNextBuffer( p_aout, current_date , VLC_FALSE );
 871
 872         if( p_buffer != NULL )
 873         {
 874             uint32_t i_second_mData_bytes = __MIN( p_buffer->i_nb_bytes, ioData->mBuffers[0].mDataByteSize - i_mData_bytes );
 875
 876             p_aout->p_vlc->pf_memcpy( (uint8_t *)ioData->mBuffers[0].mData + i_mData_bytes, p_buffer->p_buffer, i_second_mData_bytes );
 877             i_mData_bytes += i_second_mData_bytes;
 878
 879             if( i_mData_bytes >= ioData->mBuffers[0].mDataByteSize )
 880             {
 881                 p_sys->i_total_bytes = p_buffer->i_nb_bytes - i_second_mData_bytes;
 882                 p_aout->p_vlc->pf_memcpy( p_sys->p_remainder_buffer, &p_buffer->p_buffer[i_second_mData_bytes], p_sys->i_total_bytes );
 883             }
 884             else
 885             {
 886                 // update current_date
 887                 current_date += (mtime_t) ( (mtime_t) 1000000 / p_aout->output.output.i_rate ) *
 888                                 ( i_second_mData_bytes / 4 / aout_FormatNbChannels( &p_aout->output.output )  ); // 4 is fl32 specific
 889             }
 890             aout_BufferFree( p_buffer );
 891         }
 892         else
 893         {
 894              p_aout->p_vlc->pf_memset( (uint8_t *)ioData->mBuffers[0].mData +i_mData_bytes, 0, ioData->mBuffers[0].mDataByteSize - i_mData_bytes );
 895              i_mData_bytes += ioData->mBuffers[0].mDataByteSize - i_mData_bytes;
 896         }
 897     }
 898     return( noErr );
 899 }
 900
 901 int AudioDeviceHasOutput( AudioDeviceID i_dev_id )
 902 {
 903     UInt32                      dataSize;
 904     Boolean                     isWritable;
 905
 906     verify_noerr( AudioDeviceGetPropertyInfo( i_dev_id, 0, FALSE, kAudioDevicePropertyStreams, &dataSize, &isWritable) );
 907     if (dataSize == 0) return FALSE;
 908
 909     return TRUE;
 910 }
 911
 912 /*****************************************************************************
 913  * HardwareListener: Warns us of changes in the list of registered devices
 914  *****************************************************************************/
 915 static OSStatus HardwareListener( AudioHardwarePropertyID inPropertyID,
 916                                   void * inClientData )
 917 {
 918     OSStatus err = noErr;
 919     aout_instance_t     *p_aout = (aout_instance_t *)inClientData;
 920
 921     switch( inPropertyID )
 922     {
 923         case kAudioHardwarePropertyDevices:
 924         {
 925             /* something changed in the list of devices */
 926             /* We trigger the audio-device's aout_ChannelsRestart callback */
 927             var_Change( p_aout, "audio-device", VLC_VAR_TRIGGER_CALLBACKS, NULL, NULL );
 928         }
 929         break;
 930     }
 931
 932     return( err );
 933 }