macosx/HBAudio.m

   1 //
   2 //  HBAudio.m
   3 //  HandBrake
   4 //
   5 //  Created on 2010-08-30.
   6 //
   7
   8 #import "HBAudio.h"
   9 #import "HBAudioController.h"
  10 #import "hb.h"
  11
  12 NSString *keyAudioCodecName = @"keyAudioCodecName";
  13 NSString *keyAudioMP4 = @"keyAudioMP4";
  14 NSString *keyAudioMKV = @"keyAudioMKV";
  15 NSString *keyAudioSampleRateName = @"keyAudioSampleRateName";
  16 NSString *keyAudioBitrateName = @"keyAudioBitrateName";
  17 NSString *keyAudioMustMatchTrack = @"keyAudioMustMatchTrack";
  18 NSString *keyAudioMixdownName = @"keyAudioMixdownName";
  19
  20 NSString *keyAudioCodec = @"codec";
  21 NSString *keyAudioMixdown = @"mixdown";
  22 NSString *keyAudioSamplerate = @"samplerate";
  23 NSString *keyAudioBitrate = @"bitrate";
  24
  25 static NSMutableArray *masterCodecArray = nil;
  26 static NSMutableArray *masterMixdownArray = nil;
  27 static NSMutableArray *masterSampleRateArray = nil;
  28 static NSMutableArray *masterBitRateArray = nil;
  29
  30 @interface NSArray (HBAudioSupport)
  31 - (NSDictionary *) dictionaryWithObject: (id) anObject matchingKey: (NSString *) aKey;
  32 - (NSDictionary *) lastDictionaryWithObject: (id) anObject matchingKey: (NSString *) aKey;
  33 @end
  34 @implementation NSArray (HBAudioSupport)
  35 - (NSDictionary *) dictionaryWithObject: (id) anObject matchingKey: (NSString *) aKey reverse: (BOOL) reverse
  36
  37 {
  38         NSDictionary *retval = nil;
  39         NSEnumerator *enumerator = reverse ? [self reverseObjectEnumerator] : [self objectEnumerator];
  40         NSDictionary *dict;
  41         id aValue;
  42
  43         while (nil != (dict = [enumerator nextObject]) && nil == retval) {
  44                 if (nil != (aValue = [dict objectForKey: aKey]) && YES == [aValue isEqual: anObject]) {
  45                         retval = dict;
  46                 }
  47         }
  48         return retval;
  49 }
  50 - (NSDictionary *) dictionaryWithObject: (id) anObject matchingKey: (NSString *) aKey
  51 {       return [self dictionaryWithObject: anObject matchingKey: aKey reverse: NO];     }
  52 - (NSDictionary *) lastDictionaryWithObject: (id) anObject matchingKey: (NSString *) aKey
  53 {       return [self dictionaryWithObject: anObject matchingKey: aKey reverse: YES];    }
  54
  55 @end
  56
  57 @implementation HBAudio
  58
  59 #pragma mark -
  60 #pragma mark Object Setup
  61
  62 + (void) load
  63
  64 {
  65         if ([HBAudio class] == self) {
  66                 int i;
  67                 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  68                 NSDictionary *dict;
  69
  70                 masterCodecArray = [[NSMutableArray alloc] init];       //      knowingly leaked
  71                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
  72                                                                           NSLocalizedString(@"AAC (CoreAudio)", @"AAC (CoreAudio)"), keyAudioCodecName,
  73                                                                           [NSNumber numberWithInt: HB_ACODEC_CA_AAC], keyAudioCodec,
  74                                                                           [NSNumber numberWithBool: YES], keyAudioMP4,
  75                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
  76                                                                           [NSNumber numberWithBool: NO], keyAudioMustMatchTrack,
  77                                                                           nil]];
  78                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
  79                                                                           NSLocalizedString(@"AAC (faac)", @"AAC (faac)"), keyAudioCodecName,
  80                                                                           [NSNumber numberWithInt: HB_ACODEC_FAAC], keyAudioCodec,
  81                                                                           [NSNumber numberWithBool: YES], keyAudioMP4,
  82                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
  83                                                                           [NSNumber numberWithBool: NO], keyAudioMustMatchTrack,
  84                                                                           nil]];
  85                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
  86                                                                           NSLocalizedString(@"MP3 (lame)", @"MP3 (lame)"), keyAudioCodecName,
  87                                                                           [NSNumber numberWithInt: HB_ACODEC_LAME], keyAudioCodec,
  88                                                                           [NSNumber numberWithBool: YES], keyAudioMP4,
  89                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
  90                                                                           [NSNumber numberWithBool: NO], keyAudioMustMatchTrack,
  91                                                                           nil]];
  92                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
  93                                                                           NSLocalizedString(@"AC3 Passthru", @"AC3 Passthru"), keyAudioCodecName,
  94                                                                           [NSNumber numberWithInt: HB_ACODEC_AC3_PASS], keyAudioCodec,
  95                                                                           [NSNumber numberWithBool: YES], keyAudioMP4,
  96                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
  97                                                                           [NSNumber numberWithInt: HB_ACODEC_AC3], keyAudioMustMatchTrack,
  98                                                                           nil]];
  99                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 100                                                                           NSLocalizedString(@"AC3", @"AC3"), keyAudioCodecName,
 101                                                                           [NSNumber numberWithInt: HB_ACODEC_AC3], keyAudioCodec,
 102                                                                           [NSNumber numberWithBool: YES], keyAudioMP4,
 103                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
 104                                                                           [NSNumber numberWithBool: NO], keyAudioMustMatchTrack,
 105                                                                           nil]];
 106                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 107                                                                           NSLocalizedString(@"DTS Passthru", @"DTS Passthru"), keyAudioCodecName,
 108                                                                           [NSNumber numberWithInt: HB_ACODEC_DCA_PASS], keyAudioCodec,
 109                                                                           [NSNumber numberWithBool: NO], keyAudioMP4,
 110                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
 111                                                                           [NSNumber numberWithInt: HB_ACODEC_DCA], keyAudioMustMatchTrack,
 112                                                                           nil]];
 113                 [masterCodecArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 114                                                                           NSLocalizedString(@"Vorbis (vorbis)", @"Vorbis (vorbis)"), keyAudioCodecName,
 115                                                                           [NSNumber numberWithInt: HB_ACODEC_VORBIS], keyAudioCodec,
 116                                                                           [NSNumber numberWithBool: NO], keyAudioMP4,
 117                                                                           [NSNumber numberWithBool: YES], keyAudioMKV,
 118                                                                           [NSNumber numberWithBool: NO], keyAudioMustMatchTrack,
 119                                                                           nil]];
 120
 121                 masterMixdownArray = [[NSMutableArray alloc] init];     //      knowingly leaked
 122                 [masterMixdownArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 123                                                                                 NSLocalizedString(@"AC3 Passthru", @"AC3 Passthru"), keyAudioMixdownName,
 124                                                                                 [NSNumber numberWithInt: HB_ACODEC_AC3_PASS], keyAudioMixdown,
 125                                                                                 nil]];
 126                 [masterMixdownArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 127                                                                                 NSLocalizedString(@"DTS Passthru", @"DTS Passthru"), keyAudioMixdownName,
 128                                                                                 [NSNumber numberWithInt: HB_ACODEC_DCA_PASS], keyAudioMixdown,
 129                                                                                 nil]];
 130                 for (i = 0; i < hb_audio_mixdowns_count; i++) {
 131                         [masterMixdownArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 132                                                                                         [NSString stringWithUTF8String: hb_audio_mixdowns[i].human_readable_name], keyAudioMixdownName,
 133                                                                                         [NSNumber numberWithInt: hb_audio_mixdowns[i].amixdown], keyAudioMixdown,
 134                                                                                         nil]];
 135                 }
 136
 137                 //      Note that for the Auto value we use 0 for the sample rate because our controller will give back the track's
 138                 //      input sample rate when it finds this 0 value as the selected sample rate.  We do this because the input
 139                 //      sample rate depends on the track, which means it depends on the title, so cannot be nicely set up here.
 140                 masterSampleRateArray = [[NSMutableArray alloc] init];  //      knowingly leaked
 141                 [masterSampleRateArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 142                                                                                    NSLocalizedString(@"Auto", @"Auto"), keyAudioSampleRateName,
 143                                                                                    [NSNumber numberWithInt: 0], keyAudioSamplerate,
 144                                                                                    nil]];
 145                 for (i = 0; i < hb_audio_rates_count; i++) {
 146                         [masterSampleRateArray addObject: [NSDictionary dictionaryWithObjectsAndKeys:
 147                                                                                            [NSString stringWithUTF8String: hb_audio_rates[i].string], keyAudioSampleRateName,
 148                                                                                            [NSNumber numberWithInt: hb_audio_rates[i].rate], keyAudioSamplerate,
 149                                                                                            nil]];
 150                 }
 151
 152                 masterBitRateArray = [[NSMutableArray alloc] init];     // knowingly leaked
 153                 for (i = 0; i < hb_audio_bitrates_count; i++) {
 154                         dict = [NSDictionary dictionaryWithObjectsAndKeys:
 155                                         [NSString stringWithUTF8String: hb_audio_bitrates[i].string], keyAudioBitrateName,
 156                                         [NSNumber numberWithInt: hb_audio_bitrates[i].rate], keyAudioBitrate,
 157                                         nil];
 158                         [masterBitRateArray addObject: dict];
 159                 }
 160
 161                 [pool release];
 162         }
 163         return;
 164 }
 165
 166 //      Ensure the list of codecs is accurate
 167 //      Update the current value of codec based on the revised list
 168 - (void) updateCodecs
 169
 170 {
 171         NSMutableArray *permittedCodecs = [NSMutableArray array];
 172         unsigned int count = [masterCodecArray count];
 173         NSDictionary *dict;
 174         NSString *keyThatAllows = nil;
 175
 176         //      Determine which key we use to see which codecs are permitted
 177         switch ([videoContainerTag intValue]) {
 178                 case HB_MUX_MP4:
 179                         keyThatAllows = keyAudioMP4;
 180                         break;
 181                 case HB_MUX_MKV:
 182                         keyThatAllows = keyAudioMKV;
 183                         break;
 184                 default:
 185                         keyThatAllows = @"error condition";
 186                         break;
 187         }
 188
 189         //      First get a list of the permitted codecs based on the internal rules
 190         if (nil != track && YES == [self enabled]) {
 191                 BOOL goodToAdd;
 192
 193                 for (unsigned int i = 0; i < count; i++) {
 194                         dict = [masterCodecArray objectAtIndex: i];
 195
 196                         //      First make sure only codecs permitted by the container are here
 197                         goodToAdd = [[dict objectForKey: keyThatAllows] boolValue];
 198
 199                         //      Now we make sure if DTS or AC3 is not available in the track it is not put in the codec list, but in a general way
 200                         if (YES == [[dict objectForKey: keyAudioMustMatchTrack] boolValue]) {
 201                                 if ([[dict objectForKey: keyAudioMustMatchTrack] intValue] != [[[self track] objectForKey: keyAudioInputCodec] intValue]) {
 202                                         goodToAdd = NO;
 203                                 }
 204                         }
 205
 206                         if (YES == goodToAdd) {
 207                                 [permittedCodecs addObject: dict];
 208                         }
 209                 }
 210         }
 211
 212         //      Now make sure the permitted list and the actual ones matches
 213         [self setCodecs: permittedCodecs];
 214
 215         //      Ensure our codec is on the list of permitted codecs
 216         if (nil == [self codec] || NO == [permittedCodecs containsObject: [self codec]]) {
 217                 if (0 < [permittedCodecs count]) {
 218                         [self setCodec: [permittedCodecs objectAtIndex: 0]];    //      This should be defaulting to Core Audio
 219                 }
 220                 else {
 221                         [self setCodec: nil];
 222                 }
 223         }
 224
 225         return;
 226 }
 227
 228 - (void) updateMixdowns: (BOOL) shouldSetDefault
 229
 230 {
 231         NSMutableArray *permittedMixdowns = [NSMutableArray array];
 232         NSDictionary *dict;
 233         BOOL shouldAdd;
 234         int currentMixdown;
 235
 236         unsigned int count = [masterMixdownArray count];
 237         int codecCodec = [[codec objectForKey: keyAudioCodec] intValue];
 238         int channelLayout = [[track objectForKey: keyAudioInputChannelLayout] intValue];
 239         int theDefaultMixdown = hb_get_default_mixdown(codecCodec, channelLayout);
 240         int theBestMixdown = hb_get_best_mixdown(codecCodec, channelLayout, 0);
 241
 242         for (unsigned int i = 0; i < count; i++) {
 243                 dict = [masterMixdownArray objectAtIndex: i];
 244                 currentMixdown = [[dict objectForKey: keyAudioMixdown] intValue];
 245
 246                 //      Basically with the way the mixdowns are stored, the assumption from the libhb point of view
 247                 //      currently is that all mixdowns from the best down to mono are supported.
 248                 if (currentMixdown <= theBestMixdown) {
 249                         shouldAdd = YES;
 250                 } else if (0 == theBestMixdown && codecCodec == currentMixdown) {
 251                         // 0 means passthrough, add the current mixdown if it matches the passthrough codec
 252                         shouldAdd = YES;
 253                 } else {
 254                         shouldAdd = NO;
 255                 }
 256
 257                 if (YES == shouldAdd) {
 258                         [permittedMixdowns addObject: dict];
 259                 }
 260         }
 261
 262         if (0 == theDefaultMixdown) {
 263                 // a mixdown of 0 means passthrough
 264                 theDefaultMixdown = codecCodec;
 265         }
 266
 267         if (NO == [self enabled]) {
 268                 permittedMixdowns = nil;
 269         }
 270
 271         //      Now make sure the permitted list and the actual ones matches
 272         [self setMixdowns: permittedMixdowns];
 273
 274         //      Select the proper one
 275         if (YES == shouldSetDefault) {
 276                 [self setMixdown: [permittedMixdowns dictionaryWithObject: [NSNumber numberWithInt: theDefaultMixdown] matchingKey: keyAudioMixdown]];
 277         }
 278
 279         if (nil == [self mixdown] || NO == [permittedMixdowns containsObject: [self mixdown]]) {
 280                 [self setMixdown: [permittedMixdowns lastObject]];
 281         }
 282
 283         return;
 284 }
 285
 286 - (void) updateBitRates: (BOOL) shouldSetDefault
 287
 288 {
 289         NSMutableArray *permittedBitRates = [NSMutableArray array];
 290         NSDictionary *dict;
 291         int minBitRate;
 292         int maxBitRate;
 293         int currentBitRate;
 294         BOOL shouldAdd;
 295
 296         unsigned int count = [masterBitRateArray count];
 297         int trackInputBitRate = [[[self track] objectForKey: keyAudioInputBitrate] intValue];
 298         BOOL limitsToTrackInputBitRate = ([[codec objectForKey: keyAudioCodec] intValue] & HB_ACODEC_PASS_FLAG) ? YES : NO;
 299         int theSampleRate = [[[self sampleRate] objectForKey: keyAudioSamplerate] intValue];
 300
 301         if (0 == theSampleRate) {       //      this means Auto
 302                 theSampleRate = [[[self track] objectForKey: keyAudioInputSampleRate] intValue];
 303                 }
 304
 305         int ourCodec = [[codec objectForKey: keyAudioCodec] intValue];
 306         int ourMixdown = [[[self mixdown] objectForKey: keyAudioMixdown] intValue];
 307         hb_get_audio_bitrate_limits(ourCodec, theSampleRate, ourMixdown, &minBitRate, &maxBitRate);
 308         int theDefaultBitRate = hb_get_default_audio_bitrate(ourCodec, theSampleRate, ourMixdown);
 309
 310         for (unsigned int i = 0; i < count; i++) {
 311                 dict = [masterBitRateArray objectAtIndex: i];
 312                 currentBitRate = [[dict objectForKey: keyAudioBitrate] intValue];
 313
 314                 //      First ensure the bitrate falls within range of the codec
 315                 shouldAdd = (currentBitRate >= minBitRate && currentBitRate <= maxBitRate);
 316
 317                 //      Now make sure the mixdown is not limiting us to the track input bitrate
 318                 if (YES == shouldAdd && YES == limitsToTrackInputBitRate) {
 319                         if (currentBitRate != trackInputBitRate) {
 320                                 shouldAdd = NO;
 321                         }
 322                 }
 323
 324                 if (YES == shouldAdd) {
 325                         [permittedBitRates addObject: dict];
 326                 }
 327         }
 328
 329         //      There is a situation where we have a mixdown requirement to match the track input bit rate,
 330         //      but it does not fall into the range the codec supports.  Therefore, we force it here.
 331         if (YES == limitsToTrackInputBitRate && 0 == [permittedBitRates count]) {
 332                 NSDictionary *missingBitRate = [masterBitRateArray dictionaryWithObject: [NSNumber numberWithInt: trackInputBitRate] matchingKey: keyAudioBitrate];
 333                 if (nil == missingBitRate) {
 334                         //      We are in an even worse situation where the requested bit rate does not even exist in the underlying
 335                         //      library of supported bitrates.  Of course since this value is ignored we can freely make a bogus one
 336                         //      for the UI just to make the user a little more aware.
 337                         missingBitRate = [NSDictionary dictionaryWithObjectsAndKeys:
 338                                                           [NSString stringWithFormat: @"%d", trackInputBitRate], keyAudioBitrateName,
 339                                                           [NSNumber numberWithInt: trackInputBitRate], keyAudioBitrate,
 340                                                           nil];
 341                         }
 342                 [permittedBitRates addObject: missingBitRate];
 343         }
 344
 345         if (NO == [self enabled]) {
 346                 permittedBitRates = nil;
 347         }
 348
 349         //      Make sure we are updated with the permitted list
 350         [self setBitRates: permittedBitRates];
 351
 352         //      Select the proper one
 353         if (YES == shouldSetDefault) {
 354                 [self setBitRateFromName: [NSString stringWithFormat:@"%d", theDefaultBitRate]];
 355                 }
 356
 357         if (nil == [self bitRate] || NO == [permittedBitRates containsObject: [self bitRate]]) {
 358                 [self setBitRate: [permittedBitRates lastObject]];
 359         }
 360
 361         return;
 362 }
 363
 364 - (id) init
 365
 366 {
 367         if (self = [super init]) {
 368                 [self addObserver: self forKeyPath: @"videoContainerTag" options: 0 context: NULL];
 369                 [self addObserver: self forKeyPath: @"track" options: NSKeyValueObservingOptionOld context: NULL];
 370                 [self addObserver: self forKeyPath: @"codec" options: 0 context: NULL];
 371                 [self addObserver: self forKeyPath: @"mixdown" options: 0 context: NULL];
 372                 [self addObserver: self forKeyPath: @"sampleRate" options: 0 context: NULL];
 373                 }
 374         return self;
 375 }
 376
 377 #pragma mark -
 378 #pragma mark Accessors
 379
 380 @synthesize track;
 381 @synthesize codec;
 382 @synthesize mixdown;
 383 @synthesize sampleRate;
 384 @synthesize bitRate;
 385 @synthesize drc;
 386 @synthesize videoContainerTag;
 387 @synthesize controller;
 388
 389 @synthesize codecs;
 390 @synthesize mixdowns;
 391 @synthesize bitRates;
 392
 393 - (NSArray *) tracks    {       return [controller masterTrackArray];   }
 394
 395 - (NSArray *) sampleRates       {       return masterSampleRateArray;   }
 396
 397 - (void) dealloc
 398
 399 {
 400         [self removeObserver: self forKeyPath: @"videoContainerTag"];
 401         [self removeObserver: self forKeyPath: @"track"];
 402         [self removeObserver: self forKeyPath: @"codec"];
 403         [self removeObserver: self forKeyPath: @"mixdown"];
 404         [self removeObserver: self forKeyPath: @"sampleRate"];
 405         [self setTrack: nil];
 406         [self setCodec: nil];
 407         [self setMixdown: nil];
 408         [self setSampleRate: nil];
 409         [self setBitRate: nil];
 410         [self setDrc: nil];
 411         [self setVideoContainerTag: nil];
 412         [self setCodecs: nil];
 413         [self setMixdowns: nil];
 414         [self setBitRates: nil];
 415         [super dealloc];
 416         return;
 417 }
 418
 419 #pragma mark -
 420 #pragma mark KVO
 421
 422 - (void) observeValueForKeyPath: (NSString *) keyPath ofObject: (id) object change: (NSDictionary *) change context: (void *) context
 423
 424 {
 425         if (YES == [keyPath isEqualToString: @"videoContainerTag"]) {
 426                 [self updateCodecs];
 427                 }
 428         else if (YES == [keyPath isEqualToString: @"track"]) {
 429                 if (nil != [self track]) {
 430                         [self updateCodecs];
 431                         [self updateMixdowns: YES];
 432                         if (YES == [self enabled]) {
 433                                 [self setSampleRate: [[self sampleRates] objectAtIndex: 0]];    // default to Auto
 434                                 }
 435                         if (YES == [[controller noneTrack] isEqual: [change objectForKey: NSKeyValueChangeOldKey]]) {
 436                                 [controller switchingTrackFromNone: self];
 437                                 }
 438                         if (YES == [[controller noneTrack] isEqual: [self track]]) {
 439                                 [controller settingTrackToNone: self];
 440                                 }
 441                         }
 442                 }
 443         else if (YES == [keyPath isEqualToString: @"codec"]) {
 444                 [self updateMixdowns: YES];
 445                 [self updateBitRates: YES];
 446                 }
 447         else if (YES == [keyPath isEqualToString: @"mixdown"]) {
 448                 [self updateBitRates: YES];
 449                 [[NSNotificationCenter defaultCenter] postNotificationName: HBMixdownChangedNotification object: self];
 450                 }
 451         else if (YES == [keyPath isEqualToString: @"sampleRate"]) {
 452                 [self updateBitRates: NO];
 453                 }
 454         return;
 455 }
 456
 457 #pragma mark -
 458 #pragma mark Special Setters
 459
 460 - (void) setTrackFromIndex: (int) aValue
 461
 462 {
 463         [self setTrack: [[self tracks] dictionaryWithObject: [NSNumber numberWithInt: aValue] matchingKey: keyAudioTrackIndex]];
 464         return;
 465 }
 466
 467 //      This returns whether it is able to set the actual codec desired.
 468 - (BOOL) setCodecFromName: (NSString *) aValue
 469
 470 {
 471         NSDictionary *dict = [[self codecs] dictionaryWithObject: aValue matchingKey: keyAudioCodecName];
 472
 473         if (nil != dict) {
 474                 [self setCodec: dict];
 475         }
 476         return (nil != dict);
 477 }
 478
 479 - (void) setMixdownFromName: (NSString *) aValue
 480
 481 {
 482         NSDictionary *dict = [[self mixdowns] dictionaryWithObject: aValue matchingKey: keyAudioMixdownName];
 483
 484         if (nil != dict) {
 485                 [self setMixdown: dict];
 486         }
 487         return;
 488 }
 489
 490 - (void) setSampleRateFromName: (NSString *) aValue
 491
 492 {
 493         NSDictionary *dict = [[self sampleRates] dictionaryWithObject: aValue matchingKey: keyAudioSampleRateName];
 494
 495         if (nil != dict) {
 496                 [self setSampleRate: dict];
 497         }
 498         return;
 499 }
 500
 501 - (void) setBitRateFromName: (NSString *) aValue
 502
 503 {
 504         NSDictionary *dict = [[self bitRates] dictionaryWithObject: aValue matchingKey: keyAudioBitrateName];
 505
 506         if (nil != dict) {
 507                 [self setBitRate: dict];
 508         }
 509         return;
 510 }
 511
 512
 513 #pragma mark -
 514 #pragma mark Validation
 515
 516 //      Because we have indicated that the binding for the drc validates immediately we can implement the
 517 //      key value binding method to ensure the drc stays in our accepted range.
 518 - (BOOL) validateDrc: (id *) ioValue error: (NSError *) outError
 519
 520 {
 521         BOOL retval = YES;
 522
 523         if (nil != *ioValue) {
 524                 if (0.0 < [*ioValue floatValue] && 1.0 > [*ioValue floatValue]) {
 525                         *ioValue = [NSNumber numberWithFloat: 1.0];
 526                 }
 527         }
 528
 529         return retval;
 530 }
 531
 532 #pragma mark -
 533 #pragma mark Bindings Support
 534
 535 - (BOOL) enabled
 536
 537 {
 538         return (nil != track) ? (NO == [track isEqual: [controller noneTrack]]) : NO;
 539 }
 540
 541 - (BOOL) mixdownEnabled
 542
 543 {
 544         BOOL retval = [self enabled];
 545
 546         if (YES == retval) {
 547                 int myMixdown = [[[self mixdown] objectForKey: keyAudioMixdown] intValue];
 548                 if (HB_ACODEC_AC3_PASS == myMixdown || HB_ACODEC_DCA_PASS == myMixdown) {
 549                         retval = NO;
 550                 }
 551         }
 552         return retval;
 553 }
 554
 555 - (BOOL) AC3Enabled
 556
 557 {
 558         BOOL retval = [self enabled];
 559
 560         if (YES == retval) {
 561                 int myTrackCodec = [[[self track] objectForKey: keyAudioInputCodec] intValue];
 562                 int myCodecCodec = [[[self codec] objectForKey: keyAudioCodec] intValue];
 563                 if (HB_ACODEC_AC3 != myTrackCodec || HB_ACODEC_AC3_PASS == myCodecCodec) {
 564                         retval = NO;
 565                 }
 566         }
 567         return retval;
 568 }
 569
 570 + (NSSet *) keyPathsForValuesAffectingValueForKey: (NSString *) key
 571
 572 {
 573         NSSet *retval = nil;
 574
 575         if (YES == [key isEqualToString: @"enabled"]) {
 576                 retval = [NSSet setWithObjects: @"track", nil];
 577                 }
 578         else if (YES == [key isEqualToString: @"AC3Enabled"]) {
 579                 retval = [NSSet setWithObjects: @"track", @"codec", nil];
 580         }
 581         else if (YES == [key isEqualToString: @"mixdownEnabled"]) {
 582                 retval = [NSSet setWithObjects: @"track", @"mixdown", nil];
 583                 }
 584         return retval;
 585 }
 586
 587 @end