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iOS におけるサウンド処理2015
- 2. • me.name = “Tamiya Tokihiko” • me.company = “Classmethod, Inc.” • company.blog = “Developers.IO” 自己紹介（プロパティ）
- 3. 概要 • AVAudioEngine • iOS 8 から加わったクラス • Audio Unit Extension • iOS 9 で追加されたExtension Point • Audio Unit をアプリ間で共有できる • AVAudioSessionModeSpokenAudio • 声コンテンツが他アプリの音声の妨げにならない仕組み
- 6. © Apple
- 8. © Apple
- 9. AVAudioEngine AVAudioPlayer Node AVAudioUnit Delay AVAudioMixer Node AVAudio OutputNode AVAudioFile
- 10. @property (nonatomic, strong) AVAudioEngine *engine; @property (nonatomic, strong) AVAudioPlayerNode *audioPlayerNode; @property (nonatomic, strong) AVAudioFile *audioFile; @property (nonatomic, strong) AVAudioUnitDelay *audioUnitDelay; プロパティ
- 11. self.engine = [AVAudioEngine new]; NSString *path = [[NSBundle mainBundle] pathForResource:@"loop.m4a" ofType:nil]; self.audioFile = [[AVAudioFile alloc] initForReading:[NSURL fileURLWithPath:path] error:nil]; AVAudioEngine と AVAudioFile AVAudioEngine
- 12. self.audioPlayerNode = [AVAudioPlayerNode new]; [self.engine attachNode:self.audioPlayerNode]; AVAudioPlayerNode AVAudioEngine AVAudioPlayer Node
- 13. self.audioUnitDelay = [AVAudioUnitDelay new]; self.audioUnitDelay.wetDryMix = 50; [self.engine attachNode:self.audioUnitDelay]; AVAudioEngine AVAudioPlayer Node AVAudioUnit Delay AVAudioUnitDelay
- 14. AVAudioMixerNode *mixerNode = [self.engine mainMixerNode]; AVAudioEngine AVAudioPlayer Node AVAudioUnit Delay AVAudioMixer Node AVAudioMixerNode を生成
- 19. /*! @property delayTime Time taken by the delayed input signal to reach the output @abstract Range: 0 -> 2 Default: 1 Unit: Seconds */ @property (nonatomic) NSTimeInterval delayTime; /*! @property feedback @abstract Amount of the output signal fed back into the delay line Range: -100 -> 100 Default: 50 Unit: Percent */ @property (nonatomic) float feedback; AVAudioUnitDelay.h
- 20. /*! @property lowPassCutoff @abstract Cutoff frequency above which high frequency content is rolled off Range: 10 -> (samplerate/2) Default: 15000 Unit: Hertz */ @property (nonatomic) float lowPassCutoff; /*! @property wetDryMix @abstract Blend of the wet and dry signals Range: 0 (all dry) -> 100 (all wet) Default: 100 Unit: Percent */ @property (nonatomic) float wetDryMix; AVAudioUnitDelay.h
- 21. demo
- 23. © Apple
- 25. @property (nonatomic) AVAudioEngine *engine; @property (nonatomic) AVAudioPlayerNode *audioPlayerNode; @property (nonatomic) AVAudioFile *file; @property (nonatomic) AUAudioUnit *audioUnit; @property (nonatomic) AVAudioUnit *effect; @property (nonatomic) NSArray *items; プロパティ
- 26. self.audioPlayerNode = [AVAudioPlayerNode new]; self.engine = [AVAudioEngine new]; self.effect = [AVAudioUnit new]; [self.engine attachNode:self.audioPlayerNode];
- 28. AVAudioUnitComponent が入った配列を取得 AudioComponentDescription anyEffectDescription; anyEffectDescription.componentType = kAudioUnitType_Effect; anyEffectDescription.componentSubType = 0; anyEffectDescription.componentManufacturer = 0; anyEffectDescription.componentFlags = 0; anyEffectDescription.componentFlagsMask = 0; self.items = [[AVAudioUnitComponentManager sharedAudioUnitComponentManager] componentsMatchingDescription:anyEffectDescription];
- 29. - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.engine startAndReturnError:nil]; [self scheduleLoop]; [self.audioPlayerNode play]; } - (void)scheduleLoop { [self.audioPlayerNode scheduleFile:self.file atTime:nil completionHandler:^{ [self scheduleLoop]; }]; } AVAudioPlayerNode 再生
- 30. [self.audioPlayerNode pause]; [self.engine disconnectNodeInput:self.effect]; [self.engine disconnectNodeInput:self.engine.mainMixerNode]; [self.engine connect:self.audioPlayerNode to:self.engine.mainMixerNode format:self.file.processingFormat]; self.effect = nil; self.audioUnit = nil; ノードをつなぎ直す
- 31. self.effect = audioUnit; （略） [self.engine connect:self.audioPlayerNode to:self.effect format:self.file.processingFormat]; [self.engine connect:self.effect to:self.engine.mainMixerNode format:self.file.processingFormat]; 特定のエフェクトを実現する AVAudioUnit を取得 [AVAudioUnit instantiateWithComponentDescription:componentDescription options:kAudioComponentInstantiation_LoadOutOfProcess completionHandler:^(__kindof AVAudioUnit * _Nullable audioUnit, NSError * _Nullable error) {}]; AVAudioUnit を使いノードをつなぐ
- 32. AVAudioUnitComponent *auComponent = self.items[indexPath.row - 1]; auComponent.name; auComponent.manufacturerName; AVAudioUnitComponent の名前・製造元
- 33. auComponent = self.items[indexPath.row - 1]; [self selectEffectWithComponentDescription:auComponent .audioComponentDescription];
- 34. [self.audioUnit requestViewControllerWithCompletionHandler: ^(AUViewController * _Nullable viewController) {}]; 独自の View を持っている場合 取得
- 35. demo
- 37. 声のコンテンツでありがちな問題
- 41. 一時停止 ちょっと巻き戻し
- 42. 概要 • AVAudioEngine • iOS 8 から加わったクラス • Audio Unit Extension • iOS 9 で追加されたExtension Point • Audio Unit をアプリ間で共有できる • AVAudioSessionModeSpokenAudio • 声コンテンツが他アプリの音声の妨げにならない仕組み