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iOS语音合成

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在iOS中音频按照播放形式可以分为音效播放和音乐播放。音效主要指的是一些短音频，通常作为点缀音频，如提示音，对于这类音频不需要进行进度，循环等控制。音乐主要指的是一些较长的音频，通常是主音频，对于这类音频播放通常需要精确的控制。在iOS中播放音效一般使用AudioToolbox.framework这个框架，播放音乐一般使用AVFoundation.framework

语音合成

苹果的语音合成比较简单，直接上代码

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@protocol RBAppleSpeechSynthesizeDelegate<NSObject>
@required
- (void)appleSynthesizerWithResult:(NSString *)status info:(NSString *)info;
@end

@interface RBAppleSpeechSynthesize : NSObject
@property(nonatomic, weak) id<RBAppleSpeechSynthesizeDelegate> delegate;

+ (RBAppleSpeechSynthesize *)sharedInstance;
- (void)appleStartSpeak:(NSString *)string;
- (void)appleStopSpeak;
- (void)appleCancel;

@end
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@interface RBAppleSpeechSynthesize ()<AVSpeechSynthesizerDelegate>

/*
 AVSpeechSynthesizer: 语音合成器, 可以假想成一个可以说话的人, 是最主要的接口
 AVSpeechSynthesisVoice: 可以假想成人的声音
 AVSpeechUtterance: 可以假想成要说的一段话
 */
@property(nonatomic, strong) AVSpeechSynthesizer *synthesizer;  //合成器
@property(nonatomic, strong) AVSpeechSynthesisVoice *synthesizeVoice;  //声音
@property(nonatomic, strong) AVSpeechUtterance *speechUtterance;       //文字
@end

@implementation RBAppleSpeechSynthesize

+ (RBAppleSpeechSynthesize *)sharedInstance {
  static RBAppleSpeechSynthesize *singleSynthesize = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    singleSynthesize = [[RBAppleSpeechSynthesize alloc] init];
  });
  return singleSynthesize;
}

- (instancetype)init {
  self = [super init];
  if (self) {
    [self initAppleSysthesize];
  }
  return self;
}

- (void)initAppleSysthesize {
  self.synthesizer = [[AVSpeechSynthesizer alloc] init];
  self.synthesizer.delegate = self;
  self.synthesizeVoice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"];
}
- (void)appleStartSpeak:(NSString *)string {
  //开始语音合成
  if (string != nil) {
    NSString *tempStr =[string stringByReplacingOccurrencesOfString:@" " withString:@""];
    if (tempStr.length > 0) {
      if (self.synthesizer.isSpeaking) {
        //暂停说话
        BOOL stoped =[self.synthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
        if (stoped) {
          [self speechWithString:tempStr];
        }
      } else {
        [self speechWithString:tempStr];
      }
    }
  }
}
- (void)speechWithString:(NSString *)string {
  AVAudioSession *avSession = [AVAudioSession sharedInstance];
  NSError *avError = nil;
  [avSession setCategory:AVAudioSessionCategoryPlayback error:&avError];
  if (avError) {
    NSLog(@"AVAudioSession category error:[%@]", avError.localizedDescription);
  }
  [avSession setActive:YES withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];//AVAudioSession会影响其他App的表现，当自己App的Session被激活，其他App的就会被解除激活
  self.speechUtterance = [AVSpeechUtterance speechUtteranceWithString:string];
  self.speechUtterance.voice = self.synthesizeVoice;
  self.speechUtterance.rate = 0.52;   //设置语速
  self.speechUtterance.volume = 1.0;  //设置音量
  self.speechUtterance.pitchMultiplier =1;  // 在播放特定语句时改变声音的声调,// 一般取值介于0.5(底音调)~2.0(高音调)之间
  [self.synthesizer speakUtterance:self.speechUtterance];
}

- (void)appleStopSpeak {
  [self.synthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
}

- (void)appleCancel {
  [self.synthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
  self.synthesizer.delegate = nil;
  self.synthesizer = nil;
  self.synthesizeVoice = nil;
  self.speechUtterance = nil;
}

#pragma mark - AVSpeechSynthesizerDelegate
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer
    didStartSpeechUtterance:(AVSpeechUtterance *)utterance {
  // NSLog(@"语音合成开始!");
}
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer
    didFinishSpeechUtterance:(AVSpeechUtterance *)utterance {
  // NSLog(@"语音合成结束!");
}

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didCancelSpeechUtterance:(AVSpeechUtterance *)utterance {
    //NSLog(@"语音合成取消!");
}

@end

使用语音合成可以避免倒入音频资源，从而增大安装包的大小。

参考

  1. iOS语音识别和语音合成