ArkTS音频播放,音频播放的主要工作是将音频数据转码为可听见的音频模拟信号并通过输出设备进行播放

export class AudioModel { 
  private audioPlayer = undefined; 
 
  initAudioPlayer(handleStateChange: () => void) { 
    this.release() 
    this.audioPlayer = media.createAudioPlayer() 
    //完成音频数据加载 
    this.audioPlayer.on('dataLoad', () => { 
      Logger.info(TAG, `case dataLoad called`) 
      this.audioPlayer.play(); // 调用play方法开始播放，触发'play'事件回调 
    }) 
    //音频播放 
    this.audioPlayer.on('play', () => { 
      console.info('audio play success'); 
      handleStateChange() 
    }) 
    //音频暂停播放 
    this.audioPlayer.on('pause', () => { 
      console.info('audio pause success'); 
      handleStateChange() 
    }) 
    //音频播放完成 
    this.audioPlayer.on('finish', () => { // 设置'finish'事件回调，播放完成触发 
      Logger.info(TAG, `audioPlayer finish called`) 
      handleStateChange() 
    }); 
    //音频停止播放 
    this.audioPlayer.on('stop', () => { 
      Logger.info(TAG, `audioPlayer stop called`) 
      this.audioPlayer.release() //audioPlayer资源被销毁 
      this.audioPlayer = undefined 
    }) 
    //音频播放错误 
    this.audioPlayer.on('error', () => { 
      Logger.info(TAG, `audioPlayer error called`) 
      handleStateChange() 
    }) 
  } 
}
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startAudio(pathName: string) { 
  if(typeof (this.audioPlayer) != `undefined`) { 
      Logger.info(TAG, `audioPlayer  startAudio`) 
      this.audioPlayer.reset() 
      this.audioPlayer.src = pathName 
  }    
}
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release() { 
  if (typeof (this.audioPlayer) != `undefined`) { 
    Logger.info(TAG, `audioPlayer  release`) 
    this.audioPlayer.release() 
    this.audioPlayer = undefined 
  } 
} 
 
pause() { 
  Logger.info(TAG, 'audioPlayer pause called') 
  if (typeof (this.audioPlayer) != `undefined`) { 
    this.audioPlayer.pause() 
  } 
} 
 
finish() { 
  if (typeof (this.audioPlayer) != `undefined`) { 
    this.audioPlayer.stop() 
  } 
}
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