#鸿蒙通关秘籍#如何在HarmonyOS中通过AudioCapturer监听并处理音频数据？

在HarmonyOS中使用AudioCapturer监听和处理音频数据需要按以下步骤操作：

1. 创建AudioCapturer实例并设置参数

   使用合适的音频参数来创建实例：

   import { audio } from '@kit.AudioKit';
   
   let audioStreamInfo = {
     samplingRate: audio.AudioSamplingRate.SAMPLE_RATE_48000,
     channels: audio.AudioChannel.CHANNEL_2,
     sampleFormat: audio.AudioSampleFormat.SAMPLE_FORMAT_S16LE,
     encodingType: audio.AudioEncodingType.ENCODING_TYPE_RAW
   };
   
   let audioCapturerOptions = {
     streamInfo: audioStreamInfo,
     capturerInfo: {
       source: audio.SourceType.SOURCE_TYPE_MIC,
       capturerFlags: 0
     }
   };
   
   audio.createAudioCapturer(audioCapturerOptions, (err, data) => {
     if (err) {
       console.error(`Create AudioCapturer failed: ${err.code}, ${err.message}`);
     } else {
       let audioCapturer = data;
     }
   });
   

2. 监听音频数据

   利用on('readData')方法监听音频数据并处理：

   let bufferSize = 0;
   let path = getContext().cacheDir;
   let filePath = path + '/output.pcm';
   let file = fileIo.openSync(filePath, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
   
   let readDataCallback = (buffer) => {
     let options = {
       offset: bufferSize,
       length: buffer.byteLength
     };
     fileIo.writeSync(file.fd, buffer, options);
     bufferSize += buffer.byteLength;
   };
   
   audioCapturer.on('readData', readDataCallback);
   

3. 开始采集音频

   当准备工作完成后，可以开始音频采集：

   audioCapturer.start((err) => {
     if (err) {
       console.error('Audio capturing start failed.');
     } else {
       console.info('Audio capturing started successfully.');
     }
   });