使用AudioCapturer开发音频录制功能

 import audio from '@ohos.multimedia.audio'; 
  
let audioStreamInfo: audio.AudioStreamInfo = { 
 samplingRate: audio.AudioSamplingRate.SAMPLE_RATE_44100, 
 channels: audio.AudioChannel.CHANNEL_2, 
 sampleFormat: audio.AudioSampleFormat.SAMPLE_FORMAT_S16LE, 
 encodingType: audio.AudioEncodingType.ENCODING_TYPE_RAW 
}; 
  
let audioCapturerInfo: audio.AudioCapturerInfo = { 
source: audio.SourceType.SOURCE_TYPE_MIC, 
 capturerFlags: 0 
}; 
  
let audioCapturerOptions: audio.AudioCapturerOptions = { 
 streamInfo: audioStreamInfo, 
 capturerInfo: audioCapturerInfo 
}; 
  
audio.createAudioCapturer(audioCapturerOptions, (err, data) => { 
  if (err) { 
    console.error(`Invoke createAudioCapturer failed, code is ${err.code}, message is       ${err.message}`); 
 } else { 
   console.info('Invoke createAudioCapturer succeeded.'); 
   let audioCapturer = data; 
 } 
});
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 audioCapturer.start((err: BusinessError) => { 
  if (err) { 
    console.error(`Capturer start failed, code is ${err.code}, message is ${err.message}`); 
  } else { 
    console.info('Capturer start success.'); 
  } 
});
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import fs from '@ohos.file.fs'; 
  
 let context = getContext(this); 
 async function read() { 
 let path = context.filesDir; 
 const filePath = path + '/voice_call_data.wav'; 
 let file: fs.File = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE); 
 let bufferSize: number = await audioCapturer.getBufferSize(); 
 let buffer: ArrayBuffer = await audioCapturer.read(bufferSize, true); 
 fs.writeSync(file.fd, buffer); 
}
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audioCapturer.stop((err: BusinessError) => { 
 if (err) { 
   console.error(`Capturer stop failed, code is ${err.code}, message is ${err.message}`); 
 } else { 
   console.info('Capturer stopped.'); 
 } 
});
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audioCapturer.release((err: BusinessError) => { 
  if (err) { 
    console.error(`capturer release failed, code is ${err.code}, message is ${err.message}`); 
  } else { 
    console.info('capturer released.'); 
  } 
});
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