HarmonyOS 鸿蒙Next AVRecorder进行音频录制时，音频的时长与实际的不符（比实际的时长短）

[@lichengg](/user/lichengg) 这是我项目中录制语音的帮助类，你写几个按钮调用看看。今天试还是存在我说的那个问题的：

const TAG = 'VoiceRecordHelper'
export class VoiceRecordHelper {
private avRecorder: media.AVRecorder | undefined = undefined;
//音视频录制的配置文件。
private readonly avProfile: media.AVRecorderProfile = {
audioBitrate: 100000, // 音频比特率
audioChannels: 2, // 音频声道数
audioCodec: media.CodecMimeType.AUDIO_AAC, // 音频编码格式，当前支持ACC，MP3，G711MU
audioSampleRate: 48000, // 音频采样率
fileFormat: media.ContainerFormatType.CFT_MPEG_4A, // 封装格式，当前支持MP4，M4A，MP3，WAV
}
private voiceFile: fileIo.File
private recordCallback: RecordCallback
private recordDuration: number = 0
private progressIntervalId: number = -1
private startTime: number = 0
constructor(saveVoiceFile: fileIo.File, recordCallback: RecordCallback) {
this.voiceFile = saveVoiceFile
this.recordCallback = recordCallback
this.recordDuration = 0
}
//开始
public start() {
new Promise <void>(async (resolve: Function, reject: Function) => {
let avConfig: media.AVRecorderConfig = {
audioSourceType: media.AudioSourceType.AUDIO_SOURCE_TYPE_MIC, // 音频输入源，这里设置为麦克风
profile: this.avProfile,
url: ‘fd://’ + this.voiceFile.fd, // 参考应用文件访问与管理开发示例新建并读写一个文件
}
  <span class="hljs-keyword">try</span> {
    <span class="hljs-keyword">if</span> (<span class="hljs-keyword">this</span>.avRecorder != <span class="hljs-literal">undefined</span>) {
      await <span class="hljs-keyword">this</span>.avRecorder.release();
      <span class="hljs-keyword">this</span>.avRecorder = <span class="hljs-literal">undefined</span>;
    }
    <span class="hljs-comment">// 1.创建录制实例</span>
    <span class="hljs-keyword">this</span>.avRecorder = await media.createAVRecorder();
    <span class="hljs-comment">//设置error和status回调监听</span>
    <span class="hljs-keyword">this</span>.setAudioRecorderCallback();
    <span class="hljs-comment">// 2.获取录制文件fd赋予avConfig里的url；参考FilePicker文档</span>

    <span class="hljs-comment">// 3.配置录制参数完成准备工作</span>
    await <span class="hljs-keyword">this</span>.avRecorder.prepare(avConfig);
    <span class="hljs-comment">// 4.开始录制</span>
    await <span class="hljs-keyword">this</span>.avRecorder.start();
    resolve()
  } <span class="hljs-keyword">catch</span> (e) {
    reject(e)
  }

}).then(() =&gt; {
  console.log(TAG, <span class="hljs-string">'开始录制'</span>)
}).catch((error: <span class="hljs-built_in">Error</span>) =&gt; {
  console.log(TAG, <span class="hljs-string">'开始录制出错：'</span>, error)
  <span class="hljs-keyword">this</span>.recordCallback.onError(error)
})
}
// 停止录制对应的流程
public stop() {
new Promise <void>(async (resolve: Function, reject: Function) => {
try {
if (this.avRecorder != undefined) {
// 1. 停止录制
if (this.avRecorder.state === ‘started’
|| this.avRecorder.state === ‘paused’) { // 仅在started或者paused状态下调用stop为合理状态切换
await this.avRecorder.stop();
}
// 2.重置
await this.avRecorder.reset();
// 3.释放录制实例
await this.avRecorder.release();
this.avRecorder = undefined;
// 4.关闭录制文件fd
}
resolve()
} catch (e) {
reject(e)
}
}).then(() => {
//  don’t have to do anything
}).catch((error: <span class="hljs-built_in">Error</span>) =&gt; {
  <span class="hljs-keyword">this</span>.recordCallback.onError(error)
})

<span class="hljs-comment">//停止Progress</span>
<span class="hljs-keyword">if</span> (<span class="hljs-keyword">this</span>.progressIntervalId != -<span class="hljs-number">1</span>) {
  clearInterval(<span class="hljs-keyword">this</span>.progressIntervalId)
}
}
//每秒轮询生成一个伪进度
private doIntervalProgress() {
this.progressIntervalId = setInterval(() => {
if (this.startTime != 0) {
this.recordDuration = Math.floor((Date.now() - this.startTime) / 1000)
this.recordCallback.onProgress(this.recordDuration)
}
}, 1000)
}
// 注册audioRecorder回调函数
private setAudioRecorderCallback() {
if (this.avRecorder != undefined) {
// 状态机变化回调函数
this.avRecorder.on(‘stateChange’, (state: media.AVRecorderState, reason: media.StateChangeReason) => {
console.log(TAG, 当前状态 is ${state})
if (state == ‘started’) {
//开始
this.startTime = Date.now()
this.recordCallback.onStart()
this.doIntervalProgress()
} else if (state == ‘stopped’) {
//完成
this.recordCallback.onSuccess({
voiceFile: this.voiceFile,
voiceDuration: this.recordDuration
})
}
})
// 错误上报回调函数
this.avRecorder.on(‘error’, (err: BusinessError) => {
console.error(TAG, 出错, code is ${err.code}, message is ${err.message});
this.recordCallback.onError(err)
})
}
}
}
export interface RecordCallback {
onStart: () => void
/**

录制中时的进度
@param progress 单是秒
/
onProgress: (progress: number) => void
/*
出错
@param error
/
onError: (error: Error) => void
/*
录制成功
@param result
*/
onSuccess: (result: RecordResult) => void

}
export interface RecordResult {
voiceFile: fileIo.File,
voiceDuration: number
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>