HarmonyOS 鸿蒙Next 使用avrecord录制出来的音频为空文件，请帮忙看看,demo如下

HarmonyOS 鸿蒙Next 使用avrecord录制出来的音频为空文件，请帮忙看看,demo如下

Index.ets

import { AudioRecorderDemo } from '../utils/AudioRecord';


@Entry
@Component
struct Index {
@State avRecord: AudioRecorderDemo = new AudioRecorderDemo();
build() {
Column() {
Button('录制声音').onClick(() => {
let fileName = 'Audio_' + new Date().getTime() + '.wav'
this.avRecord.startRecordingProcess(fileName)
console.log('语音文件', '/data/storage/el2/base/files/chat/audio/' + fileName)
})
Button('结束录制').onClick(()=>{
this.avRecord.stopRecordingProcess()
})
}
.width('100%')
.height('100%')
.justifyContent(FlexAlign.Center)
}
}


AudioRecord.ets
import { media } from '@kit.MediaKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { fileIo } from '@kit.CoreFileKit';
import fs from '@ohos.file.fs';

export class AudioRecorderDemo {
private curFile: fileIo.File | undefined = undefined;
private avRecorder: media.AVRecorder | undefined = undefined;
private 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，当前只支持aac
audioSampleRate: 48000, // 音频采样率
fileFormat: media.ContainerFormatType.CFT_MPEG_4A, // 封装格式，当前只支持m4a
};
private 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: '', // 参考应用文件访问与管理开发示例新建并读写一个文件
};

// 注册audioRecorder回调函数
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(`AudioRecorder current state is ${state}`);
})
// 错误上报回调函数
this.avRecorder.on('error', (err: BusinessError) => {
console.error(`AudioRecorder failed, code is ${err.code}, message is ${err.message}`);
})
}
}

// 开始录制对应的流程
// async startRecordingProcess(fileName: string) {
// if (this.avRecorder != undefined) {
// await this.avRecorder.release();
// this.avRecorder = undefined;
// }
// // 1.创建录制实例
// this.avRecorder = await media.createAVRecorder();
// this.setAudioRecorderCallback();
// // 创建语音存放文件夹
// let res = fs.accessSync('/data/storage/el2/base/files/chat/audio');
// if (!res) {
// fs.mkdirSync('/data/storage/el2/base/files/chat/audio', true);
// }
// // 2.获取录制文件fd赋予avConfig里的url；参考FilePicker文档
// this.curFile = fileIo.openSync('/data/storage/el2/base/files/chat/audio/' + fileName, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
// this.avConfig.url = 'fd://' + this.curFile.fd;
// // 3.配置录制参数完成准备工作
// await this.avRecorder.prepare(this.avConfig);
// // 4.开始录制
// await this.avRecorder.start();
// }


async startRecordingProcess(fileName: string) {
console.log('语音文件', '/data/storage/el2/base/files/chat/audio/' + fileName)
// 创建语音存放文件夹
let res = fs.accessSync('/data/storage/el2/base/files/chat/audio');
if (!res) {
fs.mkdirSync('/data/storage/el2/base/files/chat/audio', true);
}
try {
if (this.avRecorder == undefined) {
// 1.创建录制实例
this.avRecorder = await media.createAVRecorder();
}
this.setAudioRecorderCallback();
// 2.获取录制文件fd赋予avConfig里的url；参考FilePicker文档
this.curFile = fileIo.openSync('/data/storage/el2/base/files/chat/audio/' + fileName, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
this.avConfig.url = 'fd://' + this.curFile.fd;
// 3.配置录制参数完成准备工作
await this.avRecorder.prepare(this.avConfig);
// 4.开始录制
await this.avRecorder.start();
} catch (err) {
}
}

// 暂停录制对应的流程
async pauseRecordingProcess() {
if (this.avRecorder != undefined && this.avRecorder.state === 'started') { // 仅在started状态下调用pause为合理状态切换
await this.avRecorder.pause();
}
}

// 恢复录制对应的流程
async resumeRecordingProcess() {
if (this.avRecorder != undefined && this.avRecorder.state === 'paused') { // 仅在paused状态下调用resume为合理状态切换
await this.avRecorder.resume();
}
}

// 停止录制对应的流程
async stopRecordingProcess() {
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
fileIo.closeSync(this.curFile)
}
}

// 一个完整的【开始录制-暂停录制-恢复录制-停止录制】示例
// async audioRecorderDemo() {
// await this.startRecordingProcess('test.wav'); // 开始录制
// // 用户此处可以自行设置录制时长，例如通过设置休眠阻止代码执行
// await this.pauseRecordingProcess(); //暂停录制
// await this.resumeRecordingProcess(); // 恢复录制
// await this.stopRecordingProcess(); // 停止录制
// }
}