HarmonyOS 鸿蒙Next AudioCapturer录制的音频使用AVPlayer播放报类型不支持错误怎么解决

 A: pcm格式转wav格式分两个步骤：先构造wav格式的文件头，再将pcm数据写入到wav文件中。

wav格式的文件头构造

//写入wav文件头函数

private writeWaveFileHeader(

out: fs.File,

audioDataSize: number,

totalDataLen: number,

byteRate: number

) {

const header = new ArrayBuffer(44);

const dv = new DataView(header);

const bitsPerSample = 16; // 当前位深是16

// 写入RIFF块

this.writeString(dv, 0, 'RIFF');

dv.setUint32(4, totalDataLen, true);

this.writeString(dv, 8, 'WAVE');

// 写入fmt块

this.writeString(dv, 12, 'fmt ');

dv.setUint32(16, 16, true); // fmt块大小

dv.setUint16(20, 1, true); // 格式类别 (PCM)

dv.setUint16(22, this.mChannel, true); // 通道数

dv.setUint32(24, this.mSampleRate, true); // 采样率

dv.setUint32(28, byteRate, true); // ByteRate 码率

dv.setUint16(32, this.mChannel * bitsPerSample / 8, true); // BlockAlign

dv.setUint16(34, bitsPerSample, true); // 位深

// 写入data块

this.writeString(dv, 36, 'data');

dv.setUint32(40, audioDataSize, true); // 数据块大小

fs.writeSync(out.fd, new Uint8Array(header).buffer, {

length: 44

})

}

​

pcm数据写入到wav文件中

private writePcmData(inFile: fs.File, outFile: fs.File, audioDataSize: number) {

// 写入 pcm 数据

let readSize = 0

let data = new ArrayBuffer(audioDataSize);

let readOptions: ReadOptions = {

offset: readSize,

length: audioDataSize

};

let readLen = fs.readSync(inFile.fd, data, readOptions);

while (readLen > 0) {

readSize += readLen;

fs.writeSync(outFile.fd, data, { length: readLen});

readOptions.offset = readSize;

readLen = fs.readSync(inFile.fd, data, readOptions);

}

fs.closeSync(inFile.fd)

fs.closeSync(outFile.fd)

}

​

音频文件使用base64编码参考

let file = await fileIo.open(this.selectedUri, fileIo.OpenMode.READ_ONLY);

let fileSize = fileIo.statSync(f.fd).size;

console.info('file Size: ' + fileSize);

let buffer = new ArrayBuffer(fileSize);

fileIo.readSync(f.fd, buffer);

fileIo.closeSync(f);

//Base64Helper的构造函数

let base64 = new util.Base64Helper();

//通过输入参数编码后输出Uint8Array对象

let unit8data = base64.encodeSync(new Uint8Array(buffer.slice(0, buffer.byteLength)))

//将字节数组解码为字符串，格式为utf-8

let textDecoder = util.TextDecoder.create('utf-8', { ignoreBOM : true })

let retStr = textDecoder.decodeWithStream( unit8data , {stream: false});