HarmonyOS 鸿蒙Next 音频编解码问题咨询

参考示例

import { BusinessError } from '[@ohos](/user/ohos).base';
import { common } from '[@kit](/user/kit).AbilityKit';
import { util } from '[@kit](/user/kit).ArkTS';
import fs from '[@ohos](/user/ohos).file.fs';

[@Entry](/user/Entry)
[@Component](/user/Component) struct base64video{
 private context = getContext(this) as common.UIAbilityContext
 private base: string = ''
 private base_1: string = ''

 encodeAudio() {
   try {
     this.context.resourceManager.getRawFileContent("ttt.m4a").then((value: Uint8Array) => {
       let rawFile = value;
       this.base = new util.Base64Helper().encodeToStringSync(rawFile)
     }).catch((error: BusinessError) => {
       console.error("getRawFileContent promise error is " + error);
     });
   } catch (error) {
     let code = (error as BusinessError).code;
     let message = (error as BusinessError).message;
     console.error(`promise getRawFileContent failed, error code: ${code}, message: ${message}.`);
   }
 }
 decodeAudio() {
   let pathDir = this.context.filesDir;
   let filePath = pathDir + `/test.m4a`
   let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
   let result = new util.Base64Helper().decodeSync(this.base);
   let writeLen = fs.writeSync(file.fd, result.buffer)
   fs.close(file)
 }

 async encodeAgain() {
   let pathDir = this.context.filesDir;
   let filePath = pathDir + `/test.m4a`
   let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
   let stat = fs.statSync(file.fd)
   let buf = new ArrayBuffer(stat.size)
   await fs.read(file.fd, buf)
   this.base_1 = new util.Base64Helper().encodeToStringSync(new Uint8Array(buf))
   fs.close(file)
 }

 decodeAgain() {
   let pathDir = this.context.filesDir;
   let filePath = pathDir + `/test_1.m4a`
   let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
   let result = new util.Base64Helper().decodeSync(this.base_1);
   let writeLen = fs.writeSync(file.fd, result.buffer)
   fs.close(file)
 }

 build(){
   Column(){
     Button('音频编码').onClick(()=>{ this.encodeAudio() })
     Button('音频解码并保存').onClick(()=>{ this.decodeAudio() })
     Button('重复编码').onClick(()=>{ this.encodeAgain() })
     Button('重复解码并保存').onClick(()=>{ this.decodeAgain() })
   }
 }
}