HarmonyOS 鸿蒙Next 请问使用AVPlayer播放.wav文件 隔一次可以正常播放是什么原因

import media from ‘@ohos.multimedia.media’;
import common from ‘@ohos.app.ability.common’;
import { BusinessError } from ‘@ohos.base’;
import fs from ‘@ohos.file.fs’;

export class AVPlayerDemo {
private avPlayer: media.AVPlayer | undefined
private count: number = 0;
private isSeek: boolean = true; // 用于区分模式是否支持seek操作
constructor() {
media.createAVPlayer((error: BusinessError, video: media.AVPlayer) => {
if (video != null) {
this.avPlayer = video;
console.info(‘Succeeded666 in creating AVPlayer’);
} else {
console.error(Failed to create AVPlayer, error message:${error.message});
}
})
}
// 注册avplayer回调函数
setAVPlayerCallback(avPlayer: media.AVPlayer) {
// seek操作结果回调函数
avPlayer.on(‘seekDone’, (seekDoneTime: number) => {
console.info(AVPlayer seek succeeded, seek time is ${seekDoneTime});
})
// error回调监听函数,当avPlayer在操作过程中出现错误时调用 reset接口触发重置流程
avPlayer.on(‘error’, (err: BusinessError) => {
console.error(Invoke avPlayer failed, code is ${err.code}, message is ${err.message});
avPlayer.reset(); // 调用reset重置资源，触发idle状态
})
// 状态机变化回调函数
avPlayer.on(‘stateChange’, async (state: string, reason: media.StateChangeReason) => {
switch (state) {
case ‘idle’: // 成功调用reset接口后触发该状态机上报
console.info(‘AVPlayer state idle called.’);
avPlayer.release(); // 调用release接口销毁实例对象
break;
case ‘initialized’: // avplayer 设置播放源后触发该状态上报
console.info(‘AVPlayer state initialized called.’);
avPlayer.prepare();
break;
case ‘prepared’: // prepare调用成功后上报该状态机
console.info(‘AVPlayer state prepared called.’);
avPlayer.play(); // 调用播放接口开始播放
break;
case ‘playing’: // play成功调用后触发该状态机上报
console.info(‘AVPlayer state playing called.’);
if (this.count !== 0) {
if (this.isSeek) {
console.info(‘AVPlayer start to seek.’);
avPlayer.seek(avPlayer.duration); //seek到音频末尾
} else {
// 当播放模式不支持seek操作时继续播放到结尾
console.info(‘AVPlayer wait to play end.’);
}
} else {
// avPlayer.pause(); // 调用暂停接口暂停播放
}
this.count++;
break;
case ‘paused’: // pause成功调用后触发该状态机上报
console.info(‘AVPlayer state paused called.’);
// avPlayer.play(); // 再次播放接口开始播放
break;
case ‘completed’: // 播放结束后触发该状态机上报
console.info(‘AVPlayer state completed called.’);
// avPlayer.stop(); //调用播放结束接口
break;
case ‘stopped’: // stop接口成功调用后触发该状态机上报
console.info(‘AVPlayer state stopped called.’);
// avPlayer.reset(); // 调用reset接口初始化avplayer状态
break;
case ‘released’:
console.info(‘AVPlayer state released called.’);
this.avPlayer = await media.createAVPlayer()
this.avPlayer.prepare()
break;
default:
console.info(‘AVPlayer state unknown called.’);
break;
}
})
}
// 以下demo为使用资源管理接口获取打包在HAP内的媒体资源文件并通过fdSrc属性进行播放示例
async avPlayerFdSrcDemo() {
// 创建状态机变化回调函数
this.setAVPlayerCallback(this.avPlayer!);
// 通过UIAbilityContext的resourceManager成员的getRawFd接口获取媒体资源播放地址
// 返回类型为{fd,offset,length},fd为HAP包fd地址，offset为媒体资源偏移量，length为播放长度
let context = getContext(this) as common.UIAbilityContext;
let fileDescriptor = await context.resourceManager.getRawFd(‘11582.mp3’);
// let fileDescriptor = await context.resourceManager.getRawFd(‘1.wav’);
let avFileDescriptor: media.AVFileDescriptor =
{ fd: fileDescriptor.fd, offset: fileDescriptor.offset, length: fileDescriptor.length };
this.isSeek = false; // 支持seek操作
// 为fdSrc赋值触发initialized状态机上报
this.avPlayer!.fdSrc = avFileDescriptor;
}
// 以下demo为使用fs文件系统打开沙箱地址获取媒体文件地址并通过url属性进行播放示例
// async avPlayerUrlDemo(path: string) {
// // 创建avPlayer实例对象
// let avPlayer: media.AVPlayer = await media.createAVPlayer();
// // 创建状态机变化回调函数
// this.setAVPlayerCallback(avPlayer);
// let fdPath = ‘fd://’;
// // 通过UIAbilityContext获取沙箱地址filesDir，以Stage模型为例
// // let context = getContext(this) as common.UIAbilityContext;
// // let pathDir = context.filesDir;
// // let path = pathDir + ‘/pCdJNp/1.wav’;
// // console.log(path123456: ${path});
// // 打开相应的资源文件地址获取fd，并为url赋值触发initialized状态机上报
// let file = await fs.open(path);
// fdPath = fdPath + ‘’ + file.fd;
// this.isSeek = true; // 支持seek操作
// avPlayer.url = fdPath;
// }
// 以下demo为使用fs文件系统打开沙箱地址获取媒体文件地址并通过url属性进行播放示例
async avPlayerUrlDemo(path: string) {
// 创建avPlayer实例对象
// let avPlayer: media.AVPlayer = await media.createAVPlayer();
// 创建状态机变化回调函数
this.setAVPlayerCallback(this.avPlayer!);
let fdPath = ‘fd://’;
// 打开相应的资源文件地址获取fd，并为url赋值触发initialized状态机上报
let file = await fs.open(path);
fdPath = fdPath + ‘’ + file.fd;
let avFileDescriptor: media.AVFileDescriptor =
{ fd: file.fd };
this.isSeek = false; // 支持seek操作
// 为fdSrc赋值触发initialized状态机上报
this.avPlayer!.fdSrc = avFileDescriptor;
}
async stop() {
this.avPlayer?.stop()
}
async play() {
this.avPlayer?.play()
}
async reset() {
this.avPlayer?.reset()
}
async pause() {
this.avPlayer?.pause()
}
}
使用avPlayerUrlDemo这个方法播放，第一次正常播放，第二次没有声音，第三次正常播放