跟着小白一起学鸿蒙—学习使用新媒体播放接口

import media from '@ohos.multimedia.media';

this.avPlayer = await media.createAVPlayer()

/**
   * Creates an AVPlayer instance.
   * @since 9
   * @syscap SystemCapability.Multimedia.Media.AVPlayer
   * @param callback Callback used to return AVPlayer instance if the operation is successful; returns null otherwise.
   * @throws { BusinessError } 5400101 - No memory. Return by callback.
   */
   function createAVPlayer(callback: AsyncCallback<AVPlayer>): void;

  /**
   * Creates an AVPlayer instance.
   * @since 9
   * @syscap SystemCapability.Multimedia.Media.AVPlayer
   * @returns A Promise instance used to return AVPlayer instance if the operation is successful; returns null otherwise.
   * @throws { BusinessError } 5400101 - No memory. Return by promise.
   */
   function createAVPlayer() : Promise<AVPlayer>;

//注册状态变化回调，不同状态时做不同动作
avPlayer.on('stateChange', async (state, reason) => {
  ……
}）
//注册时间变化回调，方便更新进度条时间
avPlayer.on('timeUpdate', (time:number) => {
  ……
})

graph LR
赋值avPlayer.url开始播放 --> 回调进入initialized --> 赋值avPlayer.surfaceId --> avPlayer.prepare --> 回调进入prepared --> avPlayer.play

//视频播放伪代码
async avPlayerDemo() {
    this.avPlayer.on('stateChange', async (state, reason) => {
        switch (state) {
            case 'idle': // 成功调用reset接口后触发该状态机上报
                console.info(TAG + 'state idle called')
                this.avPlayer.release() // 释放avplayer对象
                break;
            case 'initialized': // avplayer 设置播放源后触发该状态上报
                console.info(TAG + 'state initialized called ')
                this.avPlayer.surfaceId = this.surfaceID // 设置显示画面，当播放的资源为纯音频时无需设置
                this.avPlayer.prepare().then(() => {
                    console.info(TAG+ 'prepare success');
                }, (err) => {
                    console.error(TAG + 'prepare filed,error message is :' + err.message)
                })
                break;
            case 'prepared': // prepare调用成功后上报该状态机
                console.info(TAG + 'state prepared called')
                this.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(TAG + 'state playing called')
                if (this.count == 0) {
                    this.avPlayer.pause() // 调用暂停播放接口
                } else {
                    this.avPlayer.seek(10000, media.SeekMode.SEEK_PREV_SYNC) // 前向seek置10秒处,触发seekDone回调函数
                }
                break;
            case 'paused': // pause成功调用后触发该状态机上报
                console.info(TAG + 'state paused called')
                if (this.count == 0) {
                    this.count++
                    this.avPlayer.play() // 继续调用播放接口开始播放
                }
                break;
            case 'completed': // 播放结束后触发该状态机上报
                console.info(TAG + 'state completed called')
                this.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(TAG + 'state stopped called')
                this.avPlayer.reset() // 调用reset接口初始化avplayer状态
                break;
            case 'released':
                console.info(TAG + 'state released called')
                break;
            case 'error':
                console.info(TAG + 'state error called')
                break;
            default:
                console.info(TAG + 'unkown state :' + state)
                break;
        }
    })

    // 创建avPlayer实例对象
    this.avPlayer = await media.createAVPlayer()
    let fdPath = 'fd://'
    let pathDir = "/data/storage/el2/base/haps/entry/files" // pathDir在FA模型和Stage模型的获取方式不同，请参考开发步骤首行的说明，根据实际情况自行获取。
    // path路径的码流可通过"hdc file send D:\xxx\H264_AAC.mp4 /data/app/el2/100/base/ohos.acts.multimedia.media.avplayer/haps/entry/files" 命令，将其推送到设备上
    let path = pathDir  + '/H264_AAC.mp4'
    let file = await fs.open(path)
    fdPath = fdPath + '' + file.fd
    //赋值url后就会进入stateChange callback
    this.avPlayer.url = fdPath
}

/**
     * Prepare audio/video playback, it will request resource for playing.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when prepare completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     * @throws { BusinessError } 5400106 - Unsupport format. Return by callback.
     */
    prepare(callback: AsyncCallback<void>): void;

    /**
     * Prepare audio/video playback, it will request resource for playing.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @returns A Promise instance used to return when prepare completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
     * @throws { BusinessError } 5400106 - Unsupport format. Return by promise.
     */
    prepare(): Promise<void>;

    /**
     * Play audio/video playback.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when play completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     */
    play(callback: AsyncCallback<void>): void;

    /**
     * Play audio/video playback.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @returns A Promise instance used to return when play completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
     */
    play(): Promise<void>;

    /**
     * Pause audio/video playback.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when pause completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     */
    pause(callback: AsyncCallback<void>): void;

    /**
     * Pause audio/video playback.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @returns A Promise instance used to return when pause completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
     */
    pause(): Promise<void>;

    /**
     * Stop audio/video playback.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when stop completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     */
    stop(callback: AsyncCallback<void>): void;

     /**
      * Stop audio/video playback.
      * @since 9
      * @syscap SystemCapability.Multimedia.Media.AVPlayer
      * @returns A Promise instance used to return when stop completed.
      * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
      */
    stop(): Promise<void>;

    /**
     * Reset AVPlayer, it will to idle state and can set src again.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when reset completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     */
    reset(callback: AsyncCallback<void>): void;

    /**
     * Reset AVPlayer, it will to idle state and can set src again.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @returns A Promise instance used to return when reset completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
     */
    reset(): Promise<void>;

    /**
     * Releases resources used for AVPlayer.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param callback A callback instance used to return when release completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by callback.
     */
    release(callback: AsyncCallback<void>): void;

    /**
     * Releases resources used for AVPlayer.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @returns A Promise instance used to return when release completed.
     * @throws { BusinessError } 5400102 - Operation not allowed. Return by promise.
     */
    release(): Promise<void>;

    /**
     * Jumps to the specified playback position.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param timeMs Playback position to jump, should be in [0, duration].
     * @param mode See @SeekMode .
     */
    seek(timeMs: number, mode?:SeekMode): void;

/**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback stateChange event.
     */
    on(type: 'stateChange', callback: (state: AVPlayerState, reason: StateChangeReason) => void): void;
    off(type: 'stateChange'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback volume event.
     */
    on(type: 'volumeChange', callback: Callback<number>): void;
    off(type: 'volumeChange'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback end of stream
     */
    on(type: 'endOfStream', callback: Callback<void>): void;
    off(type: 'endOfStream'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback seekDone event.
     */
    on(type: 'seekDone', callback: Callback<number>): void;
    off(type: 'seekDone'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback speedDone event.
     */
    on(type: 'speedDone', callback: Callback<number>): void;
    off(type: 'speedDone'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback setBitrateDone event.
     */
    on(type: 'bitrateDone', callback: Callback<number>): void;
    off(type: 'bitrateDone'): void;
    /**
     * LRegister or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback timeUpdate event.
     */
    on(type: 'timeUpdate', callback: Callback<number>): void;
    off(type: 'timeUpdate'): void;
    /**
     * Register or unregister listens for media playback events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback durationUpdate event.
     */
    on(type: 'durationUpdate', callback: Callback<number>): void;
    off(type: 'durationUpdate'): void;
    /**
     * Register or unregister listens for video playback buffering events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback buffering update event to listen for.
     * @param callback Callback used to listen for the buffering update event, return BufferingInfoType and the value.
     */
    on(type: 'bufferingUpdate', callback: (infoType: BufferingInfoType, value: number) => void): void;
    off(type: 'bufferingUpdate'): void;
    /**
     * Register or unregister listens for start render video frame events.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback event return .
     */
    on(type: 'startRenderFrame', callback: Callback<void>): void;
    off(type: 'startRenderFrame'): void;
    /**
     * Register or unregister listens for video size change event.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback event return video size.
     */
    on(type: 'videoSizeChange', callback: (width: number, height: number) => void): void;
    off(type: 'videoSizeChange'): void;
    /**
     * Register or unregister listens for audio interrupt event, refer to {@link #audio.InterruptEvent}
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback event return audio interrupt info.
     */
    on(type: 'audioInterrupt', callback: (info: audio.InterruptEvent) => void): void;
    off(type: 'audioInterrupt'): void;
    /**
     * Register or unregister listens for available bitrate list collect completed events for HLS protocol stream playback.
     * This event will be reported after the {@link #prepare} called.
     * @since 9
     * @syscap SystemCapability.Multimedia.Media.AVPlayer
     * @param type Type of the playback event to listen for.
     * @param callback Callback used to listen for the playback event return available bitrate list.
     */
    on(type: 'availableBitrates', callback: (bitrates: Array<number>) => void): void;
    off(type: 'availableBitrates'): void;

build() {
    Stack({ alignContent: Alignment.Center }) {
      if (this.isShowMenu) {
        Column() {
          //视频名称
          PlayTitle({ title: this.displayName, handleBack: this.handleBack })
          Row() {
            //播放控件
            PreVideo({ handleClick: this.handlePrevClick })
            PlayButton({ isPlaying: $isPlaying })
            NextVideo({ handleClick: this.handleNextClick })
          }
          .margin({ top: '40%' })

          Blank()
          //时间刻度
          Row() {
            Text(getTimeString(this.currentTime))
              .fontSize(25)
              .fontColor(Color.White)
            Blank()
            Text(this.fileAsset ? getTimeString(this.fileAsset.duration) : '00:00')
              .fontSize(25)
              .fontColor(Color.White)
          }
          .width('95%')
      //进度条
          Slider({ value: this.fileAsset ? this.currentTime / this.fileAsset.duration * 100 : 0 })
            .width('92%')
            .selectedColor(Color.White)
            .onChange((value: number) => {
              Logger.info(TAG, 'seek time change')
              this.currentTime = this.fileAsset.duration * value / 100
              this.videoPlayer.seek(this.currentTime)
            })
        }
        .height('100%')
        .zIndex(2)
      }
      Row() {
        XComponent({
          id: 'componentId',
          type: 'surface',
          controller: this.mxcomponentController
        })
          .onLoad(() => {
            Logger.info(TAG, 'onLoad is called')
            this.playVideo()
          })
          .width('100%')
          .aspectRatio(this.ratio)
      }
      .height('100%')
      .width('100%')
      .justifyContent(FlexAlign.Center)
    }
    .width('100%')
    .height('100%')
    .backgroundColor(Color.Black)
    .onClick(() => {
      this.isShowMenu = !this.isShowMenu
    })
  }

//根据视频文件获取视频源尺寸并生成surface
  //视频文件的路径在/storage/media/100/local/files/Videos
  async prepareVideo() {
    this.ratio = this.fileAsset.width / this.fileAsset.height
    this.mxcomponentController.setXComponentsurfaceSize({
      surfaceWidth: this.fileAsset.width,
      surfaceHeight: this.fileAsset.height
    })
    this.surfaceId = this.mxcomponentController.getXComponentsurfaceId()
    this.fd = await this.fileAsset.open('Rw')
    Logger.info(TAG, `fd://' ${this.fd} `)
    return 'fd://' + this.fd
  }
  //初始化视频文件并初始化avplayer
  async playVideo() {
    Logger.info(TAG, 'playVideo')
    try{
      await this.getMediaList()
      let fdPath = await this.prepareVideo()
      this.videoPlayer.on('timeUpdate', (time:number) => {
        console.info('timeUpdate success,and new time is :' + time)
        this.currentTime = time;
      })
      await this.videoPlayer.initVideoPlayer(fdPath, this.surfaceId)
      this.isPlaying = true
    }catch(error) {
      Logger.info(TAG, `playVideo error ${JSON.stringify(error)}`)
    }
  }