HarmonyOS系统AVPlayer视频播放功能开发指南

HarmonyOS的AVPlayer提供了强大的多媒体播放能力，支持多种视频格式和网络协议。以下是利用AVPlayer开发视频播放功能的完整实现方案。

一、基础环境配置

1. 添加权限

在config.json中添加必要权限：

{
  "module": {
    "reqPermissions": [
      {
        "name": "ohos.permission.INTERNET"  // 网络视频需要
      },
      {
        "name": "ohos.permission.READ_MEDIA"  // 本地视频需要
      }
    ]
  }
}

2. 导入AVPlayer模块

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

二、创建AVPlayer实例

1. 初始化AVPlayer

let avPlayer: media.AVPlayer;
let surfaceId: string; // 用于视频渲染的surface ID

async function initAVPlayer() {
  // 创建AVPlayer实例
  avPlayer = await media.createAVPlayer();

  // 设置监听器
  avPlayer.on('stateChange', (state: string) => {
    console.log(`Current state: ${state}`);
    // 可处理的状态：idle, initialized, prepared, playing, paused, completed, stopped, released, error
  });

  avPlayer.on('error', (error: BusinessError) => {
    console.error(`Error occurred: ${error.code}, ${error.message}`);
  });
}

三、视频播放实现

1. 播放网络视频

async function playNetworkVideo(url: string) {
  // 设置播放源
  await avPlayer.reset();
  await avPlayer.setSource({
    uri: url  // 支持http/https/rtmp等协议
  });

  // 准备播放
  await avPlayer.prepare();

  // 获取surface并绑定到UI组件
  surfaceId = await avPlayer.getSurfaceId();
  // 将surfaceId传递给XComponent组件

  // 开始播放
  await avPlayer.play();
}

2. 播放本地视频

async function playLocalVideo(filePath: string) {
  // 检查文件是否存在
  try {
    await fs.access(filePath);
  } catch (error) {
    console.error('File not found');
    return;
  }

  // 设置播放源
  await avPlayer.reset();
  await avPlayer.setSource({
    fdSrc: {
      fd: await fs.open(filePath).fd,
      offset: 0,
      length: (await fs.stat(filePath)).size
    }
  });

  await avPlayer.prepare();
  surfaceId = await avPlayer.getSurfaceId();
  await avPlayer.play();
}

四、播放控制功能

1. 基础控制方法

// 暂停播放
function pause() {
  avPlayer.pause();
}

// 继续播放
function resume() {
  avPlayer.play();
}

// 停止播放
function stop() {
  avPlayer.stop();
}

// 跳转到指定位置(毫秒)
function seekTo(position: number) {
  avPlayer.seek(position, media.SeekMode.SEEK_NEXT_SYNC);
}

// 调整播放速度
function setSpeed(speed: media.PlaybackSpeed) {
  avPlayer.setSpeed(speed);  // 如PlaybackSpeed.SPEED_FORWARD_1_00_X
}

2. 获取播放信息

async function getPlayerInfo() {
  const currentPos = await avPlayer.getCurrentTime();  // 当前播放位置(ms)
  const duration = await avPlayer.getDuration();      // 总时长(ms)
  const videoWidth = avPlayer.getVideoWidth();       // 视频宽度
  const videoHeight = avPlayer.getVideoHeight();     // 视频高度
  const isPlaying = avPlayer.state === 'playing';    // 是否正在播放

  return { currentPos, duration, videoWidth, videoHeight, isPlaying };
}

五、UI界面集成

1. 布局文件示例

<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:width="match_parent"
    ohos:height="match_parent"
    ohos:orientation="vertical">

    <!-- 视频显示区域 -->
    <XComponent
        ohos:id="$+id:videoComponent"
        ohos:width="match_parent"
        ohos:height="300vp"
        ohos:type="surface"/>

    <!-- 控制按钮区域 -->
    <DirectionalLayout
        ohos:width="match_parent"
        ohos:height="wrap_content"
        ohos:orientation="horizontal"
        ohos:margin_top="10vp">

        <Button
            ohos:id="$+id:playBtn"
            ohos:width="100vp"
            ohos:height="50vp"
            ohos:text="播放"/>

        <Button
            ohos:id="$+id:pauseBtn"
            ohos:width="100vp"
            ohos:height="50vp"
            ohos:text="暂停"/>

        <Slider
            ohos:id="$+id:progressSlider"
            ohos:width="200vp"
            ohos:height="50vp"/>
    </DirectionalLayout>
</DirectionalLayout>

2. 界面逻辑实现

import { XComponent } from '@ohos.arkui.xcomponent';

@Entry
@Component
struct VideoPlayerPage {
  private avPlayer: media.AVPlayer = null;

  build() {
    Column() {
      // 视频显示区域
      XComponent({
        id: 'videoComponent',
        type: 'surface',
        controller: this.xComponentController
      })
      .onLoad(() => {
        // 绑定surface到AVPlayer
        this.bindSurface();
      })

      // 控制区域
      Row() {
        Button('播放')
          .onClick(() => this.playVideo())

        Button('暂停')
          .onClick(() => this.pauseVideo())

        Slider({
          value: 0,
          min: 0,
          max: 100
        })
        .onChange((value: number) => {
          this.seekTo(value);
        })
      }
    }
  }

  async bindSurface() {
    // 获取XComponent的surface
    this.surfaceId = await this.xComponentController.getXComponentSurfaceId();

    // 将surface设置给AVPlayer
    if (this.avPlayer) {
      this.avPlayer.setDisplaySurface(this.surfaceId);
    }
  }

  async playVideo() {
    if (!this.avPlayer) {
      await this.initAVPlayer();
    }
    await this.avPlayer.play();
  }

  // 其他方法实现...
}

六、高级功能实现

1. 全屏播放实现

function toggleFullscreen(isFullscreen: boolean) {
  // 获取窗口能力
  const windowClass = getContext(this).resourceManager;
  const window = windowClass.getTopWindow();

  if (window) {
    if (isFullscreen) {
      window.setWindowLayoutFullScreen(true);
      // 调整XComponent大小
      this.videoComponent.width = '100%';
      this.videoComponent.height = '100%';
    } else {
      window.setWindowLayoutFullScreen(false);
      this.videoComponent.width = 'match_parent';
      this.videoComponent.height = '300vp';
    }
  }
}

2. 视频缓存设置

async function setCacheConfig() {
  const cacheConfig: media.AVPlayerCacheConfig = {
    enable: true,           // 启用缓存
    maxCacheSize: 200,      // 最大缓存大小(MB)
    maxCacheFileSize: 50,   // 单个缓存文件最大大小(MB)
    cachePath: getContext().cacheDir + '/videoCache'  // 缓存路径
  };

  await avPlayer.setCacheConfig(cacheConfig);
}

七、资源释放

1. 正确释放资源

function releasePlayer() {
  if (avPlayer) {
    avPlayer.stop();
    avPlayer.release();
    avPlayer = null;
  }
}

// 在页面销毁时调用
aboutToDisappear() {
  this.releasePlayer();
}