How UniApp implements camera and video calls

UniApp is a cross-platform development framework developed based on HBuilder, which can enable one code to run on multiple platforms. This article will introduce how to implement camera and video call functions in UniApp, and give corresponding code examples.

1. Obtain the user's camera permission

In UniApp, we need to first obtain the user's camera permission. In the mounted life cycle function of the page, use uni's authorize method to call the camera permission. The code example is as follows:

mounted() {
  uni.authorize({
    scope: 'scope.camera',
    success() {
      console.log('获取摄像头权限成功');
    },
    fail(err) {
      console.log('获取摄像头权限失败', err);
    }
  });
}

2. Open the camera and display the preview

After obtaining the user's camera permission, we can use uni's createCameraContext method to create a CameraContext object. Then call its startPreview method to turn on the camera and display the preview on the page. The code example is as follows:

data() {
  return {
    cameraContext: null, // 摄像头对象
  };
},
mounted() {
  this.cameraContext = uni.createCameraContext();
  this.cameraContext.startPreview();
}

In the page, we can use the uni-camera component to display the preview screen. The code example is as follows:

<template>
  <view>
    <uni-camera :camera-context="cameraContext"></uni-camera>
  </view>
</template>

3. Implement video call

To implement the video call function, we can use uni’s createLivePusherContext and createLivePlayerContext methods Create LivePusherContext and LivePlayerContext objects, through which push and playback can be performed. On the streaming side, we need to call the start method to start streaming; on the playing side, we need to call the play method to start playing. The code example is as follows:

data() {
  return {
    livePusherContext: null, // 推流对象
    livePlayerContext: null, // 播放对象
  };
},
mounted() {
  this.livePusherContext = uni.createLivePusherContext();
  this.livePlayerContext = uni.createLivePlayerContext();

  // 开始推流
  this.livePusherContext.start();

  // 开始播放
  this.livePlayerContext.play();
}

In the page, we can use the uni-live-push component to display the push screen and the uni-live-player component to display the playback picture. The code example is as follows:

<template>
  <view>
    <uni-live-push :live-pusher-context="livePusherContext"></uni-live-push>
    <uni-live-player :live-player-context="livePlayerContext"></uni-live-player>
  </view>
</template>

4. Ending the video call

If we want to end the video call, we can call the corresponding method to stop the push and playback. On the streaming side, call the stop method to stop pushing; on the playing side, call the stop method to stop playing. The code example is as follows:

// 结束推流
this.livePusherContext.stop();

// 结束播放
this.livePlayerContext.stop();

Through the above method, we can implement the camera and video call functions in UniApp. I hope this article will be helpful to your UniApp development!

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