调整表面视图以改变android中视频显示的宽高比

Question

我正在从事视频会议项目。我的视频显示使用表面视图。现在，在视频通话期间，输入帧的宽高比可能会发生变化。所以我已经尝试了以下代码

public void surfaceResize() {

   // WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    Point size = new Point();
    int screenWidth = 0;
    //Get the SurfaceView layout parameters

    float aspectRatio = (float) recv_frame_width / recv_frame_height;

    if(getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) 
    {   
        //Get the width of the screen
        getWindowManager().getDefaultDisplay().getSize(size);
        screenWidth = size.x;

        //Set the width of the SurfaceView to the width of the screen
        surflp.width = screenWidth;

        //Set the height of the SurfaceView to match the aspect ratio of the video 
        //be sure to cast these as floats otherwise the calculation will likely be 0
        surflp.height = (int) ((1 / aspectRatio) * (float)screenWidth);

        //Commit the layout parameters

    } else {

        size.x = size.y = 0;
        //Get the width of the screen
        getWindowManager().getDefaultDisplay().getSize(size);

        int screenHeight = size.y;

        //Set the width of the SurfaceView to the width of the screen
        surflp.height = screenHeight;

        //Set the width of the SurfaceView to match the aspect ratio of the video 
        //be sure to cast these as floats otherwise the calculation will likely be 0
        surflp.width = (int) ( aspectRatio * (float)screenHeight);

        //Commit the layout parameters
        // code to do for Portrait Mode        
    }
    surflp.addRule(RelativeLayout.CENTER_HORIZONTAL);
    surflp.addRule(RelativeLayout.CENTER_VERTICAL);

    if(myVideoSurfaceView != null) 
        myVideoSurfaceView.setLayoutParams(surflp);  
    System.out.println("Surface resized*****************************************");
}

如果我在调用开始时调用此函数，一切都很好。我的问题是，当我在两次更改宽高比的调用之间调用此函数时，花费太多时间才能显示下一帧。有时视频甚至卡住了。

我试图用以下方法破坏并重建表面

myVideoSurface.setVisibility(VIEW.GONE);

但是没有创建表面。

我正在使用Mediacodec进行视频解码，当分辨率发生变化时，我会收到通知。

已经播放视频时，我还需要做些其他工作来调整SurfaceView的大小。

感谢您的帮助.........................

Answer 1

您好，尝试以下代码：

private void setVideoSize() {

            // // Get the dimensions of the video
            int videoWidth = mediaPlayer.getVideoWidth();
            int videoHeight = mediaPlayer.getVideoHeight();
            float videoProportion = (float) videoWidth / (float) videoHeight;

            // Get the width of the screen
            int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
            int screenHeight = getWindowManager().getDefaultDisplay().getHeight();
            float screenProportion = (float) screenWidth / (float) screenHeight;

            // Get the SurfaceView layout parameters
            android.view.ViewGroup.LayoutParams lp = surfaceView.getLayoutParams();
            if (videoProportion > screenProportion) {
                lp.width = screenWidth;
                lp.height = (int) ((float) screenWidth / videoProportion);
            } else {
                lp.width = (int) (videoProportion * (float) screenHeight);
                lp.height = screenHeight;
            }
            // Commit the layout parameters
            surfaceView.setLayoutParams(lp);
        }