在android中调整视频显示中纵横比变化的表面视图 [英] Resizing surface view for aspect ratio change in video display in android

问题描述

我正在做一个视频会议项目.我的视频显示正在使用表面视图.现在，在视频通话期间，传入帧的纵横比可能会发生变化.所以我尝试了以下代码

I am working on a video conferencing project. My video display is using surface view. Now during a video call there is a chance of aspect ratio change for the incoming frames. So i have tried the following code for it

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这个函数，一切都很好.我的问题是，当我在更改纵横比的调用之间调用此函数时，显示下一帧需要太多时间.有时视频甚至会卡住.

Everything is fine if I call this function at beginning of call. My problem is when I call this function in between a call for changing aspect ratio it takes too much time to display the next frame. Sometimes the video gets stuck even.

我试图破坏并重建表面

myVideoSurface.setVisibility(VIEW.GONE);

但是表面没有被创建.

我正在使用 Mediacodec 进行视频解码，我会在分辨率更改时收到通知.

I am using Mediacodec for video decode I will get notified when there is a resolution change.

当已经播放视频时，我还需要做些什么来调整surfaceView的大小.

Is there something more I should do for resizing a surfaceView when already video is being played.

感谢您的帮助......................................

Thanks for help.........................

推荐答案

你好试试下面的代码:

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);
        }

这篇关于在android中调整视频显示中纵横比变化的表面视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！