Resizing surface view for aspect ratio change in video display in android

36,720

Solution 1

Hello try with below code:

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);
        }

Solution 2

This problem can be solved like this.

36,720

Kevin K

Automotive Cyber Security

Updated on July 09, 2022

Comments

Kevin K over 1 year

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*****************************************");
}

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.

I tried to destroy and recreate the surface with

myVideoSurface.setVisibility(VIEW.GONE);

But the surface is not getting created.

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

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

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

Kevin K almost 10 years

Thanks kyogs for the fast response. But I too do something similar recv_frame_width and recv_frame_height are the current frame height and width. I want to know if there is something else to be done with the surfaceView for this change since the video is being played already.
kyogs almost 10 years

from surface view you can get video height and width.
Kevin K almost 10 years

@ kyogs Ya I know that but without that also I have the new width and height and the aspect ratio. but the problem comes when I try to resize my surfaceView, which takes too much time for it and sometimes the video gets stuck.
Kevin K almost 10 years

myVideoSurfaceView.setLayoutParams(surflp); This line is throwing some exception also...
Kevin K almost 10 years

@fadden can i have a help
Kevin K almost 10 years

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. This is the exception that i get
fadden almost 10 years

You have to make calls that modify the View from the UI thread. You can use a Handler to "forward" the call. See e.g. developer.android.com/training/multiple-threads/… .
Kevin K almost 10 years

Thank you fadden for the accurate solution
meunicorn about 7 years

You save my day ！
Erum over 6 years

@Fustigador pls share how u resolved screen aspect ratio
John Glen over 2 years

Doesn't work on my Android 9 device. Works on Android 6...