// *
// * Sets the TextureView transform to preserve the aspect ratio of the video.
//
private void AdjustAspectRatio(int videoWidth, int videoHeight)
{
int viewWidth = mTextureView.Width;
int viewHeight = mTextureView.Height;
double aspectRatio = (double)videoHeight / videoWidth;
int newWidth, newHeight;
if (viewHeight > (int)(viewWidth * aspectRatio))
{
// limited by narrow width; restrict height
newWidth = viewWidth;
newHeight = (int)(viewWidth * aspectRatio);
}
else
{
// limited by short height; restrict width
newWidth = (int)(viewHeight / aspectRatio);
newHeight = viewHeight;
}
int xoff = (viewWidth - newWidth) / 2;
int yoff = (viewHeight - newHeight) / 2;
Log.Verbose(TAG, "video=" + videoWidth + "x" + videoHeight + " view=" + viewWidth + "x" + viewHeight + " newView=" + newWidth + "x" + newHeight + " off=" + xoff + "," + yoff);
Matrix txform = new Matrix();
mTextureView.GetTransform(txform);
txform.SetScale((float)newWidth / viewWidth, (float)newHeight / viewHeight);
//txform.postRotate(10); // just for fun
txform.PostTranslate(xoff, yoff);
mTextureView.SetTransform(txform);
}