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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media.videoeditor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
/**
* This class allows to render an "alpha blending" transition according to a
* bitmap mask. The mask shows the shape of the transition all along the
* duration of the transition: just before the transition, video 1 is fully
* displayed. When the transition starts, as the time goes on, pixels of video 2
* replace pixels of video 1 according to the gray scale pixel value of the
* mask.
* {@hide}
*/
public class TransitionAlpha extends Transition {
/** This is the input JPEG file for the mask */
private final String mMaskFilename;
/**
* This is percentage (between 0 and 100) of blending between video 1 and
* video 2 if this value equals 0, then the mask is strictly applied if this
* value equals 100, then the mask is not at all applied (no transition
* effect)
*/
private final int mBlendingPercent;
/**
* If true, this value inverts the direction of the mask: white pixels of
* the mask show video 2 pixels first black pixels of the mask show video 2
* pixels last.
*/
private final boolean mIsInvert;
private int mWidth;
private int mHeight;
private String mRGBMaskFile;
/**
* An object of this type cannot be instantiated by using the default
* constructor
*/
@SuppressWarnings("unused")
private TransitionAlpha() {
this(null, null, null, 0, 0, null, 0, false);
}
/**
* Constructor
*
* @param transitionId The transition id
* @param afterMediaItem The transition is applied to the end of this media
* item
* @param beforeMediaItem The transition is applied to the beginning of this
* media item
* @param durationMs duration of the transition in milliseconds
* @param behavior behavior is one of the behavior defined in Transition
* class
* @param maskFilename JPEG file name. The dimension of the image
* corresponds to 720p (16:9 aspect ratio). Mask files are
* shared between video editors and can be created in the
* projects folder (the parent folder for all projects).
* @param blendingPercent The blending percent applied
* @param invert true to invert the direction of the alpha blending
* @throws IllegalArgumentException if behavior is not supported, or if
* direction are not supported.
*/
public TransitionAlpha(String transitionId, MediaItem afterMediaItem,
MediaItem beforeMediaItem, long durationMs, int behavior,
String maskFilename, int blendingPercent, boolean invert) {
super(transitionId, afterMediaItem, beforeMediaItem, durationMs, behavior);
/**
* Generate a RGB file for the supplied mask file
*/
final BitmapFactory.Options dbo = new BitmapFactory.Options();
dbo.inJustDecodeBounds = true;
if (!new File(maskFilename).exists())
throw new IllegalArgumentException("File not Found " + maskFilename);
BitmapFactory.decodeFile(maskFilename, dbo);
mWidth = dbo.outWidth;
mHeight = dbo.outHeight;
if (afterMediaItem != null) {
mNativeHelper = afterMediaItem.getNativeContext();
}else {
mNativeHelper = beforeMediaItem.getNativeContext();
}
mRGBMaskFile = String.format(mNativeHelper.getProjectPath() +
"/" + "mask" + transitionId+ ".rgb");
FileOutputStream fl = null;
try{
fl = new FileOutputStream(mRGBMaskFile);
} catch (IOException e) {
/* catch IO exception */
}
final DataOutputStream dos = new DataOutputStream(fl);
if (fl != null) {
/**
* Write to rgb file
*/
Bitmap imageBitmap = BitmapFactory.decodeFile(maskFilename);
final int [] framingBuffer = new int[mWidth];
ByteBuffer byteBuffer = ByteBuffer.allocate(framingBuffer.length * 4);
IntBuffer intBuffer;
byte[] array = byteBuffer.array();
int tmp = 0;
while (tmp < mHeight) {
imageBitmap.getPixels(framingBuffer, 0, mWidth, 0, tmp,mWidth, 1);
intBuffer = byteBuffer.asIntBuffer();
intBuffer.put(framingBuffer,0,mWidth);
try {
dos.write(array);
} catch (IOException e) {
/* catch file write error */
}
tmp += 1;
}
imageBitmap.recycle();
try{
fl.close();
}catch (IOException e) {
/* file close error */
}
}
/**
* Capture the details
*/
mMaskFilename = maskFilename;
mBlendingPercent = blendingPercent;
mIsInvert = invert;
}
public int getRGBFileWidth() {
return mWidth;
}
public int getRGBFileHeight() {
return mHeight;
}
public String getPNGMaskFilename() {
return mRGBMaskFile;
}
/**
* Get the blending percentage
*
* @return The blending percentage
*/
public int getBlendingPercent() {
return mBlendingPercent;
}
/**
* Get the filename of the mask.
*
* @return The mask filename
*/
public String getMaskFilename() {
return mMaskFilename;
}
/**
* Check if the alpha blending direction is inverted.
*
* @return true if the direction of the alpha blending is inverted
*/
public boolean isInvert() {
return mIsInvert;
}
/*
* {@inheritDoc}
*/
@Override
public void generate() {
super.generate();
}
}
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