1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.media.videoeditor; 18 19 import android.graphics.Bitmap; 20 import android.graphics.BitmapFactory; 21 import java.io.DataOutputStream; 22 import java.io.File; 23 import java.io.FileOutputStream; 24 import java.io.IOException; 25 import java.nio.ByteBuffer; 26 import java.nio.IntBuffer; 27 28 /** 29 * This class allows to render an "alpha blending" transition according to a 30 * bitmap mask. The mask shows the shape of the transition all along the 31 * duration of the transition: just before the transition, video 1 is fully 32 * displayed. When the transition starts, as the time goes on, pixels of video 2 33 * replace pixels of video 1 according to the gray scale pixel value of the 34 * mask. 35 * {@hide} 36 */ 37 public class TransitionAlpha extends Transition { 38 /** This is the input JPEG file for the mask */ 39 private final String mMaskFilename; 40 41 /** 42 * This is percentage (between 0 and 100) of blending between video 1 and 43 * video 2 if this value equals 0, then the mask is strictly applied if this 44 * value equals 100, then the mask is not at all applied (no transition 45 * effect) 46 */ 47 private final int mBlendingPercent; 48 49 /** 50 * If true, this value inverts the direction of the mask: white pixels of 51 * the mask show video 2 pixels first black pixels of the mask show video 2 52 * pixels last. 53 */ 54 private final boolean mIsInvert; 55 56 57 private int mWidth; 58 private int mHeight; 59 private String mRGBMaskFile; 60 61 /** 62 * An object of this type cannot be instantiated by using the default 63 * constructor 64 */ 65 @SuppressWarnings("unused") 66 private TransitionAlpha() { 67 this(null, null, null, 0, 0, null, 0, false); 68 } 69 70 /** 71 * Constructor 72 * 73 * @param transitionId The transition id 74 * @param afterMediaItem The transition is applied to the end of this media 75 * item 76 * @param beforeMediaItem The transition is applied to the beginning of this 77 * media item 78 * @param durationMs duration of the transition in milliseconds 79 * @param behavior behavior is one of the behavior defined in Transition 80 * class 81 * @param maskFilename JPEG file name. The dimension of the image 82 * corresponds to 720p (16:9 aspect ratio). Mask files are 83 * shared between video editors and can be created in the 84 * projects folder (the parent folder for all projects). 85 * @param blendingPercent The blending percent applied 86 * @param invert true to invert the direction of the alpha blending 87 * @throws IllegalArgumentException if behavior is not supported, or if 88 * direction are not supported. 89 */ 90 public TransitionAlpha(String transitionId, MediaItem afterMediaItem, 91 MediaItem beforeMediaItem, long durationMs, int behavior, 92 String maskFilename, int blendingPercent, boolean invert) { 93 super(transitionId, afterMediaItem, beforeMediaItem, durationMs, behavior); 94 95 /** 96 * Generate a RGB file for the supplied mask file 97 */ 98 final BitmapFactory.Options dbo = new BitmapFactory.Options(); 99 dbo.inJustDecodeBounds = true; 100 if (!new File(maskFilename).exists()) 101 throw new IllegalArgumentException("File not Found " + maskFilename); 102 BitmapFactory.decodeFile(maskFilename, dbo); 103 104 mWidth = dbo.outWidth; 105 mHeight = dbo.outHeight; 106 107 mRGBMaskFile = String.format(mNativeHelper.getProjectPath() + 108 "/" + "mask" + transitionId+ ".rgb"); 109 110 111 FileOutputStream fl = null; 112 113 try{ 114 fl = new FileOutputStream(mRGBMaskFile); 115 } catch (IOException e) { 116 /* catch IO exception */ 117 } 118 final DataOutputStream dos = new DataOutputStream(fl); 119 120 if (fl != null) { 121 /** 122 * Write to rgb file 123 */ 124 Bitmap imageBitmap = BitmapFactory.decodeFile(maskFilename); 125 final int [] framingBuffer = new int[mWidth]; 126 ByteBuffer byteBuffer = ByteBuffer.allocate(framingBuffer.length * 4); 127 IntBuffer intBuffer; 128 129 byte[] array = byteBuffer.array(); 130 int tmp = 0; 131 while (tmp < mHeight) { 132 imageBitmap.getPixels(framingBuffer, 0, mWidth, 0, tmp,mWidth, 1); 133 intBuffer = byteBuffer.asIntBuffer(); 134 intBuffer.put(framingBuffer,0,mWidth); 135 try { 136 dos.write(array); 137 } catch (IOException e) { 138 /* catch file write error */ 139 } 140 tmp += 1; 141 } 142 143 imageBitmap.recycle(); 144 try{ 145 fl.close(); 146 }catch (IOException e) { 147 /* file close error */ 148 } 149 } 150 151 /** 152 * Capture the details 153 */ 154 mMaskFilename = maskFilename; 155 mBlendingPercent = blendingPercent; 156 mIsInvert = invert; 157 } 158 159 public int getRGBFileWidth() { 160 return mWidth; 161 } 162 163 public int getRGBFileHeight() { 164 return mHeight; 165 } 166 167 public String getPNGMaskFilename() { 168 return mRGBMaskFile; 169 } 170 171 /** 172 * Get the blending percentage 173 * 174 * @return The blending percentage 175 */ 176 public int getBlendingPercent() { 177 return mBlendingPercent; 178 } 179 180 /** 181 * Get the filename of the mask. 182 * 183 * @return The mask filename 184 */ 185 public String getMaskFilename() { 186 return mMaskFilename; 187 } 188 189 /** 190 * Check if the alpha blending direction is inverted. 191 * 192 * @return true if the direction of the alpha blending is inverted 193 */ 194 public boolean isInvert() { 195 return mIsInvert; 196 } 197 198 /* 199 * {@inheritDoc} 200 */ 201 @Override 202 public void generate() { 203 super.generate(); 204 } 205 } 206
