1 /* 2 * Copyright (C) 2014 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 com.android.camera.data; 18 19 import android.graphics.Bitmap; 20 import android.graphics.BitmapFactory; 21 import android.graphics.Matrix; 22 import android.graphics.Point; 23 import android.media.MediaMetadataRetriever; 24 25 import com.android.camera.debug.Log; 26 27 import java.io.InputStream; 28 29 import javax.microedition.khronos.opengles.GL11; 30 31 /** 32 * An utility class for data in content provider. 33 */ 34 public class FilmstripItemUtils { 35 36 private static final Log.Tag TAG = new Log.Tag("LocalDataUtil"); 37 38 /** 39 * @param mimeType The MIME type to check. 40 * @return Whether the MIME is a video type. 41 */ isMimeTypeVideo(String mimeType)42 public static boolean isMimeTypeVideo(String mimeType) { 43 return mimeType != null && mimeType.startsWith("video/"); 44 } 45 46 /** 47 * Checks whether the MIME type represents an image media item. 48 * 49 * @param mimeType The MIME type to check. 50 * @return Whether the MIME is a image type. 51 */ isMimeTypeImage(String mimeType)52 public static boolean isMimeTypeImage(String mimeType) { 53 return mimeType != null && mimeType.startsWith("image/"); 54 } 55 56 57 /** 58 * Decodes the dimension of a bitmap. 59 * 60 * @param is An input stream with the data of the bitmap. 61 * @return The decoded width/height is stored in Point.x/Point.y 62 * respectively. 63 */ decodeBitmapDimension(InputStream is)64 public static Point decodeBitmapDimension(InputStream is) { 65 Point size = null; 66 BitmapFactory.Options justBoundsOpts = new BitmapFactory.Options(); 67 justBoundsOpts.inJustDecodeBounds = true; 68 BitmapFactory.decodeStream(is, null, justBoundsOpts); 69 if (justBoundsOpts.outWidth > 0 && justBoundsOpts.outHeight > 0) { 70 size = new Point(justBoundsOpts.outWidth, justBoundsOpts.outHeight); 71 } else { 72 Log.e(TAG, "Bitmap dimension decoding failed"); 73 } 74 return size; 75 } 76 77 /** 78 * Load the thumbnail of an image from an {@link java.io.InputStream}. 79 * 80 * @param stream The input stream of the image. 81 * @param imageWidth Image width. 82 * @param imageHeight Image height. 83 * @param widthBound The bound of the width of the decoded image. 84 * @param heightBound The bound of the height of the decoded image. 85 * @param orientation The orientation of the image. The image will be rotated 86 * clockwise in degrees. 87 * @param maximumPixels The bound for the number of pixels of the decoded image. 88 * @return {@code null} if the decoding failed. 89 */ loadImageThumbnailFromStream(InputStream stream, int imageWidth, int imageHeight, int widthBound, int heightBound, int orientation, int maximumPixels)90 public static Bitmap loadImageThumbnailFromStream(InputStream stream, int imageWidth, 91 int imageHeight, int widthBound, int heightBound, int orientation, 92 int maximumPixels) { 93 94 /** 32K buffer. */ 95 byte[] decodeBuffer = new byte[32 * 1024]; 96 97 if (orientation % 180 != 0) { 98 int dummy = imageHeight; 99 imageHeight = imageWidth; 100 imageWidth = dummy; 101 } 102 103 // Generate Bitmap of maximum size that fits into widthBound x heightBound. 104 // Algorithm: start with full size and step down in powers of 2. 105 int targetWidth = imageWidth; 106 int targetHeight = imageHeight; 107 int sampleSize = 1; 108 while (targetHeight > heightBound || targetWidth > widthBound || 109 targetHeight > GL11.GL_MAX_TEXTURE_SIZE || targetWidth > GL11.GL_MAX_TEXTURE_SIZE || 110 targetHeight * targetWidth > maximumPixels) { 111 sampleSize <<= 1; 112 targetWidth = imageWidth / sampleSize; 113 targetHeight = imageWidth / sampleSize; 114 } 115 116 // For large (> MAXIMUM_TEXTURE_SIZE) high aspect ratio (panorama) 117 // Bitmap requests: 118 // Step 1: ask for double size. 119 // Step 2: scale maximum edge down to MAXIMUM_TEXTURE_SIZE. 120 // 121 // Here's the step 1: double size. 122 if ((heightBound > GL11.GL_MAX_TEXTURE_SIZE || widthBound > GL11.GL_MAX_TEXTURE_SIZE) && 123 targetWidth * targetHeight < maximumPixels / 4 && sampleSize > 1) { 124 sampleSize >>= 2; 125 } 126 127 BitmapFactory.Options opts = new BitmapFactory.Options(); 128 opts.inSampleSize = sampleSize; 129 opts.inTempStorage = decodeBuffer; 130 Bitmap b = BitmapFactory.decodeStream(stream, null, opts); 131 132 if (b == null) { 133 return null; 134 } 135 136 // Step 2: scale maximum edge down to maximum texture size. 137 // If Bitmap maximum edge > MAXIMUM_TEXTURE_SIZE, which can happen for panoramas, 138 // scale to fit in MAXIMUM_TEXTURE_SIZE. 139 if (b.getWidth() > GL11.GL_MAX_TEXTURE_SIZE || b.getHeight() > 140 GL11.GL_MAX_TEXTURE_SIZE) { 141 int maxEdge = Math.max(b.getWidth(), b.getHeight()); 142 b = Bitmap.createScaledBitmap(b, b.getWidth() * GL11.GL_MAX_TEXTURE_SIZE / maxEdge, 143 b.getHeight() * GL11.GL_MAX_TEXTURE_SIZE / maxEdge, false); 144 } 145 146 // Not called often because most modes save image data non-rotated. 147 if (orientation != 0 && b != null) { 148 Matrix m = new Matrix(); 149 m.setRotate(orientation); 150 b = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, false); 151 } 152 153 return b; 154 } 155 156 /** 157 * Loads the thumbnail of a video. 158 * 159 * @param path The path to the video file. 160 * @return {@code null} if the loading failed. 161 */ loadVideoThumbnail(String path)162 public static Bitmap loadVideoThumbnail(String path) { 163 Bitmap bitmap = null; 164 MediaMetadataRetriever retriever = new MediaMetadataRetriever(); 165 try { 166 retriever.setDataSource(path); 167 byte[] data = retriever.getEmbeddedPicture(); 168 if (data != null) { 169 bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 170 } 171 if (bitmap == null) { 172 bitmap = retriever.getFrameAtTime(); 173 } 174 } catch (IllegalArgumentException e) { 175 Log.e(TAG, "MediaMetadataRetriever.setDataSource() fail:" + e.getMessage()); 176 } 177 retriever.release(); 178 return bitmap; 179 } 180 } 181