1/*
2 * Copyright (C) 2011 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
17package com.android.camera;
18
19import android.graphics.Bitmap;
20import android.media.MediaMetadataRetriever;
21
22import java.io.FileDescriptor;
23
24public class Thumbnail {
25    public static Bitmap createVideoThumbnailBitmap(FileDescriptor fd, int targetWidth) {
26        return createVideoThumbnailBitmap(null, fd, targetWidth);
27    }
28
29    public static Bitmap createVideoThumbnailBitmap(String filePath, int targetWidth) {
30        return createVideoThumbnailBitmap(filePath, null, targetWidth);
31    }
32
33    private static Bitmap createVideoThumbnailBitmap(String filePath, FileDescriptor fd,
34            int targetWidth) {
35        Bitmap bitmap = null;
36        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
37        try {
38            if (filePath != null) {
39                retriever.setDataSource(filePath);
40            } else {
41                retriever.setDataSource(fd);
42            }
43            bitmap = retriever.getFrameAtTime(-1);
44        } catch (IllegalArgumentException ex) {
45            // Assume this is a corrupt video file
46        } catch (RuntimeException ex) {
47            // Assume this is a corrupt video file.
48        } finally {
49            try {
50                retriever.release();
51            } catch (RuntimeException ex) {
52                // Ignore failures while cleaning up.
53            }
54        }
55        if (bitmap == null) return null;
56
57        // Scale down the bitmap if it is bigger than we need.
58        int width = bitmap.getWidth();
59        int height = bitmap.getHeight();
60        if (width > targetWidth) {
61            float scale = (float) targetWidth / width;
62            int w = Math.round(scale * width);
63            int h = Math.round(scale * height);
64            bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
65        }
66        return bitmap;
67    }
68}
69