src/com/android/camera/Thumbnail.java

/*
 * Copyright (C) 2011 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 com.android.camera;

import android.graphics.Bitmap;
import android.media.MediaMetadataRetriever;

import java.io.FileDescriptor;

public class Thumbnail {
    public static Bitmap createVideoThumbnailBitmap(FileDescriptor fd, int targetWidth) {
        return createVideoThumbnailBitmap(null, fd, targetWidth);
    }

    public static Bitmap createVideoThumbnailBitmap(String filePath, int targetWidth) {
        return createVideoThumbnailBitmap(filePath, null, targetWidth);
    }

    private static Bitmap createVideoThumbnailBitmap(String filePath, FileDescriptor fd,
            int targetWidth) {
        Bitmap bitmap = null;
        MediaMetadataRetriever retriever = new MediaMetadataRetriever();
        try {
            if (filePath != null) {
                retriever.setDataSource(filePath);
            } else {
                retriever.setDataSource(fd);
            }
            bitmap = retriever.getFrameAtTime(-1);
        } catch (IllegalArgumentException ex) {
            // Assume this is a corrupt video file
        } catch (RuntimeException ex) {
            // Assume this is a corrupt video file.
        } finally {
            try {
                retriever.release();
            } catch (RuntimeException ex) {
                // Ignore failures while cleaning up.
            }
        }
        if (bitmap == null) return null;

        // Scale down the bitmap if it is bigger than we need.
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        if (width > targetWidth) {
            float scale = (float) targetWidth / width;
            int w = Math.round(scale * width);
            int h = Math.round(scale * height);
            bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
        }
        return bitmap;
    }
}