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/*
* Copyright (C) 2015 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.messaging.util;
import android.content.Context;
import android.text.format.Formatter;
import com.google.common.base.Stopwatch;
import java.io.File;
import java.util.concurrent.TimeUnit;
/**
* Compresses a GIF so it can be sent via MMS.
* <p>
* The entry point lives in its own class, we can defer loading the native GIF transcoding library
* into memory until we actually need it.
*/
public class GifTranscoder {
private static final String TAG = LogUtil.BUGLE_TAG;
private static int MIN_HEIGHT = 100;
private static int MIN_WIDTH = 100;
static {
System.loadLibrary("giftranscode");
}
public static boolean transcode(Context context, String filePath, String outFilePath) {
if (!isEnabled()) {
return false;
}
final long inputSize = new File(filePath).length();
Stopwatch stopwatch = Stopwatch.createStarted();
final boolean success = transcodeInternal(filePath, outFilePath);
stopwatch.stop();
final long elapsedMs = stopwatch.elapsed(TimeUnit.MILLISECONDS);
final long outputSize = new File(outFilePath).length();
final float compression = (inputSize > 0) ? ((float) outputSize / inputSize) : 0;
if (success) {
LogUtil.i(TAG, String.format("Resized GIF (%s) in %d ms, %s => %s (%.0f%%)",
LogUtil.sanitizePII(filePath),
elapsedMs,
Formatter.formatShortFileSize(context, inputSize),
Formatter.formatShortFileSize(context, outputSize),
compression * 100.0f));
}
return success;
}
private static native boolean transcodeInternal(String filePath, String outFilePath);
/**
* Estimates the size of a GIF transcoded from a GIF with the specified size.
*/
public static long estimateFileSizeAfterTranscode(long fileSize) {
// I tested transcoding on ~70 GIFs and found that the transcoded files are in general
// about 25-35% the size of the original. This compression ratio is very consistent for the
// class of GIFs we care about most: those converted from video clips and 1-3 MB in size.
return (long) (fileSize * 0.35f);
}
public static boolean canBeTranscoded(int width, int height) {
if (!isEnabled()) {
return false;
}
return width >= MIN_WIDTH && height >= MIN_HEIGHT;
}
private static boolean isEnabled() {
final boolean enabled = BugleGservices.get().getBoolean(
BugleGservicesKeys.ENABLE_GIF_TRANSCODING,
BugleGservicesKeys.ENABLE_GIF_TRANSCODING_DEFAULT);
if (!enabled) {
LogUtil.w(TAG, "GIF transcoding is disabled");
}
return enabled;
}
}
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