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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.usbtuner.exoplayer.cache;
import android.content.Context;
import android.media.MediaFormat;
import android.provider.Settings;
import android.util.Pair;
import java.io.File;
import java.util.ArrayList;
import java.util.SortedMap;
/**
* Manages Trickplay storage.
*/
public class TrickplayStorageManager implements CacheManager.StorageManager {
private static final String CACHE_DIR = "timeshift";
// Copied from android.provider.Settings.Global (hidden fields)
private static final String
SYS_STORAGE_THRESHOLD_PERCENTAGE = "sys_storage_threshold_percentage";
private static final String
SYS_STORAGE_THRESHOLD_MAX_BYTES = "sys_storage_threshold_max_bytes";
// Copied from android.os.StorageManager
private static final int DEFAULT_THRESHOLD_PERCENTAGE = 10;
private static final long DEFAULT_THRESHOLD_MAX_BYTES = 500L * 1024 * 1024;
private final File mCacheDir;
private final long mMaxCacheSize;
private final long mStorageBufferBytes;
private static long getStorageBufferBytes(Context context, File path) {
long lowPercentage = Settings.Global.getInt(context.getContentResolver(),
SYS_STORAGE_THRESHOLD_PERCENTAGE, DEFAULT_THRESHOLD_PERCENTAGE);
long lowBytes = path.getTotalSpace() * lowPercentage / 100;
long maxLowBytes = Settings.Global.getLong(context.getContentResolver(),
SYS_STORAGE_THRESHOLD_MAX_BYTES, DEFAULT_THRESHOLD_MAX_BYTES);
return Math.min(lowBytes, maxLowBytes);
}
public TrickplayStorageManager(Context context, File baseDir, long maxCacheSize) {
mCacheDir = new File(baseDir, CACHE_DIR);
mCacheDir.mkdirs();
mMaxCacheSize = maxCacheSize;
clearStorage();
mStorageBufferBytes = getStorageBufferBytes(context, mCacheDir);
}
@Override
public void clearStorage() {
for (File file : mCacheDir.listFiles()) {
file.delete();
}
}
@Override
public File getCacheDir() {
return mCacheDir;
}
@Override
public boolean isPersistent() {
return false;
}
@Override
public boolean reachedStorageMax(long cacheSize, long pendingDelete) {
return cacheSize - pendingDelete > mMaxCacheSize;
}
@Override
public boolean hasEnoughBuffer(long pendingDelete) {
return mCacheDir.getUsableSpace() + pendingDelete >= mStorageBufferBytes;
}
@Override
public Pair<String, MediaFormat> readTrackInfoFile(boolean isAudio) {
return null;
}
@Override
public ArrayList<Long> readIndexFile(String trackId) {
return null;
}
@Override
public void writeTrackInfoFile(String trackId, MediaFormat format, boolean isAudio) {
}
@Override
public void writeIndexFile(String trackName, SortedMap<Long, SampleCache> index) {
}
}
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