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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.tv.tuner.exoplayer.buffer;
import android.content.Context;
import android.os.AsyncTask;
import android.provider.Settings;
import android.support.annotation.NonNull;
import android.util.Pair;
import com.android.tv.common.SoftPreconditions;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedMap;
/**
* Manages Trickplay storage.
*/
public class TrickplayStorageManager implements BufferManager.StorageManager {
// TODO: Support multi-sessions.
private static final String BUFFER_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 static AsyncTask<Void, Void, Void> sLastCacheCleanUpTask;
private static File sBufferDir;
private static long sStorageBufferBytes;
private final long mMaxBufferSize;
private static void initParamsIfNeeded(Context context, @NonNull File path) {
// TODO: Support multi-sessions.
SoftPreconditions.checkState(
sBufferDir == null || sBufferDir.equals(path));
if (path.equals(sBufferDir)) {
return;
}
sBufferDir = path;
long lowPercentage = Settings.Global.getInt(context.getContentResolver(),
SYS_STORAGE_THRESHOLD_PERCENTAGE, DEFAULT_THRESHOLD_PERCENTAGE);
long lowPercentageToBytes = path.getTotalSpace() * lowPercentage / 100;
long maxLowBytes = Settings.Global.getLong(context.getContentResolver(),
SYS_STORAGE_THRESHOLD_MAX_BYTES, DEFAULT_THRESHOLD_MAX_BYTES);
sStorageBufferBytes = Math.min(lowPercentageToBytes, maxLowBytes);
}
public TrickplayStorageManager(Context context, @NonNull File baseDir, long maxBufferSize) {
initParamsIfNeeded(context, new File(baseDir, BUFFER_DIR));
sBufferDir.mkdirs();
mMaxBufferSize = maxBufferSize;
clearStorage();
}
private void clearStorage() {
long now = System.currentTimeMillis();
if (sLastCacheCleanUpTask != null) {
sLastCacheCleanUpTask.cancel(true);
}
sLastCacheCleanUpTask = new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
if (isCancelled()) {
return null;
}
File files[] = sBufferDir.listFiles();
if (files == null || files.length == 0) {
return null;
}
for (File file : files) {
if (isCancelled()) {
break;
}
long lastModified = file.lastModified();
if (lastModified != 0 && lastModified < now) {
file.delete();
}
}
return null;
}
};
sLastCacheCleanUpTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
@Override
public File getBufferDir() {
return sBufferDir;
}
@Override
public boolean isPersistent() {
return false;
}
@Override
public boolean reachedStorageMax(long bufferSize, long pendingDelete) {
return bufferSize - pendingDelete > mMaxBufferSize;
}
@Override
public boolean hasEnoughBuffer(long pendingDelete) {
return sBufferDir.getUsableSpace() + pendingDelete >= sStorageBufferBytes;
}
@Override
public List<BufferManager.TrackFormat> readTrackInfoFiles(boolean isAudio) {
return null;
}
@Override
public ArrayList<BufferManager.PositionHolder> readIndexFile(String trackId) {
return null;
}
@Override
public void writeTrackInfoFiles(List<BufferManager.TrackFormat> formatList, boolean isAudio) {
}
@Override
public void writeIndexFile(String trackName,
SortedMap<Long, Pair<SampleChunk, Integer>> index) {
}
}
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