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      1 /*
      2  * Copyright (C) 2015 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 
     17 package com.android.usbtuner.exoplayer.cache;
     18 
     19 import android.content.Context;
     20 import android.media.MediaFormat;
     21 import android.provider.Settings;
     22 import android.util.Pair;
     23 
     24 import java.io.File;
     25 import java.util.ArrayList;
     26 import java.util.SortedMap;
     27 
     28 /**
     29  * Manages Trickplay storage.
     30  */
     31 public class TrickplayStorageManager implements CacheManager.StorageManager {
     32     private static final String CACHE_DIR = "timeshift";
     33 
     34     // Copied from android.provider.Settings.Global (hidden fields)
     35     private static final String
     36             SYS_STORAGE_THRESHOLD_PERCENTAGE = "sys_storage_threshold_percentage";
     37     private static final String
     38             SYS_STORAGE_THRESHOLD_MAX_BYTES = "sys_storage_threshold_max_bytes";
     39 
     40     // Copied from android.os.StorageManager
     41     private static final int DEFAULT_THRESHOLD_PERCENTAGE = 10;
     42     private static final long DEFAULT_THRESHOLD_MAX_BYTES = 500L * 1024 * 1024;
     43 
     44     private final File mCacheDir;
     45     private final long mMaxCacheSize;
     46     private final long mStorageBufferBytes;
     47 
     48     private static long getStorageBufferBytes(Context context, File path) {
     49         long lowPercentage = Settings.Global.getInt(context.getContentResolver(),
     50                 SYS_STORAGE_THRESHOLD_PERCENTAGE, DEFAULT_THRESHOLD_PERCENTAGE);
     51         long lowBytes = path.getTotalSpace() * lowPercentage / 100;
     52         long maxLowBytes = Settings.Global.getLong(context.getContentResolver(),
     53                 SYS_STORAGE_THRESHOLD_MAX_BYTES, DEFAULT_THRESHOLD_MAX_BYTES);
     54         return Math.min(lowBytes, maxLowBytes);
     55     }
     56 
     57     public TrickplayStorageManager(Context context, File baseDir, long maxCacheSize) {
     58         mCacheDir = new File(baseDir, CACHE_DIR);
     59         mCacheDir.mkdirs();
     60         mMaxCacheSize = maxCacheSize;
     61         clearStorage();
     62         mStorageBufferBytes = getStorageBufferBytes(context, mCacheDir);
     63     }
     64 
     65     @Override
     66     public void clearStorage() {
     67         for (File file : mCacheDir.listFiles()) {
     68             file.delete();
     69         }
     70     }
     71 
     72     @Override
     73     public File getCacheDir() {
     74         return mCacheDir;
     75     }
     76 
     77     @Override
     78     public boolean isPersistent() {
     79         return false;
     80     }
     81 
     82     @Override
     83     public boolean reachedStorageMax(long cacheSize, long pendingDelete) {
     84         return cacheSize - pendingDelete > mMaxCacheSize;
     85     }
     86 
     87     @Override
     88     public boolean hasEnoughBuffer(long pendingDelete) {
     89         return mCacheDir.getUsableSpace() + pendingDelete >= mStorageBufferBytes;
     90     }
     91 
     92     @Override
     93     public Pair<String, MediaFormat> readTrackInfoFile(boolean isAudio) {
     94         return null;
     95     }
     96 
     97     @Override
     98     public ArrayList<Long> readIndexFile(String trackId) {
     99         return null;
    100     }
    101 
    102     @Override
    103     public void writeTrackInfoFile(String trackId, MediaFormat format, boolean isAudio) {
    104     }
    105 
    106     @Override
    107     public void writeIndexFile(String trackName, SortedMap<Long, SampleCache> index) {
    108     }
    109 
    110 }
    111