1 files changed, 110 insertions, 0 deletions
diff --git a/usbtuner/src/com/android/usbtuner/exoplayer/cache/TrickplayStorageManager.java b/usbtuner/src/com/android/usbtuner/exoplayer/cache/TrickplayStorageManager.java
new file mode 100644
index 00000000..801ae534
--- /dev/null
+++ b/usbtuner/src/com/android/usbtuner/exoplayer/cache/TrickplayStorageManager.java
@@ -0,0 +1,110 @@
+/*
+ * 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) {
+    }
+
+}