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/*
* Copyright (C) 2017 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.ffmpeg;
import android.app.Service;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.AssetFileDescriptor;
import android.os.AsyncTask;
import android.os.IBinder;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import com.google.android.exoplayer2.ext.ffmpeg.FfmpegAudioDecoder;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* Ffmpeg based audio decoder service.
* It should be isolatedProcess due to security reason.
*/
public class FfmpegDecoderService extends Service {
private static final String TAG = "FfmpegDecoderService";
private static final boolean DEBUG = false;
private static final String POLICY_FILE = "whitelist.policy";
private static final long MINIJAIL_SETUP_WAIT_TIMEOUT_MS = 5000;
private static boolean sLibraryLoaded = true;
static {
try {
System.loadLibrary("minijail_jni");
} catch (Exception | Error e) {
Log.e(TAG, "Load minijail failed:", e);
sLibraryLoaded = false;
}
}
private FfmpegDecoder mBinder = new FfmpegDecoder();
private volatile Object mMinijailSetupMonitor = new Object();
//@GuardedBy("mMinijailSetupMonitor")
private volatile Boolean mMinijailSetup;
@Override
public void onCreate() {
if (sLibraryLoaded) {
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... params) {
synchronized (mMinijailSetupMonitor) {
int pipeFd = getPolicyPipeFd();
if (pipeFd <= 0) {
Log.e(TAG, "fail to open policy file");
mMinijailSetup = false;
} else {
nativeSetupMinijail(pipeFd);
mMinijailSetup = true;
if (DEBUG) Log.d(TAG, "Minijail setup successfully");
}
mMinijailSetupMonitor.notify();
}
return null;
}
}.execute();
} else {
synchronized (mMinijailSetupMonitor) {
mMinijailSetup = false;
mMinijailSetupMonitor.notify();
}
}
super.onCreate();
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
private int getPolicyPipeFd() {
try {
ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
final ParcelFileDescriptor.AutoCloseOutputStream outputStream =
new ParcelFileDescriptor.AutoCloseOutputStream(pipe[1]);
final AssetFileDescriptor policyFile = getAssets().openFd("whitelist.policy");
final byte[] buffer = new byte[2048];
final FileInputStream policyStream = policyFile.createInputStream();
while (true) {
int bytesRead = policyStream.read(buffer);
if (bytesRead == -1) break;
outputStream.write(buffer, 0, bytesRead);
}
policyStream.close();
outputStream.close();
return pipe[0].detachFd();
} catch (IOException e) {
Log.e(TAG, "Policy file not found:" + e);
}
return -1;
}
private final class FfmpegDecoder extends IFfmpegDecoder.Stub {
FfmpegAudioDecoder mDecoder;
@Override
public boolean isAvailable() {
return isMinijailSetupDone() && FfmpegAudioDecoder.isAvailable();
}
@Override
public void create() {
mDecoder = new FfmpegAudioDecoder(FfmpegDecoderService.this);
}
@Override
public void release() {
if (mDecoder != null) {
mDecoder.release();
mDecoder = null;
}
}
@Override
public void decode(long timeUs, byte[] sample) {
if (!isMinijailSetupDone()) {
// If minijail is not setup, we don't run decode for better security.
return;
}
mDecoder.decode(timeUs, sample);
}
@Override
public void resetDecoderState(String mimetype) {
mDecoder.resetDecoderState(mimetype);
}
@Override
public byte[] getDecodedSample() {
ByteBuffer decodedBuffer = mDecoder.getDecodedSample();
byte[] ret = new byte[decodedBuffer.limit()];
decodedBuffer.get(ret, 0, ret.length);
return ret;
}
@Override
public long getDecodedTimeUs() {
return mDecoder.getDecodedTimeUs();
}
private boolean isMinijailSetupDone() {
synchronized (mMinijailSetupMonitor) {
if (DEBUG) Log.d(TAG, "mMinijailSetup in isAvailable(): " + mMinijailSetup);
if (mMinijailSetup == null) {
try {
if (DEBUG) Log.d(TAG, "Wait till Minijail setup is done");
mMinijailSetupMonitor.wait(MINIJAIL_SETUP_WAIT_TIMEOUT_MS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
return mMinijailSetup != null && mMinijailSetup;
}
}
@Override
public void testSandboxIsolatedProcess() {
if (!isMinijailSetupDone()) {
// If minijail is not setup, we return directly to make the test fail.
return;
}
if (FfmpegDecoderService.this.checkSelfPermission("android.permission.INTERNET")
== PackageManager.PERMISSION_GRANTED) {
throw new SecurityException("Shouldn't have the permission of internet");
}
}
@Override
public void testSandboxMinijail() {
if (!isMinijailSetupDone()) {
// If minijail is not setup, we return directly to make the test fail.
return;
}
nativeTestMinijail();
}
}
private native void nativeSetupMinijail(int policyFd);
private native void nativeTestMinijail();
}
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