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
17package com.android.usbtuner;
18
19import android.content.Context;
20import android.os.ParcelFileDescriptor;
21import android.support.annotation.IntDef;
22import android.util.Log;
23import com.android.usbtuner.DvbDeviceAccessor.DvbDeviceInfoWrapper;
24
25import java.util.List;
26import java.util.SortedSet;
27import java.util.TreeSet;
28
29/**
30 * A class to handle a hardware USB tuner device.
31 */
32public class UsbTunerHal extends TunerHal {
33
34    private static final Object sLock = new Object();
35    // @GuardedBy("sLock")
36    private static final SortedSet<DvbDeviceInfoWrapper> sUsedDvbDevices = new TreeSet<>();
37
38    private final DvbDeviceAccessor mDvbDeviceAccessor;
39    private DvbDeviceInfoWrapper mDvbDeviceInfo;
40
41    protected UsbTunerHal(Context context) {
42        super(context);
43        mDvbDeviceAccessor = new DvbDeviceAccessor(context);
44    }
45
46    @Override
47    protected boolean openFirstAvailable() {
48        List<DvbDeviceInfoWrapper> deviceInfoList = mDvbDeviceAccessor.getDvbDeviceList();
49        if (deviceInfoList == null || deviceInfoList.isEmpty()) {
50            Log.e(TAG, "There's no dvb device attached");
51            return false;
52        }
53        synchronized (sLock) {
54            for (DvbDeviceInfoWrapper deviceInfo : deviceInfoList) {
55                if (!sUsedDvbDevices.contains(deviceInfo)) {
56                    if (DEBUG) Log.d(TAG, "Available device info: " + deviceInfo);
57                    mDvbDeviceInfo = deviceInfo;
58                    sUsedDvbDevices.add(deviceInfo);
59                    return true;
60                }
61            }
62        }
63        Log.e(TAG, "There's no available dvb devices");
64        return false;
65    }
66
67    /**
68     * Acquires the tuner device. The requested device will be locked to the current instance if
69     * it's not acquired by others.
70     *
71     * @param deviceInfo a tuner device to open
72     * @return {@code true} if the operation was successful, {@code false} otherwise
73     */
74    protected boolean open(DvbDeviceInfoWrapper deviceInfo) {
75        if (deviceInfo == null) {
76            Log.e(TAG, "Device info should not be null");
77            return false;
78        }
79        if (mDvbDeviceInfo != null) {
80            Log.e(TAG, "Already acquired");
81            return false;
82        }
83        List<DvbDeviceInfoWrapper> deviceInfoList = mDvbDeviceAccessor.getDvbDeviceList();
84        if (deviceInfoList == null || deviceInfoList.isEmpty()) {
85            Log.e(TAG, "There's no dvb device attached");
86            return false;
87        }
88        for (DvbDeviceInfoWrapper deviceInfoWrapper : deviceInfoList) {
89            if (deviceInfoWrapper.compareTo(deviceInfo) == 0) {
90                synchronized (sLock) {
91                    if (sUsedDvbDevices.contains(deviceInfo)) {
92                        Log.e(TAG, deviceInfo + " is already taken");
93                        return false;
94                    }
95                    sUsedDvbDevices.add(deviceInfo);
96                }
97                if (DEBUG) Log.d(TAG, "Available device info: " + deviceInfo);
98                mDvbDeviceInfo = deviceInfo;
99                return true;
100            }
101        }
102        Log.e(TAG, "There's no such dvb device attached");
103        return false;
104    }
105
106    @Override
107    public void close() {
108        if (mDvbDeviceInfo != null) {
109            if (isStreaming()) {
110                stopTune();
111            }
112            nativeFinalize(mDvbDeviceInfo.getId());
113            synchronized (sLock) {
114                sUsedDvbDevices.remove(mDvbDeviceInfo);
115            }
116            mDvbDeviceInfo = null;
117        }
118    }
119
120    @Override
121    protected boolean isDeviceOpen() {
122        return (mDvbDeviceInfo != null);
123    }
124
125    @Override
126    protected long getDeviceId() {
127        if (mDvbDeviceInfo != null) {
128            return mDvbDeviceInfo.getId();
129        }
130        return -1;
131    }
132
133    @Override
134    protected int openDvbFrontEndFd() {
135        if (mDvbDeviceInfo != null) {
136            ParcelFileDescriptor descriptor = mDvbDeviceAccessor.openDvbDevice(
137                    mDvbDeviceInfo, DvbDeviceAccessor.DVB_DEVICE_FRONTEND);
138            if (descriptor != null) {
139                return descriptor.detachFd();
140            }
141        }
142        return -1;
143    }
144
145    @Override
146    protected int openDvbDemuxFd() {
147        if (mDvbDeviceInfo != null) {
148            ParcelFileDescriptor descriptor = mDvbDeviceAccessor.openDvbDevice(
149                    mDvbDeviceInfo, DvbDeviceAccessor.DVB_DEVICE_DEMUX);
150            if (descriptor != null) {
151                return descriptor.detachFd();
152            }
153        }
154        return -1;
155    }
156
157    @Override
158    protected int openDvbDvrFd() {
159        if (mDvbDeviceInfo != null) {
160            ParcelFileDescriptor descriptor = mDvbDeviceAccessor.openDvbDevice(
161                    mDvbDeviceInfo, DvbDeviceAccessor.DVB_DEVICE_DVR);
162            if (descriptor != null) {
163                return descriptor.detachFd();
164            }
165        }
166        return -1;
167    }
168}
169