1 /* 2 * Copyright (C) 2016 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.tv.input; 18 19 import android.net.Uri; 20 import android.support.annotation.Nullable; 21 import android.util.Log; 22 import java.util.ArrayList; 23 import java.util.Iterator; 24 import java.util.List; 25 26 /** A class to manage fake tuners for the tune and the recording. */ 27 public class TunerHelper { 28 private static final String TAG = "TunerHelper"; 29 private static final boolean DEBUG = false; 30 31 private final List<Tuner> mTuners = new ArrayList<>(); 32 private final int mTunerCount; 33 TunerHelper(int tunerCount)34 public TunerHelper(int tunerCount) { 35 mTunerCount = tunerCount; 36 } 37 38 /** Checks whether there are available tuners for the recording. */ tunerAvailableForRecording()39 public boolean tunerAvailableForRecording() { 40 if (mTuners.size() < mTunerCount) { 41 return true; 42 } 43 for (Tuner tuner : mTuners) { 44 if (!tuner.recording) { 45 return true; 46 } 47 } 48 return false; 49 } 50 51 /** 52 * Checks whether there is available tuner. If there's available tuner, it is assigned to the 53 * channel. 54 */ tune(@ullable Uri channelUri, boolean forRecording)55 public boolean tune(@Nullable Uri channelUri, boolean forRecording) { 56 if (channelUri == null) { 57 return false; 58 } 59 for (Tuner tuner : mTuners) { 60 // Find available tuner which is used only for the recording. 61 if (tuner.channelUri.equals(channelUri)) { 62 if (!forRecording && !tuner.tuning) { 63 tuner.tuning = true; 64 return true; 65 } else if (forRecording && !tuner.recording) { 66 tuner.recording = true; 67 return true; 68 } 69 } 70 } 71 if (mTuners.size() < mTunerCount) { 72 // Assign new tuner. 73 mTuners.add(new Tuner(channelUri, forRecording)); 74 return true; 75 } 76 Log.i(TAG, "No available tuners. tuner count: " + mTunerCount); 77 return false; 78 } 79 80 /** Releases the tuner which was being used for the tune. */ stopTune(@ullable Uri channelUri)81 public void stopTune(@Nullable Uri channelUri) { 82 if (channelUri == null) { 83 return; 84 } 85 Tuner candidate = null; 86 Iterator<Tuner> iterator = mTuners.iterator(); 87 while (iterator.hasNext()) { 88 Tuner tuner = iterator.next(); 89 if (tuner.channelUri.equals(channelUri) && tuner.tuning) { 90 if (tuner.recording) { 91 // A tuner which is used both for the tune and recording is the candidate. 92 candidate = tuner; 93 } else { 94 // Remove the tuner which is used only for the tune. 95 if (DEBUG) Log.d(TAG, "Removed tuner for tune"); 96 iterator.remove(); 97 return; 98 } 99 } 100 } 101 if (candidate != null) { 102 candidate.tuning = false; 103 } 104 } 105 106 /** Releases the tuner which was being used for the recording. */ stopRecording(@ullable Uri channelUri)107 public void stopRecording(@Nullable Uri channelUri) { 108 if (channelUri == null) { 109 return; 110 } 111 Tuner candidate = null; 112 Iterator<Tuner> iterator = mTuners.iterator(); 113 while (iterator.hasNext()) { 114 Tuner tuner = iterator.next(); 115 if (tuner.channelUri.equals(channelUri)) { 116 if (tuner.recording) { 117 if (tuner.tuning) { 118 // A tuner which is used both for the tune and recording is the candidate. 119 candidate = tuner; 120 } else { 121 // Remove the tuner which is used only for the recording. 122 iterator.remove(); 123 return; 124 } 125 } else { 126 Log.w(TAG, "Tuner found for " + channelUri + ", but not used for recording"); 127 } 128 } 129 } 130 if (candidate != null) { 131 candidate.recording = false; 132 } 133 } 134 135 private static class Tuner { 136 public final Uri channelUri; 137 public boolean tuning; 138 public boolean recording; 139 Tuner(Uri channelUri, boolean forRecording)140 public Tuner(Uri channelUri, boolean forRecording) { 141 this.channelUri = channelUri; 142 this.tuning = !forRecording; 143 this.recording = forRecording; 144 } 145 } 146 } 147