| /* |
| * 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.tv.tuner; |
| |
| import android.util.Log; |
| |
| import com.android.tv.tuner.data.nano.Channel; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Parses plain text formatted scan files, which contain the list of channels. |
| */ |
| public class ChannelScanFileParser { |
| private static final String TAG = "ChannelScanFileParser"; |
| |
| public static final class ScanChannel { |
| public final int type; |
| public final int frequency; |
| public final String modulation; |
| public final String filename; |
| /** |
| * Radio frequency (channel) number specified at |
| * https://en.wikipedia.org/wiki/North_American_television_frequencies |
| * This can be {@code null} for cases like cable signal. |
| */ |
| public final Integer radioFrequencyNumber; |
| |
| public static ScanChannel forTuner(int frequency, String modulation, |
| Integer radioFrequencyNumber) { |
| return new ScanChannel(Channel.TYPE_TUNER, frequency, modulation, null, |
| radioFrequencyNumber); |
| } |
| |
| public static ScanChannel forFile(int frequency, String filename) { |
| return new ScanChannel(Channel.TYPE_FILE, frequency, "file:", filename, null); |
| } |
| |
| private ScanChannel(int type, int frequency, String modulation, String filename, |
| Integer radioFrequencyNumber) { |
| this.type = type; |
| this.frequency = frequency; |
| this.modulation = modulation; |
| this.filename = filename; |
| this.radioFrequencyNumber = radioFrequencyNumber; |
| } |
| } |
| |
| /** |
| * Parses a given scan file and returns the list of {@link ScanChannel} objects. |
| * |
| * @param is {@link InputStream} of a scan file. Each line matches one channel. |
| * The line format of the scan file is as follows:<br> |
| * "A <frequency> <modulation>". |
| * @return a list of {@link ScanChannel} objects parsed |
| */ |
| public static List<ScanChannel> parseScanFile(InputStream is) { |
| BufferedReader in = new BufferedReader(new InputStreamReader(is)); |
| String line; |
| List<ScanChannel> scanChannelList = new ArrayList<>(); |
| try { |
| while ((line = in.readLine()) != null) { |
| if (line.isEmpty()) { |
| continue; |
| } |
| if (line.charAt(0) == '#') { |
| // Skip comment line |
| continue; |
| } |
| String[] tokens = line.split("\\s+"); |
| if (tokens.length != 3 && tokens.length != 4) { |
| continue; |
| } |
| scanChannelList.add(ScanChannel.forTuner(Integer.parseInt(tokens[1]), tokens[2], |
| tokens.length == 4 ? Integer.parseInt(tokens[3]) : null)); |
| } |
| } catch (IOException e) { |
| Log.e(TAG, "error on parseScanFile()", e); |
| } |
| return scanChannelList; |
| } |
| } |