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/*
* 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;
}
}
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