1 files changed, 108 insertions, 0 deletions
diff --git a/tuner/src/com/android/tv/tuner/ChannelScanFileParser.java b/tuner/src/com/android/tv/tuner/ChannelScanFileParser.java
new file mode 100644
index 00000000..d2ed6c38
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+++ b/tuner/src/com/android/tv/tuner/ChannelScanFileParser.java
@@ -0,0 +1,108 @@
+/*
+ * 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.TunerType.TYPE_TUNER,
+                    frequency,
+                    modulation,
+                    null,
+                    radioFrequencyNumber);
+        }
+
+        public static ScanChannel forFile(int frequency, String filename) {
+            return new ScanChannel(Channel.TunerType.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 &lt;frequency&gt; &lt;modulation&gt;".
+     * @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;
+    }
+}