2 * Sonitus - StreamSource.java - Copyright © 2013 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sonitus.data.source;
20 import java.io.BufferedInputStream;
21 import java.io.IOException;
22 import java.net.HttpURLConnection;
24 import java.net.URLConnection;
25 import java.util.Collections;
26 import java.util.List;
28 import java.util.logging.Logger;
30 import net.pterodactylus.sonitus.data.AbstractFilter;
31 import net.pterodactylus.sonitus.data.ContentMetadata;
32 import net.pterodactylus.sonitus.data.Controller;
33 import net.pterodactylus.sonitus.data.DataPacket;
34 import net.pterodactylus.sonitus.data.FormatMetadata;
35 import net.pterodactylus.sonitus.data.Metadata;
36 import net.pterodactylus.sonitus.io.MetadataStream;
38 import com.google.common.base.Optional;
39 import com.google.common.collect.Maps;
40 import com.google.common.primitives.Ints;
43 * {@link Source} implementation that can download an audio stream from a
46 * Currently only “audio/mpeg” (aka MP3) streams are supported.
48 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
50 public class StreamSource extends AbstractFilter {
53 private static final Logger logger = Logger.getLogger(StreamSource.class.getName());
55 /** The URL of the stream. */
56 private final String streamUrl;
58 /** The name of the station. */
59 private final String streamName;
61 /** The metadata stream. */
62 private final MetadataStream metadataStream;
65 * Creates a new stream source. This will also connect to the server and parse
66 * the response header for vital information (sampling frequency, number of
70 * The URL of the stream
72 * if an I/O error occurs
74 public StreamSource(String streamUrl) throws IOException {
76 this.streamUrl = streamUrl;
77 URL url = new URL(streamUrl);
79 /* set up connection. */
80 URLConnection urlConnection = url.openConnection();
81 if (!(urlConnection instanceof HttpURLConnection)) {
82 throw new IllegalArgumentException("Not an HTTP URL!");
84 HttpURLConnection httpUrlConnection = (HttpURLConnection) urlConnection;
85 httpUrlConnection.setRequestProperty("ICY-Metadata", "1");
88 logger.info(String.format("Connecting to %s...", streamUrl));
89 httpUrlConnection.connect();
91 /* check content type. */
92 String contentType = httpUrlConnection.getContentType();
93 if (!contentType.startsWith("audio/mpeg")) {
94 throw new IllegalArgumentException("Not an MP3 stream!");
97 /* get ice-audio-info header. */
98 String iceAudioInfo = httpUrlConnection.getHeaderField("ICE-Audio-Info");
99 if (iceAudioInfo == null) {
100 throw new IllegalArgumentException("No ICE Audio Info!");
103 /* parse ice-audio-info header. */
104 String[] audioInfos = iceAudioInfo.split(";");
105 Map<String, Integer> audioParameters = Maps.newHashMap();
106 for (String audioInfo : audioInfos) {
107 String key = audioInfo.substring(0, audioInfo.indexOf('=')).toLowerCase();
108 int value = Ints.tryParse(audioInfo.substring(audioInfo.indexOf('=') + 1));
109 audioParameters.put(key, value);
112 /* check metadata interval. */
113 String metadataIntervalHeader = httpUrlConnection.getHeaderField("ICY-MetaInt");
114 if (metadataIntervalHeader == null) {
115 throw new IllegalArgumentException("No Metadata Interval header!");
117 Integer metadataInterval = Ints.tryParse(metadataIntervalHeader);
118 if (metadataInterval == null) {
119 throw new IllegalArgumentException(String.format("Invalid Metadata Interval header: %s", metadataIntervalHeader));
122 metadataUpdated(new Metadata(new FormatMetadata(audioParameters.get("ice-channels"), audioParameters.get("ice-samplerate"), "MP3"), new ContentMetadata()));
123 metadataStream = new MetadataStream(new BufferedInputStream(httpUrlConnection.getInputStream()), metadataInterval);
124 streamName = httpUrlConnection.getHeaderField("ICY-Name");
132 public String name() {
137 public List<Controller<?>> controllers() {
138 return Collections.emptyList();
142 public Metadata metadata() {
143 Optional<ContentMetadata> streamMetadata = metadataStream.getContentMetadata();
144 if (!streamMetadata.isPresent()) {
145 return super.metadata();
147 metadataUpdated(super.metadata().title(streamMetadata.get().title()));
148 return super.metadata();
152 public void open(Metadata metadata) throws IOException {
153 /* ignore metadata when opening. */
157 public DataPacket get(int bufferSize) throws IOException {
158 byte[] buffer = new byte[bufferSize];
159 metadataStream.read(buffer);
160 return new DataPacket(metadata(), buffer);
168 public String toString() {
169 return String.format("StreamSource(%s,%s)", streamUrl, metadata());