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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.chromecast.internal;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.openhab.core.audio.AudioFormat;
  18 import org.openhab.core.audio.AudioHTTPServer;
  19 import org.openhab.core.audio.AudioStream;
  20 import org.openhab.core.audio.FixedLengthAudioStream;
  21 import org.openhab.core.audio.URLAudioStream;
  22 import org.openhab.core.audio.UnsupportedAudioFormatException;
  23 import org.openhab.core.library.types.OnOffType;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * Handles the AudioSink portion of the Chromecast add-on.
  29  *
  30  * @author Jason Holmes - Initial contribution
  31  */
  32 @NonNullByDefault
  33 public class ChromecastAudioSink {
  34     private final Logger logger = LoggerFactory.getLogger(ChromecastAudioSink.class);
  35
  36     private static final String MIME_TYPE_AUDIO_WAV = "audio/wav";
  37     private static final String MIME_TYPE_AUDIO_MPEG = "audio/mpeg";
  38
  39     private final ChromecastCommander commander;
  40     private final AudioHTTPServer audioHTTPServer;
  41     private final @Nullable String callbackUrl;
  42
  43     public ChromecastAudioSink(ChromecastCommander commander, AudioHTTPServer audioHTTPServer,
  44             @Nullable String callbackUrl) {
  45         this.commander = commander;
  46         this.audioHTTPServer = audioHTTPServer;
  47         this.callbackUrl = callbackUrl;
  48     }
  49
  50     public void process(@Nullable AudioStream audioStream) throws UnsupportedAudioFormatException {
  51         if (audioStream == null) {
  52             // in case the audioStream is null, this should be interpreted as a request to end any currently playing
  53             // stream.
  54             logger.trace("Stop currently playing stream.");
  55             commander.handleCloseApp(OnOffType.ON);
  56         } else {
  57             final String url;
  58             if (audioStream instanceof URLAudioStream) {
  59                 // it is an external URL, the speaker can access it itself and play it.
  60                 URLAudioStream urlAudioStream = (URLAudioStream) audioStream;
  61                 url = urlAudioStream.getURL();
  62             } else {
  63                 if (callbackUrl != null) {
  64                     // we serve it on our own HTTP server
  65                     String relativeUrl;
  66                     if (audioStream instanceof FixedLengthAudioStream) {
  67                         relativeUrl = audioHTTPServer.serve((FixedLengthAudioStream) audioStream, 10);
  68                     } else {
  69                         relativeUrl = audioHTTPServer.serve(audioStream);
  70                     }
  71                     url = callbackUrl + relativeUrl;
  72                 } else {
  73                     logger.warn("We do not have any callback url, so Chromecast cannot play the audio stream!");
  74                     return;
  75                 }
  76             }
  77             commander.playMedia("Notification", url,
  78                     AudioFormat.MP3.isCompatible(audioStream.getFormat()) ? MIME_TYPE_AUDIO_MPEG : MIME_TYPE_AUDIO_WAV);
  79         }
  80     }
  81 }