content: /*
   This file is part of Airsonic.
  
   Airsonic is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
  
   Airsonic is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
  
   You should have received a copy of the GNU General Public License
   along with Airsonic.  If not, see <http://www.gnu.org/licenses/>.
  
   Copyright 2016 (C) Airsonic Authors
   Based upon Subsonic, Copyright 2009 (C) Sindre Mehus
   */
  package org.airsonic.player.io;
  
  import org.airsonic.player.domain.*;
  import org.airsonic.player.service.AudioScrobblerService;
  import org.airsonic.player.service.MediaFileService;
  import org.airsonic.player.service.SearchService;
  import org.airsonic.player.service.TranscodingService;
  import org.airsonic.player.service.sonos.SonosHelper;
  import org.airsonic.player.util.FileUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  
  /**
   * Implementation of {@link InputStream} which reads from a {@link PlayQueue}.
   *
   * @author Sindre Mehus
   */
  public class PlayQueueInputStream extends InputStream {
  
      private static final Logger LOG = LoggerFactory.getLogger(PlayQueueInputStream.class);
  
      private final Player player;
      private final TransferStatus status;
      private final Integer maxBitRate;
      private final String preferredTargetFormat;
      private final VideoTranscodingSettings videoTranscodingSettings;
      private final TranscodingService transcodingService;
      private final AudioScrobblerService audioScrobblerService;
      private final MediaFileService mediaFileService;
      private MediaFile currentFile;
      private InputStream currentInputStream;
      private SearchService searchService;
  
      public PlayQueueInputStream(Player player, TransferStatus status, Integer maxBitRate, String preferredTargetFormat,
                                  VideoTranscodingSettings videoTranscodingSettings, TranscodingService transcodingService,
                                  AudioScrobblerService audioScrobblerService, MediaFileService mediaFileService, SearchService searchService) {
          this.player = player;
          this.status = status;
          this.maxBitRate = maxBitRate;
          this.preferredTargetFormat = preferredTargetFormat;
          this.videoTranscodingSettings = videoTranscodingSettings;
          this.transcodingService = transcodingService;
          this.audioScrobblerService = audioScrobblerService;
          this.mediaFileService = mediaFileService;
          this.searchService = searchService;
      }
  
      @Override
      public int read() throws IOException {
          byte[] b = new byte[1];
          int n = read(b);
          return n == -1 ? -1 : b[0];
      }
  
      @Override
      public int read(byte[] b) throws IOException {
          return read(b, 0, b.length);
      }
  
      @Override
      public int read(byte[] b, int off, int len) throws IOException {
          prepare();
          if (currentInputStream == null || player.getPlayQueue().getStatus() == PlayQueue.Status.STOPPED) {
              return -1;
          }
  
          int n = currentInputStream.read(b, off, len);
  
          // If end of song reached, skip to next song and call read() again.
          if (n == -1) {
              player.getPlayQueue().next();
              close();
              return read(b, off, len);
          } else {
              status.addBytesTransfered(n);
          }
          return n;
      }
  
      private void prepare() throws IOException {
          PlayQueue playQueue = player.getPlayQueue();
  
          // If playlist is in auto-random mode, populate it with new random songs.
          if (playQueue.getIndex() == -1 && playQueue.getRandomSearchCriteria() != null) {
              populateRandomPlaylist(playQueue);
          }
  
          MediaFile result;
          synchronized (playQueue) {
              result = playQueue.getCurrentFile();
          }
          MediaFile file = result;
          if (file == null) {
              close();
          } else if (!file.equals(currentFile)) {
              close();
              LOG.info("{}: {} listening to {}", player.getIpAddress(), player.getUsername(), FileUtil.getShortPath(file.getFile()));
              mediaFileService.incrementPlayCount(file);
  
              // Don't scrobble REST players (except Sonos)
              if (player.getClientId() == null || player.getClientId().equals(SonosHelper.AIRSONIC_CLIENT_ID)) {
                  audioScrobblerService.register(file, player.getUsername(), false, null);
              }
  
              TranscodingService.Parameters parameters = transcodingService.getParameters(file, player, maxBitRate, preferredTargetFormat, videoTranscodingSettings);
              currentInputStream = transcodingService.getTranscodedInputStream(parameters);
              currentFile = file;
              status.setFile(currentFile.getFile());
          }
      }
  
      private void populateRandomPlaylist(PlayQueue playQueue) {
          List<MediaFile> files = searchService.getRandomSongs(playQueue.getRandomSearchCriteria());
          playQueue.addFiles(false, files);
          LOG.info("Recreated random playlist with " + playQueue.size() + " songs.");
      }
  
      @Override
      public void close() throws IOException {
          try {
              if (currentInputStream != null) {
                  currentInputStream.close();
              }
          } finally {
              // Don't scrobble REST players (except Sonos)
              if (player.getClientId() == null || player.getClientId().equals(SonosHelper.AIRSONIC_CLIENT_ID)) {
                  audioScrobblerService.register(currentFile, player.getUsername(), true, null);
              }
              currentInputStream = null;
              currentFile = null;
          }
      }
  }
  