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   1  <?php
   2  // $Id: audio_feeds.feeds.inc,v 1.4 2009/11/25 19:33:13 drewish Exp $
   3  
   4  /**
   5   * @file
   6   * This file provides various XML feeds for audio media.
   7   */
   8  
   9  /**
  10   * Menu Callback to generate M3U feed
  11   */
  12  function audio_feeds_m3u($node) {
  13    $items = array();
  14  
  15    // prepare feed metadata
  16    $metadata = array('title' => $node->title);
  17  
  18    // prepare feed items
  19    $children = audio_feeds_children($node);
  20    foreach ($children as $audio) {
  21      $items[] = array(
  22        'title' => $audio->audio_tags['title'] ? $audio->audio_tags['title'] : $audio->title,
  23        'author' => $audio->audio_tags['artist'],
  24        'duration' => $audio->audio_file['playtime'],
  25        'enclosure' => array('url' => $audio->url_play),
  26      );
  27    }
  28    audio_feeds_generate_m3u($items, $metadata);
  29  }
  30  
  31  /**
  32   * Return XML for M3U feed
  33   */
  34  function audio_feeds_generate_m3u($items = array(), $metadata = array()) {
  35    $output = "#EXTM3U\r\n";
  36    foreach ($items as $item) {
  37      $title = $item['author'] ? $item['author'] ." - ". $item['title'] : $item['title'];
  38      $output .= "#EXTINF:". check_plain($item['duration']) .",". check_plain($title) ."\r\n";
  39      $output .= check_plain($item['enclosure']['url']) ."\r\n";
  40    }
  41    drupal_set_header("Pragma: no-cache"); // HTTP/1.0
  42    drupal_set_header("Cache-Control: private"); // HTTP/1.1
  43    drupal_set_header("Content-Type: audio/mpegurl", TRUE);
  44    drupal_set_header("Content-Length: ". strlen($output), TRUE);
  45    drupal_set_header("Content-Disposition: attachment; filename=\"". check_plain($metadata['title']) .".m3u\"", TRUE);
  46    print $output;
  47    exit();
  48  }
  49  
  50  /**
  51   * Menu Callback to generate PLS feed
  52   */
  53  function audio_feeds_pls($node) {
  54    $items = array();
  55  
  56    // prepare feed metadata
  57    $metadata = array('title' => $node->title);
  58  
  59    // prepare feed items
  60    $children = audio_feeds_children($node);
  61    foreach ($children as $audio) {
  62      $items[] = array(
  63        'title' => $audio->audio_tags['title'] ? $audio->audio_tags['title'] : $audio->title,
  64        'author' => $audio->audio_tags['artist'],
  65        'duration' => $audio->audio_file['playtime'],
  66        'enclosure' => array('url' => $audio->url_play),
  67      );
  68    }
  69    audio_feeds_generate_pls($items, $metadata);
  70  }
  71  
  72  /**
  73   * Return XML for PLS feed
  74   */
  75  function audio_feeds_generate_pls($items = array(), $metadata = array()) {
  76    $output = "[playlist]\r\n";
  77    $i = 1;
  78    foreach ($items as $item) {
  79      $title = $item['author'] ? $item['author'] ." - ". $item['title'] : $item['title'];
  80      $output .= "File$i=". check_plain($item['enclosure']['url']) ."\r\n";
  81      $output .= "Title$i=". check_plain($title) ."\r\n";
  82      $output .= "Length$i=". check_plain($item['duration']) ."\r\n";
  83      $i++;
  84    }
  85    $output .= "NumberOfEntries=". count($items) ."\r\n";
  86    $output .= "Version=2\r\n";
  87    drupal_set_header("Pragma: no-cache"); // HTTP/1.0
  88    drupal_set_header("Cache-Control: private"); // HTTP/1.1
  89    drupal_set_header("Content-Type: audio/x-scpls", TRUE);
  90    drupal_set_header("Content-Length: ". strlen($output), TRUE);
  91    drupal_set_header("Content-Disposition: attachment; filename=\"". check_plain($metadata['title']) .".pls\"", TRUE);
  92    print $output;
  93    exit();
  94  }
  95  
  96  /**
  97   * Menu Callback to generate XSPF feed
  98   */
  99  function audio_feeds_xspf($node) {
 100    global $base_url;
 101    $children = audio_feeds_children($node);
 102  
 103    // prepare feed metadata
 104    $metadata = array(
 105      'title' => $node->title,
 106      'author' => $node->name,
 107      'link' => url('node/'. $node->nid, array('absolute' => TRUE)),
 108      'feed_url' => url('node/'. $node->nid .'/xspf', array('absolute' => TRUE)),
 109      //'copyright' => $node->playlist_info['copyright']
 110    );
 111  
 112    // prepare feed items
 113    $items = array();
 114    foreach ($children as $audio) {
 115      // use the first image uploaded as the included image
 116      $image = is_array($audio->audio_images) ? current($audio->audio_images) : '';
 117      $items[] = array(
 118        'title' => $audio->audio_tags['title'] ? $audio->audio_tags['title'] : $audio->title,
 119        'author' => $audio->audio_tags['artist'],
 120        'album' => $audio->audio_tags['album'],
 121        'duration' => $audio->audio_file['playtime'],
 122        'link' => url('node/'. $audio->nid, array('absolute' => TRUE)),
 123        'image' => array('url' => $base_url .'/'. $image['filepath']),
 124        'enclosure' => array('url' => $audio->url_play),
 125      );
 126    }
 127    audio_feeds_generate_xspf($items, $metadata);
 128  }
 129  
 130  /**
 131   * Return XML for XSPF feed
 132   */
 133  function audio_feeds_generate_xspf($items = array(), $metadata = array()) {
 134    $output = '<?xml version="1.0" encoding="UTF-8"?>';
 135    $output .= '<playlist version="1" xmlns="http://xspf.org/ns/0/">';
 136    $output .= "<title>". check_plain($metadata['title']) ."</title>";
 137    $output .= "<annotation>". check_plain($metadata['author']) ."</annotation>";
 138    $output .= "<creator>". check_plain($metadata['author']) ."</creator>";
 139    $output .= "<info>". check_plain($metadata['link']) ."</info>";
 140    $output .= "<location>". check_plain($metadata['feed_url']) ."</location>";
 141    $output .= "<license>". check_plain($metadata['copyright']) ."</license>";
 142    $output .= '<trackList>';
 143    foreach ($items as $item) {
 144      $output .= '<track>';
 145      $output .= "<location>". check_plain($item['enclosure']['url']) ."</location>";
 146      $output .= "<creator>". check_plain($item['author']) ."</creator>";
 147      $output .= "<album>". check_plain($item['album']) ."</album>";
 148      $output .= "<title>". check_plain($item['title']) ."</title>";
 149      $annotation = $item['author'] ? $item['author'] ." - ". $item['title'] : $item['title'];
 150      $output .= "<annotation>". check_plain($annotation) ."</annotation>";
 151      $output .= "<duration>". check_plain($item['duration']) ."</duration>";
 152      $output .= "<image>". check_plain($item['image']['url']) ."</image>";
 153      $output .= "<info>". check_plain($item['link']) ."</info>";
 154      $output .= '</track>';
 155    }
 156    $output .= '  </trackList>';
 157    $output .= '</playlist>';
 158  
 159    // hopefully fixing 212913, i suspect nul's are making this choke
 160    // remove any nul characters
 161    $output = str_replace("\0", '', $output);
 162  
 163    drupal_set_header('Content-Type: text/xml; charset=utf-8');
 164    print $output;
 165    exit();
 166  }
 167  
 168  /**
 169   * Get the attached audio nodes.
 170   *
 171   * @param object $node
 172   *   The node whose audio nodes are to be retrieved.
 173   * @return
 174   *   An array containing all the audio nodes attached to a given node.
 175   */
 176  function audio_feeds_children($node) {
 177    $children = array();
 178    
 179    // Find all nodereferences.
 180    $fields = content_fields(NULL, $node->type);
 181    foreach ($fields as $field_name => $field) {
 182      if ($field['type'] == 'nodereference' && is_array($node->{$field_name})) {
 183        foreach ($node->{$field_name} as $item) {
 184          // Keep only those references that are actually accessible and
 185          // downloadable audio nodes.
 186          if (($child = node_load($item['nid'])) && node_access('view', $child) && _audio_allow_play($child)) {
 187            $children[] = $child;
 188          }
 189        }
 190      }
 191    }
 192    
 193    return $children;
 194  }