Open-ILS/web/js/ui/default/staff/services/audio.js

   1 /**
   2  * Core Service - egAudio
   3  *
   4  * Plays audio files by key name.  Each sound uses a dot-path to indicate
   5  * the sound.
   6  *
   7  * For example:
   8  * sound => 'warning.checkout.no_item'
   9  * URLs are tested in the following order until a valid audio file is found
  10  * or no other paths are left to check.
  11  *
  12  * /audio/notifications/warning/checkout/not_found.wav
  13  * /audio/notifications/warning/checkout.wav
  14  * /audio/notifications/warning.wav
  15  *
  16  * TODO: move audio file base path settings to the template
  17  * for configurability?
  18  *
  19  * Files are only played when sounds are configured to play via
  20  * workstation settings.
  21  */
  22
  23 angular.module('egCoreMod')
  24
  25 .factory('egAudio', ['$q','egHatch', function($q, egHatch) {
  26
  27     var service = {
  28         url_cache : {}, // map key names to audio file URLs
  29         base_url : '/audio/notifications/'
  30     };
  31
  32     /**
  33      * Play the sound found at the requested string path.  'path' is a
  34      * key name which maps to an audio file URL.
  35      */
  36     service.play = function(path) {
  37         if (!path) return;
  38         service.play_url(path, path);
  39     }
  40
  41     service.play_url = function(path, orig_path) {
  42
  43         egHatch.getItem('eg.audio.disable').then(function(audio_disabled) {
  44             if (!audio_disabled) {
  45
  46                 var url = service.url_cache[path] ||
  47                     service.base_url + path.replace(/\./g, '/') + '.wav';
  48
  49                 var player = new Audio(url);
  50
  51                 player.onloadeddata = function() {
  52                     service.url_cache[orig_path] = url;
  53                     player.play();
  54                 };
  55
  56                 if (service.url_cache[path]) {
  57                     // when serving from the cache, avoid secondary URL lookups.
  58                     return;
  59                 }
  60
  61                 player.onerror = function() {
  62                     // Unable to play path at the requested URL.
  63
  64                     if (!path.match(/\./)) {
  65                         // all fall-through options have been exhausted.
  66                         // No path to play.
  67                         console.warn(
  68                             "No suitable URL found for path '" + orig_path + "'");
  69                         return;
  70                     }
  71
  72                     // Fall through to the next (more generic) option
  73                     path = path.replace(/\.[^\.]+$/, '');
  74                     service.play_url(path, orig_path);
  75                 }
  76             }
  77         });
  78     }
  79
  80     return service;
  81 }]);
  82