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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * @fileoverview | 6 * @fileoverview |
7 * This is a component extension that implements a text-to-speech (TTS) | 7 * This is a component extension that implements a text-to-speech (TTS) |
8 * engine powered by Google's speech synthesis API. | 8 * engine powered by Google's speech synthesis API. |
9 * | 9 * |
10 * This is an "event page", so it's not loaded when the API isn't being used, | 10 * This is an "event page", so it's not loaded when the API isn't being used, |
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31 * @private | 31 * @private |
32 */ | 32 */ |
33 SPEECH_SERVER_URL_: | 33 SPEECH_SERVER_URL_: |
34 'https://www.google.com/speech-api/v2/synthesize?' + | 34 'https://www.google.com/speech-api/v2/synthesize?' + |
35 'enc=mpeg&client=chromium', | 35 'enc=mpeg&client=chromium', |
36 | 36 |
37 /** | 37 /** |
38 * A mapping from language and gender to voice name, hardcoded for now | 38 * A mapping from language and gender to voice name, hardcoded for now |
39 * until the speech synthesis server capabilities response provides this. | 39 * until the speech synthesis server capabilities response provides this. |
40 * The key of this map is of the form '<lang>-<gender>'. | 40 * The key of this map is of the form '<lang>-<gender>'. |
41 * @type {Object.<string, string>} | 41 * @type {Object<string, string>} |
42 * @private | 42 * @private |
43 */ | 43 */ |
44 LANG_AND_GENDER_TO_VOICE_NAME_: { | 44 LANG_AND_GENDER_TO_VOICE_NAME_: { |
45 'en-gb-male': 'rjs', | 45 'en-gb-male': 'rjs', |
46 'en-gb-female': 'fis', | 46 'en-gb-female': 'fis', |
47 }, | 47 }, |
48 | 48 |
49 /** | 49 /** |
50 * The arguments passed to the onSpeak event handler for the utterance | 50 * The arguments passed to the onSpeak event handler for the utterance |
51 * that's currently being spoken. Should be null when no object is | 51 * that's currently being spoken. Should be null when no object is |
52 * pending. | 52 * pending. |
53 * | 53 * |
54 * @type {?{utterance: string, options: Object, callback: Function}} | 54 * @type {?{utterance: string, options: Object, callback: Function}} |
55 * @private | 55 * @private |
56 */ | 56 */ |
57 currentUtterance_: null, | 57 currentUtterance_: null, |
58 | 58 |
59 /** | 59 /** |
60 * The HTML5 audio element we use for playing the sound served by the | 60 * The HTML5 audio element we use for playing the sound served by the |
61 * speech server. | 61 * speech server. |
62 * @type {HTMLAudioElement} | 62 * @type {HTMLAudioElement} |
63 * @private | 63 * @private |
64 */ | 64 */ |
65 audioElement_: null, | 65 audioElement_: null, |
66 | 66 |
67 /** | 67 /** |
68 * A mapping from voice name to language and gender, derived from the | 68 * A mapping from voice name to language and gender, derived from the |
69 * manifest file. This is used in case the speech synthesis request | 69 * manifest file. This is used in case the speech synthesis request |
70 * specifies a voice name but doesn't specify a language code or gender. | 70 * specifies a voice name but doesn't specify a language code or gender. |
71 * @type {Object.<string, {lang: string, gender: string}>} | 71 * @type {Object<string, {lang: string, gender: string}>} |
72 * @private | 72 * @private |
73 */ | 73 */ |
74 voiceNameToLangAndGender_: {}, | 74 voiceNameToLangAndGender_: {}, |
75 | 75 |
76 /** | 76 /** |
77 * This is the main function called to initialize this extension. | 77 * This is the main function called to initialize this extension. |
78 * Initializes data structures and adds event listeners. | 78 * Initializes data structures and adds event listeners. |
79 */ | 79 */ |
80 init: function() { | 80 init: function() { |
81 // Get voices from manifest. | 81 // Get voices from manifest. |
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245 */ | 245 */ |
246 onResume_: function() { | 246 onResume_: function() { |
247 if (this.currentUtterance_) { | 247 if (this.currentUtterance_) { |
248 this.audioElement_.play(); | 248 this.audioElement_.play(); |
249 } | 249 } |
250 } | 250 } |
251 | 251 |
252 }; | 252 }; |
253 | 253 |
254 (new TtsExtension()).init(); | 254 (new TtsExtension()).init(); |
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