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authortoasted-nutbread <toasted-nutbread@users.noreply.github.com>2020-05-02 12:50:16 -0400
committerGitHub <noreply@github.com>2020-05-02 12:50:16 -0400
commitcae6b657ab418a1cafedcb1cf72d0e793fa5178b (patch)
treec50f77c713aa3573cbcea713fcede188d9d536cd /ext/mixed/js/audio-system.js
parent08ada6844af424e8ff28e592fc6b9dbc1a9a97eb (diff)
Anki audio download (#477)
* Update how audio is added to Anki cards * Upgrade Anki templates * Update comments
Diffstat (limited to 'ext/mixed/js/audio-system.js')
-rw-r--r--ext/mixed/js/audio-system.js78
1 files changed, 67 insertions, 11 deletions
diff --git a/ext/mixed/js/audio-system.js b/ext/mixed/js/audio-system.js
index 3273f982..108cfc72 100644
--- a/ext/mixed/js/audio-system.js
+++ b/ext/mixed/js/audio-system.js
@@ -79,7 +79,7 @@ class AudioSystem {
async getDefinitionAudio(definition, sources, details) {
const key = `${definition.expression}:${definition.reading}`;
- const hasCache = (this._cache !== null);
+ const hasCache = (this._cache !== null && !details.disableCache);
if (hasCache) {
const cacheValue = this._cache.get(key);
@@ -98,7 +98,11 @@ class AudioSystem {
if (uri === null) { continue; }
try {
- const audio = await this._createAudio(uri);
+ const audio = (
+ details.binary ?
+ await this._createAudioBinary(uri) :
+ await this._createAudio(uri)
+ );
if (hasCache) {
this._cacheCheck();
this._cache.set(key, {audio, uri, source});
@@ -124,6 +128,14 @@ class AudioSystem {
// NOP
}
+ _getAudioUri(definition, source, details) {
+ return (
+ this._audioUriBuilder !== null ?
+ this._audioUriBuilder.getUri(definition, source, details) :
+ null
+ );
+ }
+
async _createAudio(uri) {
const ttsParameters = this._getTextToSpeechParameters(uri);
if (ttsParameters !== null) {
@@ -134,21 +146,20 @@ class AudioSystem {
return await this._createAudioFromUrl(uri);
}
- _getAudioUri(definition, source, details) {
- return (
- this._audioUriBuilder !== null ?
- this._audioUriBuilder.getUri(definition, source, details) :
- null
- );
+ async _createAudioBinary(uri) {
+ const ttsParameters = this._getTextToSpeechParameters(uri);
+ if (ttsParameters !== null) {
+ throw new Error('Cannot create audio from text-to-speech');
+ }
+
+ return await this._createAudioBinaryFromUrl(uri);
}
_createAudioFromUrl(url) {
return new Promise((resolve, reject) => {
const audio = new Audio(url);
audio.addEventListener('loadeddata', () => {
- const duration = audio.duration;
- if (duration === 5.694694 || duration === 5.720718) {
- // Hardcoded values for invalid audio
+ if (!this._isAudioValid(audio)) {
reject(new Error('Could not retrieve audio'));
} else {
resolve(audio);
@@ -158,6 +169,42 @@ class AudioSystem {
});
}
+ _createAudioBinaryFromUrl(url) {
+ return new Promise((resolve, reject) => {
+ const xhr = new XMLHttpRequest();
+ xhr.responseType = 'arraybuffer';
+ xhr.addEventListener('load', () => {
+ const arrayBuffer = xhr.response;
+ if (!this._isAudioBinaryValid(arrayBuffer)) {
+ reject(new Error('Could not retrieve audio'));
+ } else {
+ resolve(arrayBuffer);
+ }
+ });
+ xhr.addEventListener('error', () => reject(new Error('Failed to connect')));
+ xhr.open('GET', url);
+ xhr.send();
+ });
+ }
+
+ _isAudioValid(audio) {
+ const duration = audio.duration;
+ return (
+ duration !== 5.694694 && // jpod101 invalid audio (Chrome)
+ duration !== 5.720718 // jpod101 invalid audio (Firefox)
+ );
+ }
+
+ _isAudioBinaryValid(arrayBuffer) {
+ const digest = TextToSpeechAudio.arrayBufferDigest(arrayBuffer);
+ switch (digest) {
+ case 'ae6398b5a27bc8c0a771df6c907ade794be15518174773c58c7c7ddd17098906': // jpod101 invalid audio
+ return false;
+ default:
+ return true;
+ }
+ }
+
_getTextToSpeechVoiceFromVoiceUri(voiceUri) {
try {
for (const voice of speechSynthesis.getVoices()) {
@@ -195,4 +242,13 @@ class AudioSystem {
this._cache.delete(key);
}
}
+
+ static async arrayBufferDigest(arrayBuffer) {
+ const hash = new Uint8Array(await crypto.subtle.digest('SHA-256', new Uint8Array(arrayBuffer)));
+ let digest = '';
+ for (const byte of hash) {
+ digest += byte.toString(16).padStart(2, '0');
+ }
+ return digest;
+ }
}