watson-speech
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IBM Watson Speech to Text and Text to Speech SDK for web browsers.
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<title>JSDoc: Source: speech-to-text/file-player.js</title>
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<h1 class="page-title">Source: speech-to-text/file-player.js</h1>
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<pre class="prettyprint source linenums"><code>'use strict';
var contentType = require('./content-type');
function getContentType(file) {
return new Promise(function (resolve, reject) {
var blobToText = new Blob([file]).slice(0, 4);
var r = new FileReader();
r.readAsText(blobToText);
r.onload = function () {
var ct = contentType(r.result);
if (ct) {
resolve(ct);
} else {
var err = new Error('Unable to determine content type from file header; only wav, flac, and ogg/opus are supported.');
err.name = 'UNRECOGNIZED_FORMAT';
reject(err)
}
};
});
}
/**
* Plays audio from File/Blob instances
* @param file
* @param contentType
* @constructor
*/
function FilePlayer(file, contentType) {
var audio = this.audio = new Audio();
if (audio.canPlayType(contentType)) {
audio.src = URL.createObjectURL(new Blob([file], {type: contentType}));
audio.play();
} else {
// if we emit an error, it prevents the promise from returning the actual result
// however, most browsers do not support flac, so this is a reasonably scenario
var err = new Error('Current browser is unable to play back ' + contentType);
err.name = 'UNSUPPORTED_FORMAT';
err.contentType = contentType;
throw err;
}
this.stop = function stop() {
audio.pause();
audio.currentTime = 0;
}
}
function playFile(file) {
return getContentType(file).then(function (contentType) {
return new FilePlayer(file, contentType);
});
}
module.exports = FilePlayer;
module.exports.getContentType = getContentType;
module.exports.playFile = playFile;
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-watson-speech.html">watson-speech</a></li><li><a href="module-watson-speech_speech-to-text.html">watson-speech/speech-to-text</a></li><li><a href="module-watson-speech_speech-to-text_recognize-element.html">watson-speech/speech-to-text/recognize-element</a></li><li><a href="module-watson-speech_speech-to-text_recognize-file.html">watson-speech/speech-to-text/recognize-file</a></li><li><a href="module-watson-speech_speech-to-text_recognize-microphone.html">watson-speech/speech-to-text/recognize-microphone</a></li><li><a href="module-watson-speech_text-to-speech.html">watson-speech/text-to-speech</a></li><li><a href="module-watson-speech_text-to-speech_get-voices.html">watson-speech/text-to-speech/get-voices</a></li><li><a href="module-watson-speech_text-to-speech_synthesize.html">watson-speech/text-to-speech/synthesize</a></li></ul><h3>Classes</h3><ul><li><a href="FilePlayer.html">FilePlayer</a></li><li><a href="FormatStream.html">FormatStream</a></li><li><a href="MediaElementAudioStream.html">MediaElementAudioStream</a></li><li><a href="RecognizeStream.html">RecognizeStream</a></li><li><a href="TimingStream.html">TimingStream</a></li><li><a href="WebAudioL16Stream.html">WebAudioL16Stream</a></li><li><a href="WritableElementStream.html">WritableElementStream</a></li></ul><h3>Events</h3><ul><li><a href="RecognizeStream.html#event:close">close</a></li><li><a href="RecognizeStream.html#event:connection-close">connection-close</a></li><li><a href="RecognizeStream.html#event:data">data</a></li><li><a href="RecognizeStream.html#event:error">error</a></li><li><a href="RecognizeStream.html#event:results">results</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.0</a> on Wed Feb 24 2016 18:53:09 GMT+0000 (UTC)
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