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POFlash SPEEX codec coversion for Google Speech API - a challenge
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  1. POFlash SPEEX codec coversion for Google Speech API - a challenge
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    copied!<p>People have figured out how to use the Google Speech API (Speech-To-Text). I'm trying to get it working with Flash Speex codec, and I just can't figure it out. I've tried inserting frame size byte before each 160 bytes (as some sources say), but this doesn't work.</p> <p>So I post a challenge to somehow translate the flash speex bytes for Google Speech API to understand.</p> <p>Here is basic flex code:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" creationComplete="init();"&gt; &lt;fx:Script&gt; &lt;![CDATA[ // Speech API info // Reference: http://mikepultz.com/2011/03/accessing-google-speech-api-chrome-11/, // Reference: https://stackoverflow.com/questions/4361826/does-chrome-have-buil-in-speech-recognition-for-input-type-text-x-webkit-speec private static const speechApiUrl:String = "http://www.google.com/speech-api/v1/recognize"; private static const speechLanguage:String = "en"; private static const mimeType:String = "audio/x-speex-with-header-byte"; private static const sampleRate:uint = 8; // Sound bytes &amp; mic private var soundBytes:ByteArray; private var microphone:Microphone; // Initial setup private function init():void { // Set up the microphone microphone = Microphone.getMicrophone(); // Speech API supports 8khz and 16khz rates microphone.rate = sampleRate; // Select the SPEEX codec microphone.codec = SoundCodec.SPEEX; // I don't know what effect this has... microphone.framesPerPacket = 1; } // THIS IS THE CHALLENGE // We have the flash speex bytes and we need to translate them so Google API understands private function process():void{ soundBytes.position = 0; var processed:ByteArray = new ByteArray(); processed.endian = Endian.BIG_ENDIAN; var frameSize:uint = 160; for(var n:uint = 0; n &lt; soundBytes.bytesAvailable / frameSize; n++){ processed.writeByte(frameSize); processed.writeBytes(soundBytes, frameSize * n, frameSize); } processed.position = 0; soundBytes = processed; } // Sending to Google Speech server private function send():void { var loader:URLLoader = new URLLoader(); var request:URLRequest = new URLRequest(speechApiUrl + "?lang=" + speechLanguage); request.method = URLRequestMethod.POST; request.data = soundBytes; request.contentType = mimeType + "; rate=" + (1000 * sampleRate); loader.addEventListener(Event.COMPLETE, onComplete); loader.addEventListener(IOErrorEvent.IO_ERROR, onError); loader.load(request); trace("Connecting to Speech API server"); } private function onError(event:IOErrorEvent):void{ trace("Error: " + event.toString()); } private function onComplete(event:Event):void{ trace("Done: " + event.target.data); } private function record(event:Event):void{ soundBytes = new ByteArray(); soundBytes.endian = Endian.BIG_ENDIAN; microphone.addEventListener(SampleDataEvent.SAMPLE_DATA, sampleData); } private function sampleData(event:SampleDataEvent):void { soundBytes.writeBytes(event.data, 0, event.data.bytesAvailable); } private function stop(e:Event):void { microphone.removeEventListener(SampleDataEvent.SAMPLE_DATA, sampleData); if(soundBytes != null){ process(); send(); } } ]]&gt; &lt;/fx:Script&gt; &lt;s:HGroup&gt; &lt;s:Button label="Record" click="record(event)"/&gt; &lt;s:Button label="Stop and Send" click="stop(event)"/&gt; &lt;/s:HGroup&gt; &lt;/s:Application&gt; </code></pre> <p>For more info check this links: <a href="http://mikepultz.com/2011/03/accessing-google-speech-api-chrome-11/" rel="nofollow noreferrer">http://mikepultz.com/2011/03/accessing-google-speech-api-chrome-11/</a> and <a href="https://stackoverflow.com/questions/4361826/does-chrome-have-buil-in-speech-recognition-for-input-type-text-x-webkit-speec">Does Chrome have built-in speech recognition for &quot;x-webkit-speech&quot; input elements?</a></p>
 

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