0
人們已經想出瞭如何使用Google Speech API（Speech-To-Text）。我試圖讓它與Flash Speex編解碼器一起工作，但我無法弄清楚。我試過在每個160字節之前插入幀大小字節（正如一些消息來源所說），但這不起作用。Google Speech API的Flash SPEEX編解碼器 - 挑戰
所以我發佈了一個挑戰，以某種方式翻譯谷歌語音API的Flash speex字節來理解。
這是基本的Flex代碼：
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="init();">
<fx:Script>
<![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 & 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 < 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();
}
}
]]>
</fx:Script>
<s:HGroup>
<s:Button label="Record"
click="record(event)"/>
<s:Button label="Stop and Send"
click="stop(event)"/>
</s:HGroup>
</s:Application>
欲瞭解更多信息檢查此鏈接：http://mikepultz.com/2011/03/accessing-google-speech-api-chrome-11/和Does Chrome have built-in speech recognition for "x-webkit-speech" input elements?