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POLow-latency audio streaming in Flash
 

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  1. POLow-latency audio streaming in Flash
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    <p>Suppose there is a live WAV stream that can be reached at a certain URL, and we need to stream it with as little latency as possible. Using HTML5 <code>&lt;audio&gt;</code> for this task is a no-go, because browsers attempt to pre-buffer several seconds of the stream, and the latency goes up accordingly. That's the reason behind using Flash for this task. However, due to my inexperience with this technology, I only managed to get occasional clicks and white noise. What's wrong in the code below? Thanks.</p> <pre><code>var soundBuffer: ByteArray = new ByteArray(); var soundStream: URLStream = new URLStream(); soundStream.addEventListener(ProgressEvent.PROGRESS, readSound); soundStream.load(new URLRequest(WAV_FILE_URL)); var sound = new Sound(); sound.addEventListener(SampleDataEvent.SAMPLE_DATA,playSound); sound.play(); function readSound(event:ProgressEvent):void { soundStream.readBytes(soundBuffer, 0, soundStream.bytesAvailable); } function playSound(event:SampleDataEvent):void { /* The docs say that if we send too few samples, Sound will consider it an EOF */ var samples:int = (soundBuffer.length - soundBuffer.position) / 4 var toadd:int = 4096 - samples; try { for (var c: int=0; c &lt; samples; c++) { var n:Number = soundBuffer.readFloat(); event.data.writeFloat(n); event.data.writeFloat(n); } } catch(e:Error) { ExternalInterface.call("errorReport", e.message); } for (var d: int = 0; d &lt; toadd; d++) { event.data.writeFloat(0); event.data.writeFloat(0); } } </code></pre>
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    1. COOkay; any advice on the core problem?
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    2. COYup, The sound object can only play MP3s
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    3. CONot quite. The Adobe live docs even contain an example of playing a dynamically generated sine wave using exactly this method (except the loading par, of course). http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WSE523B839-C626-4983-B9C0-07CF1A087ED7.html
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