Re: Continuous playback of javascript synthesized consecutive audio buffers causes audio artifacts when no buffer starving occurs.

> It would allow for pre-synthesized audio playback in a glitch free manner.
> 
I'm not sure whether this is to address an implementation bug or a spec shortcoming. The concept of a buffer queue can already be expressed using the AudioBufferSourceNode. Whether it works without glitches in current implementations is likely not a spec shortcoming .. unless it is impossible to create such an implementation, which I don't think is the case.

For instance, see the buffer_queue model at https://github.com/srikumarks/steller/blob/master/src/models/buffer_queue.js. The example code there asks for a function to be called when the queue runs low, but it can sequence buffers passed to the "enqueue" method. 

Reproducing the 440Hz sine tone example here -

   var ac = new AudioContext;
   var sh = new org.anclab.steller.Scheduler(ac);
   var q = sh.models.buffer_queue();
   q.connect(ac.destination);
   q.on('low', function () {
       var phase = 0.0, dphase = 2.0 * Math.PI * 440.0 / 44100.0;
       return function (lowEvent, q) {
           var audioBuffer = q.createBuffer(1, 1024);
           var chan = audioBuffer.getChannelData(0);
           var i;
           for (i = 0; i < 1024; ++i) {
               chan[i] = 0.2 * Math.sin(phase);
               phase += dphase;
           }
           q.enqueue(audioBuffer);
       };
   }());
   q.start(ac.currentTime);

-Kumar

On 30 Oct, 2013, at 12:25 am, Patrick Martin <patrick.martin.r@gmail.com> wrote:

> It would allow for pre-synthesized audio playback in a glitch free manner.
> 
> On Oct 20, 2013 10:06 PM, "Robert O'Callahan" <robert@ocallahan.org> wrote:
> On Mon, Oct 21, 2013 at 6:35 AM, Srikumar Karaikudi Subramanian <srikumarks@gmail.com> wrote:
> What advantage might such an AudioBufferSequenceNode have over a ScriptProcessorNode with a queue processing render function?
> 
> It would probably have the advantage of not being susceptible to small amounts of main-thread jank.
> 
> Rob
> -- 
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