>
> varfloatBuffer = toAudioBuffer(new SampleArray(arrayBuffer));
> sendToFlash(floatBuffer.buffer);
It doesn't worked. I am getting the error in the console log while calling
flash.write method
Error : *SCRIPT438: Object doesn't support property or method 'write'*
While I am trying the below code it is playing the sound with no errors:-
var sampledata = [];
> var freq = 440;
> var interval = null;
> var guacamole= new Guacamole({'swf': 'guacamole.swf'});
>
> function start() {
> interval = setInterval(function() {
> var n = Math.ceil(freq / 100) * 2;
> for (var i=0; i < n; i++) {
> guacamole.write(sampledata); // calls Guacamole.write
> }
> }, 10);
> }
function createSound() {
> var samples = 44100 / freq;
> sampledata = Array(Math.round(samples));
> for (var i=0; i < sampledata.length; i++) {
> sampledata[i] = Math.sin(2*Math.PI * (i /
> sampledata.length));
> }
> }
createSound();start();
> Guacamole.write: function(samples) {
> var out = new Array(samples.length);
> for (var i = 0;i < samples.length; i++) {
> out[i] = this.floatToIntSample(samples[i]);
> }
> as = out.join(' ');
> this.flashElement.write(as); // this write calls the
> flash.write
> },
floatToIntSample: function(value) {
> return Math.floor(value * 32768); // from -1..1 to -32767..32768
> range
> }
swf is embedded in HTML document ..
Please give any suggestions ... What I am missing here ?
I have data coming in audio stream and I have swf to play the sound but
something with the flow of PCM data to swf is missing.
On Fri, Nov 10, 2017 at 10:50 PM, Frode Langelo <[email protected]> wrote:
> On Fri, Nov 10, 2017 at 3:12 AM, Amarjeet Singh <[email protected]>
> wrote:
> > Hi Frode,
> >
> > I really appreciate the response and guidance you provided. It helped me
> to
> > look for more options and created lot of questions in my mind as well.
> >
> > *1. How can I skip these lines in toAudioBuffer ?*
> >
> > var packetTime = context.currentTime;
> > if (nextPacketTime < packetTime)
> > nextPacketTime = packetTime;
> > var audioBuffer = context.createBuffer(format.channels, samples,
> > format.rate);
> >
> > It requires *context.currentTime* but in case of IE context is NULL and
> > nothing will be returned in *packetTime*.
>
> For the purpose of only converting to a float array, you could try
> something like:
>
> var toAudioBuffer = function toAudioBuffer(data) {
>
> // Calculate total number of samples
> var samples = data.length / format.channels;
>
> // Create the Float output audio buffer
> var audioBuffer = new window.Float32Array(data.length);
>
> // Convert each channel
> for (var channel = 0; channel < format.channels; channel++) {
>
> // Fill audio buffer with data for channel
> var offset = channel;
> for (var i = 0; i < samples; i++) {
> audioData[offset] = data[offset] / maxSampleValue;
> offset += format.channels;
> }
>
> }
>
> return audioBuffer;
>
> };
>
>
> > *2. Can I skip pushAudioPacket () and shiftAudioPacket() methods as well
> ?
> > ( I don't know what these methods are trying to do.. )*
>
> These methods are used to buffer, synchronize audio packet playback,
> and rearrange (and split) the packets so that the packets are cut
> where the audio volume is at a low point to reduce the amount of
> audible clipping between packets played back. Fot the purpose of
> getting your prototype working I wouldn't worry about this for now;
> but when you are going for a complete implementation you should look
> at creating a new AudioPlayer implementation for your Flash audio
> player.
>
> > *3. Do I need nextPacketTime as well ? *
> >
> > ( source.start(nextPacketTime); )
>
> Not yet (see above comment)
>
> > *4. Can I directly call toAudioBuffer function passing ArrayBuffer of
> 6048
> > byte and skip the packetTime and context.createBuffer ?*
>
> The toAudioBuffer function expects a SampleArray which in this case is
> an Int16Array. You could do toAudioBuffer(new
> SampleArray(arrayBuffer));
> If you look at the implementation of RawAudioPlayer, it receives the
> raw audio data in playReceivedAudio from ArrayBufferReader.ondata.
>
> > *5. If I use Int16Array over ArrayBuffer It view the data in integers of
> 16
> > byte and if use the following for loop:
> > [snip]
> > It will push the data for left channel together and right channel
> together
> > into an array.
> > Now, Can I pass this data to my Flash Action Script in a string to play
> at
> > 44.1Khz with 2 channels ?
>
> You would need to pass the underlying ArrayBuffer to your Flash
> script. I am not sure if it can consume it directly though.
>
> var floatBuffer = toAudioBuffer(new SampleArray(arrayBuffer));
> sendToFlash(floatBuffer.buffer);
>
>
> > I would be very grateful if you look into the above queries and give some
> > guidance so that I can move forward.
> >
> > Thanks and Regards,
> > Amarjeet Singh
> >
>
