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Web Audio API #1

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Web Audio API #1

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cba06c4
xhr.response
galeksandrp Aug 6, 2016
a617c23
Web Audio API
galeksandrp Aug 6, 2016
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28 changes: 27 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -68,10 +68,17 @@ <h2>Demo:</h2>
pcm=[];
value=kjmp2_decode_frame(mp2,frame,pcm,l,r);
if (value) {
if (!!(window.AudioContext || window.webkitAudioContext)) {
for(var i=0;i<l.length;i++){
lchannel.push(l[i]);
rchannel.push(r[i]);
};
} else {
for(var i=0;i<l.length;i++){
dec.push(l[i]);
dec.push(r[i]);
};
}
frame=frame.subarray(value);
bytes_left -= value;
t.innerHTML="Bytes left to decode: " +bytes_left;
Expand Down Expand Up @@ -106,9 +113,11 @@ <h2>Demo:</h2>
get_mp2(function(){
s.parentNode.removeChild(s);
dec=[];
lchannel = [];
rchannel = [];
r=[];
l=[];
buffer = xhr.mozResponseArrayBuffer;
buffer = xhr.response ? xhr.response : xhr.mozResponseArrayBuffer;
frame= new Uint8Array(buffer);
bytes_left = frame.length-100;
decode_mp2();
Expand Down Expand Up @@ -179,6 +188,22 @@ <h2>Demo:</h2>
};
}

if (!!(window.AudioContext || window.webkitAudioContext)) {
var context = new (window.AudioContext || window.webkitAudioContext)();
var sndbuffer = context.createBuffer(2, lchannel.length + rchannel.length, sampleRate);
sndbuffer.copyToChannel(new Float32Array(lchannel), 0, 0);
sndbuffer.copyToChannel(new Float32Array(rchannel), 1, 0);
var source = context.createBufferSource();
source.buffer = sndbuffer;
source.connect(context.destination);
var start=function() {
source.start(0);
}

var stop=function() {
source.stop(0);
};
} else {
var audioDestination = new AudioDataDestination(sampleRate, requestSoundData);
var start=function() {
currentSoundSample = 0;
Expand All @@ -189,6 +214,7 @@ <h2>Demo:</h2>
var stop=function() {
frequency = 0;
};
}
var start_button=document.createElement("button");
start_button.innerHTML="Start playback";
start_button.onclick=start;
Expand Down