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TestPitchShift.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
</head>
<!--
The MIT License (MIT)
Copyright (c) <2015> <Juan Carlos Martinez>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-->
<body>
<script src="earsketch-dsp.js"></script>
<script type="text/javascript">
var context;
var buffer;
var AudioData;
var NumberOfSamples=0;
var WINDOW_SIZE = 1024;
var HOP_SIZE = 256;
var FRAMES=0;
var OUTSAMPLES=0;
var INTERSAMPLES=0;
//var WINDOW_SIZE = 32;
//var HOP_SIZE = 8;
//HEAP VARIABLES
var WW_HEAP;
var HH_HEAP;
var LASTPH_HEAP;
var ACCUMPH_HEAP;
var MAGFREQ_HEAP;
var YOVERLAP_HEAP;
var YINTERP_HEAP;
var YHOPOUT_HEAP;
function loadClick() {
console.log('Testing Ptcht Shift Time');
context = new (window.AudioContext || window.webkitAudioContext)();
var req = new XMLHttpRequest();
//req.open("GET","esaudioshort.wav");
req.open("GET","esaudioshort.wav");
req.responseType = "arraybuffer";
req.onload = function() {
//decode the loaded data
context.decodeAudioData(req.response, function(buf ){
buffer=buf;
AudioData = buffer.getChannelData(0);
console.log('LOADED... ' + AudioData.length);
});
};
req.send();
}
function playClick() {
console.log('playClick... ' + AudioData.length);
//create a source node from the buffer
var src = context.createBufferSource();
src.buffer = buffer;
//connect to the final output node (the speakers)
src.connect(context.destination);
//play immediately
src.start();
}
function playPitchShiftClick() {
console.log('Play PITCHSHIFT BUFFER !!!' );
var audiobuffer = context.createBuffer(1, INTERSAMPLES, context.sampleRate);
var pcmChannel = audiobuffer.getChannelData(0);
var ytemp = YINTERP_HEAP.subarray(0,INTERSAMPLES);
pcmChannel.set(ytemp);
//psArrayBuffer.copyToChannel(YINTERP_HEAP,0,0);
//play immediately
var src = context.createBufferSource();
src.buffer = audiobuffer;
//connect to the final output node (the speakers)
src.connect(context.destination);
//play immediately
src.start();
}
//void windowSignalQ(float ww[],float xx[], int N, float factor);
//void overlapadd(float xin[],float yoverlap[], int offset,int N);
//void interpolateFit(float yvals[],float outvals[], int N,int NOUT, float inc);
//void interpolateFitVar(float yvals[],float outvals[], int hops[], int N,int NOUT, int FRAMES , int HOPSOURCE)
function setupCWrappers(){
initDSP = Module.cwrap('initDSP', 'number');
fillHann = Module.cwrap('fillHann', 'number', ['number','number']);
windowSignal = Module.cwrap('windowSignal', 'number', ['number','number','number']);
windowSignalQ = Module.cwrap('windowSignalQ', 'number', ['number','number','number','number']);
rfft = Module.cwrap('rfft', 'number', ['number','number','number']);
convert = Module.cwrap('convert', 'number', ['number','number','number','number','number']);
unconvert = Module.cwrap('unconvert', 'number', ['number','number','number','number','number']);
overlapadd = Module.cwrap('overlapadd', 'number', ['number','number','number','number']);
interpolateFit = Module.cwrap('interpolateFit', 'number', ['number','number','number','number','number']);
interpolateFitVar = Module.cwrap('interpolateFitVar', 'number', ['number','number','number', 'number','number','number', 'number']);
}
function setupHeap(){
//yoverlap = (float *)calloc(outSamples , sizeof(float));
//yinterp = (float *)calloc(interSamples,sizeof(float));
//TODO:REVIEW EMSCRIPTEN HEAP FOR OVERLAP AND INTERPOLATION EXTENDS TOTAL MEMORY
//IN THE HEAP OR USE STANDARD FLOAT ARRAY AND USE THE COPY FUNCTION
var nDataBytes = WINDOW_SIZE * Float32Array.BYTES_PER_ELEMENT;
var hhPtr = Module._malloc(nDataBytes);
HH_HEAP = new Float32Array(Module.HEAPF32.buffer, hhPtr, WINDOW_SIZE);
var wwPtr = Module._malloc(nDataBytes);
WW_HEAP = new Float32Array(Module.HEAPF32.buffer, wwPtr, WINDOW_SIZE);
nDataBytes = (WINDOW_SIZE/2 +1) * Float32Array.BYTES_PER_ELEMENT;
var lastphPtr = Module._malloc(nDataBytes);
LASTPH_HEAP = new Float32Array(Module.HEAPF32.buffer, lastphPtr, WINDOW_SIZE/2 +1);
nDataBytes = (WINDOW_SIZE + 2) * Float32Array.BYTES_PER_ELEMENT;
var magfreqPtr = Module._malloc(nDataBytes);
MAGFREQ_HEAP = new Float32Array(Module.HEAPF32.buffer, magfreqPtr, WINDOW_SIZE + 2);
nDataBytes = (WINDOW_SIZE/2 +1) * Float32Array.BYTES_PER_ELEMENT;
var accumphPtr = Module._malloc(nDataBytes);
ACCUMPH_HEAP = new Float32Array(Module.HEAPF32.buffer, accumphPtr, WINDOW_SIZE/2 +1);
nDataBytes = (OUTSAMPLES) * Float32Array.BYTES_PER_ELEMENT;
var yoverlapPtr = Module._malloc(nDataBytes);
YOVERLAP_HEAP = new Float32Array(Module.HEAPF32.buffer, yoverlapPtr, OUTSAMPLES);
nDataBytes = (INTERSAMPLES) * Float32Array.BYTES_PER_ELEMENT;
var yinterpPtr = Module._malloc(nDataBytes);
YINTERP_HEAP = new Float32Array(Module.HEAPF32.buffer, yinterpPtr, INTERSAMPLES);
//yhopout = (int *)calloc(frames , sizeof(int));
//YHOPOUT_HEAP
nDataBytes = (FRAMES) * Int32Array.BYTES_PER_ELEMENT;
var yhopoutPtr = Module._malloc(nDataBytes);
YHOPOUT_HEAP = new Int32Array(Module.HEAP32.buffer, yhopoutPtr, FRAMES);
}
function initDSPLibrary(){
console.log('initDSPLibrary... ');
setupCWrappers();
setupHeap();
initDSP();
fillHann(HH_HEAP.byteOffset,WINDOW_SIZE);
}
function freeHeap(){
Module._free(HH_HEAP.byteOffset);
Module._free(WW_HEAP.byteOffset);
Module._free(LASTPH_HEAP.byteOffset);
Module._free(MAGFREQ_HEAP.byteOffset);
Module._free(ACCUMPH_HEAP.byteOffset);
Module._free(YOVERLAP_HEAP.byteOffset);
Module._free(YINTERP_HEAP.byteOffset);
Module._free(YHOPOUT_HEAP.byteOffset);
}
function testClick() {
console.log('Starting Test ... ');
//WINDOW_SIZE = 8;
initDSPLibrary();
WW_HEAP.set([0,1,2,3,4,5,6,7]);
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 1);
console.log('FFT at X[0] = ' + (WINDOW_SIZE*WW_HEAP[0]) + ' +0 i');
for(i=1;i<8/2;++i){
console.log('FFT at X[k] = ' + (WINDOW_SIZE*WW_HEAP[2*i]) + ' '+ (-1*WINDOW_SIZE*WW_HEAP[2*i+1]) + ' i');
}
console.log('FFT at X[N/2] = ' + (WINDOW_SIZE*WW_HEAP[1]) + ' +0 i');
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 0);
for(i=0;i<8; i++){
console.log('IFFT at x[i] =' + WW_HEAP[i]);
}
freeHeap();
console.log('Done ... ');
}
function testPVClick() {
//
// FOR TESTING SET WINDOW SIZE = 32 AND HOP SIZE=8
//
console.log('Starting Test ... ');
//WINDOW_SIZE = 8;
initDSPLibrary();
for (n =0; n <WINDOW_SIZE; n++) {
WW_HEAP[n] = Math.cos(2.0*Math.PI*n/3.0);
};
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 1);
console.log('FFT at X[0] = ' + (WINDOW_SIZE*WW_HEAP[0]) + ' +0 i');
for(i=1;i<8/2;++i){
console.log('FFT at X[k] = ' + (WINDOW_SIZE*WW_HEAP[2*i]) + ' '+ (-1*WINDOW_SIZE*WW_HEAP[2*i+1]) + ' i');
}
console.log('FFT at X[N/2] = ' + (WINDOW_SIZE*WW_HEAP[1]) + ' +0 i');
convert( WW_HEAP.byteOffset, MAGFREQ_HEAP.byteOffset, WINDOW_SIZE/2, HOP_SIZE,LASTPH_HEAP.byteOffset);
for(i=0;i<WINDOW_SIZE/2;++i){
console.log('MAG[N] = ' + (WINDOW_SIZE*MAGFREQ_HEAP[i*2] ) );
}
for(i=0;i<WINDOW_SIZE/2;++i){
console.log('FREQ[N] = '+ MAGFREQ_HEAP[i*2+1]);
}
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 0);
for(i=0;i<8; i++){
console.log('IFFT at x[i] =' + WW_HEAP[i]);
}
freeHeap();
console.log('Done ... ');
}
function setOutSample(){
var minStep, maxStep , step,alpha , hopOut;
minStep = -2.0;
maxStep = 2.0;
for (f=0; f<FRAMES; ++f) {
step = -2.0 + (4.0*f/FRAMES);
alpha = Math.pow (2.0, step/12.0);
hopOut = Math.round(alpha*HOP_SIZE);
OUTSAMPLES = OUTSAMPLES + hopOut;
}
OUTSAMPLES = OUTSAMPLES +WINDOW_SIZE - hopOut;
}
function setVariableShift(){
var minStep, maxStep , step,alpha , hopOut;
minStep = -2.0;
maxStep = 2.0;
for (f=0; f<FRAMES; ++f) {
step = -2.0 + (4.0*f/FRAMES);
alpha = Math.pow (2.0, step/12.0);
hopOut = Math.round(alpha*HOP_SIZE);
YHOPOUT_HEAP[f] = hopOut;
}
}
function stftClick() {
console.log('WINDOW_SIZE '+ WINDOW_SIZE + ' HOP SIZE '+HOP_SIZE);
console.log('Buffer Samples '+ AudioData.length );
var preMS = Date.now();
NumberOfSamples = AudioData.length ;
FRAMES = 1+ Math.floor( (NumberOfSamples-WINDOW_SIZE) / HOP_SIZE );
setOutSample();
INTERSAMPLES = NumberOfSamples;//Math.floor(OUTSAMPLES/alpha);
initDSPLibrary();
setVariableShift();
console.log('Buffer Frames '+ FRAMES );
console.log('OUTSAMPLES ' + OUTSAMPLES);
console.log('INTERSAMPLES ' + INTERSAMPLES);
var QWindow;// = 1.0 / Math.sqrt(((WINDOW_SIZE/HOPOUT)/2.0));
//console.log('QWindow ' + QWindow);
var index = 0;
var offset = 0;
for (f=0; f<FRAMES; ++f) {
//Nota that subarray is a pointer to the AudioData not a new array
//WW.set(AudioData.subarray(index,index+WINDOW_SIZE));
QWindow = 1.0 / Math.sqrt(((WINDOW_SIZE/YHOPOUT_HEAP[f])/2.0));
WW_HEAP.set(AudioData.subarray(index,index+WINDOW_SIZE));
//HANNING WINDOW
windowSignal(HH_HEAP.byteOffset,WW_HEAP.byteOffset, WINDOW_SIZE);
//FORWARD REAL FFT
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 1);
//COMPUTING INSTANTANEOS FREQUENCY
convert( WW_HEAP.byteOffset, MAGFREQ_HEAP.byteOffset, WINDOW_SIZE/2, HOP_SIZE,LASTPH_HEAP.byteOffset);
//COMPUTE COMPLEX FFT FROM INSTANTANEOUS FREQUENCY
unconvert( MAGFREQ_HEAP.byteOffset, WW_HEAP.byteOffset, WINDOW_SIZE/2, YHOPOUT_HEAP[f], ACCUMPH_HEAP.byteOffset);
//INVERSE FFT
rfft(WW_HEAP.byteOffset, WINDOW_SIZE/2, 0);
//WEIGTHED HANNING WINDOW
windowSignalQ(HH_HEAP.byteOffset,WW_HEAP.byteOffset, WINDOW_SIZE, QWindow);
index = index +HOP_SIZE;
overlapadd(WW_HEAP.byteOffset,YOVERLAP_HEAP.byteOffset, offset, WINDOW_SIZE);
offset = offset + YHOPOUT_HEAP[f];
}
console.log('Interpolation ...');
interpolateFitVar(YOVERLAP_HEAP.byteOffset,YINTERP_HEAP.byteOffset, YHOPOUT_HEAP.byteOffset, OUTSAMPLES,INTERSAMPLES, FRAMES ,HOP_SIZE);
var postMS = Date.now();
console.log('after DSP Done !!! in ' + (postMS-preMS) + ' ms');
//freeHeap();
}
</script>
<button type="button" onclick="loadClick();">Load Buffer!</button>
<button type="button" onclick="playClick();">Play Buffer!</button>
<button type="button" onclick="stftClick();">PITCHSHIFT!</button>
<button type="button" onclick="playPitchShiftClick();">PLAY PITCHSHIFT!</button>
</body>
</html>