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convert the buffer to mono

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replaces the existing buffer
This commit is contained in:
Yotam Mann 2017-02-19 11:52:04 -05:00
parent 4e5ff9d41d
commit b32f2606e7
1 changed files with 26 additions and 0 deletions
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26
Tone/core/Buffer.js
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@ -244,6 +244,32 @@ define(["Tone/core/Tone", "Tone/core/Emitter", "Tone/type/Type"], function(Tone)
return this; return this;
}; };
/**
* Sums muliple channels into 1 channel
* @param {Number=} channel Optionally only copy a single channel from the array.
* @return {Array}
*/
Tone.Buffer.prototype.toMono = function(chanNum){
if (this.isNumber(chanNum)){
this.fromArray(this.toArray(chanNum));
} else {
var outputArray = new Float32Array(this.length);
var numChannels = this.numberOfChannels;
for (var channel = 0; channel < numChannels; channel++){
var channelArray = this.toArray(channel);
for (var i = 0; i < channelArray.length; i++){
outputArray[i] += channelArray[i];
}
}
//divide by the number of channels
outputArray = outputArray.map(function(sample){
return sample / numChannels;
});
this.fromArray(outputArray);
}
return this;
};
/** /**
* Get the buffer as an array. Single channel buffers will return a 1-dimensional * Get the buffer as an array. Single channel buffers will return a 1-dimensional
* Float32Array, and multichannel buffers will return multidimensional arrays. * Float32Array, and multichannel buffers will return multidimensional arrays.