123 lines
2.8 KiB
Text
123 lines
2.8 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Warp1}
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Warp a buffer with a time pointer@section{categories}
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UGens>Buffer, UGens>Generators>Granular
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@section{description}
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Inspired by Chad Kirby's SuperCollider2 Warp1 class, which was inspired by Richard Karpen's sndwarp for CSound. A granular time stretcher and pitchshifter.
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@section{classmethods}
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@section{private}
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categories
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@section{method}
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ar
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@section{argument}
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numChannels
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the number of channels in the soundfile used in bufnum.
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@section{argument}
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bufnum
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the buffer number of a mono soundfile.
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@section{argument}
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pointer
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the position in the buffer. The value should be between 0 and 1, with 0 being the beginning
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of the buffer, and 1 the end.
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@section{argument}
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freqScale
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the amount of frequency shift. 1.0 is normal, 0.5 is one octave down, 2.0 is one octave up.
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Negative values play the soundfile backwards.
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@section{argument}
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windowSize
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the size of each grain window.
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@section{argument}
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envbufnum
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the buffer number containing a signal to use for the grain envelope. -1 uses a built-in
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Hanning envelope.
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@section{argument}
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overlaps
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the number of overlapping windows.
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@section{argument}
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windowRandRatio
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the amount of randomness to the windowing function. Must be between 0 (no
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randomness) to 1.0 (probably too random actually)
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@section{argument}
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interp
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the interpolation method used for pitchshifting grains. 1 = no interpolation. 2 = linear.
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4 = cubic interpolation (more computationally intensive).
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@section{argument}
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mul
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@section{argument}
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add
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@section{Examples}
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@racketblock[
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s.boot;
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(
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var winenv;
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// a custom envelope - not a very good one, but you can hear the difference between this
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// and the default
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winenv = Env([0, 1, 0], [0.5, 0.5], [8, -8]);
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b = Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01-44_1.aiff");
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z = Buffer.sendCollection(s, winenv.discretize, 1);
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SynthDef(\warp, {arg buffer = 0, envbuf = -1;
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var out, pointer, filelength, pitch, env, dir;
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// pointer - move from beginning to end of soundfile over 15 seconds
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pointer = Line.kr(0, 1, 15);
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// control pitch with MouseX
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pitch = MouseX.kr(0.5, 2);
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env = EnvGen.kr(Env([0.001, 1, 1, 0.001], [0.1, 14, 0.9], 'exp'), doneAction: Done.freeSelf);
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out = Warp1.ar(1, buffer, pointer, pitch, 0.1, envbuf, 8, 0.1, 2);
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Out.ar(0, out * env);
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}).add;
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)
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// use built-in env
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x = Synth(\warp, [\buffer, b, \envbuf, -1])
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// switch to the custom env
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x.set(\envbuf, z)
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x.set(\envbuf, -1);
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x.free;
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::
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]
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@racketblock[
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(
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b.free;
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b= Buffer.read(s, Platform.resourceDir +/+ "sounds/a11wlk01-44_1.aiff");
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SynthDef(\warp2, {|buffer|
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var pointer = Phasor.ar(0, SampleDur.ir/BufDur.ir(buffer)*XLine.kr(1, 0.25, 20));
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var out = Warp1.ar(1, buffer, pointer, 1, 0.3, -1, 16, Line.kr(0, 1, 40), 4);
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Out.ar(0, Pan2.ar(out, pointer*2-1, 0.25));
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}).add;
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)
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x = Synth(\warp2, [\buffer, b])
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x.free
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b.free
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::
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]
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