95 lines
2.6 KiB
Plaintext
95 lines
2.6 KiB
Plaintext
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//-----------------------------------------------------------------------------
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// name: LiSa
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// desc: Live sampling utilities for ChucK
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//
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// author: Dan Trueman, 2007
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//
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// to run (in command line chuck):
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// %> chuck LiSa_readme.ck
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//-----------------------------------------------------------------------------
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/*
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LiSa allows for multiple voice playback from a live-sampled buffer. Useful
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for granular sampling (a la [munger~] from PeRColate) and looping (a la LoopLoop,
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Jamman, Echoplex, etc....). The methods are overloaded, taking a "voice" number
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as a first arg. if no voice number is specified, LiSa assumes 0=>voice.
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Below is a simple example to show how to crossfade two voices. See also the
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LiSa_munger directory for other approaches.
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Below the example find a (lengthy) command summary.
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*/
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//-----------------------------------------------------------------------------
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//signal chain; record a sine wave, play it back
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SinOsc s => Envelope e => LiSa loopme => dac;
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s => dac;
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440. => s.freq;
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0.2 => s.gain;
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//alloc memory
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6::second => loopme.duration;
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//play s for a bit
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500::ms => now;
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//sweep the freq for fun
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Envelope pitchmod => blackhole;
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pitchmod.duration(2000::ms);
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pitchmod.value(s.freq());
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pitchmod.target(880.);
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//confirm that the length of the buffer is what you expect
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<<<"buffer duration = ", loopme.duration() / 44100.>>>;
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//set times for recording fade in/out and sample loop length
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100::ms => dur recfadetime;
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1000::ms => dur mylooplen;
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e.duration(recfadetime);
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//start recording input; record 1 seconds worth
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loopme.record(1);
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e.keyOn(); //can also do without the Envelope and use loopme.recramp(dur) to set a recording ramp
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now + (mylooplen - recfadetime) => time later;
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while(now < later) {
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pitchmod.value() => s.freq;
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10::ms => now;
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}
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e.keyOff();
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recfadetime => now;
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loopme.record(0);
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//disconnect input and hangout a bit
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s =< dac;
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1000::ms => now;
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//now, manipulate the sample
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// get a voicenumber; note that this voice won't actually be reserved until you play it
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loopme.getVoice() => int voice1;
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//we'll play voice 1 forward, and then crossfade it with voice 2 backwards
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loopme.play(voice1, 1);
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(mylooplen - recfadetime) => now;
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//just as voice 1 is going to fade, bring in voice 2
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loopme.getVoice() => int voice2;
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loopme.rate(voice2, -1.);
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loopme.playPos(voice2, mylooplen);
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loopme.voiceGain(voice2, 0.2);
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loopme.play(voice2, 1);
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//wait until voice 1 had finished fading, then turn off
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recfadetime => now;
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loopme.play(voice1, 0);
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//wait for voice 2 to finish
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1000::ms => now;
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//-----------------------------------------------------------------------------
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