123 lines
2.9 KiB
Text
123 lines
2.9 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{RecordBuf}
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Record or overdub into a Buffer.@section{related}
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Classes/PlayBuf
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@section{categories}
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UGens>Buffer
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@section{description}
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Records input into a link::Classes/Buffer::.
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If recLevel is 1.0 and preLevel is 0.0 then the new input overwrites the
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old data. If they are both 1.0 then the new data is added to the existing
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data. (Any other settings are also valid.)
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@section{note}
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The number of channels must be fixed for the SynthDef, it cannot vary depending on which buffer you use. ::
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@section{classmethods}
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@section{method}
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ar, kr
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@section{argument}
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inputArray
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An Array of input channels.
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@section{argument}
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bufnum
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The index of the buffer to use.
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@section{argument}
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offset
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An offset into the buffer in samples.
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@section{argument}
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recLevel
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Value to multiply by input before mixing with existing data.
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@section{argument}
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preLevel
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Value to multiply to existing data in buffer before mixing with input.
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@section{argument}
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run
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If zero, then recording stops, otherwise recording proceeds.
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@section{argument}
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loop
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If zero then don't loop, otherwise do. This is modulatable.
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@section{argument}
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trigger
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a trigger causes a jump to the start of the Buffer. A trigger
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occurs when a signal changes from negative value to positive
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value.
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@section{argument}
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doneAction
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an integer representing an action to be executed when the buffer is finished recording. This can be used to free the enclosing synth, etc. See link::Classes/Done:: for more detail.
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@racketblock[doneAction:: is only evaluated if loop is 0.
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]
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@section{Examples}
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@racketblock[
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// Execute the following in order
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(
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// allocate a Buffer
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s = Server.local;
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b = Buffer.alloc(s, 44100 * 4.0, 1); // a four second 1 channel Buffer
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)
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// record for four seconds
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(
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SynthDef(\help_RecordBuf, { arg out = 0, bufnum = 0;
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var formant;
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formant = Formant.ar(XLine.kr(400,1000, 4), 2000, 800, 0.125);
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RecordBuf.ar(formant, bufnum, doneAction: Done.freeSelf, loop: 0);
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}).play(s,[\out, 0, \bufnum, b]);
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)
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// play it back
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(
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SynthDef(\help_RecordBuf_playback, { arg out = 0, bufnum = 0;
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var playbuf;
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playbuf = PlayBuf.ar(1,bufnum);
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FreeSelfWhenDone.kr(playbuf); // frees the synth when the PlayBuf is finished
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Out.ar(out, playbuf);
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}).play(s, [\out, 0, \bufnum, b]);
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)
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// overdub
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(
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SynthDef(\help_RecordBuf_overdub, { arg out=0, bufnum=0;
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var formant;
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formant = Formant.ar(XLine.kr(200, 1000, 4), 2000, 800, 0.125);
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// mixes equally with existing data
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RecordBuf.ar(formant, bufnum, 0, 0.3, 0.5, doneAction: Done.freeSelf, loop: 0);
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}).play(s, [\out, 0, \bufnum, b]);
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)
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// play back the overdubbed version
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Synth.new(\help_RecordBuf_playback, [\out, 0, \bufnum, b], s);
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// write the contents of the buffer to a file (see Buffer for more options)
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(
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b.write(sampleFormat: 'int16');
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thisProcess.platform.recordingsDir +/+ "SC_" ++ Date.localtime.stamp ++ ".aiff"; // generated path
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)
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b.close; b.free; // cleanup
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::
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]
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