PV_BufRd | SuperCollider 3.13.0 Help

Description

PV_BufRd will play back FFT data stored to a buffer with PV_RecordBuf.

WARNING: Resynth of a FFTs with large window sizes may cause CPU spikes.

PV_RecordBuf stores FFT data to a buffer for use by a number of PV UGens.

Class Methods

.new

Arguments:

buffer	The FFT buffer to fill data into
playbuf	The buffer to read frames of FFT data fram.
point	A value between 0.0 and 1.0. 0.0 is the beginning of the file, 1.0 the end. Values greater then 1.0 or less then 0.0 are wrapped into this range.

Examples

// anazlyze a soundfile and store its data to a buffer

s = Server.local;
s.boot;

(
var sf;
// path to a sound file here
p = Platform.resourceDir +/+ "sounds/a11wlk01.wav";
// the frame size for the analysis - experiment with other sizes (powers of 2)
f = 1024;
// the hop size
h = 0.25;
// get some info about the file
sf = SoundFile.new( p );
sf.openRead;
sf.close;
// allocate memory to store FFT data to... SimpleNumber.calcPVRecSize(frameSize, hop) will return
// the appropriate number of samples needed for the buffer
y = Buffer.alloc(s, sf.duration.calcPVRecSize(f, h));
// allocate the soundfile you want to analyze
z = Buffer.read(s, p);
)

// this does the analysis and saves it to buffer 1... frees itself when done
(
SynthDef("pvrec", { arg recBuf=1, soundBufnum=2;
    var in, chain, bufnum;
    bufnum = LocalBuf.new(1024);
    Line.kr(1, 1, BufDur.kr(soundBufnum), doneAction: 2);
    in = PlayBuf.ar(1, soundBufnum, BufRateScale.kr(soundBufnum), loop: 0);
    // note the window type and overlaps... this is important for resynth parameters
    chain = FFT(bufnum, in, 0.25, 1);
    chain = PV_RecordBuf(chain, recBuf, 0, 1, 0, 0.25, 1);
    // no ouput ... simply save the analysis to recBuf
    }).add;
)
a = Synth("pvrec", [\recBuf, y, \soundBufnum, z]);

// you can save your 'analysis' file to disk! I suggest using float32 for the format
// These can be read back in using Buffer.read

y.write(p++".scpv", "wav", "float32");

// play your analysis back ... see the playback UGens listed above for more examples.
(
SynthDef("pvplay", { arg out=0, recBuf=1;
    var in, chain, bufnum;
    bufnum = LocalBuf.new(1024);
    chain = PV_BufRd(bufnum, recBuf, MouseX.kr(0.0, 1.0));
    Out.ar(out, IFFT(chain, 1).dup);
    }).add;
);
b = Synth("pvplay", [\out, 0, \bufnum, x, \recBuf, y]);

// stop the synth
b.free;

helpfile source: source/JoshUGens/sc/HelpSource/Classes/PV_BufRd.schelp
link::sc3-plugins/Classes/PV_BufRd::

PV_BufRdExtension

Description

Class Methods

.new

Arguments:

Examples

PV_BufRd
Extension