PV_RecordBuf stores FFT data to a buffer for use by a number of PV UGens. See also PV_RecordBuf, PV_PlayBuf, PV_BinPlayBuf and PV_BufRd.
buffer |
The FFT buffer to fill data into. |
playbuf |
The buffer to read frames of FFT data from. |
rate | |
offset | |
binStart |
See below. |
binSkip |
See below. |
numBins |
See below. |
loop | |
clear |
All values for these parameters are truncated to integers when used by the UGens (you can't start an bin 1.5 or skip 2.3).
// anazlyze a soundfile and store its data to a buffer
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, playbuf, clear = 0.0;
var in, chain, bufnum;
bufnum = LocalBuf.new(1024);
chain = FFT(bufnum, PlayBuf.ar(1, playbuf, BufRateScale.kr(playbuf), loop: 1));
// MouseX points into file. start at bin 10, skip 3, resynth 50
chain = PV_BinBufRd(chain, recBuf, MouseX.kr(0, 1), 10, 3, 5, clear);
Out.ar(out, IFFT(chain, 1).dup);
}).add;
);
// mix the resynth and data from the recBuf
b = Synth("pvplay", [\out, 0, \recBuf, y, \playbuf, z, \clear, 0.0]);
b.free;
// zero out the data in the FFT buf that ins't read in from recBuf
b = Synth("pvplay", [\out, 0, \bufnum, x, \recBuf, y, \playbuf, z, \clear, 1.0]);
// stop the synth
b.free;
// play your analysis back ... use multiple PV_BinBufRd ugens.
(
SynthDef("pvplay", { arg out=0, recBuf=1, playbuf, clear = 0.0;
var in, chain, bufnum;
bufnum = LocalBuf.new(1024);
chain = FFT(bufnum, PlayBuf.ar(1, playbuf, BufRateScale.kr(playbuf), loop: 1));
// MouseX points into file. start at bin 10, skip 3, resynth 50
chain = PV_BinBufRd(chain, recBuf, MouseX.kr(0, 1), 10, 3, 50, clear);
chain = PV_BinBufRd(chain, recBuf, MouseX.kr(0.1, 0.9), 10, 3, 50, 0.0);
Out.ar(out, IFFT(chain, 1).dup);
}).add;
);
// mix the resynth and data from the recBuf
b = Synth("pvplay", [\out, 0, \recBuf, y, \playbuf, z, \clear, 0.0]);
b.free;
// zero out the data in the FFT buf that ins't read in from recBuf
b = Synth("pvplay", [\out, 0, \bufnum, x, \recBuf, y, \playbuf, z, \clear, 1.0]);
// stop the synth
b.free;
// free the buffers
[y, z].do({arg me; me.free});