Skip to content

dumpk4

Periodically writes four orchestra control-signal values to a named external file in a specific format.

Syntax

dumpk4 ksig1, ksig2, ksig3, ksig4, ifilname, iformat, iprd

Initialization

ifilname -- character string (in double quotes, spaces permitted) denoting the external file name. May either be a full path name with target directory specified or a simple filename to be created within the current directory

iformat -- specifies the output data format:

  • 1 = 8-bit signed char (high order 8 bits of a 16-bit integer)
  • 4 = 16-bit short integers
  • 5 = 32-bit long integers
  • 6 = 32-bit floats
  • 7 = ASCII long integers
  • 8 = ASCII floats (2 decimal places)

Note that A-law and U-law output are not available, and that all formats except the last two are binary. The output file contains no header information.

iprd -- the period of ksig output in seconds, rounded to the nearest orchestra control period. A value of 0 implies one control period (the enforced minimum), which will create an output file sampled at the orchestra control rate.

Performance

ksig1, ksig2, ksig3, ksig4 -- control-rate signals

This opcode allows four generated control signal values to be saved in a named external file. The file contains no self-defining header information. But it contains a regularly sampled time series, suitable for later input or analysis. There may be any number of dumpk4 opcodes in an instrument or orchestra but each must write to a different file.

Examples

Here is an example of the dumpk4 opcode. It uses the file dumpk4.csd. Note that the example must be run from a directory for which the user has write access.

Example of the dumpk4 opcode.
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac      ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o dumpk4.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

giSine ftgen 0, 0, 2^10, 10, 1

instr 1 ;writes four control signals to a file
kcf       randh     950, 1, 2, 1, 1050 ;generates one random number between 100 and 2000 per second
kq        randh     10, 1, 2, 1, 11 ;generates another random number between 1 and 21 per second
kdb       randh     9, 1, 2, 1, -15 ;amplitudes in dB between -24 and -6
kpan      randh     .5, 1, 2, 1, .5 ;panning between 0 and 1
          dumpk4    kcf, kq, kdb, kpan, "dumpk4.txt", 8, 1 ;writes the control signals
          prints    "WRITING:\n"
          printks   "kcf = %f, kq = %f, kdb = %f, kpan = %f\n", 1, kcf, kq, kdb, kpan  ;prints them
endin

instr 2 ;reads the file written by instr 1
kcf,kq,kdb,kp readk4 "dumpk4.txt", 8, 1
          prints    "READING:\n"
          printks   "kcf = %f, kq = %f, kdb = %f, kpan = %f\n", 1, kcf, kq, kdb, kp  ;prints values
kdb       lineto    kdb, .1 ;smoothing amp transition
kp        lineto    kp, .1 ;smoothing pan transition
anoise    rand      ampdb(kdb), 2, 1
kbw       =         kcf/kq ;bandwidth of resonant filter
abp       reson     anoise, kcf, kbw
aout      balance   abp, anoise
aL, aR    pan2      aout, kp
          outs      aL, aR
endin

</CsInstruments>
<CsScore>
i 1 0 5
i 2 5 5
e
</CsScore>
</CsoundSynthesizer>

The output should include lines like these:

WRITING:
kcf = 1122.469723, kq = 11.762839, kdb = -14.313445, kpan = 0.538142
kcf = 1122.469723, kq = 11.762839, kdb = -14.313445, kpan = 0.538142
kcf = 1148.638412, kq = 12.040490, kdb = -14.061868, kpan = 0.552205
kcf = 165.796855, kq = 18.523179, kdb = -15.816977, kpan = 0.901528
kcf = 147.729960, kq = 13.071911, kdb = -11.924531, kpan = 0.982518
kcf = 497.430113, kq = 13.605512, kdb = -21.586611, kpan = 0.179229

READING:
WARNING: Seeding from current time 3308160476

kcf = 1122.469700, kq = 11.762800, kdb = -14.313400, kpan = 0.538100
kcf = 1122.469700, kq = 11.762800, kdb = -14.313400, kpan = 0.538100
kcf = 1148.638400, kq = 12.040500, kdb = -14.061900, kpan = 0.552200
kcf = 165.796900, kq = 18.523200, kdb = -15.817000, kpan = 0.901500
kcf = 147.730000, kq = 13.071900, kdb = -11.924500, kpan = 0.982500
kcf = 497.430100, kq = 13.605500, kdb = -21.586600, kpan = 0.179200

See also

File Input and Output

Credits

By: John ffitch and Barry L. Vercoe

1999 or earlier