dumpk4
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## dumpk4

dumpk4 — Periodically writes four orchestra control-signal values to an external file.

## Description

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 257. Example of the dumpk4 opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <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

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