diskin
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diskin

diskin — Reads audio data from an external device or stream and can alter its pitch.

Description

Reads audio data from an external device or stream and can alter its pitch.

Syntax

ar1 [, ar2 [, ar3 [, ... ar24]]] diskin ifilcod, kpitch [, iskiptim] \
      [, iwraparound] [, iformat] [, iskipinit]

Initialization

ifilcod -- integer or character-string denoting the source soundfile name. An integer denotes the file soundin.filcod ; a character-string (in double quotes, spaces permitted) gives the filename itself, optionally a full pathname. If not a full path, the named file is sought first in the current directory, then in that given by the environment variable SSDIR (if defined) then by SFDIR. See also GEN01.

iskptim (optional) -- time in seconds of input sound to be skipped. The default value is 0.

iformat (optional) -- specifies the audio data file format:

  • 1 = 8-bit signed char (high-order 8 bits of a 16-bit integer)

  • 2 = 8-bit A-law bytes

  • 3 = 8-bit U-law bytes

  • 4 = 16-bit short integers

  • 5 = 32-bit long integers

  • 6 = 32-bit floats

  • 7 = 8-bit unsigned int (not available in Csound versions older than 5.00)

  • 8 = 24-bit int (not available in Csound versions older than 5.00)

  • 9 = 64-bit doubles (not available in Csound versions older than 5.00)

iwraparound -- 1 = on, 0 = off (wraps around to end of file either direction)

iskipinit switches off all initialisation if non zero (default =0). This was introduced in 4_23f13 and csound5.

If iformat = 0 it is taken from the soundfile header, and if no header from the Csound -o command-line flag. The default value is 0.

Performance

kpitch -- can be any real number. a negative number signifies backwards playback. The given number is a pitch ratio, where:

  • 1 = normal pitch

  • 2 = 1 octave higher

  • 3 = 12th higher, etc.

  • .5 = 1 octave lower

  • .25 = 2 octaves lower, etc.

  • -1 = normal pitch backwards

  • -2 = 1 octave higher backwards, etc.

diskin is identical to soundin except that it can alter the pitch of the sound that is being read.

[Caution] Note to Windows users

Windows users typically use back-slashes, “\”, when specifying the paths of their files. As an example, a Windows user might use the path “c:\music\samples\loop001.wav”. This is problematic because back-slashes are normally used to specify special characters.

To correctly specify this path in Csound, one may alternately:

  • Use forward slashes: c:/music/samples/loop001.wav

  • Use back-slash special characters, “\\”: c:\\music\\samples\\loop001.wav

Examples

Here is an example of the diskin opcode. It uses the file diskin.csd, beats.wav.

Example 116. Example of the diskin 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
; Audio out   Audio in    No messages
-odac           -iadc     -d     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o diskin.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
kr = 44100
ksmps = 1
nchnls = 1

; Instrument #1 - play an audio file.
instr 1
  ; Play the audio file backwards.
  asig diskin "beats.wav", -1
  out asig
endin


</CsInstruments>
<CsScore>

; Play Instrument #1, the audio file, for three seconds.
i 1 0 3
e


</CsScore>
</CsoundSynthesizer>


See Also

in, inh, ino, inq, ins, soundin and diskin2

Credits

Authors: Barry L. Vercoe, Matt Ingalls/Mike Berry
MIT, Mills College
1993-1997

New in versin 3.46

Example written by Kevin Conder.

Warning to Windows users added by Kevin Conder, April 2002

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