in, ins, inq, inh, ino, soundin, diskin

  a1                              in
  a1, a2                          ins
  a1, a2,  a3, a4                 inq
  a3, a4
  a1, a2, a3, a4, a5, a6          inh
  a1, a2,  a3, a4, a5, a6, a7, a8 ino
  
  a1                              soundin   ifilcod[, iskptim[, iformat]]
  a1, a2                          soundin   ifilcod[, iskptim[, iformat]]
  a1, a2, a3, a4                  soundin   ifilcod[, iskptim[, iformat]]
  a3, a4
  
  a1[,a2[, a3,a4]]                diskin    ifilcod, kpitch[, iskiptim[, iwraparound[, iformat]]]

Description

These units read audio data from an external device or stream.

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

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

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

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

	1   =  norm pitch
	2   =  oct higher
	3   =  12th higher, etc.
	.5  =  oct lower
	.25 =  2oct lower, etc.
	-1  =  norm pitch backwards
	-2  =  oct higher backwards, etc.

Performance

in, ins, inq, inh, ino - copy the current values from the standard audio input buffer. If the command-line -i flag is set, sound is read continuously from the audio input stream (e.g. stdain or a soundfile) into an internal buffer. Any number of these units can read freely from this buffer.

soundin is functionally an audio generator that derives its signal from a pre-existing file. The number of channels read in is controlled by the number of result cells, a1, a2, etc., which must match that of the input file. A soundin unit opens this file whenever the host instrument is initialized, then closes it again each time the instrument is turned off. There can be any number of soundin units within a single instrument or orchestra; also, two or more of them can read simultaneously from the same external file.

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

Authors

Barry Vercoe, Matt Ingalls/Mike Berry
MIT, Mills College
1993-1997