IN

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in, ins, inq, soundin, diskin, out, outs1, outs2, outs, outq1, outq2, outq3, outq4, outq

  a1               in
  a1, a2           ins
  a1, a2, a3, a4   inq
  a1               soundin  ifil[, iskip][, iformat]
  a1, a2           soundin  ifil[, iskip][, iformat]
  a1, a2, a3, a4   soundin  ifil[, iskip][, iformat]     
  a1[,a2[,a3,a4]]  diskin   ifil, kpitch[,iskip][,iwrap][,iformat]
                   out      asig
                   outs1    asig
                   outs2    asig
                   outs     asig1, asig2
                   outq1    asig
                   outq2    asig
                   outq3    asig
                   outq4    asig
                   outq     asig1, asig2, asig3, asig4

DESCRIPTION

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

INITIALIZATION

ifil - 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.
iskip (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. The default value is 0.
kpitch - can be any real number taken as a ratio. A negative number signifies backwards playback:

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

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

PERFORMANCE

in, ins, inq - copy the current values from the standard audio input buffer. If the command-line flag -i is set, sound is read continuously from the audio input stream (e.g. stdin 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.

out, outs, outq send audio samples to an accumulating output buffer (created at the beginning of performance) which serves to collect the output of all active instruments before the sound is written to disk. There can be any number of these output units in an instrument. The type (mono, stereo, or quad) must agree with nchnls, but units can be chosen to direct sound to any particular channel: outs1 sends to stereo channel 1, outq3 to quad channel 3, etc.

AUTHOR:

Barry Vercoe, Matt Ingalls/Myike Berry
1993-1997

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