86 lines
2.5 KiB
Text
86 lines
2.5 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{/b_gen Call a command to fill a buffer}
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int - buffer number
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string - command name
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.. command arguments
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Plug-ins can define commands that operate on buffers. The arguments
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after the command name are defined by the command. The currently
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defined buffer fill commands are listed below in a separate section.
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Buffer Fill Commands
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These are the currently defined fill routines for use with the
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/b_gen command.
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Common flags are defined as follows:
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1 - normalize Normalize peak amplitude of wave to 1.0.
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2 - wavetable If set, then the buffer is written in wavetable
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format so that it can be read by interpolating
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oscillators.
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4 - clear If set then the buffer is cleared before new partials
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are written into it. Otherwise the new partials are
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summed with the existing contents of the buffer.
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sine1
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int - flags, see above
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[
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float - partial amplitude
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] * N
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Fills a buffer with a series of sine wave partials. The first float
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value specifies the amplitude of the first partial, the second float
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value specifies the amplitude of the second partial, and so on.
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sine2
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int - flags, see above
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[
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float - partial frequency (in cycles per buffer)
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float - partial amplitude
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] * N
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Similar to sine1 except that each partial frequency is specified
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explicitly instead of being an integer series of
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partials. Non-integer partial frequencies are possible.
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sine3
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int - flags, see above
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[
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float - partial frequency (in cycles per buffer)
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float - partial amplitude
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float - partial phase
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] * N
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Similar to sine2 except that each partial may have a nonzero
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starting phase.
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cheby
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int - flags, see above
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[
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float - amplitude
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] * N
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Fills a buffer with a series of chebyshev polynomials, which can be
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defined as: cheby(n) = amplitude * cos(n * acos(x)). The first
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float value specifies the amplitude for n = 1, the second float
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value specifies the amplitude for n = 2, and so on. To eliminate a
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DC offset when used as a waveshaper, the wavetable is offset so that
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the center value is zero.
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copy
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int - sample position in destination
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int - source buffer number
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int - sample position in source
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int - number of samples to copy
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Copy samples from the source buffer to the destination buffer
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specified in the b_gen command. If the number of samples to copy is
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negative, the maximum number of samples possible is copied.
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Asynchronous. Replies to sender with /done when complete.
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