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RTBUF Procedure Reference

Dynamic

Signal dynamic range processing functions.

Dynamic Limiter

Limits the dynamic range of a signal.

Inputs :

  • signal (signal)
  • gain (signal)
  • treshold (signal)
  • attack (signal) Attack time in seconds.
  • release (signal) Release time in seconds.

Outputs :

  • signal (signal)

Portaudio

PortAudio library for portable hardware audio I/O.

Portaudio Input

TODO

Portaudio Output

Stereo output using PortAudio .

Inputs :

  • left (signal)
  • right (signal)

Outputs :

  • samples (short[2048]) Sample data in PortAudio format.

Signal

Basic signal processing functions.

See rtbuf_signal.c for details.

Signal Bandpass2

Butterworth second order band-pass filter.

Inputs :

  • signal (signal)
  • cutoff (signal)
  • qfactor (signal)

Outputs :

  • signal (signal)

Signal Delay

Non-interpolating simple delay line.

Inputs :

  • signal (signal)
  • delay (signal) Delay time in seconds. [0, RTBUF_SIGNAL_DELAY_MAX]
  • feedback (signal) Feedback. [0, 1]

Outputs :

  • signal (signal)

Signal Equalizer10

10 band Butterworth second order band-pass filters and their output.

Inputs :

  • signal (signal)
  • amp32 (signal) Amplification at 32 Hz. [0, 2]
  • amp64 (signal) Amplification at 64 Hz. [0, 2]
  • amp128 (signal) Amplification at 128 Hz. [0, 2]
  • amp256 (signal) Amplification at 256 Hz. [0, 2]
  • amp512 (signal) Amplification at 512 Hz. [0, 2]
  • amp1k (signal) Amplification at 1 kHz. [0, 2]
  • amp2k (signal) Amplification at 2 kHz. [0, 2]
  • amp4k (signal) Amplification at 4 kHz. [0, 2]
  • amp8k (signal) Amplification at 8 kHz. [0, 2]
  • amp16k (signal) Amplification at 16 kHz. [0, 2]

Outputs :

  • signal (signal)
  • signal32 (signal) Signal at 32 Hz.
  • signal64 (signal) Signal at 64 Hz.
  • signal128 (signal) Signal at 128 Hz.
  • signal256 (signal) Signal at 256 Hz.
  • signal512 (signal) Signal at 512 Hz.
  • signal1k (signal) Signal at 1 kHz.
  • signal2k (signal) Signal at 2 kHz.
  • signal4k (signal) Signal at 4 kHz.
  • signal8k (signal) Signal at 8 kHz.
  • signal16k (signal) Signal at 16 kHz.

Signal Flanger

Flanger effect. Mixes dry signal with delayed signal.

Inputs :

  • signal (signal)
  • frequency (signal) Delay oscillator frequency. [0, 24000]
  • amplitude (signal) Delay oscillator amplitude. [0, 1]
  • delay (signal) Minimum delay. [0, 1]
  • feedback (signal) Delay feedback. [0, 1]

Outputs :

  • signal (signal)

Signal Hipass

Signal Hipass2

Signal Hipass3

Signal Hipass4

Signal Hipass5

Butterworth first, second, third, fourth and fifth order high-pass filters.

Cuts frequencies lower than cutoff.

Inputs :

  • signal (signal)
  • cutoff (signal) Cutoff frequency. [0, 24000]

Outputs :

  • signal (signal)

Signal Lopass

Signal Lopass2

Signal Lopass3

Signal Lopass4

Signal Lopass5

Butterworth first, second, third, fourth and fifth order low-pass filters.

Cuts frequencies higher than cutoff.

Inputs :

  • signal (signal)
  • cutoff (signal) Cutoff frequency. [0, 24000]

Outputs :

  • signal (signal)

Signal Sawtooth

Generates a sawtooth signal at given frequency. Phase starts at zero.

Inputs :

  • frequency (signal) [0, 24000]
  • amplitude (signal) [0, 1]

Outputs :

  • signal (signal)

Signal Sinus

Generates a sinus signal at given frequency. Phase starts at zero.

Inputs :

  • frequency (signal) [0, 24000]
  • amplitude (signal) [0, 1]

Outputs :

  • signal (signal)

Signal Square

Generates a square signal at given frequency and pulse width. Phase starts at zero.

Inputs :

  • frequency (signal) [0, 24000]
  • amplitude (signal) [0, 1]
  • pulse (signal) Pulse width. [0, 1]

Outputs :

  • signal (signal)

Sndio

OpenBSD sndio library for hardware audio I/O.

Sndio Input

TODO

Sndio Output

Stereo output using sndio .

Inputs :

  • left (signal)
  • right (signal)

Outputs :

  • samples (short[2048]) Sample data in sndio format.

Synth

A synthetizer collection.

Synth ADSR

Attack decay sustain release enveloppe.

Inputs :

  • note (note) Note. See rtbuf_music.h
  • attack (signal) Attack time in seconds.
  • decay (signal) Decay time in seconds.
  • sustain (signal) Sustain level.
  • release (signal) Release time in seconds.

Outputs :

  • signal (signal)

Synth Synth

Synthesizer.

Inputs :

  • envelope (signal) Connect an enveloppe buffer which will be cloned for each note played.
  • oscillator (signal) Connect an oscillator buffer which will be cloned for each note played.
  • note (notes) Connect a keyboard notes here.

Outputs :

  • signal (signal)
  • note_n (unsigned int) Number of notes playing.