RemiAudio

RemiAudio is a collection of audio format I/O routines, codecs, and DSP processors/effects written entirely in Crystal.

Source Code Repository

Features

A list of supported features and planned features.

• WAV format support
  • Reading of WAV files
  • Writing of WAV files
  • 1 to 24 channels
  • Sample rates from 8000hz to 352800hz
  • Integer sample formats: unsigned 8-bit, signed 12, 16, 24, 32, and 64-bit
  • IEEE Floating Point sample formats: 32-bit and 64-bit
  • μ-law and A-law sample formats
  • Extensible formats (ADPCM, MP3, etc.)
  • Related RIFF chunks (cue , inst, smpl, ltxt, note, labl, plst, etc.)
• Au format support
  • Reading of Au files
  • Writing of AU files
  • 1 or 2 channels
  • Integer sample formats: unsigned 8-bit, signed 16, 24, and 32-bit
  • IEEE Floating Point sample formats: 32-bit and 64-bit
  • Sample rates from 8000hz to 352800hz
• Encoders/Decoders
  • YM2610 ADPCM-A codec
  • YM2610 ADPCM-B codec
  • High quality μ-law and A-law codec
• Processing
  • Bit-depth conversion with optional TDPF dithering
  • Sample format conversions
  • High-quality sample rate conversions
• Filters
  • Multi-mode biquad Filter (lowpass, highpass, bandpass, notch, allpass, peaking EQ, lowshelf, highshelf)
  • Separate biquad filter optimized for lowpass usage
  • Lowpass filter similar to what’s found in a CEM3394
  • Lowpass filter similar to a SSM2040
  • “Hornet Filter”, a fun approximation of an EDP Wasp’s lowpass filter
  • Lowpass filter similar to what’s found on a Korg MS-20
• Effects
  • Soft clipping
  • Stereo enhancement
  • MVerb reverb effect
  • Zita-Rev1-based reverb effect
  • Freeverb-based reverb effect (Schroeder class)
  • Chorus effect inspired by an 80s synth with model number ending in “-60”
  • Parametric EQ, mono and stereo variations, with an arbitrary number of bands
• Demuxing
  • Basic Ogg demuxer
• Audio Backend Abstraction
  • PulseAudio
  • PortAudio
  • libao
• Other
  • Windowing functions (Blackman, Blackman-Harris, Hamming, Nuttall, Blackman-Nuttal, Hann)
  • CUE sheet reading and writing
  • XSPF/JSPF playlist reading and writing
  • Vorbis Comments handling (read-only)