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
  • [x] Reading of WAV files
  • [x] Writing of WAV files
  • [x] 1 to 24 channels
  • [x] Sample rates from 8000hz to 352800hz
  • [x] Integer sample formats: unsigned 8-bit, signed 12, 16, 24, 32, and 64-bit
  • [x] IEEE Floating Point sample formats: 32-bit and 64-bit
  • [x] 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
  • [x] Reading of Au files
  • [x] Writing of AU files
  • [x] 1 or 2 channels
  • [x] Integer sample formats: unsigned 8-bit, signed 16, 24, and 32-bit
  • [x] IEEE Floating Point sample formats: 32-bit and 64-bit
  • [x] Sample rates from 8000hz to 352800hz
• Encoders/Decoders
  • [x] MPEG-1 Layer I, II, and III (MP1/MP2/MP3) (decoding only)
  • [x] FLAC (decoding only)
  • [x] YM2610 ADPCM-A codec
  • [ ] YM2610 ADPCM-B codec
  • [x] High quality μ-law and A-law codec
• Processing
  • [x] Bit-depth conversion with optional TDPF dithering
  • [x] Sample format conversions
  • [/] Sample rate conversions (partially implemented, see NOTES file, and Known Issues section below)
• Filters
  • [x] Multi-mode biquad Filter (lowpass, highpass, bandpass, notch, allpass, peaking EQ, lowshelf, highshelf)
  • [x] Separate biquad filter optimized for lowpass usage
  • [x] Lowpass filter similar to what’s found in a CEM3394
  • [x] Lowpass filter similar to a SSM2040
  • [x] “Hornet Filter”, a fun approximation of an EDP Wasp’s lowpass filter
  • [x] Lowpass filter similar to what’s found on a Korg MS-20
• Effects
  • [x] Soft clipping
  • [x] Stereo enhancement
  • [x] MVerb reverb effect
  • [x] Zita-Rev1-based reverb effect
  • [x] Freeverb-based reverb effect (Schroeder class)
  • [x] Chorus effect inspired by an 80s synth with model number ending in “-60”
  • [x] Parametric EQ, mono and stereo variations, with an arbitrary number of bands
• Other
  • [x] Windowing functions (Blackman, Blackman-Harris, Hamming, Nuttall, Blackman-Nuttal, Hann)
  • [x] CUE sheet reading and writing
  • [x] 100% Crystal :D