1 The current release handles the following audio file formats:
4 * Raw files in various binary formats
10 ** G7xx ADPCM files (read only)
11 ** mutant DEC .au files
14 * CDDA (Compact Disc Digital Audio format)
15 * CVS and VMS files (continuous variable slope)
16 * Grandstream ring-tone files
20 * Macintosh HCOM files
22 * AMR-WB & AMR-NB (with optional libamrwb & libamrnb libraries)
23 * MP2/MP3 (with optional libmad, libtwolame and libmp3lame libraries)
24 * Opus files (read only; with optional Opus libraries)
26 * Ogg Vorbis files (with optional Ogg Vorbis libraries)
27 * FLAC files (with optional libFLAC)
28 * IRCAM SoundFile files
30 * Turtle beach SampleVision files
31 * Sounder & Soundtool (DOS) files
32 * Yamaha TX-16W sampler files
33 * SoundBlaster .VOC files
34 * Dialogic/OKI ADPCM files (.VOX)
35 * Microsoft .WAV files
36 ** PCM, floating point
37 ** u-law, A-law, MS ADPCM, IMA (DMI) ADPCM
40 * WavPack files (with optional libwavpack library)
41 * Psion (palmtop) A-law WVE files and Record voice notes
42 * Maxis XA Audio files
43 ** EA ADPCM (read support only, for now)
44 * Pseudo formats that allow direct playing/recording from most audio devices
45 * The "null" pseudo-file that reads and writes from/to nowhere
48 The audio effects/tools included in this release are as follows:
51 ** allpass: RBJ all-pass biquad IIR filter
52 ** bandpass: RBJ band-pass biquad IIR filter
53 ** bandreject: RBJ band-reject biquad IIR filter
54 ** band: SPKit resonator band-pass IIR filter
55 ** bass: Tone control: RBJ shelving biquad IIR filter
56 ** equalizer: RBJ peaking equalisation biquad IIR filter
57 ** firfit+: FFT convolution FIR filter using given freq. response (W.I.P.)
58 ** highpass: High-pass filter: Single pole or RBJ biquad IIR
59 ** hilbert: Hilbert transform filter (90 degrees phase shift)
60 ** lowpass: Low-pass filter: single pole or RBJ biquad IIR
61 ** sinc: Sinc-windowed low/high-pass/band-pass/reject FIR
62 ** treble: Tone control: RBJ shelving biquad IIR filter
65 ** chorus: Make a single instrument sound like many
66 ** delay: Delay one or more channels
68 ** echos: Add a sequence of echos
69 ** flanger: Stereo flanger
70 ** overdrive: Non-linear distortion
71 ** phaser: Phase shifter
72 ** repeat: Loop the audio a number of times
73 ** reverb: Add reverberation
74 ** reverse: Reverse the audio (to search for Satanic messages ;-)
75 ** tremolo: Sinusoidal volume modulation
77 * Volume/level effects
78 ** compand: Signal level compression/expansion/limiting
79 ** contrast: Phase contrast volume enhancement
80 ** dcshift: Apply or remove DC offset
81 ** fade: Apply a fade-in and/or fade-out to the audio
82 ** gain: Apply gain or attenuation; normalise/equalise/balance/headroom
83 ** loudness: Gain control with ISO 226 loudness compensation
84 ** mcompand: Multi-band compression/expansion/limiting
85 ** norm: Normalise to 0dB (or other)
86 ** vol: Adjust audio volume
89 ** pad: Pad (usually) the ends of the audio with silence
90 ** silence: Remove portions of silence from the audio
91 ** splice: Perform the equivalent of a cross-faded tape splice
92 ** trim: Cuts portions out of the audio
93 ** vad: Voice activity detector
96 ** channels: Auto mix or duplicate to change number of channels
97 ** divide+: Divide sample values by those in the 1st channel (W.I.P.)
98 ** remix: Produce arbitrarily mixed output channels
99 ** swap: Swap pairs of channels
101 * Pitch/tempo effects
102 ** bend: Bend pitch at given times without changing tempo
103 ** pitch: Adjust pitch (= key) without changing tempo
104 ** speed: Adjust pitch & tempo together
105 ** stretch: Adjust tempo without changing pitch (simple alg.)
106 ** tempo: Adjust tempo without changing pitch (WSOLA alg.)
109 ** dither: Add dither noise to increase quantisation SNR
110 ** rate: Change audio sampling rate
112 * Specialised filters/mixers
113 ** deemph: ISO 908 CD de-emphasis (shelving) IIR filter
114 ** earwax: Process CD audio to best effect for headphone use
115 ** noisered: Filter out noise from the audio
116 ** oops: Out Of Phase Stereo (or `Karaoke') effect
117 ** riaa: RIAA vinyl playback equalisation
120 ** noiseprof: Produce a DFT profile of the audio (use with noisered)
121 ** spectrogram: graph signal level vs. frequency & time (needs `libpng')
122 ** stat: Enumerate audio peak & RMS levels, approx. freq., etc.
123 ** stats: Multichannel aware `stat'
125 * Miscellaneous effects
126 ** ladspa: Apply LADSPA plug-in effects e.g. CMT (Computer Music Toolkit)
127 ** synth: Synthesise/modulate audio tones or noise signals
128 ** newfile: Create a new output file when an effects chain ends.
129 ** restart: Restart 1st effects chain when multiple chains exist.
131 * Low-level signal processing effects
132 ** biquad: 2nd-order IIR filter using externally provided coefficients
133 ** downsample: Reduce sample rate by discarding samples
134 ** fir: FFT convolution FIR filter using externally provided coefficients
135 ** upsample: Increase sample rate by zero stuffing
137 + Experimental or incomplete effect; may change in future.
139 Multiple audio files can be combined (and then further processed with
140 effects) using any one of the following combiner methods:
144 * merge: E.g. two mono files to one stereo file
145 * sequence: For playing multiple audio files/streams