Audio Tool
This is an advanced version of SOX written in Go with all the algorithms implemented from scratch save for the high quality resampling.
Installation
For development you will need Go, SOX and (audiowaveform)[https://github.com/bbc/audiowaveform]
Usage
Pass an in file, out file and config file to the binary.
main -c config/uprez.toml -in path/to/file.wav -out path/to/outfile.wav
Config file
The config file describes the types of transforms to apply to the audio. The types of transforms are:
- Bit depth conversion (i.e. 16 -> 24)
- Resampling (i.e. 44.1k -> 48k)
- High and Low pass filters
- Constant Q parametric
- Variable-knee lookahead compressor
Example config
# Master section lets you define target sample rate and bit depth.
[master]
# Scale input before processing.
gain=0.8
# Target bit depth
bitdepth=24.0
# Target sample rate
samplerate=48000
# 0.95 - 0.99 - may fail above .97
bandwidth=0.97
# 0.01 - 0.1 - may fail the lower you go
ripplefactor=0.1
# 100 - 159
rippleattenuation=150.0
# Don't edit
tolerance=0.000001
# Compressor lets you apply compression :)
[compressor]
inputgain=1.0
outputgain=1.0
threshold=-5.0
# 30 - 300 but can handle any input techinally.
# For example you can use a super fast attack like 0.1
attacktime=0.1
releasetime=150.0
# 1 - 20
ratio=2.0
# 0 - 20. 0 = hard knee and 20 = soft knee
knee=10.0
# How much look ahead time. If many transients this can solve
# the slow compressor problem
lookaheaddelay=5000.0
# No use
stereolink=0
# No Use
processortype=0
# Should be same as samplerate in master section
samplerate=48000.0
# "analog" setting. This effects how the attack and release
# are calculated. See compressor module for algorithm.
analog=false
# HPF and LPF filters.
# Butterworth curve
[hpf]
freq=0.0
[lpf]
freq=20000.0
# Peaking filters - using constant q so these sound reasonable
# at various gain settings.
[[parametric]]
freq=200.0
gain=1.0
q=0.5
[[parametric]]
freq=5000.0
gain=3.0
q=1.0
[[parametric]]
freq=15000.0
gain=8.0
q=1.0
# [[parametric]]
# freq=20000.0
# gain=3.0
# q=0.3