This is the command soundstretch that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
soundstretch - audio processing utility
SYNOPSIS
soundstretch infile.wav outfile.wav [options]
DESCRIPTION
SoundStretch is a simple command-line application that can change tempo, pitch and
playback rates of WAV sound files. This program is intended primarily to demonstrate how
the "SoundTouch" library can be used to process sound in your own program, but it can as
well be used for processing sound files.
USAGE
SoundStretch Usage syntax:
"infile.wav" Name of the input sound data file (in .WAV audio file format). Give
"stdin" as filename to use standard input pipe.
"outfile.wav" Name of the output sound file where the resulting sound is saved (in .WAV
audio file format). This parameter may be omitted if you don't want to save the output
(e.g. when only calculating BPM rate with '-bpm' switch). Give "stdout" as filename to use
standard output pipe.
[options] Are one or more control options.
OPTIONS
Available control options are:
-tempo=n Change the sound tempo by n percents (n = -95.0 .. +5000.0 %)
-pitch=n Change the sound pitch by n semitones (n = -60.0 .. + 60.0 semitones)
-rate=n Change the sound playback rate by n percents (n = -95.0 .. +5000.0 %)
-bpm=n Detect the Beats-Per-Minute (BPM) rate of the sound and adjust the tempo to meet
'n' BPMs. When this switch is applied, the " -tempo" switch is ignored. If "=n" is
omitted, i.e. switch " -bpm" is used alone, then the BPM rate is estimated and displayed,
but tempo not adjusted according to the BPM value.
-quick Use quicker tempo change algorithm. Gains speed but loses sound quality.
-naa Don't use anti-alias filtering in sample rate transposing. Gains speed but loses
sound quality.
-license Displays the program license text (LGPL)
NOTES
* To use standard input/output pipes for processing, give "stdin" and "stdout" as
input/output filenames correspondingly. The standard input/output pipes will still carry
the audio data in .wav audio file format.
* The numerical switches allow both integer (e.g. " -tempo=123") and decimal (e.g. "
-tempo=123.45") numbers.
* The " -naa" and/or " -quick" switches can be used to reduce CPU usage while compromising
some sound quality
* The BPM detection algorithm works by detecting repeating bass or drum patterns at low
frequencies of <250Hz. A lower-than-expected BPM figure may be reported for music with
uneven or complex bass patterns.
EXAMPLES
Example 1
The following command increases tempo of the sound file "originalfile.wav" by 12.5% and
stores result to file "destinationfile.wav":
soundstretch originalfile.wav destinationfile.wav -tempo=12.5
Example 2
The following command decreases the sound pitch (key) of the sound file "orig.wav" by two
semitones and stores the result to file "dest.wav":
soundstretch orig.wav dest.wav -pitch= -2
Example 3
The following command processes the file "orig.wav" by decreasing the sound tempo by 25.3%
and increasing the sound pitch (key) by 1.5 semitones. Resulting .wav audio data is
directed to standard output pipe:
soundstretch orig.wav stdout -tempo= -25.3 -pitch=1.5
Example 4
The following command detects the BPM rate of the file "orig.wav" and adjusts the tempo to
match 100 beats per minute. Result is stored to file "dest.wav":
soundstretch orig.wav dest.wav -bpm=100
Example 5
The following command reads .wav sound data from standard input pipe and estimates the BPM
rate:
soundstretch stdin -bpm
NOTES
Converted from the README.html that comes with SoundTouch.
soundstretch(1)
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