This repo contains a small C program that outputs a sine wave of a determined frequency in binary form. That means that when you say something like
./wave 100.0You will only see gibberish. However, it is useful because you can pipe the
output to aplay or sox and be able to play music.
git clone https://github.com/efferifick/wave
cd wave
make installOne can further specify install path by
make prefix=/path/to install
usage:
wave [options] [FREQ1 FREQ2 FREQ3 ..]
options:
-h Prints out this message.
--help
-v Prints out program version.
--version
-a DOUBLE Sets amplitude value.
--amplitude DOUBLE Default: 1.0
-r INT Sets sampling rate.
--rate INT Default: 48000 (Hz).
-s INT Sets number of samples to be taken.
--samples INT Defaults: 48000. (Equivalent to 1 second on default
rate)
-f PATH Sets input file.
--file PATH
NOTES:
For best results amplitude should be in the range of [0, 1].
If no arguments are given, input is expected from stdin. This is useful
for piping. Input is expected as though reading from a file. Ex.
echo 48000 1.0 440 | ./wave | sox -t raw -r 48000 -e \
floating-point -c 1 -b 32 - -tcoreaudio
If reading from a file or stdin, the program expects this input format.
<SAMPLES> <AMPLITUDE> <FREQ1> <FREQ2> <...>
<SAMPLES> <AMPLITUDE> <FREQ1> <FREQ2> <...>
<SAMPLES> <AMPLITUDE> <FREQ1> <FREQ2> <...>
Each line will output after the one before has run out of samples.
Get the source or file an issue at:
https://github.com/efferifick/wave
The output is given by a float. This is done so that we can play its output with the standard audio format PCM 32 bytes.
on linux:
cd examples
m4 -R music.m4f -Q chopsticks.txt | awk '{$1 = $1*48000; print $0}' | wave | aplay -f FLOAT_LE -r 48000 -c 1 -qon mac:
cd examples
m4 -R music.m4f -Q chopsticks.txt | awk '{$1 = $1*48000; print $0}' | wave | sox -t raw -r 48000 -e floating-point -c 1 -b 32 - -tcoreaudiomake uninstall