C program to generate sounds and music from (descriptions) of sound waves.
Sample music produced by SoundGen
Waveform formula from "wavfile: A Simple Sound Library", by Douglas Thain.
amplitude_at_sample_N = tone_amplitude_max * sin(2 * PI * frequency * (N/sample_rate))
wavfile library (wavfile.c and wavfile.h) from "wavfile: A Simple Sound Library", by Douglas Thain. These files are licensed under Creative Commons Attribution License.
This project (except for the above-mentioned wavfile.c and wavfile.h) is licensed under the MIT license. See the LICENSE file.
$ cc soundgen.c wavfile.c -lm -o soundgen
Produces the binary ./soundgen.
SoundGen takes a file (tones_file) describing the sound wave, and a filename for the output audio file (output_wav_file). Optionally plays
the output audio (--play option).
$ ./soundgen {tones_file} {output_wav_file} [--play]
tones_file is a newline-separated file of space-separated triplets of (duration, frequency, amplitude%). This describes the sound wave.
For example, a file, say tones.txt, with:
4 44 100
6 440 100
2 440 50
describes a sound wave of 4 seconds of 44 Hz waves at 100% amplitude, then 6s of 440 Hz at 100%, then 2s of 440 Hz at 50%.
To generate sound from the above tones.txt file,
$ ./soundgen tones.txt output.wav --play
will generate a wav file output.wav with audio as described above, and will play output.wav.
Wav file produced by above command: sample/example.wav
NOTE: The maximum amplitude of a sound card is 32768. The amplitude% value taken is a percentage of this.
NOTE: Values duration and frequency can be decimals.
The following generates the Sa-Re-Ga-Ma-Pa-Dha-Ni-Sa2-Sa2-Ni-Dha-Pa-Ma-Ga-Re-Sa tone from Indian Classical Music:
$ cat saregama.txt
2 240 100
2 270 100
2 300 100
2 320 100
2 360 100
2 400 100
2 450 100
2 480 100
0.5 480 0
2 480 100
2 450 100
2 400 100
2 360 100
2 320 100
2 300 100
2 270 100
2 240 100
$ ./soundgen saregama.txt saregama.wav
Wav file: sample/saregama.wav
Tones file: sample/saregama.txt