This is a simple sine wave genearator.

Compiling:

ghc Main.hs

should be enough

Usage:

./executable input.n output.wav

The input.n file is a simple text file containing instructions:

bpm [float > 0]
vol [float 0.0 - 1.0]
n [note string] [float > 0]
s [float > 0]
sr [int > 0]
att [float > 0]
rel [float > 0]

bpm sets the beats per minute vol sets the volume n is for creating a note s is for silence sr is for setting the sample rate of the output file att is to set the attack time for each note rel is to set the release time for each note

so a simple example would be:

bpm 150.0
sr 48000
att 0.2
rel 0.2
vol 0.5

n c4 1.0
n d4 1.0
n e4 1.0
n f4 1.0
n g4 1.0
n a4 1.0
n b4 1.0
n c5 1.0

The available notes can be found in the Notes.hs file, but basically for a c sharp the programm expects c4# and for a c flat type c4b. The numbers can range from 1 to 8. If a note cannot be found in the program's list the program will fail.

(the file can be found in the example directory with the resulting .wav file)

bpm, att, rel and vol can be used multiple times. sr can also be used multiple times but only the first one will be used to set the sample rate of the file so the others sr instructions will modify the following notes.

The cpp folder contains a simpler c++ version of the SineGenerator. The language expected is basically the same except that one line is an instruction if it begins with one of the 6 key-words, it is ignored otherwise. So a line starting with '//' is ignored so you can have comments but they have to be at the beginning of the line and the whole line will be ignored.

Compile:

g++ -lm -std=c++11 main.cpp

Usage:

./a.out in out

in and out should be file names, but if you use a '-' then stdin/stdout will be used instead. So if you want a more complex commenting system you could pipe the file through another program that removes comments before piping it to the SineGenerator.

The C++ version is faster and uses less memory, but the haskell version uses a real parser instead of the pseudo-parser used in the C++ version. However I have not noticed any problem with that and I find the error messages of the C++ messages more readable.

Both versions have the same functionality for now, but the C++ version is a simpler implementation of it.