The goal is to create a simple drum machine sequencer that allows you to "play" your own version of the famous four-on-the-floor pattern, as shown below:
This solution uses portaudio for playback. more specifically gordonklaus golang port
Please follow their installation steps if necessary.
The Linux 64bit library is already part of this repo as I have used Ubuntu.
brew install mpg123
brew install portaudio
go get -v github.com/gordonklaus/portaudio/...
sudo apt install libmpg123-dev portaudio19-dev
go get -v github.com/gordonklaus/portaudio/...
Before running please make sure that the project is in Go path:
export GOPATH=$(pwd)
go run main.go -song examples/four_on_floor.trk should render Four on Floor playback
-song Path to the song to be played. Required
-tempo Playback speed (BPM). Defaults to 500BPM
-loop Number of times to loop through the song pattern. Defaults to 3
Make sure to run
go run main.go -song examples/blue_monday.trk -loop 1
Current samples contain:
Currently the code supports only one specific format for playback.
If you wish to add additional samples please run:
go run src/github.com/gordonklaus/portaudio/examples/record.go samples/new_sample_name
I've chosen to create my own simple format to easily edit the track. It seems easy to understand and has the ability to visually align all the tracks.
HiHat --+---+---+---+- samples/hihat.aiff
Snare ----+-------+--- samples/snare.aiff
Kick +---+---+---+--- samples/kick.aiff
First column is the track label used for display during playback (keep it short;) Following is the pattern for the current track.
+ means sound, - means no sound.
The last column has the path to the samples to use (relative to pwd).
The columns are separated by any number of white spaces so that it is easy to align the track patterns for tracks with labels of different lengths.