virtual-sheet-magic

Features

• Parse sheets into JSON with MIDI value indices and pause values (depends on JSONS, may be reimplemented)
• Play virtual piano sheets
• TODO: Play MIDI files as virtual piano keys
• TODO: Make, edit and listen to virtual piano sheets

Notes

Unfortunately, a lot of virtual piano sheets do not have appropriate pausing; they are made to be played more according to the feel and your knowledge of the song. You may need to adjust the sheet with an editor of your choice and use the following symbols to pause appropriately.

• ' (1/16)
• |, - (1/8)
• = (1/4)
• : (1/2)

You can adjust individual note value by appending symbols to keys as well.

• < (to divide rhythmic value by 2 per each < symbol, 1/8 -> 1/16 -> 1/32 -> 1/64...)
• > (to multiply rhythmic value by 2 per each > symbol, 1/8 -> 1/4 -> 1/2 -> 1...)

Additionally, you can use chords to play multiple keys at once.

• [] - play keys simultaneuosly
• {} - play keys near simultaneously, where each note has a rhythmic value of 1/32

Installation

Set up virtual-sheet-magic in a virtualenv - this way, you will not pollute your system-wide install.
(If you know how to package Python projects, feel free to fork & submit a pull request.)

$ python -m virtualenv .venv && source .venv/bin/activate && pip install -r requirements.txt

keyboard versus pynput

At the time of writing, pynput on Windows sends simulated keypresses which may not work with all applications.
However, on Linux, keyboard requires root access, which is rather inconvenient and a potential security risk.

By default, the program uses pynput as it should work for most scenarios. If you're on Windows and an application is not receiving keystrokes, try using --input-wrapper keyboard when you play a sheet.

Usage

positional arguments:
  {play,p,parse}
    play (p)      Plays a virtual sheet from `stdin`. Outputs seeker value on exit to `stdout`

options:
  -h, --help      show this help message and exit

play

play [-h] [--input-wrapper INPUT_WRAPPER] [--seek SEEK] [--tempo TEMPO] [--newline-pauses]

options:
  -h, --help            show this help message and exit
  --input-wrapper INPUT_WRAPPER, -w INPUT_WRAPPER

                        Use an input wrapper preferable to your system configuration
                        	pynput - preferable on X11, macOS
                        	keyboard - preferable on Microsoft Windows
  --seek SEEK, -s SEEK  Start the player at the provided number (measured in notes)
  --tempo TEMPO, -t TEMPO

                        Overrides the tempo of the sheet being played.
                        If not provided, uses the sheet's tempo or default (120)
  --newline-pauses, -N  Toggle whether a newline should count as a `|` (pause) note

Example usage

Browse around Virtual Piano's collection of sheets and copy into clipboard or save into a file to try it out.

$ python main.py play -t 110 < my-vp-sheet.txt
$ sleep 1; python main.py play -t 110 < my-vp-sheet.txt
$ xclip -o | python main.py play -t 160
$ sleep 1; xclip -o | python main.py play -s echo $([ -f /tmp/seeker-stopped-at ] && cat /tmp/seeker-stopped-at || echo 0) -t 160 > /tmp/seeker-stopped-at