audioplotter

create graphics for penplotters from audio files, aka waveforms, soundwaves.

• analyses audio: calculate "peaks" (volume per time slot for N numbers of slots)
• visualize peaks styles:
  • zigzag: alternates drawing points above and below the horizontal centerline. looks like a standard waveform from far, and like a frequency graph up close. Not symmetric
  • saw: follows a Sawtooth wave pattern. Is symmetric but has more line density per bands.

Ideas

• addCaps: also add line of configurable length to start and end (like starting with silence, but just a horixontal line)
• playback of the audio
• show audio file info
• better download option
• options to trim start/endpoint of audio (needed for amen break demo, wikimedia hosted file hast context around it)
• separate frequencies, create 1 graph per band in different colors (low/red,mid/green,high/yellow)

Credits

Thanks to Matthew Ström for writing the article "Making an Audio Waveform Visualizer with Vanilla JavaScript" on css-tricks.com and open-sourcing the example code, on which the initial prototype of this tool is based.

tests

Work In Progress, only 1 "smoke" scenario implemented so far

• Written using RSpec, run with Docker.
• Setup based on examples:
  • https://github.com/vercel/next.js/tree/79016b879f200c99cc3c3b69b2b84dee14b6615e/examples/with-docker
  • https://www.plymouthsoftware.com/articles/rails-on-docker-system-specs-in-containers-with-rspec-capybara-chrome-and-selenium

cd spec
bin/build
bin/rspec features/example_spec.rb

Development

This is a Next.js project bootstrapped with create-next-app.

Getting Started

First, run the development server:

npm run dev
# or
yarn dev

Open http://localhost:3000 with your browser to see the result.

You can start editing the page by modifying pages/index.js. The page auto-updates as you edit the file.

API routes can be accessed on http://localhost:3000/api/hello. This endpoint can be edited in pages/api/hello.js.

The pages/api directory is mapped to /api/*. Files in this directory are treated as API routes instead of React pages.

Learn More

To learn more about Next.js, take a look at the following resources:

• Next.js Documentation - learn about Next.js features and API.
• Learn Next.js - an interactive Next.js tutorial.

You can check out the Next.js GitHub repository - your feedback and contributions are welcome!

Deploy on Vercel

The easiest way to deploy your Next.js app is to use the Vercel Platform from the creators of Next.js.

Check out our Next.js deployment documentation for more details.