Note

#rx_tape #javascript #webaudio

Managed to get some audio out of the tape recorder. it's making sound but it does not sound good .. yet.

I got it recording and downloading lossless audio! 🎉 so it’s:

creating an AudioContext at 48kHz
adding a worklet that chunks up 32 bit stereo audio samples to post them to the main thread
receiving those chunks and writing them into standard sized IndexedDB samples
(async) iterating through all those samples and creating a WAV blob for the browser to download

I’m very much regretting my goal of “no libraries”, but I’ve learned quite a lot in doing so! The next step is to work out how to play the audio in-browser with variable playback speeds (for fast forward/rewind)

Screenshot of an audio waveform in audacity

Screenshot of Audacity app showing stereo audio waveforms

metadata

Open on GiHub

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