web-audio-wave-recorder

> Record wav files using Web Audio APIs

Unfortunately, [MediaRecorder][] does not support [wav][] files (technically linear PCM encoding). This uses the older and less fluent [AudioContext][] API, manually dealing with audio buffers and .wav header construction.

[wav]: https://en.wikipedia.org/wiki/WAV
[audiocontext]: https://developer.mozilla.org/en-US/docs/Web/API/AudioContext
[mediarecorder]: https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder

API

$3

Takes optional [recording options][] and starts recording.

[recording options]: https://github.com/tlvince/web-audio-wave-recorder/blob/b1fb40ca7cfe4242351806b1a2938e66532cc840/src/index.ts#L15-L20

$3

Takes required [recording state][] and returns a blob of type audio/wav.

[recording state]: https://github.com/tlvince/web-audio-wave-recorder/blob/b1fb40ca7cfe4242351806b1a2938e66532cc840/src/index.ts#L3-L13

Prior art

- Based heavily on [meziantou: Javascript - Record audio][1]
- References [Capturing Voice Input in a Browser and Sending it to Amazon Lex][2]

[1]: https://gist.github.com/meziantou/edb7217fddfbb70e899e
[2]: https://aws.amazon.com/blogs/machine-learning/capturing-voice-input-in-a-browser/

Author

© 2019 Tom Vincent (https://tlvince.com)

License

Released under the MIT license.