How to use web audio api to get raw pcm audio?

Question

How usergetmedia to use the microphone in chrome and then stream to get raw audio? I need need to get the audio in linear 16.

Answer 1

The only two examples I've found that are clear and make sense are the following:

AWS Labs: https://github.com/awslabs/aws-lex-browser-audio-capture/blob/master/lib/worker.js

The AWS resource is very good. It shows you how to export your recorded audio to "WAV format encoded as PCM". Amazon Lex, which is a transcription service offered by AWS requires the audio to be PCM encoded and wrapped in a WAV container. You can merely adapt some of the code to make it work for you! AWS has some additional features such as "downsampling" which allows you to change the sample rate without affecting the recording.

RecordRTC: https://github.com/muaz-khan/RecordRTC/blob/master/simple-demos/raw-pcm.html

RecordRTC is a complete library. You can, once again, adapt their code or find the snippet of code that encodes the audio to raw PCM. You could also implement their library and use the code as-is. Using the "desiredSampleRate" option for audio config with this library negatively affects the recording.

They are both excellent resources and you'll definitely be able to solve your question.