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Web Speech API does not provide a means to capture audio output of speechSynthesis.speak(new SpeechSynthesis.speak()). Using Native Messaging we start a local server, send input text or SSML to the local server with fetch(), pass the input data to local speech synthesis engine, in this case espeak-ng, get response back as WAV in the browser, which we parse to Float32Array and write to a MediaStreamTrackGenerator which we then output speakers and/or share with peers (https://github.com/guest271314/native-messaging-espeak-ng; https://github.com/espeak-ng/espeak-ng/tree/master/chromium_extension).
Web Speech API does not provide a means to capture audio output of speechSynthesis.speak(new SpeechSynthesis.speak()). Using Native Messaging we start a local server, send input text or SSML to the local server with fetch(), pass the input data to local speech synthesis engine, in this case espeak-ng, get response back as WAV in the browser, which we parse to Float32Array and write to a MediaStreamTrackGenerator which we then output speakers and/or share with peers (https://github.com/guest271314/native-messaging-espeak-ng; https://github.com/espeak-ng/espeak-ng/tree/master/chromium_extension).
W3C Media Capture and Streams and Screen Capture specifications do not provide a means to capture entire system audio output ("What-U-Hear") output to speakers or headphones. Chrome authors decided to not allow capture of monitor devices on *nix machines. We capture output to speakers, stream that audio data to the browser directly, which we write to a MediaStreamTrackGenerator which we then record and/or share with peers (https://github.com/guest271314/captureSystemAudio).
Merge Matroska and WebM files (https://github.com/guest271314/native-messaging-mkvmerge).
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