SpeechRecognition-mediaStreamTrack-manual.https.html

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<!DOCTYPE html>

<html lang="en">

<title>SpeechRecognition MediaStreamTrack</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

async function getAudioTrackFromFile(filePath) {

    const audioContext = new AudioContext();

    const response = await fetch(filePath);

    const arrayBuffer = await response.arrayBuffer();

    const audioBuffer = await audioContext.decodeAudioData(arrayBuffer);

    const source = audioContext.createBufferSource();

    source.buffer = audioBuffer;

    const destination = audioContext.createMediaStreamDestination();

    source.connect(destination);

    source.start();

    return destination.stream.getAudioTracks()[0];

promise_test(async (t) => {

    const lang = "en-US";

    window.SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;

    const speechRecognition = new SpeechRecognition();

    speechRecognition.mode = 'cloud-only';

    speechRecognition.lang = lang;

    const audioTrack = await getAudioTrackFromFile("/media/speech.wav");

    assert_true(audioTrack instanceof MediaStreamTrack, "Audio track should be a valid MediaStreamTrack");

    const recognitionPromise = new Promise((resolve) => {

        speechRecognition.onresult = (event) => {

            const transcript = event.results[0][0].transcript;

            resolve(transcript);

};

});

    speechRecognition.start(audioTrack);

    const transcript = await recognitionPromise;

    assert_equals(transcript.toLowerCase(), "this is a sentence in a single segment", "Speech recognition should correctly recognize 'hello world'");

    // Start speech recognition without a media stream track on the same instance should fail.

    try {

      speechRecognition.start();

      assert_unreached();

    } catch (e) {

      assert_equals(e.name, "InvalidStateError", "Second call to start() should throw an InvalidStateError");

}, "SpeechRecognition should recognize speech from an audio file.");

</script>

</html>