SpeechRecognition-concurrentMediaStreamTrack-manual.https.html

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<!DOCTYPE html>

<html lang="en">

<title>SpeechRecognition Concurrent MediaStreamTracks</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;

    // Create two SpeechRecognition instances

    const speechRecognition1 = new SpeechRecognition();

    speechRecognition1.mode = 'cloud-only';

    speechRecognition1.lang = lang;

    const speechRecognition2 = new SpeechRecognition();

    speechRecognition2.mode = 'cloud-only';

    speechRecognition2.lang = lang;

    const audioTrack1 = await getAudioTrackFromFile("/media/speech.wav");

    const audioTrack2 = await getAudioTrackFromFile("/media/speech.wav");

    assert_true(audioTrack1 instanceof MediaStreamTrack, "Audio track 1 should be a valid MediaStreamTrack");

    assert_true(audioTrack2 instanceof MediaStreamTrack, "Audio track 2 should be a valid MediaStreamTrack");

    const recognitionPromise1 = new Promise((resolve) => {

        speechRecognition1.onresult = (event) => {

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

            resolve(transcript);

};

});

    const recognitionPromise2 = new Promise((resolve) => {

        speechRecognition2.onresult = (event) => {

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

            resolve(transcript);

};

});

    speechRecognition1.start(audioTrack1);

    speechRecognition2.start(audioTrack2);

    const transcript1 = await recognitionPromise1;

    const transcript2 = await recognitionPromise2;

    assert_equals(transcript1.toLowerCase(), "this is a sentence in a single segment", "Speech recognition 1 should correctly recognize speech");

    assert_equals(transcript2.toLowerCase(), "this is a sentence in a single segment", "Speech recognition 2 should correctly recognize speech");

}, "Two SpeechRecognition instances should simultaneously recognize speech from audio files.");

</script>

</html>