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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.processLocally = false;
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>
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