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<!DOCTYPE html>
<html lang="en">
<title>SpeechRecognition Phrases</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) => {
// Verify the audio track for recognition context exists.
const audioTrack = await getAudioTrackFromFile("/media/recognition_context.mp3");
assert_true(
audioTrack instanceof MediaStreamTrack,
"Audio track should be a valid MediaStreamTrack"
);
// Create the first speech recognition with a mode that does not support contextual biasing.
// Note that this may vary between browsers in the future.
window.SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
const recognition1 = new SpeechRecognition();
recognition1.mode = "cloud-only";
recognition1.lang = "en-US";
recognition1.onerror = function(event) {
assert_equals(
event.error,
"phrases-not-supported",
"First speech recognition should throw a phrases-not-supported error"
);
};
recognition1.phrases = new SpeechRecognitionPhraseList([
new SpeechRecognitionPhrase("test", 1.0)
]);
// Create the second speech recognition with a mode that supports contextual biasing.
const recognition2 = new SpeechRecognition();
recognition2.mode = "ondevice-only";
recognition2.lang = "en-US";
recognition2.onerror = function(event) {
// Currently WPT may not be able to detect that SODA is available and
// will throw a "language-not-supported" error here.
assert_unreached("Caught an error: " + event.error);
};
recognition2.phrases = new SpeechRecognitionPhraseList([
new SpeechRecognitionPhrase("ASIC", 1.0),
new SpeechRecognitionPhrase("FPGA", 1.0)
]);
const recognitionPromise = new Promise((resolve) => {
recognition2.onresult = (event) => {
const transcript = event.results[0][0].transcript;
resolve(transcript);
};
});
recognition2.start(audioTrack);
const transcript = await recognitionPromise;
assert_equals(
transcript.toLowerCase(),
"the report confirmed that the asic's throughput and " +
"the fpga's latency were both below expectations",
"Second speech recognition should correctly recognize the phrases"
);
}, "SpeechRecognition should recognize speech with the given contextual information.");
</script>
</html>
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