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// META: title=MediaStreamTrackProcessor tests.
importScripts("/resources/testharness.js");
function makeVideoFrame(timestamp) {
const canvas = new OffscreenCanvas(100, 100);
const ctx = canvas.getContext('2d');
return new VideoFrame(canvas, {timestamp});
}
promise_test(async t => {
// The generator will be used as the source for the processor to
// produce frames in a controlled manner.
const generator = new VideoTrackGenerator();
t.add_cleanup(() => generator.track.stop());
// Use a larger maxBufferSize than the default to ensure no frames
// will be dropped.
const processor = new MediaStreamTrackProcessor({track: generator.track, maxBufferSize:10});
const reader = processor.readable.getReader();
const writer = generator.writable.getWriter();
let numReads = 0;
let resolve = null;
const promise = new Promise(r => resolve = r);
const numOperations = 4;
// Issue reads without waiting for the frames to arrive.
for (let i = 0; i < numOperations; i++) {
reader.read().then(dv=> {
dv.value.close();
if (++numReads == numOperations)
resolve();
});
}
// Write video frames in different tasks to "slowly" settle the pending read
// requests.
for (let i = 0; i<numOperations; i++) {
await writer.write(makeVideoFrame(i));
await new Promise(r=>t.step_timeout(r,0));
}
return promise;
}, "Tests that multiple read requests are eventually settled");
done();
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