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const I420_DATA = new Uint8Array([
1, 2, 3, 4, // y
5, 6, 7, 8,
9, 10, // u
11, 12, // v
]);
function makeI420_4x2() {
const init = {
format: 'I420',
timestamp: 0,
codedWidth: 4,
codedHeight: 2,
};
return new VideoFrame(I420_DATA, init);
}
function testBufferConstructedI420Frame(bufferType) {
let fmt = 'I420';
let vfInit = {format: fmt, timestamp: 1234, codedWidth: 4, codedHeight: 2};
let buffer;
if (bufferType == 'SharedArrayBuffer' ||
bufferType == 'Uint8Array(SharedArrayBuffer)') {
buffer = new SharedArrayBuffer(I420_DATA.length);
} else {
assert_true(bufferType == 'ArrayBuffer' ||
bufferType == 'Uint8Array(ArrayBuffer)');
buffer = new ArrayBuffer(I420_DATA.length);
}
let bufferView = new Uint8Array(buffer);
bufferView.set(I420_DATA);
let data = bufferType.startsWith('Uint8Array') ? bufferView : buffer;
let frame = new VideoFrame(data, vfInit);
assert_equals(frame.format, fmt, 'plane format');
assert_equals(frame.colorSpace.primaries, 'bt709', 'color primaries');
assert_equals(frame.colorSpace.transfer, 'bt709', 'color transfer');
assert_equals(frame.colorSpace.matrix, 'bt709', 'color matrix');
assert_false(frame.colorSpace.fullRange, 'color range');
frame.close();
let y = {offset: 0, stride: 4};
let u = {offset: 8, stride: 2};
let v = {offset: 10, stride: 2};
assert_throws_js(TypeError, () => {
let y = {offset: 0, stride: 1};
let frame = new VideoFrame(data, {...vfInit, layout: [y, u, v]});
}, 'y stride too small');
assert_throws_js(TypeError, () => {
let u = {offset: 8, stride: 1};
let frame = new VideoFrame(data, {...vfInit, layout: [y, u, v]});
}, 'u stride too small');
assert_throws_js(TypeError, () => {
let v = {offset: 10, stride: 1};
let frame = new VideoFrame(data, {...vfInit, layout: [y, u, v]});
}, 'v stride too small');
assert_throws_js(TypeError, () => {
let frame = new VideoFrame(data.slice(0, 8), vfInit);
}, 'data too small');
}
function assert_buffer_equals(actual, expected) {
assert_true(expected instanceof Uint8Array, 'actual instanceof Uint8Array');
if (actual instanceof ArrayBuffer ||
(typeof(SharedArrayBuffer) != 'undefined' &&
actual instanceof SharedArrayBuffer)) {
actual = new Uint8Array(actual);
} else {
assert_true(actual instanceof Uint8Array,
'expected instanceof Uint8Array, ArrayBuffer, or SharedArrayBuffer');
}
assert_equals(actual.length, expected.length, 'buffer length');
for (let i = 0; i < actual.length; i++) {
if (actual[i] != expected[i]) {
assert_equals(actual[i], expected[i], 'buffer contents at index ' + i);
}
}
}
function assert_layout_equals(actual, expected) {
assert_equals(actual.length, expected.length, 'layout planes');
for (let i = 0; i < actual.length; i++) {
assert_object_equals(actual[i], expected[i], 'plane ' + i + ' layout');
}
}
async function testI420_4x2_copyTo(destination) {
const frame = makeI420_4x2();
const expectedLayout = [
{offset: 0, stride: 4},
{offset: 8, stride: 2},
{offset: 10, stride: 2},
];
const expectedData = new Uint8Array([
1, 2, 3, 4, // y
5, 6, 7, 8,
9, 10, // u
11, 12 // v
]);
assert_equals(frame.allocationSize(), expectedData.length, 'allocationSize()');
const layout = await frame.copyTo(destination);
assert_layout_equals(layout, expectedLayout);
assert_buffer_equals(destination, expectedData);
}
function verifyTimestampRequiredToConstructFrame(imageSource) {
assert_throws_js(
TypeError,
() => new VideoFrame(imageSource),
'timestamp required to construct VideoFrame from this source');
let validFrame = new VideoFrame(imageSource, {timestamp: 0});
validFrame.close();
}
// Fills a visible region within `data` with the given YUV values.
function fillYUV(data, codedWidth, codedHeight, visibleRect, v_y, v_u, v_v) {
for (let y = 0; y < codedHeight; y++) {
for (let x = 0; x < codedWidth; x++) {
data[y * codedWidth + x] =
(x >= visibleRect.x && y < visibleRect.y + visibleRect.height) ? v_y
: 0;
}
}
const uvWidth = codedWidth / 2;
const uvHeight = codedHeight / 2;
const uvPlaneSize = uvWidth * uvHeight;
const uvOffset = codedWidth * codedHeight;
const uvX = visibleRect.x / 2;
const uvMaxY = (visibleRect.y + visibleRect.height) / 2;
for (let y = 0; y < uvHeight; y++) {
for (let x = 0; x < uvWidth; x++) {
if (x >= uvX && y < uvMaxY) {
data[uvOffset + y * uvWidth + x] = v_u;
data[uvOffset + uvPlaneSize + y * uvWidth + x] = v_v;
} else {
data[uvOffset + y * uvWidth + x] =
data[uvOffset + uvPlaneSize + y * uvWidth + x] = 128;
}
}
}
}
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