1 files changed, 209 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webcodecs/utils.js b/testing/web-platform/tests/webcodecs/utils.js
new file mode 100644
index 0000000000..aea658d3f2
--- /dev/null
+++ b/testing/web-platform/tests/webcodecs/utils.js
@@ -0,0 +1,209 @@
+function make_audio_data(timestamp, channels, sampleRate, frames) {
+
+  let data = new Float32Array(frames*channels);
+
+  // This generates samples in a planar format.
+  for (var channel = 0; channel < channels; channel++) {
+    let hz = 100 + channel * 50; // sound frequency
+    let base_index = channel * frames;
+    for (var i = 0; i < frames; i++) {
+      let t = (i / sampleRate) * hz * (Math.PI * 2);
+      data[base_index + i] = Math.sin(t);
+    }
+  }
+
+  return new AudioData({
+    timestamp: timestamp,
+    data: data,
+    numberOfChannels: channels,
+    numberOfFrames: frames,
+    sampleRate: sampleRate,
+    format: "f32-planar",
+  });
+}
+
+function makeOffscreenCanvas(width, height, options) {
+  let canvas = new OffscreenCanvas(width, height);
+  let ctx = canvas.getContext('2d', options);
+  ctx.fillStyle = 'rgba(50, 100, 150, 255)';
+  ctx.fillRect(0, 0, width, height);
+  return canvas;
+}
+
+function makeImageBitmap(width, height) {
+  return makeOffscreenCanvas(width, height).transferToImageBitmap();
+}
+
+// Gives a chance to pending output and error callbacks to complete before
+// resolving.
+function endAfterEventLoopTurn() {
+  return new Promise(resolve => step_timeout(resolve, 0));
+}
+
+// Returns a codec initialization with callbacks that expected to not be called.
+function getDefaultCodecInit(test) {
+  return {
+    output: test.unreached_func("unexpected output"),
+    error: test.unreached_func("unexpected error"),
+  }
+}
+
+// Checks that codec can be configured, reset, reconfigured, and that incomplete
+// or invalid configs throw errors immediately.
+function testConfigurations(codec, validCondig, invalidCodecs) {
+  assert_equals(codec.state, "unconfigured");
+
+  const requiredConfigPairs = validCondig;
+  let incrementalConfig = {};
+
+  for (let key in requiredConfigPairs) {
+    // Configure should fail while required keys are missing.
+    assert_throws_js(TypeError, () => { codec.configure(incrementalConfig); });
+    incrementalConfig[key] = requiredConfigPairs[key];
+    assert_equals(codec.state, "unconfigured");
+  }
+
+  // Configure should pass once incrementalConfig meets all requirements.
+  codec.configure(incrementalConfig);
+  assert_equals(codec.state, "configured");
+
+  // We should be able to reconfigure the codec.
+  codec.configure(incrementalConfig);
+  assert_equals(codec.state, "configured");
+
+  let config = incrementalConfig;
+
+  invalidCodecs.forEach(badCodec => {
+    // Invalid codecs should fail.
+    config.codec = badCodec;
+    assert_throws_js(TypeError, () => { codec.configure(config); }, badCodec);
+  })
+
+  // The failed configures should not affect the current config.
+  assert_equals(codec.state, "configured");
+
+  // Test we can configure after a reset.
+  codec.reset()
+  assert_equals(codec.state, "unconfigured");
+
+  codec.configure(validCondig);
+  assert_equals(codec.state, "configured");
+}
+
+// Performs an encode or decode with the provided input, depending on whether
+// the passed codec is an encoder or a decoder.
+function encodeOrDecodeShouldThrow(codec, input) {
+  // We are testing encode/decode on codecs in invalid states.
+  assert_not_equals(codec.state, "configured");
+
+  if (codec.decode) {
+    assert_throws_dom("InvalidStateError",
+                      () => codec.decode(input),
+                      "decode");
+  } else if (codec.encode) {
+    // Encoders consume frames, so clone it to be safe.
+    assert_throws_dom("InvalidStateError",
+                  () => codec.encode(input.clone()),
+                  "encode");
+
+  } else {
+    assert_unreached("Codec should have encode or decode function");
+  }
+}
+
+// Makes sure that we cannot close, configure, reset, flush, decode or encode a
+// closed codec.
+function testClosedCodec(test, codec, validconfig, codecInput) {
+  assert_equals(codec.state, "unconfigured");
+
+  codec.close();
+  assert_equals(codec.state, "closed");
+
+  assert_throws_dom("InvalidStateError",
+                    () => codec.configure(validconfig),
+                    "configure");
+  assert_throws_dom("InvalidStateError",
+                    () => codec.reset(),
+                    "reset");
+  assert_throws_dom("InvalidStateError",
+                    () => codec.close(),
+                    "close");
+
+  encodeOrDecodeShouldThrow(codec, codecInput);
+
+  return promise_rejects_dom(test, 'InvalidStateError', codec.flush(), 'flush');
+}
+
+// Makes sure we cannot flush, encode or decode with an unconfigured coded, and
+// that reset is a valid no-op.
+function testUnconfiguredCodec(test, codec, codecInput) {
+  assert_equals(codec.state, "unconfigured");
+
+  // Configure() and Close() are valid operations that would transition us into
+  // a different state.
+
+  // Resetting an unconfigured encoder is a no-op.
+  codec.reset();
+  assert_equals(codec.state, "unconfigured");
+
+  encodeOrDecodeShouldThrow(codec, codecInput);
+
+  return promise_rejects_dom(test, 'InvalidStateError', codec.flush(), 'flush');
+}
+
+// Reference values generated by:
+// https://fiddle.skia.org/c/f100d4d5f085a9e09896aabcbc463868
+
+const kSRGBPixel = [50, 100, 150, 255];
+const kP3Pixel = [62, 99, 146, 255];
+const kRec2020Pixel = [87, 106, 151, 255];
+
+const kCanvasOptionsP3Uint8 = {
+  colorSpace: 'display-p3',
+  pixelFormat: 'uint8'
+};
+
+const kImageSettingOptionsP3Uint8 = {
+  colorSpace: 'display-p3',
+  storageFormat: 'uint8'
+};
+
+const kCanvasOptionsRec2020Uint8 = {
+  colorSpace: 'rec2020',
+  pixelFormat: 'uint8'
+};
+
+const kImageSettingOptionsRec2020Uint8 = {
+  colorSpace: 'rec2020',
+  storageFormat: 'uint8'
+};
+
+function testCanvas(ctx, width, height, expected_pixel, imageSetting, assert_compares) {
+  // The dup getImageData is to workaournd crbug.com/1100233
+  let imageData = ctx.getImageData(0, 0, width, height, imageSetting);
+  let colorData = ctx.getImageData(0, 0, width, height, imageSetting).data;
+  const kMaxPixelToCheck = 128 * 96;
+  let step = width * height / kMaxPixelToCheck;
+  step = Math.round(step);
+  step = (step < 1) ? 1 : step;
+  for (let i = 0; i < 4 * width * height; i += (4 * step)) {
+    assert_compares(colorData[i], expected_pixel[0]);
+    assert_compares(colorData[i + 1], expected_pixel[1]);
+    assert_compares(colorData[i + 2], expected_pixel[2]);
+    assert_compares(colorData[i + 3], expected_pixel[3]);
+  }
+}
+
+function makeDetachedArrayBuffer() {
+  const buffer = new ArrayBuffer(10);
+  const view = new Uint8Array(buffer);
+  new MessageChannel().port1.postMessage(buffer, [buffer]);
+  return view;
+}
+
+function isFrameClosed(frame) {
+  return frame.format == null && frame.codedWidth == 0 &&
+         frame.codedHeight == 0 && frame.displayWidth == 0 &&
+         frame.displayHeight == 0 && frame.codedRect == null &&
+         frame.visibleRect == null;
+}