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Ensure rotation is always clockwise, make CanvasSink more powerful, disable rotation metadata for Matroska outputs, & other changes

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Vanilagy
2025-03-02 11:59:11 +01:00
parent 2ab385b16e
commit 453f8b6884
15 changed files with 304 additions and 200 deletions
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src/misc.ts
+10 -28
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@@ -7,7 +7,16 @@ export function assert(x: unknown): asserts x {
/** @public */
export type Rotation = 0 | 90 | 180 | 270;
/** @public */
export const normalizeRotation = (rotation: number) => {
const mappedRotation = (rotation % 360 + 360) % 360;
if (mappedRotation === 0 || mappedRotation === 90 || mappedRotation === 180 || mappedRotation === 270) {
return mappedRotation as Rotation;
} else {
throw new Error(`Invalid rotation ${rotation}.`);
}
};
export type TransformationMatrix = [number, number, number, number, number, number, number, number, number];
export const last = <T>(arr: T[]) => {
@@ -137,33 +146,6 @@ export class AsyncMutex {
}
}
export const rotationMatrix = (rotationInDegrees: number): TransformationMatrix => {
const theta = rotationInDegrees * (Math.PI / 180);
const cosTheta = Math.round(Math.cos(theta));
const sinTheta = Math.round(Math.sin(theta));
// Matrices are post-multiplied in ISOBMFF, meaning this is the transpose of your typical rotation matrix
return [
cosTheta, sinTheta, 0,
-sinTheta, cosTheta, 0,
0, 0, 1,
];
};
/** Extracts the rotation component from a transformation matrix, in degrees. */
export const extractRotationFromMatrix = (matrix: TransformationMatrix) => {
const [m11, , , m21] = matrix;
const scaleX = Math.hypot(m11, m21);
const cosTheta = m11 / scaleX;
const sinTheta = m21 / scaleX;
return Math.atan2(sinTheta, cosTheta) * (180 / Math.PI);
};
export const IDENTITY_MATRIX = rotationMatrix(0);
export const bytesToHexString = (bytes: Uint8Array) => {
return [...bytes].map(x => x.toString(16).padStart(2, '0')).join('');
};