1 files changed, 55 insertions, 0 deletions
diff --git a/src/lib/Player/Video.ts b/src/lib/Player/Video.ts
new file mode 100644
index 0000000..78b3b8f
--- /dev/null
+++ b/src/lib/Player/Video.ts
@@ -0,0 +1,55 @@
+export type FrameTime = {
+  milliseconds: number,
+  seconds: number,
+  frames: number
+}
+export abstract class Video {
+  public constructor(public canvas: HTMLCanvasElement) { };
+  public abstract renderFrame(time: FrameTime): Promise<void> | void;
+  /** (re-)Initializes the Video object. Also called on window resizes. */
+  public abstract init(): void | Promise<void>;
+  private _isInit = false;
+  /** The frames per second to render at */
+  public abstract get fps(): number;
+  /** Length in frames */
+  public abstract get length(): number;
+  /** A URL (and matching filename) to an ffmpeg-compatible audio file */
+  public audioUrl?: readonly [filename: string, fileUrl: string];
+  /** Resizes the canvas to a predetermined render resolution - must only be called in init() - do not overwrite */
+  public resize(x: number, y: number) {
+    if (!this._isInit) throw new Error('Must only call resize() in init.')
+    this.canvas.width = x;
+    this.canvas.height = y;
+    const parentW = this.canvas.parentElement!.clientWidth,
+      parentH = this.canvas.parentElement!.clientHeight
+    if (x <= parentW && y <= parentH) {
+      this.canvas.style.width = `${x}px`;
+      this.canvas.style.height = `${y}px`;
+    } else if (x <= parentW && y > parentH) {
+      this.canvas.style.width = `${x / y * parentH}px`;
+      this.canvas.style.height = `${parentH}px`;
+    } else if (y <= parentH && x > parentW) {
+      this.canvas.style.width = `${parentW}px`;
+      this.canvas.style.height = `${y / x * parentW}px`;
+    } else {
+      if ((parentW / x) * y > parentH) {
+        this.canvas.style.width = `${(parentH / y) * x}px`
+        this.canvas.style.height = `${parentH}px`
+      } else {
+        this.canvas.style.width = `${parentW}px`
+        this.canvas.style.height = `${(parentW / x) * y}px`
+      }
+    }
+  }
+  /** The width of the video, in pixels */
+  public get w() {
+    return this.canvas.width;
+  }
+  /** The height of the video, in pixels */
+  public get h() {
+    return this.canvas.height;
+  }
+  /** Use to cleanup any mess you made - do not remove the canvas, it may be reused. */
+  public cleanup() { };
+}
+export type VideoConstructor = new (...params: ConstructorParameters<typeof Video>) => Video