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feat(decoder): disable VSync

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Simon Chan 2023-01-20 14:02:44 +08:00
parent 7d1f271cdb
commit 849cb0c7fc
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1 changed files with 20 additions and 20 deletions
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40
libraries/scrcpy-decoder-webcodecs/src/index.ts
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@ -37,9 +37,8 @@ export class WebCodecsDecoder {
private context: CanvasRenderingContext2D;
private decoder: VideoDecoder;
// Limit FPS to system refresh rate
private lastFrame: VideoFrame | undefined;
private animationFrame = 0;
private currentFrameRendered = false;
private animationFrameId = 0;
public constructor() {
this._renderer = document.createElement("canvas");
@ -47,16 +46,21 @@ export class WebCodecsDecoder {
this.context = this._renderer.getContext("2d")!;
this.decoder = new VideoDecoder({
output: (frame) => {
if (this.lastFrame) {
if (this.currentFrameRendered) {
this._frameSkipped += 1;
this.lastFrame.close();
} else {
this.currentFrameRendered = true;
this._frameRendered += 1;
}
this.lastFrame = frame;
if (!this.animationFrame) {
// Start render loop on first frame
this.render();
}
// PERF: H.264 renderer may draw multiple frames in one vertical sync interval to minimize latency.
// When multiple frames are drawn in one vertical sync interval,
// only the last one is visible to users.
// But this ensures users can always see the most up-to-date screen.
// This is also the behavior of official Scrcpy client.
// https://github.com/Genymobile/scrcpy/issues/3679
this.context.drawImage(frame, 0, 0);
frame.close();
},
error(e) {
void e;
@ -83,17 +87,13 @@ export class WebCodecsDecoder {
}
},
});
this.onFramePresented();
}
private render = () => {
if (this.lastFrame) {
this._frameRendered += 1;
this.context.drawImage(this.lastFrame, 0, 0);
this.lastFrame.close();
this.lastFrame = undefined;
}
this.animationFrame = requestAnimationFrame(this.render);
private onFramePresented = () => {
this.currentFrameRendered = false;
this.animationFrameId = requestAnimationFrame(this.onFramePresented);
};
private configure(config: H264Configuration) {
@ -114,7 +114,7 @@ export class WebCodecsDecoder {
}
public dispose() {
cancelAnimationFrame(this.animationFrame);
cancelAnimationFrame(this.animationFrameId);
this.decoder.close();
}
}