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import EventEmitter from "eventemitter3";
import type { FrameRate } from "opencut-wasm";
import { TICKS_PER_SECOND } from "@/wasm";
import { frameRateToFloat } from "@/fps/utils";
import { getDesktopBridge } from "@/desktop/bridge";
import type { ExportFormat, ExportQuality } from "@/export";
import { CanvasRenderer } from "./canvas-renderer";
import type { RootNode } from "./nodes/root-node";
type NativeExportParams = {
width: number;
height: number;
fps: FrameRate;
format: ExportFormat;
quality: ExportQuality;
shouldIncludeAudio?: boolean;
audioBuffer?: AudioBuffer;
fileName: string;
};
export type NativeExporterEvents = {
progress: [progress: number];
complete: [];
error: [error: Error];
cancelled: [];
};
export class NativeExporter extends EventEmitter<NativeExporterEvents> {
private renderer: CanvasRenderer;
private format: ExportFormat;
private quality: ExportQuality;
private shouldIncludeAudio: boolean;
private audioBuffer?: AudioBuffer;
private fileName: string;
private isCancelled = false;
constructor({
width,
height,
fps,
format,
quality,
shouldIncludeAudio,
audioBuffer,
fileName,
}: NativeExportParams) {
super();
this.renderer = new CanvasRenderer({
width,
height,
fps,
});
this.format = format;
this.quality = quality;
this.shouldIncludeAudio = shouldIncludeAudio ?? false;
this.audioBuffer = audioBuffer;
this.fileName = fileName;
}
cancel(): void {
this.isCancelled = true;
}
private buildAudioPcm(): Float32Array | null {
if (!this.shouldIncludeAudio || !this.audioBuffer) return null;
const { numberOfChannels, length } = this.audioBuffer;
const pcm = new Float32Array(length * numberOfChannels);
for (let channel = 0; channel < numberOfChannels; channel++) {
const channelData = this.audioBuffer.getChannelData(channel);
for (let i = 0; i < length; i++) {
pcm[i * numberOfChannels + channel] = channelData[i];
}
}
return pcm;
}
async export({ rootNode }: { rootNode: RootNode }): Promise<string | null> {
const bridge = getDesktopBridge();
if (!bridge) {
throw new Error("Desktop bridge is not available");
}
const fps = this.renderer.fps;
const fpsFloat = frameRateToFloat(fps);
const ticksPerFrame = Math.round(
(TICKS_PER_SECOND * fps.denominator) / fps.numerator,
);
const frameCount = Math.floor(rootNode.duration / ticksPerFrame);
const pcm = this.buildAudioPcm();
const begin = await bridge.exportBegin({
width: this.renderer.width,
height: this.renderer.height,
fpsNumerator: fps.numerator,
fpsDenominator: fps.denominator,
format: this.format,
quality: this.quality,
hasAudio: pcm !== null,
sampleRate: this.audioBuffer?.sampleRate ?? 48000,
channels: this.audioBuffer?.numberOfChannels ?? 2,
defaultFileName: this.fileName,
});
if (!begin) {
this.emit("cancelled");
return null;
}
const { id, filePath } = begin;
try {
if (pcm) {
await bridge.exportWriteAudio(id, pcm.buffer as ArrayBuffer);
}
for (let i = 0; i < frameCount; i++) {
if (this.isCancelled) {
await bridge.exportCancel(id);
this.emit("cancelled");
return null;
}
const timeTicks = i * ticksPerFrame;
await this.renderer.render({ node: rootNode, time: timeTicks });
const frame = new VideoFrame(this.renderer.getOutputCanvas(), {
timestamp: Math.round((i * 1e6) / fpsFloat),
duration: Math.round(1e6 / fpsFloat),
});
const size = frame.allocationSize({ format: "RGBA" });
const buffer = new ArrayBuffer(size);
await frame.copyTo(buffer, { format: "RGBA" });
frame.close();
await bridge.exportWriteFrame(id, buffer);
this.emit("progress", i / frameCount);
}
if (this.isCancelled) {
await bridge.exportCancel(id);
this.emit("cancelled");
return null;
}
await bridge.exportFinish(id);
this.emit("progress", 1);
this.emit("complete");
return filePath;
} catch (error) {
await bridge.exportCancel(id).catch(() => {});
throw error;
}
}
}
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