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import {
Output,
Mp4OutputFormat,
WebMOutputFormat,
BufferTarget,
CanvasSource,
QUALITY_LOW,
QUALITY_MEDIUM,
QUALITY_HIGH,
QUALITY_VERY_HIGH,
} from "mediabunny";
import { renderTimelineFrame } from "./timeline-renderer";
import { useTimelineStore } from "@/stores/timeline-store";
import { useMediaStore } from "@/stores/media-store";
import { useProjectStore } from "@/stores/project-store";
import { DEFAULT_FPS } from "@/stores/project-store";
import { ExportOptions, ExportResult } from "@/types/export";
export const DEFAULT_EXPORT_OPTIONS: ExportOptions = {
format: "mp4",
quality: "high",
};
const qualityMap = {
low: QUALITY_LOW,
medium: QUALITY_MEDIUM,
high: QUALITY_HIGH,
very_high: QUALITY_VERY_HIGH,
};
export async function exportProject(
options: ExportOptions
): Promise<ExportResult> {
const { format, quality, fps, onProgress, onCancel } = options;
try {
const timelineStore = useTimelineStore.getState();
const mediaStore = useMediaStore.getState();
const projectStore = useProjectStore.getState();
const { tracks, getTotalDuration } = timelineStore;
const { mediaFiles } = mediaStore;
const { activeProject } = projectStore;
if (!activeProject) {
return { success: false, error: "No active project" };
}
const duration = getTotalDuration();
if (duration === 0) {
return { success: false, error: "Project is empty" };
}
const exportFps = fps || activeProject.fps || DEFAULT_FPS;
const canvasSize = activeProject.canvasSize;
const outputFormat =
format === "webm" ? new WebMOutputFormat() : new Mp4OutputFormat();
// BufferTarget for smaller files, StreamTarget for larger ones
// TODO: Implement StreamTarget
const output = new Output({
format: outputFormat,
target: new BufferTarget(),
});
// Canvas for rendering
const canvas = document.createElement("canvas");
canvas.width = canvasSize.width;
canvas.height = canvasSize.height;
const ctx = canvas.getContext("2d");
if (!ctx) {
return { success: false, error: "Failed to create canvas context" };
}
const videoSource = new CanvasSource(canvas, {
codec: format === "webm" ? "vp9" : "avc", // VP9 for WebM, H.264 for MP4
bitrate: qualityMap[quality],
});
output.addVideoTrack(videoSource, { frameRate: exportFps });
// Start the output
await output.start();
const totalFrames = Math.ceil(duration * exportFps);
let cancelled = false;
// Render each frame
for (let frameIndex = 0; frameIndex < totalFrames; frameIndex++) {
// Check for cancellation
if (onCancel?.()) {
cancelled = true;
break;
}
const time = frameIndex / exportFps;
await renderTimelineFrame({
ctx,
time,
canvasWidth: canvas.width,
canvasHeight: canvas.height,
tracks,
mediaFiles,
backgroundColor:
activeProject.backgroundType === "blur"
? "transparent"
: activeProject.backgroundColor || "#000000",
projectCanvasSize: canvasSize,
});
const frameDuration = 1 / exportFps;
await videoSource.add(time, frameDuration);
onProgress?.(frameIndex / totalFrames);
}
if (cancelled) {
await output.cancel();
return { success: false, cancelled: true };
}
videoSource.close();
await output.finalize();
onProgress?.(1);
return {
success: true,
buffer: output.target.buffer || undefined,
};
} catch (error) {
console.error("Export failed:", error);
return {
success: false,
error: error instanceof Error ? error.message : "Unknown export error",
};
}
}
export function getExportMimeType(format: "mp4" | "webm"): string {
return format === "webm" ? "video/webm" : "video/mp4";
}
export function getExportFileExtension(format: "mp4" | "webm"): string {
return `.${format}`;
}
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