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Add ProRes encode and decode support to @mediabunny/server

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This commit is contained in:
Vanilagy
2026-06-30 21:40:58 +02:00
parent b4ef20cd36
commit 7d89c8de2d
18 changed files with 383 additions and 27 deletions
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src/codec.ts
+35 -2
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@@ -227,7 +227,23 @@ export const PRORES_FOURCCS = [
] as const;
export type ProresFourCc = typeof PRORES_FOURCCS[number];
export const buildVideoCodecString = (codec: VideoCodec, width: number, height: number, bitrate: number) => {
// Target data rates of the ProRes profiles at 1920x1080 ~30fps, as published by Apple
const PRORES_PROFILE_TARGET_BITRATES: { fourCc: ProresFourCc; bitrate: number; alpha: boolean }[] = [
{ fourCc: 'apco', bitrate: 45_000_000, alpha: false }, // 422 Proxy
{ fourCc: 'apcs', bitrate: 102_000_000, alpha: false }, // 422 LT
{ fourCc: 'apcn', bitrate: 147_000_000, alpha: false }, // 422 Standard
{ fourCc: 'apch', bitrate: 220_000_000, alpha: false }, // 422 HQ
{ fourCc: 'ap4h', bitrate: 330_000_000, alpha: true }, // 4444
{ fourCc: 'ap4x', bitrate: 500_000_000, alpha: true }, // 4444 XQ
];
export const buildVideoCodecString = (
codec: VideoCodec,
width: number,
height: number,
bitrate: number,
alpha: boolean,
) => {
if (codec === 'avc') {
const profileIndication = 0x64; // High Profile
const totalMacroblocks = Math.ceil(width / 16) * Math.ceil(height / 16);
@@ -287,7 +303,22 @@ export const buildVideoCodecString = (codec: VideoCodec, width: number, height:
return `av01.${profile}.${level}${levelInfo.tier}.${bitDepth}`;
} else if (codec === 'prores') {
return 'apch';
const referencePixels = 1920 * 1080;
const scaleFactor = Math.pow((width * height) / referencePixels, 0.95);
const candidates = PRORES_PROFILE_TARGET_BITRATES.filter(x => x.alpha === alpha);
let bestFourCc = candidates[0]!.fourCc;
let smallestDifference = Infinity;
for (const { fourCc, bitrate: targetBitrate } of candidates) {
const difference = Math.abs(targetBitrate * scaleFactor - bitrate);
if (difference < smallestDifference) {
smallestDifference = difference;
bestFourCc = fourCc;
}
}
return bestFourCc;
} else {
assertNever(codec);
}
@@ -700,6 +731,8 @@ export const inferCodecFromCodecString = (codecString: string): MediaCodec | nul
return 'vp9';
} else if (codecString.startsWith('av01')) {
return 'av1';
} else if ((PRORES_FOURCCS as readonly string[]).includes(codecString)) {
return 'prores';
}
// Audio codecs