Function encodeFramesToWebm

quote/quote.ts:948–991

(frames: Buffer[], fps = TG_STICKER_FPS)

    if (!message) return;
    (message.entities || []).forEach(scanEntity);
    (message.caption_entities || []).forEach(scanEntity);
    // Do not let sender emoji_status alone turn a pure-text quote into animated WebM.
    // It is already rendered from customEmojiCache as a static first frame.
    if (message.replyMessage) scanMessage(message.replyMessage);
    if (message.forward) scanMessage(message.forward);
  };
  messages.forEach(scanMessage);
  return Array.from(ids);
}

function applyCustomEmojiFrame(messages: any[], id: string, frame: Buffer): void {
  const applyEntity = (entity: any) => {
    if (String(entity?.custom_emoji_id || "") === id) entity.customEmojiBuffer = frame;
  };
  const scanMessage = (message: any) => {
    if (!message) return;
    (message.entities || []).forEach(applyEntity);
    (message.caption_entities || []).forEach(applyEntity);
    const statusId = message.from?.emoji_status?.custom_emoji_id || message.from?.emoji_status?.customEmojiId || message.emoji_status?.custom_emoji_id || message.emoji_status?.customEmojiId;
    if (String(statusId || "") === id) {
      if (message.from?.emoji_status) message.from.emoji_status.customEmojiBuffer = frame;
      if (message.emoji_status) message.emoji_status.customEmojiBuffer = frame;
    }
    if (message.replyMessage) scanMessage(message.replyMessage);
    if (message.forward) scanMessage(message.forward);
  };
  messages.forEach(scanMessage);
}

function isWebmBuffer(buffer: Buffer | undefined): boolean {
  return !!buffer && buffer.length >= 4 && buffer.subarray(0, 4).equals(Buffer.from([0x1a, 0x45, 0xdf, 0xa3]));
}

function isGifBuffer(buffer: Buffer | undefined): boolean {
  return !!buffer && buffer.length >= 6 && (buffer.subarray(0, 6).toString("ascii") === "GIF87a" || buffer.subarray(0, 6).toString("ascii") === "GIF89a");
}

function isAnimatedRasterBuffer(buffer: Buffer | undefined): boolean {
  return isWebmBuffer(buffer) || isGifBuffer(buffer);
}

function bufferKind(buffer: Buffer | undefined): string {
  if (!buffer) return "none";
  if (isGifBuffer(buffer)) return "gif";
  if (isWebmBuffer(buffer)) return "webm";
  if (buffer.length >= 8 && buffer.subarray(1, 4).toString("ascii") === "PNG") return "png";
  if (buffer[0] === 0xff && buffer[1] === 0xd8) return "jpg";