/** FloorLog2 per spec 4.7: position of the most significant set bit. */
export declare function floorLog2(x: number): number;
/** CeilLog2 per spec: smallest n such that (1 << n) >= x, 0 for x < 2. */
export declare function ceilLog2(x: number): number;
export declare function clamp(value: number, low: number, high: number): number;
/**
 * MSB-first bit reader for AV1 uncompressed headers (OBU payloads).
 * Mirrors the BitReader conventions used in ts-heic's hevc/nal.ts, plus the
 * AV1-specific descriptors from spec section 4: f(n), uvlc(), le(n), leb128(),
 * su(n), ns(n).
 */
export declare class BitReader {
  constructor(data: Uint8Array);
  get bitPosition(): number;
  get bitsRemaining(): number;
  readBit(): number;
  readBits(n: number): number;
  uvlc(): number;
  le(n: number): number;
  leb128(): number;
  su(n: number): number;
  ns(n: number): number;
  byteAlign(): void;
}
/** MSB-first writer for AV1 uncompressed headers. */
export declare class BitWriter {
  get bitPosition(): number;
  writeBit(bit: number | boolean): void;
  writeBits(value: number, n: number): void;
  su(value: number, n: number): void;
  ns(value: number, n: number): void;
  byteAlign(): void;
  trailingBits(): void;
  finish(): Uint8Array;
}