/** decode_subexp + inv_recenter, used by delta-q/lf and restoration filters. */
export declare function decodeSubexp(s: SymbolDecoder, ref: number, n: number, k: number): number;
/** AV1 multi-symbol arithmetic encoder, the inverse of `SymbolDecoder`. */
export declare class SymbolEncoder {
  readonly allowUpdateCdf: boolean;
  constructor(disableCdfUpdate: boolean);
  encodeSymbol(cdf: Uint16Array, off: number, nSymbolsMinus1: number, symbol: number): void;
  encodeBool(bit: number, f: number): void;
  encodeBoolAdapt(cdf: Uint16Array, off: number, bit: number): void;
  encodeBoolEqui(bit: number): void;
  writeLiteral(value: number, bits: number): void;
  writeGolomb(value: number): void;
  finish(): Uint8Array;
}
export declare class SymbolDecoder {
  readonly allowUpdateCdf: boolean;
  constructor(data: Uint8Array, disableCdfUpdate: boolean);
  decodeSymbol(cdf: Uint16Array, off: number, nSymbolsMinus1: number): number;
  decodeBool(f: number): number;
  decodeBoolAdapt(cdf: Uint16Array, off: number): number;
  decodeBoolEqui(): number;
  readLiteral(n: number): number;
  decodeUniform(n: number): number;
  readGolomb(): number;
  get bitsConsumed(): number;
}