/**
 * MPEG-1/2/2.5 Layer III constant tables, from ISO/IEC 11172-3 and 13818-3.
 *
 * These are specification data, not design decisions — the values are fixed by
 * the format and every conforming decoder uses exactly these. They live in their
 * own module so the `audiobox/mp3` bundle only pays for them when MP3 is
 * actually used.
 *
 * Where a table can be *computed* rather than listed, it is: the requantization
 * power table, the IMDCT windows, and the synthesis cosine matrix are all
 * generated at module load. That is a few microseconds of arithmetic in exchange
 * for several kilobytes of literals in every bundle, and it removes an entire
 * category of transcription error.
 */
/** Scalefactor band boundaries for long blocks, per sample rate. 22 bands + end. */
export declare const SFB_LONG: Record<number, Int16Array>;
/** Scalefactor band boundaries for short blocks, per sample rate. 13 bands + end. */
export declare const SFB_SHORT: Record<number, Int16Array>;
/**
 * Scalefactor bit lengths, selected by `scalefac_compress` (MPEG-1 only).
 *
 * `slen1` applies to bands 0–10, `slen2` to bands 11–20.
 */
export declare const SLEN1: Uint8Array<ArrayBuffer>;
export declare const SLEN2: Uint8Array<ArrayBuffer>;
/**
 * Additional high-frequency emphasis, applied when `preflag` is set.
 *
 * A cheap way for the encoder to boost the top bands without spending
 * scalefactor bits on them.
 */
export declare const PRETAB: Uint8Array<ArrayBuffer>;
/** How many scalefactor bands each of the two MPEG-1 groups covers. */
export declare const SFB_GROUP_BOUNDARY = 11;
/**
 * Number of linearly-coded extra bits for Huffman tables 16–31.
 *
 * Large values are coded as a Huffman escape followed by this many raw bits, so
 * the tables stay small while still covering the full dynamic range.
 */
export declare const HUFFMAN_LINBITS: Uint8Array<ArrayBuffer>;
/**
 * `x^(4/3)` for every quantized magnitude, precomputed.
 *
 * Requantization applies this to every one of 576 lines per granule, tens of
 * thousands of times per second of audio. `Math.pow` in that loop is the single
 * biggest avoidable cost in an MP3 decoder.
 *
 * 8207 entries covers the largest value representable with 13 linbits.
 */
export declare const POW43: Float32Array<ArrayBuffer>;
/**
 * `2^(i/4)` for the global gain exponent, offset so the index is never negative.
 *
 * `global_gain` is 8 bits and the exponent it produces spans roughly -256..+118,
 * so the table is offset by 256.
 */
export declare const GAIN_POW2: Float32Array<ArrayBuffer>;
/**
 * The four IMDCT window shapes.
 *
 * Layer III switches between a 36-sample long window and three 12-sample short
 * windows to control pre-echo — a long window smears a sharp transient's
 * quantization noise backwards in time, which is audible as a click before a
 * drum hit. Types 1 and 3 are the asymmetric transitions between the two.
 */
export declare const IMDCT_WINDOWS: Float32Array<ArrayBufferLike>[];
/**
 * Alias-reduction butterfly coefficients.
 *
 * The polyphase filterbank's sub-bands overlap, which introduces aliasing
 * between neighbours. These eight butterflies across each sub-band boundary
 * cancel it. Derived from the specification's `c[]` constants.
 */
export declare const ALIAS_CS: Float32Array<ArrayBuffer>;
export declare const ALIAS_CA: Float32Array<ArrayBuffer>;
/**
 * Intensity-stereo position ratios, indexed by `is_pos`.
 *
 * In intensity stereo the encoder discards the side channel above some band and
 * stores only a panning position; the decoder reconstructs both channels from
 * the mid signal and this ratio.
 */
export declare const INTENSITY_RATIOS: Float32Array<ArrayBuffer>;
/** IMDCT cosine basis for the 36-point (long) transform. */
export declare const IMDCT_COS_36: Float32Array<ArrayBuffer>;
/** IMDCT cosine basis for the 12-point (short) transform. */
export declare const IMDCT_COS_12: Float32Array<ArrayBuffer>;
/**
 * The synthesis filterbank window is generated rather than listed here — see
 * `synth-window.ts` for why, and for how it is derived.
 */
export { SYNTH_WINDOW } from './synth-window.js';
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