/**
 * IMA/DVI ADPCM decoding.
 *
 * A 4:1 lossy compression that stores each sample as a 4-bit delta against an
 * adaptive step size. Long obsolete for music, but still the default in a lot of
 * telephony, game-asset, and embedded-recorder output — exactly the awkward
 * files that make a "convert my audio" tool useful. Decode is supported;
 * encoding to ADPCM is not, because nothing benefits from new ADPCM in 2026.
 *
 * Data is organised in fixed-size blocks. Each block restarts the predictor from
 * a stored value, so a corrupt block cannot poison the rest of the stream — and
 * it means blocks can be decoded independently.
 */
/** Frames stored in one ADPCM block. */
export declare function adpcmSamplesPerBlock(blockAlign: number, channels: number): number;
/**
 * Decodes IMA ADPCM into planar float channels.
 *
 * @param bytes Complete ADPCM data (all blocks, concatenated).
 * @param channels Channel count.
 * @param blockAlign Bytes per block, from the container's `fmt ` chunk.
 * @param totalFrames Frames to produce; the tail of a final partial block is dropped.
 */
export declare function decodeImaAdpcm(bytes: Uint8Array, channels: number, blockAlign: number, totalFrames: number): Float32Array[];