/** @packageDocumentation Audio properties for TrueAudio (TTA) streams. Parses the 18-byte TTA1 header. */
import { AudioProperties } from "../audioProperties.js";
import { ByteVector } from "../byteVector.js";
import type { offset_t, ReadStyle } from "../toolkit/types.js";
/**
 * Size of the TTA1 header in bytes:
 * `"TTA"` (3) + version (1) + format (2) + channels (2) +
 * bitsPerSample (2) + sampleRate (4) + sampleFrames (4) = 18 bytes.
 */
export declare const TTA_HEADER_SIZE = 18;
/**
 * Audio properties for TrueAudio (TTA) streams.
 *
 * Parses the 18-byte TTA1 header: `"TTA"` + version byte + audio format (2) +
 * channels (2) + bitsPerSample (2) + sampleRate (4) + sampleFrames (4).
 */
export declare class TrueAudioProperties extends AudioProperties {
    /** TTA stream version number (e.g. `1` for TTA1). */
    private _version;
    /** Playback duration in milliseconds. */
    private _lengthInMs;
    /** Average bitrate in kilobits per second. */
    private _bitrate;
    /** Sample rate in Hz. */
    private _sampleRate;
    /** Number of audio channels. */
    private _channels;
    /** Bits per sample (bit depth). */
    private _bitsPerSample;
    /** Total number of PCM sample frames. */
    private _sampleFrames;
    /**
     * Constructs a {@link TrueAudioProperties} instance by parsing the TTA1 header.
     * @param data - Raw bytes beginning with `"TTA"` (must be at least {@link TTA_HEADER_SIZE} bytes for TTA1).
     * @param streamLength - Byte length of the audio stream (excluding tags), used to compute bitrate.
     * @param readStyle - Level of detail for property parsing.
     */
    constructor(data: ByteVector, streamLength: offset_t, readStyle: ReadStyle);
    /**
     * Playback duration in milliseconds.
     * @returns Duration in milliseconds, or `0` if unknown.
     */
    get lengthInMilliseconds(): number;
    /**
     * Average bitrate of the stream in kilobits per second.
     * @returns Bitrate in kbps, or `0` if unknown.
     */
    get bitrate(): number;
    /**
     * Sample rate of the audio stream in Hz.
     * @returns Sample rate in Hz, or `0` if unknown.
     */
    get sampleRate(): number;
    /**
     * Number of audio channels.
     * @returns Channel count (e.g. `2` for stereo).
     */
    get channels(): number;
    /**
     * TrueAudio stream version number.
     * @returns The version (e.g. `1` for TTA1).
     */
    get ttaVersion(): number;
    /**
     * Bits per sample (bit depth) of the audio stream.
     * @returns Bit depth (e.g. `16`, `24`).
     */
    get bitsPerSample(): number;
    /**
     * Total number of PCM sample frames in the stream.
     * @returns Sample frame count.
     */
    get sampleFrames(): number;
    /**
     * Parses the TTA1 header bytes and populates all audio property fields.
     * @param data - Raw header bytes starting with `"TTA"`.
     * @param streamLength - Byte length of the audio stream (excluding tags).
     */
    private read;
}
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