/** @packageDocumentation FLAC audio properties parsed from the STREAMINFO metadata block. */
import { AudioProperties } from "../audioProperties.js";
import { ByteVector } from "../byteVector.js";
import { ReadStyle } from "../toolkit/types.js";
/**
 * FLAC audio properties, parsed from the STREAMINFO metadata block.
 *
 * STREAMINFO layout (34 bytes minimum):
 *   minBlockSize(2) + maxBlockSize(2) + minFrameSize(3) + maxFrameSize(3) +
 *   sampleRate:20 | channels-1:3 | bitsPerSample-1:5 | totalSamplesHigh:4 (4 bytes) +
 *   totalSamplesLow(4) + md5Signature(16)
 */
export declare class FlacProperties extends AudioProperties {
    /** Track duration in milliseconds. */
    private _lengthInMs;
    /** Approximate bitrate in kbit/s, derived from stream length and sample count. */
    private _bitrate;
    /** Sample rate in Hz. */
    private _sampleRate;
    /** Number of bits per sample. */
    private _bitsPerSample;
    /** Number of audio channels. */
    private _channels;
    /** Total number of inter-channel sample frames in the stream. */
    private _sampleFrames;
    /** MD5 signature of the uncompressed audio data (16 bytes). */
    private _signature;
    /**
     * Constructs FLAC audio properties from a STREAMINFO block.
     * @param streamInfoData Raw bytes of the STREAMINFO block payload (at least 18 bytes).
     * @param streamLength Total byte length of the audio stream (used to estimate bitrate).
     * @param readStyle Read style hint (passed to the base class).
     */
    constructor(streamInfoData: ByteVector, streamLength: number, readStyle?: ReadStyle);
    /** Track duration in milliseconds. */
    get lengthInMilliseconds(): number;
    /** Approximate bitrate in kbit/s. */
    get bitrate(): number;
    /** Sample rate in Hz. */
    get sampleRate(): number;
    /** Number of audio channels. */
    get channels(): number;
    /** Number of bits per sample. */
    get bitsPerSample(): number;
    /** Total number of inter-channel sample frames in the stream. */
    get sampleFrames(): bigint;
    /** MD5 signature of the uncompressed audio stream. */
    get signature(): ByteVector;
    /**
     * Parses the STREAMINFO block payload and populates all property fields.
     * @param data Raw bytes of the STREAMINFO block (at least 18 bytes, big-endian).
     * @param streamLength Total byte length of the audio stream, used to derive bitrate.
     */
    private read;
}
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