export interface LoudnessTarget {
    /** Integrated loudness target (LUFS). Negative number, e.g. -14. */
    integratedLufs: number;
    /** True peak ceiling (dBTP). Default -1. */
    truePeakDb?: number;
    /** Loudness range target (LU). Default 11. */
    loudnessRange?: number;
}
export declare const PLATFORM_TARGETS: Record<string, LoudnessTarget>;
export interface LoudnessMeasurement {
    inputI: number;
    inputTp: number;
    inputLra: number;
    inputThresh: number;
    /** Offset ffmpeg recommends in pass 2 (dB). */
    targetOffset: number;
}
export interface LoudnormJson {
    input_i: string;
    input_tp: string;
    input_lra: string;
    input_thresh: string;
    output_i?: string;
    output_tp?: string;
    output_lra?: string;
    output_thresh?: string;
    normalization_type?: string;
    target_offset: string;
}
/**
 * Pass 1 — measure source loudness. Runs the filter in print_format=json mode
 * and discards the audio. Parses the JSON block ffmpeg writes to stderr.
 *
 * Pass `dualMono: true` for MONO sources (most podcasts). Without it loudnorm
 * under-measures mono content by ~3 LU and pass 2 over-corrects. The
 * `normalize_loudness` tool auto-detects this from probe output.
 */
export declare function measureLoudness(inputPath: string, opts?: {
    signal?: AbortSignal;
    dualMono?: boolean;
}): Promise<LoudnessMeasurement>;
/**
 * Pass 2 — apply loudnorm with measured_* params + the chosen target. Writes a
 * new media file. Audio codec defaults to AAC for video, or PCM for .wav out.
 */
export declare function applyLoudnorm(inputPath: string, outputPath: string, measurement: LoudnessMeasurement, target: LoudnessTarget, opts?: {
    signal?: AbortSignal;
    dualMono?: boolean;
}): Promise<void>;
/** Extract the LAST {...} JSON block from a string. ffmpeg prints prefix lines. */
export declare function extractJsonBlock(s: string): string | undefined;
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