/**
 * Fallback resolver for MPEG-DASH manifests the MSE engines (Shaka / hls.js /
 * dash.js) refuse or can't play — so movi's own FFmpeg-WASM demuxer takes over.
 *
 * It targets the "single file per Representation" shape: each Representation is
 * one complete (fragmented) MP4 addressed by a <BaseURL>, either with NO segment
 * addressing at all, or with a <SegmentBase> that merely indexes the sidx INSIDE
 * that one file. Both are ordinary MP4s the FFmpeg demuxer reads whole via range
 * requests. (SegmentTemplate / SegmentList split media across many separate
 * files and are NOT handled here — that needs a segment-streaming source.)
 *
 * Two failure modes this recovers:
 *  - Shaka is strict and skips single-file-with-SegmentBase Representations
 *    ("does not contain a segment information source"), failing the load with
 *    DASH_EMPTY_PERIOD (4004).
 *  - The browser's MSE can't decode the stream's codec (e.g. Safari + HE-AAC),
 *    so Shaka loads the manifest but appendBuffer fails (error 3014). The WASM
 *    demuxer decodes every codec, so routing the same file through it plays.
 *
 * This module probes the manifest and, when it finds the single-file case,
 * resolves the best video file URL plus (for demuxed content) the separate
 * audio file URL, so the caller can play them through the demuxer (+ a native
 * <audio> element / audioSource for the split audio).
 *
 * Returns null when every Representation is multi-segment (SegmentTemplate /
 * SegmentList), so Shaka's failure was for a reason this fallback can't help.
 */
export interface DashFallbackPlan {
    /** Single-file video (or muxed) Representation to feed the demuxer. */
    videoUrl: string;
    /** Separate audio file for demuxed content; omitted when muxed/audio-only. */
    audioUrl?: string;
    /**
     * Sidecar caption files (single-file WebVTT/SRT text Representations) so the
     * demuxer path can surface them as external subtitle tracks — otherwise the
     * manifest's captions would be lost when we leave the MSE engine.
     */
    subtitles?: {
        url: string;
        lang: string;
        label: string;
        format?: "vtt" | "srt" | "ttml";
    }[];
    /**
     * One audio Representation per LANGUAGE (best bitrate, best-first), so the
     * demuxer path offers the same language menu the stream engine had. Bitrate
     * variants of one language are collapsed (that's ABR, not a track). `lang` is
     * the BCP-47 key; `label` is the display name. Present only when 2+ distinct
     * languages exist; a single language uses `audioUrl`.
     */
    audioTracks?: {
        url: string;
        lang: string;
        label: string;
    }[];
    /**
     * Every selectable video Representation (best-first) with a display label
     * (e.g. "1080p"), so the demuxer path can offer a quality menu. Switching a
     * quality re-loads the main source with that Representation's file. Present
     * only when there's more than one.
     */
    videoTracks?: {
        url: string;
        label: string;
        id: string;
        bandwidth?: number;
    }[];
}
/**
 * Probe a DASH manifest for the bare-BaseURL single-file case. Returns the video
 * (and any separate audio) file URLs, or null if it's not that case.
 */
export declare function analyzeDashFallback(manifestUrl: string, headers?: Record<string, string>, signal?: AbortSignal): Promise<DashFallbackPlan | null>;
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