/**
 * Music generation via Google Vertex AI Lyria (predict endpoint).
 *
 * VERIFIED LIVE against `lyria-002` (Lyria 2, GA) on 2026-06-01 — the request
 * body and response field below match the real API. INERT / unavailable
 * without a Vertex project (GOOGLE_CLOUD_PROJECT or VERTEX_PROJECT must be set).
 *
 *   POST https://{REGION}-aiplatform.googleapis.com/v1/projects/{PROJECT}/
 *        locations/{REGION}/publishers/google/models/{MODEL}:predict
 *   Authorization: Bearer <token>
 *   Body: { instances: [{ prompt: string }], parameters: { sampleCount: 1 } }
 *   Response: { predictions: [{ bytesBase64Encoded: string (WAV), mimeType }] }
 *
 * MODEL (via LYRIA_MODEL env, default lyria-002):
 *   - lyria-002             Lyria 2, GA, 30s, text-only             ($0.06/30s)
 *   - lyria-3-clip-preview  Lyria 3, 30s, text+image  (PREVIEW — needs project allowlist)
 *   - lyria-3-pro-preview   Lyria 3 Pro, ~184s full song, text+image (PREVIEW — allowlist)
 * NOTE: the Lyria 3 image-input (multimodal) request shape is NOT yet wired or
 * verified here — it needs preview allowlist access; add + verify once granted.
 *
 * Auth (tried in order): GOOGLE_ACCESS_TOKEN env -> GCE metadata server ->
 * `gcloud auth print-access-token` (local dev, dependency-free). For prod/CI,
 * set GOOGLE_ACCESS_TOKEN or run on a GCE/Cloud Run service account.
 * requiresVertex: true.
 */
import type { MusicBackend } from './types.js';
/**
 * True duration (ms) of a RIFF/WAVE buffer, read from its fmt byteRate + data
 * chunk size. Lyria returns a full WAV, so this reports the real clip length
 * (~32.8s for lyria-002) rather than the requested-duration default. Returns
 * null for a non-WAV / unparseable buffer (caller falls back to the request).
 */
export declare function wavDurationMs(buf: Buffer): number | null;
export declare const lyriaBackend: MusicBackend;
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