DESKTOP-I1T6TF3\Q
19bbee16fe
Add StepFun step-tts-mini / step-tts-2 / stepaudio-2.5-tts as an alternate
TTS provider alongside Xiaomi MiMo. Auto-detected from TTS_BASE_URL host
(contains `stepfun.com` → StepFun; otherwise → MiMo), mirroring how the
image client infers Runware from `*.runware.ai`.
CharacterVoice becomes a discriminated union on `provider`:
- xiaomi: { referenceAudioBase64, mimeType } — unchanged
- stepfun: { voiceId, model, mimeType } — preset voice ID + chosen model
Provision dispatches on the current cfg's base URL; synthesis dispatches
on the voice's own `provider` tag so a session with mixed voices (e.g. a
provider switch mid-development) routes each beat through the correct
protocol. xiaomiSynthesize now guards against being called with a non-
xiaomi voice, surfacing the bug as a clear runtime error instead of a
TypeScript narrow violation at the access site.
StepFun has no voicedesign equivalent — only preset voices + voice
cloning from a reference audio upload. Cloning would require an extra
asset per character, so v1 maps the LLM's Chinese voiceDescription to one
of the 32 published preset IDs via gender + age + tone keyword scoring,
with a deterministic hash spread across the top-3 candidates so multiple
characters with similar descriptions don't collapse onto the identical
preset. lineDelivery is accepted but not yet propagated to StepFun's
voice_label.emotion / .style fields — left as a follow-up.
beat-audio route validation relaxed from `voice.referenceAudioBase64`
(xiaomi-shaped) to `voice.provider` (shape-agnostic), so stepfun voices
pass the gate; provider-specific shape errors still surface from the
synth function.
Observed latency on InfiPlot's dev loop: StepFun step-tts-mini median
~2.3s per beat with 0% timeouts across the test session, vs MiMo's
median ~8s with the long tail tripping the existing 15s synth budget
on roughly 2 of 3 beats. Pricing: step-tts-mini ¥0.9/万字符 (~¥0.14
per typical 50-beat session) vs MiMo TTS currently free under the
Token Plan creator incentive.
AGENTS.md provider matrix updated to describe both providers and the
discriminated-union dispatch.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
41 lines
1.5 KiB
TypeScript
41 lines
1.5 KiB
TypeScript
import { requestBeatAudio } from "@infiplot/engine";
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import type { BeatAudioRequest } from "@infiplot/types";
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import { NextResponse } from "next/server";
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import { loadEngineConfig } from "@/lib/config";
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export const runtime = "nodejs";
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export async function POST(req: Request) {
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let body: BeatAudioRequest;
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try {
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body = (await req.json()) as BeatAudioRequest;
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} catch {
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return NextResponse.json({ error: "Invalid JSON" }, { status: 400 });
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}
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// Accept either provider's voice shape — xiaomi carries referenceAudioBase64,
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// stepfun carries voiceId. We only check the discriminator + the line text;
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// shape-specific validation lives in each provider's synth function.
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if (!body.beat?.id || !body.beat?.line || !body.voice?.provider) {
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return NextResponse.json(
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{ error: "beat.id, beat.line and voice.provider are required" },
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{ status: 400 },
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);
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}
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try {
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const config = loadEngineConfig();
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const result = await requestBeatAudio(config, body);
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if (!result.audio) return new Response(null, { status: 204 });
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const binary = Buffer.from(result.audio.base64, "base64");
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return new Response(binary, {
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headers: { "Content-Type": result.audio.mime },
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});
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} catch (err) {
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// Engine already swallows synth errors and returns audio:null. Anything
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// that reaches here is config-level — surface so the client can log it.
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const message = err instanceof Error ? err.message : "Unknown error";
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return NextResponse.json({ error: message }, { status: 500 });
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}
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}
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