77 lines
2.0 KiB
TypeScript
77 lines
2.0 KiB
TypeScript
import { NextResponse } from "next/server";
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import { Communicate } from "edge-tts-ts";
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export const runtime = "nodejs";
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export const dynamic = "force-dynamic";
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const DEFAULT_VOICE = process.env.EDGE_TTS_VOICE || "zh-CN-XiaoxiaoNeural";
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const MAX_TEXT_LENGTH = 12000;
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type EdgeTtsRequest = {
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text?: unknown;
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voice?: unknown;
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};
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const jsonError = (message: string, status: number) =>
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NextResponse.json({ error: message }, { status });
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export async function POST(request: Request) {
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let payload: EdgeTtsRequest;
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try {
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payload = (await request.json()) as EdgeTtsRequest;
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} catch {
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return jsonError("Invalid JSON body", 400);
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}
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const text = typeof payload.text === "string" ? payload.text.trim() : "";
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if (!text) {
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return jsonError("text is required", 400);
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}
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if (text.length > MAX_TEXT_LENGTH) {
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return jsonError(`text must be ${MAX_TEXT_LENGTH} characters or fewer`, 413);
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}
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const voice =
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typeof payload.voice === "string" && payload.voice.trim()
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? payload.voice.trim()
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: DEFAULT_VOICE;
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try {
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const communicate = new Communicate(text, { voice });
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const chunks: Uint8Array[] = [];
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let byteLength = 0;
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for await (const chunk of communicate.stream()) {
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if (chunk.type !== "audio") continue;
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chunks.push(chunk.data);
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byteLength += chunk.data.byteLength;
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}
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if (byteLength === 0) {
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return jsonError("Edge TTS returned empty audio", 502);
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}
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const audio = new Uint8Array(byteLength);
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let offset = 0;
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for (const chunk of chunks) {
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audio.set(chunk, offset);
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offset += chunk.byteLength;
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}
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const audioBuffer = audio.buffer.slice(
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audio.byteOffset,
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audio.byteOffset + audio.byteLength,
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);
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return new Response(audioBuffer, {
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headers: {
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"Content-Type": "audio/mpeg",
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"Cache-Control": "no-store",
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},
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});
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} catch (error) {
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console.error("[EdgeTTS] Failed to synthesize speech:", error);
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return jsonError("Failed to synthesize speech", 502);
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}
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}
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