cpp/inflect_tts_sdk/src/tts_server.cpp

/**
 * Inflect-Nano-v2 OpenAI-compatible TTS Server
 *
 * Start:  tts_server [--port 8000] [--host 0.0.0.0]
 *
 * API:
 *   GET  /health
 *   GET  /v1/models
 *   POST /v1/audio/speech   (OpenAI TTS)
 *
 * Dependencies (production):
 *   - cpp-httplib  (https://github.com/yhirose/cpp-httplib)
 *   - nlohmann/json (https://github.com/nlohmann/json)
 *
 * Build: cmake .. -DCPPHTTPLIB_DIR=... -DJSON_DIR=... && make tts_server
 */
#include <iostream>
#include <sstream>
#include <string>
#include <cstring>
#include <stdexcept>
#include "inflect_tts.hpp"

// ---- placeholder: replace with cpp-httplib in production ----

static void print_startup(int host, int port) {
    std::cout << "🎤 Inflect-Nano-v2 TTS Server\n";
    std::cout << "   Listening on 0.0.0.0:" << port << "\n";
    std::cout << "\n";
    std::cout << "   POST /v1/audio/speech  (OpenAI-compatible)\n";
    std::cout << "   GET  /health\n";
    std::cout << "   GET  /v1/models\n";
    std::cout << "\n";
    std::cout << "   Example:\n";
    std::cout << "   curl -X POST http://localhost:" << port << "/v1/audio/speech \\\n";
    std::cout << "     -H 'Content-Type: application/json' \\\n";
    std::cout << "     -d '{\"model\":\"tts-1\",\"input\":\"Hello world\"}' \\\n";
    std::cout << "     --output speech.wav\n";
    std::cout << "\n";
    std::cout << "   ⚠  Production build requires cpp-httplib + nlohmann/json.\n";
    std::cout << "      git clone https://github.com/yhirose/cpp-httplib.git\n";
    std::cout << "      git clone https://github.com/nlohmann/json.git\n";
    std::cout << "      cmake .. -DCPPHTTPLIB_DIR=<path> -DJSON_DIR=<path>\n";
}

// ---- Production HTTP handler (uncomment with cpp-httplib) ----
/*
static std::string handle_speech(TTSEngine& engine, const std::string& body) {
    auto j = nlohmann::json::parse(body);
    std::string text = j.value("input", "");
    float speed = j.value("speed", 1.0f);
    float variation = j.value("variation", 0.667f);

    auto waveform = engine.synthesize(text, speed, variation);

    // Write WAV
    std::ostringstream wav;
    int sample_rate = 24000;
    int data_size = waveform.size() * sizeof(float) * 8 / 16; // convert to int16
    // ... WAV header + int16 samples ...

    return wav.str();
}
*/

int main(int argc, char* argv[]) {
    int port = 8000;

    for (int i = 1; i < argc; ++i) {
        if ((strcmp(argv[i], "--port") == 0 || strcmp(argv[i], "-p") == 0)
            && i + 1 < argc)
            port = std::stoi(argv[++i]);
    }

    print_startup(0, port);

    // TODO: Production HTTP loop with cpp-httplib
    //
    // httplib::Server svr;
    //
    // TTSEngine engine("../models/inflect_encoder.axmodel",
    //                  "../models/inflect_decoder.axmodel");
    //
    // svr.Get("/health", [](const httplib::Request&, httplib::Response& res) {
    //     res.set_content("{\"status\":\"ok\",\"model\":\"inflect-nano-v2\"}",
    //                     "application/json");
    // });
    //
    // svr.Get("/v1/models", [](const httplib::Request&, httplib::Response& res) {
    //     res.set_content("{\"object\":\"list\",\"data\":[{\"id\":\"inflect-nano-v2\""
    //                     ",\"object\":\"model\",\"owned_by\":\"owensong\"}]}",
    //                     "application/json");
    // });
    //
    // svr.Post("/v1/audio/speech", [&](const httplib::Request& req,
    //                                   httplib::Response& res) {
    //     auto wav = handle_speech(engine, req.body);
    //     res.set_content(wav, "audio/wav");
    // });
    //
    // svr.listen("0.0.0.0", port);

    return 0;
}