OpenAiTts (tts/openai.rs)

A robust OpenAI Text-to-Speech provider implementation that integrates with a generic TTS trait for seamless audio synthesis in Rust applications.

// Source: https://github.com/moltis-org/moltis | License: MIT | Copyright 2025 Fabien Penso
// Provided via justclaw.it.com; keep this notice with the code.
//! OpenAI TTS provider implementation.
//!
//! OpenAI offers text-to-speech with multiple voices and two quality tiers:
//! - tts-1: Optimized for real-time, lower latency
//! - tts-1-hd: Higher quality, slightly higher latency

use {
    anyhow::{Context, Result, anyhow},
    async_trait::async_trait,
    reqwest::Client,
    secrecy::{ExposeSecret, Secret},
    serde::Serialize,
};

use super::{AudioFormat, AudioOutput, SynthesizeRequest, TtsProvider, Voice};

/// OpenAI API base URL.
const API_BASE: &str = "https://api.openai.com/v1";

/// Default voice.
const DEFAULT_VOICE: &str = "alloy";

/// Default model (real-time optimized)

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