Update audio format sniffing to require a full 10-byte ID3 header for mp3 detection and add stricter validation of MPEG frame headers to avoid false positives. Refactor ffmpeg process spawning to register abort listeners before module import, ensuring abort signals are handled promptly and preventing orphaned processes. Expand tests to cover edge cases in mp3 header detection.
Introduce `normalizeToMp3` utility to convert wav/ogg audio buffers from TTS providers
to mp3, ensuring consistent mp3-only handling in cache and pipelines. Add logic to
detect and adapt to OpenAI-compatible servers that do not support explicit
`response_format`, falling back to default output and normalizing as needed.
Refactor voice resolution to probe multiple common endpoints and robustly extract
voice/style names from various payload shapes, improving compatibility with custom
OpenAI-compatible servers.
- Add `audio-format.ts` for audio normalization utilities
- Add tests for audio format normalization
- Update TTS provider request logic to apply normalization and handle response format negotiation
- Enhance voice endpoint probing and extraction logic for custom servers
