audio.cpp TTS engines (2026-09-05, upstream main a8fccb47: IndexTTS-2.5 + Higgs Audio v3 + Fish S2 Pro)
audio.cpp composite build (index_tts2,higgs_audio_tts,fish_audio) for SubtitleEdit's IndexTTS-2.5 engine.
Source: 0xShug0/audio.cpp @ a8fccb478fa1fda648c75f1a50dcff2d13744bd4, Apache-2.0.
Binaries only — IndexTTS-2.5 weights are downloaded from Hugging Face at runtime and carry the separate bilibili Model Use License.
See SHA256SUMS.txt for the hashes to add to DownloadHashManager.