Add native Bark TTS model family

[DrewThomasson]

Summary

• add native bark_tts support for Suno Bark Small
• implement semantic, coarse, and fine Bark transformers
• implement the 24 kHz EnCodec decoder with parity coverage
• add BERT WordPiece tokenizer and all 261 upstream speaker histories
• add F16 and Q8_0 model package specs, converter, docs, and tests

Validation

• bark_tokenizer_test
• bark_codec_parity: cosine similarity 0.99999976 vs Hugging Face on 32 frames
• semantic transformer top-token parity against Hugging Face
• end-to-end audiocpp_cli synthesis at 24 kHz
• python3 tools/check_loader_catalog_sync.py

The generated demo is attached in the companion model PR and linked below.

[DrewThomasson]

Bark Small audio.cpp demo

Generated by the native audiocpp_cli Q8_0 package at 24 kHz using v2/en_speaker_6 and the text “Hello from Bark.”

Download/play the MP4 demo

[DrewThomasson]

Fixed Bark full-sentence demo (generated after semantic history sequence fix): download MP4

[DrewThomasson]

Correction: the playable raw MP4 URL is https://raw.githubusercontent.com/DrewThomasson/audio.cpp/feature/suno-bark-small/demos/bark-small-fixed-full-sentence.mp4 (the download link above is correct).

[DrewThomasson]

still garbadge
gota fix further

[DrewThomasson]

Verified Bark fix (commit c917430). This MP4 was generated by the native audio.cpp CPU path using the corrected 703 MB quality-safe hybrid Q8 package. Input: “Hello, this is Bark.” Independent local Whisper Small English transcription: “Hello. This is bark.”

Download/play MP4