seed_reference hashes the ICL reference codes and restores the conv
contexts, KV ring, and position from a per reference snapshot slot on
a repeat, saving the primed state device to device after a fresh
prime. The reference priming cost amortizes across repeated cloned
voice requests.
Every causal conv carries its left context in a persistent backend
tensor and every transposed conv its overlap tail, so a T=1 frame
decode reproduces the offline full decode exactly with zero re decoded
context. The tokenizer transformer attends over a sliding window KV
ring written through set_rows. The frame graph builds and allocates
once, then every frame is input uploads, one direct backend compute,
and one readback. The quantizer conts each codebook id view so the
Vulkan get_rows path accepts the direct compute. Each generated frame
emits its samples immediately and ICL priming feeds the full reference
through the same state. The buffered path keeps the chunked decode and
both codec framing knobs now apply to it alone.
The upstream pipeline decodes reference plus generated codes then trims,
giving the first generated frames causal context from the reference; the
generated only decode started the vocoder from an empty state and
colored the clone onset. Seed both decode paths with the last
min(ref_T, left_ctx_frames) reference frames: the streaming decoder
takes them below its emit cursor so they are never emitted, the buffered
path prepends them and strips their samples. Raising
codec_left_context_sec past the reference duration reproduces the
upstream full reference decode exactly.
Pascal