* feat(realtime): EOU-driven semantic_vad turn detection
Add a `semantic_vad` turn-detection mode to the realtime API that feeds
the transcription model live and decides "the user finished speaking"
from the `<EOU>` end-of-utterance token rather than from silence alone.
When EOU fires the turn commits immediately (~0.3s); otherwise it falls
back to an eagerness-scaled silence threshold (low/med/high = 8/4/2s).
Plumbing, bottom to top:
- proto: `AudioTranscriptionLive` bidirectional RPC (config-first oneof,
mono float PCM @16k, ready-ack / Unimplemented degrade signal) plus
`TranscriptResult.eou` for the unary retranscribe gate.
- pkg/grpc: client/server/base/embed scaffolding for the bidi stream,
modeled on AudioTransformStream; release stream conns on terminal Recv.
- parakeet-cpp: live transcription RPC with per-C-call engine locking
(one live stream per turn, finalize+free at commit); bump parakeet.cpp
to ABI v5 — incremental StreamingMel (no more quadratic per-feed mel
recompute that delayed EOU on long turns) and the <EOU>/<EOB> split;
strip the literal <EOU>/<EOB> from offline text and set Eou.
- core/backend: LiveTranscriptionSession wrapper + pipeline
`turn_detection:` config block (type/eagerness/retranscribe).
- realtime: semantic_vad integration — live input captions streamed as
transcription deltas while the user speaks, EOU-immediate commit with
eagerness fallback, optional retranscribe gate (batch re-decode must
also end in <EOU> to confirm), clause synthesis off the LLM token
callback, and per-turn live-transcription / model_load telemetry.
- UI: show the realtime pipeline components as a vertical list.
Docs and tests included; opt-in via the pipeline YAML or per-session
`session.update`. Non-streaming STT backends degrade to silence-only.
Assisted-by: Claude Code:claude-opus-4-8 [Read] [Edit] [Write] [Bash]
Assisted-by: Claude Code:claude-fable-5 [Read] [Edit] [Bash]
Signed-off-by: Richard Palethorpe <io@richiejp.com>
* feat(realtime): explicit formally-verified state machines + parakeet streaming driver
The realtime API had several implicit state machines whose state was inferred
from scattered booleans, channels, and five separate mutexes, leaving
illegal/inconsistent states reachable. Make them explicit and keep the
implementation in step with a formal design; rework the parakeet streaming
backend along the same lines.
Realtime state machines (M1-M5). Each is a sealed sum-type State/Event/Effect
with a total, pure Next(state,event)->(state,[]effect) behind a single-writer
Coordinator:
M1 conncoord connection lifecycle: VAD toggle + once-only teardown
(replaces vadServerStarted + a `done` channel closed from
two sites).
M2 turncoord turn detection: collapses speechStarted and the live-stream
"turn open" flag into one state, so discardTurn can no longer
desync them and suppress the next onset.
M3 respcoord response coordination: serializes the dual-writer
start/cancel so at most one response is live; one
response.done per response.create.
M4 compactcoord conversation compaction: single-flight (replaces the
`compacting atomic.Bool` CAS).
M5 ttscoord TTS pipeline: open->closing->closed, idempotent wait(),
rejects enqueue-after-close (was a silent drop).
The Coordinator/Sink/Next plumbing — only the sealed types and Next differed
per machine — is extracted once into core/http/endpoints/openai/coordinator as
a generic Coordinator[S,E,F]; each machine keeps its public API via type
aliases, so no sink, call-site, or test moved.
Hierarchy. session_lifecycle.fizz models M1 as the parent region with its
children (M2/M3/M4) as one statechart and asserts ChildrenDieWithParent (conn
torn => all children terminal, none start after teardown). respcoord and
compactcoord gain an absorbing Terminated state + Shutdown event; conncoord's
teardown drives the children terminal. This closes a compaction teardown gap: a
fire-and-forget compaction could outlive a torn session — compactionSink now
takes a session-scoped cancellable context + WaitGroup and joins the in-flight
summarize+evict on shutdown.
Formal verification. formal-verification/ holds one authoritative FizzBee spec
per machine plus the composition spec, each with an always-assertion and a
documented one-line edit that makes the checker fail (verified non-vacuous).
scripts/realtime-conformance.sh is fail-closed: all Go conformance suites under
-race AND a model-check of every .fizz spec; a missing FizzBee is a hard error
(only the loud REALTIME_CONFORMANCE_SKIP_FIZZBEE=1 bypasses it, never in CI).
FizzBee is pinned by sha256 and installed via scripts/install-fizzbee.sh into
.tools/ (gitignored). Wired as make test-realtime-conformance, a CI workflow,
and a pre-commit path filter. Go conformance tests are Ginkgo/Gomega (per the
repo's forbidigo lint): transition tables + fixed-seed property walks +
concurrent/-race specs, no rapid dependency. Design map:
docs/design/realtime-state-machines.md.
Parakeet streaming backend. The same treatment applied to the parakeet-cpp
streaming paths:
- AudioTranscriptionStream returns codes.Unimplemented for non-streaming models
instead of decoding offline and emitting it as one delta + final. A client
that asked for streaming learns the model cannot stream rather than receiving
a batch result shaped like a stream. New grpcerrors.StreamTranscriptionUnsupported
carries that signal; the HTTP /v1/audio/transcriptions stream path surfaces it
as an SSE error event. Mirrors AudioTranscriptionLive, which already did this.
- utteranceBoundary (boundary.go): a single definition of the end-of-utterance
latch, replacing three open-coded finalEou toggles. Modelled as a two-valued
type so illegal states are unrepresentable.
- Shared decode driver (driver.go): streamFeedResult (one per-feed event) +
feedChunk (hides the ABI v4 JSON vs text-only split) + feedSlices + flushTail.
The feed loop is written once.
- AudioTranscriptionLive becomes a bidi adapter: it streams the per-feed
{delta,eou,eob,words} the realtime turn detector consumes and a terminal
FinalResult carrying only Text. Segments/duration/eou are offline-only and no
longer produced (nor read) on the live path; liveTraceState drops the terminal
eou and keeps the per-feed eou_events count.
- AudioTranscriptionStream + streamJSON merge into one driver-based function;
streamSegmenter is generalized to the unified event with a text-only fallback
that preserves the legacy (no-words) library's per-utterance segmentation.
Verified: build/vet/gofumpt clean, golangci-lint 0 issues, all coordinator and
parakeet packages under -race, the fail-closed conformance gate green, and
make test-realtime (12 e2e WS+WebRTC).
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
Signed-off-by: Richard Palethorpe <io@richiejp.com>
---------
Signed-off-by: Richard Palethorpe <io@richiejp.com>
* feat(proto): add speaker field to TranscriptSegment for diarization
Add speaker field to the gRPC TranscriptSegment message and map it
through the Go schema, enabling backends to return speaker labels.
Signed-off-by: eureka928 <meobius123@gmail.com>
* feat(whisperx): add whisperx backend for transcription with diarization
Add Python gRPC backend using WhisperX for speech-to-text with
word-level timestamps, forced alignment, and speaker diarization
via pyannote-audio when HF_TOKEN is provided.
Signed-off-by: eureka928 <meobius123@gmail.com>
* feat(whisperx): register whisperx backend in Makefile
Signed-off-by: eureka928 <meobius123@gmail.com>
* feat(whisperx): add whisperx meta and image entries to index.yaml
Signed-off-by: eureka928 <meobius123@gmail.com>
* ci(whisperx): add build matrix entries for CPU, CUDA 12/13, and ROCm
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(whisperx): unpin torch versions and use CPU index for cpu requirements
Address review feedback:
- Use --extra-index-url for CPU torch wheels to reduce size
- Remove torch version pins, let uv resolve compatible versions
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(whisperx): pin torch ROCm variant to fix CI build failure
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(whisperx): pin torch CPU variant to fix uv resolution failure
Pin torch==2.8.0+cpu so uv resolves the CPU wheel from the extra
index instead of picking torch==2.8.0+cu128 from PyPI, which pulls
unresolvable CUDA dependencies.
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(whisperx): use unsafe-best-match index strategy to fix uv resolution failure
uv's default first-match strategy finds torch on PyPI before checking
the extra index, causing it to pick torch==2.8.0+cu128 instead of the
CPU variant. This makes whisperx's transitive torch dependency
unresolvable. Using unsafe-best-match lets uv consider all indexes.
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(whisperx): drop +cpu local version suffix to fix uv resolution failure
PEP 440 ==2.8.0 matches 2.8.0+cpu from the extra index, avoiding the
issue where uv cannot locate an explicit +cpu local version specifier.
This aligns with the pattern used by all other CPU backends.
Signed-off-by: eureka928 <meobius123@gmail.com>
* fix(backends): drop +rocm local version suffixes from hipblas requirements to fix uv resolution
uv cannot resolve PEP 440 local version specifiers (e.g. +rocm6.4,
+rocm6.3) in pinned requirements. The --extra-index-url already points
to the correct ROCm wheel index and --index-strategy unsafe-best-match
(set in libbackend.sh) ensures the ROCm variant is preferred.
Applies the same fix as 7f5d72e8 (which resolved this for +cpu) across
all 14 hipblas requirements files.
Signed-off-by: eureka928 <meobius123@gmail.com>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: eureka928 <meobius123@gmail.com>
* revert: scope hipblas suffix fix to whisperx only
Reverts changes to non-whisperx hipblas requirements files per
maintainer review — other backends are building fine with the +rocm
local version suffix.
Signed-off-by: eureka928 <meobius123@gmail.com>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: eureka928 <meobius123@gmail.com>
---------
Signed-off-by: eureka928 <meobius123@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
* WIP response format implementation for audio transcriptions
(cherry picked from commit e271dd764bbc13846accf3beb8b6522153aa276f)
Signed-off-by: Andres Smith <andressmithdev@pm.me>
* Rework transcript response_format and add more formats
(cherry picked from commit 6a93a8f63e2ee5726bca2980b0c9cf4ef8b7aeb8)
Signed-off-by: Andres Smith <andressmithdev@pm.me>
* Add test and replace go-openai package with official openai go client
(cherry picked from commit f25d1a04e46526429c89db4c739e1e65942ca893)
Signed-off-by: Andres Smith <andressmithdev@pm.me>
* Fix faster-whisper backend and refactor transcription formatting to also work on CLI
Signed-off-by: Andres Smith <andressmithdev@pm.me>
(cherry picked from commit 69a93977d5e113eb7172bd85a0f918592d3d2168)
Signed-off-by: Andres Smith <andressmithdev@pm.me>
---------
Signed-off-by: Andres Smith <andressmithdev@pm.me>
Co-authored-by: nanoandrew4 <nanoandrew4@gmail.com>
Co-authored-by: Ettore Di Giacinto <mudler@users.noreply.github.com>
* start breaking up the giant channel refactor now that it's better understood - easier to merge bites
Signed-off-by: Dave Lee <dave@gray101.com>
* add concurrency and base64 back in, along with new base64 tests.
Signed-off-by: Dave Lee <dave@gray101.com>
* Automatic rename of whisper.go's Result to TranscriptResult
Signed-off-by: Dave Lee <dave@gray101.com>
* remove pkg/concurrency - significant changes coming in split 2
Signed-off-by: Dave Lee <dave@gray101.com>
* fix comments
Signed-off-by: Dave Lee <dave@gray101.com>
* add list_model service as another low-risk service to get it out of the way
Signed-off-by: Dave Lee <dave@gray101.com>
* split backend config loader into seperate file from the actual config struct. No changes yet, just reduce cognative load with smaller files of logical blocks
Signed-off-by: Dave Lee <dave@gray101.com>
* rename state.go ==> application.go
Signed-off-by: Dave Lee <dave@gray101.com>
* fix lost import?
Signed-off-by: Dave Lee <dave@gray101.com>
---------
Signed-off-by: Dave Lee <dave@gray101.com>
