feat: add smallest ai asr and tts extensions#2200
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Add two new vendor extensions for Smallest AI: - smallest_asr_python: real-time speech-to-text via the Pulse live WebSocket API (binary PCM16 in, interim/final transcripts out, finalize control message, reconnect with exponential backoff). - smallest_tts_python: text-to-speech via the Lightning SSE streaming endpoint (base64 PCM16 chunks decoded on the fly, ~100 ms to first audio, output_format pinned to pcm). Both include mocked extension-local test suites, test configs, and README docs. Configured via params.api_key or SMALLEST_API_KEY.
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What
Adds two new vendor extensions for Smallest AI:
smallest_asr_python— real-time speech-to-text using thePulse
live WebSocket API (
wss://api.smallest.ai/waves/v1/stt/live). 38 languages,64 ms time-to-first-transcript.
smallest_tts_python— text-to-speech using theLightning
SSE streaming endpoint (
/waves/v1/tts/live). ~100 ms to first audio chunk,12 languages, voice cloning;
lightning_v3.1andlightning_v3.1_promodels.Implementation notes
ASR (extends
AsyncASRBaseExtension):final=false, finals onPulse's
is_final.asr_finalizemaps to Pulse's{"type": "finalize"}control message (sessionstays open).
word_timestamps=trueby default so final results carry accuratestart_ms/duration_ms.TTS (extends
AsyncTTS2HttpExtension):data: {"audio": "<base64>"}/{"done": true}) decodedincrementally; a partial line is never split across chunk boundaries.
output_formatpinned topcm: Lightning's raw PCM is already signed 16-bitLE mono, matching the
pcm_framecontract with no conversion, and skipping thecontainer header keeps time-to-first-audio low.
invalid_api_keyclassified asINVALID_KEY_ERROR(fatal);everything else non-fatal.
Both authenticate via
params.api_key/SMALLEST_API_KEYand sendX-Source: ten-frameworkfor API-side attribution. All otherparamskeys passthrough verbatim (query string for ASR, request body for TTS).
Testing
ASR — result shape, finalize, dump, metrics, reconnect, vendor error, invalid
params; TTS — basic/dump/flush, error classification, metrics, params/URL
resolution, robustness, state machine.
python -m black --check --line-length 80clean; syntax verified.task asr-guarder-test EXTENSION=smallest_asr_python(pending — will runbefore marking ready for review)
task tts-guarder-test EXTENSION=smallest_tts_python(pending)