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feat: support audio_stream_end for realtime input - #6699
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Merge #4490 **Problem:** `send_realtime` method only accepted `Blob` (audio/video bytes), `ActivityStart`, and `ActivityEnd`. There's no mechanism to send the `audioStreamEnd` boolean field, which is required to flush cached audio when Voice Activity Detection ([VAD](https://ai.google.dev/gemini-api/docs/live-guide#interruptions)) is enabled. **Solution:** This PR updates the `GeminiLlmConnection`, `BaseLlmFlow`, and `LiveRequestQueue` to support sending generic `LiveClientRealtimeInput` messages with `audio_stream_end` field configured to the [Gemini Live API](https://googleapis.github.io/python-genai/genai.html#genai.live.AsyncSession.send_realtime_input). This closes#2887. **Unit Tests:** - added unit test `test_send_realtime_audiostreamend` - all unit tests passing locally - processing priority: activity_start > activity_end > audio_stream_end > blob > content - this is to follows the principal of control signals > data payloads, since `audio_stream_end` is a signal to flush the audio buffer Co-authored-by: Liang Wu <wuliang@google.com> COPYBARA_INTEGRATE_REVIEW=#4490 from lottielin:support-audio-stream-end ea6d2df PiperOrigin-RevId: 956638801
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Summary
Backports commit 0f738a5 (PR #4490,
feat: support audio_stream_end for realtime input, PiperOrigin-RevId: 956638801) frommaintov1.Problem:
send_realtimemethod only acceptedBlob(audio/video bytes),ActivityStart, andActivityEnd. There's no mechanism to send theaudioStreamEndboolean field, which is required to flush cached audio when Voice Activity Detection (VAD) is enabled.Solution:
This PR updates
GeminiLlmConnection,BaseLlmFlow, andLiveRequestQueueto support sending genericLiveClientRealtimeInputmessages withaudio_stream_endfield configured to the Gemini Live API. This closes#2887.Testing Plan
Unit Tests:
test_send_realtime_audio_stream_endtest_send_realtime_unsupported_liveClientRealtimeInputpytest tests/unittests/models/test_gemini_llm_connection.py(46 passed)pytest tests/unittests/agents/test_live_request_queue.py tests/unittests/flows/(431 passed)pre-commit(isort, pyink, addlicense) clean.