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docs: Realtime Input: audio_stream_end Support #6768

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12 changes: 12 additions & 0 deletions docs/realtime-input-audio-stream-end-support.md
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# Realtime Input: audio_stream_end Support

ADK supports sending the `audio_stream_end` signal in realtime streaming inputs to the Gemini Live API.

## Overview

When Voice Activity Detection (VAD) is active, the Gemini Live API requires an explicit `audio_stream_end` signal to flush cached audio buffers upon completion of user speech.

## Shipped Changes

- **`LiveClientRealtimeInput` Handling**: `GeminiLlmConnection`, `BaseLlmFlow`, and `LiveRequestQueue` accept generic `LiveClientRealtimeInput` messages with `audio_stream_end` configured.
- **Buffer Flushing**: Sending `audio_stream_end=True` notifies the backend to process and flush buffered audio rather than waiting for subsequent chunks.
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