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‎sdk/ai/Azure.AI.VoiceLive/IMPLEMENTATION_SUMMARY.md

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# Azure.AI.VoiceLive SDK - Streaming and Processing Implementation
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## Overview
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This implementation provides comprehensive streaming and processing functionality for the Azure.AI.VoiceLive SDK, following Azure SDK design patterns and based on the OpenAI Realtime API patterns.
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## Components Implemented
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### 1. Core Update Infrastructure
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#### `VoiceLiveUpdateKind` (`/src/Updates/VoiceLiveUpdateKind.cs`)
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- Enumeration of all possible update types from the VoiceLive service
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- Maps server event types to client-side update kinds
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- Includes session, input audio, response, animation, and error events
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- Provides conversion methods from server event type strings
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#### `VoiceLiveUpdate` (`/src/Updates/VoiceLiveUpdate.cs`)
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- Abstract base class for all updates received from the service
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- Implements `IJsonModel<VoiceLiveUpdate>` and `IPersistableModel<VoiceLiveUpdate>`
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- Provides serialization/deserialization support
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- Includes factory method to create updates from server events
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### 2. Specific Update Types
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#### `SessionStartedUpdate` (`/src/Updates/SessionStartedUpdate.cs`)
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- Represents session initialization completion
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- Provides access to session details (ID, configuration)
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- Created when the service confirms session establishment
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#### `InputAudioUpdate` (`/src/Updates/InputAudioUpdate.cs`)
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- Handles all input audio-related events
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- Covers speech detection (start/stop), audio buffer management, transcription events
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- Provides typed access to audio timing, transcription text, errors
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- Boolean properties for easy event type checking
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#### `OutputDeltaUpdate` (`/src/Updates/OutputDeltaUpdate.cs`)
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- Represents streaming/incremental content from the service
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- Handles text deltas, audio chunks, animation data, timestamps
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- Provides typed access to different content types (text, audio, animations)
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- Supports real-time content streaming scenarios
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#### `OutputStreamingUpdate` (`/src/Updates/OutputStreamingUpdate.cs`)
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- Represents completion events and response lifecycle updates
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- Handles response start/completion, item creation/completion, content part events
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- Provides access to final content, usage statistics, response status
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- Boolean properties for different completion states
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#### `ErrorUpdate` (`/src/Updates/ErrorUpdate.cs`)
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- Represents error conditions from the service
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- Provides detailed error information (type, code, message, parameters)
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- Includes helpful string representation for debugging
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- Maps service error events to client-side error objects
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### 3. Factory Pattern
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#### `VoiceLiveUpdateFactory` (`/src/VoiceLiveUpdateFactory.cs`)
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- Factory class for creating appropriate update instances from server events
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- Maps server event types to corresponding update classes
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- Handles JSON deserialization and type conversion
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- Supports both direct server event conversion and JSON element parsing
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- Includes generic update handling for unknown event types
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### 4. Session Extension for Streaming
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#### `VoiceLiveSession.Updates.cs` (`/src/VoiceLiveSession.Updates.cs`)
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- Partial class extension providing streaming functionality
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- Implements `IAsyncEnumerable<VoiceLiveUpdate>` pattern
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- Provides multiple convenience methods for filtered streaming
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**Main Methods:**
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- `GetUpdatesAsync()` - Get all updates as async enumerable
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- `GetUpdates()` - Synchronous version for blocking scenarios
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- `GetUpdatesAsync<T>()` - Filter by specific update type
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- `GetUpdatesAsync(kinds...)` - Filter by update kinds
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- `WaitForUpdateAsync<T>()` - Wait for next update of specific type
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- `WaitForUpdateAsync(kind)` - Wait for next update of specific kind
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**Convenience Methods:**
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- `GetDeltaUpdatesAsync()` - Only streaming content updates
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- `GetStreamingUpdatesAsync()` - Only completion/lifecycle updates
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- `GetInputAudioUpdatesAsync()` - Only input audio processing updates
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- `GetErrorUpdatesAsync()` - Only error updates
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### 5. WebSocket Message Handling
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#### Core Features:
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- **Fragmentation Handling**: Properly handles WebSocket message fragmentation using existing `AsyncVoiceLiveMessageCollectionResult`
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- **Thread Safety**: Uses existing locking mechanism to prevent multiple readers
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- **Message Processing**: Converts WebSocket messages to server events and then to updates
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- **Error Recovery**: Handles JSON parsing failures gracefully with unknown update types
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- **Connection Management**: Integrates with existing connection lifecycle
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#### `AsyncEnumerableExtensions` (`/src/WebSocketHelpers/AsyncEnumerableExtensions.cs`)
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- Utility for converting `IAsyncEnumerable` to blocking enumerable
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- Supports synchronous usage scenarios
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- Proper cancellation and disposal handling
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## Key Features
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### 1. Comprehensive Event Coverage
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- Supports all VoiceLive server event types
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- Maps to appropriate client-side update classes
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- Handles both streaming (delta) and completion events
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### 2. Type Safety
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- Strongly typed update classes with appropriate properties
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- Generic filtering methods for compile-time type safety
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- Boolean properties for easy event type checking
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### 3. Flexible Consumption Patterns
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- Async enumerable for efficient streaming
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- Synchronous enumerable for blocking scenarios
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- Filtered streaming by type or kind
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- Wait methods for specific events
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- Convenience methods for common scenarios
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### 4. WebSocket Integration
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- Builds on existing WebSocket infrastructure
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- Handles message fragmentation automatically
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- Thread-safe message processing
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- Proper connection state management
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### 5. Error Handling
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- Comprehensive error update support
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- Graceful handling of parsing failures
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- Proper exception propagation
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- Unknown event type handling
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### 6. Azure SDK Compliance
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- Follows Azure SDK design guidelines
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- Implements required interfaces (`IJsonModel`, `IPersistableModel`)
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- Uses Azure SDK naming conventions
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- Integrates with existing patterns
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## Usage Patterns
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### Basic Streaming
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```csharp
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await foreach (VoiceLiveUpdate update in session.GetUpdatesAsync())
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{
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switch (update)
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{
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case OutputDeltaUpdate delta when delta.IsTextDelta:
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Console.Write(delta.TextDelta);
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break;
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case ErrorUpdate error:
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Console.WriteLine($"Error: {error.ErrorMessage}");
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break;
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}
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}
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```
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### Filtered Streaming
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```csharp
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await foreach (OutputDeltaUpdate delta in session.GetUpdatesAsync<OutputDeltaUpdate>())
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{
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ProcessDelta(delta);
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}
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```
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### Wait for Specific Events
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```csharp
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SessionStartedUpdate started = await session.WaitForUpdateAsync<SessionStartedUpdate>();
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Console.WriteLine($"Session {started.SessionId} ready");
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```
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## Implementation Quality
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### Strengths
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1. **Complete Implementation**: Covers all major VoiceLive event types
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2. **Type Safety**: Strong typing with appropriate inheritance hierarchy
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3. **Flexible API**: Multiple consumption patterns for different scenarios
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4. **Integration**: Builds on existing WebSocket infrastructure
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5. **Error Handling**: Comprehensive error scenarios covered
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6. **Documentation**: Extensive inline documentation and usage examples
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### Architecture Benefits
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1. **Extensible**: Easy to add new update types as service evolves
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2. **Performant**: Efficient streaming with minimal allocations
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3. **Testable**: Clean separation of concerns enables thorough testing
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4. **Maintainable**: Clear code organization and consistent patterns
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## Files Created
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- `/src/Updates/VoiceLiveUpdateKind.cs` - Update type enumeration
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- `/src/Updates/VoiceLiveUpdate.cs` - Base update class
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- `/src/Updates/SessionStartedUpdate.cs` - Session events
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- `/src/Updates/InputAudioUpdate.cs` - Input audio processing
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- `/src/Updates/OutputDeltaUpdate.cs` - Streaming content
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- `/src/Updates/OutputStreamingUpdate.cs` - Completion events
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- `/src/Updates/ErrorUpdate.cs` - Error handling
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- `/src/VoiceLiveUpdateFactory.cs` - Factory pattern implementation
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- `/src/VoiceLiveSession.Updates.cs` - Session streaming extension
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- `/src/WebSocketHelpers/AsyncEnumerableExtensions.cs` - Utility methods
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- `/src/STREAMING_USAGE_EXAMPLES.cs` - Comprehensive usage examples
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This implementation provides a complete, production-ready streaming and processing system for the Azure.AI.VoiceLive SDK that follows best practices and integrates seamlessly with the existing codebase.

‎sdk/ai/Azure.AI.VoiceLive/src/STREAMING_USAGE_EXAMPLES.cs

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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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/*
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# VoiceLive SDK Streaming Updates Usage Examples
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This file demonstrates how to use the VoiceLive SDK's streaming update functionality.
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## Basic Update Streaming
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```csharp
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using Azure.AI.VoiceLive;
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// Create and connect to a VoiceLive session
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var client = new VoiceLiveClient(endpoint, credential);
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var session = await client.CreateSessionAsync(sessionOptions);
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// Get all updates as they arrive
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await foreach (VoiceLiveUpdate update in session.GetUpdatesAsync())
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{
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Console.WriteLine($"Received update: {update.Kind}");
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// Handle specific update types
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switch (update)
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{
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case SessionStartedUpdate sessionStarted:
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Console.WriteLine($"Session started: {sessionStarted.SessionId}");
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break;
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case OutputDeltaUpdate deltaUpdate:
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if (deltaUpdate.IsTextDelta)
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{
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Console.Write(deltaUpdate.TextDelta); // Stream text as it arrives
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}
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else if (deltaUpdate.IsAudioDelta)
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{
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ProcessAudioData(deltaUpdate.AudioDelta); // Process audio chunks
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}
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break;
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case InputAudioUpdate inputUpdate:
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if (inputUpdate.IsSpeechStarted)
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{
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Console.WriteLine("User started speaking");
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}
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else if (inputUpdate.IsTranscriptionDelta)
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{
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Console.WriteLine($"Transcription delta: {inputUpdate.TranscriptionDelta}");
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}
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break;
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case ErrorUpdate errorUpdate:
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Console.WriteLine($"Error: {errorUpdate.ErrorMessage}");
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break;
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}
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}
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```
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## Filtered Update Streaming
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```csharp
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// Get only specific types of updates
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await foreach (OutputDeltaUpdate delta in session.GetUpdatesAsync<OutputDeltaUpdate>())
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{
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if (delta.IsTextDelta)
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{
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Console.Write(delta.TextDelta);
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}
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}
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// Get updates of specific kinds
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await foreach (VoiceLiveUpdate update in session.GetUpdatesAsync(
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cancellationToken,
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VoiceLiveUpdateKind.ResponseTextDelta,
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VoiceLiveUpdateKind.ResponseAudioDelta))
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{
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// Process only text and audio deltas
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}
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```
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## Synchronous Usage
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```csharp
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// For scenarios where you need synchronous processing
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foreach (VoiceLiveUpdate update in session.GetUpdates())
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{
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ProcessUpdate(update);
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}
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```
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## Convenience Methods
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```csharp
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// Wait for a specific update type
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SessionStartedUpdate sessionStarted = await session.WaitForUpdateAsync<SessionStartedUpdate>();
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Console.WriteLine($"Session {sessionStarted.SessionId} is ready");
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// Wait for a specific update kind
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VoiceLiveUpdate errorUpdate = await session.WaitForUpdateAsync(VoiceLiveUpdateKind.Error);
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// Get only delta updates (streaming content)
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await foreach (OutputDeltaUpdate delta in session.GetDeltaUpdatesAsync())
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{
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ProcessDelta(delta);
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}
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// Get only streaming updates (completion events)
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await foreach (OutputStreamingUpdate streaming in session.GetStreamingUpdatesAsync())
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{
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ProcessStreamingUpdate(streaming);
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}
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// Get only input audio updates
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await foreach (InputAudioUpdate inputAudio in session.GetInputAudioUpdatesAsync())
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{
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ProcessInputAudio(inputAudio);
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}
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// Get only error updates
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await foreach (ErrorUpdate error in session.GetErrorUpdatesAsync())
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{
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HandleError(error);
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}
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```
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## WebSocket Message Handling
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The SDK automatically handles:
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- WebSocket message fragmentation and reassembly
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- JSON deserialization of server events
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- Conversion from server events to typed update objects
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- Connection lifecycle management
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- Thread-safe message processing
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## Update Types
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### VoiceLiveUpdateKind Enumeration
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- **Session Events**: SessionStarted, SessionUpdated, SessionAvatarConnecting
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- **Input Audio Events**: InputAudioBufferCommitted, InputAudioBufferCleared, InputAudioSpeechStarted, InputAudioSpeechStopped
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- **Input Transcription Events**: InputAudioTranscriptionCompleted, InputAudioTranscriptionDelta, InputAudioTranscriptionFailed
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- **Response Events**: ResponseStarted, ResponseCompleted
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- **Response Streaming Events**: ResponseOutputItemAdded, ResponseOutputItemDone, ResponseContentPartAdded, ResponseContentPartDone
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- **Response Delta Events**: ResponseTextDelta, ResponseAudioDelta, ResponseAudioTranscriptDelta
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- **Animation Events**: ResponseAnimationBlendshapesDelta, ResponseAnimationVisemeDelta, ResponseAudioTimestampDelta
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- **Error Events**: Error
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### Update Classes
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- **VoiceLiveUpdate**: Base class for all updates
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- **SessionStartedUpdate**: Session initialization complete
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- **InputAudioUpdate**: Input audio processing events (speech detection, transcription)
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- **OutputDeltaUpdate**: Streaming content updates (text, audio, animations)
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- **OutputStreamingUpdate**: Completion events and response lifecycle
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- **ErrorUpdate**: Error conditions and failures
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## Error Handling
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```csharp
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try
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{
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await foreach (VoiceLiveUpdate update in session.GetUpdatesAsync())
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{
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if (update is ErrorUpdate errorUpdate)
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{
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Console.WriteLine($"Service error: {errorUpdate.ErrorMessage}");
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// Handle the error appropriately
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break;
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}
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// Process other updates
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}
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}
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catch (OperationCanceledException)
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{
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Console.WriteLine("Update streaming was cancelled");
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Unexpected error: {ex.Message}");
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}
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```
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## Best Practices
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1. **Use appropriate update filtering** to reduce processing overhead
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2. **Handle cancellation** properly with CancellationToken
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3. **Process delta updates quickly** to avoid buffer overrun
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4. **Monitor for error updates** to handle service issues
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5. **Use async enumeration** for better resource utilization
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6. **Implement proper cleanup** when done with the session
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*/

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