Speech Releases

v1

1.0 - May 2, 2026

Feature

ISpeechToTextService interface — platform-native speech recognition with permission management, continuous streaming, and listen-until-silence modes

Feature

ITextToSpeechService interface — platform-native text-to-speech with voice selection, speech rate, pitch, and volume control

Feature

IAudioSource interface — raw PCM audio capture from the device microphone (16kHz, 16-bit, mono)

Feature

IAudioPlayer interface — MP3 audio stream playback with play/stop control

Feature

SpeechRecognitionOptions — configurable culture, silence timeout, and on-device preference for STT

Feature

TextToSpeechOptions — configurable culture, voice, speech rate, pitch, and volume for TTS

Feature

ContinuousRecognize() — streaming recognition results via IAsyncEnumerable<SpeechRecognitionResult> with partial and final results

Feature

ListenUntilSilence() — simple dictation mode that returns the final transcription after silence is detected

Feature

GetVoicesAsync() — enumerate available TTS voices with optional culture filtering

Feature

AddSpeechServices() — single extension method to register all core services (STT, TTS, AudioSource, AudioPlayer)

Feature Android

Android STT implementation using SpeechRecognizer with streaming partial results

Feature Android

Android TTS implementation using Android.Speech.Tts.TextToSpeech

Feature Android

Android audio capture via AudioRecord with 16kHz PCM streaming

Feature Android

Android audio playback via MediaPlayer

Feature iOS

iOS STT implementation using SFSpeechRecognizer with SFSpeechAudioBufferRecognitionRequest

Feature iOS

iOS TTS implementation using AVSpeechSynthesizer

Feature iOS

iOS audio capture via AVAudioEngine with PCM tap

Feature iOS

iOS audio playback via AVAudioPlayer

Feature

Cloud provider abstraction — ISpeechToTextProvider and ITextToSpeechProvider interfaces for pluggable cloud backends

Feature

CloudSpeechToText and CloudTextToSpeech — bridge classes that combine platform audio with cloud provider APIs

Feature

AddCloudSpeechToText<T>() and AddCloudTextToSpeech<T>() — generic DI registration for custom cloud providers

Feature

Azure AI Speech provider — AddAzureSpeech() registers Azure STT and/or TTS with subscription key and region

Feature

Azure TTS with SSML prosody control — speech rate, pitch, and volume mapped to SSML elements

Feature

ElevenLabs TTS provider — AddElevenLabsTextToSpeech() registers ElevenLabs cloud TTS with configurable voice and model

Feature

PipeStream utility — thread-safe producer-consumer stream using System.IO.Pipelines for bridging audio capture with cloud providers

Feature WASM

Browser/WebAssembly support — STT and TTS via Web Speech API, auto-detected at runtime via OperatingSystem.IsBrowser()

Feature WASM

Browser STT implementation using SpeechRecognition API with streaming partial and final results

Feature WASM

Browser TTS implementation using SpeechSynthesis API with voice selection, rate, pitch, and volume control

Feature WASM

Browser audio playback via HTML5 Audio element with base64 data URL conversion

Feature

Blazor WebAssembly sample app demonstrating STT, TTS, and voice listing