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cognitive-services-speech-sdk-rs

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# cognitive-services-speech-sdk-rs

---
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[crates-badge]: https://img.shields.io/crates/v/cognitive-services-speech-sdk-rs.svg
[crates-url]: https://crates.io/crates/cognitive-services-speech-sdk-rs
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[rustdoc-url]: https://docs.rs/cognitive-services-speech-sdk-rs

Rust bindings for Microsoft Cognitive Speech Services SDK. Provides thin abstraction around native C API. Heavily inspired by official [Go library](https://github.com/microsoft/cognitive-services-speech-sdk-go). Provides speech-to-text, text-to-speech and bot framework dialog management capabilities.

Pull requests welcome!

### Speech to text 
```rust
use cognitive_services_speech_sdk_rs as msspeech;
use log::*;
use std::env;

async fn speech_to_text() {
    let filename = env::var("WAVFILENAME").unwrap();
    let audio_config = msspeech::audio::AudioConfig::from_wav_file_input(&filename).unwrap();

let speech_config = msspeech::speech::SpeechConfig::from_subscription(
        env::var("MSSubscriptionKey").unwrap(),
        env::var("MSServiceRegion").unwrap(),
    )
    .unwrap();
    let mut speech_recognizer =
        msspeech::speech::SpeechRecognizer::from_config(speech_config, audio_config).unwrap();

speech_recognizer
        .set_session_started_cb(|event| info!("set_session_started_cb {:?}", event))
        .unwrap();

speech_recognizer
        .set_session_stopped_cb(|event| info!("set_session_stopped_cb {:?}", event))
        .unwrap();

speech_recognizer
        .set_speech_start_detected_cb(|event| info!("set_speech_start_detected_cb {:?}", event))
        .unwrap();

speech_recognizer
        .set_speech_end_detected_cb(|event| info!("set_speech_end_detected_cb {:?}", event))
        .unwrap();

speech_recognizer
        .set_recognizing_cb(|event| info!("set_recognizing_cb {:?}", event.result.text))
        .unwrap();

speech_recognizer
        .set_recognized_cb(|event| info!("set_recognized_cb {:?}", event))
        .unwrap();

speech_recognizer
        .set_canceled_cb(|event| info!("set_canceled_cb {:?}", event))
        .unwrap();

let result = speech_recognizer.recognize_once_async().await.unwrap();
    info!("got recognition {:?}", result);
}
```

### Text to speech
```rust
use cognitive_services_speech_sdk_rs as msspeech;
use log::*;
use std::env;

async fn text_to_speech() {
    let pull_stream = msspeech::audio::PullAudioOutputStream::create_pull_stream().unwrap();
    let audio_config = msspeech::audio::AudioConfig::from_stream_output(&pull_stream).unwrap();

let speech_config = msspeech::speech::SpeechConfig::from_subscription(
        env::var("MSSubscriptionKey").unwrap(),
        env::var("MSServiceRegion").unwrap(),
    )
    .unwrap();
    let mut speech_synthesizer =
        msspeech::speech::SpeechSynthesizer::from_config(speech_config, audio_config).unwrap();

speech_synthesizer
        .set_synthesizer_started_cb(|event| info!("synthesizer_started_cb {:?}", event))
        .unwrap();

speech_synthesizer
        .set_synthesizer_synthesizing_cb(|event| info!("synthesizer_synthesizing_cb {:?}", event))
        .unwrap();

speech_synthesizer
        .set_synthesizer_completed_cb(|event| info!("synthesizer_completed_cb {:?}", event))
        .unwrap();

speech_synthesizer
        .set_synthesizer_canceled_cb(|event| info!("synthesizer_canceled_cb {:?}", event))
        .unwrap();

match speech_synthesizer.speak_text_async("Hello Rust!").await {
        Err(err) => error!("speak_text_async error {:?}", err),
        Ok(speech_audio_bytes) => {
            info!("speech_audio_bytes {:?}", speech_audio_bytes);
        }
    }
}
```

For more see github integration tests (*tests* folder) and samples (*examples* folder).

## Build prerequisites

Currently build on Windows, Linux and MacOS is supported. Uses Clang and Microsoft Speech SDK shared libraries. Details can be found here [here](https://docs.microsoft.com/en-us/azure/cognitive-services/speech-service/quickstarts/setup-platform?tabs=dotnet%2Cwindows%2Cjre%2Cbrowser&pivots=programming-language-go).

Install following prerequisites before running *cargo build*:

```
sudo apt-get update 
sudo apt-get install clang build-essential libssl1.0.0 libasound2 wget
```

Build is generating Rust bindings for Speech SDK native functions. These are already prebuilt and put into *ffi/bindings.rs* file. In most cases it is not necessary to regenerate them. Set following to skip bindings regeneration:

```
export MS_COG_SVC_SPEECH_SKIP_BINDGEN=1
cargo build
```

Build process will download MS Speech SDK into target folder. From here you can copy it into other folder, e.g. ./SpeechSDK. When running compiled binary dynamic linking should be used:

Linux:
```
export LD_LIBRARY_PATH=/Users/xxx/cognitive-services-speech-sdk-rs/SpeechSDK/lib/x64 # or  arm32, arm64
```

MacOS:
```
export DYLD_FALLBACK_FRAMEWORK_PATH=/Users/xxx/cognitive-services-speech-sdk-rs/SpeechSDK/macOS/sdk_output/MicrosoftCognitiveServicesSpeech.xcframework/macos-arm64_x86_64
```

Windows (pointing to SpeechSDK directly in target folder):
```
set PATH=%PATH%;"C:\Users\xxx\cognitive-services-speech-sdk-rs\target\debug\build\cognitive-services-speech-sdk-rs-b9c946c378fbb4f1\out\sdk_output\runtimes\win-x64\native"
```

### How To Build On MacOS

We are supporting MacOS **arm** and **aarch64** and **x86_64** architectures.

Run following commands to build:
```
cargo build
```

Speech SDK libraries are linked dynamically during build and run. When running the application use following environment variable to point to custom library location:

```
export DYLD_FALLBACK_FRAMEWORK_PATH=/Users/xxx/cognitive-services-speech-sdk-rs/SpeechSDK/macOS/sdk_output/MicrosoftCognitiveServicesSpeech.xcframework/macos-arm64_x86_64
```

Then run your application utilizing **cognitive-services-speech-sdk-rs** or examples e.g.:
```
cargo run --example recognizer
```

## Added in this version

See [changelog](./changelog.md)

cognitive-services-speech-sdk-rs

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