rust_webrtc/client/src/media.rs

use protocol::Error;
use wasm_bindgen_futures::JsFuture;
use web_sys::{
    MediaStream, MediaStreamConstraints, MediaStreamTrack, MediaTrackConstraints,
    wasm_bindgen::{JsCast, JsValue},
    window,
};

pub async fn audio() -> Result<MediaStream, Error> {
    let media_devices = window()
        .ok_or(Error::MediaStream("Accessing Window".to_owned()))?
        .navigator()
        .media_devices()
        .map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;

    let media_stream_constraints = MediaStreamConstraints::new();
    let media_track_constraints = MediaTrackConstraints::new();

    media_stream_constraints.set_audio(&JsValue::TRUE);
    media_track_constraints.set_echo_cancellation(&JsValue::FALSE);
    media_track_constraints.set_noise_suppression(&JsValue::FALSE);
    media_track_constraints.set_auto_gain_control(&JsValue::FALSE);

    let media_stream_promise = media_devices
        .get_user_media_with_constraints(&media_stream_constraints)
        .map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;
    let media_stream = JsFuture::from(media_stream_promise)
        .await
        .map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;
    let media_stream = media_stream.unchecked_ref::<MediaStream>();

    let audio_stream_tracks = media_stream.get_audio_tracks();
    let audio_stream_tracks = audio_stream_tracks
        .iter()
        .map(|audio_track| MediaStreamTrack::from(audio_track))
        .collect::<Vec<_>>();
    let audio_stream_track = audio_stream_tracks
        .first()
        .ok_or(Error::MediaStream("Get First Media Track".to_owned()))?;

    let audio_stream_track_apply_constraints_promise = audio_stream_track
        .apply_constraints_with_constraints(&media_track_constraints)
        .map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;
    JsFuture::from(audio_stream_track_apply_constraints_promise)
        .await
        .map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;

    let audio_stream =
        MediaStream::new().map_err(|err_val| Error::MediaStream(format!("{:?}", err_val)))?;
    audio_stream.add_track(audio_stream_track);

    Ok(audio_stream)
}