media-utils/dist/index.mjs

Opinionated collection of user media utils by @dapotatoman

function destroyStream(stream, emitEvent) {
  if (!stream)
    return;
  stream.getTracks().forEach((track) => {
    track.stop();
    stream.removeTrack(track);
    if (emitEvent) {
      track.dispatchEvent(new Event("ended"));
      stream.dispatchEvent(new Event("removeTrack"));
    }
  });
}
function destroyStreams(streams, emitEvent) {
  if (!(streams == null ? void 0 : streams.length))
    throw new Error("No stream was passed");
  streams.forEach((stream) => stream.getTracks().forEach((track) => {
    track.stop();
    stream.removeTrack(track);
    if (emitEvent) {
      track.dispatchEvent(new Event("ended"));
      stream.dispatchEvent(new Event("removetrack"));
    }
  }));
}
function getStream(constraints) {
  return navigator.mediaDevices.getUserMedia(constraints);
}

function amplifyStream(stream, level) {
  const [audioTrack] = stream.getAudioTracks();
  const streamClone = new MediaStream([audioTrack]);
  const ctx = new AudioContext();
  const source = ctx.createMediaStreamSource(streamClone);
  const destination = ctx.createMediaStreamDestination();
  const gainNode = ctx.createGain();
  gainNode.gain.value = level;
  [source, gainNode, destination].reduce((a, b) => a && a.connect(b));
  const [newTrack] = destination.stream.getAudioTracks();
  stream.removeTrack(audioTrack);
  stream.addTrack(newTrack);
  function destroy() {
    destroyStream(stream);
    destroyStream(streamClone);
    destroyStream(destination.stream);
    destination.disconnect();
    source.disconnect();
    if (ctx.state !== "closed")
      ctx.close();
  }
  function setLevel(value) {
    gainNode.gain.value = value;
  }
  return { destroy, setLevel };
}
function muxStreams(videoStream, ...audioStream) {
  audioStream.forEach((stream) => stream.getAudioTracks().forEach((track) => videoStream.addTrack(track)));
  return videoStream;
}

function onTracksEnded(stream, callback) {
  const tracks = stream.getTracks();
  const tracksRunning = tracks.map((i) => i.enabled && i.readyState === "live");
  tracks.forEach((track, index) => track.addEventListener("ended", () => {
    tracksRunning[index] = false;
    if (!tracksRunning.find((i) => i === true))
      callback();
  }));
}
function onAnyTrackEnded(stream, callback, destroy) {
  const tracks = stream.getTracks();
  function unregister(i) {
    tracks.forEach((e) => e.removeEventListener("ended", i));
    if (destroy)
      destroyStream(stream);
  }
  function listener() {
    callback();
    unregister(listener);
  }
  tracks.forEach((i) => i.addEventListener("ended", listener));
  return unregister.bind(unregister, listener);
}

function getDevices(kind) {
  return navigator.mediaDevices.enumerateDevices().then((devices) => {
    if (kind)
      return devices.filter((i) => i.kind === kind);
    return devices;
  });
}
function getCategorizedDevices() {
  return getDevices().then((devices) => {
    const list = {};
    devices.forEach((i) => list[i.kind].push(i));
    return list;
  });
}
function getFilteredDevices(key, value) {
  return getDevices().then((devices) => devices.filter((i) => (i == null ? void 0 : i[key]) === value));
}
async function getDevice(key, value, devices) {
  const entries = devices || await getDevices();
  return entries.filter((i) => (i == null ? void 0 : i[key]) === value);
}

class EventBus {
  constructor() {
    this.bus = new EventTarget();
  }
  on(type, listener) {
    this.bus.addEventListener(type, listener);
  }
  once(type, listener) {
    this.bus.addEventListener(type, listener, { once: true });
  }
  off(type, listener) {
    this.bus.removeEventListener(type, listener);
  }
  emit(type, data) {
    const evt = new CustomEvent(type, { detail: data });
    this.bus.dispatchEvent(evt);
  }
}

function onDeviceChange(listener, options) {
  navigator.mediaDevices.addEventListener("devicechange", listener, options);
  return () => navigator.mediaDevices.removeEventListener("devicechange", listener, options);
}
function watchDevice(key, value) {
  const events = new EventBus();
  let deviceExists = false;
  const updateDevice = () => getDevice(key, value).then(([i]) => deviceExists = !!i);
  (async () => {
    await updateDevice();
    onDeviceChange(async () => {
      const device = await getDevice(key, value);
      if (deviceExists && !device)
        events.emit("removed");
      else if (!deviceExists && device)
        events.emit("added");
      deviceExists = !!device;
    });
  })();
  return events;
}
function watchDevicesList(onUpdate, immediate) {
  const update = () => getDevices().then(onUpdate);
  if (immediate)
    update();
  return onDeviceChange(update, { passive: true });
}

function requestMediaPermissions() {
  return Promise.all([
    navigator.mediaDevices.getUserMedia({ audio: true }),
    navigator.mediaDevices.getUserMedia({ video: true }),
    navigator.mediaDevices.getUserMedia({ audio: true, video: true })
  ]).then((streams) => {
    streams.forEach((i) => destroyStream(i));
    return true;
  }).catch(() => false);
}
function requestPermission(name) {
  const key = { camera: "video", microphone: "audio" }[name];
  return navigator.mediaDevices.getUserMedia({ [key]: true }).then(() => true).catch(() => false);
}
function watchPermission(name, onChange, immediate) {
  const destroy = navigator.permissions.query({ name }).then((status) => {
    if (immediate)
      onChange(status);
    status.addEventListener("change", () => onChange(status));
    return () => status.removeEventListener("change", () => onChange(status));
  });
  return () => {
    destroy.then((fn) => fn == null ? void 0 : fn());
  };
}
function watchPermissions(names, onChange, immediate) {
  const destroyFns = [];
  names.forEach((name) => destroyFns.push(watchPermission(name, (i) => onChange(name, i), immediate)));
  return () => destroyFns.forEach((fn) => fn == null ? void 0 : fn());
}
function hasPermission(name) {
  return navigator.permissions.query({ name }).then((status) => {
    return status.state === "granted";
  });
}
function hasMediaPermissions(name) {
  return Promise.all([
    hasPermission("camera"),
    hasPermission("microphone")
  ]).then((i) => i[0] && i[1]);
}

export { amplifyStream, destroyStream, destroyStreams, getCategorizedDevices, getDevice, getDevices, getFilteredDevices, getStream, hasMediaPermissions, hasPermission, muxStreams, onAnyTrackEnded, onDeviceChange, onTracksEnded, requestMediaPermissions, requestPermission, watchDevice, watchDevicesList, watchPermission, watchPermissions };