设备管理

import { DeviceManager, DeviceInfo, DeviceKind } from 'srtc';

const dm: DeviceManager = DeviceManager.shared;

const cameras: DeviceInfo[] = await dm.cameras();
const mics: DeviceInfo[] = await dm.microphones();
const speakers: DeviceInfo[] = dm.speakers();          // 注意：同步方法
const all: DeviceInfo[] = await dm.getDevices();       // 也可按 kind 过滤

// 前后置切换
camera.switchCamera();

// 切到指定设备
const cameras = await DeviceManager.shared.cameras();
camera.changeDeviceId(cameras[1].deviceId);

import { defaultCameraCaptureOptions, CameraCaptureOptions } from 'srtc';

const opts: CameraCaptureOptions = defaultCameraCaptureOptions();
opts.deviceId = cameras[0].deviceId;
await camera.startCapture(opts);

// 1) 轨道级：切这一条轨道的输入设备
await channel.unpublishLocalAudioTrack(mic);
await mic.changeDeviceId(newDeviceId);
await channel.publishLocalAudioTrack(mic);

// 2) 全局偏好：影响之后创建的音频轨道
await DeviceManager.shared.setAudioInputDevice(newDeviceId);
const current = DeviceManager.shared.preferredAudioInputDeviceId;
DeviceManager.shared.clearAudioInputDevice();     // 回到系统默认

DeviceManager.shared.setSpeakerOutputPreferred(true);          // true=扬声器，false=听筒
const onSpeaker = DeviceManager.shared.isSpeakerOutputPreferred;

import { DeviceManagerDelegate, DeviceInfo } from 'srtc';

const observer: DeviceManagerDelegate = {
  onDeviceAdd: (device: DeviceInfo) => {
    console.info(`接入 ${device.kind}: ${device.name}`);
  },
  onDeviceRemove: (device: DeviceInfo) => {
    console.info(`移除 ${device.kind}: ${device.name}`);
  }
};

DeviceManager.shared.delegates.add(observer);
DeviceManager.shared.startMonitoring();

// 页面退出时
DeviceManager.shared.stopMonitoring();
DeviceManager.shared.delegates.remove(observer);

import { deviceListEquals, deviceListDiff } from 'srtc';

if (!deviceListEquals(prev, next)) {
  const diff = deviceListDiff(prev, next);
}

cameras count=2
  camera[0] id=device/0 name=Build_in Back (device/0)  kind=videoInput default=true
  camera[1] id=device/1 name=Build_in Front (device/1) kind=videoInput default=false
microphones count=1
  mic[0] id=2 name=Microphone (2) kind=audioInput default=true
speakers count=2