mediadevices/pkg/driver/manager.go

package driver

import "fmt"

type FilterFn func(Driver) bool

func FilterKind(k Kind) FilterFn {
	return func(d Driver) bool {
		return d.Info().Kind == k
	}
}

type manager struct {
	drivers map[string]Driver
}

// Manager is a singleton to manage multiple drivers and their states
var Manager = &manager{
	drivers: make(map[string]Driver),
}

func (m *manager) register(a Adapter) error {
	d := wrapAdapter(a)
	if d == nil {
		return fmt.Errorf("adapter has to be either VideoAdapter/AudioAdapter")
	}

	m.drivers[d.ID()] = d
	return nil
}

func (m *manager) Query(f FilterFn) []Driver {
	results := make([]Driver, 0)
	for _, d := range m.drivers {
		if ok := f(d); ok {
			results = append(results, d)
		}
	}

	return results
}