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// Package v4l, a facade to the Video4Linux video capture interface
// Copyright (C) 2016 Zoltán Korándi <korandi.z@gmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//go:build linux
// +build linux
package v4l
import (
"os"
"path/filepath"
"syscall"
)
// FindDevices returns the DeviceInfo for every capture device found in the
// system. The paths are always returned in absolute form.
func FindDevices() []DeviceInfo {
var (
devs = make(map[int]string)
dInfos []DeviceInfo
)
filepath.Walk("/dev", func(path string, fInfo os.FileInfo, _ error) error {
if fInfo == nil || fInfo.Mode()&os.ModeCharDevice == 0 {
return nil
}
var stat syscall.Stat_t
if err := syscall.Stat(path, &stat); err != nil {
return nil
}
major, minor := int(stat.Rdev>>8), int(stat.Rdev&255)
if major != 81 {
return nil
}
if _, ok := devs[minor]; ok {
return nil
}
dev, err := Open(path)
if err != nil {
return nil
}
defer dev.Close()
dInfo, err := dev.DeviceInfo()
if err != nil {
return nil
}
dInfos = append(dInfos, dInfo)
devs[minor] = path
return nil
})
return dInfos
}
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