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// +build !cv2,!cv4
// Package camera.
package camera
import (
"fmt"
"image"
"image/color"
"image/draw"
"time"
"github.com/disintegration/imaging"
"github.com/korandiz/v4l"
"github.com/korandiz/v4l/fmt/mjpeg"
"github.com/pbnjay/pixfont"
im "github.com/gen2brain/cam2ip/image"
)
// Camera represents camera.
type Camera struct {
opts Options
camera *v4l.Device
}
// New returns new Camera for given camera index.
func New(opts Options) (camera *Camera, err error) {
camera = &Camera{}
camera.opts = opts
devices := v4l.FindDevices()
if len(devices) < opts.Index+1 {
err = fmt.Errorf("camera: no camera at index %d", opts.Index)
return
}
camera.camera, err = v4l.Open(devices[opts.Index].Path)
if err != nil {
err = fmt.Errorf("camera: %s", err.Error())
return
}
if camera.camera == nil {
err = fmt.Errorf("camera: can not open camera %d", opts.Index)
return
}
config, err := camera.camera.GetConfig()
if err != nil {
err = fmt.Errorf("camera: %s", err.Error())
return
}
config.Format = mjpeg.FourCC
config.Width = int(opts.Width)
config.Height = int(opts.Height)
err = camera.camera.SetConfig(config)
if err != nil {
err = fmt.Errorf("camera: %s", err.Error())
return
}
err = camera.camera.TurnOn()
if err != nil {
err = fmt.Errorf("camera: %s", err.Error())
return
}
return
}
// Read reads next frame from camera and returns image.
func (c *Camera) Read() (img image.Image, err error) {
buffer, err := c.camera.Capture()
if err != nil {
err = fmt.Errorf("camera: can not grab frame: %s", err.Error())
return
}
img, err = im.NewDecoder(buffer).Decode()
if err != nil {
err = fmt.Errorf("camera: %s", err.Error())
return
}
switch c.opts.Rotate {
case 90:
img = imaging.Rotate90(img)
case 180:
img = imaging.Rotate180(img)
case 270:
img = imaging.Rotate270(img)
}
if c.opts.Timestamp {
dimg, ok := img.(draw.Image)
if !ok {
err = fmt.Errorf("camera: %T is not a drawable image type", img)
return
}
pixfont.DrawString(dimg, 10, 10, time.Now().Format("2006-01-02 15:04:05"), color.White)
img = dimg
}
return
}
// GetProperty returns the specified camera property.
func (c *Camera) GetProperty(id int) float64 {
ret, _ := c.camera.GetControl(uint32(id))
return float64(ret)
}
// SetProperty sets a camera property.
func (c *Camera) SetProperty(id int, value float64) {
c.camera.SetControl(uint32(id), int32(value))
}
// Close closes camera.
func (c *Camera) Close() (err error) {
if c.camera == nil {
err = fmt.Errorf("camera: camera is not opened")
return
}
c.camera.TurnOff()
c.camera.Close()
c.camera = nil
return
}
|
