Add video file reader

video/video.go

@@ -0,0 +1,50 @@
+// Package video.
+package video
+
+import (
+	"fmt"
+	"image"
+
+	"github.com/lazywei/go-opencv/opencv"
+)
+
+// Video represents video.
+type Video struct {
+	video *opencv.Capture
+}
+
+// New returns new Video for given path.
+func New(filename string) (video *Video, err error) {
+	video = &Video{}
+
+	video.video = opencv.NewFileCapture(filename)
+	if video.video == nil {
+		err = fmt.Errorf("video: can not open video %s", filename)
+	}
+
+	return
+}
+
+// Read reads next frame from video and returns image.
+func (v *Video) Read() (img image.Image, err error) {
+	if v.video.GrabFrame() {
+		frame := v.video.RetrieveFrame(1)
+		img = frame.ToImage()
+	} else {
+		err = fmt.Errorf("video: can not grab frame")
+	}
+
+	return
+}
+
+// Close closes video.
+func (v *Video) Close() (err error) {
+	if v.video == nil {
+		err = fmt.Errorf("video: video is not opened")
+		return
+	}
+
+	v.video.Release()
+	v.video = nil
+	return
+}