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// Example program that uses blakjack/webcam library
// for working with V4L2 devices.
// The application reads frames from device and writes them to stdout
// If your device supports motion formats (e.g. H264 or MJPEG) you can
// use it's output as a video stream.
// Example usage: go run stdout_streamer.go | vlc -
package main
import (
"fmt"
"image"
"image/jpeg"
"os"
"sort"
"github.com/blackjack/webcam"
)
func readChoice(s string) int {
var i int
for true {
print(s)
_, err := fmt.Scanf("%d\n", &i)
if err != nil || i < 1 {
println("Invalid input. Try again")
} else {
break
}
}
return i
}
type FrameSizes []webcam.FrameSize
func (slice FrameSizes) Len() int {
return len(slice)
}
//For sorting purposes
func (slice FrameSizes) Less(i, j int) bool {
ls := slice[i].MaxWidth * slice[i].MaxHeight
rs := slice[j].MaxWidth * slice[j].MaxHeight
return ls < rs
}
//For sorting purposes
func (slice FrameSizes) Swap(i, j int) {
slice[i], slice[j] = slice[j], slice[i]
}
func main() {
cam, err := webcam.Open("/dev/video0")
if err != nil {
panic(err.Error())
}
defer cam.Close()
format_desc := cam.GetSupportedFormats()
var formats []webcam.PixelFormat
for f := range format_desc {
formats = append(formats, f)
}
println("Available formats: ")
for i, value := range formats {
fmt.Fprintf(os.Stderr, "[%d] %s\n", i+1, format_desc[value])
}
choice := readChoice(fmt.Sprintf("Choose format [1-%d]: ", len(formats)))
format := formats[choice-1]
fmt.Fprintf(os.Stderr, "Supported frame sizes for format %s\n", format_desc[format])
frames := FrameSizes(cam.GetSupportedFrameSizes(format))
sort.Sort(frames)
for i, value := range frames {
fmt.Fprintf(os.Stderr, "[%d] %s\n", i+1, value.GetString())
}
choice = readChoice(fmt.Sprintf("Choose format [1-%d]: ", len(frames)))
size := frames[choice-1]
f, w, h, err := cam.SetImageFormat(format, uint32(size.MaxWidth), uint32(size.MaxHeight))
if err != nil {
panic(err.Error())
} else {
fmt.Fprintf(os.Stderr, "Resulting image format: %s (%dx%d)\n", format_desc[f], w, h)
}
println("Press Enter to start streaming")
fmt.Scanf("\n")
err = cam.StartStreaming()
if err != nil {
panic(err.Error())
}
timeout := uint32(5) //5 seconds
num := 0
for {
num++
err = cam.WaitForFrame(timeout)
switch err.(type) {
case nil:
case *webcam.Timeout:
fmt.Fprint(os.Stderr, err.Error())
continue
default:
panic(err.Error())
}
frame, err := cam.ReadFrame()
if len(frame) != 0 {
var img image.Image
yuyv := image.NewYCbCr(image.Rect(0, 0, int(w), int(h)), image.YCbCrSubsampleRatio422)
for i := range yuyv.Cb {
ii := i * 4
yuyv.Y[i*2] = frame[ii]
yuyv.Y[i*2+1] = frame[ii+2]
yuyv.Cb[i] = frame[ii+1]
yuyv.Cr[i] = frame[ii+3]
}
img = yuyv
file, _ := os.Create(fmt.Sprintf("%d.jpg", num))
defer file.Close()
err = jpeg.Encode(file, img, nil)
if err != nil {
fmt.Println(err)
}
fmt.Printf("%d.jpg\n", num)
// os.Stdout.Write(frame)
// os.Stdout.Sync()
} else if err != nil {
panic(err.Error())
}
}
}
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