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Support MJPG pixel format #63

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31 changes: 20 additions & 11 deletions examples/http_mjpeg_streamer/webcam.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ import (

const (
V4L2_PIX_FMT_PJPG = 0x47504A50
V4L2_PIX_FMT_MJPG = 0x47504A4D
V4L2_PIX_FMT_YUYV = 0x56595559
)

Expand All @@ -31,21 +32,22 @@ func (slice FrameSizes) Len() int {
return len(slice)
}

//For sorting purposes
// 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
// For sorting purposes
func (slice FrameSizes) Swap(i, j int) {
slice[i], slice[j] = slice[j], slice[i]
}

var supportedFormats = map[webcam.PixelFormat]bool{
V4L2_PIX_FMT_PJPG: true,
V4L2_PIX_FMT_YUYV: true,
V4L2_PIX_FMT_MJPG: true,
}

func main() {
Expand Down Expand Up @@ -127,6 +129,11 @@ FMT:
}
fmt.Fprintf(os.Stderr, "Resulting image format: %s %dx%d\n", format_desc[f], w, h)

fmt.Println("Supported framerates for", format, size)
for _, rate := range cam.GetSupportedFramerates(format, uint32(size.MaxWidth), uint32(size.MaxHeight)) {
fmt.Println(rate)
}

// start streaming
err = cam.StartStreaming()
if err != nil {
Expand All @@ -146,14 +153,15 @@ FMT:
go httpVideo(*addr, li)
}

timeout := uint32(5) //5 seconds
timeout := uint32(5) // 5 seconds
start := time.Now()
var fr time.Duration

for {
err = cam.WaitForFrame(timeout)
if err != nil {
log.Println(err)
continue
return
}

Expand Down Expand Up @@ -197,7 +205,6 @@ func encodeToImage(wc *webcam.Webcam, back chan struct{}, fi chan []byte, li cha

var (
frame []byte
img image.Image
)
for {
bframe := <-fi
Expand All @@ -208,6 +215,9 @@ func encodeToImage(wc *webcam.Webcam, back chan struct{}, fi chan []byte, li cha
copy(frame, bframe)
back <- struct{}{}

// buf holds frame as jpeg
buf := &bytes.Buffer{}

switch format {
case V4L2_PIX_FMT_YUYV:
yuyv := image.NewYCbCr(image.Rect(0, 0, int(w), int(h)), image.YCbCrSubsampleRatio422)
Expand All @@ -219,16 +229,15 @@ func encodeToImage(wc *webcam.Webcam, back chan struct{}, fi chan []byte, li cha
yuyv.Cr[i] = frame[ii+3]

}
img = yuyv
if err := jpeg.Encode(buf, yuyv, nil); err != nil {
log.Fatal(err)
return
}
case V4L2_PIX_FMT_MJPG:
buf.Write(frame)
default:
log.Fatal("invalid format ?")
}
//convert to jpeg
buf := &bytes.Buffer{}
if err := jpeg.Encode(buf, img, nil); err != nil {
log.Fatal(err)
return
}

const N = 50
// broadcast image up to N ready clients
Expand Down