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add support for 8 bit greyscale to http streaming demo #50

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add support for 8 bit greyscale to http streaming demo #50

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11 changes: 11 additions & 0 deletions examples/http_mjpeg_streamer/webcam.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import (
"flag"
"fmt"
"image"
"image/color"
"image/jpeg"
"log"
"mime/multipart"
Expand All @@ -23,6 +24,7 @@ import (
const (
V4L2_PIX_FMT_PJPG = 0x47504A50
V4L2_PIX_FMT_YUYV = 0x56595559
V4L2_PIX_FMT_GREY = 0x59455247
)

type FrameSizes []webcam.FrameSize
Expand All @@ -46,6 +48,7 @@ func (slice FrameSizes) Swap(i, j int) {
var supportedFormats = map[webcam.PixelFormat]bool{
V4L2_PIX_FMT_PJPG: true,
V4L2_PIX_FMT_YUYV: true,
V4L2_PIX_FMT_GREY: true,
}

func main() {
Expand Down Expand Up @@ -219,6 +222,14 @@ func encodeToImage(wc *webcam.Webcam, back chan struct{}, fi chan []byte, li cha

}
img = yuyv
case V4L2_PIX_FMT_GREY:
gry := image.NewGray(image.Rect(0, 0, int(w), int(h)))
for i := 0; i < int(w); i++ {
for j := 0; j < int(h); j++ {
gry.Set(int(i), int(j), color.Gray{Y: frame[j*int(w)+i]})
}
}
img = gry
default:
log.Fatal("invalid format ?")
}
Expand Down