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add decode motion jpeg #24

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add decode motion jpeg #24

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12 changes: 10 additions & 2 deletions examples/http_mjpeg_streamer/webcam.go
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
// Example program that uses blakjack/webcam library
// for working with V4L2 devices.
// for working with V4L2 devices and JPEG stream.
package main

import (
Expand All @@ -23,6 +23,7 @@ import (
const (
V4L2_PIX_FMT_PJPG = 0x47504A50
V4L2_PIX_FMT_YUYV = 0x56595559
Motion_JPEG = 1196444237
)

type FrameSizes []webcam.FrameSize
Expand All @@ -46,6 +47,7 @@ func (slice FrameSizes) Swap(i, j int) {
var supportedFormats = map[webcam.PixelFormat]bool{
V4L2_PIX_FMT_PJPG: true,
V4L2_PIX_FMT_YUYV: true,
Motion_JPEG: true,
}

func main() {
Expand All @@ -70,7 +72,6 @@ func main() {
for _, s := range format_desc {
fmt.Fprintln(os.Stderr, s)
}

var format webcam.PixelFormat
FMT:
for f, s := range format_desc {
Expand Down Expand Up @@ -219,9 +220,16 @@ func encodeToImage(wc *webcam.Webcam, back chan struct{}, fi chan []byte, li cha

}
img = yuyv
case Motion_JPEG:
var err error
img, err = jpeg.Decode(bytes.NewBuffer(frame))
if err != nil {
log.Fatal("Error format jpeg: %v", err.Error)
}
default:
log.Fatal("invalid format ?")
}

//convert to jpeg
buf := &bytes.Buffer{}
if err := jpeg.Encode(buf, img, nil); err != nil {
Expand Down