Add patch

[YouROK]

Please add patch, I add some ioctls functions, get/set controls

[YouROK]

0001-add-ioctl-funcs.patch.zip

[YouROK]

From f5e157e649e2353b86e5161b0c7526eab8c61d85 Mon Sep 17 00:00:00 2001
From: YouROK
Date: Tue, 27 Jun 2017 21:38:10 +0300
Subject: [PATCH] add ioctl funcs

---

v4l2.go | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
webcam.go | 8 ++++++++
2 files changed, 68 insertions(+), 7 deletions(-)

diff --git a/v4l2.go b/v4l2.go
index 3770550..244d969 100644
--- a/v4l2.go
+++ b/v4l2.go
@@ -23,14 +23,23 @@ const (
V4L2_FRMSIZE_TYPE_STEPWISE uint32 = 3
)

+const (

• V4L2_CID_BASE uint32 = 0x00980900
• V4L2_CID_AUTO_WHITE_BALANCE uint32 = V4L2_CID_BASE + 12
• V4L2_CID_PRIVATE_BASE uint32 = 0x08000000
  +)

var (

• VIDIOC_QUERYCAP = ioctl.IoR(uintptr('V'), 0, unsafe.Sizeof(v4l2_capability{}))
• VIDIOC_ENUM_FMT = ioctl.IoRW(uintptr('V'), 2, unsafe.Sizeof(v4l2_fmtdesc{}))
• VIDIOC_S_FMT = ioctl.IoRW(uintptr('V'), 5, unsafe.Sizeof(v4l2_format{}))
• VIDIOC_REQBUFS = ioctl.IoRW(uintptr('V'), 8, unsafe.Sizeof(v4l2_requestbuffers{}))
• VIDIOC_QUERYBUF = ioctl.IoRW(uintptr('V'), 9, unsafe.Sizeof(v4l2_buffer{}))
• VIDIOC_QBUF = ioctl.IoRW(uintptr('V'), 15, unsafe.Sizeof(v4l2_buffer{}))
• VIDIOC_DQBUF = ioctl.IoRW(uintptr('V'), 17, unsafe.Sizeof(v4l2_buffer{}))

• VIDIOC_QUERYCAP = ioctl.IoR(uintptr('V'), 0, unsafe.Sizeof(v4l2_capability{}))
• VIDIOC_ENUM_FMT = ioctl.IoRW(uintptr('V'), 2, unsafe.Sizeof(v4l2_fmtdesc{}))
• VIDIOC_S_FMT = ioctl.IoRW(uintptr('V'), 5, unsafe.Sizeof(v4l2_format{}))
• VIDIOC_REQBUFS = ioctl.IoRW(uintptr('V'), 8, unsafe.Sizeof(v4l2_requestbuffers{}))
• VIDIOC_QUERYBUF = ioctl.IoRW(uintptr('V'), 9, unsafe.Sizeof(v4l2_buffer{}))
• VIDIOC_QBUF = ioctl.IoRW(uintptr('V'), 15, unsafe.Sizeof(v4l2_buffer{}))
• VIDIOC_DQBUF = ioctl.IoRW(uintptr('V'), 17, unsafe.Sizeof(v4l2_buffer{}))
• VIDIOC_S_CTRL = ioctl.IoRW(uintptr('V'), 28, unsafe.Sizeof(v4l2_control{}))
• VIDIOC_QUERYCTRL = ioctl.IoRW(uintptr('V'), 36, unsafe.Sizeof(v4l2_queryctrl{}))
• //sizeof int32
  VIDIOC_STREAMON = ioctl.IoW(uintptr('V'), 18, 4)
  VIDIOC_ENUM_FRAMESIZES = ioctl.IoRW(uintptr('V'), 74, unsafe.Sizeof(v4l2_frmsizeenum{}))
  @@ -138,6 +147,50 @@ type v4l2_timecode struct {
  userbits [4]uint8
  }

+type v4l2_queryctrl struct {

• id uint32
• _type uint32
• name [32]uint8
• minimum int32
• maximum int32
• step int32
• default_value int32
• flags uint32
• reserved [2]uint32
  +}

+type v4l2_control struct {

• id uint32
• value int32
  +}

+func setControl(fd uintptr, id uint32, val int32) error {

• ctrl := &v4l2_control{}
• ctrl.id = id
• ctrl.value = val
• return ioctl.Ioctl(fd, VIDIOC_S_CTRL, uintptr(unsafe.Pointer(ctrl)))
  +}

+func getControls(fd uintptr) map[uint32]string {

• query := &v4l2_queryctrl{}
• var controls map[uint32]string
• var err error
• for query.id = V4L2_CID_BASE; err == nil; query.id++ {

•   err = ioctl.Ioctl(fd, VIDIOC_QUERYCTRL, uintptr(unsafe.Pointer(query)))
  

•   if err == nil {
  

•   	controls[query.id] = CToGoString(query.name[:])
  

•   }
  

• }
• err = nil
• for query.id = V4L2_CID_PRIVATE_BASE; err == nil; query.id++ {

•   err = ioctl.Ioctl(fd, VIDIOC_QUERYCTRL, uintptr(unsafe.Pointer(query)))
  

•   if err == nil {
  

•   	controls[query.id] = CToGoString(query.name[:])
  

•   }
  

• }
• return controls
  +}

func checkCapabilities(fd uintptr) (supportsVideoCapture bool, supportsVideoStreaming bool, err error) {

caps := &v4l2_capability{}

diff --git a/webcam.go b/webcam.go
index f992c42..a2a89d8 100644
--- a/webcam.go
+++ b/webcam.go
@@ -116,6 +116,14 @@ func (w *Webcam) SetImageFormat(f PixelFormat, width, height uint32) (PixelForma
}
}

+func (w *Webcam) SetAutoWhiteBalance(val bool) error {

• v := int32(0)
• if val {

•   v = 1
  

• }
• return setControl(w.fd, V4L2_CID_AUTO_WHITE_BALANCE, v)
  +}

// Start streaming process
func (w *Webcam) StartStreaming() error {

--
2.11.0

[blackjack]

Done. Thanks for your effort!