v4l2_driver.c File Reference

V4L2 frameserver implementation. More...

#include "os/os_time.h"
#include "util/u_var.h"
#include "util/u_misc.h"
#include "util/u_debug.h"
#include "util/u_format.h"
#include "v4l2_interface.h"
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <pthread.h>
#include <linux/videodev2.h>
#include <linux/v4l2-common.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <fcntl.h>

Include dependency graph for v4l2_driver.c:

Data Structures
struct	v4l2_frame
struct	v4l2_control_state
struct	v4l2_fs
	A single open v4l2 capture device, starts it's own thread and waits on it. More...

Macros
#define	V_SPEW(p, ...)
#define	V_DEBUG(p, ...)
#define	V_ERROR(p, ...)
#define	V_CONTROL_GET(VID, CONTROL)
#define	V_CONTROL_SET(VID, CONTROL, VALUE)
#define	NUM_V4L2_BUFFERS   3
#define	CASE(CONTROL)   case V4L2_CID_##CONTROL: str = "V4L2_CID_" #CONTROL; break
#define	V_CHECK(FLAG)

Functions
struct xrt_fs *	v4l2_fs_create (struct xrt_frame_context *xfctx, const char *path)
	Create a v4l2 frameserver. More...

Detailed Description

V4L2 frameserver implementation.

Author

Pete Black pblac.nosp@m.k@co.nosp@m.llabo.nosp@m.ra.c.nosp@m.om

Jakob Bornecrantz jakob.nosp@m.@col.nosp@m.labor.nosp@m.a.co.nosp@m.m

Macro Definition Documentation

CASE

#define CASE

(

CONTROL

)

case V4L2_CID_##CONTROL: str = "V4L2_CID_" #CONTROL; break

NUM_V4L2_BUFFERS

#define NUM_V4L2_BUFFERS   3

V_CHECK

#define V_CHECK

(

FLAG

)

Value:

do {                                                                   \
                if (queryctrl.flags & V4L2_CTRL_FLAG_##FLAG) {                 \
                        fprintf(stderr, ", " #FLAG);                           \
                }                                                              \
        } while (false)

V_CONTROL_GET

#define V_CONTROL_GET	(		VID,
			CONTROL
	)

Value:

do {                                                                   \
                int _value = 0;                                                \
                if (v4l2_control_get(VID, V4L2_CID_##CONTROL, &_value) != 0) { \
                        V_ERROR(VID, "failed to get V4L2_CID_" #CONTROL);      \
                } else {                                                       \
                        V_DEBUG(VID, "V4L2_CID_" #CONTROL " = %i", _value);    \
                }                                                              \
        } while (false);

V_CONTROL_SET

#define V_CONTROL_SET	(		VID,
			CONTROL,
			VALUE
	)

Value:

do {                                                                   \
                if (v4l2_control_set(VID, V4L2_CID_##CONTROL, VALUE) != 0) {   \
                        V_ERROR(VID, "failed to set V4L2_CID_" #CONTROL);      \
                }                                                              \
        } while (false);

V_DEBUG

#define V_DEBUG	(		p,
			...
	)

Value:

do {                                                                   \
                if (p->print_debug) {                                          \
                        fprintf(stderr, "%s - ", __func__);                    \
                        fprintf(stderr, __VA_ARGS__);                          \
                        fprintf(stderr, "\n");                                 \
                }                                                              \
        } while (false)

V_ERROR

#define V_ERROR	(		p,
			...
	)

Value:

do {                                                                   \
                fprintf(stderr, "%s - ", __func__);                            \
                fprintf(stderr, __VA_ARGS__);                                  \
                fprintf(stderr, "\n");                                         \
        } while (false)

V_SPEW

#define V_SPEW	(		p,
			...
	)

Value:

do {                                                                   \
                if (p->print_spew) {                                           \
                        fprintf(stderr, "%s - ", __func__);                    \
                        fprintf(stderr, __VA_ARGS__);                          \
                        fprintf(stderr, "\n");                                 \
                }                                                              \
        } while (false)