v4l2_driver.c File Reference

V4L2 frameserver implementation. More...

#include "os/os_time.h"
#include "util/u_var.h"
#include "util/u_sink.h"
#include "util/u_misc.h"
#include "util/u_debug.h"
#include "util/u_format.h"
#include "util/u_logging.h"
#include "util/u_trace_marker.h"
#include "v4l2_interface.h"
#include "v4l2_driver.h"
#include <stdio.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:

Macros
#define	V_CONTROL_GET(VID, CONTROL)
#define	V_CONTROL_SET(VID, CONTROL, VALUE)
#define	ADD(CONTROL, WANT1, WANT2, WANT3, WANT4, NAME)
#define	CASE(CONTROL)    case V4L2_CID_##CONTROL: str = "V4L2_CID_" #CONTROL; break
#define	V_CHECK(FLAG)

Functions
static void *	v4l2_fs_mainloop (void *ptr)
	Streaming thread entrypoint. More...
static void	dump_controls (struct v4l2_fs *vid)
static void	dump_contron_name (uint32_t id)
static size_t	align_up (size_t size, size_t align)
static void	v4l2_free_frame (struct xrt_frame *xf)
static XRT_MAYBE_UNUSED int	v4l2_control_get (struct v4l2_fs *vid, uint32_t id, int *out_value)
static int	v4l2_control_set (struct v4l2_fs *vid, uint32_t id, int value)
static void	v4l2_add_control_state (struct v4l2_fs *vid, int control, struct v4l2_state_want want[2], int force, const char *name)
static int	v4l2_query_cap_and_validate (struct v4l2_fs *vid)
static int	v4l2_try_userptr (struct v4l2_fs *vid, struct v4l2_requestbuffers *v_bufrequest)
static int	v4l2_try_mmap (struct v4l2_fs *vid, struct v4l2_requestbuffers *v_bufrequest)
static int	v4l2_setup_mmap_buffer (struct v4l2_fs *vid, struct v4l2_frame *vf, struct v4l2_buffer *v_buf)
static int	v4l2_setup_userptr_buffer (struct v4l2_fs *vid, struct v4l2_frame *vf, struct v4l2_buffer *v_buf)
static struct v4l2_source_descriptor *	v4l2_add_descriptor (struct v4l2_fs *vid)
static void	v4l2_list_modes_interval (struct v4l2_fs *vid, const struct v4l2_fmtdesc *fmt, const struct v4l2_frmsizeenum *size, const struct v4l2_frmivalenum *interval)
static void	v4l2_list_modes_size (struct v4l2_fs *vid, const struct v4l2_fmtdesc *fmt, const struct v4l2_frmsizeenum *size)
static void	v4l2_list_modes_fmt (struct v4l2_fs *vid, const struct v4l2_fmtdesc *fmt)
static void	v4l2_list_modes (struct v4l2_fs *vid)
static void	v4l2_set_control_if_diff (struct v4l2_fs *vid, struct v4l2_control_state *state)
static void	v4l2_update_controls (struct v4l2_fs *vid)
bool	v4l2_fs_setup_format (struct v4l2_fs *vid)
static bool	v4l2_fs_enumerate_modes (struct xrt_fs *xfs, struct xrt_fs_mode **out_modes, uint32_t *out_count)
static bool	v4l2_fs_configure_capture (struct xrt_fs *xfs, struct xrt_fs_capture_parameters *cp)
static bool	v4l2_fs_stream_start (struct xrt_fs *xfs, struct xrt_frame_sink *xs, enum xrt_fs_capture_type capture_type, uint32_t descriptor_index)
static bool	v4l2_fs_stream_stop (struct xrt_fs *xfs)
static bool	v4l2_fs_is_running (struct xrt_fs *xfs)
static void	v4l2_fs_destroy (struct v4l2_fs *vid)
static void	v4l2_fs_node_break_apart (struct xrt_frame_node *node)
static void	v4l2_fs_node_destroy (struct xrt_frame_node *node)
struct xrt_fs *	v4l2_fs_create (struct xrt_frame_context *xfctx, const char *path, const char *product, const char *manufacturer, const char *serial)
	Create a v4l2 frameserver. More...
static void	dump_integer (struct v4l2_fs *vid, struct v4l2_queryctrl *queryctrl)
static void	dump_menu (struct v4l2_fs *vid, uint32_t id, uint32_t min, uint32_t max)

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

ADD

#define ADD	(		CONTROL,
			WANT1,
			WANT2,
			WANT3,
			WANT4,
			NAME
	)

Value:

        do {                                                                                                           \
                struct v4l2_state_want want[2] = {{WANT1, WANT2}, {WANT3, WANT4}};                                     \
                v4l2_add_control_state(vid, V4L2_CID_##CONTROL, want, 2, NAME);                                        \
        } while (false)

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) {                                         \
                        V4L2_ERROR(VID, "failed to get V4L2_CID_" #CONTROL);                                           \
                } else {                                                                                               \
                        V4L2_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) {                                           \
                        V4L2_ERROR(VID, "failed to set V4L2_CID_" #CONTROL);                                           \
                }                                                                                                      \
        } while (false);

Function Documentation

v4l2_fs_configure_capture()

static bool v4l2_fs_configure_capture ( struct xrt_fs *  xfs, struct xrt_fs_capture_parameters *  cp  )

static

Todo:

v4l2_fs_mainloop()

void * v4l2_fs_mainloop ( void *  ptr )

static

Streaming thread entrypoint.

Todo:

Sequence number and timestamp.