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deexcl@216.73.217.71: ~ $ 
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * generic helper functions for handling video4linux capture buffers
 *
 * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
 *
 * Highly based on video-buf written originally by:
 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
 * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
 * (c) 2006 Ted Walther and John Sokol
 */

#ifndef _VIDEOBUF_CORE_H
#define _VIDEOBUF_CORE_H

#include <linux/poll.h>
#include <linux/videodev2.h>

#define UNSET (-1U)


struct videobuf_buffer;
struct videobuf_queue;

/* --------------------------------------------------------------------- */

/*
 * A small set of helper functions to manage video4linux buffers.
 *
 * struct videobuf_buffer holds the data structures used by the helper
 * functions, additionally some commonly used fields for v4l buffers
 * (width, height, lists, waitqueue) are in there.  That struct should
 * be used as first element in the drivers buffer struct.
 *
 * about the mmap helpers (videobuf_mmap_*):
 *
 * The mmaper function allows to map any subset of contiguous buffers.
 * This includes one mmap() call for all buffers (which the original
 * video4linux API uses) as well as one mmap() for every single buffer
 * (which v4l2 uses).
 *
 * If there is a valid mapping for a buffer, buffer->baddr/bsize holds
 * userspace address + size which can be fed into the
 * videobuf_dma_init_user function listed above.
 *
 */

struct videobuf_mapping {
	unsigned int count;
	struct videobuf_queue *q;
};

enum videobuf_state {
	VIDEOBUF_NEEDS_INIT = 0,
	VIDEOBUF_PREPARED   = 1,
	VIDEOBUF_QUEUED     = 2,
	VIDEOBUF_ACTIVE     = 3,
	VIDEOBUF_DONE       = 4,
	VIDEOBUF_ERROR      = 5,
	VIDEOBUF_IDLE       = 6,
};

struct videobuf_buffer {
	unsigned int            i;
	u32                     magic;

	/* info about the buffer */
	unsigned int            width;
	unsigned int            height;
	unsigned int            bytesperline; /* use only if != 0 */
	unsigned long           size;
	enum v4l2_field         field;
	enum videobuf_state     state;
	struct list_head        stream;  /* QBUF/DQBUF list */

	/* touched by irq handler */
	struct list_head        queue;
	wait_queue_head_t       done;
	unsigned int            field_count;
	u64			ts;

	/* Memory type */
	enum v4l2_memory        memory;

	/* buffer size */
	size_t                  bsize;

	/* buffer offset (mmap + overlay) */
	size_t                  boff;

	/* buffer addr (userland ptr!) */
	unsigned long           baddr;

	/* for mmap'ed buffers */
	struct videobuf_mapping *map;

	/* Private pointer to allow specific methods to store their data */
	int			privsize;
	void                    *priv;
};

struct videobuf_queue_ops {
	int (*buf_setup)(struct videobuf_queue *q,
			 unsigned int *count, unsigned int *size);
	int (*buf_prepare)(struct videobuf_queue *q,
			   struct videobuf_buffer *vb,
			   enum v4l2_field field);
	void (*buf_queue)(struct videobuf_queue *q,
			  struct videobuf_buffer *vb);
	void (*buf_release)(struct videobuf_queue *q,
			    struct videobuf_buffer *vb);
};

#define MAGIC_QTYPE_OPS	0x12261003

/* Helper operations - device type dependent */
struct videobuf_qtype_ops {
	u32                     magic;

	struct videobuf_buffer *(*alloc_vb)(size_t size);
	void *(*vaddr)		(struct videobuf_buffer *buf);
	int (*iolock)		(struct videobuf_queue *q,
				 struct videobuf_buffer *vb,
				 struct v4l2_framebuffer *fbuf);
	int (*sync)		(struct videobuf_queue *q,
				 struct videobuf_buffer *buf);
	int (*mmap_mapper)	(struct videobuf_queue *q,
				 struct videobuf_buffer *buf,
				 struct vm_area_struct *vma);
};

struct videobuf_queue {
	struct mutex               vb_lock;
	struct mutex               *ext_lock;
	spinlock_t                 *irqlock;
	struct device		   *dev;

	wait_queue_head_t	   wait; /* wait if queue is empty */

	enum v4l2_buf_type         type;
	unsigned int               msize;
	enum v4l2_field            field;
	enum v4l2_field            last;   /* for field=V4L2_FIELD_ALTERNATE */
	struct videobuf_buffer     *bufs[VIDEO_MAX_FRAME];
	const struct videobuf_queue_ops  *ops;
	struct videobuf_qtype_ops  *int_ops;

	unsigned int               streaming:1;
	unsigned int               reading:1;

	/* capture via mmap() + ioctl(QBUF/DQBUF) */
	struct list_head           stream;

	/* capture via read() */
	unsigned int               read_off;
	struct videobuf_buffer     *read_buf;

	/* driver private data */
	void                       *priv_data;
};

static inline void videobuf_queue_lock(struct videobuf_queue *q)
{
	if (!q->ext_lock)
		mutex_lock(&q->vb_lock);
}

static inline void videobuf_queue_unlock(struct videobuf_queue *q)
{
	if (!q->ext_lock)
		mutex_unlock(&q->vb_lock);
}

int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb,
		int non_blocking, int intr);
int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
		struct v4l2_framebuffer *fbuf);

struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q);

/* Used on videobuf-dvb */
void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
			      struct videobuf_buffer *buf);

void videobuf_queue_core_init(struct videobuf_queue *q,
			 const struct videobuf_queue_ops *ops,
			 struct device *dev,
			 spinlock_t *irqlock,
			 enum v4l2_buf_type type,
			 enum v4l2_field field,
			 unsigned int msize,
			 void *priv,
			 struct videobuf_qtype_ops *int_ops,
			 struct mutex *ext_lock);
int  videobuf_queue_is_busy(struct videobuf_queue *q);
void videobuf_queue_cancel(struct videobuf_queue *q);

enum v4l2_field videobuf_next_field(struct videobuf_queue *q);
int videobuf_reqbufs(struct videobuf_queue *q,
		     struct v4l2_requestbuffers *req);
int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b);
int videobuf_qbuf(struct videobuf_queue *q,
		  struct v4l2_buffer *b);
int videobuf_dqbuf(struct videobuf_queue *q,
		   struct v4l2_buffer *b, int nonblocking);
int videobuf_streamon(struct videobuf_queue *q);
int videobuf_streamoff(struct videobuf_queue *q);

void videobuf_stop(struct videobuf_queue *q);

int videobuf_read_start(struct videobuf_queue *q);
void videobuf_read_stop(struct videobuf_queue *q);
ssize_t videobuf_read_stream(struct videobuf_queue *q,
			     char __user *data, size_t count, loff_t *ppos,
			     int vbihack, int nonblocking);
ssize_t videobuf_read_one(struct videobuf_queue *q,
			  char __user *data, size_t count, loff_t *ppos,
			  int nonblocking);
__poll_t videobuf_poll_stream(struct file *file,
				  struct videobuf_queue *q,
				  poll_table *wait);

int videobuf_mmap_setup(struct videobuf_queue *q,
			unsigned int bcount, unsigned int bsize,
			enum v4l2_memory memory);
int __videobuf_mmap_setup(struct videobuf_queue *q,
			unsigned int bcount, unsigned int bsize,
			enum v4l2_memory memory);
int videobuf_mmap_free(struct videobuf_queue *q);
int videobuf_mmap_mapper(struct videobuf_queue *q,
			 struct vm_area_struct *vma);

#endif

Filemanager

DIR : / usr/ src/ kernels/ 5.14.0-611.9.1.el9_7.x86_64/ include/ media/
Name Type Size Permission Actions
davinci Folder 0755
drv-intf Folder 0755
i2c Folder 0755
tpg Folder 0755
cec-notifier.h File 5.03 KB 0644
cec-pin.h File 2.79 KB 0644
cec.h File 17.87 KB 0644
demux.h File 22.69 KB 0644
dmxdev.h File 5.87 KB 0644
dvb-usb-ids.h File 19.46 KB 0644
dvb_ca_en50221.h File 4.35 KB 0644
dvb_demux.h File 10.77 KB 0644
dvb_frontend.h File 30.03 KB 0644
dvb_net.h File 2.25 KB 0644
dvb_ringbuffer.h File 8.32 KB 0644
dvb_vb2.h File 7.65 KB 0644
dvbdev.h File 14.43 KB 0644
frame_vector.h File 1.42 KB 0644
hevc-ctrls.h File 9.81 KB 0644
imx.h File 190 B 0644
jpeg.h File 500 B 0644
media-dev-allocator.h File 2.21 KB 0644
media-device.h File 17.65 KB 0644
media-devnode.h File 5.29 KB 0644
media-entity.h File 47.11 KB 0644
media-request.h File 11.96 KB 0644
rc-core.h File 12.27 KB 0644
rc-map.h File 14.41 KB 0644
rcar-fcp.h File 1.1 KB 0644
tuner-types.h File 7.54 KB 0644
tuner.h File 8.4 KB 0644
tveeprom.h File 3.3 KB 0644
v4l2-async.h File 11.27 KB 0644
v4l2-common.h File 19.96 KB 0644
v4l2-ctrls.h File 54.21 KB 0644
v4l2-dev.h File 20.11 KB 0644
v4l2-device.h File 18.61 KB 0644
v4l2-dv-timings.h File 9.08 KB 0644
v4l2-event.h File 6.01 KB 0644
v4l2-fh.h File 4.22 KB 0644
v4l2-flash-led-class.h File 5.75 KB 0644
v4l2-fwnode.h File 18.25 KB 0644
v4l2-h264.h File 2.85 KB 0644
v4l2-image-sizes.h File 827 B 0644
v4l2-ioctl.h File 33.52 KB 0644
v4l2-jpeg.h File 5.08 KB 0644
v4l2-mc.h File 7.78 KB 0644
v4l2-mediabus.h File 8.65 KB 0644
v4l2-mem2mem.h File 29.4 KB 0644
v4l2-rect.h File 5.71 KB 0644
v4l2-subdev.h File 73.22 KB 0644
videobuf-core.h File 6.81 KB 0644
videobuf-dma-contig.h File 909 B 0644
videobuf-dma-sg.h File 2.79 KB 0644
videobuf-vmalloc.h File 1.14 KB 0644
videobuf2-core.h File 51.92 KB 0644
videobuf2-dma-contig.h File 883 B 0644
videobuf2-dma-sg.h File 698 B 0644
videobuf2-dvb.h File 1.81 KB 0644
videobuf2-memops.h File 1.09 KB 0644
videobuf2-v4l2.h File 14.48 KB 0644
videobuf2-vmalloc.h File 509 B 0644
vsp1.h File 3.57 KB 0644