237 lines
7.0 KiB
C
237 lines
7.0 KiB
C
/*
|
|
* generic helper functions for handling video4linux capture buffers
|
|
*
|
|
* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
|
|
*
|
|
* Highly based on video-buf written originally by:
|
|
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
|
|
* (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
|
|
* (c) 2006 Ted Walther and John Sokol
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2
|
|
*/
|
|
|
|
#include <linux/poll.h>
|
|
#ifdef CONFIG_VIDEO_V4L1_COMPAT
|
|
#include <linux/videodev.h>
|
|
#endif
|
|
#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 contingous 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 feeded into the
|
|
* videobuf_dma_init_user function listed above.
|
|
*
|
|
*/
|
|
|
|
struct videobuf_mapping {
|
|
unsigned int count;
|
|
unsigned long start;
|
|
unsigned long end;
|
|
struct videobuf_queue *q;
|
|
};
|
|
|
|
enum videobuf_state {
|
|
STATE_NEEDS_INIT = 0,
|
|
STATE_PREPARED = 1,
|
|
STATE_QUEUED = 2,
|
|
STATE_ACTIVE = 3,
|
|
STATE_DONE = 4,
|
|
STATE_ERROR = 5,
|
|
STATE_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;
|
|
unsigned int input;
|
|
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;
|
|
struct timeval 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;
|
|
|
|
void* (*alloc) (size_t size);
|
|
int (*iolock) (struct videobuf_queue* q,
|
|
struct videobuf_buffer *vb,
|
|
struct v4l2_framebuffer *fbuf);
|
|
int (*mmap) (struct videobuf_queue *q,
|
|
unsigned int *count,
|
|
unsigned int *size,
|
|
enum v4l2_memory memory);
|
|
int (*sync) (struct videobuf_queue* q,
|
|
struct videobuf_buffer *buf);
|
|
int (*video_copy_to_user)(struct videobuf_queue *q,
|
|
char __user *data,
|
|
size_t count,
|
|
int nonblocking);
|
|
int (*copy_stream) (struct videobuf_queue *q,
|
|
char __user *data,
|
|
size_t count,
|
|
size_t pos,
|
|
int vbihack,
|
|
int nonblocking);
|
|
int (*mmap_free) (struct videobuf_queue *q);
|
|
int (*mmap_mapper) (struct videobuf_queue *q,
|
|
struct vm_area_struct *vma);
|
|
};
|
|
|
|
struct videobuf_queue {
|
|
struct mutex lock;
|
|
spinlock_t *irqlock;
|
|
void *dev; /* on pci, points to struct pci_dev */
|
|
|
|
enum v4l2_buf_type type;
|
|
unsigned int inputs; /* for V4L2_BUF_FLAG_INPUT */
|
|
unsigned int msize;
|
|
enum v4l2_field field;
|
|
enum v4l2_field last; /* for field=V4L2_FIELD_ALTERNATE */
|
|
struct videobuf_buffer *bufs[VIDEO_MAX_FRAME];
|
|
struct videobuf_queue_ops *ops;
|
|
struct videobuf_qtype_ops *int_ops;
|
|
|
|
/* capture via mmap() + ioctl(QBUF/DQBUF) */
|
|
unsigned int streaming;
|
|
struct list_head stream;
|
|
|
|
/* capture via read() */
|
|
unsigned int reading;
|
|
unsigned int read_off;
|
|
struct videobuf_buffer *read_buf;
|
|
|
|
/* driver private data */
|
|
void *priv_data;
|
|
};
|
|
|
|
int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
|
|
int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
|
|
struct v4l2_framebuffer *fbuf);
|
|
|
|
void *videobuf_alloc(struct videobuf_queue* q);
|
|
|
|
void videobuf_queue_core_init(struct videobuf_queue *q,
|
|
struct videobuf_queue_ops *ops,
|
|
void *dev,
|
|
spinlock_t *irqlock,
|
|
enum v4l2_buf_type type,
|
|
enum v4l2_field field,
|
|
unsigned int msize,
|
|
void *priv,
|
|
struct videobuf_qtype_ops *int_ops);
|
|
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);
|
|
#ifdef CONFIG_VIDEO_V4L1_COMPAT
|
|
int videobuf_cgmbuf(struct videobuf_queue *q,
|
|
struct video_mbuf *mbuf, int count);
|
|
#endif
|
|
int videobuf_streamon(struct videobuf_queue *q);
|
|
int videobuf_streamoff(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);
|
|
unsigned int 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_free(struct videobuf_queue *q);
|
|
int videobuf_mmap_mapper(struct videobuf_queue *q,
|
|
struct vm_area_struct *vma);
|
|
|
|
/* --------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|