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m021_v4l2.h
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m021_v4l2.h
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/*
m021_v4l2.h : Header for LI-USB30-M021 V4L2 code
Copyright (C) 2016 Simon D. Levy
This file is part of M021_V4L2.
M021_V4L2 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 3 of the License, or
(at your option) any later version.
BreezySTM32 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with M021_V4L2. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef M021_H
#define M021_H
#include <linux/videodev2.h>
#include <libudev.h>
#include <pthread.h>
#include <stdint.h>
#include <stdbool.h>
// Error codes for reference
#define VDIN_OK 0
#define VDIN_DEVICE_ERR -1
#define VDIN_FORMAT_ERR -2
#define VDIN_REQBUFS_ERR -3
#define VDIN_ALLOC_ERR -4
#define VDIN_RESOL_ERR -5
#define VDIN_FBALLOC_ERR -6
#define VDIN_UNKNOWN_ERR -7
#define VDIN_DEQBUFS_ERR -8
#define VDIN_DECODE_ERR -9
#define VDIN_QUERYCAP_ERR -10
#define VDIN_QUERYBUF_ERR -11
#define VDIN_QBUF_ERR -12
#define VDIN_MMAP_ERR -13
#define VDIN_READ_ERR -14
#define VDIN_STREAMON_ERR -15
#define VDIN_STREAMOFF_ERR -16
#define VDIN_DYNCTRL_ERR -17
#define NB_BUFFER 4
typedef struct m021 {
pthread_mutex_t mutex;
struct udev *udev; // pointer to a udev struct (lib udev)
struct udev_monitor *udev_mon; // udev monitor
int udev_fd; // udev monitor file descriptor
int fd; // device file descriptor
struct v4l2_capability cap; // v4l2 capability struct
struct v4l2_format fmt; // v4l2 formar struct
struct v4l2_buffer buf; // v4l2 buffer struct
struct v4l2_requestbuffers rb; // v4l2 request buffers struct
struct v4l2_streamparm streamparm; // v4l2 stream parameters struct
void * mem[NB_BUFFER]; // memory buffers for mmap driver frames
uint32_t buff_length[NB_BUFFER]; // memory buffers length as set by VIDIOC_QUERYBUF
uint32_t buff_offset[NB_BUFFER]; // memory buffers offset as set by VIDIOC_QUERYBUF
int isstreaming; // video stream flag (1- ON 0- OFF)
int available_exp[4]; // backward compatible (old v4l2 exposure menu interface)
int format;
int width;
int height;
uint8_t * tmpbuffer; // temp buffer for decoding compressed data
uint8_t * tmpbuffer1; // temp buffer for converting bayer16 to bayer8
uint8_t * framebuffer; // frame buffer (YUYV)
} m021_t;
/**
* Initializes capture from M021 camera.
* @param id numerical id of camera: 0 -> /dev/video0, etc.
* @param m021 m021_t data structure to be initialized
* @width image width
* @height image height
* @return 0 on success, nonzero on error (see error codes in m021_v4l2.h)
* Width x Height possibilities are: 1280x720, 800x460, 640x480.
* This routine should be called on its own thread, separate from the thread on which the
* grab routines are called.
*/
int m021_init(int id, m021_t * m021, int width, int height);
/**
* Grabs a YUYV image from the M021 camera.
* @param m021 m021_t data structure intialized by m021_init
* @param frame pre-allocated image frame buffer of appropriate size
* @return 0 on success, nonzero on error (see error codes in m021_v4l2.h)
* This routine should be called a separate thread from the thread on which m021_init was called.
*/
int m021_grab_yuyv(m021_t * m021, uint8_t * frame);
/**
* Grabs a BGR image from the M021 camera.
* @param m021 m021_t data structure intialized by m021_init
* @param frame pre-allocated image frame buffer of appropriate size
* @param bcorrect color correction for blue
* @param gcorrect color correction for green
* @param rcorrect color correction for red
* @return 0 on success, nonzero on error (see error codes in m021_v4l2.h)
* This routine should be called a separate thread from the thread on which m021_init was called.
*/
int m021_grab_bgr(m021_t * m021, uint8_t * frame, int8_t bcorrect, int8_t gcorrect, int8_t rcorrect);
/**
* Frees storage allocated for m021 data structure.
* @param m021 pointer to m021_t data structure to be freed
* This routine should be called on its own thread, separate from the thread on which the
* grab routines are called.
*/
void m021_free(m021_t * m021);
#endif