v4l1_capture.h

   1 /*
   2     Copyright (C) 2008 Brian Johnson
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17 */
  18
  19 #ifndef _V4L1_CAPTURE_H
  20 #define _V4L1_CAPTURE_H
  21
  22 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  23 #define PAGE_ALIGN(len) ((((len) / 4096) + 1) * 4096)
  24
  25 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  26
  27 #define V4L1_BUFFER_SIZE        PAGE_ALIGN(640 * 480 * 4)
  28
  29 #define NUM_BUFFERS             5
  30
  31 #define info(format, arg...) syslog(LOG_INFO, "" format "", ## arg)
  32
  33
  34 struct v4l1_buffers {
  35         int offsets[NUM_BUFFERS];
  36         char* mem;
  37         size_t size;
  38 };
  39
  40 struct v4l2_buffers {
  41         struct v4l2_buffer buf;
  42         void *start;
  43 };
  44
  45 struct v4l1_device {
  46         int v4l1_fd;
  47         int v4l2_fd;
  48
  49         struct v4l1_buffers v4l1buffers;
  50         struct v4l2_buffers v4l2buffers[NUM_BUFFERS];
  51         struct v4l2_buffers *read_buffer;
  52 };
  53
  54 int v4l1_open(struct fusd_file_info *);
  55 int v4l1_close(struct fusd_file_info *);
  56 int v4l1_ioctl(struct fusd_file_info *, int, void *);
  57 int v4l1_read(struct fusd_file_info *, char *, size_t, loff_t *);
  58 int v4l1_mmap(struct fusd_file_info *, int, size_t, int, void **, size_t *);
  59
  60 int v4l2_request_buffers(struct v4l1_device *, int);
  61 int v4l2_free_buffers(struct v4l1_device *);
  62
  63 #endif