src/barcode/barcode_v4l.h

0001 /***************************************************************************
0002     Copyright (C) 2007-2009 Sebastian Held <sebastian.held@gmx.de>
0003  ***************************************************************************/
0004
0005 /***************************************************************************
0006  *                                                                         *
0007  *   This program is free software; you can redistribute it and/or         *
0008  *   modify it under the terms of the GNU General Public License as        *
0009  *   published by the Free Software Foundation; either version 2 of        *
0010  *   the License or (at your option) version 3 or any later version        *
0011  *   accepted by the membership of KDE e.V. (or its successor approved     *
0012  *   by the membership of KDE e.V.), which shall act as a proxy            *
0013  *   defined in Section 14 of version 3 of the license.                    *
0014  *                                                                         *
0015  *   This program is distributed in the hope that it will be useful,       *
0016  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
0017  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
0018  *   GNU General Public License for more details.                          *
0019  *                                                                         *
0020  *   You should have received a copy of the GNU General Public License     *
0021  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
0022  *                                                                         *
0023  ***************************************************************************/
0024
0025 #ifndef BARCODE_V4L_H
0026 #define BARCODE_V4L_H
0027
0028 //#define Barcode_DEBUG
0029
0030 #include <QString>
0031 #include <QImage>
0032
0033 // since this directory only gets built if ENABLE_WEBCAM is true
0034 // we know that either libv4l >= 0.8.3 or Linux < 2.6.38
0035 #include <linux/version.h>
0036 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
0037 #include <linux/types.h>
0038 #include <linux/videodev.h>
0039 #else
0040 #include <libv4l1-videodev.h>
0041 #endif
0042
0043 namespace barcodeRecognition {
0044
0045 struct ng_video_fmt {
0046   unsigned int   fmtid;         /* VIDEO_* */
0047   unsigned int   width;
0048   unsigned int   height;
0049   unsigned int   bytesperline;  /* zero for compressed formats */
0050 };
0051 enum { CAN_OVERLAY=1, CAN_CAPTURE=2, CAN_TUNE=4, NEEDS_CHROMAKEY=8 };
0052 enum { VIDEO_NONE=0, VIDEO_RGB08, VIDEO_GRAY, VIDEO_RGB15_LE, VIDEO_RGB16_LE,
0053         VIDEO_RGB15_BE, VIDEO_RGB16_BE, VIDEO_BGR24, VIDEO_BGR32, VIDEO_RGB24,
0054         VIDEO_RGB32, VIDEO_LUT2, VIDEO_LUT4, VIDEO_YUYV, VIDEO_YUV422P,
0055         VIDEO_YUV420P, VIDEO_MJPEG, VIDEO_JPEG, VIDEO_UYVY, VIDEO_FMT_COUNT };
0056 extern const char *device_cap[];
0057 extern const unsigned int ng_vfmt_to_depth[];
0058 extern const char* ng_vfmt_to_desc[];
0059
0060 /* lookup tables */
0061 #define CLIP         320
0062 extern unsigned int  ng_yuv_gray[256];
0063 extern unsigned int  ng_yuv_red[256];
0064 extern unsigned int  ng_yuv_blue[256];
0065 extern unsigned int  ng_yuv_g1[256];
0066 extern unsigned int  ng_yuv_g2[256];
0067 extern unsigned int  ng_clip[256 + 2 * CLIP];
0068 void ng_color_yuv2rgb_init();
0069
0070 class barcode_v4l
0071 {
0072 public:
0073   barcode_v4l();
0074   ~barcode_v4l();
0075   QImage grab_one2();
0076   bool isOpen();
0077
0078 protected:
0079   bool grab_init();
0080   int get_brightness_adj(unsigned char *image, long size, long *brightness);
0081
0082   QString m_devname;
0083   int m_fd;
0084   int m_grab_width, m_grab_height;
0085   video_capability m_capability;
0086   video_picture m_pict;
0087   video_window m_win;
0088   QByteArray *m_buffer;
0089   QImage *m_image;
0090 };
0091
0092 } // namespace
0093 #endif