1 /* 2 * Raw VBI to sliced VBI parser. 3 * 4 * The slicing code was copied from libzvbi. The original copyright notice is: 5 * 6 * Copyright (C) 2000-2004 Michael H. Schimek 7 * 8 * The vbi_prepare/vbi_parse functions are: 9 * 10 * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com> 11 * 12 * This library is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU Library General Public 14 * License as published by the Free Software Foundation; either 15 * version 2 of the License, or (at your option) any later version. 16 * 17 * This library is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 20 * Library General Public License for more details. 21 * 22 * You should have received a copy of the GNU Library General Public 23 * License along with this library; if not, write to the 24 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 25 * Boston, MA 02110-1301 USA. 26 */ 27 28 #ifndef _RAW2SLICED_H 29 #define _RAW2SLICED_H 30 31 #include <linux/videodev2.h> 32 33 #define VBI_MAX_SERVICES (3) 34 35 // Bit slicer internal struct 36 struct vbi_bit_slicer { 37 unsigned int service; 38 unsigned int cri; 39 unsigned int cri_mask; 40 unsigned int thresh; 41 unsigned int thresh_frac; 42 unsigned int cri_samples; 43 unsigned int cri_rate; 44 unsigned int oversampling_rate; 45 unsigned int phase_shift; 46 unsigned int step; 47 unsigned int frc; 48 unsigned int frc_bits; 49 unsigned int payload; 50 unsigned int endian; 51 }; 52 53 struct vbi_handle { 54 unsigned services; 55 unsigned start_of_field_2; 56 unsigned stride; 57 bool interlaced; 58 int start[2]; 59 int count[2]; 60 struct vbi_bit_slicer slicers[VBI_MAX_SERVICES]; 61 }; 62 63 // Fills in vbi_handle based on the standard and VBI format 64 // Returns true if one or more services are valid for the fmt/std combination. 65 bool vbi_prepare(struct vbi_handle *vh, 66 const struct v4l2_vbi_format *fmt, v4l2_std_id std); 67 68 // Parses the raw buffer and fills in sliced_vbi_format and _data. 69 // data must be an array of count[0] + count[1] v4l2_sliced_vbi_data structs. 70 void vbi_parse(struct vbi_handle *vh, const unsigned char *buf, 71 struct v4l2_sliced_vbi_format *vbi, 72 struct v4l2_sliced_vbi_data *data); 73 74 #endif 75