1 /* 2 * Copyright (c) 2013 - Andre Roth <neolynx@gmail.com> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU Lesser General Public License as published by 6 * the Free Software Foundation version 2.1 of the License. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU Lesser General Public License for more details. 12 * 13 * You should have received a copy of the GNU Lesser General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 16 * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html 17 * 18 * Described at ETSI EN 300 468 V1.11.1 (2010-04) 19 */ 20 21 /** 22 * @file desc_ca.h 23 * @ingroup descriptors 24 * @brief Provides the descriptors for Conditional Access 25 * @copyright GNU Lesser General Public License version 2.1 (LGPLv2.1) 26 * @author Andre Roth 27 * 28 * @par Relevant specs 29 * The descriptor described herein is defined at: 30 * - ETSI EN 300 468 V1.11.1 (2010-04) 31 * 32 * @see http://www.etherguidesystems.com/help/sdos/mpeg/semantics/mpeg-2/descriptors/CA_descriptor.aspx 33 * 34 * @par Bug Report 35 * Please submit bug reports and patches to linux-media@vger.kernel.org 36 */ 37 38 #ifndef _CA_H 39 #define _CA_H 40 41 #include <libdvbv5/descriptors.h> 42 43 /** 44 * @struct dvb_desc_ca 45 * @ingroup descriptors 46 * @brief Contains the private data for Conditional Access 47 * 48 * @param type descriptor tag 49 * @param length descriptor length 50 * @param next pointer to struct dvb_desc 51 * @param ca_id Conditional Access ID 52 * @param ca_pid Conditional Access ID 53 * @param privdata pointer to private data buffer 54 * @param privdata_len length of the private data 55 */ 56 struct dvb_desc_ca { 57 uint8_t type; 58 uint8_t length; 59 struct dvb_desc *next; 60 61 uint16_t ca_id; 62 union { 63 uint16_t bitfield1; 64 struct { 65 uint16_t ca_pid:13; 66 uint16_t reserved:3; 67 } __attribute__((packed)); 68 } __attribute__((packed)); 69 70 uint8_t *privdata; 71 uint8_t privdata_len; 72 } __attribute__((packed)); 73 74 struct dvb_v5_fe_parms; 75 76 /** @brief initial descriptor field at dvb_desc_ca struct */ 77 #define dvb_desc_ca_field_first ca_id 78 /** @brief last descriptor field at dvb_desc_ca struct */ 79 #define dvb_desc_ca_field_last privdata 80 81 #ifdef __cplusplus 82 extern "C" { 83 #endif 84 85 /** 86 * @brief Initializes and parses the CA descriptor 87 * @ingroup descriptors 88 * 89 * @param parms struct dvb_v5_fe_parms pointer to the opened device 90 * @param buf buffer containing the descriptor's raw data 91 * @param desc pointer to struct dvb_desc to be allocated and filled 92 * 93 * This function allocates a the descriptor and fills the fields inside 94 * the struct. It also makes sure that all fields will follow the CPU 95 * endianness. Due to that, the content of the buffer may change. 96 * 97 * @return On success, it returns the size of the allocated struct. 98 * A negative value indicates an error. 99 */ 100 int dvb_desc_ca_init(struct dvb_v5_fe_parms *parms, const uint8_t *buf, 101 struct dvb_desc *desc); 102 103 /** 104 * @brief Prints the content of the CA descriptor 105 * @ingroup descriptors 106 * 107 * @param parms struct dvb_v5_fe_parms pointer to the opened device 108 * @param desc pointer to struct dvb_desc 109 */ 110 void dvb_desc_ca_print(struct dvb_v5_fe_parms *parms, 111 const struct dvb_desc *desc); 112 113 /** 114 * @brief Frees all data allocated by the CA descriptor 115 * @ingroup descriptors 116 * 117 * @param desc pointer to struct dvb_desc to be freed 118 */ 119 void dvb_desc_ca_free(struct dvb_desc *desc); 120 121 #ifdef __cplusplus 122 } 123 #endif 124 125 #endif 126