1 /* 2 * Copyright (c) 2011-2012 - Mauro Carvalho Chehab 3 * Copyright (c) 2012 - Andre Roth <neolynx@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU Lesser General Public License as published by 7 * the Free Software Foundation version 2.1 of the License. 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 Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html 18 * 19 */ 20 21 /** 22 * @file desc_hierarchy.h 23 * @ingroup descriptors 24 * @brief Provides the descriptors for the hierarchy descriptor 25 * @copyright GNU Lesser General Public License version 2.1 (LGPLv2.1) 26 * @author Mauro Carvalho Chehab 27 * @author Andre Roth 28 * 29 * @par Relevant specs 30 * The descriptor described herein is defined at: 31 * - ISO/IEC 13818-1 32 * 33 * @see 34 * 35 * @par Bug Report 36 * Please submit bug reports and patches to linux-media@vger.kernel.org 37 */ 38 39 #ifndef _HIERARCHY_H 40 #define _HIERARCHY_H 41 42 #include <libdvbv5/descriptors.h> 43 44 /** 45 * @struct dvb_desc_hierarchy 46 * @ingroup descriptors 47 * @brief Structure containing the hierarchy descriptor 48 * 49 * @param type descriptor tag 50 * @param length descriptor length 51 * @param next pointer to struct dvb_desc 52 * @param hierarchy_type hierarchy type 53 * @param layer hierarchy layer index 54 * @param embedded_layer hierarchy embedded layer index 55 * @param channel hierarchy channel 56 */ 57 struct dvb_desc_hierarchy { 58 uint8_t type; 59 uint8_t length; 60 struct dvb_desc *next; 61 62 uint8_t hierarchy_type:4; 63 uint8_t reserved:4; 64 65 uint8_t layer:6; 66 uint8_t reserved2:2; 67 68 uint8_t embedded_layer:6; 69 uint8_t reserved3:2; 70 71 uint8_t channel:6; 72 uint8_t reserved4:2; 73 } __attribute__((packed)); 74 75 struct dvb_v5_fe_parms; 76 77 #ifdef __cplusplus 78 extern "C" { 79 #endif 80 81 /** 82 * @brief Initializes and parses the hierarchy descriptor 83 * @ingroup descriptors 84 * 85 * @param parms struct dvb_v5_fe_parms pointer to the opened device 86 * @param buf buffer containing the descriptor's raw data 87 * @param desc pointer to struct dvb_desc to be allocated and filled 88 * 89 * This function initializes and makes sure that all fields will follow the CPU 90 * endianness. Due to that, the content of the buffer may change. 91 * 92 * Currently, no memory is allocated internally. 93 * 94 * @return On success, it returns the size of the allocated struct. 95 * A negative value indicates an error. 96 */ 97 int dvb_desc_hierarchy_init (struct dvb_v5_fe_parms *parms, 98 const uint8_t *buf, struct dvb_desc *desc); 99 100 /** 101 * @brief Prints the content of the hierarchy descriptor 102 * @ingroup descriptors 103 * 104 * @param parms struct dvb_v5_fe_parms pointer to the opened device 105 * @param desc pointer to struct dvb_desc 106 */ 107 void dvb_desc_hierarchy_print(struct dvb_v5_fe_parms *parms, 108 const struct dvb_desc *desc); 109 110 #ifdef __cplusplus 111 } 112 #endif 113 114 #endif 115