/***************************************************************************** * desc_45.h: ETSI EN 300 458 Descriptor 0x45: VBI data descriptor ***************************************************************************** * Copyright (C) 2011 Unix Solutions Ltd. * * Authors: Georgi Chorbadzhiyski * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject * to the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *****************************************************************************/ /* * Normative references: * - ETSI EN 300 458 V1.11.1 (2010-04) (SI in DVB systems) */ #ifndef __BITSTREAM_DVB_DESC_45_H__ #define __BITSTREAM_DVB_DESC_45_H__ #include #include #ifdef __cplusplus extern "C" { #endif /***************************************************************************** * Descriptor 0x45: VBI data descriptor *****************************************************************************/ #define DESC45_HEADER_SIZE DESC_HEADER_SIZE #define DESC45_DATA_SIZE 2 static inline void desc45_init(uint8_t *p_desc) { desc_set_tag(p_desc, 0x45); } static inline void desc45n_set_service_id(uint8_t *p_desc_n, uint8_t i_service_id) { p_desc_n[0] = i_service_id; } static inline uint8_t desc45n_get_service_id(const uint8_t *p_desc_n) { return p_desc_n[0]; } static inline void desc45n_set_data_length(uint8_t *p_desc_n, uint8_t i_length) { p_desc_n[1] = i_length; } static inline uint8_t desc45n_get_data_length(const uint8_t *p_desc_n) { return p_desc_n[1]; } static inline const char *desc45_get_service_id_txt(uint8_t i_service_id) { return i_service_id == 0x00 ? "reserved" : i_service_id == 0x01 ? "EBU teletext" : i_service_id == 0x02 ? "inverted teletext" : i_service_id == 0x03 ? "reserved" : i_service_id == 0x04 ? "VPS" : i_service_id == 0x05 ? "WSS" : i_service_id == 0x06 ? "Closed Captioning" : i_service_id == 0x07 ? "Mono 4:2:2 samples" : "reserved"; } static inline uint8_t desc45n_get_byte(uint8_t *p_desc_n, uint8_t idx) { return p_desc_n[idx + 2]; } static inline void desc45n_set_byte(uint8_t *p_desc_n, uint8_t idx, uint8_t i_byte) { p_desc_n[idx + 2] = i_byte; } static inline bool desc45n_get_field_parity(const uint8_t *p_desc_n, uint8_t idx) { return (p_desc_n[idx + 2] & 0x20) == 0x20; } static inline void desc45n_set_field_parity(uint8_t *p_desc_n, uint8_t idx, bool b_parity) { p_desc_n[idx + 2] = 0xc0 | (b_parity ? (p_desc_n[idx + 2] | 0x20) : (p_desc_n[idx + 2] &~ 0x20)); } static inline uint8_t desc45n_get_line_offset(const uint8_t *p_desc_n, uint8_t idx) { return p_desc_n[idx + 2] & 0x1f; } static inline void desc45n_set_line_offset(uint8_t *p_desc_n, uint8_t idx, uint8_t i_line_offset) { p_desc_n[idx + 2] = 0xc0 | (p_desc_n[idx + 2] & 0x20) | (i_line_offset & 0x1f); } static inline uint8_t *desc45_get_data(uint8_t *p_desc, uint8_t n) { uint8_t *p_desc_n = p_desc + DESC45_HEADER_SIZE; uint8_t i_desc_size = desc_get_length(p_desc); while (n) { if (p_desc_n + DESC45_DATA_SIZE - p_desc > i_desc_size) return NULL; p_desc_n += DESC45_DATA_SIZE + desc45n_get_data_length(p_desc_n); n--; } if (p_desc_n - p_desc > i_desc_size) return NULL; return p_desc_n; } static inline bool desc45_validate(const uint8_t *p_desc) { const uint8_t *p_desc_n = p_desc + DESC45_HEADER_SIZE; int i_desc_size = desc_get_length(p_desc); while (i_desc_size > 0) { uint8_t i_data_sz = DESC45_DATA_SIZE + desc45n_get_data_length(p_desc_n); i_desc_size -= i_data_sz; p_desc_n += i_data_sz; } return i_desc_size == 0; } static inline void desc45_print(uint8_t *p_desc, f_print pf_print, void *opaque, print_type_t i_print_type) { uint8_t j = 0; uint8_t *p_desc_n; if (i_print_type == PRINT_XML) pf_print(opaque, ""); while ((p_desc_n = desc45_get_data(p_desc, j++)) != NULL) { uint8_t k; uint8_t i_service_id = desc45n_get_service_id(p_desc_n); uint8_t i_service_len = desc45n_get_data_length(p_desc_n); switch (i_print_type) { case PRINT_XML: pf_print(opaque, "", i_service_id, i_service_len, desc45_get_service_id_txt(i_service_id) ); for (k = 0; k < i_service_len; k++) { if (i_service_id >= 1 && i_service_id <= 7 && i_service_id != 3) { pf_print(opaque, "", desc45n_get_field_parity(p_desc_n, k), desc45n_get_line_offset(p_desc_n, k)); } else { pf_print(opaque, "", desc45n_get_byte(p_desc_n, k)); } } pf_print(opaque, ""); break; default: pf_print(opaque, " - desc 45 vbi_data service_id=0x%02x length=%u service_txt=\"%s\"", i_service_id, i_service_len, desc45_get_service_id_txt(i_service_id)); for (k = 0; k < i_service_len; k++) { if (i_service_id >= 1 && i_service_id <= 7 && i_service_id != 3) { pf_print(opaque, " - vbi_data field_parity=%u line_offset=%u", desc45n_get_field_parity(p_desc_n, k), desc45n_get_line_offset(p_desc_n, k)); } else { pf_print(opaque, " - vbi_data reserved_byte=0x%02x", desc45n_get_byte(p_desc_n, k)); } } } } if (i_print_type == PRINT_XML) pf_print(opaque, ""); } #ifdef __cplusplus } #endif #endif