linux-dvb-apps.git - linux-dvb-apps Debian packaging

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/* * section and descriptor parser * * Copyright (C) 2005 Kenneth Aafloy (kenneth@linuxtv.org) * Copyright (C) 2005 Andrew de Quincey (adq_dvb@lidskialf.net) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef _UCSI_DVB_ANNOUNCEMENT_SUPPORT_DESCRIPTOR #define _UCSI_DVB_ANNOUNCEMENT_SUPPORT_DESCRIPTOR 1 #ifdef __cplusplus extern "C" { #endif #include <libucsi/descriptor.h> #include <libucsi/endianops.h> /** * Possible values for announcement_support_indicator. */ enum { DVB_ANNOUNCEMENT_SUPPORT_EMERGENCY = 0x01, DVB_ANNOUNCEMENT_SUPPORT_ROAD_TRAFFIC_FLASH = 0x02, DVB_ANNOUNCEMENT_SUPPORT_PUBLIC_TRANSPORT_FLASH = 0x04, DVB_ANNOUNCEMENT_SUPPORT_WARNING_MESSAGE = 0x08, DVB_ANNOUNCEMENT_SUPPORT_NEWS_FLASH = 0x10, DVB_ANNOUNCEMENT_SUPPORT_WEATHER_FLASH = 0x20, DVB_ANNOUNCEMENT_SUPPORT_EVENT_ANNOUNCEMENT = 0x40, DVB_ANNOUNCEMENT_SUPPORT_PERSONAL_CALL = 0x80, }; /** * Possible values for announcement_type. */ enum { DVB_ANNOUNCEMENT_TYPE_EMERGENCY = 0x00, DVB_ANNOUNCEMENT_TYPE_ROAD_TRAFFIC_FLASH = 0x01, DVB_ANNOUNCEMENT_TYPE_PUBLIC_TRANSPORT_FLASH = 0x02, DVB_ANNOUNCEMENT_TYPE_WARNING_MESSAGE = 0x03, DVB_ANNOUNCEMENT_TYPE_NEWS_FLASH = 0x04, DVB_ANNOUNCEMENT_TYPE_WEATHER_FLASH = 0x05, DVB_ANNOUNCEMENT_TYPE_EVENT_ANNOUNCEMENT = 0x06, DVB_ANNOUNCEMENT_TYPE_PERSONAL_CALL = 0x07, }; /** * Possible values for reference_type. */ enum { DVB_REFERENCE_TYPE_AUDIO = 0x00, DVB_REFERENCE_TYPE_OTHER_AUDIO = 0x01, DVB_REFERENCE_TYPE_OTHER_SERVICE = 0x02, DVB_REFERENCE_TYPE_OTHER_TS = 0x03, }; /** * dvb_announcement_support_descriptor structure. */ struct dvb_announcement_support_descriptor { struct descriptor d; uint16_t announcement_support_indicator; /* struct dvb_announcement_support_entry entries[] */ } __ucsi_packed; /** * An entry in the entries field of a dvb_announcement_support_descriptor. */ struct dvb_announcement_support_entry { EBIT3(uint8_t announcement_type : 4; , uint8_t reserved : 1; , uint8_t reference_type : 3; ); /* Only if reference_type == 1, 2 or 3: * struct dvb_announcement_support_reference reference */ } __ucsi_packed; /** * The optional reference field only present in a dvb_announcement_support_descriptor if * its reference_type field is 1,2 or 3. */ struct dvb_announcement_support_reference { uint16_t original_network_id; uint16_t transport_stream_id; uint16_t service_id; uint8_t component_tag; } __ucsi_packed; /** * Process a dvb_announcement_support_descriptor. * * @param d Generic descriptor pointer. * @return dvb_announcement_support_descriptor pointer, or NULL on error. */ static inline struct dvb_announcement_support_descriptor* dvb_announcement_support_descriptor_codec(struct descriptor* d) { uint32_t pos = 0; uint8_t* buf = (uint8_t*) d + 2; uint32_t len = d->len; if (len < (sizeof(struct dvb_announcement_support_descriptor) - 2)) return NULL; bswap16(buf+pos); pos += 2; while(pos < len) { struct dvb_announcement_support_entry *e = (struct dvb_announcement_support_entry*) (buf+pos); pos += sizeof(struct dvb_announcement_support_entry); if (pos > len) return NULL; if ((e->reference_type == 1) || (e->reference_type == 2) || (e->reference_type == 3)) { if ((pos + sizeof(struct dvb_announcement_support_reference)) > len) return NULL; bswap16(buf+pos); bswap16(buf+pos+2); bswap16(buf+pos+4); pos += sizeof(struct dvb_announcement_support_reference); } } return (struct dvb_announcement_support_descriptor*) d; } /** * Iterator for the entries field of a dvb_announcement_support_descriptor. * * @param d dvb_announcement_support_descriptor pointer. * @param pod Variable holding a pointer to the current dvb_announcement_support_entry. */ #define dvb_announcement_support_descriptor_entries_for_each(d, pos) \ for ((pos) = dvb_announcement_support_descriptor_entries_first(d); \ (pos); \ (pos) = dvb_announcement_support_descriptor_entries_next(d, pos)) /** * Accessor for the reference field of a dvb_announcement_support_entry if present. * * @param entry dvb_announcement_support_entry pointer. * @return dvb_announcement_support_reference pointer, or NULL on error. */ static inline struct dvb_announcement_support_reference* dvb_announcement_support_entry_reference(struct dvb_announcement_support_entry* entry) { if ((entry->reference_type != 0x01) && (entry->reference_type != 0x02) && (entry->reference_type != 0x03)) return NULL; return (struct dvb_announcement_support_reference*) ((uint8_t*) entry + sizeof(struct dvb_announcement_support_entry)); } /******************************** PRIVATE CODE ********************************/ static inline struct dvb_announcement_support_entry* dvb_announcement_support_descriptor_entries_first(struct dvb_announcement_support_descriptor *d) { if (d->d.len == 2) return NULL; return (struct dvb_announcement_support_entry *) ((uint8_t*) d + sizeof(struct dvb_announcement_support_descriptor)); } static inline struct dvb_announcement_support_entry* dvb_announcement_support_descriptor_entries_next(struct dvb_announcement_support_descriptor *d, struct dvb_announcement_support_entry *pos) { uint8_t *end = (uint8_t*) d + 2 + d->d.len; uint8_t* next = (uint8_t*) pos + sizeof(struct dvb_announcement_support_entry); struct dvb_announcement_support_reference* reference = dvb_announcement_support_entry_reference(pos); if (reference) next += sizeof(struct dvb_announcement_support_reference); if (next >= end) return NULL; return (struct dvb_announcement_support_entry *) next; } #ifdef __cplusplus } #endif #endif


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