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