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108 lines
2.8 KiB
108 lines
2.8 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_FREQUENCY_LIST_DESCRIPTOR
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#define _UCSI_DVB_FREQUENCY_LIST_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 coding_type.
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*/
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enum {
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DVB_CODING_TYPE_SATELLITE = 0x01,
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DVB_CODING_TYPE_CABLE = 0x02,
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DVB_CODING_TYPE_TERRESTRIAL = 0x03,
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};
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/**
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* dvb_frequency_list_descriptor structure.
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*/
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struct dvb_frequency_list_descriptor {
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struct descriptor d;
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EBIT2(uint8_t reserved : 6; ,
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uint8_t coding_type : 2; );
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/* uint32_t centre_frequencies [] */
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} __ucsi_packed;
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/**
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* Process a dvb_frequency_list_descriptor.
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*
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* @param d Pointer to a generic descriptor structure.
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* @return dvb_frequency_list_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_frequency_list_descriptor*
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dvb_frequency_list_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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pos += sizeof(struct dvb_frequency_list_descriptor) - 2;
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if ((len - pos) % 4)
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return NULL;
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while(pos < len) {
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bswap32(buf+pos);
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pos += 4;
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}
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return (struct dvb_frequency_list_descriptor*) d;
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}
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/**
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* Accessor for the centre_frequencies field of a dvb_frequency_list_descriptor.
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*
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* @param d dvb_frequency_list_descriptor pointer.
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* @return Pointer to the field.
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*/
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static inline uint32_t *
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dvb_frequency_list_descriptor_centre_frequencies(struct dvb_frequency_list_descriptor *d)
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{
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return (uint32_t *) ((uint8_t *) d + sizeof(struct dvb_frequency_list_descriptor));
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}
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/**
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* Determine the number of entries in the centre_frequencies field of a dvb_frequency_list_descriptor.
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*
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* @param d dvb_frequency_list_descriptor pointer.
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* @return The number of entries.
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*/
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static inline int
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dvb_frequency_list_descriptor_centre_frequencies_count(struct dvb_frequency_list_descriptor *d)
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{
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return (d->d.len - 1) >> 2;
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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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