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164 lines
4.5 KiB
164 lines
4.5 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_SERVICE_DESCRIPTOR
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#define _UCSI_DVB_SERVICE_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 service_type.
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*/
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enum {
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DVB_SERVICE_TYPE_DIGITAL_TV = 0x01,
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DVB_SERVICE_TYPE_DIGITAL_RADIO = 0x02,
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DVB_SERVICE_TYPE_TELETEXT = 0x03,
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DVB_SERVICE_TYPE_NVOD_REF = 0x04,
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DVB_SERVICE_TYPE_NVOD_TIMESHIFT = 0x05,
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DVB_SERVICE_TYPE_MOSAIC = 0x06,
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DVB_SERVICE_TYPE_PAL = 0x07,
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DVB_SERVICE_TYPE_SECAM = 0x08,
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DVB_SERVICE_TYPE_D_D2_MAC = 0x09,
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DVB_SERVICE_TYPE_FM_RADIO = 0x0a,
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DVB_SERVICE_TYPE_NTSC = 0x0b,
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DVB_SERVICE_TYPE_DATA_BCAST = 0x0c,
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DVB_SERVICE_TYPE_EN50221 = 0x0d,
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DVB_SERVICE_TYPE_RCS_MAP = 0x0e,
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DVB_SERVICE_TYPE_RCS_FLS = 0x0f,
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DVB_SERVICE_TYPE_MHP = 0x10,
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DVB_SERVICE_TYPE_MPEG2_HD_DIGITAL_TV = 0x11,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_SD_DIGITAL_TV = 0x16,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_SD_NVOD_TIMESHIFT = 0x17,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_SD_NVOD_REF = 0x18,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_HD_DIGITAL_TV = 0x19,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_HD_NVOD_TIMESHIFT = 0x1a,
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DVB_SERVICE_TYPE_ADVANCED_CODEC_HD_NVOD_REF = 0x1b,
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};
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/**
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* dvb_service_descriptor structure.
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*/
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struct dvb_service_descriptor {
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struct descriptor d;
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uint8_t service_type;
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uint8_t service_provider_name_length;
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/* uint8_t service_provider_name[] */
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/* struct dvb_service_descriptor_part2 part2 */
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} __ucsi_packed;
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/**
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* Second part of a dvb_service_descriptor following the variable length
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* service_provider_name field.
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*/
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struct dvb_service_descriptor_part2 {
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uint8_t service_name_length;
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/* uint8_t service_name[] */
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} __ucsi_packed;
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/**
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* Process a dvb_service_descriptor.
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*
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* @param d Generic descriptor pointer.
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* @return dvb_service_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_service_descriptor*
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dvb_service_descriptor_codec(struct descriptor* d)
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{
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struct dvb_service_descriptor *p =
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(struct dvb_service_descriptor *) d;
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struct dvb_service_descriptor_part2 *p2;
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uint32_t pos = sizeof(struct dvb_service_descriptor) - 2;
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uint32_t len = d->len;
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if (pos > len)
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return NULL;
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pos += p->service_provider_name_length;
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if (pos > len)
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return NULL;
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p2 = (struct dvb_service_descriptor_part2*) ((uint8_t*) d + 2 + pos);
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pos += sizeof(struct dvb_service_descriptor_part2);
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if (pos > len)
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return NULL;
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pos += p2->service_name_length;
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if (pos != len)
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return NULL;
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return p;
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}
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/**
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* Accessor for the service_provider_name field of a dvb_service_descriptor.
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*
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* @param d dvb_service_descriptor pointer.
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* @return Pointer to the service_provider_name field.
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*/
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static inline uint8_t *
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dvb_service_descriptor_service_provider_name(struct dvb_service_descriptor *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_service_descriptor);
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}
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/**
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* Accessor for the second part of a dvb_service_descriptor.
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*
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* @param d dvb_service_descriptor pointer.
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* @return dvb_service_descriptor_part2 pointer.
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*/
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static inline struct dvb_service_descriptor_part2 *
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dvb_service_descriptor_part2(struct dvb_service_descriptor *d)
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{
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return (struct dvb_service_descriptor_part2 *)
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((uint8_t*) d + sizeof(struct dvb_service_descriptor) +
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d->service_provider_name_length);
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}
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/**
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* Accessor for the service_name field of a dvb_service_descriptor_part2.
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*
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* @param d dvb_service_descriptor_part2 pointer.
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* @return Pointer to the service_name field.
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*/
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static inline uint8_t *
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dvb_service_descriptor_service_name(struct dvb_service_descriptor_part2 *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_service_descriptor_part2);
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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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