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481 lines
12 KiB
481 lines
12 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_LINKAGE_DESCRIPTOR
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#define _UCSI_DVB_LINKAGE_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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#include <libucsi/types.h>
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/**
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* Possible values for linkage_type.
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*/
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enum {
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DVB_LINKAGE_TYPE_INFORMATION = 0x01,
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DVB_LINKAGE_TYPE_EPG = 0x02,
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DVB_LINKAGE_TYPE_CA_REPLACEMENT = 0x03,
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DVB_LINKAGE_TYPE_TS_WITH_BAT_NIT = 0x04,
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DVB_LINKAGE_TYPE_SERVICE_REPLACMENT = 0x05,
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DVB_LINKAGE_TYPE_DATA_BCAST = 0x06,
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DVB_LINKAGE_TYPE_RCS_MAP = 0x07,
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DVB_LINKAGE_TYPE_MOBILE_HANDOVER = 0x08,
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DVB_LINKAGE_TYPE_SOFTWARE_UPDATE = 0x09,
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DVB_LINKAGE_TYPE_TS_WITH_SSU_BAT_NIT = 0x0a,
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DVB_LINKAGE_TYPE_IP_MAC_NOTIFICATION = 0x0b,
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DVB_LINKAGE_TYPE_TS_WITH_INT_BAT_NIT = 0x0c,
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};
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/**
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* Possible values for hand_over_type.
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*/
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enum {
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DVB_HAND_OVER_TYPE_IDENTICAL_NEIGHBOURING_COUNTRY = 0x01,
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DVB_HAND_OVER_TYPE_LOCAL_VARIATION = 0x02,
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DVB_HAND_OVER_TYPE_ASSOCIATED_SERVICE = 0x03,
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};
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/**
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* Possible values for origin_type.
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*/
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enum {
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DVB_ORIGIN_TYPE_NIT = 0x00,
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DVB_ORIGIN_TYPE_SDT = 0x01,
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};
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/**
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* dvb_linkage_descriptor structure.
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*/
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struct dvb_linkage_descriptor {
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struct descriptor d;
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uint16_t transport_stream_id;
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uint16_t original_network_id;
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uint16_t service_id;
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uint8_t linkage_type;
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/* uint8_t data[] */
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} __ucsi_packed;
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/**
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* Data for a linkage_type of 0x08.
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*/
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struct dvb_linkage_data_08 {
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EBIT3(uint8_t hand_over_type : 4; ,
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uint8_t reserved : 3; ,
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uint8_t origin_type : 1; );
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/* uint16_t network_id if hand_over_type == 1,2,3 */
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/* uint16_t initial_service_id if origin_type = 0 */
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/* uint8_t data[] */
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} __ucsi_packed;
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/**
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* Data for an linkage_type of 0x0b (IP/MAC Notification Table).
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*/
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struct dvb_linkage_data_0b {
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uint8_t platform_id_data_length;
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/* struct platform_id ids[] */
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} __ucsi_packed;
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/**
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* Entries in the ids field of a dvb_linkage_data_0b.
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*/
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struct dvb_platform_id {
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EBIT2(uint32_t platform_id : 24; ,
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uint8_t platform_name_loop_length : 8; );
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/* struct platform_name names[] */
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} __ucsi_packed;
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/**
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* Entries in the names field of a dvb_platform_id.
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*/
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struct dvb_platform_name {
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iso639lang_t language_code;
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uint8_t platform_name_length;
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/* uint8_t text[] */
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} __ucsi_packed;
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/**
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* Data for a linkage_type of 0x0c (IP/MAC Notification Table).
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*/
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struct dvb_linkage_data_0c {
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uint8_t table_type;
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/* uint16_t bouquet_id if table_type == 0x02 */
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} __ucsi_packed;
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/**
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* Process a dvb_linkage_descriptor.
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*
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* @param d Generic descriptor pointer.
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* @return dvb_linkage_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_linkage_descriptor*
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dvb_linkage_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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struct dvb_linkage_descriptor *p =
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(struct dvb_linkage_descriptor*) d;
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if (len < (sizeof(struct dvb_linkage_descriptor) - 2))
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return NULL;
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bswap16(buf);
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bswap16(buf+2);
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bswap16(buf+4);
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pos += sizeof(struct dvb_linkage_descriptor) - 2;
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if (p->linkage_type == 0x08) {
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struct dvb_linkage_data_08 *d08;
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if ((len - pos) < sizeof(struct dvb_linkage_data_08))
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return NULL;
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d08 = (struct dvb_linkage_data_08 *) (buf+pos);
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pos += sizeof(struct dvb_linkage_data_08);
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switch(d08->hand_over_type) {
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case 1:
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case 2:
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case 3:
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if ((len - pos) < 2)
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return NULL;
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bswap16(buf+pos);
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pos += 2;
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break;
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}
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if (d08->origin_type == 0) {
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if ((len - pos) < 2)
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return NULL;
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bswap16(buf+pos);
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pos+=2;
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}
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} else if (p->linkage_type == 0x0b) {
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uint32_t pos2=0;
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struct dvb_linkage_data_0b *l_0b = (struct dvb_linkage_data_0b *) (buf + pos);
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if ((len - pos) < sizeof(struct dvb_linkage_data_0b))
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return NULL;
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pos += sizeof(struct dvb_linkage_data_0b);
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if ((len - pos) < l_0b->platform_id_data_length)
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return NULL;
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while (pos2 < l_0b->platform_id_data_length) {
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bswap32(buf + pos + pos2);
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struct dvb_platform_id *p_id = (struct dvb_platform_id *) (buf + pos + pos2);
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if ((len - pos - pos2) < p_id->platform_name_loop_length)
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return NULL;
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pos2 += sizeof(struct dvb_platform_id) + p_id->platform_name_loop_length;
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}
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pos += pos2;
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} else if (p->linkage_type == 0x0c) {
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struct dvb_linkage_data_0c *l_0c = (struct dvb_linkage_data_0c *) (buf + pos);
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if ((len - pos) < sizeof(struct dvb_linkage_data_0c))
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return NULL;
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pos += sizeof(struct dvb_linkage_data_0c);
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if (l_0c->table_type == 0x02) {
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if ((len - pos) < 2)
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return NULL;
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bswap16(buf+pos);
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}
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}
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return (struct dvb_linkage_descriptor*) d;
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}
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/**
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* Accessor for the data field of a dvb_linkage_descriptor.
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*
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* @param d dvb_linkage_descriptor pointer.
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* @return Pointer to the data field.
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*/
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static inline uint8_t *
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dvb_linkage_descriptor_data(struct dvb_linkage_descriptor *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_linkage_descriptor);
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}
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/**
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* Determine the length of the data field of a dvb_linkage_descriptor.
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*
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* @param d dvb_linkage_descriptor pointer.
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* @return Length of the field in bytes.
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*/
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static inline int
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dvb_linkage_descriptor_data_length(struct dvb_linkage_descriptor *d)
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{
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return d->d.len - 7;
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}
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/**
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* Accessor for a dvb_linkage_data_08 pointer.
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*
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* @param d dvb_linkage_descriptor pointer.
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* @return Pointer to the data field.
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*/
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static inline struct dvb_linkage_data_08 *
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dvb_linkage_data_08(struct dvb_linkage_descriptor *d)
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{
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if (d->linkage_type != 0x08)
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return NULL;
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return (struct dvb_linkage_data_08 *) dvb_linkage_descriptor_data(d);
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}
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/**
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* Accessor for the network_id field of a dvb_linkage_data_08.
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*
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* @param d dvb_linkage_descriptor pointer
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* @param d08 dvb_linkage_data_08 pointer.
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* @return network_id, or -1 if not present
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*/
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static inline int
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dvb_linkage_data_08_network_id(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08)
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{
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if (d->linkage_type != 0x08)
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return -1;
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switch(d08->hand_over_type) {
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case 1:
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case 2:
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case 3:
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return *((uint16_t*) ((uint8_t*) d08 + sizeof(struct dvb_linkage_data_08)));
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}
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return -1;
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}
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/**
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* Accessor for the initial_service_id field of a dvb_linkage_data_08.
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*
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* @param d dvb_linkage_descriptor pointer
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* @param d08 dvb_linkage_data_08 pointer.
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* @return initial_service_id, or -1 if not present
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*/
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static inline int
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dvb_linkage_data_08_initial_service_id(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08)
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{
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uint8_t *pos;
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if (d->linkage_type != 0x08)
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return -1;
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if (d08->origin_type != 0)
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return -1;
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pos = ((uint8_t*) d08) + sizeof(struct dvb_linkage_data_08);
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switch(d08->hand_over_type) {
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case 1:
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case 2:
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case 3:
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pos +=2;
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break;
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}
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return *((uint16_t*) pos);
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}
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/**
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* Accessor for the data field of a dvb_linkage_data_08.
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*
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* @param d dvb_linkage_descriptor pointer
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* @param d08 dvb_linkage_data_08 pointer.
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* @param length Pointer to int destination for data length.
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* @return Pointer to the data field, or NULL if invalid
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*/
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static inline uint8_t *
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dvb_linkage_data_08_data(struct dvb_linkage_descriptor *d, struct dvb_linkage_data_08 *d08, int *length)
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{
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uint8_t *pos;
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int used = 0;
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if (d->linkage_type != 0x08) {
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*length = 0;
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return NULL;
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}
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pos = ((uint8_t*) d08) + sizeof(struct dvb_linkage_data_08);
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switch(d08->hand_over_type) {
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case 1:
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case 2:
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case 3:
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pos += 2;
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used += 2;
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break;
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}
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if (d08->origin_type == 0) {
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pos+=2;
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used+=2;
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}
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*length = dvb_linkage_descriptor_data_length(d) - (sizeof(struct dvb_linkage_data_08) + used);
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return pos;
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}
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/**
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* Accessor for a dvb_linkage_data_0b pointer.
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*
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* @param d dvb_linkage_descriptor pointer.
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* @return Pointer to the data field.
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*/
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static inline struct dvb_linkage_data_0b *
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dvb_linkage_data_0b(struct dvb_linkage_descriptor *d)
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{
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if (d->linkage_type != 0x0b)
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return NULL;
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return (struct dvb_linkage_data_0b *) dvb_linkage_descriptor_data(d);
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}
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/**
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* Iterator for the platform_id field of a dvb_linkage_data_0b.
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*
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* @param linkage dvb_linkage_data_0b pointer.
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* @param pos Variable containing a pointer to the current dvb_platform_id.
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*/
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#define dvb_linkage_data_0b_platform_id_for_each(linkage, pos) \
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for ((pos) = dvb_platform_id_first(linkage); \
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(pos); \
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(pos) = dvb_platform_id_next(linkage, pos))
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/**
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* Iterator for the platform_name field of a dvb_platform_id.
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*
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* @param platid dvb_platform_id pointer.
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* @param pos Variable containing a pointer to the current dvb_platform_name.
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*/
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#define dvb_platform_id_platform_name_for_each(platid, pos) \
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for ((pos) = dvb_platform_name_first(platid); \
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(pos); \
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(pos) = dvb_platform_name_next(platid, pos))
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/**
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* Accessor for the text field of a dvb_platform_name.
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*
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* @param p dvb_platform_name pointer.
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* @return Pointer to the field.
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*/
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static inline uint8_t *
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dvb_platform_name_text(struct dvb_platform_name *p)
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{
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return (uint8_t *) p + sizeof(struct dvb_platform_name);
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}
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/**
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* Accessor for a dvb_linkage_data_0c pointer.
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*
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* @param d dvb_linkage_descriptor pointer.
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* @return Pointer to the data field.
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*/
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static inline struct dvb_linkage_data_0c *
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dvb_linkage_data_0c(struct dvb_linkage_descriptor *d)
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{
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if (d->linkage_type != 0x0c)
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return NULL;
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return (struct dvb_linkage_data_0c *) dvb_linkage_descriptor_data(d);
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}
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/**
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* Accessor for the bouquet_id field of a dvb_linkage_data_0c if table_id == 0x02.
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*
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* @param l_0c dvb_linkage_data_0c pointer.
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* @return The bouquet field, or -1 on error.
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*/
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static inline int
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dvb_linkage_data_0c_bouquet_id(struct dvb_linkage_data_0c *l_0c)
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{
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if (l_0c->table_type != 0x02)
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return -1;
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return *((uint16_t *) ((uint8_t*) l_0c + 1));
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}
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_platform_id *
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dvb_platform_id_first(struct dvb_linkage_data_0b *d)
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{
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if (d->platform_id_data_length == 0)
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return NULL;
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return (struct dvb_platform_id *) ((uint8_t *) d + sizeof(struct dvb_linkage_data_0b));
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}
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static inline struct dvb_platform_id *
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dvb_platform_id_next(struct dvb_linkage_data_0b *d,
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struct dvb_platform_id *pos)
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{
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uint8_t *end = (uint8_t *) d + d->platform_id_data_length;
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uint8_t *next = (uint8_t *) pos +
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sizeof(struct dvb_platform_id) +
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pos->platform_name_loop_length;
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if (next >= end)
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return NULL;
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return (struct dvb_platform_id *) next;
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}
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static inline struct dvb_platform_name *
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dvb_platform_name_first(struct dvb_platform_id *p)
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{
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if (p->platform_name_loop_length == 0)
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return NULL;
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return (struct dvb_platform_name *) ((uint8_t *) p + sizeof(struct dvb_platform_id));
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}
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static inline struct dvb_platform_name *
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dvb_platform_name_next(struct dvb_platform_id *p,
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struct dvb_platform_name *pos)
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{
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uint8_t *end = (uint8_t *) p + p->platform_name_loop_length;
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uint8_t *next = (uint8_t *) pos +
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sizeof(struct dvb_platform_name) +
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pos->platform_name_length;
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if (next >= end)
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return NULL;
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return (struct dvb_platform_name *) 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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