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187 lines
4.4 KiB
187 lines
4.4 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_VBI_DATA_DESCRIPTOR
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#define _UCSI_DVB_VBI_DATA_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 the data_service_id field.
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*/
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enum {
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DVB_VBI_DATA_SERVICE_ID_EBU = 0x01,
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DVB_VBI_DATA_SERVICE_ID_INVERTED = 0x02,
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DVB_VBI_DATA_SERVICE_ID_VPS = 0x04,
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DVB_VBI_DATA_SERVICE_ID_WSS = 0x05,
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DVB_VBI_DATA_SERVICE_ID_CC = 0x06,
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DVB_VBI_DATA_SERVICE_ID_MONO_422 = 0x07,
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};
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/**
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* dvb_vbi_data_descriptor structure
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*/
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struct dvb_vbi_data_descriptor {
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struct descriptor d;
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/* struct dvb_vbi_data_entry entries[] */
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} __ucsi_packed;
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/**
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* An entry in the dvb_vbi_data_descriptor entries field.
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*/
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struct dvb_vbi_data_entry {
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uint8_t data_service_id;
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uint8_t data_length;
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/* uint8_t data[] */
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} __ucsi_packed;
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/**
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* Format of the dvb_vbi_data_entry data field, if data_service_id == 1,2,4,5,6,7.
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*/
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struct dvb_vbi_data_x {
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EBIT3(uint8_t reserved : 2; ,
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uint8_t field_parity : 1; ,
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uint8_t line_offset : 5; );
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} __ucsi_packed;
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/**
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* Process a dvb_vbi_data_descriptor.
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*
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* @param d Generic descriptor structure.
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* @return dvb_vbi_data_descriptor pointer, or NULL on error.
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*/
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static inline struct dvb_vbi_data_descriptor*
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dvb_vbi_data_descriptor_codec(struct descriptor* d)
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{
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uint8_t* p = (uint8_t*) d + 2;
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uint32_t pos = 0;
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uint32_t len = d->len;
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while(pos < len) {
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struct dvb_vbi_data_entry *e =
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(struct dvb_vbi_data_entry*) (p+pos);
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pos += sizeof(struct dvb_vbi_data_entry);
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if (pos > len)
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return NULL;
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pos += e->data_length;
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if (pos > len)
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return NULL;
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}
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return (struct dvb_vbi_data_descriptor*) d;
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}
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/**
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* Iterator for entries field in a dvb_vbi_data_descriptor structure.
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*
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* @param d Pointer to dvb_vbi_data_descriptor structure.
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* @param pos Variable holding pointer to the current dvb_vbi_data_entry structure.
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*/
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#define dvb_vbi_data_descriptor_entries_for_each(d, pos) \
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for ((pos) = dvb_vbi_data_descriptor_entries_first(d); \
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(pos); \
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(pos) = dvb_vbi_data_descriptor_entries_next(d, pos))
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/**
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* Get a pointer to the data field of a dvb_vbi_data_entry.
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*
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* @param d dvb_vbi_data_entry structure.
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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_vbi_data_entry_data(struct dvb_vbi_data_entry *d)
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{
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return (uint8_t *) d + sizeof(struct dvb_vbi_data_entry);
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}
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/**
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* Get a pointer to the data field of a dvb_vbi_data_x for id 1,2,4,5,6,7.
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*
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* @param d dvb_vbi_data_entry structure.
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* @return Pointer to the data field, or NULL if invalid
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*/
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static inline struct dvb_vbi_data_x*
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dvb_vbi_data_entry_data_x(struct dvb_vbi_data_entry *d)
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{
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switch(d->data_service_id) {
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case 1:
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case 2:
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case 4:
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case 5:
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case 6:
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case 7:
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return (struct dvb_vbi_data_x*) ((uint8_t *) d + sizeof(struct dvb_vbi_data_entry));
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}
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return NULL;
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}
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/******************************** PRIVATE CODE ********************************/
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static inline struct dvb_vbi_data_entry*
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dvb_vbi_data_descriptor_entries_first(struct dvb_vbi_data_descriptor *d)
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{
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if (d->d.len == 0)
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return NULL;
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return (struct dvb_vbi_data_entry *)
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((uint8_t*) d + sizeof(struct dvb_vbi_data_descriptor));
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}
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static inline struct dvb_vbi_data_entry*
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dvb_vbi_data_descriptor_entries_next(struct dvb_vbi_data_descriptor *d,
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struct dvb_vbi_data_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_vbi_data_entry) +
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pos->data_length;
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if (next >= end)
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return NULL;
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return (struct dvb_vbi_data_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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