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273 lines
8.5 KiB
273 lines
8.5 KiB
/*****************************************************************************
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* desc_4e.h: ETSI EN 300 468 Descriptor 0x4e: Extended event descriptor
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*****************************************************************************
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* Copyright (C) 2011 Unix Solutions Ltd.
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*
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* Authors: Georgi Chorbadzhiyski <georgi@unixsol.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* Normative references:
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* - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
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*/
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#ifndef __BITSTREAM_DVB_DESC_4E_H__
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#define __BITSTREAM_DVB_DESC_4E_H__
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#include <bitstream/common.h>
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#include <bitstream/mpeg/psi/descriptors.h>
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#include <bitstream/dvb/si/strings.h>
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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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/*****************************************************************************
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* Descriptor 0x4e: Extended event descriptor
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*****************************************************************************/
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#define DESC4E_HEADER_SIZE (DESC_HEADER_SIZE + 4)
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static inline void desc4e_init(uint8_t *p_desc)
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{
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desc_set_tag(p_desc, 0x4e);
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}
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static inline uint8_t desc4e_get_desc_number(uint8_t *p_desc)
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{
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return p_desc[2] >> 4;
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}
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static inline void desc4e_set_desc_number(uint8_t *p_desc, uint8_t i_desc_number)
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{
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p_desc[2] = (i_desc_number << 4) | (p_desc[2] & 0x0f);
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}
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static inline uint8_t desc4e_get_last_desc_number(uint8_t *p_desc)
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{
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return p_desc[2] & 0x0f;
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}
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static inline void desc4e_set_last_desc_number(uint8_t *p_desc, uint8_t i_last_desc_number)
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{
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p_desc[2] = (p_desc[2] & 0xf0) | (i_last_desc_number & 0x0f);
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}
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static inline const uint8_t *desc4e_get_lang(const uint8_t *p_desc)
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{
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return p_desc + 3;
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}
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static inline void desc4e_set_lang(uint8_t *p_desc_n, const uint8_t p_code[3])
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{
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p_desc_n[3] = p_code[0];
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p_desc_n[4] = p_code[1];
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p_desc_n[5] = p_code[2];
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}
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static inline uint8_t desc4e_get_items_length(const uint8_t *p_desc)
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{
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return p_desc[6];
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}
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static inline void desc4e_set_items_length(uint8_t *p_desc, uint8_t i_length)
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{
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p_desc[6] = i_length;
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}
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static inline uint8_t *desc4e_get_item(uint8_t *p_desc, uint8_t n)
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{
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uint8_t *p = p_desc + DESC4E_HEADER_SIZE;
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uint8_t *p_item, *p_items, *p_items_end;
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uint8_t i_items_len = *p;
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if (!i_items_len)
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return NULL;
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p_items = p_item = p + 1;
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p_items_end = p_items + i_items_len;
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if (n == 0)
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return p_item;
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while ( p_item < p_items_end ) {
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p_item += 1 + p_item[0]; /* Skip item description */
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p_item += 1 + p_item[0]; /* Skip item text */
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if ( --n == 0 && p_item < p_items_end )
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return p_item;
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}
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return NULL;
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}
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static inline const uint8_t *desc4en_get_item_description(const uint8_t *p_desc_n, uint8_t *i_length)
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{
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*i_length = p_desc_n[0];
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return p_desc_n + 1;
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}
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static inline void desc4en_set_item_description(uint8_t *p_desc_n, uint8_t *item_description, uint8_t i_length)
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{
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p_desc_n[0] = i_length;
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memcpy(p_desc_n + 1, item_description, i_length);
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}
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static inline const uint8_t *desc4en_get_item_text(const uint8_t *p_desc_n, uint8_t *i_length)
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{
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const uint8_t *p_ret = p_desc_n + 1 + p_desc_n[0];
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*i_length = p_ret[0];
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return p_ret + 1;
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}
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static inline void desc4en_set_item_text(uint8_t *p_desc_n, uint8_t *item_text, uint8_t i_length)
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{
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uint8_t *p = p_desc_n + 1 + p_desc_n[0];
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p[0] = i_length;
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memcpy(p + 1, item_text, i_length);
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}
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static inline uint8_t *desc4e_get_text(uint8_t *p_desc, uint8_t *i_length)
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{
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uint8_t *p = p_desc + DESC4E_HEADER_SIZE + 1 + desc4e_get_items_length(p_desc);
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*i_length = p[0];
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return p + 1;
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}
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static inline void desc4e_set_text(uint8_t *p_desc, uint8_t *p_text, uint8_t i_length)
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{
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uint8_t *p = p_desc + DESC4E_HEADER_SIZE + 1 + desc4e_get_items_length(p_desc);
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p[0] = i_length;
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memcpy(p + 1, p_text, i_length);
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}
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static inline void desc4e_set_length(uint8_t *p_desc)
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{
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uint8_t i_text_len;
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desc4e_get_text(p_desc, &i_text_len);
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desc_set_length(p_desc, (DESC4E_HEADER_SIZE - DESC_HEADER_SIZE)
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+ 1 + desc4e_get_items_length(p_desc)
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+ 1 + i_text_len);
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}
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static inline bool desc4e_validate(const uint8_t *p_desc)
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{
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uint8_t i_length = desc_get_length(p_desc);
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int i_items_len;
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const uint8_t *p = p_desc + DESC4E_HEADER_SIZE;
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const uint8_t *p_items, *p_items_end, *p_item;
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if (DESC4E_HEADER_SIZE + 2 > i_length + DESC_HEADER_SIZE)
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return false;
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i_items_len = *p;
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p_items = p_item = p + 1;
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p_items_end = p_items + i_items_len;
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p += 1 + p[0]; /* Check item loop */
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if (p + 1 - p_desc > i_length + DESC_HEADER_SIZE)
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return false;
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p += 1 + p[0]; /* Check text */
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if (p - p_desc > i_length + DESC_HEADER_SIZE)
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return false;
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while ( p_item < p_items_end ) {
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p_item += 1 + p_item[0]; /* Check item description */
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if ( p_item > p_items_end )
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return false;
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p_item += 1 + p_item[0]; /* Check item text */
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if ( p_item > p_items_end )
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return false;
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}
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return true;
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}
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static inline void desc4e_print(uint8_t *p_desc,
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f_print pf_print, void *print_opaque,
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f_iconv pf_iconv, void *iconv_opaque,
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print_type_t i_print_type)
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{
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uint8_t i_text_length;
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uint8_t *p_text = desc4e_get_text(p_desc, &i_text_length);
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char *psz_text = dvb_string_get(p_text, i_text_length,
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pf_iconv, iconv_opaque);
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switch (i_print_type) {
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case PRINT_XML:
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psz_text = dvb_string_xml_escape(psz_text);
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pf_print(print_opaque,
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"<EXTENDED_EVENT_DESC desc_number=\"%u\" last_desc_number=\"%u\""
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" lang=\"%3.3s\" text=\"%s\">",
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desc4e_get_desc_number(p_desc),
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desc4e_get_last_desc_number(p_desc),
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(char *)desc4e_get_lang(p_desc),
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psz_text
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);
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break;
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default:
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pf_print(print_opaque,
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" - desc 4e extended_event desc_number=%u"
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" last_desc_number=%u lang=%3.3s text=\"%s\"",
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desc4e_get_desc_number(p_desc),
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desc4e_get_last_desc_number(p_desc),
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(char *)desc4e_get_lang(p_desc),
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psz_text
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);
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}
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free( psz_text );
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uint8_t j = 0;
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const uint8_t *p_desc_n;
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while ((p_desc_n = desc4e_get_item(p_desc, j++)) != NULL) {
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uint8_t i_desc_length, i_item_length;
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const uint8_t *p_desc = desc4en_get_item_description(p_desc_n, &i_desc_length);
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const uint8_t *p_item = desc4en_get_item_text(p_desc_n, &i_item_length);
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char *psz_desc = dvb_string_get(p_desc, i_desc_length, pf_iconv, iconv_opaque);
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char *psz_item = dvb_string_get(p_item, i_item_length, pf_iconv, iconv_opaque);
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switch (i_print_type) {
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case PRINT_XML:
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psz_desc = dvb_string_xml_escape(psz_desc);
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psz_item = dvb_string_xml_escape(psz_item);
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pf_print(print_opaque, "<EXTENDED_EVENT_ITEM description=\"%s\" text=\"%s\"/>",
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psz_desc, psz_item);
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break;
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default:
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pf_print(print_opaque," - extended_event_item description=\"%s\" text=\"%s\"",
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psz_desc, psz_item);
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}
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free(psz_desc);
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free(psz_item);
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}
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if (i_print_type == PRINT_XML)
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pf_print(print_opaque, "</EXTENDED_EVENT_DESC>");
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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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