You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
168 lines
5.0 KiB
168 lines
5.0 KiB
/*****************************************************************************
|
|
* pat.h: ISO/IEC 13818-1 Program Allocation Table (PAT)
|
|
*****************************************************************************
|
|
* Copyright (C) 2009-2010 VideoLAN
|
|
*
|
|
* Authors: Christophe Massiot <massiot@via.ecp.fr>
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject
|
|
* to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Normative references:
|
|
* - ISO/IEC 13818-1:2007(E) (MPEG-2 Systems)
|
|
*/
|
|
|
|
#ifndef __BITSTREAM_MPEG_PAT_H__
|
|
#define __BITSTREAM_MPEG_PAT_H__
|
|
|
|
#include <bitstream/common.h>
|
|
#include <bitstream/mpeg/psi/psi.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
/*****************************************************************************
|
|
* Program Association Table
|
|
*****************************************************************************/
|
|
#define PAT_PID 0x0
|
|
#define PAT_TABLE_ID 0x0
|
|
#define PAT_HEADER_SIZE PSI_HEADER_SIZE_SYNTAX1
|
|
#define PAT_PROGRAM_SIZE 4
|
|
|
|
#define pat_set_tsid psi_set_tableidext
|
|
#define pat_get_tsid psi_get_tableidext
|
|
|
|
static inline void pat_init(uint8_t *p_pat)
|
|
{
|
|
psi_init(p_pat, true);
|
|
psi_set_tableid(p_pat, PAT_TABLE_ID);
|
|
p_pat[1] &= ~0x40;
|
|
}
|
|
|
|
static inline void pat_set_length(uint8_t *p_pat, uint16_t i_pat_length)
|
|
{
|
|
psi_set_length(p_pat, PAT_HEADER_SIZE + PSI_CRC_SIZE - PSI_HEADER_SIZE
|
|
+ i_pat_length);
|
|
}
|
|
|
|
static inline void patn_init(uint8_t *p_pat_n)
|
|
{
|
|
p_pat_n[2] = 0xe0;
|
|
}
|
|
|
|
static inline void patn_set_program(uint8_t *p_pat_n, uint16_t i_program)
|
|
{
|
|
p_pat_n[0] = i_program >> 8;
|
|
p_pat_n[1] = i_program & 0xff;
|
|
}
|
|
|
|
static inline uint16_t patn_get_program(const uint8_t *p_pat_n)
|
|
{
|
|
return (p_pat_n[0] << 8) | p_pat_n[1];
|
|
}
|
|
|
|
static inline void patn_set_pid(uint8_t *p_pat_n, uint16_t i_pid)
|
|
{
|
|
p_pat_n[2] &= ~0x1f;
|
|
p_pat_n[2] |= i_pid >> 8;
|
|
p_pat_n[3] = i_pid & 0xff;
|
|
}
|
|
|
|
static inline uint16_t patn_get_pid(const uint8_t *p_pat_n)
|
|
{
|
|
return ((p_pat_n[2] & 0x1f) << 8) | p_pat_n[3];
|
|
}
|
|
|
|
static inline uint8_t *pat_get_program(uint8_t *p_pat, uint8_t n)
|
|
{
|
|
uint8_t *p_pat_n = p_pat + PAT_HEADER_SIZE + n * PAT_PROGRAM_SIZE;
|
|
if (p_pat_n + PAT_PROGRAM_SIZE - p_pat
|
|
> psi_get_length(p_pat) + PSI_HEADER_SIZE - PSI_CRC_SIZE)
|
|
return NULL;
|
|
return p_pat_n;
|
|
}
|
|
|
|
static inline bool pat_validate(const uint8_t *p_pat)
|
|
{
|
|
if (!psi_get_syntax(p_pat) || psi_get_tableid(p_pat) != PAT_TABLE_ID)
|
|
return false;
|
|
if ((psi_get_length(p_pat) - PAT_HEADER_SIZE + PSI_HEADER_SIZE
|
|
- PSI_CRC_SIZE) % PAT_PROGRAM_SIZE)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline uint8_t *pat_table_find_program(uint8_t **pp_sections,
|
|
uint16_t i_program)
|
|
{
|
|
uint8_t i_last_section = psi_table_get_lastsection(pp_sections);
|
|
uint8_t i;
|
|
|
|
for (i = 0; i <= i_last_section; i++) {
|
|
uint8_t *p_section = psi_table_get_section(pp_sections, i);
|
|
uint8_t *p_program;
|
|
int j = 0;
|
|
|
|
while ((p_program = pat_get_program(p_section, j)) != NULL) {
|
|
j++;
|
|
if (patn_get_program(p_program) == i_program)
|
|
return p_program;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool pat_table_validate(uint8_t **pp_sections)
|
|
{
|
|
uint8_t i_last_section = psi_table_get_lastsection(pp_sections);
|
|
uint8_t i;
|
|
|
|
for (i = 0; i <= i_last_section; i++) {
|
|
uint8_t *p_section = psi_table_get_section(pp_sections, i);
|
|
uint8_t *p_program;
|
|
int j = 0;
|
|
|
|
if (!psi_check_crc(p_section))
|
|
return false;
|
|
|
|
while ((p_program = pat_get_program(p_section, j)) != NULL) {
|
|
uint8_t *p_program2 = pat_table_find_program(pp_sections,
|
|
patn_get_program(p_program));
|
|
j++;
|
|
/* check that the program number is not already in the table
|
|
* with another PID */
|
|
if (patn_get_pid(p_program) != patn_get_pid(p_program2))
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|