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mpegts_section.c
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mpegts_section.c
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <memory.h>
#include "mpegts.h"
#include "pidmap.h"
#include "crc.h"
int read_pat_section(TSTEST* ctx, PACKET* pctx, struct mpegts_section_header* sec_header);
int read_pmt_section(TSTEST* ctx, PACKET* pctx, struct mpegts_section_header* sec_header);
int read_section(TSTEST* ctx, PACKET* pctx)
{
struct mpegts_section_header sec_header;
BITS* b = pctx->b;
uint8_t* body;
uint8_t* body_end;
body = bits_getptr(b);
sec_header.table_id = bits_get(b, 8);
sec_header.section_syntax_indicator = bits_getbit(b);
sec_header.zero = bits_getbit(b);
sec_header.b2_reserved = bits_get(b, 2);
sec_header.section_length = bits_get(b, 12);
print_section_header(&sec_header);
switch(sec_header.table_id)
{
case TABLE_ID_PAT:
// PAT
read_pat_section(ctx, pctx, &sec_header);
break;
case TABLE_ID_PMT:
// PMT
read_pmt_section(ctx, pctx, &sec_header);
break;
}
body_end = bits_getptr(b);
uint32_t crc_read, crc;
crc = crc32(body, body_end - body);
crc_read = bits_get(b, 32);
printf("CRC: %s (%08x/%08x)\n",
(crc == crc_read) ? "[OK]" : "[NG]", crc_read, crc);
return 0;
}
void print_section_header(struct mpegts_section_header* sec_header)
{
printf("SH: ID:%02x SSI:%d, Z:%d, size:%d\n",
sec_header->table_id,
sec_header->section_syntax_indicator,
sec_header->zero,
sec_header->section_length);
}
int read_pat_section(TSTEST* ctx, PACKET* pctx, struct mpegts_section_header* sec_header)
{
BITS* b = pctx->b;
struct mpegts_program_association_section_header pat_header;
pat_header.transport_stream_id = bits_get(b, 16);
pat_header.reserved = bits_get(b, 2);
pat_header.version_number = bits_get(b, 5);
pat_header.current_next_indicator = bits_getbit(b);
pat_header.section_number = bits_get(b, 8);
pat_header.last_section_number = bits_get(b, 8);
int i, table_size = sec_header->section_length - 5 - 4;
pat_header.count = table_size / 4;
for(i = 0; i < pat_header.count; i++)
{
struct mpegts_program_association_section_entry e;
e.program_number = bits_get(b, 16);
e.reserved = bits_get(b, 3);
e.program_map_PID = bits_get(b, 13);
pidmap_register(ctx, e.program_map_PID, read_section);
printf("PAT: PROG:%04x => PMT:%04x\n",
e.program_number, e.program_map_PID);
}
return 0;
}
int read_pmt_section(TSTEST* ctx, PACKET* pctx, struct mpegts_section_header* sec_header)
{
BITS* b = pctx->b;
struct mpegts_program_map_section_header pmt_header;
int i, j;
pmt_header.program_number = bits_get(b, 16);
pmt_header.reserved1 = bits_get(b, 2);
pmt_header.version_number = bits_get(b, 5);
pmt_header.current_next_indicator = bits_getbit(b);
pmt_header.section_number = bits_get(b, 8);
pmt_header.last_section_number = bits_get(b, 8);
pmt_header.reserved2 = bits_get(b, 3);
pmt_header.PCR_PID = bits_get(b, 13);
pmt_header.reserved3 = bits_get(b, 4);
pmt_header.program_info_length = bits_get(b, 12);
for(i = 0; i < pmt_header.program_info_length; i++)
{
// 捨てる
bits_get(b, 8);
}
int table_size = sec_header->section_length - 9 - pmt_header.program_info_length - 4;
for(i = 0; i < table_size; )
{
struct mpegts_program_map_section_entry e;
e.stream_type = bits_get(b, 8);
e.reserved1 = bits_get(b, 3);
e.elementary_PID = bits_get(b, 13);
e.reserved2 = bits_get(b, 4);
e.ES_info_length = bits_get(b, 12);
for(j = 0; j < e.ES_info_length; j++)
{
bits_get(b, 8);
}
printf("PMT: STR:%02x => PID:%04x\n", e.stream_type, e.elementary_PID);
i += 5 + e.ES_info_length;
}
return 0;
}