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pmt.c
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pmt.c
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/*
* PMT table parser and generator
* Copyright (C) 2010-2011 Unix Solutions Ltd.
*
* Released under MIT license.
* See LICENSE-MIT.txt for license terms.
*/
#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include "tsfuncs.h"
struct ts_pmt *ts_pmt_alloc() {
struct ts_pmt *pmt = calloc(1, sizeof(struct ts_pmt));
pmt->section_header = ts_section_data_alloc();
pmt->streams_max = 128;
pmt->streams = calloc(pmt->streams_max, sizeof(struct ts_pmt_stream *));
return pmt;
}
static void ts_pmt_streams_data_free(struct ts_pmt *pmt) {
int i;
for (i=0;i<pmt->streams_num;i++) {
if (pmt->streams[i]) {
FREE(pmt->streams[i]->ES_info);
FREE(pmt->streams[i]);
}
}
}
void ts_pmt_clear(struct ts_pmt *pmt) {
if (!pmt)
return;
// save
struct ts_section_header *section_header = pmt->section_header;
struct ts_pmt_stream **streams = pmt->streams;
int streams_max = pmt->streams_max;
// free
FREE(pmt->program_info);
ts_pmt_streams_data_free(pmt);
// clear
ts_section_data_clear(section_header);
memset(pmt, 0, sizeof(struct ts_pmt));
// restore
pmt->section_header = section_header;
pmt->streams = streams;
pmt->streams_max = streams_max;
}
void ts_pmt_free(struct ts_pmt **ppmt) {
struct ts_pmt *pmt = *ppmt;
if (pmt) {
ts_section_data_free(&pmt->section_header);
ts_pmt_streams_data_free(pmt);
FREE(pmt->program_info);
FREE(pmt->streams);
FREE(*ppmt);
}
}
struct ts_pmt *ts_pmt_push_packet(struct ts_pmt *pmt, uint8_t *ts_packet) {
struct ts_header ts_header;
memset(&ts_header, 0, sizeof(struct ts_header));
if (ts_packet_header_parse(ts_packet, &ts_header)) {
// Received PUSI packet before table END, clear the table to start gathering new one
if (ts_header.pusi && pmt->ts_header.pusi)
ts_pmt_clear(pmt);
if (!pmt->ts_header.pusi)
pmt->ts_header = ts_header;
}
if (ts_header.pusi) {
struct ts_section_header section_header;
memset(§ion_header, 0, sizeof(struct ts_section_header));
uint8_t *section_data = ts_section_header_parse(ts_packet, &pmt->ts_header, §ion_header);
if (!section_data) {
memset(&pmt->ts_header, 0, sizeof(struct ts_header));
goto OUT;
}
// table_id should be 0x02 (program_map_section)
if (section_header.table_id != 0x02) {
memset(&pmt->ts_header, 0, sizeof(struct ts_header));
goto OUT;
}
// Set correct section_header
ts_section_header_parse(ts_packet, &pmt->ts_header, pmt->section_header);
}
if (!pmt->initialized) {
ts_section_add_packet(pmt->section_header, &ts_header, ts_packet);
if (pmt->section_header->initialized) {
if (!ts_pmt_parse(pmt))
goto ERROR;
}
}
OUT:
return pmt;
ERROR:
ts_pmt_clear(pmt);
return pmt;
}
int ts_pmt_parse(struct ts_pmt *pmt) {
uint8_t *section_data = pmt->section_header->data;
int section_len = pmt->section_header->data_len;
pmt->reserved1 = (section_data[0] &~ 0x1F) >> 5; // xxx11111
pmt->PCR_pid = ((section_data[0] &~ 0xE0) << 8) | section_data[1]; // 111xxxxx xxxxxxxx
pmt->reserved2 = (section_data[2] &~ 0x0F) >> 4; // xxxx1111
pmt->program_info_size = ((section_data[2] &~ 0xF0) << 8) | section_data[3]; // 1111xxxx xxxxxxxx
/* Handle streams */
uint8_t *stream_data = section_data + 4 + pmt->program_info_size; // +4 is to compensate for reserved1,PCR,reserved2,program_info_size
int stream_len = section_len - pmt->program_info_size - 4; // -4 for the CRC at the end
pmt->program_info = NULL;
if (pmt->program_info_size) {
pmt->program_info = malloc(pmt->program_info_size);
if (pmt->program_info) {
memcpy(pmt->program_info, stream_data - pmt->program_info_size, pmt->program_info_size);
}
}
while (stream_len > 0) {
if (pmt->streams_num == pmt->streams_max) {
ts_LOGf("PMT contains too many streams (>%d), not all are initialized!\n", pmt->streams_max);
break;
}
struct ts_pmt_stream *sinfo = calloc(1, sizeof(struct ts_pmt_stream));
sinfo->stream_type = stream_data[0];
sinfo->reserved1 = (stream_data[1] &~ 0x1F) >> 5; // xxx11111
sinfo->pid = ((stream_data[1] &~ 0xE0) << 8) | stream_data[2]; // 111xxxxx xxxxxxxx
sinfo->reserved2 = (stream_data[3] &~ 0x0F) >> 4; // xxxx1111
sinfo->ES_info_size = ((stream_data[3] &~ 0xF0) << 8) | stream_data[4]; // 1111xxxx xxxxxxxx
sinfo->ES_info = NULL;
if (sinfo->ES_info_size > 0) {
sinfo->ES_info = malloc(sinfo->ES_info_size);
memcpy(sinfo->ES_info, &stream_data[5], sinfo->ES_info_size);
}
pmt->streams[pmt->streams_num] = sinfo;
pmt->streams_num++;
stream_data += 5 + sinfo->ES_info_size;
stream_len -= 5 + sinfo->ES_info_size;
}
if (!ts_crc32_section_check(pmt->section_header, "PMT"))
return 0;
pmt->initialized = 1;
return 1;
}
void ts_pmt_generate(struct ts_pmt *pmt, uint8_t **ts_packets, int *num_packets) {
uint8_t *secdata = ts_section_data_alloc_section();
ts_section_header_generate(secdata, pmt->section_header, 0);
int curpos = 8; // Compensate for the section header, frist data byte is at offset 8
secdata[curpos + 0] = pmt->reserved1 << 5; // xxx11111
secdata[curpos + 0] |= pmt->PCR_pid >> 8; // 111xxxxx xxxxxxxx
secdata[curpos + 1] = pmt->PCR_pid &~ 0xff00;
secdata[curpos + 2] = pmt->reserved2 << 4; // xxxx1111
secdata[curpos + 2] |= pmt->program_info_size >> 8; // 1111xxxx xxxxxxxx
secdata[curpos + 3] = pmt->program_info_size &~ 0xff00;
curpos += 4; // For the fields above
if (pmt->program_info_size) {
memcpy(secdata + curpos, pmt->program_info, pmt->program_info_size);
curpos += pmt->program_info_size;
}
int i;
for(i=0;i<pmt->streams_num;i++) {
struct ts_pmt_stream *stream = pmt->streams[i];
secdata[curpos + 0] = stream->stream_type;
secdata[curpos + 1] = stream->reserved1 << 5; // xxx11111
secdata[curpos + 1] |= stream->pid >> 8; // 111xxxxx xxxxxxxx
secdata[curpos + 2] = stream->pid &~ 0xff00;
secdata[curpos + 3] = stream->reserved2 << 4; // xxxx1111
secdata[curpos + 3] |= stream->ES_info_size >> 8; // 1111xxxx xxxxxxxx
secdata[curpos + 4] = stream->ES_info_size &~ 0xff00;
curpos += 5; // Compensate for the above
if (stream->ES_info_size > 0) {
memcpy(secdata + curpos, stream->ES_info, stream->ES_info_size);
curpos += stream->ES_info_size;
}
}
pmt->section_header->CRC = ts_section_data_calculate_crc(secdata, curpos);
curpos += 4; // CRC
ts_section_data_gen_ts_packets(&pmt->ts_header, secdata, curpos, pmt->section_header->pointer_field, ts_packets, num_packets);
FREE(secdata);
}
void ts_pmt_regenerate_packets(struct ts_pmt *pmt) {
uint8_t *ts_packets;
int num_packets;
ts_pmt_generate(pmt, &ts_packets, &num_packets);
FREE(pmt->section_header->packet_data);
pmt->section_header->packet_data = ts_packets;
pmt->section_header->num_packets = num_packets;
}
struct ts_pmt *ts_pmt_copy(struct ts_pmt *pmt) {
struct ts_pmt *newpmt = ts_pmt_alloc();
int i;
for (i=0;i<pmt->section_header->num_packets; i++) {
newpmt = ts_pmt_push_packet(newpmt, pmt->section_header->packet_data + (i * TS_PACKET_SIZE));
}
if (newpmt->initialized) {
return newpmt;
} else {
ts_LOGf("Error copying PMT!\n");
ts_pmt_free(&newpmt);
return NULL;
}
}
void ts_pmt_check_generator(struct ts_pmt *pmt) {
struct ts_pmt *pmt1 = ts_pmt_copy(pmt);
if (pmt1) {
ts_compare_data("PMT (tspacket->struct)",
pmt1->section_header->packet_data,
pmt->section_header->packet_data,
pmt->section_header->num_packets * TS_PACKET_SIZE);
ts_pmt_free(&pmt1);
}
uint8_t *ts_packets;
int num_packets;
ts_pmt_generate(pmt, &ts_packets, &num_packets);
if (num_packets != pmt->section_header->num_packets) {
ts_LOGf("ERROR: num_packets:%d != sec->num_packets:%d\n", num_packets, pmt->section_header->num_packets);
}
ts_compare_data("PMT (struct->tspacket)", pmt->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
free(ts_packets);
}
void ts_pmt_dump(struct ts_pmt *pmt) {
struct ts_section_header *sec = pmt->section_header;
int i;
ts_section_dump(sec);
ts_LOGf(" * PMT data\n");
ts_LOGf(" * PID : %04x (%d)\n", pmt->ts_header.pid, pmt->ts_header.pid);
ts_LOGf(" * reserved1 : %d\n", pmt->reserved1);
ts_LOGf(" * PCR PID : %04x (%d)\n", pmt->PCR_pid, pmt->PCR_pid);
ts_LOGf(" * reserved2 : %d\n", pmt->reserved2);
ts_LOGf(" * program_len : %d\n", pmt->program_info_size);
ts_LOGf(" * num_streams : %d\n", pmt->streams_num);
if (pmt->program_info_size > 0) {
ts_LOGf(" * Program info:\n");
ts_LOGf(" * program info size: %d\n", pmt->program_info_size);
ts_descriptor_dump(pmt->program_info, pmt->program_info_size);
}
for(i=0;i<pmt->streams_num;i++) {
struct ts_pmt_stream *stream = pmt->streams[i];
ts_LOGf(" * [%02d/%02d] PID %04x (%d) -> Stream type: 0x%02x (%d) /es_info_size: %d/ %s\n",
i+1, pmt->streams_num,
stream->pid, stream->pid,
stream->stream_type, stream->stream_type,
stream->ES_info_size,
h222_stream_type_desc(stream->stream_type)
);
if (stream->ES_info) {
ts_descriptor_dump(stream->ES_info, stream->ES_info_size);
}
}
ts_pmt_check_generator(pmt);
}
int ts_pmt_is_same(struct ts_pmt *pmt1, struct ts_pmt *pmt2) {
if (pmt1 == pmt2) return 1; // Same
if (pmt1 && pmt2)
return ts_section_is_same(pmt1->section_header, pmt2->section_header);
else
return 0;
}