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- Committer: Package Import Robot
- Author(s): Alessio Treglia
- Date: 2012-04-04 09:42:43 UTC
- Revision ID: package-import@ubuntu.com-20120404094243-qsc40h18oolnxw5r
Tags: upstream-7.0
Import upstream version 7.0
- files added:
- libfuncs
- libtsfuncs
added
removed
libtsfuncs/eit.c
1
/*
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* EIT table parser and generator
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* Copyright (C) 2010-2011 Unix Solutions Ltd.
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*
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* Released under MIT license.
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* See LICENSE-MIT.txt for license terms.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tsfuncs.h"
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struct ts_eit *ts_eit_alloc() {
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struct ts_eit *eit = calloc(1, sizeof(struct ts_eit));
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eit->section_header = ts_section_data_alloc();
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eit->streams_max = 128;
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eit->streams = calloc(eit->streams_max, sizeof(void *));
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return eit;
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}
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static void ts_eit_streams_data_free(struct ts_eit *eit) {
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int i;
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for (i=0;i<eit->streams_num;i++) {
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if (eit->streams[i]) {
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FREE(eit->streams[i]->descriptor_data);
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FREE(eit->streams[i]);
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}
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}
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}
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void ts_eit_clear(struct ts_eit *eit) {
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if (!eit)
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return;
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// save
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struct ts_section_header *section_header = eit->section_header;
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struct ts_eit_stream **streams = eit->streams;
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int streams_max = eit->streams_max;
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// free
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ts_eit_streams_data_free(eit);
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// clear
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ts_section_data_clear(section_header);
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memset(eit, 0, sizeof(struct ts_eit));
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// restore
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eit->section_header = section_header;
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eit->streams = streams;
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eit->streams_max = streams_max;
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}
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void ts_eit_free(struct ts_eit **peit) {
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struct ts_eit *eit = *peit;
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if (eit) {
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ts_section_data_free(&eit->section_header);
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ts_eit_streams_data_free(eit);
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FREE(eit->streams);
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FREE(*peit);
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}
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}
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struct ts_eit *ts_eit_push_packet(struct ts_eit *eit, uint8_t *ts_packet) {
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struct ts_header ts_header;
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memset(&ts_header, 0, sizeof(struct ts_header));
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if (ts_packet_header_parse(ts_packet, &ts_header)) {
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// EIT should be with PID 0x12
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if (ts_header.pid != 0x12)
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goto OUT;
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// Received PUSI packet before table END, clear the table to start gathering new one
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if (ts_header.pusi && eit->ts_header.pusi)
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ts_eit_clear(eit);
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if (!eit->ts_header.pusi)
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eit->ts_header = ts_header;
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}
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if (ts_header.pusi) {
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struct ts_section_header section_header;
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memset(§ion_header, 0, sizeof(struct ts_section_header));
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uint8_t *section_data = ts_section_header_parse(ts_packet, &eit->ts_header, §ion_header);
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if (!section_data) {
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memset(&eit->ts_header, 0, sizeof(struct ts_header));
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goto OUT;
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}
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// table_id should be 0x4e (event_information_section - actual_transport_stream, present/following)
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// table_id 0x50 - 0x5f (event_information_section - actual_transport_stream, schedule)
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if (section_header.table_id != 0x4e && (section_header.table_id < 0x50 && section_header.table_id > 0x5f)) {
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memset(&eit->ts_header, 0, sizeof(struct ts_header));
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goto OUT;
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}
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// Set correct section_header
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ts_section_header_parse(ts_packet, &eit->ts_header, eit->section_header);
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}
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if (!eit->initialized) {
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ts_section_add_packet(eit->section_header, &ts_header, ts_packet);
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if (eit->section_header->initialized) {
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if (!ts_eit_parse(eit))
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goto ERROR;
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}
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}
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OUT:
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return eit;
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ERROR:
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ts_eit_clear(eit);
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return eit;
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}
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int ts_eit_parse(struct ts_eit *eit) {
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uint8_t *section_data = eit->section_header->data;
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int section_len = eit->section_header->data_len;
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/* Table data (6 bytes) */
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eit->transport_stream_id = (section_data[0] << 8) | section_data[1]; // 11111111 11111111
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eit->original_network_id = (section_data[2] << 8) | section_data[3]; // 11111111 11111111
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eit->segment_last_section_number = section_data[4];
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eit->last_table_id = section_data[5];
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uint8_t *stream_data = section_data + 6; // +5 is to compensate for the above
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int stream_len = section_len - 6 - 4; // -4 for the CRC at the end
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while (stream_len > 0) {
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if (eit->streams_num == eit->streams_max) {
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ts_LOGf("!!! Too many streams in EIT, max %d\n", eit->streams_max);
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break;
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}
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struct ts_eit_stream *sinfo = calloc(1, sizeof(struct ts_eit_stream));
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sinfo->event_id = (stream_data[0] << 8) | stream_data[1];
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sinfo->start_time_mjd = (stream_data[2] << 8) | stream_data[3];
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sinfo->start_time_bcd = stream_data[4] << 16;
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sinfo->start_time_bcd |= stream_data[5] << 8;
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sinfo->start_time_bcd |= stream_data[6];
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sinfo->duration_bcd = stream_data[7] << 16;
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sinfo->duration_bcd |= stream_data[8] << 8;
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sinfo->duration_bcd |= stream_data[9];
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sinfo->running_status = stream_data[10] >> 5; // 111xxxxx
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sinfo->free_CA_mode = (stream_data[10] &~ 0xE0) >> 4; // xxx1xxxx
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sinfo->descriptor_size = ((stream_data[10] &~ 0xF0) << 8) | stream_data[11]; // 1111xxxx xxxxxxxx
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stream_data += 12; // Compensate for the the above vars
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stream_len -= 12 + sinfo->descriptor_size;
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sinfo->descriptor_data = NULL;
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if (sinfo->descriptor_size > 0) {
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sinfo->descriptor_data = malloc(sinfo->descriptor_size);
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memcpy(sinfo->descriptor_data, stream_data, sinfo->descriptor_size);
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}
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eit->streams[eit->streams_num] = sinfo;
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eit->streams_num++;
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stream_data += sinfo->descriptor_size;
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}
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if (!ts_crc32_section_check(eit->section_header, "EIT"))
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return 0;
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eit->initialized = 1;
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return 1;
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}
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void ts_eit_generate(struct ts_eit *eit, uint8_t **ts_packets, int *num_packets) {
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uint8_t *secdata = ts_section_data_alloc_section();
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ts_section_header_generate(secdata, eit->section_header, 0);
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int curpos = 8; // Compensate for the section header, frist data byte is at offset 8
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secdata[curpos + 0] = eit->transport_stream_id >> 8; // xxxxxxxx xxxxxxxx
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secdata[curpos + 1] = eit->transport_stream_id &~ 0xff00;
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secdata[curpos + 2] = eit->original_network_id >> 8; // xxxxxxxx xxxxxxxx
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secdata[curpos + 3] = eit->original_network_id &~ 0xff00;
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secdata[curpos + 4] = eit->segment_last_section_number;
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secdata[curpos + 5] = eit->last_table_id;
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curpos += 6; // For the fields above
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int i;
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for(i=0;i<eit->streams_num;i++) {
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struct ts_eit_stream *stream = eit->streams[i];
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secdata[curpos + 0] = stream->event_id >> 8; // xxxxxxxx xxxxxxxx
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secdata[curpos + 1] = stream->event_id &~ 0xff00;
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secdata[curpos + 2] = stream->start_time_mjd >> 8; // xxxxxxxx xxxxxxxx
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secdata[curpos + 3] = stream->start_time_mjd &~ 0xff00;
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secdata[curpos + 4] = stream->start_time_bcd >> 16;
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secdata[curpos + 5] =(stream->start_time_bcd >> 8) &~ 0xff00;
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secdata[curpos + 6] = stream->start_time_bcd &~ 0xffff00;
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secdata[curpos + 7] = stream->duration_bcd >> 16;
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secdata[curpos + 8] =(stream->duration_bcd >> 8) &~ 0xff00;
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secdata[curpos + 9] = stream->duration_bcd &~ 0xffff00;
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secdata[curpos +10] = stream->running_status << 5; // 111xxxxx
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secdata[curpos +10] |= stream->free_CA_mode << 4; // xxx1xxxx
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secdata[curpos +10] |= stream->descriptor_size >> 8; // 1111xxxx xxxxxxxx
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secdata[curpos +11] = stream->descriptor_size &~ 0xff00;
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curpos += 12; // Compensate for the above
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if (stream->descriptor_size > 0) {
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memcpy(secdata + curpos, stream->descriptor_data, stream->descriptor_size);
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curpos += stream->descriptor_size;
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}
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}
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eit->section_header->CRC = ts_section_data_calculate_crc(secdata, curpos);
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curpos += 4; // CRC
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ts_section_data_gen_ts_packets(&eit->ts_header, secdata, curpos, eit->section_header->pointer_field, ts_packets, num_packets);
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FREE(secdata);
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}
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void ts_eit_check_generator(struct ts_eit *eit) {
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struct ts_eit *eit1 = ts_eit_alloc();
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int i;
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for (i=0;i<eit->section_header->num_packets;i++) {
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eit1 = ts_eit_push_packet(eit1, eit->section_header->packet_data + (i * TS_PACKET_SIZE));
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}
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ts_compare_data("EIT (tspacket->struct)",
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eit1->section_header->packet_data,
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eit->section_header->packet_data,
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eit->section_header->num_packets * TS_PACKET_SIZE);
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ts_eit_free(&eit1);
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uint8_t *ts_packets;
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int num_packets;
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ts_eit_generate(eit, &ts_packets, &num_packets);
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if (num_packets != eit->section_header->num_packets) {
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ts_LOGf("ERROR: num_packets:%d != sec->num_packets:%d\n", num_packets, eit->section_header->num_packets);
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}
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ts_compare_data("EIT (struct->tspacket)", eit->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
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free(ts_packets);
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}
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void ts_eit_regenerate_packets(struct ts_eit *eit) {
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uint8_t *ts_packets;
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int num_packets;
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ts_eit_generate(eit, &ts_packets, &num_packets);
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FREE(eit->section_header->packet_data);
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eit->section_header->packet_data = ts_packets;
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eit->section_header->num_packets = num_packets;
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}
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struct ts_eit *ts_eit_copy(struct ts_eit *eit) {
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struct ts_eit *neweit = ts_eit_alloc();
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int i;
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for (i=0;i<eit->section_header->num_packets; i++) {
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neweit = ts_eit_push_packet(neweit, eit->section_header->packet_data + (i * TS_PACKET_SIZE));
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}
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if (neweit->initialized) {
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return neweit;
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} else {
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ts_LOGf("Error copying EIT!\n");
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ts_eit_free(&neweit);
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return NULL;
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}
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}
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void ts_eit_dump(struct ts_eit *eit) {
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struct ts_section_header *sect = eit->section_header;
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int i;
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ts_section_dump(sect);
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ts_LOGf(" * EIT data\n");
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ts_LOGf(" * PID : 0x%04x (%d)\n", eit->ts_header.pid, eit->ts_header.pid);
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ts_LOGf(" * ts_stream_id : 0x%04x (%d)\n", eit->transport_stream_id, eit->transport_stream_id);
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ts_LOGf(" * org_network_id : 0x%04x (%d)\n", eit->original_network_id, eit->original_network_id);
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ts_LOGf(" * seg_last_sec_num: %d\n", eit->segment_last_section_number);
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ts_LOGf(" * last_table_id : 0x%02x (%d)\n", eit->last_table_id, eit->last_table_id);
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ts_LOGf(" * num_streams : %d\n", eit->streams_num);
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for(i=0;i<eit->streams_num;i++) {
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struct ts_eit_stream *stream = eit->streams[i];
285
int hour, min, sec;
286
struct tm tm;
287
ts_time_decode_mjd(stream->start_time_mjd, stream->start_time_bcd, &tm);
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ts_time_decode_bcd(stream->duration_bcd, NULL, &hour, &min, &sec);
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ts_LOGf(" * Event_id [%02d/%02d]\n", i+1, eit->streams_num);
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ts_LOGf(" - Event_id : 0x%04x (%d)\n", stream->event_id, stream->event_id);
291
ts_LOGf(" - Start_time: %04d-%02d-%02d %02d:%02d:%02d (0x%04x%06x) ts: %ld\n",
292
tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec,
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stream->start_time_mjd,
294
stream->start_time_bcd, timegm(&tm));
295
ts_LOGf(" - Duration : %02d:%02d:%02d (0x%06x)\n",
296
hour, min, sec,
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stream->duration_bcd);
298
ts_LOGf(" - Running_status: %d free_CA_mode: %d /desc_size: %d/\n",
299
stream->running_status,
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stream->free_CA_mode,
301
stream->descriptor_size);
302
303
if (stream->descriptor_data) {
304
ts_descriptor_dump(stream->descriptor_data, stream->descriptor_size);
305
}
306
}
307
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ts_eit_check_generator(eit);
309
}
310
311
int ts_eit_is_same(struct ts_eit *eit1, struct ts_eit *eit2) {
312
if (eit1 == eit2) return 1; // Same
313
if ((!eit1 && eit2) || (eit1 && !eit2)) return 0; // Not same (one is NULL)
314
return ts_section_is_same(eit1->section_header, eit2->section_header);
315
}
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