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/* mp2t.c
*
* ISO/IEC 13818-1 MPEG2-TS file format decoder for the Wiretap library.
* Written by Weston Schmidt <weston_schmidt@alumni.purdue.edu>
* Copyright 2012 Weston Schmidt
*
* $Id$
*
* Wiretap Library
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "mp2t.h"
#include "wtap-int.h"
#include "buffer.h"
#include "file_wrappers.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define MP2T_SYNC_BYTE 0x47
#define MP2T_SIZE 188
#define MP2T_QAM256_BITRATE 38810700 /* bits per second */
#define MP2T_QAM64_BITRATE 26970350 /* bits per second */
typedef struct {
guint32 offset;
struct wtap_nstime now;
} mp2t_filetype_t;
static gboolean
mp2t_read_data(guint8 *dest, int length, int *err, gchar **err_info, FILE_T fh)
{
int bytes_read;
bytes_read = file_read(dest, length, fh);
if (MP2T_SIZE != bytes_read) {
*err = file_error(fh, err_info);
if (*err == 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
return TRUE;
}
static gboolean
mp2t_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
{
mp2t_filetype_t *mp2t;
guint64 tmp;
mp2t = (mp2t_filetype_t*) wth->priv;
*data_offset = mp2t->offset;
buffer_assure_space(wth->frame_buffer, MP2T_SIZE);
if (FALSE == mp2t_read_data(buffer_start_ptr(wth->frame_buffer),
MP2T_SIZE, err, err_info, wth->fh))
{
return FALSE;
}
mp2t->offset += MP2T_SIZE;
/* XXX - relative, not absolute, time stamps */
wth->phdr.presence_flags = WTAP_HAS_TS;
/* It would be really cool to be able to configure the bitrate... */
tmp = MP2T_SIZE * 8;
tmp *= 1000000000;
tmp /= MP2T_QAM256_BITRATE;
wth->phdr.ts.secs = mp2t->now.secs;
wth->phdr.ts.nsecs = mp2t->now.nsecs;
mp2t->now.nsecs += (guint32)tmp;
if (1000000000 <= mp2t->now.nsecs) {
mp2t->now.nsecs -= 1000000000;
mp2t->now.secs++;
}
wth->phdr.caplen = MP2T_SIZE;
wth->phdr.len = MP2T_SIZE;
return TRUE;
}
static gboolean
mp2t_seek_read(wtap *wth, gint64 seek_off,
union wtap_pseudo_header *pseudo_header _U_, guint8 *pd, int length,
int *err, gchar **err_info)
{
if (-1 == file_seek(wth->random_fh, seek_off, SEEK_SET, err)) {
return FALSE;
}
return mp2t_read_data(pd, length, err, err_info, wth->random_fh);
}
int
mp2t_open(wtap *wth, int *err, gchar **err_info)
{
int bytes_read;
guint8 buffer[MP2T_SIZE];
int i;
int first;
mp2t_filetype_t *mp2t;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(buffer, sizeof(buffer), wth->fh);
if (sizeof(buffer) != bytes_read) {
*err = file_error(wth->fh, err_info);
return (*err == 0) ? 0 : -1;
}
first = -1;
for (i = 0; i < MP2T_SIZE; i++) {
if (MP2T_SYNC_BYTE == buffer[i]) {
first = i;
break;
}
}
if (-1 == first) {
return 0;
}
if (-1 == file_seek(wth->fh, first, SEEK_SET, err)) {
return -1;
}
wth->file_type = WTAP_FILE_MPEG_2_TS;
wth->file_encap = WTAP_ENCAP_MPEG_2_TS;
wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
wth->subtype_read = mp2t_read;
wth->subtype_seek_read = mp2t_seek_read;
wth->snapshot_length = 0;
mp2t = (mp2t_filetype_t*) g_malloc(sizeof(mp2t_filetype_t));
if (NULL == mp2t) {
return -1;
}
wth->priv = mp2t;
mp2t->offset = (guint32) first;
mp2t->now.secs = 0;
mp2t->now.nsecs = 0;
return 1;
}
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