gstreamer/gst/subparse/tmplayerparse.c
Tim-Philipp Müller 005c1c8636 gst/subparse/: Fix parsing of tmplayer subtitle variant where every single line contains text and there isn't an empt...
Original commit message from CVS:
* gst/subparse/gstsubparse.c: (handle_buffer),
(gst_sub_parse_sink_event):
* gst/subparse/tmplayerparse.c: (tmplayer_process_buffer),
(tmplayer_parse_line):
Fix parsing of tmplayer subtitle variant where every single line contains
text and there isn't an empty line after each line to determine the
duration (). Improve EOS handling for tmplayer subtitles a bit by
making sure that we push out the last line of text without a duration if
there's still text left in the buffer at the end.
2008-05-03 15:45:23 +00:00

155 lines
5 KiB
C

/* GStreamer tmplayer format subtitle parser
* Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "tmplayerparse.h"
#include <string.h>
/* From http://forum.doom9.org/archive/index.php/t-81059.html:
*
* TMPlayer format, which comes in five varieties:
*
* time-base 00:00:00:
* 00:00:50:This is the Earth at a time|when the dinosaurs roamed...
* 00:00:53:
* 00:00:54:a lush and fertile planet.
* 00:00:56:
*
* time-base 0:00:00:
* 0:00:50:This is the Earth at a time|when the dinosaurs roamed...
* 0:00:53:
* 0:00:54:a lush and fertile planet.
* 0:00:56:
*
* time-base 00:00:00=
* 00:00:50=This is the Earth at a time|when the dinosaurs roamed...
* 00:00:53=
* 00:00:54=a lush and fertile planet.
* 00:00:56=
*
* time-base 0:00:00=
* 0:00:50=This is the Earth at a time|when the dinosaurs roamed...
* 0:00:53=
* 0:00:54=a lush and fertile planet.
* 0:00:56=
*
* and multiline time-base 00:00:00,1=
* 00:00:50,1=This is the Earth at a time
* 00:00:50,2=when the dinosaurs roamed...
* 00:00:53,1=
* 00:00:54,1=a lush and fertile planet.
* 00:00:56,1=
*
* --------------------------------------------------------------------------
*
* And another variety (which is 'time-base 0:00:00:' but without empty lines):
*
* 00:00:01:This is the Earth at a time|when the dinosaurs roamed...
* 00:00:03:a lush and fertile planet.
* 00:00:06:More text here
* 00:00:12:Yet another line
*
*/
static gchar *
tmplayer_process_buffer (ParserState * state)
{
gchar *ret;
ret = g_strndup (state->buf->str, state->buf->len);
g_strdelimit (ret, "|", '\n');
g_string_truncate (state->buf, 0);
return ret;
}
static gchar *
tmplayer_parse_line (ParserState * state, const gchar * line, guint line_num)
{
GstClockTime ts = GST_CLOCK_TIME_NONE;
const gchar *text_start = NULL;
gboolean multiline = FALSE;
gchar *ret = NULL;
gchar divc = '\0';
guint h, m, s, l = 1;
if (sscanf (line, "%u:%02u:%02u,%u%c", &h, &m, &s, &l, &divc) == 5 &&
(divc == '=')) {
GST_LOG ("multiline format %u %u %u %u", h, m, s, l);
ts = GST_SECOND * ((((h * 60) + m) * 60) + s);
text_start = strchr (line, '=');
multiline = TRUE;
} else if (sscanf (line, "%u:%02u:%02u%c", &h, &m, &s, &divc) == 4 &&
(divc == '=' || divc == ':')) {
GST_LOG ("single line format %u %u %u %u %c", h, m, s, l, divc);
ts = GST_SECOND * ((((h * 60) + m) * 60) + s);
text_start = strchr (line + 6, divc);
} else if (line[0] == '\0' && state->buf->len > 0 &&
GST_CLOCK_TIME_IS_VALID (state->start_time)) {
/* if we get an empty line (could be the end of the file, but doesn't have
* to be), just push whatever is still in the buffer without a duration */
GST_LOG ("empty line, and there's still text in the buffer");
ret = tmplayer_process_buffer (state);
state->duration = GST_CLOCK_TIME_NONE;
return ret;
} else {
GST_WARNING ("failed to parse line: '%s'", line);
return NULL;
}
/* if this is a line without text, or the first line in a multiline file,
* process and return the data in the buffer, which is the previous line(s) */
if (text_start == NULL || text_start[1] == '\0' ||
(l == 1 && state->buf->len > 0)) {
if (GST_CLOCK_TIME_IS_VALID (state->start_time) &&
state->start_time < ts && line_num > 0) {
ret = tmplayer_process_buffer (state);
state->duration = ts - state->start_time;
/* ..and append current line's text (if there is any) for the next round.
* We don't have to store ts as pending_start_time, since we deduce the
* durations from the start times anyway, so as long as the parser just
* forwards state->start_time by duration after it pushes the line we
* are about to return it will all be good. */
g_string_append (state->buf, text_start + 1);
} else if (line_num > 0) {
GST_WARNING ("end of subtitle unit but no valid start time?!");
}
} else {
if (l > 1)
g_string_append_c (state->buf, '\n');
g_string_append (state->buf, text_start + 1);
state->start_time = ts;
}
GST_LOG ("returning: '%s'", GST_STR_NULL (ret));
return ret;
}
gchar *
parse_tmplayer (ParserState * state, const gchar * line)
{
gchar *ret;
/* GST_LOG ("Parsing: %s", line); */
ret = tmplayer_parse_line (state, line, state->state);
++state->state;
return ret;
}