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154 lines
5 KiB
C
154 lines
5 KiB
C
/* GStreamer tmplayer format subtitle parser
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* Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "tmplayerparse.h"
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#include <stdio.h>
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#include <string.h>
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/* From http://forum.doom9.org/archive/index.php/t-81059.html:
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*
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* TMPlayer format, which comes in five varieties:
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*
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* time-base 00:00:00:
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* 00:00:50:This is the Earth at a time|when the dinosaurs roamed...
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* 00:00:53:
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* 00:00:54:a lush and fertile planet.
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* 00:00:56:
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*
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* time-base 0:00:00:
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* 0:00:50:This is the Earth at a time|when the dinosaurs roamed...
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* 0:00:53:
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* 0:00:54:a lush and fertile planet.
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* 0:00:56:
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*
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* time-base 00:00:00=
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* 00:00:50=This is the Earth at a time|when the dinosaurs roamed...
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* 00:00:53=
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* 00:00:54=a lush and fertile planet.
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* 00:00:56=
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*
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* time-base 0:00:00=
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* 0:00:50=This is the Earth at a time|when the dinosaurs roamed...
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* 0:00:53=
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* 0:00:54=a lush and fertile planet.
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* 0:00:56=
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*
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* and multiline time-base 00:00:00,1=
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* 00:00:50,1=This is the Earth at a time
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* 00:00:50,2=when the dinosaurs roamed...
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* 00:00:53,1=
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* 00:00:54,1=a lush and fertile planet.
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* 00:00:56,1=
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*
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* --------------------------------------------------------------------------
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*
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* And another variety (which is 'time-base 0:00:00:' but without empty lines):
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*
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* 00:00:01:This is the Earth at a time|when the dinosaurs roamed...
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* 00:00:03:a lush and fertile planet.
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* 00:00:06:More text here
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* 00:00:12:Yet another line
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*
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*/
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static gchar *
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tmplayer_process_buffer (ParserState * state)
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{
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gchar *ret;
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ret = g_strndup (state->buf->str, state->buf->len);
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g_strdelimit (ret, "|", '\n');
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g_string_truncate (state->buf, 0);
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return ret;
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}
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static gchar *
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tmplayer_parse_line (ParserState * state, const gchar * line, guint line_num)
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{
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GstClockTime ts = GST_CLOCK_TIME_NONE;
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const gchar *text_start = NULL;
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gchar *ret = NULL;
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gchar divc = '\0';
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guint h, m, s, l = 1;
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if (sscanf (line, "%u:%02u:%02u,%u%c", &h, &m, &s, &l, &divc) == 5 &&
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(divc == '=')) {
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GST_LOG ("multiline format %u %u %u %u", h, m, s, l);
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ts = GST_SECOND * ((((h * 60) + m) * 60) + s);
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text_start = strchr (line, '=');
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} else if (sscanf (line, "%u:%02u:%02u%c", &h, &m, &s, &divc) == 4 &&
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(divc == '=' || divc == ':')) {
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GST_LOG ("single line format %u %u %u %u %c", h, m, s, l, divc);
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ts = GST_SECOND * ((((h * 60) + m) * 60) + s);
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text_start = strchr (line + 6, divc);
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} else if (line[0] == '\0' && state->buf->len > 0 &&
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GST_CLOCK_TIME_IS_VALID (state->start_time)) {
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/* if we get an empty line (could be the end of the file, but doesn't have
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* to be), just push whatever is still in the buffer without a duration */
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GST_LOG ("empty line, and there's still text in the buffer");
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ret = tmplayer_process_buffer (state);
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state->duration = GST_CLOCK_TIME_NONE;
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return ret;
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} else {
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GST_WARNING ("failed to parse line: '%s'", line);
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return NULL;
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}
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/* if this is a line without text, or the first line in a multiline file,
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* process and return the data in the buffer, which is the previous line(s) */
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if (text_start == NULL || text_start[1] == '\0' ||
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(l == 1 && state->buf->len > 0)) {
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if (GST_CLOCK_TIME_IS_VALID (state->start_time) &&
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state->start_time < ts && line_num > 0) {
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ret = tmplayer_process_buffer (state);
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state->duration = ts - state->start_time;
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/* ..and append current line's text (if there is any) for the next round.
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* We don't have to store ts as pending_start_time, since we deduce the
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* durations from the start times anyway, so as long as the parser just
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* forwards state->start_time by duration after it pushes the line we
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* are about to return it will all be good. */
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g_string_append (state->buf, text_start + 1);
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} else if (line_num > 0) {
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GST_WARNING ("end of subtitle unit but no valid start time?!");
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}
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} else {
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if (l > 1)
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g_string_append_c (state->buf, '\n');
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g_string_append (state->buf, text_start + 1);
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state->start_time = ts;
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}
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GST_LOG ("returning: '%s'", GST_STR_NULL (ret));
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return ret;
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}
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gchar *
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parse_tmplayer (ParserState * state, const gchar * line)
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{
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gchar *ret;
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/* GST_LOG ("Parsing: %s", line); */
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ret = tmplayer_parse_line (state, line, state->state);
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++state->state;
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return ret;
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}
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