gstreamer/gst/subparse/mpl2parse.c

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/* GStreamer mpl2 format subtitle parser
* Copyright (C) 2006 Kamil Pawlowski <kamilpe gmail com>
*
* 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 "mpl2parse.h"
#include <string.h>
/* From http://lists.mplayerhq.hu/pipermail/mplayer-users/2003-February/030222.html
*
* [123][456] Sample subtitle
* [1234][5678] Line 1|Line 2
* [12345][67890] /Italic|Normal
* [12345][67890] /Italic|/Italic
* [12345][67890] Normal|/Italic
*
* (The space between the last ']' bracket and the text appears to be optional)
*/
static gchar *
mpl2_parse_line (ParserState * state, const gchar * line, guint line_num)
{
GString *markup;
gint dc_start, dc_stop;
/* parse subtitle file line */
if (sscanf (line, "[%u][%u]", &dc_start, &dc_stop) != 2) {
GST_WARNING ("failed to extract timestamps for line '%s'", line);
return NULL;
}
GST_LOG ("line format %u %u", dc_start, dc_stop);
state->start_time = GST_SECOND / 10 * dc_start;
state->duration = (GST_SECOND / 10 * dc_stop) - state->start_time;
/* skip brackets with timestamps */
line = strchr (line, ']') + 1;
line = strchr (line, ']') + 1;
markup = g_string_new (NULL);
while (1) {
const gchar *format_string;
const gchar *sep;
gchar *line_chunk_escaped;
/* skip leading white spaces */
while (*line == ' ' || *line == '\t')
++line;
/* a '/' at the beginning indicates italics */
if (*line == '/') {
format_string = "<i>%s</i>";
++line;
} else {
format_string = "%s";
}
if ((sep = strchr (line, '|')))
line_chunk_escaped = g_markup_escape_text (line, sep - line);
else
line_chunk_escaped = g_markup_escape_text (line, -1);
GST_LOG ("escaped line: %s", line_chunk_escaped);
g_string_append_printf (markup, format_string, line_chunk_escaped);
g_free (line_chunk_escaped);
if (sep == NULL)
break;
/* move after the '|' and append another line */
g_string_append (markup, "\n");
line = sep + 1;
}
return g_strstrip (g_string_free (markup, FALSE));
}
gchar *
parse_mpl2 (ParserState * state, const gchar * line)
{
gchar *ret;
ret = mpl2_parse_line (state, line, state->state);
++state->state;
return ret;
}