/* GStreamer * Copyright (C) <1999> Erik Walthinsen * Copyright (C) 2004 Ronald S. Bultje * Copyright (C) 2006 Tim-Philipp Müller * * 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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "gstsubparse.h" #include "gstssaparse.h" #include "samiparse.h" #include "tmplayerparse.h" #include "mpl2parse.h" GST_DEBUG_CATEGORY (sub_parse_debug); #define DEFAULT_ENCODING NULL enum { PROP_0, PROP_ENCODING }; static void gst_sub_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_sub_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static const GstElementDetails sub_parse_details = GST_ELEMENT_DETAILS ("Subtitle parser", "Codec/Parser/Subtitle", "Parses subtitle (.sub) files into text streams", "Gustavo J. A. M. Carneiro \n" "Ronald S. Bultje "); #ifndef GST_DISABLE_XML static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-subtitle; application/x-subtitle-sami; " "application/x-subtitle-tmplayer; application/x-subtitle-mpl2") ); #else static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-subtitle") ); #endif static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("text/plain; text/x-pango-markup") ); static void gst_sub_parse_base_init (GstSubParseClass * klass); static void gst_sub_parse_class_init (GstSubParseClass * klass); static void gst_sub_parse_init (GstSubParse * subparse); static gboolean gst_sub_parse_src_event (GstPad * pad, GstEvent * event); static gboolean gst_sub_parse_sink_event (GstPad * pad, GstEvent * event); static GstStateChangeReturn gst_sub_parse_change_state (GstElement * element, GstStateChange transition); static GstFlowReturn gst_sub_parse_chain (GstPad * sinkpad, GstBuffer * buf); static GstElementClass *parent_class = NULL; GType gst_sub_parse_get_type (void) { static GType sub_parse_type = 0; if (!sub_parse_type) { static const GTypeInfo sub_parse_info = { sizeof (GstSubParseClass), (GBaseInitFunc) gst_sub_parse_base_init, NULL, (GClassInitFunc) gst_sub_parse_class_init, NULL, NULL, sizeof (GstSubParse), 0, (GInstanceInitFunc) gst_sub_parse_init, }; sub_parse_type = g_type_register_static (GST_TYPE_ELEMENT, "GstSubParse", &sub_parse_info, 0); } return sub_parse_type; } static void gst_sub_parse_base_init (GstSubParseClass * klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_templ)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_templ)); gst_element_class_set_details (element_class, &sub_parse_details); } static void gst_sub_parse_dispose (GObject * object) { GstSubParse *subparse = GST_SUBPARSE (object); GST_DEBUG_OBJECT (subparse, "cleaning up subtitle parser"); if (subparse->encoding) { g_free (subparse->encoding); subparse->encoding = NULL; } if (subparse->textbuf) { g_string_free (subparse->textbuf, TRUE); subparse->textbuf = NULL; } #ifndef GST_DISABLE_XML sami_context_deinit (&subparse->state); #endif GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object)); } static void gst_sub_parse_class_init (GstSubParseClass * klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GstElementClass *element_class = GST_ELEMENT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); object_class->dispose = gst_sub_parse_dispose; object_class->set_property = gst_sub_parse_set_property; object_class->get_property = gst_sub_parse_get_property; element_class->change_state = gst_sub_parse_change_state; g_object_class_install_property (object_class, PROP_ENCODING, g_param_spec_string ("subtitle-encoding", "subtitle charset encoding", "Encoding to assume if input subtitles are not in UTF-8 encoding. " "If not set, the GST_SUBTITLE_ENCODING environment variable will " "be checked for an encoding to use. If that is not set either, " "ISO-8859-15 will be assumed.", DEFAULT_ENCODING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void gst_sub_parse_init (GstSubParse * subparse) { subparse->sinkpad = gst_pad_new_from_static_template (&sink_templ, "sink"); gst_pad_set_chain_function (subparse->sinkpad, GST_DEBUG_FUNCPTR (gst_sub_parse_chain)); gst_pad_set_event_function (subparse->sinkpad, GST_DEBUG_FUNCPTR (gst_sub_parse_sink_event)); gst_element_add_pad (GST_ELEMENT (subparse), subparse->sinkpad); subparse->srcpad = gst_pad_new_from_static_template (&src_templ, "src"); gst_pad_set_event_function (subparse->srcpad, GST_DEBUG_FUNCPTR (gst_sub_parse_src_event)); gst_element_add_pad (GST_ELEMENT (subparse), subparse->srcpad); subparse->textbuf = g_string_new (NULL); subparse->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; subparse->flushing = FALSE; gst_segment_init (&subparse->segment, GST_FORMAT_TIME); subparse->need_segment = TRUE; subparse->encoding = g_strdup (DEFAULT_ENCODING); } /* * Source pad functions. */ static gboolean gst_sub_parse_src_event (GstPad * pad, GstEvent * event) { GstSubParse *self = GST_SUBPARSE (gst_pad_get_parent (pad)); gboolean ret = FALSE; GST_DEBUG ("Handling %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { GstFormat format; GstSeekType start_type, stop_type; gint64 start, stop; gdouble rate; gboolean update; gst_event_parse_seek (event, &rate, &format, &self->segment_flags, &start_type, &start, &stop_type, &stop); if (format != GST_FORMAT_TIME) { GST_WARNING_OBJECT (self, "we only support seeking in TIME format"); gst_event_unref (event); goto beach; } /* Convert that seek to a seeking in bytes at position 0, FIXME: could use an index */ ret = gst_pad_push_event (self->sinkpad, gst_event_new_seek (rate, GST_FORMAT_BYTES, self->segment_flags, GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_NONE, 0)); if (ret) { /* Apply the seek to our segment */ gst_segment_set_seek (&self->segment, rate, format, self->segment_flags, start_type, start, stop_type, stop, &update); GST_DEBUG_OBJECT (self, "segment after seek: %" GST_SEGMENT_FORMAT, &self->segment); self->next_offset = 0; self->need_segment = TRUE; } else { GST_WARNING_OBJECT (self, "seek to 0 bytes failed"); } gst_event_unref (event); break; } default: ret = gst_pad_event_default (pad, event); break; } beach: gst_object_unref (self); return ret; } static void gst_sub_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSubParse *subparse = GST_SUBPARSE (object); GST_OBJECT_LOCK (subparse); switch (prop_id) { case PROP_ENCODING: g_free (subparse->encoding); subparse->encoding = g_value_dup_string (value); GST_LOG_OBJECT (object, "subtitle encoding set to %s", GST_STR_NULL (subparse->encoding)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (subparse); } static void gst_sub_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstSubParse *subparse = GST_SUBPARSE (object); GST_OBJECT_LOCK (subparse); switch (prop_id) { case PROP_ENCODING: g_value_set_string (value, subparse->encoding); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (subparse); } static gchar * convert_encoding (GstSubParse * self, const gchar * str, gsize len) { const gchar *encoding; GError *err = NULL; gchar *ret; if (self->valid_utf8) { if (g_utf8_validate (str, len, NULL)) { GST_LOG_OBJECT (self, "valid UTF-8, no conversion needed"); return g_strndup (str, len); } GST_INFO_OBJECT (self, "invalid UTF-8!"); self->valid_utf8 = FALSE; } encoding = self->encoding; if (encoding == NULL || *encoding == '\0') { encoding = g_getenv ("GST_SUBTITLE_ENCODING"); } if (encoding == NULL || *encoding == '\0') { /* if local encoding is UTF-8 and no encoding specified * via the environment variable, assume ISO-8859-15 */ if (g_get_charset (&encoding)) { encoding = "ISO-8859-15"; } } ret = g_convert_with_fallback (str, len, "UTF-8", encoding, "*", NULL, NULL, &err); if (err) { GST_WARNING_OBJECT (self, "could not convert string from '%s' to UTF-8: %s", encoding, err->message); g_error_free (err); /* invalid input encoding, fall back to ISO-8859-15 (always succeeds) */ ret = g_convert_with_fallback (str, len, "UTF-8", "ISO-8859-15", "*", NULL, NULL, NULL); } GST_LOG_OBJECT (self, "successfully converted %" G_GSIZE_FORMAT " characters from %s to UTF-8" "%s", len, encoding, (err) ? " , using ISO-8859-15 as fallback" : ""); return ret; } static gchar * get_next_line (GstSubParse * self) { char *line = NULL; const char *line_end; int line_len; gboolean have_r = FALSE; line_end = strchr (self->textbuf->str, '\n'); if (!line_end) { /* end-of-line not found; return for more data */ return NULL; } /* get rid of '\r' */ if (line_end != self->textbuf->str && *(line_end - 1) == '\r') { line_end--; have_r = TRUE; } line_len = line_end - self->textbuf->str; line = convert_encoding (self, self->textbuf->str, line_len); self->textbuf = g_string_erase (self->textbuf, 0, line_len + (have_r ? 2 : 1)); return line; } static gchar * parse_mdvdsub (ParserState * state, const gchar * line) { const gchar *line_split; gchar *line_chunk; guint start_frame, end_frame; gint64 clip_start = 0, clip_stop = 0; gboolean in_seg = FALSE; GString *markup; gchar *ret; /* style variables */ gboolean italic; gboolean bold; guint fontsize; if (sscanf (line, "{%u}{%u}", &start_frame, &end_frame) != 2) { g_warning ("Parse of the following line, assumed to be in microdvd .sub" " format, failed:\n%s", line); return NULL; } /* skip the {%u}{%u} part */ line = strchr (line, '}') + 1; line = strchr (line, '}') + 1; /* see if there's a first line with a framerate */ if (state->fps == 0.0 && start_frame == 1 && end_frame == 1) { gchar *rest, *end = NULL; rest = g_strdup (line); g_strdelimit (rest, ",", '.'); state->fps = g_ascii_strtod (rest, &end); if (end == rest) state->fps = 0.0; GST_INFO ("framerate from file: %f ('%s')", state->fps, rest); g_free (rest); return NULL; } if (state->fps == 0.0) { /* FIXME: hardcoded for now, is there a better way/assumption? */ state->fps = 24000.0 / 1001.0; GST_INFO ("no framerate specified, assuming %f", state->fps); } state->start_time = start_frame / state->fps * GST_SECOND; state->duration = (end_frame - start_frame) / state->fps * GST_SECOND; /* Check our segment start/stop */ in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME, state->start_time, state->start_time + state->duration, &clip_start, &clip_stop); /* No need to parse that text if it's out of segment */ if (in_seg) { state->start_time = clip_start; state->duration = clip_stop - clip_start; } else { return NULL; } markup = g_string_new (NULL); while (1) { italic = FALSE; bold = FALSE; fontsize = 0; /* parse style markup */ if (strncmp (line, "{y:i}", 5) == 0) { italic = TRUE; line = strchr (line, '}') + 1; } if (strncmp (line, "{y:b}", 5) == 0) { bold = TRUE; line = strchr (line, '}') + 1; } if (sscanf (line, "{s:%u}", &fontsize) == 1) { line = strchr (line, '}') + 1; } /* forward slashes at beginning/end signify italics too */ if (g_str_has_prefix (line, "/")) { italic = TRUE; ++line; } if ((line_split = strchr (line, '|'))) line_chunk = g_markup_escape_text (line, line_split - line); else line_chunk = g_markup_escape_text (line, strlen (line)); /* Remove italics markers at end of line/stanza (CHECKME: are end slashes * always at the end of a line or can they span multiple lines?) */ if (g_str_has_suffix (line_chunk, "/")) { line_chunk[strlen (line_chunk) - 1] = '\0'; } markup = g_string_append (markup, "%s", line_chunk); g_free (line_chunk); if (line_split) { g_string_append (markup, "\n"); line = line_split + 1; } else { break; } } ret = markup->str; g_string_free (markup, FALSE); GST_DEBUG ("parse_mdvdsub returning (%f+%f): %s", state->start_time / (double) GST_SECOND, state->duration / (double) GST_SECOND, ret); return ret; } static void strip_trailing_newlines (gchar * txt) { if (txt) { guint len; len = strlen (txt); while (len > 1 && txt[len - 1] == '\n') { txt[len - 1] = '\0'; --len; } } } /* we want to escape text in general, but retain basic markup like * , , and . The easiest and safest way is to * just unescape a white list of allowed markups again after * escaping everything (the text between these simple markers isn't * necessarily escaped, so it seems best to do it like this) */ static void subrip_unescape_formatting (gchar * txt) { gchar *pos; for (pos = txt; pos != NULL && *pos != '\0'; ++pos) { if (g_ascii_strncasecmp (pos, "<u>", 9) == 0 || g_ascii_strncasecmp (pos, "<i>", 9) == 0 || g_ascii_strncasecmp (pos, "<b>", 9) == 0) { pos[0] = '<'; pos[1] = g_ascii_tolower (pos[4]); pos[2] = '>'; /* move NUL terminator as well */ g_memmove (pos + 3, pos + 9, strlen (pos + 9) + 1); pos += 2; } } for (pos = txt; pos != NULL && *pos != '\0'; ++pos) { if (g_ascii_strncasecmp (pos, "</u>", 10) == 0 || g_ascii_strncasecmp (pos, "</i>", 10) == 0 || g_ascii_strncasecmp (pos, "</b>", 10) == 0) { pos[0] = '<'; pos[1] = '/'; pos[2] = g_ascii_tolower (pos[5]); pos[3] = '>'; /* move NUL terminator as well */ g_memmove (pos + 4, pos + 10, strlen (pos + 10) + 1); pos += 3; } } } static gboolean subrip_remove_unhandled_tag (gchar * start, gchar * stop) { gchar *tag, saved; tag = start + strlen ("<"); if (*tag == '/') ++tag; if (g_ascii_tolower (*tag) < 'a' || g_ascii_tolower (*tag) > 'z') return FALSE; saved = *stop; *stop = '\0'; GST_LOG ("removing unhandled tag '%s'", start); *stop = saved; g_memmove (start, stop, strlen (stop) + 1); return TRUE; } /* remove tags we haven't explicitly allowed earlier on, like font tags * for example */ static void subrip_remove_unhandled_tags (gchar * txt) { gchar *pos, *gt; for (pos = txt; pos != NULL && *pos != '\0'; ++pos) { if (strncmp (pos, "<", 4) == 0 && (gt = strstr (pos + 4, ">"))) { if (subrip_remove_unhandled_tag (pos, gt + strlen (">"))) --pos; } } } /* we only allow , and , so let's take a simple approach. This code * assumes the input has been escaped and subrip_unescape_formatting() has then * been run over the input! This function adds missing closing markup tags and * removes broken closing tags for tags that have never been opened. */ static void subrip_fix_up_markup (gchar ** p_txt) { gchar *cur, *next_tag; gchar open_tags[32]; guint num_open_tags = 0; g_assert (*p_txt != NULL); cur = *p_txt; while (*cur != '\0') { next_tag = strchr (cur, '<'); if (next_tag == NULL) break; ++next_tag; switch (*next_tag) { case '/':{ ++next_tag; if (num_open_tags == 0 || open_tags[num_open_tags - 1] != *next_tag) { GST_LOG ("broken input, closing tag '%c' is not open", *next_tag); g_memmove (next_tag - 2, next_tag + 2, strlen (next_tag + 2) + 1); next_tag -= 2; } else { /* it's all good, closing tag which is open */ --num_open_tags; } break; } case 'i': case 'b': case 'u': if (num_open_tags == G_N_ELEMENTS (open_tags)) return; /* something dodgy is going on, stop parsing */ open_tags[num_open_tags] = *next_tag; ++num_open_tags; break; default: GST_ERROR ("unexpected tag '%c' (%s)", *next_tag, next_tag); g_assert_not_reached (); break; } cur = next_tag; } if (num_open_tags > 0) { GString *s; s = g_string_new (*p_txt); while (num_open_tags > 0) { GST_LOG ("adding missing closing tag '%c'", open_tags[num_open_tags - 1]); g_string_append_c (s, '<'); g_string_append_c (s, '/'); g_string_append_c (s, open_tags[num_open_tags - 1]); g_string_append_c (s, '>'); --num_open_tags; } g_free (*p_txt); *p_txt = g_string_free (s, FALSE); } } static gchar * parse_subrip (ParserState * state, const gchar * line) { guint h1, m1, s1, ms1; guint h2, m2, s2, ms2; int subnum; gchar *ret; switch (state->state) { case 0: /* looking for a single integer */ if (sscanf (line, "%u", &subnum) == 1) state->state = 1; return NULL; case 1: /* looking for start_time --> end_time */ if (sscanf (line, "%u:%u:%u,%u --> %u:%u:%u,%u", &h1, &m1, &s1, &ms1, &h2, &m2, &s2, &ms2) == 8) { state->state = 2; state->start_time = (((guint64) h1) * 3600 + m1 * 60 + s1) * GST_SECOND + ms1 * GST_MSECOND; state->duration = (((guint64) h2) * 3600 + m2 * 60 + s2) * GST_SECOND + ms2 * GST_MSECOND - state->start_time; } else { GST_DEBUG ("error parsing subrip time line"); state->state = 0; } return NULL; case 2: { /* No need to parse that text if it's out of segment */ gint64 clip_start = 0, clip_stop = 0; gboolean in_seg = FALSE; /* Check our segment start/stop */ in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME, state->start_time, state->start_time + state->duration, &clip_start, &clip_stop); if (in_seg) { state->start_time = clip_start; state->duration = clip_stop - clip_start; } else { state->state = 0; return NULL; } } /* looking for subtitle text; empty line ends this subtitle entry */ if (state->buf->len) g_string_append_c (state->buf, '\n'); g_string_append (state->buf, line); if (strlen (line) == 0) { ret = g_markup_escape_text (state->buf->str, state->buf->len); g_string_truncate (state->buf, 0); state->state = 0; subrip_unescape_formatting (ret); subrip_remove_unhandled_tags (ret); strip_trailing_newlines (ret); subrip_fix_up_markup (&ret); return ret; } return NULL; default: g_return_val_if_reached (NULL); } } static void subviewer_unescape_newlines (gchar * read) { gchar *write = read; /* Replace all occurences of '[br]' with a newline as version 2 * of the subviewer format uses this for newlines */ if (read[0] == '\0' || read[1] == '\0' || read[2] == '\0' || read[3] == '\0') return; do { if (strncmp (read, "[br]", 4) == 0) { *write = '\n'; read += 4; } else { *write = *read; read++; } write++; } while (*read); *write = '\0'; } static gchar * parse_subviewer (ParserState * state, const gchar * line) { guint h1, m1, s1, ms1; guint h2, m2, s2, ms2; gchar *ret; /* TODO: Maybe also parse the fields in the header, especially DELAY. * For examples see the unit test or * http://www.doom9.org/index.html?/sub.htm */ switch (state->state) { case 0: /* looking for start_time,end_time */ if (sscanf (line, "%u:%u:%u.%u,%u:%u:%u.%u", &h1, &m1, &s1, &ms1, &h2, &m2, &s2, &ms2) == 8) { state->state = 1; state->start_time = (((guint64) h1) * 3600 + m1 * 60 + s1) * GST_SECOND + ms1 * GST_MSECOND; state->duration = (((guint64) h2) * 3600 + m2 * 60 + s2) * GST_SECOND + ms2 * GST_MSECOND - state->start_time; } return NULL; case 1: { /* No need to parse that text if it's out of segment */ gint64 clip_start = 0, clip_stop = 0; gboolean in_seg = FALSE; /* Check our segment start/stop */ in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME, state->start_time, state->start_time + state->duration, &clip_start, &clip_stop); if (in_seg) { state->start_time = clip_start; state->duration = clip_stop - clip_start; } else { state->state = 0; return NULL; } } /* looking for subtitle text; empty line ends this subtitle entry */ if (state->buf->len) g_string_append_c (state->buf, '\n'); g_string_append (state->buf, line); if (strlen (line) == 0) { ret = g_strdup (state->buf->str); subviewer_unescape_newlines (ret); strip_trailing_newlines (ret); g_string_truncate (state->buf, 0); state->state = 0; return ret; } return NULL; default: g_assert_not_reached (); return NULL; } } static gchar * parse_mpsub (ParserState * state, const gchar * line) { gchar *ret; float t1, t2; switch (state->state) { case 0: /* looking for two floats (offset, duration) */ if (sscanf (line, "%f %f", &t1, &t2) == 2) { state->state = 1; state->start_time += state->duration + GST_SECOND * t1; state->duration = GST_SECOND * t2; } return NULL; case 1: { /* No need to parse that text if it's out of segment */ gint64 clip_start = 0, clip_stop = 0; gboolean in_seg = FALSE; /* Check our segment start/stop */ in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME, state->start_time, state->start_time + state->duration, &clip_start, &clip_stop); if (in_seg) { state->start_time = clip_start; state->duration = clip_stop - clip_start; } else { state->state = 0; return NULL; } } /* looking for subtitle text; empty line ends this * subtitle entry */ if (state->buf->len) g_string_append_c (state->buf, '\n'); g_string_append (state->buf, line); if (strlen (line) == 0) { ret = g_strdup (state->buf->str); g_string_truncate (state->buf, 0); state->state = 0; return ret; } return NULL; default: g_assert_not_reached (); return NULL; } } static void parser_state_init (ParserState * state) { GST_DEBUG ("initialising parser"); if (state->buf) { g_string_truncate (state->buf, 0); } else { state->buf = g_string_new (NULL); } state->start_time = 0; state->duration = 0; state->max_duration = 0; /* no limit */ state->state = 0; state->segment = NULL; } static void parser_state_dispose (ParserState * state) { if (state->buf) { g_string_free (state->buf, TRUE); state->buf = NULL; } #ifndef GST_DISABLE_XML if (state->user_data) { sami_context_reset (state); } #endif } /* * FIXME: maybe we should pass along a second argument, the preceding * text buffer, because that is how this originally worked, even though * I don't really see the use of that. */ static GstSubParseFormat gst_sub_parse_data_format_autodetect (gchar * match_str) { static gboolean need_init_regexps = TRUE; static regex_t mdvd_rx; static regex_t subrip_rx; guint n1, n2, n3; /* initialize the regexps used the first time around */ if (need_init_regexps) { int err; char errstr[128]; need_init_regexps = FALSE; if ((err = regcomp (&mdvd_rx, "^\\{[0-9]+\\}\\{[0-9]+\\}", REG_EXTENDED | REG_NEWLINE | REG_NOSUB) != 0) || (err = regcomp (&subrip_rx, "^[0-9]([0-9]){0,3}(\x0d)?\x0a" "[0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9]{3}" " --> [0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9]{3}", REG_EXTENDED | REG_NEWLINE | REG_NOSUB)) != 0) { regerror (err, &subrip_rx, errstr, 127); GST_WARNING ("Compilation of subrip regex failed: %s", errstr); } } if (regexec (&mdvd_rx, match_str, 0, NULL, 0) == 0) { GST_LOG ("MicroDVD (frame based) format detected"); return GST_SUB_PARSE_FORMAT_MDVDSUB; } if (regexec (&subrip_rx, match_str, 0, NULL, 0) == 0) { GST_LOG ("SubRip (time based) format detected"); return GST_SUB_PARSE_FORMAT_SUBRIP; } if (!strncmp (match_str, "FORMAT=TIME", 11)) { GST_LOG ("MPSub (time based) format detected"); return GST_SUB_PARSE_FORMAT_MPSUB; } #ifndef GST_DISABLE_XML if (strstr (match_str, "") != NULL || strstr (match_str, "") != NULL) { GST_LOG ("SAMI (time based) format detected"); return GST_SUB_PARSE_FORMAT_SAMI; } #endif /* we're boldly assuming the first subtitle appears within the first hour */ if (sscanf (match_str, "0:%02u:%02u:", &n1, &n2) == 2 || sscanf (match_str, "0:%02u:%02u=", &n1, &n2) == 2 || sscanf (match_str, "00:%02u:%02u:", &n1, &n2) == 2 || sscanf (match_str, "00:%02u:%02u=", &n1, &n2) == 2 || sscanf (match_str, "00:%02u:%02u,%u=", &n1, &n2, &n3) == 3) { GST_LOG ("TMPlayer (time based) format detected"); return GST_SUB_PARSE_FORMAT_TMPLAYER; } if (sscanf (match_str, "[%u][%u]", &n1, &n2) == 2) { GST_LOG ("MPL2 (time based) format detected"); return GST_SUB_PARSE_FORMAT_MPL2; } if (strstr (match_str, "[INFORMATION]") != NULL) { GST_LOG ("SubViewer (time based) format detected"); return GST_SUB_PARSE_FORMAT_SUBVIEWER; } GST_DEBUG ("no subtitle format detected"); return GST_SUB_PARSE_FORMAT_UNKNOWN; } static GstCaps * gst_sub_parse_format_autodetect (GstSubParse * self) { gchar *data; GstSubParseFormat format; if (strlen (self->textbuf->str) < 35) { GST_DEBUG ("File too small to be a subtitles file"); return NULL; } data = g_strndup (self->textbuf->str, 35); format = gst_sub_parse_data_format_autodetect (data); g_free (data); self->parser_type = format; parser_state_init (&self->state); switch (format) { case GST_SUB_PARSE_FORMAT_MDVDSUB: self->parse_line = parse_mdvdsub; return gst_caps_new_simple ("text/x-pango-markup", NULL); case GST_SUB_PARSE_FORMAT_SUBRIP: self->parse_line = parse_subrip; return gst_caps_new_simple ("text/x-pango-markup", NULL); case GST_SUB_PARSE_FORMAT_MPSUB: self->parse_line = parse_mpsub; return gst_caps_new_simple ("text/plain", NULL); #ifndef GST_DISABLE_XML case GST_SUB_PARSE_FORMAT_SAMI: self->parse_line = parse_sami; sami_context_init (&self->state); return gst_caps_new_simple ("text/x-pango-markup", NULL); #endif case GST_SUB_PARSE_FORMAT_TMPLAYER: self->parse_line = parse_tmplayer; self->state.max_duration = 5 * GST_SECOND; return gst_caps_new_simple ("text/plain", NULL); case GST_SUB_PARSE_FORMAT_MPL2: self->parse_line = parse_mpl2; return gst_caps_new_simple ("text/x-pango-markup", NULL); case GST_SUB_PARSE_FORMAT_SUBVIEWER: self->parse_line = parse_subviewer; return gst_caps_new_simple ("text/plain", NULL); case GST_SUB_PARSE_FORMAT_UNKNOWN: default: GST_DEBUG ("no subtitle format detected"); GST_ELEMENT_ERROR (self, STREAM, WRONG_TYPE, ("The input is not a valid/supported subtitle file"), (NULL)); return NULL; } } static void feed_textbuf (GstSubParse * self, GstBuffer * buf) { gboolean discont; discont = GST_BUFFER_IS_DISCONT (buf); if (GST_BUFFER_OFFSET_IS_VALID (buf) && GST_BUFFER_OFFSET (buf) != self->offset) { self->offset = GST_BUFFER_OFFSET (buf); discont = TRUE; } if (discont) { GST_INFO ("discontinuity"); /* flush the parser state */ parser_state_init (&self->state); g_string_truncate (self->textbuf, 0); #ifndef GST_DISABLE_XML sami_context_reset (&self->state); #endif /* we could set a flag to make sure that the next buffer we push out also * has the DISCONT flag set, but there's no point really given that it's * subtitles which are discontinuous by nature. */ } self->textbuf = g_string_append_len (self->textbuf, (gchar *) GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf)); self->offset = GST_BUFFER_OFFSET (buf) + GST_BUFFER_SIZE (buf); self->next_offset = self->offset; gst_buffer_unref (buf); } static GstFlowReturn handle_buffer (GstSubParse * self, GstBuffer * buf) { GstFlowReturn ret = GST_FLOW_OK; GstCaps *caps = NULL; gchar *line, *subtitle; feed_textbuf (self, buf); /* make sure we know the format */ if (G_UNLIKELY (self->parser_type == GST_SUB_PARSE_FORMAT_UNKNOWN)) { if (!(caps = gst_sub_parse_format_autodetect (self))) { return GST_FLOW_UNEXPECTED; } if (!gst_pad_set_caps (self->srcpad, caps)) { gst_caps_unref (caps); return GST_FLOW_UNEXPECTED; } gst_caps_unref (caps); } while ((line = get_next_line (self)) && !self->flushing) { /* Set segment on our parser state machine */ self->state.segment = &self->segment; /* Now parse the line, out of segment lines will just return NULL */ GST_LOG_OBJECT (self, "Parsing line '%s'", line); subtitle = self->parse_line (&self->state, line); g_free (line); if (subtitle) { guint subtitle_len = strlen (subtitle); /* +1 for terminating NUL character */ ret = gst_pad_alloc_buffer_and_set_caps (self->srcpad, GST_BUFFER_OFFSET_NONE, subtitle_len + 1, GST_PAD_CAPS (self->srcpad), &buf); if (ret == GST_FLOW_OK) { /* copy terminating NUL character as well */ memcpy (GST_BUFFER_DATA (buf), subtitle, subtitle_len + 1); GST_BUFFER_SIZE (buf) = subtitle_len; GST_BUFFER_TIMESTAMP (buf) = self->state.start_time; GST_BUFFER_DURATION (buf) = self->state.duration; /* in some cases (e.g. tmplayer) we can only determine the duration * of a text chunk from the timestamp of the next text chunk; in those * cases, we probably want to limit the duration to something * reasonable, so we don't end up showing some text for e.g. 40 seconds * just because nothing else is being said during that time */ if (self->state.max_duration > 0 && GST_BUFFER_DURATION_IS_VALID (buf)) { if (GST_BUFFER_DURATION (buf) > self->state.max_duration) GST_BUFFER_DURATION (buf) = self->state.max_duration; } gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, self->state.start_time); GST_DEBUG_OBJECT (self, "Sending text '%s', %" GST_TIME_FORMAT " + %" GST_TIME_FORMAT, subtitle, GST_TIME_ARGS (self->state.start_time), GST_TIME_ARGS (self->state.duration)); ret = gst_pad_push (self->srcpad, buf); } /* move this forward (the tmplayer parser needs this) */ if (self->state.duration != GST_CLOCK_TIME_NONE) self->state.start_time += self->state.duration; g_free (subtitle); subtitle = NULL; if (ret != GST_FLOW_OK) { GST_DEBUG_OBJECT (self, "flow: %s", gst_flow_get_name (ret)); break; } } } return ret; } static GstFlowReturn gst_sub_parse_chain (GstPad * sinkpad, GstBuffer * buf) { GstFlowReturn ret; GstSubParse *self; self = GST_SUBPARSE (GST_PAD_PARENT (sinkpad)); /* Push newsegment if needed */ if (self->need_segment) { GST_LOG_OBJECT (self, "pushing newsegment event with %" GST_SEGMENT_FORMAT, &self->segment); gst_pad_push_event (self->srcpad, gst_event_new_new_segment (FALSE, self->segment.rate, self->segment.format, self->segment.last_stop, self->segment.stop, self->segment.time)); self->need_segment = FALSE; } ret = handle_buffer (self, buf); return ret; } static gboolean gst_sub_parse_sink_event (GstPad * pad, GstEvent * event) { GstSubParse *self = GST_SUBPARSE (gst_pad_get_parent (pad)); gboolean ret = FALSE; GST_DEBUG ("Handling %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS:{ /* Make sure the last subrip chunk is pushed out even * if the file does not have an empty line at the end */ if (self->parser_type == GST_SUB_PARSE_FORMAT_SUBRIP || self->parser_type == GST_SUB_PARSE_FORMAT_TMPLAYER || self->parser_type == GST_SUB_PARSE_FORMAT_MPL2) { GstBuffer *buf = gst_buffer_new_and_alloc (2 + 1); GST_DEBUG ("EOS. Pushing remaining text (if any)"); GST_BUFFER_DATA (buf)[0] = '\n'; GST_BUFFER_DATA (buf)[1] = '\n'; GST_BUFFER_DATA (buf)[2] = '\0'; /* play it safe */ GST_BUFFER_SIZE (buf) = 2; GST_BUFFER_OFFSET (buf) = self->offset; gst_sub_parse_chain (pad, buf); } ret = gst_pad_event_default (pad, event); break; } case GST_EVENT_NEWSEGMENT: { GstFormat format; gdouble rate; gint64 start, stop, time; gboolean update; gst_event_parse_new_segment (event, &update, &rate, &format, &start, &stop, &time); GST_DEBUG_OBJECT (self, "newsegment (%s)", gst_format_get_name (format)); if (format == GST_FORMAT_TIME) { gst_segment_set_newsegment (&self->segment, update, rate, format, start, stop, time); } else { /* if not time format, we'll either start with a 0 timestamp anyway or * it's following a seek in which case we'll have saved the requested * seek segment and don't want to overwrite it (remember that on a seek * we always just seek back to the start in BYTES format and just throw * away all text that's before the requested position; if the subtitles * come from an upstream demuxer, it won't be able to handle our BYTES * seek request and instead send us a newsegment from the seek request * it received via its video pads instead, so all is fine then too) */ } ret = TRUE; gst_event_unref (event); break; } case GST_EVENT_FLUSH_START: { self->flushing = TRUE; ret = gst_pad_event_default (pad, event); break; } case GST_EVENT_FLUSH_STOP: { self->flushing = FALSE; ret = gst_pad_event_default (pad, event); break; } default: ret = gst_pad_event_default (pad, event); break; } gst_object_unref (self); return ret; } static GstStateChangeReturn gst_sub_parse_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GstSubParse *self = GST_SUBPARSE (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* format detection will init the parser state */ self->offset = 0; self->next_offset = 0; self->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; self->valid_utf8 = TRUE; g_string_truncate (self->textbuf, 0); break; default: break; } ret = parent_class->change_state (element, transition); if (ret == GST_STATE_CHANGE_FAILURE) return ret; switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: parser_state_dispose (&self->state); self->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; break; default: break; } return ret; } /* * Typefind support. */ /* FIXME 0.11: these caps are ugly, use app/x-subtitle + type field or so; * also, give different subtitle formats really different types */ static GstStaticCaps mpl2_caps = GST_STATIC_CAPS ("application/x-subtitle-mpl2"); #define SUB_CAPS (gst_static_caps_get (&sub_caps)) static GstStaticCaps tmp_caps = GST_STATIC_CAPS ("application/x-subtitle-tmplayer"); #define TMP_CAPS (gst_static_caps_get (&tmp_caps)) static GstStaticCaps sub_caps = GST_STATIC_CAPS ("application/x-subtitle"); #define MPL2_CAPS (gst_static_caps_get (&mpl2_caps)) #ifndef GST_DISABLE_XML static GstStaticCaps smi_caps = GST_STATIC_CAPS ("application/x-subtitle-sami"); #define SAMI_CAPS (gst_static_caps_get (&smi_caps)) #endif static void gst_subparse_type_find (GstTypeFind * tf, gpointer private) { GstSubParseFormat format; const guint8 *data; GstCaps *caps; gchar *str; if (!(data = gst_type_find_peek (tf, 0, 36))) return; /* make sure string passed to _autodetect() is NUL-terminated */ str = g_strndup ((gchar *) data, 35); format = gst_sub_parse_data_format_autodetect (str); g_free (str); switch (format) { case GST_SUB_PARSE_FORMAT_MDVDSUB: GST_DEBUG ("MicroDVD format detected"); caps = SUB_CAPS; break; case GST_SUB_PARSE_FORMAT_SUBRIP: GST_DEBUG ("SubRip format detected"); caps = SUB_CAPS; break; case GST_SUB_PARSE_FORMAT_MPSUB: GST_DEBUG ("MPSub format detected"); caps = SUB_CAPS; break; #ifndef GST_DISABLE_XML case GST_SUB_PARSE_FORMAT_SAMI: GST_DEBUG ("SAMI (time-based) format detected"); caps = SAMI_CAPS; break; #endif case GST_SUB_PARSE_FORMAT_TMPLAYER: GST_DEBUG ("TMPlayer (time based) format detected"); caps = TMP_CAPS; break; /* FIXME: our MPL2 typefinding is not really good enough to warrant * returning a high probability (however, since we registered our * typefinder here with a rank of MARGINAL we should pretty much only * be called if most other typefinders have already run */ case GST_SUB_PARSE_FORMAT_MPL2: GST_DEBUG ("MPL2 (time based) format detected"); caps = MPL2_CAPS; break; case GST_SUB_PARSE_FORMAT_SUBVIEWER: GST_DEBUG ("SubViewer format detected"); caps = SUB_CAPS; break; default: case GST_SUB_PARSE_FORMAT_UNKNOWN: GST_DEBUG ("no subtitle format detected"); return; } /* if we're here, it's ok */ gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, caps); } static gboolean plugin_init (GstPlugin * plugin) { static gchar *sub_exts[] = { "srt", "sub", "mpsub", "mdvd", "smi", "txt", NULL }; GST_DEBUG_CATEGORY_INIT (sub_parse_debug, "subparse", 0, ".sub parser"); if (!gst_type_find_register (plugin, "subparse_typefind", GST_RANK_MARGINAL, gst_subparse_type_find, sub_exts, SUB_CAPS, NULL, NULL)) return FALSE; if (!gst_element_register (plugin, "subparse", GST_RANK_PRIMARY, GST_TYPE_SUBPARSE) || !gst_element_register (plugin, "ssaparse", GST_RANK_PRIMARY, GST_TYPE_SSA_PARSE)) { return FALSE; } return TRUE; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "subparse", "Subtitle parsing", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)