/* GStreamer * Copyright (C) <1999> Erik Walthinsen * Copyright (C) 2004 Ronald S. Bultje * Copyright (C) 2006 Tim-Philipp Müller * Copyright (C) 2016 Philippe Normand * Copyright (C) 2016 Jan Schmidt * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include "gstsubparse.h" #include "gstssaparse.h" #include "samiparse.h" #include "tmplayerparse.h" #include "mpl2parse.h" #include "qttextparse.h" #include "gstsubparseelements.h" #define DEFAULT_ENCODING NULL #define ATTRIBUTE_REGEX "\\s?[a-zA-Z0-9\\. \t\\(\\)]*" static const gchar *allowed_srt_tags[] = { "i", "b", "u", NULL }; static const gchar *allowed_vtt_tags[] = { "i", "b", "c", "u", "v", "ruby", "rt", NULL }; enum { PROP_0, PROP_ENCODING, PROP_VIDEOFPS }; 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 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; " "application/x-subtitle-dks; application/x-subtitle-qttext;" "application/x-subtitle-lrc; application/x-subtitle-vtt") ); static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("text/x-raw, format= { pango-markup, utf8 }") ); static gboolean gst_sub_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_sub_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_sub_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static GstStateChangeReturn gst_sub_parse_change_state (GstElement * element, GstStateChange transition); static GstFlowReturn gst_sub_parse_chain (GstPad * sinkpad, GstObject * parent, GstBuffer * buf); #define gst_sub_parse_parent_class parent_class G_DEFINE_TYPE (GstSubParse, gst_sub_parse, GST_TYPE_ELEMENT); GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (subparse, "subparse", GST_RANK_PRIMARY, GST_TYPE_SUBPARSE, sub_parse_element_init (plugin)) 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->detected_encoding) { g_free (subparse->detected_encoding); subparse->detected_encoding = NULL; } if (subparse->adapter) { g_object_unref (subparse->adapter); subparse->adapter = NULL; } if (subparse->textbuf) { g_string_free (subparse->textbuf, TRUE); subparse->textbuf = NULL; } 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); 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; gst_element_class_add_static_pad_template (element_class, &sink_templ); gst_element_class_add_static_pad_template (element_class, &src_templ); gst_element_class_set_static_metadata (element_class, "Subtitle parser", "Codec/Parser/Subtitle", "Parses subtitle (.sub) files into text streams", "Gustavo J. A. M. Carneiro , " "GStreamer maintainers "); 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 or any other " "Unicode 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)); g_object_class_install_property (object_class, PROP_VIDEOFPS, gst_param_spec_fraction ("video-fps", "Video framerate", "Framerate of the video stream. This is needed by some subtitle " "formats to synchronize subtitles and video properly. If not set " "and the subtitle format requires it subtitles may be out of sync.", 0, 1, G_MAXINT, 1, 24000, 1001, 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_pad_set_query_function (subparse->srcpad, GST_DEBUG_FUNCPTR (gst_sub_parse_src_query)); gst_element_add_pad (GST_ELEMENT (subparse), subparse->srcpad); subparse->textbuf = g_string_new (NULL); subparse->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; subparse->strip_pango_markup = FALSE; subparse->flushing = FALSE; gst_segment_init (&subparse->segment, GST_FORMAT_TIME); subparse->segment_seqnum = gst_util_seqnum_next (); subparse->need_segment = TRUE; subparse->encoding = g_strdup (DEFAULT_ENCODING); subparse->detected_encoding = NULL; subparse->adapter = gst_adapter_new (); subparse->fps_n = 24000; subparse->fps_d = 1001; } /* * Source pad functions. */ static gboolean gst_sub_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstSubParse *self = GST_SUBPARSE (parent); gboolean ret = FALSE; GST_DEBUG ("Handling %s query", GST_QUERY_TYPE_NAME (query)); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION:{ GstFormat fmt; gst_query_parse_position (query, &fmt, NULL); if (fmt != GST_FORMAT_TIME) { ret = gst_pad_peer_query (self->sinkpad, query); } else { ret = TRUE; gst_query_set_position (query, GST_FORMAT_TIME, self->segment.position); } break; } case GST_QUERY_SEEKING: { GstFormat fmt; gboolean seekable = FALSE; ret = TRUE; gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL); if (fmt == GST_FORMAT_TIME) { GstQuery *peerquery = gst_query_new_seeking (GST_FORMAT_BYTES); seekable = gst_pad_peer_query (self->sinkpad, peerquery); if (seekable) gst_query_parse_seeking (peerquery, NULL, &seekable, NULL, NULL); gst_query_unref (peerquery); } gst_query_set_seeking (query, fmt, seekable, seekable ? 0 : -1, -1); break; } default: ret = gst_pad_query_default (pad, parent, query); break; } return ret; } static gboolean gst_sub_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstSubParse *self = GST_SUBPARSE (parent); gboolean ret = FALSE; GST_DEBUG ("Handling %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { GstFormat format; GstSeekFlags flags; GstSeekType start_type, stop_type; gint64 start, stop; gdouble rate; gboolean update; gst_event_parse_seek (event, &rate, &format, &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, flags, GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_NONE, 0)); if (ret) { /* Apply the seek to our segment */ gst_segment_do_seek (&self->segment, rate, format, flags, start_type, start, stop_type, stop, &update); GST_DEBUG_OBJECT (self, "segment after seek: %" GST_SEGMENT_FORMAT, &self->segment); /* will mark need_segment when receiving segment from upstream, * after FLUSH and all that has happened, * rather than racing with chain */ } else { GST_WARNING_OBJECT (self, "seek to 0 bytes failed"); } gst_event_unref (event); break; } default: ret = gst_pad_event_default (pad, parent, event); break; } beach: 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; case PROP_VIDEOFPS: { subparse->fps_n = gst_value_get_fraction_numerator (value); subparse->fps_d = gst_value_get_fraction_denominator (value); GST_DEBUG_OBJECT (object, "video framerate set to %d/%d", subparse->fps_n, subparse->fps_d); if (!subparse->state.have_internal_fps) { subparse->state.fps_n = subparse->fps_n; subparse->state.fps_d = subparse->fps_d; } 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; case PROP_VIDEOFPS: gst_value_set_fraction (value, subparse->fps_n, subparse->fps_d); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (subparse); } static const gchar * gst_sub_parse_get_format_description (GstSubParseFormat format) { switch (format) { case GST_SUB_PARSE_FORMAT_MDVDSUB: return "MicroDVD"; case GST_SUB_PARSE_FORMAT_SUBRIP: return "SubRip"; case GST_SUB_PARSE_FORMAT_MPSUB: return "MPSub"; case GST_SUB_PARSE_FORMAT_SAMI: return "SAMI"; case GST_SUB_PARSE_FORMAT_TMPLAYER: return "TMPlayer"; case GST_SUB_PARSE_FORMAT_MPL2: return "MPL2"; case GST_SUB_PARSE_FORMAT_SUBVIEWER: return "SubViewer"; case GST_SUB_PARSE_FORMAT_DKS: return "DKS"; case GST_SUB_PARSE_FORMAT_VTT: return "WebVTT"; case GST_SUB_PARSE_FORMAT_QTTEXT: return "QTtext"; case GST_SUB_PARSE_FORMAT_LRC: return "LRC"; default: case GST_SUB_PARSE_FORMAT_UNKNOWN: break; } return NULL; } static gchar * convert_encoding (GstSubParse * self, const gchar * str, gsize len, gsize * consumed) { const gchar *encoding; GError *err = NULL; gchar *ret = NULL; *consumed = 0; /* First try any detected encoding */ if (self->detected_encoding) { ret = gst_sub_parse_gst_convert_to_utf8 (str, len, self->detected_encoding, consumed, &err); if (!err) return ret; GST_WARNING_OBJECT (self, "could not convert string from '%s' to UTF-8: %s", self->detected_encoding, err->message); g_free (self->detected_encoding); self->detected_encoding = NULL; g_clear_error (&err); } /* Otherwise check if it's UTF8 */ if (self->valid_utf8) { if (g_utf8_validate (str, len, NULL)) { GST_LOG_OBJECT (self, "valid UTF-8, no conversion needed"); *consumed = len; return g_strndup (str, len); } GST_INFO_OBJECT (self, "invalid UTF-8!"); self->valid_utf8 = FALSE; } /* Else try fallback */ 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 = gst_sub_parse_gst_convert_to_utf8 (str, len, encoding, consumed, &err); if (err) { GST_WARNING_OBJECT (self, "could not convert string from '%s' to UTF-8: %s", encoding, err->message); g_clear_error (&err); /* invalid input encoding, fall back to ISO-8859-15 (always succeeds) */ ret = gst_sub_parse_gst_convert_to_utf8 (str, len, "ISO-8859-15", consumed, 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 = g_strndup (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; guint64 clip_start = 0, clip_stop = 0; gboolean in_seg = FALSE; GString *markup; gchar *ret; /* style variables */ gboolean italic; gboolean bold; guint fontsize; gdouble fps = 0.0; if (sscanf (line, "{%u}{%u}", &start_frame, &end_frame) != 2) { GST_WARNING ("Parsing 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 (start_frame == 1 && end_frame == 1) { gchar *rest, *end = NULL; rest = g_strdup (line); g_strdelimit (rest, ",", '.'); fps = g_ascii_strtod (rest, &end); if (end != rest) { gst_util_double_to_fraction (fps, &state->fps_n, &state->fps_d); GST_INFO ("framerate from file: %d/%d ('%s')", state->fps_n, state->fps_d, rest); } g_free (rest); return NULL; } state->start_time = gst_util_uint64_scale (start_frame, GST_SECOND * state->fps_d, state->fps_n); state->duration = gst_util_uint64_scale (end_frame - start_frame, GST_SECOND * state->fps_d, state->fps_n); /* 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 = 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, gconstpointer allowed_tags_ptr, gboolean allows_tag_attributes) { gchar *res; GRegex *tag_regex; gchar *allowed_tags_pattern, *search_pattern; const gchar *replace_pattern; /* No processing needed if no escaped tag marker found in the string. */ if (strstr (txt, "<") == NULL) return; /* Build a list of alternates for our regexp. * FIXME: Could be built once and stored */ allowed_tags_pattern = g_strjoinv ("|", (gchar **) allowed_tags_ptr); /* Look for starting/ending escaped tags with optional attributes. */ search_pattern = g_strdup_printf ("<(/)?\\ *(%s)(%s)>", allowed_tags_pattern, ATTRIBUTE_REGEX); /* And unescape appropriately */ if (allows_tag_attributes) { replace_pattern = "<\\1\\2\\3>"; } else { replace_pattern = "<\\1\\2>"; } tag_regex = g_regex_new (search_pattern, 0, 0, NULL); res = g_regex_replace (tag_regex, txt, strlen (txt), 0, replace_pattern, 0, NULL); /* res will always be shorter than the input or identical, so this * copy is OK */ strcpy (txt, res); g_free (res); g_free (search_pattern); g_free (allowed_tags_pattern); g_regex_unref (tag_regex); } 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; 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 a fixed set of tags like , 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, gconstpointer allowed_tags_ptr) { gchar *cur, *next_tag; GPtrArray *open_tags = NULL; guint num_open_tags = 0; const gchar *iter_tag; guint offset = 0; guint index; gchar *cur_tag; gchar *end_tag; GRegex *tag_regex; GMatchInfo *match_info; gchar **allowed_tags = (gchar **) allowed_tags_ptr; g_assert (*p_txt != NULL); open_tags = g_ptr_array_new_with_free_func (g_free); cur = *p_txt; while (*cur != '\0') { next_tag = strchr (cur, '<'); if (next_tag == NULL) break; offset = 0; index = 0; while (index < g_strv_length (allowed_tags)) { iter_tag = allowed_tags[index]; /* Look for a white listed tag */ cur_tag = g_strconcat ("<", iter_tag, ATTRIBUTE_REGEX, ">", NULL); tag_regex = g_regex_new (cur_tag, 0, 0, NULL); (void) g_regex_match (tag_regex, next_tag, 0, &match_info); if (g_match_info_matches (match_info)) { gint start_pos, end_pos; gchar *word = g_match_info_fetch (match_info, 0); g_match_info_fetch_pos (match_info, 0, &start_pos, &end_pos); if (start_pos == 0) { offset = strlen (word); } g_free (word); } g_match_info_free (match_info); g_regex_unref (tag_regex); g_free (cur_tag); index++; if (offset) { /* OK we found a tag, let's keep track of it */ g_ptr_array_add (open_tags, g_ascii_strdown (iter_tag, -1)); ++num_open_tags; break; } } if (offset) { next_tag += offset; cur = next_tag; continue; } if (*next_tag == '<' && *(next_tag + 1) == '/') { end_tag = strchr (cur, '>'); if (end_tag) { const gchar *last = NULL; if (num_open_tags > 0) last = g_ptr_array_index (open_tags, num_open_tags - 1); if (num_open_tags == 0 || g_ascii_strncasecmp (end_tag - 1, last, strlen (last))) { GST_LOG ("broken input, closing tag '%s' is not open", next_tag); /* Move everything after the tag end, including closing \0 */ memmove (next_tag, end_tag + 1, strlen (end_tag)); cur = next_tag; continue; } else { --num_open_tags; g_ptr_array_remove_index (open_tags, num_open_tags); } } } ++next_tag; 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 '%s'", (char *) g_ptr_array_index (open_tags, num_open_tags - 1)); g_string_append_c (s, '<'); g_string_append_c (s, '/'); g_string_append (s, g_ptr_array_index (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); } g_ptr_array_free (open_tags, TRUE); } static gboolean parse_subrip_time (const gchar * ts_string, GstClockTime * t) { gchar s[128] = { '\0', }; gchar *end, *p; guint hour, min, sec, msec, len; while (*ts_string == ' ') ++ts_string; g_strlcpy (s, ts_string, sizeof (s)); if ((end = strstr (s, "-->"))) *end = '\0'; g_strchomp (s); /* ms may be in these formats: * hh:mm:ss,500 = 500ms * hh:mm:ss, 5 = 5ms * hh:mm:ss, 5 = 50ms * hh:mm:ss, 50 = 50ms * hh:mm:ss,5 = 500ms * and the same with . instead of ,. * sscanf() doesn't differentiate between ' 5' and '5' so munge * the white spaces within the timestamp to '0' (I'm sure there's a * way to make sscanf() do this for us, but how?) */ g_strdelimit (s, " ", '0'); g_strdelimit (s, ".", ','); /* make sure we have exactly three digits after he comma */ p = strchr (s, ','); if (p == NULL) { /* If there isn't a ',' the timestamp is broken */ /* https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/532#note_100179 */ GST_WARNING ("failed to parse subrip timestamp string '%s'", s); return FALSE; } ++p; len = strlen (p); if (len > 3) { p[3] = '\0'; } else while (len < 3) { g_strlcat (&p[len], "0", 2); ++len; } GST_LOG ("parsing timestamp '%s'", s); if (sscanf (s, "%u:%u:%u,%u", &hour, &min, &sec, &msec) != 4) { /* https://www.w3.org/TR/webvtt1/#webvtt-timestamp * * The hours component is optional with webVTT, for example * mm:ss,500 is a valid webVTT timestamp. When not present, * hours is 0. */ hour = 0; if (sscanf (s, "%u:%u,%u", &min, &sec, &msec) != 3) { GST_WARNING ("failed to parse subrip timestamp string '%s'", s); return FALSE; } } *t = ((hour * 3600) + (min * 60) + sec) * GST_SECOND + msec * GST_MSECOND; return TRUE; } /* cue settings are part of the WebVTT specification. They are * declared after the time interval in the first line of the * cue. Example: 00:00:01,000 --> 00:00:02,000 D:vertical-lr A:start * See also http://www.whatwg.org/specs/web-apps/current-work/webvtt.html */ static void parse_webvtt_cue_settings (ParserState * state, const gchar * settings) { gchar **splitted_settings = g_strsplit_set (settings, " \t", -1); gint i = 0; gint16 text_position, text_size; gint16 line_position; gboolean vertical_found = FALSE; gboolean alignment_found = FALSE; while (i < g_strv_length (splitted_settings)) { gboolean valid_tag = FALSE; switch (splitted_settings[i][0]) { case 'T': if (sscanf (splitted_settings[i], "T:%" G_GINT16_FORMAT "%%", &text_position) > 0) { state->text_position = (guint8) text_position; valid_tag = TRUE; } break; case 'D': if (strlen (splitted_settings[i]) > 2) { vertical_found = TRUE; g_free (state->vertical); state->vertical = g_strdup (splitted_settings[i] + 2); valid_tag = TRUE; } break; case 'L': if (g_str_has_suffix (splitted_settings[i], "%")) { if (sscanf (splitted_settings[i], "L:%" G_GINT16_FORMAT "%%", &line_position) > 0) { state->line_position = line_position; valid_tag = TRUE; } } else { if (sscanf (splitted_settings[i], "L:%" G_GINT16_FORMAT, &line_position) > 0) { state->line_number = line_position; valid_tag = TRUE; } } break; case 'S': if (sscanf (splitted_settings[i], "S:%" G_GINT16_FORMAT "%%", &text_size) > 0) { state->text_size = (guint8) text_size; valid_tag = TRUE; } break; case 'A': if (strlen (splitted_settings[i]) > 2) { g_free (state->alignment); state->alignment = g_strdup (splitted_settings[i] + 2); alignment_found = TRUE; valid_tag = TRUE; } break; default: break; } if (!valid_tag) { GST_LOG ("Invalid or unrecognised setting found: %s", splitted_settings[i]); } i++; } g_strfreev (splitted_settings); if (!vertical_found) { g_free (state->vertical); state->vertical = g_strdup (""); } if (!alignment_found) { g_free (state->alignment); state->alignment = g_strdup (""); } } static gchar * parse_subrip (ParserState * state, const gchar * line) { gchar *ret; switch (state->state) { case 0:{ char *endptr; guint64 id; /* looking for a single integer as a Cue ID, but we * don't actually use it */ errno = 0; id = g_ascii_strtoull (line, &endptr, 10); if (id == G_MAXUINT64 && errno == ERANGE) state->state = 1; else if (id == 0 && errno == EINVAL) state->state = 1; else if (endptr != line && *endptr == '\0') state->state = 1; return NULL; } case 1: { GstClockTime ts_start, ts_end; gchar *end_time; /* looking for start_time --> end_time */ if ((end_time = strstr (line, " --> ")) && parse_subrip_time (line, &ts_start) && parse_subrip_time (end_time + strlen (" --> "), &ts_end) && state->start_time <= ts_end) { state->state = 2; state->start_time = ts_start; state->duration = ts_end - ts_start; } else { GST_DEBUG ("error parsing subrip time line '%s'", line); state->state = 0; } return NULL; } case 2: { /* No need to parse that text if it's out of segment */ guint64 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, state->allowed_tags, state->allows_tag_attributes); subrip_remove_unhandled_tags (ret); strip_trailing_newlines (ret); subrip_fix_up_markup (&ret, state->allowed_tags); return ret; } return NULL; default: g_return_val_if_reached (NULL); } } static gchar * parse_lrc (ParserState * state, const gchar * line) { gint m, s, c; const gchar *start; gint milli; if (line[0] != '[') return NULL; if (sscanf (line, "[%u:%02u.%03u]", &m, &s, &c) != 3 && sscanf (line, "[%u:%02u.%02u]", &m, &s, &c) != 3) return NULL; start = strchr (line, ']'); if (start - line == 9) milli = 10; else milli = 1; state->start_time = gst_util_uint64_scale (m, 60 * GST_SECOND, 1) + gst_util_uint64_scale (s, GST_SECOND, 1) + gst_util_uint64_scale (c, milli * GST_MSECOND, 1); state->duration = GST_CLOCK_TIME_NONE; return g_strdup (start + 1); } /* WebVTT is a new subtitle format for the upcoming HTML5 video track * element. This format is similar to Subrip, the biggest differences * are that there can be cue settings detailing how to display the cue * text and more markup tags are allowed. * See also http://www.whatwg.org/specs/web-apps/current-work/webvtt.html */ static gchar * parse_webvtt (ParserState * state, const gchar * line) { /* Cue IDs are optional in WebVTT, but not in subrip, * so when in state 0 (cue ID), also check if we're * already at the start --> end time marker */ if (state->state == 0 || state->state == 1) { GstClockTime ts_start, ts_end; gchar *end_time; gchar *cue_settings = NULL; /* looking for start_time --> end_time */ if ((end_time = strstr (line, " --> ")) && parse_subrip_time (line, &ts_start) && parse_subrip_time (end_time + strlen (" --> "), &ts_end) && state->start_time <= ts_end) { state->state = 2; state->start_time = ts_start; state->duration = ts_end - ts_start; cue_settings = strstr (end_time + strlen (" --> "), " "); } else { GST_DEBUG ("error parsing subrip time line '%s'", line); state->state = 0; } state->text_position = 0; state->text_size = 0; state->line_position = 0; state->line_number = 0; if (cue_settings) parse_webvtt_cue_settings (state, cue_settings + 1); else { g_free (state->vertical); state->vertical = g_strdup (""); g_free (state->alignment); state->alignment = g_strdup (""); } return NULL; } else return parse_subrip (state, line); } static void unescape_newlines_br (gchar * read) { gchar *write = read; /* Replace all occurrences 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 */ guint64 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); unescape_newlines_br (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 */ guint64 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 const gchar * dks_skip_timestamp (const gchar * line) { while (*line && *line != ']') line++; if (*line == ']') line++; return line; } static gchar * parse_dks (ParserState * state, const gchar * line) { guint h, m, s; switch (state->state) { case 0: /* Looking for the start time and text */ if (sscanf (line, "[%u:%u:%u]", &h, &m, &s) == 3) { const gchar *text; state->start_time = (((guint64) h) * 3600 + m * 60 + s) * GST_SECOND; text = dks_skip_timestamp (line); if (*text) { state->state = 1; g_string_append (state->buf, text); } } return NULL; case 1: { guint64 clip_start = 0, clip_stop = 0; gboolean in_seg; gchar *ret; /* Looking for the end time */ if (sscanf (line, "[%u:%u:%u]", &h, &m, &s) == 3) { state->state = 0; state->duration = (((guint64) h) * 3600 + m * 60 + s) * GST_SECOND - state->start_time; } else { GST_WARNING ("Failed to parse subtitle end time"); return NULL; } /* Check if this subtitle is out of the current segment */ 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) { return NULL; } state->start_time = clip_start; state->duration = clip_stop - clip_start; ret = g_strdup (state->buf->str); g_string_truncate (state->buf, 0); unescape_newlines_br (ret); return ret; } 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 (GstSubParse * self, ParserState * state) { if (state->buf) { g_string_free (state->buf, TRUE); state->buf = NULL; } g_free (state->vertical); state->vertical = NULL; g_free (state->alignment); state->alignment = NULL; if (state->user_data) { switch (self->parser_type) { case GST_SUB_PARSE_FORMAT_QTTEXT: qttext_context_deinit (state); break; case GST_SUB_PARSE_FORMAT_SAMI: sami_context_deinit (state); break; default: break; } } state->allowed_tags = NULL; } static GstCaps * gst_sub_parse_format_autodetect (GstSubParse * self) { gchar *data; GstSubParseFormat format; if (strlen (self->textbuf->str) < 6) { 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; self->subtitle_codec = gst_sub_parse_get_format_description (format); parser_state_init (&self->state); self->state.allowed_tags = NULL; switch (format) { case GST_SUB_PARSE_FORMAT_MDVDSUB: self->parse_line = parse_mdvdsub; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_SUBRIP: self->state.allowed_tags = (gpointer) allowed_srt_tags; self->state.allows_tag_attributes = FALSE; self->parse_line = parse_subrip; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_MPSUB: self->parse_line = parse_mpsub; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "utf8", NULL); case GST_SUB_PARSE_FORMAT_SAMI: self->parse_line = parse_sami; sami_context_init (&self->state); return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_TMPLAYER: self->parse_line = parse_tmplayer; self->state.max_duration = 5 * GST_SECOND; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "utf8", NULL); case GST_SUB_PARSE_FORMAT_MPL2: self->parse_line = parse_mpl2; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_DKS: self->parse_line = parse_dks; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "utf8", NULL); case GST_SUB_PARSE_FORMAT_VTT: self->state.allowed_tags = (gpointer) allowed_vtt_tags; self->state.allows_tag_attributes = TRUE; self->parse_line = parse_webvtt; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_SUBVIEWER: self->parse_line = parse_subviewer; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "utf8", NULL); case GST_SUB_PARSE_FORMAT_QTTEXT: self->parse_line = parse_qttext; qttext_context_init (&self->state); return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "pango-markup", NULL); case GST_SUB_PARSE_FORMAT_LRC: self->parse_line = parse_lrc; return gst_caps_new_simple ("text/x-raw", "format", G_TYPE_STRING, "utf8", 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; gsize consumed; gchar *input = NULL; const guint8 *data; gsize avail; 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); gst_adapter_clear (self->adapter); if (self->parser_type == GST_SUB_PARSE_FORMAT_SAMI) sami_context_reset (&self->state); /* 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->offset += gst_buffer_get_size (buf); gst_adapter_push (self->adapter, buf); avail = gst_adapter_available (self->adapter); data = gst_adapter_map (self->adapter, avail); input = convert_encoding (self, (const gchar *) data, avail, &consumed); if (input && consumed > 0) { self->textbuf = g_string_append (self->textbuf, input); gst_adapter_unmap (self->adapter); gst_adapter_flush (self->adapter, consumed); } else { gst_adapter_unmap (self->adapter); } g_free (input); } static void xml_text (GMarkupParseContext * context, const gchar * text, gsize text_len, gpointer user_data, GError ** error) { gchar **accum = (gchar **) user_data; gchar *concat; if (*accum) { concat = g_strconcat (*accum, text, NULL); g_free (*accum); *accum = concat; } else { *accum = g_strdup (text); } } static gchar * strip_pango_markup (gchar * markup, GError ** error) { GMarkupParser parser = { 0, }; GMarkupParseContext *context; gchar *accum = NULL; parser.text = xml_text; context = g_markup_parse_context_new (&parser, 0, &accum, NULL); g_markup_parse_context_parse (context, "", 6, NULL); g_markup_parse_context_parse (context, markup, strlen (markup), error); g_markup_parse_context_parse (context, "", 7, NULL); if (*error) goto error; g_markup_parse_context_end_parse (context, error); if (*error) goto error; done: g_markup_parse_context_free (context); return accum; error: g_free (accum); accum = NULL; goto done; } static gboolean gst_sub_parse_negotiate (GstSubParse * self, GstCaps * preferred) { GstCaps *caps; gboolean ret = FALSE; const GstStructure *s1, *s2; caps = gst_pad_get_allowed_caps (self->srcpad); s1 = gst_caps_get_structure (preferred, 0); if (!g_strcmp0 (gst_structure_get_string (s1, "format"), "utf8")) { GstCaps *intersected = gst_caps_intersect (caps, preferred); gst_caps_unref (caps); caps = intersected; } caps = gst_caps_fixate (caps); if (gst_caps_is_empty (caps)) { goto done; } s2 = gst_caps_get_structure (caps, 0); self->strip_pango_markup = !g_strcmp0 (gst_structure_get_string (s2, "format"), "utf8") && !g_strcmp0 (gst_structure_get_string (s1, "format"), "pango-markup"); if (self->strip_pango_markup) { GST_INFO_OBJECT (self, "We will convert from pango-markup to utf8"); } ret = gst_pad_set_caps (self->srcpad, caps); done: gst_caps_unref (caps); return ret; } static GstFlowReturn check_initial_events (GstSubParse * self) { gboolean need_tags = FALSE; /* make sure we know the format */ if (G_UNLIKELY (self->parser_type == GST_SUB_PARSE_FORMAT_UNKNOWN)) { GstCaps *preferred; if (!(preferred = gst_sub_parse_format_autodetect (self))) { return GST_FLOW_NOT_NEGOTIATED; } if (!gst_sub_parse_negotiate (self, preferred)) { gst_caps_unref (preferred); return GST_FLOW_NOT_NEGOTIATED; } gst_caps_unref (preferred); need_tags = TRUE; } /* Push newsegment if needed */ if (self->need_segment) { GstEvent *segment_event = gst_event_new_segment (&self->segment); GST_LOG_OBJECT (self, "pushing newsegment event with %" GST_SEGMENT_FORMAT, &self->segment); gst_event_set_seqnum (segment_event, self->segment_seqnum); gst_pad_push_event (self->srcpad, segment_event); self->need_segment = FALSE; } if (need_tags) { /* push tags */ if (self->subtitle_codec != NULL) { GstTagList *tags; tags = gst_tag_list_new (GST_TAG_SUBTITLE_CODEC, self->subtitle_codec, NULL); gst_pad_push_event (self->srcpad, gst_event_new_tag (tags)); } } return GST_FLOW_OK; } static GstFlowReturn handle_buffer (GstSubParse * self, GstBuffer * buf) { GstFlowReturn ret = GST_FLOW_OK; gchar *line, *subtitle; GST_DEBUG_OBJECT (self, "%" GST_PTR_FORMAT, buf); if (self->first_buffer) { GstMapInfo map; gst_buffer_map (buf, &map, GST_MAP_READ); self->detected_encoding = gst_sub_parse_detect_encoding ((gchar *) map.data, map.size); gst_buffer_unmap (buf, &map); self->first_buffer = FALSE; self->state.fps_n = self->fps_n; self->state.fps_d = self->fps_d; } feed_textbuf (self, buf); ret = check_initial_events (self); if (ret != GST_FLOW_OK) return ret; while (!self->flushing && (line = get_next_line (self))) { guint offset = 0; /* 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, "State %d. Parsing line '%s'", self->state.state, line + offset); subtitle = self->parse_line (&self->state, line + offset); g_free (line); if (subtitle) { guint subtitle_len; if (self->strip_pango_markup) { GError *error = NULL; gchar *stripped; if ((stripped = strip_pango_markup (subtitle, &error))) { g_free (subtitle); subtitle = stripped; } else { GST_WARNING_OBJECT (self, "Failed to strip pango markup: %s", error->message); } } subtitle_len = strlen (subtitle); /* +1 for terminating NUL character */ buf = gst_buffer_new_and_alloc (subtitle_len + 1); /* copy terminating NUL character as well */ gst_buffer_fill (buf, 0, subtitle, subtitle_len + 1); gst_buffer_set_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; } self->segment.position = 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)); g_free (self->state.vertical); self->state.vertical = NULL; g_free (self->state.alignment); self->state.alignment = NULL; 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, GstObject * parent, GstBuffer * buf) { GstFlowReturn ret; GstSubParse *self; self = GST_SUBPARSE (parent); ret = handle_buffer (self, buf); return ret; } static gboolean gst_sub_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstSubParse *self = GST_SUBPARSE (parent); gboolean ret = FALSE; GST_LOG_OBJECT (self, "%s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_STREAM_GROUP_DONE: 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 || self->parser_type == GST_SUB_PARSE_FORMAT_QTTEXT || self->parser_type == GST_SUB_PARSE_FORMAT_VTT) { gchar term_chars[] = { '\n', '\n', '\0' }; GstBuffer *buf = gst_buffer_new_and_alloc (2 + 1); GST_DEBUG_OBJECT (self, "%s: force pushing of any remaining text", GST_EVENT_TYPE_NAME (event)); gst_buffer_fill (buf, 0, term_chars, 3); gst_buffer_set_size (buf, 2); GST_BUFFER_OFFSET (buf) = self->offset; gst_sub_parse_chain (pad, parent, buf); } ret = gst_pad_event_default (pad, parent, event); break; } case GST_EVENT_SEGMENT: { const GstSegment *s; gst_event_parse_segment (event, &s); if (s->format == GST_FORMAT_TIME) gst_event_copy_segment (event, &self->segment); GST_DEBUG_OBJECT (self, "newsegment (%s)", gst_format_get_name (self->segment.format)); self->segment_seqnum = gst_event_get_seqnum (event); /* 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); /* in either case, let's not simply discard this event; * trigger sending of the saved requested seek segment * or the one taken here from upstream */ self->need_segment = TRUE; break; } case GST_EVENT_GAP: { ret = check_initial_events (self); if (ret == GST_FLOW_OK) { ret = gst_pad_event_default (pad, parent, event); } else { gst_event_unref (event); } break; } case GST_EVENT_FLUSH_START: { self->flushing = TRUE; ret = gst_pad_event_default (pad, parent, event); break; } case GST_EVENT_FLUSH_STOP: { self->flushing = FALSE; ret = gst_pad_event_default (pad, parent, event); break; } default: ret = gst_pad_event_default (pad, parent, event); break; } 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->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; self->strip_pango_markup = FALSE; self->valid_utf8 = TRUE; self->first_buffer = TRUE; g_free (self->detected_encoding); self->detected_encoding = NULL; g_string_truncate (self->textbuf, 0); gst_adapter_clear (self->adapter); break; default: break; } ret = GST_ELEMENT_CLASS (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, &self->state); self->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN; break; default: break; } return ret; }