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gstreamer/subprojects/gst-plugins-base/gst/subparse/gstsubparse.c
Sebastian Dröge 4c40f73b70 subparse: Check for NULL return of strchr() when parsing LRC subtitles 
Thanks to Antonio Morales for finding and reporting the issue.

Fixes GHSL-2024-263
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3892

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8039>
2024-12-03 13:13:40 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2004 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2016 Philippe Normand <pnormand@igalia.com>
* Copyright (C) 2016 Jan Schmidt <jan@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <glib.h>
#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/Decoder/Subtitle",
"Parses subtitle (.sub) files into text streams",
"Gustavo J. A. M. Carneiro <gjc@inescporto.pt>, "
"GStreamer maintainers <gstreamer-devel@lists.freedesktop.org>");
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;
}
/* Forward seek event first and return if succeeded */
ret = gst_pad_event_default (pad, parent, g_steal_pointer (&event));
if (ret)
break;
/* 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");
}
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, "<span");
if (italic)
g_string_append (markup, " style=\"italic\"");
if (bold)
g_string_append (markup, " weight=\"bold\"");
if (fontsize)
g_string_append_printf (markup, " size=\"%u\"", fontsize * 1000);
g_string_append_printf (markup, ">%s</span>", 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
* <i></i>, <u></u>, and <b></b>. 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, "&lt;") == 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 ("&lt;(/)?\\ *(%s)(%s)&gt;",
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 ("&lt;");
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, "&lt;", 4) == 0 && (gt = strstr (pos + 4, "&gt;"))) {
if (subrip_remove_unhandled_tag (pos, gt + strlen ("&gt;")))
--pos;
}
}
}
/* we only allow a fixed set of tags like <i>, <u> and <b>, 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 (next_tag, '>');
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);
cur = end_tag + 1;
continue;
}
}
}
++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, ']');
// sscanf() does not check for the trailing ] but only up to the last
// placeholder, so there might be no ] at the end.
if (!start)
return NULL;
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, "<root>", 6, NULL);
g_markup_parse_context_parse (context, markup, strlen (markup), error);
g_markup_parse_context_parse (context, "</root>", 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;
}
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