gstreamer/gst/subparse/gstsubparse.c
Stefan Kost 0afac375b4 Fix #337365 (g_type_class_ref <-> g_type_class_peek_parent)
Original commit message from CVS:
* ext/alsa/gstalsamixeroptions.c:
(gst_alsa_mixer_options_class_init):
* ext/alsa/gstalsamixertrack.c: (gst_alsa_mixer_track_class_init):
* ext/ogg/gstoggdemux.c: (gst_ogg_pad_class_init):
* ext/ogg/gstoggmux.c: (gst_ogg_mux_class_init):
* ext/ogg/gstoggparse.c: (gst_ogg_parse_class_init):
* gst-libs/gst/audio/gstaudioclock.c: (gst_audio_clock_class_init):
* gst-libs/gst/audio/gstaudiofilter.c:
(gst_audio_filter_class_init):
* gst-libs/gst/audio/gstaudiosink.c:
(gst_audioringbuffer_class_init):
* gst-libs/gst/audio/gstaudiosrc.c:
(gst_audioringbuffer_class_init):
* gst-libs/gst/audio/gstringbuffer.c: (gst_ring_buffer_class_init):
* gst-libs/gst/interfaces/colorbalancechannel.c:
(gst_color_balance_channel_class_init):
* gst-libs/gst/interfaces/mixeroptions.c:
(gst_mixer_options_class_init):
* gst-libs/gst/interfaces/mixertrack.c:
(gst_mixer_track_class_init):
* gst-libs/gst/interfaces/tunerchannel.c:
(gst_tuner_channel_class_init):
* gst-libs/gst/interfaces/tunernorm.c: (gst_tuner_norm_class_init):
* gst-libs/gst/netbuffer/gstnetbuffer.c:
(gst_netbuffer_class_init):
* gst-libs/gst/rtp/gstbasertppayload.c:
(gst_basertppayload_class_init):
* gst/playback/gstdecodebin.c: (gst_decode_bin_class_init):
* gst/playback/gstplaybasebin.c: (gst_play_base_bin_class_init):
* gst/playback/gstplaybin.c: (gst_play_bin_class_init):
* gst/playback/gststreaminfo.c: (gst_stream_info_class_init):
* gst/playback/gststreamselector.c:
(gst_stream_selector_class_init):
* gst/subparse/gstsubparse.c: (gst_sub_parse_class_init):
* gst/tcp/gsttcpclientsink.c: (gst_tcp_client_sink_class_init):
* sys/v4l/gstv4lcolorbalance.c:
(gst_v4l_color_balance_channel_class_init):
* sys/v4l/gstv4ljpegsrc.c: (gst_v4ljpegsrc_class_init):
* sys/v4l/gstv4lmjpegsink.c: (gst_v4lmjpegsink_class_init):
* sys/v4l/gstv4lmjpegsrc.c: (gst_v4lmjpegsrc_class_init):
* sys/v4l/gstv4ltuner.c: (gst_v4l_tuner_channel_class_init),
(gst_v4l_tuner_norm_class_init):
* sys/ximage/ximagesink.c: (gst_ximagesink_class_init):
* sys/xvimage/xvimagesink.c: (gst_xvimagesink_class_init):
* tests/old/testsuite/alsa/sinesrc.c: (sinesrc_class_init):
Fix #337365 (g_type_class_ref <-> g_type_class_peek_parent)
2006-04-08 21:02:53 +00:00

932 lines
26 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (c) 2004 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <regex.h>
#include "gstsubparse.h"
#include "gstssaparse.h"
GST_DEBUG_CATEGORY_STATIC (sub_parse_debug);
#define GST_CAT_DEFAULT sub_parse_debug
static GstElementDetails sub_parse_details =
GST_ELEMENT_DETAILS ("Subtitle parser",
"Codec/Parser/Subtitle",
"Parses subtitle (.sub) files into text streams",
"Gustavo J. A. M. Carneiro <gjc@inescporto.pt>\n"
"Ronald S. Bultje <rbultje@ronald.bitfreak.net>");
static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-subtitle")
);
static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("text/plain; text/x-pango-markup")
);
static void gst_sub_parse_base_init (GstSubParseClass * klass);
static void gst_sub_parse_class_init (GstSubParseClass * klass);
static void gst_sub_parse_init (GstSubParse * subparse);
static gboolean gst_sub_parse_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_sub_parse_sink_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn gst_sub_parse_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_sub_parse_chain (GstPad * sinkpad, GstBuffer * buf);
static GstElementClass *parent_class = NULL;
GType
gst_sub_parse_get_type (void)
{
static GType sub_parse_type = 0;
if (!sub_parse_type) {
static const GTypeInfo sub_parse_info = {
sizeof (GstSubParseClass),
(GBaseInitFunc) gst_sub_parse_base_init,
NULL,
(GClassInitFunc) gst_sub_parse_class_init,
NULL,
NULL,
sizeof (GstSubParse),
0,
(GInstanceInitFunc) gst_sub_parse_init,
};
sub_parse_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstSubParse", &sub_parse_info, 0);
}
return sub_parse_type;
}
static void
gst_sub_parse_base_init (GstSubParseClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_templ));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_templ));
gst_element_class_set_details (element_class, &sub_parse_details);
}
static void
gst_sub_parse_dispose (GObject * object)
{
GstSubParse *subparse = GST_SUBPARSE (object);
GST_DEBUG_OBJECT (subparse, "cleaning up subtitle parser");
if (subparse->segment) {
gst_segment_free (subparse->segment);
subparse->segment = 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);
parent_class = g_type_class_peek_parent (klass);
object_class->dispose = gst_sub_parse_dispose;
element_class->change_state = gst_sub_parse_change_state;
}
static void
gst_sub_parse_init (GstSubParse * subparse)
{
subparse->sinkpad = gst_pad_new_from_static_template (&sink_templ, "sink");
gst_pad_set_chain_function (subparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_sub_parse_chain));
gst_pad_set_event_function (subparse->sinkpad,
GST_DEBUG_FUNCPTR (gst_sub_parse_sink_event));
gst_element_add_pad (GST_ELEMENT (subparse), subparse->sinkpad);
subparse->srcpad = gst_pad_new_from_static_template (&src_templ, "src");
gst_pad_set_event_function (subparse->srcpad,
GST_DEBUG_FUNCPTR (gst_sub_parse_src_event));
gst_element_add_pad (GST_ELEMENT (subparse), subparse->srcpad);
subparse->textbuf = g_string_new (NULL);
subparse->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN;
subparse->flushing = FALSE;
subparse->segment = gst_segment_new ();
if (subparse->segment) {
gst_segment_init (subparse->segment, GST_FORMAT_TIME);
subparse->need_segment = TRUE;
} else {
GST_WARNING_OBJECT (subparse, "segment creation failed");
g_assert_not_reached ();
}
}
/*
* Source pad functions.
*/
static gboolean
gst_sub_parse_src_event (GstPad * pad, GstEvent * event)
{
GstSubParse *self = GST_SUBPARSE (gst_pad_get_parent (pad));
gboolean ret = FALSE;
GST_DEBUG ("Handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
{
GstFormat format;
GstSeekType start_type, stop_type;
gint64 start, stop;
gdouble rate;
gboolean update;
gst_event_parse_seek (event, &rate, &format, &self->segment_flags,
&start_type, &start, &stop_type, &stop);
if (format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (self, "we only support seeking in TIME format");
gst_event_unref (event);
goto beach;
}
/* Convert that seek to a seeking in bytes at position 0,
FIXME: could use an index */
ret = gst_pad_push_event (self->sinkpad,
gst_event_new_seek (rate, GST_FORMAT_BYTES, self->segment_flags,
GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_NONE, 0));
if (ret) {
/* Apply the seek to our segment */
gst_segment_set_seek (self->segment, rate, format, self->segment_flags,
start_type, start, stop_type, stop, &update);
GST_DEBUG_OBJECT (self, "segment configured from %" GST_TIME_FORMAT
" to %" GST_TIME_FORMAT ", position %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->segment->start),
GST_TIME_ARGS (self->segment->stop),
GST_TIME_ARGS (self->segment->last_stop));
self->next_offset = 0;
self->need_segment = TRUE;
} else {
GST_WARNING_OBJECT (self, "seek to 0 bytes failed");
}
gst_event_unref (event);
break;
}
default:
ret = gst_pad_event_default (pad, event);
break;
}
beach:
gst_object_unref (self);
return ret;
}
static gchar *
convert_encoding (GstSubParse * self, const gchar * str, gsize len)
{
const gchar *encoding;
GError *err = NULL;
gchar *ret;
if (self->valid_utf8) {
if (g_utf8_validate (str, len, NULL)) {
GST_LOG_OBJECT (self, "valid UTF-8, no conversion needed");
return g_strndup (str, len);
}
GST_INFO_OBJECT (self, "invalid UTF-8!");
self->valid_utf8 = FALSE;
}
encoding = g_getenv ("GST_SUBTITLE_ENCODING");
if (encoding == NULL || *encoding == '\0') {
/* if local encoding is UTF-8 and no encoding specified
* via the environment variable, assume ISO-8859-15 */
if (g_get_charset (&encoding)) {
encoding = "ISO-8859-15";
}
}
ret = g_convert_with_fallback (str, len, "UTF-8", encoding, "*", NULL,
NULL, &err);
if (err) {
GST_WARNING_OBJECT (self, "could not convert string from '%s' to UTF-8: %s",
encoding, err->message);
g_error_free (err);
/* invalid input encoding, fall back to ISO-8859-15 (always succeeds) */
ret = g_convert_with_fallback (str, len, "UTF-8", "ISO-8859-15", "*",
NULL, NULL, NULL);
}
GST_LOG_OBJECT (self, "successfully converted %d characters from %s to UTF-8"
"%s", len, encoding, (err) ? " , using ISO-8859-15 as fallback" : "");
return ret;
}
static gchar *
get_next_line (GstSubParse * self)
{
char *line = NULL;
const char *line_end;
int line_len;
gboolean have_r = FALSE;
line_end = strchr (self->textbuf->str, '\n');
if (!line_end) {
/* end-of-line not found; return for more data */
return NULL;
}
/* get rid of '\r' */
if (line_end != self->textbuf->str && *(line_end - 1) == '\r') {
line_end--;
have_r = TRUE;
}
line_len = line_end - self->textbuf->str;
line = convert_encoding (self, self->textbuf->str, line_len);
self->textbuf = g_string_erase (self->textbuf, 0,
line_len + (have_r ? 2 : 1));
return line;
}
static gchar *
parse_mdvdsub (ParserState * state, const gchar * line)
{
const gchar *line_split;
gchar *line_chunk;
guint start_frame, end_frame;
gint64 clip_start = 0, clip_stop = 0;
gboolean in_seg = FALSE;
/* FIXME: hardcoded for now, but detecting the correct value is
* not going to be easy, I suspect... */
const double frames_per_sec = 24000 / 1001.;
GString *markup;
gchar *ret;
/* style variables */
gboolean italic;
gboolean bold;
guint fontsize;
if (sscanf (line, "{%u}{%u}", &start_frame, &end_frame) != 2) {
g_warning ("Parse of the following line, assumed to be in microdvd .sub"
" format, failed:\n%s", line);
return NULL;
}
state->start_time = (start_frame - 1000) / frames_per_sec * GST_SECOND;
state->duration = (end_frame - start_frame) / frames_per_sec * GST_SECOND;
/* Check our segment start/stop */
in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME,
state->start_time, state->start_time + state->duration, &clip_start,
&clip_stop);
/* No need to parse that text if it's out of segment */
if (in_seg) {
state->start_time = clip_start;
state->duration = clip_stop - clip_start;
} else {
return NULL;
}
/* skip the {%u}{%u} part */
line = strchr (line, '}') + 1;
line = strchr (line, '}') + 1;
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;
}
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));
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 = markup->str;
g_string_free (markup, FALSE);
GST_DEBUG ("parse_mdvdsub returning (%f+%f): %s",
state->start_time / (double) GST_SECOND,
state->duration / (double) GST_SECOND, ret);
return ret;
}
/* 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)
{
gchar *pos;
for (pos = txt; pos != NULL && *pos != '\0'; ++pos) {
if (g_ascii_strncasecmp (pos, "&lt;u&gt;", 9) == 0 ||
g_ascii_strncasecmp (pos, "&lt;i&gt;", 9) == 0 ||
g_ascii_strncasecmp (pos, "&lt;b&gt;", 9) == 0) {
pos[0] = '<';
pos[1] = g_ascii_tolower (pos[4]);
pos[2] = '>';
/* move NUL terminator as well */
g_memmove (pos + 3, pos + 9, strlen (pos + 9) + 1);
pos += 2;
}
}
for (pos = txt; pos != NULL && *pos != '\0'; ++pos) {
if (g_ascii_strncasecmp (pos, "&lt;/u&gt;", 10) == 0 ||
g_ascii_strncasecmp (pos, "&lt;/i&gt;", 10) == 0 ||
g_ascii_strncasecmp (pos, "&lt;/b&gt;", 10) == 0) {
pos[0] = '<';
pos[1] = '/';
pos[2] = g_ascii_tolower (pos[5]);
pos[3] = '>';
/* move NUL terminator as well */
g_memmove (pos + 4, pos + 10, strlen (pos + 10) + 1);
pos += 3;
}
}
}
static gchar *
parse_subrip (ParserState * state, const gchar * line)
{
guint h1, m1, s1, ms1;
guint h2, m2, s2, ms2;
int subnum;
gchar *ret;
switch (state->state) {
case 0:
/* looking for a single integer */
if (sscanf (line, "%u", &subnum) == 1)
state->state = 1;
return NULL;
case 1:
/* looking for start_time --> end_time */
if (sscanf (line, "%u:%u:%u,%u --> %u:%u:%u,%u",
&h1, &m1, &s1, &ms1, &h2, &m2, &s2, &ms2) == 8) {
state->state = 2;
state->start_time =
(((guint64) h1) * 3600 + m1 * 60 + s1) * GST_SECOND +
ms1 * GST_MSECOND;
state->duration =
(((guint64) h2) * 3600 + m2 * 60 + s2) * GST_SECOND +
ms2 * GST_MSECOND - state->start_time;
} else {
GST_DEBUG ("error parsing subrip time line");
state->state = 0;
}
return NULL;
case 2:
{ /* No need to parse that text if it's out of segment */
gint64 clip_start = 0, clip_stop = 0;
gboolean in_seg = FALSE;
/* Check our segment start/stop */
in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME,
state->start_time, state->start_time + state->duration,
&clip_start, &clip_stop);
if (in_seg) {
state->start_time = clip_start;
state->duration = clip_stop - clip_start;
} else {
state->state = 0;
return NULL;
}
}
/* looking for subtitle text; empty line ends this
* subtitle entry */
if (state->buf->len)
g_string_append_c (state->buf, '\n');
g_string_append (state->buf, line);
if (strlen (line) == 0) {
ret = g_markup_escape_text (state->buf->str, state->buf->len);
g_string_truncate (state->buf, 0);
state->state = 0;
subrip_unescape_formatting (ret);
return ret;
}
return NULL;
default:
g_return_val_if_reached (NULL);
}
}
static gchar *
parse_mpsub (ParserState * state, const gchar * line)
{
gchar *ret;
float t1, t2;
switch (state->state) {
case 0:
/* looking for two floats (offset, duration) */
if (sscanf (line, "%f %f", &t1, &t2) == 2) {
state->state = 1;
state->start_time += state->duration + GST_SECOND * t1;
state->duration = GST_SECOND * t2;
}
return NULL;
case 1:
{ /* No need to parse that text if it's out of segment */
gint64 clip_start = 0, clip_stop = 0;
gboolean in_seg = FALSE;
/* Check our segment start/stop */
in_seg = gst_segment_clip (state->segment, GST_FORMAT_TIME,
state->start_time, state->start_time + state->duration,
&clip_start, &clip_stop);
if (in_seg) {
state->start_time = clip_start;
state->duration = clip_stop - clip_start;
} else {
state->state = 0;
return NULL;
}
}
/* looking for subtitle text; empty line ends this
* subtitle entry */
if (state->buf->len)
g_string_append_c (state->buf, '\n');
g_string_append (state->buf, line);
if (strlen (line) == 0) {
ret = g_strdup (state->buf->str);
g_string_truncate (state->buf, 0);
state->state = 0;
return ret;
}
return NULL;
default:
g_assert_not_reached ();
return NULL;
}
}
static void
parser_state_init (ParserState * state)
{
GST_DEBUG ("initialising parser");
if (state->buf) {
g_string_truncate (state->buf, 0);
} else {
state->buf = g_string_new (NULL);
}
state->start_time = 0;
state->duration = 0;
state->state = 0;
state->segment = NULL;
}
static void
parser_state_dispose (ParserState * state)
{
if (state->buf) {
g_string_free (state->buf, TRUE);
state->buf = NULL;
}
}
/*
* FIXME: maybe we should pass along a second argument, the preceding
* text buffer, because that is how this originally worked, even though
* I don't really see the use of that.
*/
static GstSubParseFormat
gst_sub_parse_data_format_autodetect (gchar * match_str)
{
static gboolean need_init_regexps = TRUE;
static regex_t mdvd_rx;
static regex_t subrip_rx;
/* initialize the regexps used the first time around */
if (need_init_regexps) {
int err;
char errstr[128];
need_init_regexps = FALSE;
if ((err = regcomp (&mdvd_rx, "^\\{[0-9]+\\}\\{[0-9]+\\}",
REG_EXTENDED | REG_NEWLINE | REG_NOSUB) != 0) ||
(err = regcomp (&subrip_rx, "^1(\x0d)?\x0a"
"[0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9]{3}"
" --> [0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9]{3}",
REG_EXTENDED | REG_NEWLINE | REG_NOSUB)) != 0) {
regerror (err, &subrip_rx, errstr, 127);
GST_WARNING ("Compilation of subrip regex failed: %s", errstr);
}
}
if (regexec (&mdvd_rx, match_str, 0, NULL, 0) == 0) {
GST_LOG ("subparse: MicroDVD (frame based) format detected");
return GST_SUB_PARSE_FORMAT_MDVDSUB;
}
if (regexec (&subrip_rx, match_str, 0, NULL, 0) == 0) {
GST_LOG ("subparse: SubRip (time based) format detected");
return GST_SUB_PARSE_FORMAT_SUBRIP;
}
if (!strncmp (match_str, "FORMAT=TIME", 11)) {
GST_LOG ("subparse: MPSub (time based) format detected");
return GST_SUB_PARSE_FORMAT_MPSUB;
}
GST_WARNING ("subparse: subtitle format autodetection failed!");
return GST_SUB_PARSE_FORMAT_UNKNOWN;
}
static GstCaps *
gst_sub_parse_format_autodetect (GstSubParse * self)
{
gchar *data;
GstSubParseFormat format;
if (strlen (self->textbuf->str) < 35) {
GST_DEBUG ("File too small to be a subtitles file");
return NULL;
}
data = g_strndup (self->textbuf->str, 35);
format = gst_sub_parse_data_format_autodetect (data);
g_free (data);
self->parser_type = format;
parser_state_init (&self->state);
switch (format) {
case GST_SUB_PARSE_FORMAT_MDVDSUB:
self->parse_line = parse_mdvdsub;
return gst_caps_new_simple ("text/x-pango-markup", NULL);
case GST_SUB_PARSE_FORMAT_SUBRIP:
self->parse_line = parse_subrip;
return gst_caps_new_simple ("text/x-pango-markup", NULL);
case GST_SUB_PARSE_FORMAT_MPSUB:
self->parse_line = parse_mpsub;
return gst_caps_new_simple ("text/plain", NULL);
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)
{
if (GST_BUFFER_OFFSET (buf) != self->offset) {
/* flush the parser state */
parser_state_init (&self->state);
g_string_truncate (self->textbuf, 0);
}
self->textbuf = g_string_append_len (self->textbuf,
(gchar *) GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
self->offset = GST_BUFFER_OFFSET (buf) + GST_BUFFER_SIZE (buf);
self->next_offset = self->offset;
gst_buffer_unref (buf);
}
static GstFlowReturn
handle_buffer (GstSubParse * self, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstCaps *caps = NULL;
gchar *line, *subtitle;
feed_textbuf (self, buf);
/* make sure we know the format */
if (G_UNLIKELY (self->parser_type == GST_SUB_PARSE_FORMAT_UNKNOWN)) {
if (!(caps = gst_sub_parse_format_autodetect (self))) {
return GST_FLOW_UNEXPECTED;
}
if (!gst_pad_set_caps (self->srcpad, caps)) {
gst_caps_unref (caps);
return GST_FLOW_UNEXPECTED;
}
gst_caps_unref (caps);
}
while ((line = get_next_line (self)) && !self->flushing) {
/* Set segment on our parser state machine */
self->state.segment = self->segment;
/* Now parse the line, out of segment lines will just return NULL */
GST_DEBUG ("Parsing line '%s'", line);
subtitle = self->parse_line (&self->state, line);
g_free (line);
if (subtitle) {
guint subtitle_len = strlen (subtitle);
ret = gst_pad_alloc_buffer_and_set_caps (self->srcpad,
GST_BUFFER_OFFSET_NONE, subtitle_len,
GST_PAD_CAPS (self->srcpad), &buf);
if (ret == GST_FLOW_OK) {
memcpy (GST_BUFFER_DATA (buf), subtitle, subtitle_len);
GST_BUFFER_TIMESTAMP (buf) = self->state.start_time;
GST_BUFFER_DURATION (buf) = self->state.duration;
gst_segment_set_last_stop (self->segment, GST_FORMAT_TIME,
self->state.start_time);
GST_DEBUG ("Sending text '%s', %" GST_TIME_FORMAT " + %"
GST_TIME_FORMAT, subtitle, GST_TIME_ARGS (self->state.start_time),
GST_TIME_ARGS (self->state.duration));
ret = gst_pad_push (self->srcpad, buf);
}
g_free (subtitle);
subtitle = NULL;
if (GST_FLOW_IS_FATAL (ret))
break;
}
}
return ret;
}
static GstFlowReturn
gst_sub_parse_chain (GstPad * sinkpad, GstBuffer * buf)
{
GstFlowReturn ret;
GstSubParse *self;
GST_DEBUG ("gst_sub_parse_chain");
self = GST_SUBPARSE (gst_pad_get_parent (sinkpad));
/* Push newsegment if needed */
if (self->need_segment) {
gst_pad_push_event (self->srcpad, gst_event_new_new_segment (FALSE,
self->segment->rate, self->segment->format,
self->segment->last_stop, self->segment->stop,
self->segment->time));
self->need_segment = FALSE;
}
ret = handle_buffer (self, buf);
gst_object_unref (self);
return ret;
}
static gboolean
gst_sub_parse_sink_event (GstPad * pad, GstEvent * event)
{
GstSubParse *self = GST_SUBPARSE (gst_pad_get_parent (pad));
gboolean ret = FALSE;
GST_DEBUG ("Handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:{
/* Make sure the last subrip chunk is pushed out even
* if the file does not have an empty line at the end */
if (self->parser_type == GST_SUB_PARSE_FORMAT_SUBRIP) {
GstBuffer *buf = gst_buffer_new_and_alloc (1 + 1);
GST_DEBUG ("EOS. Pushing remaining text (if any)");
GST_BUFFER_DATA (buf)[0] = '\n';
GST_BUFFER_DATA (buf)[1] = '\0'; /* play it safe */
GST_BUFFER_SIZE (buf) = 1;
GST_BUFFER_OFFSET (buf) = self->offset;
gst_sub_parse_chain (pad, buf);
}
ret = gst_pad_event_default (pad, event);
break;
}
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate;
gint64 start, stop, time;
gboolean update;
GST_DEBUG_OBJECT (self, "received new segment");
gst_event_parse_new_segment (event, &update, &rate, &format, &start,
&stop, &time);
/* now copy over the values */
gst_segment_set_newsegment (self->segment, update, rate, format,
start, stop, time);
ret = TRUE;
gst_event_unref (event);
break;
}
case GST_EVENT_FLUSH_START:
{
self->flushing = TRUE;
ret = gst_pad_event_default (pad, event);
break;
}
case GST_EVENT_FLUSH_STOP:
{
self->flushing = FALSE;
ret = gst_pad_event_default (pad, event);
break;
}
default:
ret = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (self);
return ret;
}
static GstStateChangeReturn
gst_sub_parse_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstSubParse *self = GST_SUBPARSE (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* format detection will init the parser state */
self->offset = self->next_offset = 0;
self->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN;
self->valid_utf8 = TRUE;
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
parser_state_dispose (&self->state);
self->parser_type = GST_SUB_PARSE_FORMAT_UNKNOWN;
break;
default:
break;
}
return ret;
}
/*
* Typefind support.
*/
static GstStaticCaps sub_caps = GST_STATIC_CAPS ("application/x-subtitle");
#define SUB_CAPS (gst_static_caps_get (&sub_caps))
static void
gst_subparse_type_find (GstTypeFind * tf, gpointer private)
{
const guint8 *data;
GstSubParseFormat format;
gchar *str;
if (!(data = gst_type_find_peek (tf, 0, 36)))
return;
/* make sure string passed to _autodetect() is NUL-terminated */
str = g_strndup ((gchar *) data, 35);
format = gst_sub_parse_data_format_autodetect (str);
g_free (str);
switch (format) {
case GST_SUB_PARSE_FORMAT_MDVDSUB:
GST_DEBUG ("MicroDVD format detected");
break;
case GST_SUB_PARSE_FORMAT_SUBRIP:
GST_DEBUG ("SubRip format detected");
break;
case GST_SUB_PARSE_FORMAT_MPSUB:
GST_DEBUG ("MPSub format detected");
break;
case GST_SUB_PARSE_FORMAT_UNKNOWN:
GST_DEBUG ("no subtitle format detected");
return;
}
/* if we're here, it's ok */
gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, SUB_CAPS);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
static gchar *sub_exts[] = { "srt", "sub", "mpsub", "mdvd", NULL };
GST_DEBUG_CATEGORY_INIT (sub_parse_debug, "subparse", 0, ".sub parser");
if (!gst_type_find_register (plugin, "subparse_typefind", GST_RANK_MARGINAL,
gst_subparse_type_find, sub_exts, SUB_CAPS, NULL, NULL))
return FALSE;
if (!gst_element_register (plugin, "subparse",
GST_RANK_PRIMARY, GST_TYPE_SUBPARSE) ||
!gst_element_register (plugin, "ssaparse",
GST_RANK_PRIMARY, GST_TYPE_SSA_PARSE)) {
return FALSE;
}
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"subparse",
"Subtitle parsing",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)