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gstreamer/subprojects/gst-plugins-base/gst/playback/gstsubtitleoverlay.c
Edward Hervey 87bb3a8e2e subtitleoverlay: Handle video sink pad CAPS query earlier 
The internal elements are only created when caps on both video and subtitle pads
are known.

Prior to that, a GST_QUERY_CAPS on a video sink pad would just return ANY
instead of giving a hint of what downstream can actually handle and
prefers. This could result in upstream elements (such as decoders) deciding on
chosing (in the best cases) a non-optimal caps or (in the worst case) caps that
couldn't be handled by the elements downstream of subtitleoverlay.

In order to fix that, we assume that all subtitle "elements" handle the subtitle
overlay composition feature/meta and handle `GST_QUERY_CAPS` ourselves if the
internal elements aren't present yet.

Fixes #3176

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5834>
2024-01-26 08:36:07 +00:00

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/*
* Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*/
/**
* SECTION:element-subtitleoverlay
* @title: subtitleoverlay
*
* #GstBin that auto-magically overlays a video stream with subtitles by
* autoplugging the required elements.
*
* It supports raw, timestamped text, different textual subtitle formats and
* DVD subpicture subtitles.
*
* ## Examples
* |[
* gst-launch-1.0 -v filesrc location=test.mkv ! matroskademux name=demux ! video/x-h264 ! queue ! decodebin ! subtitleoverlay name=overlay ! videoconvert ! autovideosink demux. ! subpicture/x-dvd ! queue ! overlay.
* ]|
* This will play back the given Matroska file with h264 video and dvd subpicture style subtitles.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstplaybackelements.h"
#include "gstsubtitleoverlay.h"
#include <gst/pbutils/missing-plugins.h>
#include <gst/video/video.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (subtitle_overlay_debug);
#define GST_CAT_DEFAULT subtitle_overlay_debug
#define IS_SUBTITLE_CHAIN_IGNORE_ERROR(flow) \
G_UNLIKELY (flow == GST_FLOW_ERROR || flow == GST_FLOW_NOT_NEGOTIATED)
#define IS_VIDEO_CHAIN_IGNORE_ERROR(flow) \
G_UNLIKELY (flow == GST_FLOW_ERROR)
/* We have colorspace conversions so we can accept any known video formats */
#define SUBTITLE_OVERLAY_CAPS GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL)
static GstStaticCaps sw_template_caps = GST_STATIC_CAPS (SUBTITLE_OVERLAY_CAPS);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate video_sinktemplate =
GST_STATIC_PAD_TEMPLATE ("video_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate subtitle_sinktemplate =
GST_STATIC_PAD_TEMPLATE ("subtitle_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
enum
{
PROP_0,
PROP_SILENT,
PROP_FONT_DESC,
PROP_SUBTITLE_ENCODING,
PROP_SUBTITLE_TS_OFFSET
};
#define gst_subtitle_overlay_parent_class parent_class
G_DEFINE_TYPE (GstSubtitleOverlay, gst_subtitle_overlay, GST_TYPE_BIN);
static GQuark _subtitle_overlay_event_marker_id = 0;
#define _do_init \
GST_DEBUG_CATEGORY_INIT (subtitle_overlay_debug, "subtitleoverlay", 0, "Subtitle Overlay"); \
playback_element_init (plugin); \
_subtitle_overlay_event_marker_id = g_quark_from_static_string ("gst-subtitle-overlay-event-marker")
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (subtitleoverlay, "subtitleoverlay",
GST_RANK_NONE, GST_TYPE_SUBTITLE_OVERLAY, _do_init);
static void
do_async_start (GstSubtitleOverlay * self)
{
if (!self->do_async) {
GstMessage *msg = gst_message_new_async_start (GST_OBJECT_CAST (self));
GST_DEBUG_OBJECT (self, "Posting async-start");
GST_BIN_CLASS (parent_class)->handle_message (GST_BIN_CAST (self), msg);
self->do_async = TRUE;
}
}
static void
do_async_done (GstSubtitleOverlay * self)
{
if (self->do_async) {
GstMessage *msg = gst_message_new_async_done (GST_OBJECT_CAST (self),
GST_CLOCK_TIME_NONE);
GST_DEBUG_OBJECT (self, "Posting async-done");
GST_BIN_CLASS (parent_class)->handle_message (GST_BIN_CAST (self), msg);
self->do_async = FALSE;
}
}
static GstPadProbeReturn
_pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data);
static void
block_video (GstSubtitleOverlay * self)
{
if (self->video_block_id != 0)
return;
if (self->video_block_pad) {
self->video_block_id =
gst_pad_add_probe (self->video_block_pad,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM, _pad_blocked_cb, self, NULL);
}
}
static void
unblock_video (GstSubtitleOverlay * self)
{
if (self->video_block_id) {
gst_pad_remove_probe (self->video_block_pad, self->video_block_id);
self->video_sink_blocked = FALSE;
self->video_block_id = 0;
}
}
static void
block_subtitle (GstSubtitleOverlay * self)
{
if (self->subtitle_block_id != 0)
return;
if (self->subtitle_block_pad) {
self->subtitle_block_id =
gst_pad_add_probe (self->subtitle_block_pad,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM, _pad_blocked_cb, self, NULL);
}
}
static void
unblock_subtitle (GstSubtitleOverlay * self)
{
if (self->subtitle_block_id) {
gst_pad_remove_probe (self->subtitle_block_pad, self->subtitle_block_id);
self->subtitle_sink_blocked = FALSE;
self->subtitle_block_id = 0;
}
}
static gboolean
pad_supports_caps (GstPad * pad, GstCaps * caps)
{
GstCaps *pad_caps;
gboolean ret = FALSE;
pad_caps = gst_pad_query_caps (pad, NULL);
if (gst_caps_is_subset (caps, pad_caps))
ret = TRUE;
gst_caps_unref (pad_caps);
return ret;
}
static void
gst_subtitle_overlay_finalize (GObject * object)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (object);
g_mutex_clear (&self->lock);
g_mutex_clear (&self->factories_lock);
if (self->factories)
gst_plugin_feature_list_free (self->factories);
self->factories = NULL;
gst_caps_replace (&self->factory_caps, NULL);
if (self->font_desc) {
g_free (self->font_desc);
self->font_desc = NULL;
}
if (self->encoding) {
g_free (self->encoding);
self->encoding = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
_is_renderer (GstElementFactory * factory)
{
const gchar *klass, *name;
klass =
gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
name = gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
if (klass != NULL) {
if (strstr (klass, "Overlay/Subtitle") != NULL ||
strstr (klass, "Overlay/SubPicture") != NULL)
return TRUE;
if (strcmp (name, "textoverlay") == 0)
return TRUE;
}
return FALSE;
}
static gboolean
_is_parser (GstElementFactory * factory)
{
const gchar *klass;
klass =
gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
if (klass != NULL && strstr (klass, "Parser/Subtitle") != NULL)
return TRUE;
return FALSE;
}
static const gchar *const _sub_pad_names[] = { "subpicture", "subpicture_sink",
"text", "text_sink",
"subtitle_sink", "subtitle", "cc_sink"
};
static gboolean
_is_video_pad (GstPad * pad, gboolean * hw_accelerated)
{
GstPad *peer = gst_pad_get_peer (pad);
GstCaps *caps;
gboolean ret = FALSE;
const gchar *name;
guint i;
if (peer) {
caps = gst_pad_get_current_caps (peer);
if (!caps) {
caps = gst_pad_query_caps (peer, NULL);
}
gst_object_unref (peer);
} else {
caps = gst_pad_query_caps (pad, NULL);
}
for (i = 0; i < gst_caps_get_size (caps) && !ret; i++) {
name = gst_structure_get_name (gst_caps_get_structure (caps, i));
if (g_str_equal (name, "video/x-raw")) {
ret = TRUE;
if (hw_accelerated)
*hw_accelerated = FALSE;
} else if (g_str_has_prefix (name, "video/x-surface")) {
ret = TRUE;
if (hw_accelerated)
*hw_accelerated = TRUE;
} else {
ret = FALSE;
if (hw_accelerated)
*hw_accelerated = FALSE;
}
}
gst_caps_unref (caps);
return ret;
}
static GstCaps *
_get_sub_caps (GstElementFactory * factory)
{
const GList *templates;
GList *walk;
gboolean is_parser = _is_parser (factory);
templates = gst_element_factory_get_static_pad_templates (factory);
for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
GstStaticPadTemplate *templ = walk->data;
if (templ->direction == GST_PAD_SINK && templ->presence == GST_PAD_ALWAYS) {
gboolean found = FALSE;
if (is_parser) {
found = TRUE;
} else {
guint i;
for (i = 0; i < G_N_ELEMENTS (_sub_pad_names); i++) {
if (strcmp (templ->name_template, _sub_pad_names[i]) == 0) {
found = TRUE;
break;
}
}
}
if (found)
return gst_static_caps_get (&templ->static_caps);
}
}
return NULL;
}
static gboolean
_factory_filter (GstPluginFeature * feature, GstCaps ** subcaps)
{
GstElementFactory *factory;
guint rank;
const gchar *name;
const GList *templates;
GList *walk;
gboolean is_renderer;
GstCaps *templ_caps = NULL;
gboolean have_video_sink = FALSE;
/* we only care about element factories */
if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
factory = GST_ELEMENT_FACTORY_CAST (feature);
/* only select elements with autoplugging rank or textoverlay */
name = gst_plugin_feature_get_name (feature);
rank = gst_plugin_feature_get_rank (feature);
if (strcmp ("textoverlay", name) != 0 && rank < GST_RANK_MARGINAL)
return FALSE;
/* Check if it's a renderer or a parser */
if (_is_renderer (factory)) {
is_renderer = TRUE;
} else if (_is_parser (factory)) {
is_renderer = FALSE;
} else {
return FALSE;
}
/* Check if there's a video sink in case of a renderer */
if (is_renderer) {
templates = gst_element_factory_get_static_pad_templates (factory);
for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
GstStaticPadTemplate *templ = walk->data;
/* we only care about the always-sink templates */
if (templ->direction == GST_PAD_SINK && templ->presence == GST_PAD_ALWAYS) {
if (strcmp (templ->name_template, "video") == 0 ||
strcmp (templ->name_template, "video_sink") == 0) {
have_video_sink = TRUE;
}
}
}
}
templ_caps = _get_sub_caps (factory);
if (is_renderer && have_video_sink && templ_caps) {
GST_DEBUG ("Found renderer element %s (%s) with caps %" GST_PTR_FORMAT,
gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_LONGNAME),
gst_plugin_feature_get_name (feature), templ_caps);
*subcaps = gst_caps_merge (*subcaps, templ_caps);
return TRUE;
} else if (!is_renderer && !have_video_sink && templ_caps) {
GST_DEBUG ("Found parser element %s (%s) with caps %" GST_PTR_FORMAT,
gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_LONGNAME),
gst_plugin_feature_get_name (feature), templ_caps);
*subcaps = gst_caps_merge (*subcaps, templ_caps);
return TRUE;
} else {
if (templ_caps)
gst_caps_unref (templ_caps);
return FALSE;
}
}
/* Call with factories_lock! */
static gboolean
gst_subtitle_overlay_update_factory_list (GstSubtitleOverlay * self)
{
GstRegistry *registry;
guint cookie;
registry = gst_registry_get ();
cookie = gst_registry_get_feature_list_cookie (registry);
if (!self->factories || self->factories_cookie != cookie) {
GstCaps *subcaps;
GList *factories;
subcaps = gst_caps_new_empty ();
factories = gst_registry_feature_filter (registry,
(GstPluginFeatureFilter) _factory_filter, FALSE, &subcaps);
GST_DEBUG_OBJECT (self, "Created factory caps: %" GST_PTR_FORMAT, subcaps);
gst_caps_replace (&self->factory_caps, subcaps);
gst_caps_unref (subcaps);
if (self->factories)
gst_plugin_feature_list_free (self->factories);
self->factories = factories;
self->factories_cookie = cookie;
}
return (self->factories != NULL);
}
G_LOCK_DEFINE_STATIC (_factory_caps);
static GstCaps *_factory_caps = NULL;
static guint32 _factory_caps_cookie = 0;
GstCaps *
gst_subtitle_overlay_create_factory_caps (void)
{
GstRegistry *registry;
GList *factories;
GstCaps *subcaps = NULL;
guint cookie;
registry = gst_registry_get ();
cookie = gst_registry_get_feature_list_cookie (registry);
G_LOCK (_factory_caps);
if (!_factory_caps || _factory_caps_cookie != cookie) {
if (_factory_caps)
gst_caps_unref (_factory_caps);
_factory_caps = gst_caps_new_empty ();
/* The caps is cached */
GST_MINI_OBJECT_FLAG_SET (_factory_caps,
GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
factories = gst_registry_feature_filter (registry,
(GstPluginFeatureFilter) _factory_filter, FALSE, &_factory_caps);
GST_DEBUG ("Created factory caps: %" GST_PTR_FORMAT, _factory_caps);
gst_plugin_feature_list_free (factories);
_factory_caps_cookie = cookie;
}
subcaps = gst_caps_ref (_factory_caps);
G_UNLOCK (_factory_caps);
return subcaps;
}
static gboolean
check_factory_for_caps (GstElementFactory * factory, const GstCaps * caps)
{
GstCaps *fcaps = _get_sub_caps (factory);
gboolean ret = (fcaps) ? gst_caps_is_subset (caps, fcaps) : FALSE;
if (fcaps)
gst_caps_unref (fcaps);
if (ret)
gst_object_ref (factory);
return ret;
}
static GList *
gst_subtitle_overlay_get_factories_for_caps (const GList * list,
const GstCaps * caps)
{
const GList *walk = list;
GList *result = NULL;
while (walk) {
GstElementFactory *factory = walk->data;
walk = g_list_next (walk);
if (check_factory_for_caps (factory, caps)) {
result = g_list_prepend (result, factory);
}
}
return result;
}
static gint
_sort_by_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
{
gint diff;
const gchar *rname1, *rname2;
diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
if (diff != 0)
return diff;
/* If the ranks are the same sort by name to get deterministic results */
rname1 = gst_plugin_feature_get_name (f1);
rname2 = gst_plugin_feature_get_name (f2);
diff = strcmp (rname1, rname2);
return diff;
}
static GstPad *
_get_sub_pad (GstElement * element)
{
GstPad *pad;
guint i;
for (i = 0; i < G_N_ELEMENTS (_sub_pad_names); i++) {
pad = gst_element_get_static_pad (element, _sub_pad_names[i]);
if (pad)
return pad;
}
return NULL;
}
static GstPad *
_get_video_pad (GstElement * element)
{
static const gchar *const pad_names[] = { "video", "video_sink" };
GstPad *pad;
guint i;
for (i = 0; i < G_N_ELEMENTS (pad_names); i++) {
pad = gst_element_get_static_pad (element, pad_names[i]);
if (pad)
return pad;
}
return NULL;
}
static gboolean
_create_element (GstSubtitleOverlay * self, GstElement ** element,
const gchar * factory_name, GstElementFactory * factory,
const gchar * element_name, gboolean mandatory)
{
GstElement *elt;
g_assert (!factory || !factory_name);
if (factory_name) {
elt = gst_element_factory_make (factory_name, element_name);
} else {
factory_name =
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
elt = gst_element_factory_create (factory, element_name);
}
if (G_UNLIKELY (!elt)) {
if (!factory) {
GstMessage *msg;
msg =
gst_missing_element_message_new (GST_ELEMENT_CAST (self),
factory_name);
gst_element_post_message (GST_ELEMENT_CAST (self), msg);
if (mandatory)
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, (NULL),
("no '%s' plugin found", factory_name));
else
GST_ELEMENT_WARNING (self, CORE, MISSING_PLUGIN, (NULL),
("no '%s' plugin found", factory_name));
} else {
if (mandatory) {
GST_ELEMENT_ERROR (self, CORE, FAILED, (NULL),
("can't instantiate '%s'", factory_name));
} else {
GST_ELEMENT_WARNING (self, CORE, FAILED, (NULL),
("can't instantiate '%s'", factory_name));
}
}
return FALSE;
}
if (G_UNLIKELY (gst_element_set_state (elt,
GST_STATE_READY) != GST_STATE_CHANGE_SUCCESS)) {
gst_object_unref (elt);
if (mandatory) {
GST_ELEMENT_ERROR (self, CORE, STATE_CHANGE, (NULL),
("failed to set '%s' to READY", factory_name));
} else {
GST_WARNING_OBJECT (self, "Failed to set '%s' to READY", factory_name);
}
return FALSE;
}
if (G_UNLIKELY (!gst_bin_add (GST_BIN_CAST (self), gst_object_ref (elt)))) {
gst_element_set_state (elt, GST_STATE_NULL);
gst_object_unref (elt);
if (mandatory) {
GST_ELEMENT_ERROR (self, CORE, FAILED, (NULL),
("failed to add '%s' to subtitleoverlay", factory_name));
} else {
GST_WARNING_OBJECT (self, "Failed to add '%s' to subtitleoverlay",
factory_name);
}
return FALSE;
}
gst_element_sync_state_with_parent (elt);
*element = elt;
return TRUE;
}
static void
_remove_element (GstSubtitleOverlay * self, GstElement ** element)
{
if (*element) {
gst_bin_remove (GST_BIN_CAST (self), *element);
gst_element_set_state (*element, GST_STATE_NULL);
gst_object_unref (*element);
*element = NULL;
}
}
static gboolean
_setup_passthrough (GstSubtitleOverlay * self)
{
GstPad *src, *sink;
GstElement *identity;
GST_DEBUG_OBJECT (self, "Doing video passthrough");
if (self->passthrough_identity) {
GST_DEBUG_OBJECT (self, "Already in passthrough mode");
goto out;
}
/* Unlink & destroy everything */
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->video_sinkpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad), NULL);
self->silent_property = NULL;
_remove_element (self, &self->post_colorspace);
_remove_element (self, &self->overlay);
_remove_element (self, &self->parser);
_remove_element (self, &self->renderer);
_remove_element (self, &self->pre_colorspace);
_remove_element (self, &self->passthrough_identity);
if (G_UNLIKELY (!_create_element (self, &self->passthrough_identity,
"identity", NULL, "passthrough-identity", TRUE))) {
return FALSE;
}
identity = self->passthrough_identity;
g_object_set (G_OBJECT (identity), "silent", TRUE, "signal-handoffs", FALSE,
NULL);
/* Set src ghostpad target */
src = gst_element_get_static_pad (self->passthrough_identity, "src");
if (G_UNLIKELY (!src)) {
GST_ELEMENT_ERROR (self, CORE, PAD, (NULL),
("Failed to get srcpad from identity"));
return FALSE;
}
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad),
src))) {
GST_ELEMENT_ERROR (self, CORE, PAD, (NULL),
("Failed to set srcpad target"));
gst_object_unref (src);
return FALSE;
}
gst_object_unref (src);
sink = gst_element_get_static_pad (self->passthrough_identity, "sink");
if (G_UNLIKELY (!sink)) {
GST_ELEMENT_ERROR (self, CORE, PAD, (NULL),
("Failed to get sinkpad from identity"));
return FALSE;
}
/* Link sink ghostpads to identity */
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->video_sinkpad), sink))) {
GST_ELEMENT_ERROR (self, CORE, PAD, (NULL),
("Failed to set video sinkpad target"));
gst_object_unref (sink);
return FALSE;
}
gst_object_unref (sink);
GST_DEBUG_OBJECT (self, "Video passthrough setup successfully");
out:
/* Unblock pads */
unblock_video (self);
unblock_subtitle (self);
return TRUE;
}
/* Must be called with subtitleoverlay lock! */
static gboolean
_has_property_with_type (GObject * object, const gchar * property, GType type)
{
GObjectClass *gobject_class;
GParamSpec *pspec;
gobject_class = G_OBJECT_GET_CLASS (object);
pspec = g_object_class_find_property (gobject_class, property);
return (pspec && pspec->value_type == type);
}
static void
gst_subtitle_overlay_set_fps (GstSubtitleOverlay * self)
{
if (!self->parser || self->fps_d == 0)
return;
if (!_has_property_with_type (G_OBJECT (self->parser), "video-fps",
GST_TYPE_FRACTION))
return;
GST_DEBUG_OBJECT (self, "Updating video-fps property in parser");
g_object_set (self->parser, "video-fps", self->fps_n, self->fps_d, NULL);
}
static void
_update_subtitle_offset (GstSubtitleOverlay * self)
{
if (self->parser) {
GstPad *srcpad = gst_element_get_static_pad (self->parser, "src");
GST_DEBUG_OBJECT (self, "setting subtitle offset to %" G_GINT64_FORMAT,
self->subtitle_ts_offset);
gst_pad_set_offset (srcpad, -self->subtitle_ts_offset);
gst_object_unref (srcpad);
} else {
GST_LOG_OBJECT (self, "no parser, subtitle offset can't be updated");
}
}
static const gchar *
_get_silent_property (GstElement * element, gboolean * invert)
{
static const struct
{
const gchar *name;
gboolean invert;
} properties[] = { {
"silent", FALSE}, {
"enable", TRUE}
};
guint i;
for (i = 0; i < G_N_ELEMENTS (properties); i++) {
if (_has_property_with_type (G_OBJECT (element), properties[i].name,
G_TYPE_BOOLEAN)) {
*invert = properties[i].invert;
return properties[i].name;
}
}
return NULL;
}
static gboolean
_setup_parser (GstSubtitleOverlay * self)
{
GstPad *video_peer;
/* Try to get the latest video framerate */
video_peer = gst_pad_get_peer (self->video_sinkpad);
if (video_peer) {
GstCaps *video_caps;
gint fps_n, fps_d;
video_caps = gst_pad_get_current_caps (video_peer);
if (!video_caps) {
video_caps = gst_pad_query_caps (video_peer, NULL);
if (!gst_caps_is_fixed (video_caps)) {
gst_caps_unref (video_caps);
video_caps = NULL;
}
}
if (video_caps) {
GstStructure *st = gst_caps_get_structure (video_caps, 0);
if (gst_structure_get_fraction (st, "framerate", &fps_n, &fps_d)) {
GST_DEBUG_OBJECT (self, "New video fps: %d/%d", fps_n, fps_d);
self->fps_n = fps_n;
self->fps_d = fps_d;
}
}
if (video_caps)
gst_caps_unref (video_caps);
gst_object_unref (video_peer);
}
if (_has_property_with_type (G_OBJECT (self->parser), "subtitle-encoding",
G_TYPE_STRING))
g_object_set (self->parser, "subtitle-encoding", self->encoding, NULL);
/* Try to set video fps on the parser */
gst_subtitle_overlay_set_fps (self);
return TRUE;
}
static gboolean
_setup_renderer (GstSubtitleOverlay * self, GstElement * renderer)
{
GstElementFactory *factory = gst_element_get_factory (renderer);
const gchar *name =
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
if (strcmp (name, "textoverlay") == 0) {
/* Set some textoverlay specific properties */
gst_util_set_object_arg (G_OBJECT (renderer), "halignment", "center");
gst_util_set_object_arg (G_OBJECT (renderer), "valignment", "bottom");
g_object_set (G_OBJECT (renderer), "wait-text", FALSE, NULL);
if (self->font_desc)
g_object_set (G_OBJECT (renderer), "font-desc", self->font_desc, NULL);
self->silent_property = "silent";
self->silent_property_invert = FALSE;
} else {
self->silent_property =
_get_silent_property (renderer, &self->silent_property_invert);
if (_has_property_with_type (G_OBJECT (renderer), "subtitle-encoding",
G_TYPE_STRING))
g_object_set (renderer, "subtitle-encoding", self->encoding, NULL);
if (_has_property_with_type (G_OBJECT (renderer), "font-desc",
G_TYPE_STRING))
g_object_set (renderer, "font-desc", self->font_desc, NULL);
}
return TRUE;
}
/* subtitle_src==NULL means: use subtitle_sink ghostpad */
static gboolean
_link_renderer (GstSubtitleOverlay * self, GstElement * renderer,
GstPad * subtitle_src)
{
GstPad *sink, *src;
gboolean is_video, is_hw;
is_video = _is_video_pad (self->video_sinkpad, &is_hw);
if (is_video) {
gboolean render_is_hw;
/* First check that renderer also supports the video format */
sink = _get_video_pad (renderer);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
return FALSE;
}
if (is_video != _is_video_pad (sink, &render_is_hw) ||
is_hw != render_is_hw) {
GST_DEBUG_OBJECT (self, "Renderer doesn't support %s video",
is_hw ? "surface" : "raw");
gst_object_unref (sink);
return FALSE;
}
gst_object_unref (sink);
if (!is_hw) {
/* First link everything internally */
if (G_UNLIKELY (!_create_element (self, &self->post_colorspace,
COLORSPACE, NULL, "post-colorspace", FALSE))) {
return FALSE;
}
src = gst_element_get_static_pad (renderer, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
return FALSE;
}
sink = gst_element_get_static_pad (self->post_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from " COLORSPACE);
gst_object_unref (src);
return FALSE;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link renderer with " COLORSPACE);
gst_object_unref (src);
gst_object_unref (sink);
return FALSE;
}
gst_object_unref (src);
gst_object_unref (sink);
if (G_UNLIKELY (!_create_element (self, &self->pre_colorspace,
COLORSPACE, NULL, "pre-colorspace", FALSE))) {
return FALSE;
}
sink = _get_video_pad (renderer);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
return FALSE;
}
src = gst_element_get_static_pad (self->pre_colorspace, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get srcpad from " COLORSPACE);
gst_object_unref (sink);
return FALSE;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link " COLORSPACE " to renderer");
gst_object_unref (src);
gst_object_unref (sink);
return FALSE;
}
gst_object_unref (src);
gst_object_unref (sink);
/* Set src ghostpad target */
src = gst_element_get_static_pad (self->post_colorspace, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from " COLORSPACE);
return FALSE;
}
} else {
/* Set src ghostpad target in the hardware accelerated case */
src = gst_element_get_static_pad (renderer, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
return FALSE;
}
}
} else { /* No video pad */
GstCaps *allowed_caps, *video_caps = NULL;
GstPad *video_peer;
gboolean is_subset = FALSE;
video_peer = gst_pad_get_peer (self->video_sinkpad);
if (video_peer) {
video_caps = gst_pad_get_current_caps (video_peer);
if (!video_caps) {
video_caps = gst_pad_query_caps (video_peer, NULL);
}
gst_object_unref (video_peer);
}
sink = _get_video_pad (renderer);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
if (video_caps)
gst_caps_unref (video_caps);
return FALSE;
}
allowed_caps = gst_pad_query_caps (sink, NULL);
gst_object_unref (sink);
if (allowed_caps && video_caps)
is_subset = gst_caps_is_subset (video_caps, allowed_caps);
if (allowed_caps)
gst_caps_unref (allowed_caps);
if (video_caps)
gst_caps_unref (video_caps);
if (G_UNLIKELY (!is_subset)) {
GST_WARNING_OBJECT (self, "Renderer with custom caps is not "
"compatible with video stream");
return FALSE;
}
src = gst_element_get_static_pad (renderer, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
return FALSE;
}
}
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->srcpad), src))) {
GST_WARNING_OBJECT (self, "Can't set srcpad target");
gst_object_unref (src);
return FALSE;
}
gst_object_unref (src);
/* Set the sink ghostpad targets */
if (self->pre_colorspace) {
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from " COLORSPACE);
return FALSE;
}
} else {
sink = _get_video_pad (renderer);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from %" GST_PTR_FORMAT,
renderer);
return FALSE;
}
}
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->video_sinkpad), sink))) {
GST_WARNING_OBJECT (self, "Can't set video sinkpad target");
gst_object_unref (sink);
return FALSE;
}
gst_object_unref (sink);
sink = _get_sub_pad (renderer);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Failed to get subpad");
return FALSE;
}
if (subtitle_src) {
if (G_UNLIKELY (gst_pad_link (subtitle_src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Failed to link subtitle srcpad with renderer");
gst_object_unref (sink);
return FALSE;
}
} else {
if (G_UNLIKELY (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->subtitle_sinkpad), sink))) {
GST_WARNING_OBJECT (self, "Failed to set subtitle sink target");
gst_object_unref (sink);
return FALSE;
}
}
gst_object_unref (sink);
return TRUE;
}
static GstPadProbeReturn
_pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY_CAST (user_data);
GstCaps *subcaps;
GList *l, *factories = NULL;
if (GST_IS_EVENT (info->data)) {
if (!GST_EVENT_IS_SERIALIZED (info->data)) {
GST_DEBUG_OBJECT (pad, "Letting non-serialized event %s pass",
GST_EVENT_TYPE_NAME (info->data));
return GST_PAD_PROBE_PASS;
}
if (GST_EVENT_TYPE (info->data) == GST_EVENT_STREAM_START) {
GST_DEBUG_OBJECT (pad, "Letting event %s pass",
GST_EVENT_TYPE_NAME (info->data));
return GST_PAD_PROBE_PASS;
}
}
GST_DEBUG_OBJECT (pad, "Pad blocked");
GST_SUBTITLE_OVERLAY_LOCK (self);
if (pad == self->video_block_pad)
self->video_sink_blocked = TRUE;
else if (pad == self->subtitle_block_pad)
self->subtitle_sink_blocked = TRUE;
/* Now either both or the video sink are blocked */
/* Get current subtitle caps */
subcaps = self->subcaps;
if (!subcaps) {
GstPad *peer;
peer = gst_pad_get_peer (self->subtitle_sinkpad);
if (peer) {
subcaps = gst_pad_get_current_caps (peer);
if (!subcaps) {
subcaps = gst_pad_query_caps (peer, NULL);
if (!gst_caps_is_fixed (subcaps)) {
gst_caps_unref (subcaps);
subcaps = NULL;
}
}
gst_object_unref (peer);
}
gst_caps_replace (&self->subcaps, subcaps);
if (subcaps)
gst_caps_unref (subcaps);
}
GST_DEBUG_OBJECT (self, "Current subtitle caps: %" GST_PTR_FORMAT, subcaps);
/* If there are no subcaps but the subtitle sink is blocked upstream
* must behave wrong as there are no fixed caps set for the first
* buffer or in-order event after stream-start */
if (G_UNLIKELY (!subcaps && self->subtitle_sink_blocked)) {
GST_ELEMENT_WARNING (self, CORE, NEGOTIATION, (NULL),
("Subtitle sink is blocked but we have no subtitle caps"));
subcaps = NULL;
}
if (self->subtitle_error || (self->silent && !self->silent_property)) {
_setup_passthrough (self);
do_async_done (self);
goto out;
}
/* Now do something with the caps */
if (subcaps && !self->subtitle_flush) {
GstPad *target =
gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad));
if (target && pad_supports_caps (target, subcaps)) {
GST_DEBUG_OBJECT (pad, "Target accepts caps");
gst_object_unref (target);
/* Unblock pads */
unblock_video (self);
unblock_subtitle (self);
goto out;
} else if (target) {
gst_object_unref (target);
}
}
if (self->subtitle_sink_blocked && !self->video_sink_blocked) {
GST_DEBUG_OBJECT (self, "Subtitle sink blocked but video not blocked");
block_video (self);
goto out;
}
self->subtitle_flush = FALSE;
/* Find our factories */
g_mutex_lock (&self->factories_lock);
gst_subtitle_overlay_update_factory_list (self);
if (subcaps) {
factories =
gst_subtitle_overlay_get_factories_for_caps (self->factories, subcaps);
if (!factories) {
GstMessage *msg;
msg = gst_missing_decoder_message_new (GST_ELEMENT_CAST (self), subcaps);
gst_element_post_message (GST_ELEMENT_CAST (self), msg);
GST_ELEMENT_WARNING (self, CORE, MISSING_PLUGIN, (NULL),
("no suitable subtitle plugin found"));
subcaps = NULL;
self->subtitle_error = TRUE;
}
}
g_mutex_unlock (&self->factories_lock);
if (!subcaps) {
_setup_passthrough (self);
do_async_done (self);
goto out;
}
/* Now the interesting parts are done: subtitle overlaying! */
/* Sort the factories by rank */
factories = g_list_sort (factories, (GCompareFunc) _sort_by_ranks);
for (l = factories; l; l = l->next) {
GstElementFactory *factory = l->data;
gboolean is_renderer = _is_renderer (factory);
GstPad *sink, *src;
/* Unlink & destroy everything */
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->video_sinkpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad),
NULL);
self->silent_property = NULL;
_remove_element (self, &self->post_colorspace);
_remove_element (self, &self->overlay);
_remove_element (self, &self->parser);
_remove_element (self, &self->renderer);
_remove_element (self, &self->pre_colorspace);
_remove_element (self, &self->passthrough_identity);
GST_DEBUG_OBJECT (self, "Trying factory '%s'",
GST_STR_NULL (gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST
(factory))));
if (G_UNLIKELY ((is_renderer
&& !_create_element (self, &self->renderer, NULL, factory,
"renderer", FALSE)) || (!is_renderer
&& !_create_element (self, &self->parser, NULL, factory,
"parser", FALSE))))
continue;
if (!is_renderer) {
GstCaps *parser_caps;
GList *overlay_factories, *k;
if (!_setup_parser (self))
continue;
/* Find our factories */
src = gst_element_get_static_pad (self->parser, "src");
parser_caps = gst_pad_query_caps (src, NULL);
gst_object_unref (src);
g_assert (parser_caps != NULL);
g_mutex_lock (&self->factories_lock);
gst_subtitle_overlay_update_factory_list (self);
GST_DEBUG_OBJECT (self,
"Searching overlay factories for caps %" GST_PTR_FORMAT, parser_caps);
overlay_factories =
gst_subtitle_overlay_get_factories_for_caps (self->factories,
parser_caps);
g_mutex_unlock (&self->factories_lock);
if (!overlay_factories) {
GST_WARNING_OBJECT (self,
"Found no suitable overlay factories for caps %" GST_PTR_FORMAT,
parser_caps);
gst_caps_unref (parser_caps);
continue;
}
gst_caps_unref (parser_caps);
/* Sort the factories by rank */
overlay_factories =
g_list_sort (overlay_factories, (GCompareFunc) _sort_by_ranks);
for (k = overlay_factories; k; k = k->next) {
GstElementFactory *overlay_factory = k->data;
GST_DEBUG_OBJECT (self, "Trying overlay factory '%s'",
GST_STR_NULL (gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST
(overlay_factory))));
/* Try this factory and link it, otherwise unlink everything
* again and remove the overlay. Up to this point only the
* parser was instantiated and setup, nothing was linked
*/
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->video_sinkpad),
NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad),
NULL);
self->silent_property = NULL;
_remove_element (self, &self->post_colorspace);
_remove_element (self, &self->overlay);
_remove_element (self, &self->pre_colorspace);
if (!_create_element (self, &self->overlay, NULL, overlay_factory,
"overlay", FALSE)) {
GST_DEBUG_OBJECT (self, "Could not create element");
continue;
}
if (!_setup_renderer (self, self->overlay)) {
GST_DEBUG_OBJECT (self, "Could not setup element");
continue;
}
src = gst_element_get_static_pad (self->parser, "src");
if (!_link_renderer (self, self->overlay, src)) {
GST_DEBUG_OBJECT (self, "Could not link element");
gst_object_unref (src);
continue;
}
gst_object_unref (src);
/* Everything done here, go out of loop */
GST_DEBUG_OBJECT (self, "%s is a suitable element",
GST_STR_NULL (gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST
(overlay_factory))));
break;
}
if (overlay_factories)
gst_plugin_feature_list_free (overlay_factories);
if (G_UNLIKELY (k == NULL)) {
GST_WARNING_OBJECT (self, "Failed to find usable overlay factory");
continue;
}
/* Now link subtitle sinkpad of the bin and the parser */
sink = gst_element_get_static_pad (self->parser, "sink");
if (!gst_ghost_pad_set_target (GST_GHOST_PAD_CAST
(self->subtitle_sinkpad), sink)) {
gst_object_unref (sink);
continue;
}
gst_object_unref (sink);
/* Everything done here, go out of loop */
break;
} else {
/* Is renderer factory */
if (!_setup_renderer (self, self->renderer))
continue;
/* subtitle_src==NULL means: use subtitle_sink ghostpad */
if (!_link_renderer (self, self->renderer, NULL))
continue;
/* Everything done here, go out of loop */
break;
}
}
if (G_UNLIKELY (l == NULL)) {
GST_ELEMENT_WARNING (self, CORE, FAILED, (NULL),
("Failed to find any usable factories"));
self->subtitle_error = TRUE;
_setup_passthrough (self);
do_async_done (self);
goto out;
}
GST_DEBUG_OBJECT (self, "Everything worked, unblocking pads");
unblock_video (self);
unblock_subtitle (self);
_update_subtitle_offset (self);
do_async_done (self);
out:
if (factories)
gst_plugin_feature_list_free (factories);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return GST_PAD_PROBE_OK;
}
static GstStateChangeReturn
gst_subtitle_overlay_change_state (GstElement * element,
GstStateChange transition)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
GST_DEBUG_OBJECT (self, "State change NULL->READY");
g_mutex_lock (&self->factories_lock);
if (G_UNLIKELY (!gst_subtitle_overlay_update_factory_list (self))) {
g_mutex_unlock (&self->factories_lock);
return GST_STATE_CHANGE_FAILURE;
}
g_mutex_unlock (&self->factories_lock);
GST_SUBTITLE_OVERLAY_LOCK (self);
/* Set the internal pads to blocking */
block_video (self);
block_subtitle (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_DEBUG_OBJECT (self, "State change READY->PAUSED");
self->fps_n = self->fps_d = 0;
self->subtitle_flush = FALSE;
self->subtitle_error = FALSE;
self->downstream_chain_error = FALSE;
do_async_start (self);
ret = GST_STATE_CHANGE_ASYNC;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_DEBUG_OBJECT (self, "State change PAUSED->PLAYING");
default:
break;
}
{
GstStateChangeReturn bret;
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
GST_DEBUG_OBJECT (self, "Base class state changed returned: %d", bret);
if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE)) {
do_async_done (self);
return ret;
}
else if (bret == GST_STATE_CHANGE_ASYNC)
ret = bret;
else if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) {
do_async_done (self);
ret = bret;
}
}
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_DEBUG_OBJECT (self, "State change PLAYING->PAUSED");
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_DEBUG_OBJECT (self, "State change PAUSED->READY");
/* Set the pads back to blocking state */
GST_SUBTITLE_OVERLAY_LOCK (self);
block_video (self);
block_subtitle (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
do_async_done (self);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
GST_DEBUG_OBJECT (self, "State change READY->NULL");
GST_SUBTITLE_OVERLAY_LOCK (self);
gst_caps_replace (&self->subcaps, NULL);
/* Unlink ghost pads */
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->srcpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->video_sinkpad), NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad),
NULL);
/* Unblock pads */
unblock_video (self);
unblock_subtitle (self);
/* Remove elements */
self->silent_property = NULL;
_remove_element (self, &self->post_colorspace);
_remove_element (self, &self->overlay);
_remove_element (self, &self->parser);
_remove_element (self, &self->renderer);
_remove_element (self, &self->pre_colorspace);
_remove_element (self, &self->passthrough_identity);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
break;
}
return ret;
}
static void
gst_subtitle_overlay_handle_message (GstBin * bin, GstMessage * message)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY_CAST (bin);
if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR) {
GstObject *src = GST_MESSAGE_SRC (message);
/* Convert error messages from the subtitle pipeline to
* warnings and switch to passthrough mode */
if (src && (
(self->overlay
&& gst_object_has_as_ancestor (src,
GST_OBJECT_CAST (self->overlay))) || (self->parser
&& gst_object_has_as_ancestor (src,
GST_OBJECT_CAST (self->parser))) || (self->renderer
&& gst_object_has_as_ancestor (src,
GST_OBJECT_CAST (self->renderer))))) {
GError *err = NULL;
gchar *debug = NULL;
GstMessage *wmsg;
gst_message_parse_error (message, &err, &debug);
GST_DEBUG_OBJECT (self,
"Got error message from subtitle element %s: %s (%s)",
GST_MESSAGE_SRC_NAME (message), GST_STR_NULL (err->message),
GST_STR_NULL (debug));
wmsg = gst_message_new_warning (src, err, debug);
gst_message_unref (message);
g_error_free (err);
g_free (debug);
message = wmsg;
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_error = TRUE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
}
}
GST_BIN_CLASS (parent_class)->handle_message (bin, message);
}
static void
gst_subtitle_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY_CAST (object);
switch (prop_id) {
case PROP_SILENT:
g_value_set_boolean (value, self->silent);
break;
case PROP_FONT_DESC:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_value_set_string (value, self->font_desc);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_ENCODING:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_value_set_string (value, self->encoding);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_TS_OFFSET:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_value_set_int64 (value, self->subtitle_ts_offset);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_subtitle_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY_CAST (object);
switch (prop_id) {
case PROP_SILENT:
GST_SUBTITLE_OVERLAY_LOCK (self);
self->silent = g_value_get_boolean (value);
if (self->silent_property) {
gboolean silent = self->silent;
if (self->silent_property_invert)
silent = !silent;
if (self->overlay)
g_object_set (self->overlay, self->silent_property, silent, NULL);
else if (self->renderer)
g_object_set (self->renderer, self->silent_property, silent, NULL);
} else {
block_subtitle (self);
block_video (self);
}
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_FONT_DESC:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_free (self->font_desc);
self->font_desc = g_value_dup_string (value);
if (self->overlay
&& _has_property_with_type (G_OBJECT (self->overlay), "font-desc",
G_TYPE_STRING))
g_object_set (self->overlay, "font-desc", self->font_desc, NULL);
else if (self->renderer
&& _has_property_with_type (G_OBJECT (self->renderer), "font-desc",
G_TYPE_STRING))
g_object_set (self->renderer, "font-desc", self->font_desc, NULL);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_ENCODING:
GST_SUBTITLE_OVERLAY_LOCK (self);
g_free (self->encoding);
self->encoding = g_value_dup_string (value);
if (self->renderer
&& _has_property_with_type (G_OBJECT (self->renderer),
"subtitle-encoding", G_TYPE_STRING))
g_object_set (self->renderer, "subtitle-encoding", self->encoding,
NULL);
if (self->parser
&& _has_property_with_type (G_OBJECT (self->parser),
"subtitle-encoding", G_TYPE_STRING))
g_object_set (self->parser, "subtitle-encoding", self->encoding, NULL);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case PROP_SUBTITLE_TS_OFFSET:
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_ts_offset = g_value_get_int64 (value);
_update_subtitle_offset (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_subtitle_overlay_class_init (GstSubtitleOverlayClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
GstBinClass *bin_class = (GstBinClass *) klass;
gobject_class->finalize = gst_subtitle_overlay_finalize;
gobject_class->set_property = gst_subtitle_overlay_set_property;
gobject_class->get_property = gst_subtitle_overlay_get_property;
g_object_class_install_property (gobject_class, PROP_SILENT,
g_param_spec_boolean ("silent",
"Silent",
"Whether to show subtitles", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FONT_DESC,
g_param_spec_string ("font-desc",
"Subtitle font description",
"Pango font description of font "
"to be used for subtitle rendering", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBTITLE_ENCODING,
g_param_spec_string ("subtitle-encoding", "subtitle encoding",
"Encoding to assume if input subtitles are not in UTF-8 encoding. "
"If not set, the GST_SUBTITLE_ENCODING environment variable will "
"be checked for an encoding to use. If that is not set either, "
"ISO-8859-15 will be assumed.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SUBTITLE_TS_OFFSET,
g_param_spec_int64 ("subtitle-ts-offset", "Subtitle Timestamp Offset",
"The synchronisation offset between text and video in nanoseconds",
G_MININT64, G_MAXINT64, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class, &srctemplate);
gst_element_class_add_static_pad_template (element_class,
&video_sinktemplate);
gst_element_class_add_static_pad_template (element_class,
&subtitle_sinktemplate);
gst_element_class_set_static_metadata (element_class, "Subtitle Overlay",
"Video/Overlay/Subtitle",
"Overlays a video stream with subtitles",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_change_state);
bin_class->handle_message =
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_handle_message);
}
static GstFlowReturn
gst_subtitle_overlay_src_proxy_chain (GstPad * proxypad, GstObject * parent,
GstBuffer * buffer)
{
GstPad *ghostpad;
GstSubtitleOverlay *self;
GstFlowReturn ret;
ghostpad = GST_PAD_CAST (parent);
if (G_UNLIKELY (!ghostpad)) {
gst_buffer_unref (buffer);
return GST_FLOW_ERROR;
}
self = GST_SUBTITLE_OVERLAY_CAST (gst_pad_get_parent (ghostpad));
if (G_UNLIKELY (!self || self->srcpad != ghostpad)) {
gst_buffer_unref (buffer);
gst_object_unref (ghostpad);
return GST_FLOW_ERROR;
}
ret = gst_proxy_pad_chain_default (proxypad, parent, buffer);
if (IS_VIDEO_CHAIN_IGNORE_ERROR (ret)) {
GST_ERROR_OBJECT (self, "Downstream chain error: %s",
gst_flow_get_name (ret));
self->downstream_chain_error = TRUE;
}
gst_object_unref (self);
return ret;
}
static gboolean
gst_subtitle_overlay_src_proxy_event (GstPad * proxypad, GstObject * parent,
GstEvent * event)
{
GstPad *ghostpad = NULL;
GstSubtitleOverlay *self = NULL;
gboolean ret = FALSE;
const GstStructure *s;
ghostpad = GST_PAD_CAST (parent);
if (G_UNLIKELY (!ghostpad))
goto out;
self = GST_SUBTITLE_OVERLAY_CAST (gst_pad_get_parent (ghostpad));
if (G_UNLIKELY (!self || self->srcpad != ghostpad))
goto out;
s = gst_event_get_structure (event);
if (s && gst_structure_id_has_field (s, _subtitle_overlay_event_marker_id)) {
GST_DEBUG_OBJECT (ghostpad,
"Dropping event with marker: %" GST_PTR_FORMAT,
gst_event_get_structure (event));
gst_event_unref (event);
event = NULL;
ret = TRUE;
} else {
ret = gst_pad_event_default (proxypad, parent, event);
event = NULL;
}
out:
if (event)
gst_event_unref (event);
if (self)
gst_object_unref (self);
return ret;
}
static gboolean
gst_subtitle_overlay_video_sink_setcaps (GstSubtitleOverlay * self,
GstCaps * caps)
{
GstPad *target;
gboolean ret = TRUE;
GstVideoInfo info;
GST_DEBUG_OBJECT (self, "Setting caps: %" GST_PTR_FORMAT, caps);
if (!gst_video_info_from_caps (&info, caps)) {
GST_ERROR_OBJECT (self, "Failed to parse caps");
ret = FALSE;
goto out;
}
target = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (self->video_sinkpad));
GST_SUBTITLE_OVERLAY_LOCK (self);
if (!target || !pad_supports_caps (target, caps)) {
GST_DEBUG_OBJECT (target, "Target did not accept caps -- reconfiguring");
block_subtitle (self);
block_video (self);
}
if (self->fps_n != info.fps_n || self->fps_d != info.fps_d) {
GST_DEBUG_OBJECT (self, "New video fps: %d/%d", info.fps_n, info.fps_d);
self->fps_n = info.fps_n;
self->fps_d = info.fps_d;
gst_subtitle_overlay_set_fps (self);
}
GST_SUBTITLE_OVERLAY_UNLOCK (self);
if (target)
gst_object_unref (target);
out:
return ret;
}
static gboolean
gst_subtitle_overlay_video_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
gboolean ret;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_subtitle_overlay_video_sink_setcaps (self, caps);
if (!ret)
goto done;
break;
}
default:
break;
}
ret = gst_pad_event_default (pad, parent, gst_event_ref (event));
done:
gst_event_unref (event);
return ret;
}
/**
* gst_subtitle_overlay_add_feature_and_intersect:
*
* Creates a new #GstCaps containing the (given caps +
* given caps feature) + (given caps intersected by the
* given filter).
*
* Returns: the new #GstCaps
*/
static GstCaps *
gst_subtitle_overlay_add_feature_and_intersect (GstCaps * caps,
const gchar * feature, GstCaps * filter)
{
int i, caps_size;
GstCaps *new_caps;
new_caps = gst_caps_copy (caps);
caps_size = gst_caps_get_size (new_caps);
for (i = 0; i < caps_size; i++) {
GstCapsFeatures *features = gst_caps_get_features (new_caps, i);
if (!gst_caps_features_is_any (features)) {
gst_caps_features_add (features, feature);
}
}
gst_caps_append (new_caps, gst_caps_intersect_full (caps,
filter, GST_CAPS_INTERSECT_FIRST));
return new_caps;
}
/**
* gst_subtitle_overlay_intersect_by_feature:
*
* Creates a new #GstCaps based on the following filtering rule.
*
* For each individual caps contained in given caps, if the
* caps uses the given caps feature, keep a version of the caps
* with the feature and an another one without. Otherwise, intersect
* the caps with the given filter.
*
* Returns: the new #GstCaps
*/
static GstCaps *
gst_subtitle_overlay_intersect_by_feature (GstCaps * caps,
const gchar * feature, GstCaps * filter)
{
int i, caps_size;
GstCaps *new_caps;
new_caps = gst_caps_new_empty ();
caps_size = gst_caps_get_size (caps);
for (i = 0; i < caps_size; i++) {
GstStructure *caps_structure = gst_caps_get_structure (caps, i);
GstCapsFeatures *caps_features =
gst_caps_features_copy (gst_caps_get_features (caps, i));
GstCaps *filtered_caps;
GstCaps *simple_caps =
gst_caps_new_full (gst_structure_copy (caps_structure), NULL);
gst_caps_set_features (simple_caps, 0, caps_features);
if (gst_caps_features_contains (caps_features, feature)) {
gst_caps_append (new_caps, gst_caps_copy (simple_caps));
gst_caps_features_remove (caps_features, feature);
filtered_caps = gst_caps_ref (simple_caps);
} else {
filtered_caps = gst_caps_intersect_full (simple_caps, filter,
GST_CAPS_INTERSECT_FIRST);
}
gst_caps_unref (simple_caps);
gst_caps_append (new_caps, filtered_caps);
}
return new_caps;
}
static GstCaps *
gst_subtitle_overlay_get_videosink_caps (GstSubtitleOverlay * overlay,
GstPad * pad, GstCaps * filter)
{
GstPad *srcpad = overlay->srcpad;
GstCaps *peer_caps = NULL, *caps = NULL, *overlay_filter = NULL;
if (filter) {
/* filter caps + composition feature + filter caps
* filtered by the software caps. */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
overlay_filter = gst_subtitle_overlay_add_feature_and_intersect (filter,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
GST_DEBUG_OBJECT (overlay, "overlay filter %" GST_PTR_FORMAT,
overlay_filter);
}
peer_caps = gst_pad_peer_query_caps (srcpad, overlay_filter);
if (overlay_filter)
gst_caps_unref (overlay_filter);
if (peer_caps) {
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peer_caps);
if (gst_caps_is_any (peer_caps)) {
/* if peer returns ANY caps, return filtered src pad template caps */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (srcpad));
} else {
/* duplicate caps which contains the composition into one version with
* the meta and one without. Filter the other caps by the software caps */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
caps = gst_subtitle_overlay_intersect_by_feature (peer_caps,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
}
gst_caps_unref (peer_caps);
} else {
/* no peer, our padtemplate is enough then */
caps = gst_pad_get_pad_template_caps (pad);
}
if (filter) {
GstCaps *intersection = gst_caps_intersect_full (filter, caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
GST_DEBUG_OBJECT (overlay, "returning %" GST_PTR_FORMAT, caps);
return caps;
}
static gboolean
gst_subtitle_overlay_video_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstSubtitleOverlay *overlay = (GstSubtitleOverlay *) parent;
gboolean res = FALSE;
GST_DEBUG_OBJECT (pad, "query %" GST_PTR_FORMAT, query);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstPad *target = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (pad));
if (target) {
/* If we have a peer, we let the default handler take care of it */
res = gst_pad_query_default (pad, parent, query);
gst_object_unref (target);
} else {
GstCaps *filter, *caps;
/* We haven't instantiated the internal elements yet, we handle it ourselves */
gst_query_parse_caps (query, &filter);
caps = gst_subtitle_overlay_get_videosink_caps (overlay, pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
}
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static GstFlowReturn
gst_subtitle_overlay_video_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
GstFlowReturn ret = gst_proxy_pad_chain_default (pad, parent, buffer);
if (G_UNLIKELY (self->downstream_chain_error) || self->passthrough_identity) {
return ret;
} else if (IS_VIDEO_CHAIN_IGNORE_ERROR (ret)) {
GST_DEBUG_OBJECT (self, "Subtitle renderer produced chain error: %s",
gst_flow_get_name (ret));
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_error = TRUE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return GST_FLOW_OK;
}
return ret;
}
static GstFlowReturn
gst_subtitle_overlay_subtitle_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
if (self->subtitle_error) {
gst_buffer_unref (buffer);
return GST_FLOW_OK;
} else {
GstFlowReturn ret = gst_proxy_pad_chain_default (pad, parent, buffer);
if (IS_SUBTITLE_CHAIN_IGNORE_ERROR (ret)) {
GST_DEBUG_OBJECT (self, "Subtitle chain error: %s",
gst_flow_get_name (ret));
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_error = TRUE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return GST_FLOW_OK;
}
return ret;
}
}
static GstCaps *
gst_subtitle_overlay_subtitle_sink_getcaps (GstPad * pad, GstCaps * filter)
{
GstCaps *ret, *subcaps;
subcaps = gst_subtitle_overlay_create_factory_caps ();
if (filter) {
ret = gst_caps_intersect_full (filter, subcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (subcaps);
} else {
ret = subcaps;
}
return ret;
}
static gboolean
gst_subtitle_overlay_subtitle_sink_setcaps (GstSubtitleOverlay * self,
GstCaps * caps)
{
gboolean ret = TRUE;
GstPad *target = NULL;
GST_DEBUG_OBJECT (self, "Setting caps: %" GST_PTR_FORMAT, caps);
target =
gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (self->subtitle_sinkpad));
GST_SUBTITLE_OVERLAY_LOCK (self);
gst_caps_replace (&self->subcaps, caps);
if (target && pad_supports_caps (target, caps)) {
GST_DEBUG_OBJECT (self, "Target accepts caps");
GST_SUBTITLE_OVERLAY_UNLOCK (self);
goto out;
}
GST_DEBUG_OBJECT (self, "Target did not accept caps");
self->subtitle_error = FALSE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
out:
if (target)
gst_object_unref (target);
return ret;
}
static GstPadLinkReturn
gst_subtitle_overlay_subtitle_sink_link (GstPad * pad, GstObject * parent,
GstPad * peer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
GstCaps *caps;
GST_DEBUG_OBJECT (pad, "Linking pad to peer %" GST_PTR_FORMAT, peer);
caps = gst_pad_get_current_caps (peer);
if (!caps) {
caps = gst_pad_query_caps (peer, NULL);
if (!gst_caps_is_fixed (caps)) {
gst_caps_unref (caps);
caps = NULL;
}
}
if (caps) {
GST_SUBTITLE_OVERLAY_LOCK (self);
GST_DEBUG_OBJECT (pad, "Have fixed peer caps: %" GST_PTR_FORMAT, caps);
gst_caps_replace (&self->subcaps, caps);
self->subtitle_error = FALSE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
gst_caps_unref (caps);
}
return GST_PAD_LINK_OK;
}
static void
gst_subtitle_overlay_subtitle_sink_unlink (GstPad * pad, GstObject * parent)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
/* FIXME: Can't use gst_pad_get_parent() here because this is called with
* the object lock from state changes
*/
GST_DEBUG_OBJECT (pad, "Pad unlinking");
gst_caps_replace (&self->subcaps, NULL);
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_error = FALSE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
}
static gboolean
gst_subtitle_overlay_subtitle_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (parent);
gboolean ret;
GST_DEBUG_OBJECT (pad, "Got event %" GST_PTR_FORMAT, event);
if (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_DOWNSTREAM_OOB &&
gst_event_has_name (event, "playsink-custom-subtitle-flush")) {
GST_DEBUG_OBJECT (pad, "Custom subtitle flush event");
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_flush = TRUE;
self->subtitle_error = FALSE;
block_subtitle (self);
block_video (self);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
gst_event_unref (event);
event = NULL;
ret = TRUE;
goto out;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_subtitle_overlay_subtitle_sink_setcaps (self, caps);
if (!ret)
goto out;
break;
}
case GST_EVENT_FLUSH_STOP:
case GST_EVENT_FLUSH_START:
case GST_EVENT_SEGMENT:
case GST_EVENT_EOS:
{
GstStructure *structure;
/* Add our event marker to make sure no events from here go ever outside
* the element, they're only interesting for our internal elements */
event = GST_EVENT_CAST (gst_event_make_writable (event));
structure = gst_event_writable_structure (event);
gst_structure_id_set (structure, _subtitle_overlay_event_marker_id,
G_TYPE_BOOLEAN, TRUE, NULL);
break;
}
default:
break;
}
ret = gst_pad_event_default (pad, parent, gst_event_ref (event));
gst_event_unref (event);
out:
return ret;
}
static gboolean
gst_subtitle_overlay_subtitle_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean ret;
GST_DEBUG_OBJECT (pad, "got query %" GST_PTR_FORMAT, query);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ACCEPT_CAPS:
{
gst_query_set_accept_caps_result (query, TRUE);
ret = TRUE;
break;
}
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_subtitle_overlay_subtitle_sink_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
break;
}
return ret;
}
static void
gst_subtitle_overlay_init (GstSubtitleOverlay * self)
{
GstPadTemplate *templ;
GstPad *proxypad = NULL;
g_mutex_init (&self->lock);
g_mutex_init (&self->factories_lock);
templ = gst_static_pad_template_get (&srctemplate);
self->srcpad = gst_ghost_pad_new_no_target_from_template ("src", templ);
gst_object_unref (templ);
proxypad =
GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD (self->srcpad)));
gst_pad_set_event_function (proxypad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_src_proxy_event));
gst_pad_set_chain_function (proxypad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_src_proxy_chain));
gst_object_unref (proxypad);
gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
templ = gst_static_pad_template_get (&video_sinktemplate);
self->video_sinkpad =
gst_ghost_pad_new_no_target_from_template ("video_sink", templ);
gst_object_unref (templ);
gst_pad_set_event_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_event));
gst_pad_set_query_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_query));
gst_pad_set_chain_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_chain));
proxypad =
GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD
(self->video_sinkpad)));
self->video_block_pad = proxypad;
gst_object_unref (proxypad);
gst_element_add_pad (GST_ELEMENT_CAST (self), self->video_sinkpad);
templ = gst_static_pad_template_get (&subtitle_sinktemplate);
self->subtitle_sinkpad =
gst_ghost_pad_new_no_target_from_template ("subtitle_sink", templ);
gst_object_unref (templ);
gst_pad_set_link_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_link));
gst_pad_set_unlink_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_unlink));
gst_pad_set_event_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_event));
gst_pad_set_query_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_query));
gst_pad_set_chain_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_chain));
proxypad =
GST_PAD_CAST (gst_proxy_pad_get_internal (GST_PROXY_PAD
(self->subtitle_sinkpad)));
self->subtitle_block_pad = proxypad;
gst_object_unref (proxypad);
gst_element_add_pad (GST_ELEMENT_CAST (self), self->subtitle_sinkpad);
self->fps_n = 0;
self->fps_d = 0;
}
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