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gstreamer/gst/playback/gstsubtitleoverlay.c
Sebastian Dröge 732f3055a3 subtitleoverlay: Fix some pad refcount issues 
Fixes bug #603345.
2009-11-30 10:22:54 +01:00

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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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-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.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch -v filesrc location=test.mkv ! matroskademux name=demux ! "video/x-h264" ! queue2 ! decodebin2 ! subtitleoverlay name=overlay ! ffmpegcolorspace ! autovideosink demux. ! "video/x-dvd-subpicture" ! queue2 ! overlay.
* ]| This will play back the given Matroska file with h264 video and subpicture subtitles.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsubtitleoverlay.h"
#include <gst/gstfilter.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)
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv"));
static GstStaticPadTemplate video_sinktemplate =
GST_STATIC_PAD_TEMPLATE ("video_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-rgb; video/x-raw-yuv"));
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
};
GST_BOILERPLATE (GstSubtitleOverlay, gst_subtitle_overlay, GstBin,
GST_TYPE_BIN);
static void _pad_blocked_cb (GstPad * pad, gboolean blocked,
gpointer user_data);
static GQuark _subtitle_overlay_event_marker_id = 0;
static void
do_async_start (GstSubtitleOverlay * self)
{
if (!self->do_async) {
GstMessage *msg =
gst_message_new_async_start (GST_OBJECT_CAST (self), FALSE);
GST_DEBUG_OBJECT (self, "Posting async-start");
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_DEBUG_OBJECT (self, "Posting async-done");
parent_class->handle_message (GST_BIN_CAST (self), msg);
self->do_async = FALSE;
}
}
static void
gst_subtitle_overlay_finalize (GObject * object)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (object);
if (self->lock) {
g_mutex_free (self->lock);
self->lock = NULL;
}
if (self->factories_lock) {
g_mutex_free (self->factories_lock);
self->factories_lock = NULL;
}
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;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
_is_renderer (GstElementFactory * factory)
{
const gchar *klass, *name;
klass = gst_element_factory_get_klass (factory);
name = gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
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_klass (factory);
if (strstr (klass, "Parser/Subtitle") != NULL)
return TRUE;
return FALSE;
}
static const gchar *_sub_pad_names[] = { "subpicture", "subpicture_sink",
"text", "text_sink",
"subtitle_sink", "subtitle"
};
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) {
GstCaps *tmp;
GST_DEBUG ("Found renderer element %s (%s) with caps %" GST_PTR_FORMAT,
gst_element_factory_get_longname (factory),
gst_plugin_feature_get_name (feature), templ_caps);
tmp = gst_caps_union (*subcaps, templ_caps);
gst_caps_unref (templ_caps);
gst_caps_replace (subcaps, tmp);
gst_caps_unref (tmp);
return TRUE;
} else if (!is_renderer && !have_video_sink && templ_caps) {
GstCaps *tmp;
GST_DEBUG ("Found parser element %s (%s) with caps %" GST_PTR_FORMAT,
gst_element_factory_get_longname (factory),
gst_plugin_feature_get_name (feature), templ_caps);
tmp = gst_caps_union (*subcaps, templ_caps);
gst_caps_unref (templ_caps);
gst_caps_replace (subcaps, tmp);
gst_caps_unref (tmp);
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)
{
if (!self->factories
|| self->factories_cookie !=
gst_default_registry_get_feature_list_cookie ()) {
GstCaps *subcaps;
GList *factories;
subcaps = gst_caps_new_empty ();
factories = gst_default_registry_feature_filter (
(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 = gst_default_registry_get_feature_list_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)
{
GList *factories;
GstCaps *subcaps = NULL;
G_LOCK (_factory_caps);
if (!_factory_caps
|| _factory_caps_cookie !=
gst_default_registry_get_feature_list_cookie ()) {
if (_factory_caps)
gst_caps_unref (_factory_caps);
_factory_caps = gst_caps_new_empty ();
factories = gst_default_registry_feature_filter (
(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 = gst_default_registry_get_feature_list_cookie ();
}
subcaps = gst_caps_ref (_factory_caps);
G_UNLOCK (_factory_caps);
return subcaps;
}
static gboolean
_filter_factories_for_caps (GstElementFactory * factory, const GstCaps * caps)
{
GstCaps *fcaps = _get_sub_caps (factory);
gboolean ret = (fcaps) ? gst_caps_can_intersect (fcaps, caps) : FALSE;
if (fcaps)
gst_caps_unref (fcaps);
if (ret)
gst_object_ref (factory);
return ret;
}
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 *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 void
_generate_update_newsegment_event (GstSegment * segment, GstEvent ** event1,
GstEvent ** event2)
{
GstEvent *event;
*event1 = NULL;
*event2 = NULL;
event = gst_event_new_new_segment_full (FALSE, segment->rate,
segment->applied_rate, segment->format, 0, segment->accum, 0);
gst_structure_id_set (event->structure, _subtitle_overlay_event_marker_id,
G_TYPE_BOOLEAN, TRUE, NULL);
*event1 = event;
event = gst_event_new_new_segment_full (FALSE, segment->rate,
segment->applied_rate, segment->format,
segment->start, segment->stop, segment->time);
gst_structure_id_set (event->structure, _subtitle_overlay_event_marker_id,
G_TYPE_BOOLEAN, TRUE, NULL);
*event2 = event;
}
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;
}
/* Send segment to the identity. This is dropped because identity
* is not linked downstream yet */
if (self->video_segment.format != GST_FORMAT_UNDEFINED) {
GstEvent *event1, *event2;
_generate_update_newsegment_event (&self->video_segment, &event1, &event2);
GST_DEBUG_OBJECT (self,
"Pushing video accumulate newsegment event: %" GST_PTR_FORMAT,
event1->structure);
GST_DEBUG_OBJECT (self,
"Pushing video update newsegment event: %" GST_PTR_FORMAT,
event2->structure);
gst_pad_send_event (sink, event1);
gst_pad_send_event (sink, event2);
}
/* 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 */
gst_pad_set_blocked_async_full (self->video_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
if (self->subtitle_sink_blocked)
gst_pad_set_blocked_async_full (self->subtitle_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
return TRUE;
}
/* Must be called with subtitleoverlay lock! */
static void
gst_subtitle_overlay_set_fps (GstSubtitleOverlay * self)
{
GObjectClass *gobject_class;
GParamSpec *pspec;
if (!self->parser || self->fps_d == 0)
return;
gobject_class = G_OBJECT_GET_CLASS (self->parser);
pspec = g_object_class_find_property (gobject_class, "video-fps");
if (!pspec || pspec->value_type != 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 const gchar *
_get_silent_property (GstElement * element, gboolean * invert)
{
static const struct
{
const gchar *name;
gboolean invert;
} properties[] = { {
"silent", FALSE}, {
"enable", TRUE}};
GObjectClass *gobject_class;
GParamSpec *pspec;
guint i;
gobject_class = G_OBJECT_GET_CLASS (element);
for (i = 0; i < G_N_ELEMENTS (properties); i++) {
pspec = g_object_class_find_property (gobject_class, properties[i].name);
if (pspec && pspec->value_type == G_TYPE_BOOLEAN) {
*invert = properties[i].invert;
return properties[i].name;
}
}
return NULL;
}
static void
_pad_blocked_cb (GstPad * pad, gboolean blocked, gpointer user_data)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY_CAST (user_data);
GstCaps *subcaps;
GList *l, *factories = NULL;
GST_DEBUG_OBJECT (pad, "Pad blocked: %d", blocked);
GST_SUBTITLE_OVERLAY_LOCK (self);
if (pad == self->video_block_pad)
self->video_sink_blocked = blocked;
else if (pad == self->subtitle_block_pad)
self->subtitle_sink_blocked = blocked;
if (!blocked) {
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return;
}
/* 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_negotiated_caps (peer);
if (!subcaps) {
subcaps = gst_pad_get_caps_reffed (peer);
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 */
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 && gst_pad_accept_caps (target, subcaps)) {
GST_DEBUG_OBJECT (pad, "Target accepts caps");
gst_object_unref (target);
/* Unblock pads */
gst_pad_set_blocked_async_full (self->video_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
if (self->subtitle_sink_blocked)
gst_pad_set_blocked_async_full (self->subtitle_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
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");
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
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_filter_run (self->factories,
(GstFilterFunc) _filter_factories_for_caps, FALSE, 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);
GstElement *element;
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;
element = is_renderer ? self->renderer : self->parser;
/* If this is a parser, create textoverlay and link video and the parser to it
* Else link the renderer to the output colorspace */
if (!is_renderer) {
GstElement *overlay;
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_negotiated_caps (video_peer);
if (!video_caps) {
video_caps = gst_pad_get_caps_reffed (video_peer);
if (!gst_caps_is_fixed (video_caps)) {
gst_caps_unref (video_caps);
video_caps = NULL;
}
}
if (video_caps
&& gst_video_parse_caps_framerate (video_caps, &fps_n, &fps_d)) {
if (self->fps_n != fps_n || self->fps_d != 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);
}
/* Try to set video fps on the parser */
gst_subtitle_overlay_set_fps (self);
/* First link everything internally */
if (G_UNLIKELY (!_create_element (self, &self->overlay, "textoverlay",
NULL, "overlay", FALSE))) {
continue;
}
overlay = self->overlay;
self->silent_property = "silent";
self->silent_property_invert = FALSE;
/* Set some properties */
g_object_set (G_OBJECT (overlay),
"halign", "center", "valign", "bottom", "wait-text", FALSE, NULL);
if (self->font_desc)
g_object_set (G_OBJECT (overlay), "font-desc", self->font_desc, NULL);
src = gst_element_get_static_pad (element, "src");
if (G_UNLIKELY (!src)) {
continue;
}
sink = gst_element_get_static_pad (overlay, "text_sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get text sink from textoverlay");
gst_object_unref (src);
continue;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link parser to textoverlay");
gst_object_unref (sink);
gst_object_unref (src);
continue;
}
gst_object_unref (sink);
gst_object_unref (src);
if (G_UNLIKELY (!_create_element (self, &self->post_colorspace,
"ffmpegcolorspace", NULL, "post-colorspace", FALSE))) {
continue;
}
src = gst_element_get_static_pad (overlay, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from overlay");
continue;
}
sink = gst_element_get_static_pad (self->post_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
gst_object_unref (src);
continue;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link overlay with ffmpegcolorspace");
gst_object_unref (src);
gst_object_unref (sink);
continue;
}
gst_object_unref (src);
gst_object_unref (sink);
if (G_UNLIKELY (!_create_element (self, &self->pre_colorspace,
"ffmpegcolorspace", NULL, "pre-colorspace", FALSE))) {
continue;
}
sink = gst_element_get_static_pad (overlay, "video_sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from textoverlay");
continue;
}
src = gst_element_get_static_pad (self->pre_colorspace, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get srcpad from ffmpegcolorspace");
gst_object_unref (sink);
continue;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link ffmpegcolorspace to textoverlay");
gst_object_unref (src);
gst_object_unref (sink);
continue;
}
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 ffmpegcolorspace");
continue;
}
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);
continue;
}
gst_object_unref (src);
/* Send segments to the parser/overlay if necessary. These are not sent
* outside this element because of the proxy pad event function */
if (self->video_segment.format != GST_FORMAT_UNDEFINED) {
GstEvent *event1, *event2;
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
continue;
}
_generate_update_newsegment_event (&self->video_segment, &event1,
&event2);
GST_DEBUG_OBJECT (self,
"Pushing video accumulate newsegment event: %" GST_PTR_FORMAT,
event1->structure);
GST_DEBUG_OBJECT (self,
"Pushing video update newsegment event: %" GST_PTR_FORMAT,
event2->structure);
gst_pad_send_event (sink, event1);
gst_pad_send_event (sink, event2);
gst_object_unref (sink);
}
if (self->subtitle_segment.format != GST_FORMAT_UNDEFINED) {
GstEvent *event1, *event2;
sink = gst_element_get_static_pad (element, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Failed to get subpad");
continue;
}
_generate_update_newsegment_event (&self->subtitle_segment, &event1,
&event2);
GST_DEBUG_OBJECT (self,
"Pushing subtitle accumulate newsegment event: %" GST_PTR_FORMAT,
event1->structure);
GST_DEBUG_OBJECT (self,
"Pushing subtitle update newsegment event: %" GST_PTR_FORMAT,
event2->structure);
gst_pad_send_event (sink, event1);
gst_pad_send_event (sink, event2);
gst_object_unref (sink);
}
/* Set the sink ghostpad targets */
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
continue;
}
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);
continue;
}
gst_object_unref (sink);
/* Link subtitle identity to subtitle pad of our element */
sink = gst_element_get_static_pad (element, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Failed to get subpad");
continue;
}
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);
continue;
}
gst_object_unref (sink);
} else {
const gchar *name =
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory));
if (strcmp (name, "textoverlay") == 0) {
/* Set some textoverlay specific properties */
g_object_set (G_OBJECT (element),
"halign", "center", "valign", "bottom", "wait-text", FALSE, NULL);
if (self->font_desc)
g_object_set (G_OBJECT (element), "font-desc", self->font_desc, NULL);
self->silent_property = "silent";
self->silent_property_invert = FALSE;
} else {
self->silent_property =
_get_silent_property (element, &self->silent_property_invert);
}
/* First link everything internally */
if (G_UNLIKELY (!_create_element (self, &self->post_colorspace,
"ffmpegcolorspace", NULL, "post-colorspace", FALSE))) {
continue;
}
src = gst_element_get_static_pad (element, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get src pad from renderer");
continue;
}
sink = gst_element_get_static_pad (self->post_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
gst_object_unref (src);
continue;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link renderer with ffmpegcolorspace");
gst_object_unref (src);
gst_object_unref (sink);
continue;
}
gst_object_unref (src);
gst_object_unref (sink);
if (G_UNLIKELY (!_create_element (self, &self->pre_colorspace,
"ffmpegcolorspace", NULL, "pre-colorspace", FALSE))) {
continue;
}
sink = _get_video_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get video sink from renderer");
continue;
}
src = gst_element_get_static_pad (self->pre_colorspace, "src");
if (G_UNLIKELY (!src)) {
GST_WARNING_OBJECT (self, "Can't get srcpad from ffmpegcolorspace");
gst_object_unref (sink);
continue;
}
if (G_UNLIKELY (gst_pad_link (src, sink) != GST_PAD_LINK_OK)) {
GST_WARNING_OBJECT (self, "Can't link ffmpegcolorspace to renderer");
gst_object_unref (src);
gst_object_unref (sink);
continue;
}
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 ffmpegcolorspace");
continue;
}
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);
continue;
}
gst_object_unref (src);
/* Send segments to the renderer if necessary. These are not sent
* outside this element because of the proxy pad event handler */
if (self->video_segment.format != GST_FORMAT_UNDEFINED) {
GstEvent *event1, *event2;
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
continue;
}
_generate_update_newsegment_event (&self->video_segment, &event1,
&event2);
GST_DEBUG_OBJECT (self,
"Pushing video accumulate newsegment event: %" GST_PTR_FORMAT,
event1->structure);
GST_DEBUG_OBJECT (self,
"Pushing video update newsegment event: %" GST_PTR_FORMAT,
event2->structure);
gst_pad_send_event (sink, event1);
gst_pad_send_event (sink, event2);
gst_object_unref (sink);
}
if (self->subtitle_segment.format != GST_FORMAT_UNDEFINED) {
GstEvent *event1, *event2;
sink = _get_sub_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Failed to get subpad");
continue;
}
_generate_update_newsegment_event (&self->subtitle_segment, &event1,
&event2);
GST_DEBUG_OBJECT (self,
"Pushing subtitle accumulate newsegment event: %" GST_PTR_FORMAT,
event1->structure);
GST_DEBUG_OBJECT (self,
"Pushing subtitle update newsegment event: %" GST_PTR_FORMAT,
event2->structure);
gst_pad_send_event (sink, event1);
gst_pad_send_event (sink, event2);
gst_object_unref (sink);
}
/* Set the sink ghostpad targets */
sink = gst_element_get_static_pad (self->pre_colorspace, "sink");
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Can't get sink pad from ffmpegcolorspace");
continue;
}
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);
continue;
}
gst_object_unref (sink);
sink = _get_sub_pad (element);
if (G_UNLIKELY (!sink)) {
GST_WARNING_OBJECT (self, "Failed to get subpad");
continue;
}
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);
continue;
}
gst_object_unref (sink);
}
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);
} else {
GST_DEBUG_OBJECT (self, "Everything worked, unblocking pads");
gst_pad_set_blocked_async_full (self->video_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->subtitle_block_pad, FALSE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
do_async_done (self);
}
out:
if (factories)
gst_plugin_feature_list_free (factories);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
}
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 */
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_DEBUG_OBJECT (self, "State change READY->PAUSED");
gst_segment_init (&self->video_segment, GST_FORMAT_UNDEFINED);
gst_segment_init (&self->subtitle_segment, GST_FORMAT_UNDEFINED);
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))
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");
do_async_done (self);
break;
case GST_STATE_CHANGE_READY_TO_NULL:{
GstPad *pad;
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 */
if (self->video_block_pad) {
pad = self->video_block_pad;
gst_pad_set_blocked_async_full (pad, FALSE, _pad_blocked_cb,
gst_object_ref (self), (GDestroyNotify) gst_object_unref);
}
if (self->subtitle_block_pad) {
pad = self->subtitle_block_pad;
gst_pad_set_blocked_async_full (pad, FALSE, _pad_blocked_cb,
gst_object_ref (self), (GDestroyNotify) gst_object_unref);
}
/* 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_ancestor (src,
GST_OBJECT_CAST (self->overlay))) || (self->parser
&& gst_object_has_ancestor (src,
GST_OBJECT_CAST (self->parser))) || (self->renderer
&& gst_object_has_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;
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
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;
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 {
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
}
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);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_subtitle_overlay_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&video_sinktemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&subtitle_sinktemplate));
gst_element_class_set_details_simple (gstelement_class, "Subtitle Overlay",
"Video/Overlay/Subtitle",
"Overlays a video stream with subtitles",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
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));
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, GstBuffer * buffer)
{
GstPad *ghostpad;
GstSubtitleOverlay *self;
GstFlowReturn ret;
ghostpad = GST_PAD_CAST (gst_pad_get_parent (proxypad));
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 = self->src_proxy_chain (proxypad, 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);
gst_object_unref (ghostpad);
return ret;
}
static gboolean
gst_subtitle_overlay_src_proxy_event (GstPad * proxypad, GstEvent * event)
{
GstPad *ghostpad = NULL;
GstSubtitleOverlay *self = NULL;
gboolean ret = FALSE;
const GstStructure *s;
ghostpad = GST_PAD_CAST (gst_pad_get_parent (proxypad));
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,
event->structure);
gst_event_unref (event);
event = NULL;
ret = TRUE;
} else {
ret = self->src_proxy_event (proxypad, event);
event = NULL;
}
out:
if (event)
gst_event_unref (event);
if (self)
gst_object_unref (self);
if (ghostpad)
gst_object_unref (ghostpad);
return ret;
}
static gboolean
gst_subtitle_overlay_video_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
gboolean ret = TRUE;
gint fps_n, fps_d;
GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
if (!gst_video_parse_caps_framerate (caps, &fps_n, &fps_d)) {
GST_ERROR_OBJECT (pad, "Failed to parse framerate from caps");
ret = FALSE;
goto out;
}
GST_SUBTITLE_OVERLAY_LOCK (self);
if (self->fps_n != fps_n || self->fps_d != 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;
gst_subtitle_overlay_set_fps (self);
}
GST_SUBTITLE_OVERLAY_UNLOCK (self);
ret = self->video_sink_setcaps (pad, caps);
out:
gst_object_unref (self);
return ret;
}
static gboolean
gst_subtitle_overlay_video_sink_event (GstPad * pad, GstEvent * event)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
gboolean ret;
if (GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
GST_DEBUG_OBJECT (pad,
"Resetting video segment because of flush-stop event");
gst_segment_init (&self->video_segment, GST_FORMAT_UNDEFINED);
self->fps_n = self->fps_d = 0;
}
ret = self->video_sink_event (pad, gst_event_ref (event));
if (GST_EVENT_TYPE (event) == GST_EVENT_NEWSEGMENT) {
gboolean update;
gdouble rate, applied_rate;
GstFormat format;
gint64 start, stop, position;
GST_DEBUG_OBJECT (pad, "Newsegment event: %" GST_PTR_FORMAT,
event->structure);
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
&format, &start, &stop, &position);
if (format != GST_FORMAT_TIME) {
GST_ERROR_OBJECT (pad, "Newsegment event in non-time format: %s",
gst_format_get_name (format));
gst_object_unref (event);
gst_object_unref (self);
return FALSE;
}
GST_DEBUG_OBJECT (pad, "Old video segment: %" GST_SEGMENT_FORMAT,
&self->video_segment);
gst_segment_set_newsegment_full (&self->video_segment, update, rate,
applied_rate, format, start, stop, position);
GST_DEBUG_OBJECT (pad, "New video segment: %" GST_SEGMENT_FORMAT,
&self->video_segment);
}
gst_event_unref (event);
gst_object_unref (self);
return ret;
}
static GstFlowReturn
gst_subtitle_overlay_video_sink_chain (GstPad * pad, GstBuffer * buffer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (GST_PAD_PARENT (pad));
GstFlowReturn ret = self->video_sink_chain (pad, 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;
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return GST_FLOW_OK;
}
return ret;
}
static GstFlowReturn
gst_subtitle_overlay_subtitle_sink_chain (GstPad * pad, GstBuffer * buffer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (GST_PAD_PARENT (pad));
if (self->subtitle_error) {
gst_buffer_unref (buffer);
return GST_FLOW_OK;
} else {
GstFlowReturn ret = self->subtitle_sink_chain (pad, 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;
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
return GST_FLOW_OK;
}
return ret;
}
}
static GstCaps *
gst_subtitle_overlay_subtitle_sink_getcaps (GstPad * pad)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
GstCaps *ret;
g_mutex_lock (self->factories_lock);
if (G_UNLIKELY (!gst_subtitle_overlay_update_factory_list (self)))
ret = GST_CAPS_NONE;
else
ret = gst_caps_ref (self->factory_caps);
g_mutex_unlock (self->factories_lock);
GST_DEBUG_OBJECT (pad, "Returning subtitle caps %" GST_PTR_FORMAT, ret);
gst_object_unref (self);
return ret;
}
static gboolean
gst_subtitle_overlay_subtitle_sink_acceptcaps (GstPad * pad, GstCaps * caps)
{
GstCaps *othercaps = gst_subtitle_overlay_subtitle_sink_getcaps (pad);
gboolean ret = gst_caps_can_intersect (caps, othercaps);
gst_caps_unref (othercaps);
return ret;
}
static gboolean
gst_subtitle_overlay_subtitle_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
gboolean ret = TRUE;
GstPad *target = NULL;;
GST_DEBUG_OBJECT (pad, "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 && gst_pad_accept_caps (target, caps)) {
GST_DEBUG_OBJECT (pad, "Target accepts caps");
ret = self->subtitle_sink_setcaps (pad, caps);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
goto out;
}
GST_DEBUG_OBJECT (pad, "Target did not accept caps");
self->subtitle_error = FALSE;
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
out:
if (target)
gst_object_unref (target);
gst_object_unref (self);
return ret;
}
static GstPadLinkReturn
gst_subtitle_overlay_subtitle_sink_link (GstPad * pad, GstPad * peer)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
GstPadLinkReturn ret;
GstCaps *caps;
GST_DEBUG_OBJECT (pad, "Linking pad to peer %" GST_PTR_FORMAT, peer);
caps = gst_pad_get_negotiated_caps (peer);
if (!caps) {
caps = gst_pad_get_caps_reffed (peer);
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;
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
gst_caps_unref (caps);
}
ret = self->subtitle_sink_link (pad, peer);
gst_object_unref (self);
return ret;
}
static void
gst_subtitle_overlay_subtitle_sink_unlink (GstPad * pad)
{
GstSubtitleOverlay *self =
GST_SUBTITLE_OVERLAY (gst_object_ref (GST_PAD_PARENT (pad)));
/* 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);
self->subtitle_sink_unlink (pad);
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_error = FALSE;
if (self->subtitle_block_pad)
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
if (self->video_block_pad)
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
gst_object_unref (self);
}
static gboolean
gst_subtitle_overlay_subtitle_sink_event (GstPad * pad, GstEvent * event)
{
GstSubtitleOverlay *self = GST_SUBTITLE_OVERLAY (gst_pad_get_parent (pad));
gboolean ret;
GstFormat format;
if (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_DOWNSTREAM_OOB &&
event->structure
&& strcmp (gst_structure_get_name (event->structure),
"subtitleoverlay-flush-subtitle") == 0) {
GST_DEBUG_OBJECT (pad, "Custom subtitle flush event");
GST_SUBTITLE_OVERLAY_LOCK (self);
self->subtitle_flush = TRUE;
self->subtitle_error = FALSE;
if (self->subtitle_block_pad)
gst_pad_set_blocked_async_full (self->subtitle_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
if (self->video_block_pad)
gst_pad_set_blocked_async_full (self->video_block_pad, TRUE,
_pad_blocked_cb, gst_object_ref (self),
(GDestroyNotify) gst_object_unref);
GST_SUBTITLE_OVERLAY_UNLOCK (self);
gst_event_unref (event);
event = NULL;
ret = TRUE;
goto out;
} else if (GST_EVENT_TYPE (event) == GST_EVENT_NEWSEGMENT) {
gst_event_parse_new_segment_full (event, NULL, NULL, NULL,
&format, NULL, NULL, NULL);
if (self->subtitle_segment.format != GST_FORMAT_UNDEFINED &&
self->subtitle_segment.format != format) {
GST_DEBUG_OBJECT (pad, "Subtitle segment format changed: %s -> %s",
gst_format_get_name (self->subtitle_segment.format),
gst_format_get_name (format));
gst_segment_init (&self->subtitle_segment, GST_FORMAT_UNDEFINED);
}
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (pad,
"Resetting subtitle segment because of flush-stop");
gst_segment_init (&self->subtitle_segment, GST_FORMAT_UNDEFINED);
/* fall through */
case GST_EVENT_FLUSH_START:
case GST_EVENT_NEWSEGMENT:
case GST_EVENT_EOS:
/* 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_mini_object_make_writable (GST_MINI_OBJECT_CAST
(event)));
if (!event->structure) {
event->structure =
gst_structure_id_empty_new (_subtitle_overlay_event_marker_id);
gst_structure_set_parent_refcount (event->structure,
&event->mini_object.refcount);
}
gst_structure_id_set (event->structure, _subtitle_overlay_event_marker_id,
G_TYPE_BOOLEAN, TRUE, NULL);
break;
default:
break;
}
ret = self->subtitle_sink_event (pad, gst_event_ref (event));
if (GST_EVENT_TYPE (event) == GST_EVENT_NEWSEGMENT) {
gboolean update;
gdouble rate, applied_rate;
gint64 start, stop, position;
GST_DEBUG_OBJECT (pad, "Newsegment event: %" GST_PTR_FORMAT,
event->structure);
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
&format, &start, &stop, &position);
GST_DEBUG_OBJECT (pad, "Old subtitle segment: %" GST_SEGMENT_FORMAT,
&self->subtitle_segment);
if (self->subtitle_segment.format != format) {
GST_DEBUG_OBJECT (pad, "Subtitle segment format changed: %s -> %s",
gst_format_get_name (self->subtitle_segment.format),
gst_format_get_name (format));
gst_segment_init (&self->subtitle_segment, format);
}
gst_segment_set_newsegment_full (&self->subtitle_segment, update, rate,
applied_rate, format, start, stop, position);
GST_DEBUG_OBJECT (pad, "New subtitle segment: %" GST_SEGMENT_FORMAT,
&self->subtitle_segment);
}
gst_event_unref (event);
out:
gst_object_unref (self);
return ret;
}
static void
gst_subtitle_overlay_init (GstSubtitleOverlay * self,
GstSubtitleOverlayClass * klass)
{
GstPadTemplate *templ;
GstIterator *it;
GstPad *proxypad = NULL;
self->lock = g_mutex_new ();
self->factories_lock = g_mutex_new ();
templ = gst_static_pad_template_get (&srctemplate);
self->srcpad = gst_ghost_pad_new_no_target_from_template ("src", templ);
it = gst_pad_iterate_internal_links (self->srcpad);
if (G_UNLIKELY (!it
|| gst_iterator_next (it, (gpointer) & proxypad) != GST_ITERATOR_OK
|| proxypad == NULL)) {
GST_ERROR_OBJECT (self, "Failed to get proxypad of srcpad");
} else {
self->src_proxy_event = GST_PAD_EVENTFUNC (proxypad);
gst_pad_set_event_function (proxypad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_src_proxy_event));
self->src_proxy_chain = GST_PAD_CHAINFUNC (proxypad);
gst_pad_set_chain_function (proxypad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_src_proxy_chain));
gst_object_unref (proxypad);
}
if (it)
gst_iterator_free (it);
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);
self->video_sink_event = GST_PAD_EVENTFUNC (self->video_sinkpad);
gst_pad_set_event_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_event));
self->video_sink_setcaps = GST_PAD_SETCAPSFUNC (self->video_sinkpad);
gst_pad_set_setcaps_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_setcaps));
self->video_sink_chain = GST_PAD_CHAINFUNC (self->video_sinkpad);
gst_pad_set_chain_function (self->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_video_sink_chain));
proxypad = NULL;
it = gst_pad_iterate_internal_links (self->video_sinkpad);
if (G_UNLIKELY (!it
|| gst_iterator_next (it, (gpointer) & proxypad) != GST_ITERATOR_OK
|| proxypad == NULL)) {
GST_ERROR_OBJECT (self,
"Failed to get internally linked pad from video sinkpad");
}
if (it)
gst_iterator_free (it);
self->video_block_pad = 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);
self->subtitle_sink_link = GST_PAD_LINKFUNC (self->subtitle_sinkpad);
gst_pad_set_link_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_link));
self->subtitle_sink_unlink = GST_PAD_UNLINKFUNC (self->subtitle_sinkpad);
gst_pad_set_unlink_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_unlink));
self->subtitle_sink_event = GST_PAD_EVENTFUNC (self->subtitle_sinkpad);
gst_pad_set_event_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_event));
self->subtitle_sink_setcaps = GST_PAD_SETCAPSFUNC (self->subtitle_sinkpad);
gst_pad_set_setcaps_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_setcaps));
self->subtitle_sink_chain = GST_PAD_CHAINFUNC (self->subtitle_sinkpad);
gst_pad_set_chain_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_chain));
gst_pad_set_getcaps_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_getcaps));
gst_pad_set_acceptcaps_function (self->subtitle_sinkpad,
GST_DEBUG_FUNCPTR (gst_subtitle_overlay_subtitle_sink_acceptcaps));
gst_pad_set_bufferalloc_function (self->subtitle_sinkpad, NULL);
proxypad = NULL;
it = gst_pad_iterate_internal_links (self->subtitle_sinkpad);
if (G_UNLIKELY (!it
|| gst_iterator_next (it, (gpointer) & proxypad) != GST_ITERATOR_OK
|| proxypad == NULL)) {
GST_ERROR_OBJECT (self,
"Failed to get internally linked pad from subtitle sinkpad");
}
if (it)
gst_iterator_free (it);
self->subtitle_block_pad = proxypad;
gst_element_add_pad (GST_ELEMENT_CAST (self), self->subtitle_sinkpad);
self->fps_n = 0;
self->fps_d = 0;
}
gboolean
gst_subtitle_overlay_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (subtitle_overlay_debug, "subtitleoverlay", 0,
"Subtitle Overlay");
_subtitle_overlay_event_marker_id =
g_quark_from_static_string ("gst-subtitle-overlay-event-marker");
return gst_element_register (plugin, "subtitleoverlay", GST_RANK_NONE,
GST_TYPE_SUBTITLE_OVERLAY);
}
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