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gstreamer/subprojects/gst-plugins-bad/gst/autoconvert/gstbaseautoconvert.c
Thibault Saunier 11f96ce4dd autoconvert: Fix race condition when creating sub elements 
There was a case where the element would get destroyed while being
added to the hash table of elements

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6989>
2024-06-05 12:53:45 +00:00

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/* GStreamer
*
* Copyright 2007-2012 Collabora Ltd
* @author: Olivier Crete <olivier.crete@collabora.com>
* Copyright 2007-2008 Nokia
*
* 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.
*/
/**
* GstBaseAutoConvert:
*
* Since: 1.24
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstbaseautoconvert.h"
#include <string.h>
GST_DEBUG_CATEGORY (baseautoconvert_debug);
#define GST_CAT_DEFAULT (baseautoconvert_debug)
#define GST_BASEAUTOCONVERT_LOCK(ac) GST_OBJECT_LOCK (ac)
#define GST_BASEAUTOCONVERT_UNLOCK(ac) GST_OBJECT_UNLOCK (ac)
#define SUPRESS_UNUSED_WARNING(a) (void)a
/* elementfactory information */
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/* GstBaseAutoConvert signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
static void gst_base_auto_convert_dispose (GObject * object);
static void gst_base_auto_convert_finalize (GObject * object);
static GstElement *gst_base_auto_convert_get_subelement (GstBaseAutoConvert *
self);
static GstPad *gst_base_auto_convert_get_internal_sinkpad (GstBaseAutoConvert *
self);
static GstPad *gst_base_auto_convert_get_internal_srcpad (GstBaseAutoConvert *
self);
static GstIterator *gst_base_auto_convert_iterate_internal_links (GstPad * pad,
GstObject * parent);
static GstCaps *gst_base_auto_convert_getcaps (GstBaseAutoConvert * self,
GstCaps * filter, GstPadDirection dir);
static GstFlowReturn gst_base_auto_convert_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstFlowReturn gst_base_auto_convert_sink_chain_list (GstPad * pad,
GstObject * parent, GstBufferList * list);
static gboolean gst_base_auto_convert_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_auto_convert_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_base_auto_convert_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_auto_convert_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GstFlowReturn gst_base_auto_convert_internal_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstFlowReturn gst_base_auto_convert_internal_sink_chain_list (GstPad *
pad, GstObject * parent, GstBufferList * list);
static gboolean gst_base_auto_convert_internal_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_auto_convert_internal_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_base_auto_convert_internal_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_auto_convert_internal_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GList *gst_base_auto_convert_get_or_load_filters_info (GstBaseAutoConvert
* self);
G_DECLARE_FINAL_TYPE (GstBaseAutoConvertPad, gst_base_auto_convert_pad, GST,
BASE_AUTO_CONVERT_PAD, GstPad);
struct _GstBaseAutoConvertPad
{
GstPad parent;
GstBaseAutoConvert *obj;
};
G_DEFINE_TYPE (GstBaseAutoConvertPad, gst_base_auto_convert_pad, GST_TYPE_PAD);
static void
gst_base_auto_convert_pad_class_init (GstBaseAutoConvertPadClass * klass)
{
}
static void
gst_base_auto_convert_pad_init (GstBaseAutoConvertPad * self)
{
SUPRESS_UNUSED_WARNING (GST_IS_BASE_AUTO_CONVERT_PAD);
}
G_DEFINE_TYPE (GstBaseAutoConvert, gst_base_auto_convert, GST_TYPE_BIN);
typedef struct
{
gint refcount;
GstPad *sink;
GstPad *src;
} InternalPads;
static InternalPads *
internal_pads_new (GstBaseAutoConvert * self, const gchar * subelement_name)
{
InternalPads *pads = g_new0 (InternalPads, 1);
gchar *name = g_strdup_printf ("internal_sink_%s", subelement_name);
pads->refcount = 1;
pads->sink = g_object_new (gst_base_auto_convert_pad_get_type (),
"name", name, "direction", GST_PAD_SINK, NULL);
g_free (name);
GST_BASE_AUTO_CONVERT_PAD (pads->sink)->obj = self;
name = g_strdup_printf ("internal_src_%s", subelement_name);
pads->src = g_object_new (gst_base_auto_convert_pad_get_type (),
"name", name, "direction", GST_PAD_SRC, NULL);
g_free (name);
GST_BASE_AUTO_CONVERT_PAD (pads->src)->obj = self;
return pads;
}
static void
internal_pads_unref (InternalPads * pads)
{
if (!g_atomic_int_dec_and_test (&pads->refcount))
return;
gst_clear_object (&pads->sink);
gst_clear_object (&pads->src);
g_free (pads);
}
static InternalPads *
internal_pads_ref (InternalPads * pads)
{
g_atomic_int_inc (&pads->refcount);
return pads;
}
static void
gst_base_auto_convert_element_removed (GstBin * bin, GstElement * child)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (bin);
g_hash_table_remove (self->elements, child);
}
static void
gst_auto_convert_filter_info_free (GstAutoConvertFilterInfo * known_bin)
{
g_free (known_bin->name);
g_free (known_bin->bindesc);
gst_caps_unref (known_bin->sink_caps);
gst_caps_unref (known_bin->src_caps);
gst_object_unref (known_bin->subbin);
g_free (known_bin);
}
static gint
g_auto_convert_filter_info_compare (GstAutoConvertFilterInfo * b1,
GstAutoConvertFilterInfo * b2)
{
gint diff;
diff = b2->rank - b1->rank;
if (diff != 0)
return diff;
diff = g_strcmp0 (b2->name, b1->name);
return diff;
}
static GstCaps *
gst_base_auto_convert_get_template_caps_for (GstElement * subbin,
GstPadDirection dir)
{
GstElement *element = NULL;
GstPad *pad = NULL;
GstCaps *res = NULL;
g_assert (g_list_length (subbin->sinkpads) == 1);
g_assert (g_list_length (subbin->srcpads) == 1);
if (GST_IS_BIN (subbin)) {
GstPad *ghostpad =
(dir == GST_PAD_SINK) ? subbin->sinkpads->data : subbin->srcpads->data;
GstPad *internal = gst_pad_get_single_internal_link (ghostpad);
pad = gst_pad_get_peer (internal);
gst_object_unref (internal);
} else {
pad =
(dir ==
GST_PAD_SINK) ? gst_object_ref (subbin->
sinkpads->data) : gst_object_ref (subbin->srcpads->data);
}
element = GST_ELEMENT (GST_OBJECT_PARENT (pad));
g_assert (element);
if (!g_strcmp0 (GST_OBJECT_NAME (gst_element_get_factory (element)),
"capsfilter")) {
g_object_get (G_OBJECT (element), "caps", &res, NULL);
} else {
res = gst_pad_get_pad_template_caps (pad);
}
gst_object_unref (pad);
return gst_caps_make_writable (res);
}
gboolean
gst_base_auto_convert_register_filter (GstBaseAutoConvert * self, gchar * name,
gchar * bindesc, GstRank rank)
{
g_assert (name);
for (GList * tmp = self->filters_info; tmp; tmp = tmp->next) {
g_return_val_if_fail (g_strcmp0 (name,
((GstAutoConvertFilterInfo *) tmp->data)->name), FALSE);
}
GError *err = NULL;
bindesc = g_strchomp (bindesc);
GstElement *subbin = gst_parse_bin_from_description_full (bindesc, TRUE,
NULL, GST_PARSE_FLAG_NO_SINGLE_ELEMENT_BINS | GST_PARSE_FLAG_PLACE_IN_BIN,
&err);
if (!subbin) {
GST_INFO ("Could not create subbin for %s", name);
g_free (name);
g_free (bindesc);
return FALSE;
}
GstAutoConvertFilterInfo *filter_info = g_new0 (GstAutoConvertFilterInfo, 1);
filter_info->sink_caps =
gst_base_auto_convert_get_template_caps_for (subbin, GST_PAD_SINK);
filter_info->src_caps =
gst_base_auto_convert_get_template_caps_for (subbin, GST_PAD_SRC);
filter_info->name = name;
filter_info->bindesc = bindesc;
filter_info->rank = rank;
gst_object_set_name (GST_OBJECT (subbin), filter_info->name);
filter_info->subbin = gst_object_ref_sink (subbin);
GST_OBJECT_LOCK (self);
self->filters_info =
g_list_insert_sorted (self->filters_info, filter_info,
(GCompareFunc) g_auto_convert_filter_info_compare);
GST_OBJECT_UNLOCK (self);
return TRUE;
}
static void
gst_base_auto_convert_class_init (GstBaseAutoConvertClass * klass)
{
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBinClass *gstbin_class = (GstBinClass *) klass;
GObjectClass *gobject_class = (GObjectClass *) klass;
GST_DEBUG_CATEGORY_INIT (baseautoconvert_debug, "baseautoconvert", 0,
"Auto convert based on caps");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_base_auto_convert_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_auto_convert_finalize);
gstbin_class->element_removed = gst_base_auto_convert_element_removed;
klass->registers_filters = TRUE;
}
static void
gst_base_auto_convert_init (GstBaseAutoConvert * self)
{
self->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
self->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
self->elements = g_hash_table_new_full (g_direct_hash, g_direct_equal,
NULL, (GDestroyNotify) internal_pads_unref);
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_sink_chain));
gst_pad_set_chain_list_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_sink_chain_list));
gst_pad_set_event_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_sink_event));
gst_pad_set_query_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_sink_query));
gst_pad_set_iterate_internal_links_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_iterate_internal_links));
gst_pad_set_event_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_src_event));
gst_pad_set_query_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_src_query));
gst_pad_set_iterate_internal_links_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_iterate_internal_links));
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
static void
gst_base_auto_convert_dispose (GObject * object)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (object);
GST_BASEAUTOCONVERT_LOCK (self);
g_clear_object (&self->current_subelement);
g_clear_object (&self->current_internal_sinkpad);
g_clear_object (&self->current_internal_srcpad);
GST_BASEAUTOCONVERT_UNLOCK (self);
G_OBJECT_CLASS (gst_base_auto_convert_parent_class)->dispose (object);
}
static void
gst_base_auto_convert_finalize (GObject * object)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (object);
if (self->factories)
gst_plugin_feature_list_free (self->factories);
g_hash_table_unref (self->elements);
g_list_free_full (self->filters_info,
(GDestroyNotify) gst_auto_convert_filter_info_free);
G_OBJECT_CLASS (gst_base_auto_convert_parent_class)->finalize (object);
}
/**
* get_pad_by_direction:
* @element: The Element
* @direction: The direction
*
* Gets a #GstPad that goes in the requested direction. I will return NULL
* if there is no pad or if there is more than one pad in this direction
*/
static GstPad *
get_pad_by_direction (GstElement * element, GstPadDirection direction)
{
GstIterator *iter = gst_element_iterate_pads (element);
GstPad *selected_pad = NULL;
gboolean done;
GValue item = { 0, };
if (!iter)
return NULL;
done = FALSE;
while (!done) {
switch (gst_iterator_next (iter, &item)) {
case GST_ITERATOR_OK:
{
GstPad *pad = g_value_get_object (&item);
if (gst_pad_get_direction (pad) == direction) {
/* We check if there is more than one pad in this direction,
* if there is, we return NULL so that the element is refused
*/
if (selected_pad) {
done = TRUE;
gst_object_unref (selected_pad);
selected_pad = NULL;
} else {
selected_pad = g_object_ref (pad);
}
}
g_value_unset (&item);
}
break;
case GST_ITERATOR_RESYNC:
if (selected_pad) {
gst_object_unref (selected_pad);
selected_pad = NULL;
}
gst_iterator_resync (iter);
break;
case GST_ITERATOR_ERROR:
GST_ERROR ("Error iterating pads of element %s",
GST_OBJECT_NAME (element));
gst_object_unref (selected_pad);
selected_pad = NULL;
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
g_value_unset (&item);
gst_iterator_free (iter);
if (!selected_pad)
GST_ERROR ("Did not find pad of direction %d in %s",
direction, GST_OBJECT_NAME (element));
return selected_pad;
}
static GstElement *
gst_base_auto_convert_get_subelement (GstBaseAutoConvert * self)
{
GstElement *element = NULL;
GST_BASEAUTOCONVERT_LOCK (self);
if (self->current_subelement)
element = gst_object_ref (self->current_subelement);
GST_BASEAUTOCONVERT_UNLOCK (self);
return element;
}
static GstPad *
gst_base_auto_convert_get_internal_sinkpad (GstBaseAutoConvert * self)
{
GstPad *pad = NULL;
GST_BASEAUTOCONVERT_LOCK (self);
if (self->current_internal_sinkpad)
pad = gst_object_ref (self->current_internal_sinkpad);
GST_BASEAUTOCONVERT_UNLOCK (self);
return pad;
}
static GstPad *
gst_base_auto_convert_get_internal_srcpad (GstBaseAutoConvert * self)
{
GstPad *pad = NULL;
GST_BASEAUTOCONVERT_LOCK (self);
if (self->current_internal_srcpad)
pad = gst_object_ref (self->current_internal_srcpad);
GST_BASEAUTOCONVERT_UNLOCK (self);
return pad;
}
/*
* This function creates and adds an element to the GstBaseAutoConvert
* it then creates the internal pads and links them
*
*/
static GstElement *
gst_base_auto_convert_add_element (GstBaseAutoConvert * self,
GstAutoConvertFilterInfo * filter_info)
{
GstElement *element = NULL;
InternalPads *pads;
g_assert (filter_info->subbin);
element = gst_object_ref (filter_info->subbin);
GST_DEBUG_OBJECT (self, "Adding element %s to the baseautoconvert bin",
filter_info->name);
pads = internal_pads_new (self, GST_OBJECT_NAME (element));
g_hash_table_insert (self->elements, element, internal_pads_ref (pads));
gst_pad_set_chain_function (pads->sink,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_sink_chain));
gst_pad_set_chain_list_function (pads->sink,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_sink_chain_list));
gst_pad_set_event_function (pads->sink,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_sink_event));
gst_pad_set_query_function (pads->sink,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_sink_query));
gst_pad_set_event_function (pads->src,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_src_event));
gst_pad_set_query_function (pads->src,
GST_DEBUG_FUNCPTR (gst_base_auto_convert_internal_src_query));
internal_pads_unref (pads);
return element;
}
static GstElement *
gst_base_auto_convert_get_or_make_element_from_filter_info (GstBaseAutoConvert *
self, GstAutoConvertFilterInfo * nb)
{
GstElement *element = NULL;
element = gst_bin_get_by_name (GST_BIN (self), nb->name);
if (!element) {
element = gst_base_auto_convert_add_element (self, nb);
}
return element;
}
/*
* This function checks if there is one and only one pad template on the
* factory that can accept the given caps. If there is one and only one,
* it returns TRUE, FALSE otherwise
*/
static gboolean
filter_info_can_intersect (GstBaseAutoConvert * self,
GstAutoConvertFilterInfo * filter_info, GstPadDirection direction,
GstCaps * caps)
{
gboolean res;
GST_LOG_OBJECT (self, "Checking if %s (bin_desc=%s) supports %s caps:",
filter_info->name, filter_info->bindesc,
direction == GST_PAD_SINK ? "sink" : "src");
GST_LOG_OBJECT (self, "Supported caps: %" GST_PTR_FORMAT,
direction ==
GST_PAD_SINK ? filter_info->sink_caps : filter_info->src_caps);
GST_LOG_OBJECT (self, "Caps: %" GST_PTR_FORMAT, caps);
res =
gst_caps_can_intersect (direction ==
GST_PAD_SINK ? filter_info->sink_caps : filter_info->src_caps, caps);
GST_LOG_OBJECT (self, "Intersect result: %d", res);
return res;
}
static gboolean
sticky_event_push (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (user_data);
gst_event_ref (*event);
gst_pad_push_event (self->current_internal_srcpad, *event);
return TRUE;
}
static InternalPads *
gst_base_auto_convert_get_element_internal_pads (GstBaseAutoConvert * self,
GstElement * element)
{
InternalPads *pads;
GST_OBJECT_LOCK (self);
pads = g_hash_table_lookup (self->elements, element);
if (pads)
pads = internal_pads_ref (pads);
GST_OBJECT_UNLOCK (self);
return pads;
}
static gboolean
gst_base_auto_convert_activate_element (GstBaseAutoConvert * self,
GstElement * element, GstCaps * caps)
{
gboolean res = TRUE;
GstPad *sinkpad = NULL, *srcpad = NULL;
GstPadLinkReturn padlinkret;
GstElement *current_subelement = NULL;
InternalPads *pads =
gst_base_auto_convert_get_element_internal_pads (self, element);
g_assert (pads);
if (caps) {
/* check if the element can really accept said caps */
if (!gst_pad_peer_query_accept_caps (pads->src, caps)) {
GST_DEBUG_OBJECT (self, "Could not set %s:%s to %"
GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (pads->src), caps);
goto error;
}
}
current_subelement = gst_base_auto_convert_get_subelement (self);
gst_element_set_locked_state (element, FALSE);
if (!gst_bin_add (GST_BIN (self), element)) {
GST_ERROR_OBJECT (self, "Could not add element %s to the bin",
GST_OBJECT_NAME (element));
goto error;
}
if (!gst_element_sync_state_with_parent (element)) {
GST_WARNING_OBJECT (self, "Could sync %" GST_PTR_FORMAT " state", element);
goto error;
}
srcpad = get_pad_by_direction (element, GST_PAD_SRC);
if (!srcpad) {
GST_ERROR_OBJECT (self, "Could not find source in %s",
GST_OBJECT_NAME (element));
goto error;
}
sinkpad = get_pad_by_direction (element, GST_PAD_SINK);
if (!sinkpad) {
GST_ERROR_OBJECT (self, "Could not find sink in %s",
GST_OBJECT_NAME (element));
goto error;
}
gst_pad_set_active (pads->sink, TRUE);
gst_pad_set_active (pads->src, TRUE);
padlinkret = gst_pad_link_full (pads->src, sinkpad,
GST_PAD_LINK_CHECK_NOTHING);
if (GST_PAD_LINK_FAILED (padlinkret)) {
GST_WARNING_OBJECT (self, "Could not links pad %s:%s to %s:%s"
" for reason %d",
GST_DEBUG_PAD_NAME (pads->src),
GST_DEBUG_PAD_NAME (sinkpad), padlinkret);
goto error;
}
padlinkret = gst_pad_link_full (srcpad, pads->sink,
GST_PAD_LINK_CHECK_NOTHING);
if (GST_PAD_LINK_FAILED (padlinkret)) {
GST_WARNING_OBJECT (self, "Could not links pad %s:%s to %s:%s"
" for reason %d",
GST_DEBUG_PAD_NAME (pads->src),
GST_DEBUG_PAD_NAME (sinkpad), padlinkret);
goto error;
}
GST_BASEAUTOCONVERT_LOCK (self);
gst_object_replace ((GstObject **) & self->current_subelement,
GST_OBJECT (element));
gst_object_replace ((GstObject **) & self->current_internal_srcpad,
GST_OBJECT (pads->src));
gst_object_replace ((GstObject **) & self->current_internal_sinkpad,
GST_OBJECT (pads->sink));
GST_BASEAUTOCONVERT_UNLOCK (self);
if (current_subelement) {
gst_element_set_locked_state (current_subelement, TRUE);
gst_element_set_state (current_subelement, GST_STATE_NULL);
gst_bin_remove (GST_BIN (self), current_subelement);
}
gst_pad_sticky_events_foreach (self->sinkpad, sticky_event_push, self);
gst_pad_push_event (self->sinkpad, gst_event_new_reconfigure ());
GST_INFO_OBJECT (self, "Selected element %s",
GST_OBJECT_NAME (GST_OBJECT (element)));
done:
GST_DEBUG_OBJECT (element, "Activating element %s",
res ? "succeeded" : "failed");
gst_object_unref (element);
internal_pads_unref (pads);
gst_clear_object (&srcpad);
gst_clear_object (&sinkpad);
gst_clear_object (&current_subelement);
return res;
error:
gst_element_set_locked_state (element, TRUE);
gst_element_set_state (element, GST_STATE_NULL);
if (GST_OBJECT_PARENT (element))
gst_bin_remove (GST_BIN (self), element);
res = FALSE;
goto done;
}
static GstIterator *
gst_base_auto_convert_iterate_internal_links (GstPad * pad, GstObject * parent)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
GstIterator *it = NULL;
GstPad *internal;
if (pad == self->sinkpad)
internal = gst_base_auto_convert_get_internal_srcpad (self);
else
internal = gst_base_auto_convert_get_internal_sinkpad (self);
if (internal) {
GValue val = { 0, };
g_value_init (&val, GST_TYPE_PAD);
g_value_take_object (&val, internal);
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
g_value_unset (&val);
}
return it;
}
static GstAutoConvertFilterInfo *
gst_auto_convert_get_filter_info (GstBaseAutoConvert * self,
GstElement * element)
{
GList *tmp;
for (tmp = self->filters_info; tmp; tmp = tmp->next) {
GstAutoConvertFilterInfo *filter_info = tmp->data;
if (!g_strcmp0 (filter_info->name, GST_OBJECT_NAME (element)))
return filter_info;
}
return NULL;
}
/*
* If there is already an internal element, it will try to call set_caps on it
*
* If there isn't an internal element or if the set_caps() on the internal
* element failed, it will try to find another element where it would succeed
* and will change the internal element.
*/
static gboolean
gst_base_auto_convert_sink_setcaps (GstBaseAutoConvert * self, GstCaps * caps,
gboolean check_downstream)
{
GList *tmp;
GstCaps *other_caps = NULL;
GList *filters_info = NULL;
GstCaps *current_caps = NULL;
gboolean res = FALSE;
GstElement *current_subelement = NULL;
g_return_val_if_fail (self != NULL, FALSE);
if (!check_downstream) {
current_caps = gst_pad_get_current_caps (self->sinkpad);
if (current_caps && gst_caps_is_equal_fixed (caps, current_caps)) {
res = TRUE;
goto get_out;
}
}
if (check_downstream)
other_caps = gst_pad_peer_query_caps (self->srcpad, NULL);
current_subelement = gst_base_auto_convert_get_subelement (self);
GST_DEBUG_OBJECT (self,
"'%" GST_PTR_FORMAT "' Setting caps to: %" GST_PTR_FORMAT
" - other caps: %" GST_PTR_FORMAT, current_subelement, caps, other_caps);
if (current_subelement) {
if (gst_pad_peer_query_accept_caps (self->current_internal_srcpad, caps)) {
GstAutoConvertFilterInfo *filter_info =
gst_auto_convert_get_filter_info (self, current_subelement);
res = TRUE;
if (other_caps) {
GST_DEBUG_OBJECT (self,
"Checking if known bin %s can intersect with %" GST_PTR_FORMAT,
filter_info->name, other_caps);
if (!filter_info_can_intersect (self, filter_info, GST_PAD_SRC,
other_caps)) {
GST_LOG_OBJECT (self,
"filter_info %s does not accept src caps %" GST_PTR_FORMAT,
filter_info->name, other_caps);
res = FALSE;
}
GST_DEBUG_OBJECT (self, "Filter %s can intersect", filter_info->name);
}
if (res) {
/* If we can set the new caps on the current element,
* then we just get out
*/
GST_DEBUG_OBJECT (self,
"Could set %s:%s to %" GST_PTR_FORMAT " reusing %s",
GST_DEBUG_PAD_NAME (self->current_internal_srcpad), caps,
filter_info->name);
goto get_out;
} else {
GST_DEBUG_OBJECT (self,
"Can't reuse currently configured subelement: %s",
filter_info->name);
}
}
}
if (!check_downstream)
other_caps = gst_pad_peer_query_caps (self->srcpad, NULL);
/* We already queried downstream caps otherwise */
filters_info = gst_base_auto_convert_get_or_load_filters_info (self);
for (tmp = filters_info; tmp; tmp = g_list_next (tmp)) {
GstAutoConvertFilterInfo *filter_info = tmp->data;
GstElement *element;
GST_DEBUG_OBJECT (self, "Trying %s (bin_desc=%s)", filter_info->name,
filter_info->bindesc);
/* Lets first check if according to the static pad templates on the known bin
* these caps have any chance of success
*/
if (!filter_info_can_intersect (self, filter_info, GST_PAD_SINK, caps)) {
GST_DEBUG_OBJECT (self, "Known bin %s does not accept sink caps %"
GST_PTR_FORMAT, filter_info->name, caps);
continue;
}
if (other_caps != NULL) {
if (!filter_info_can_intersect (self, filter_info, GST_PAD_SRC,
other_caps)) {
GST_DEBUG_OBJECT (self,
"Known bin %s does not accept src caps %" GST_PTR_FORMAT,
filter_info->name, other_caps);
continue;
}
GST_DEBUG_OBJECT (self, "Filter %s can intersect", filter_info->name);
}
/* The element had a chance of success, lets make it */
GST_DEBUG_OBJECT (self, "Trying bin %s", filter_info->name);
element =
gst_base_auto_convert_get_or_make_element_from_filter_info (self,
filter_info);
if (!element)
continue;
/* And make it the current child */
if (gst_base_auto_convert_activate_element (self, element, caps)) {
res = TRUE;
break;
}
}
get_out:
gst_clear_object (&current_subelement);
gst_clear_caps (&other_caps);
gst_clear_caps (&current_caps);
if (!res) {
GST_WARNING_OBJECT (self,
"Could not find a matching element for caps: %" GST_PTR_FORMAT, caps);
}
return res;
}
/*
* This function filters the pad pad templates, taking only transform element
* (with one sink and one src pad)
*/
static gboolean
gst_base_auto_convert_default_filter_func (GstPluginFeature * feature,
gpointer user_data)
{
GstElementFactory *factory = NULL;
const GList *static_pad_templates, *tmp;
GstStaticPadTemplate *src = NULL, *sink = NULL;
if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
factory = GST_ELEMENT_FACTORY (feature);
static_pad_templates = gst_element_factory_get_static_pad_templates (factory);
for (tmp = static_pad_templates; tmp; tmp = g_list_next (tmp)) {
GstStaticPadTemplate *template = tmp->data;
GstCaps *caps;
if (template->presence == GST_PAD_SOMETIMES)
return FALSE;
if (template->presence != GST_PAD_ALWAYS)
continue;
switch (template->direction) {
case GST_PAD_SRC:
if (src)
return FALSE;
src = template;
break;
case GST_PAD_SINK:
if (sink)
return FALSE;
sink = template;
break;
default:
return FALSE;
}
caps = gst_static_pad_template_get_caps (template);
if (gst_caps_is_any (caps) || gst_caps_is_empty (caps))
return FALSE;
}
if (!src || !sink)
return FALSE;
return TRUE;
}
/* function used to sort element features
* Copy-pasted from decodebin */
static gint
compare_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;
rname1 = gst_plugin_feature_get_name (f1);
rname2 = gst_plugin_feature_get_name (f2);
diff = strcmp (rname2, rname1);
return diff;
}
static GList *
gst_base_auto_convert_get_or_load_filters_info (GstBaseAutoConvert * self)
{
GList *all_factories;
GST_OBJECT_LOCK (self);
if (self->filters_info) {
GST_OBJECT_UNLOCK (self);
goto done;
}
if (GST_BASE_AUTO_CONVERT_GET_CLASS (self)->registers_filters) {
GST_ERROR_OBJECT (self,
"Filters should have been registered but none found");
GST_ELEMENT_ERROR (self, CORE, MISSING_PLUGIN, ("No known filter found."),
(NULL));
goto done;
}
if (!self->factories) {
GST_OBJECT_UNLOCK (self);
all_factories =
g_list_sort (gst_registry_feature_filter (gst_registry_get (),
gst_base_auto_convert_default_filter_func, FALSE, NULL),
(GCompareFunc) compare_ranks);
GST_OBJECT_LOCK (self);
self->factories = all_factories;
}
GST_OBJECT_UNLOCK (self);
for (GList * tmp = self->factories; tmp; tmp = g_list_next (tmp)) {
GstElementFactory *factory = tmp->data;
gst_base_auto_convert_register_filter (self,
gst_object_get_name (GST_OBJECT (factory)),
gst_object_get_name (GST_OBJECT (factory)),
gst_plugin_feature_get_rank (GST_PLUGIN_FEATURE (factory))
);
}
done:
return self->filters_info;
}
/* In this case, we should almost always have an internal element, because
* set_caps() should have been called first
*/
static GstFlowReturn
gst_base_auto_convert_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
if (gst_pad_check_reconfigure (self->srcpad)) {
GstCaps *sinkcaps = gst_pad_get_current_caps (pad);
GST_INFO_OBJECT (parent, "Needs reconfigure.");
/* if we need to reconfigure we pretend new caps arrived. This
* will reconfigure the transform with the new output format. */
if (sinkcaps && !gst_base_auto_convert_sink_setcaps (self, sinkcaps, TRUE)) {
gst_clear_caps (&sinkcaps);
GST_ERROR_OBJECT (self, "Could not reconfigure.");
return GST_FLOW_NOT_NEGOTIATED;
}
gst_clear_caps (&sinkcaps);
}
if (self->current_internal_srcpad) {
ret = gst_pad_push (self->current_internal_srcpad, buffer);
if (ret != GST_FLOW_OK)
GST_DEBUG_OBJECT (self,
"Child element %" GST_PTR_FORMAT "returned flow %s",
self->current_subelement, gst_flow_get_name (ret));
} else {
GST_ERROR_OBJECT (self, "Got buffer without an negotiated element,"
" returning not-negotiated");
gst_buffer_unref (buffer);
}
return ret;
}
static GstFlowReturn
gst_base_auto_convert_sink_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * list)
{
GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
if (self->current_internal_srcpad) {
ret = gst_pad_push_list (self->current_internal_srcpad, list);
if (ret != GST_FLOW_OK)
GST_DEBUG_OBJECT (self,
"Child element %" GST_PTR_FORMAT "returned flow %s",
self->current_subelement, gst_flow_get_name (ret));
} else {
GST_ERROR_OBJECT (self, "Got buffer without an negotiated element,"
" returning not-negotiated");
gst_buffer_list_unref (list);
}
return ret;
}
static gboolean
gst_base_auto_convert_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
GstPad *internal_srcpad;
if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) {
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_base_auto_convert_sink_setcaps (self, caps, FALSE);
if (!ret) {
gst_event_unref (event);
return ret;
}
}
internal_srcpad = gst_base_auto_convert_get_internal_srcpad (self);
if (internal_srcpad) {
ret = gst_pad_push_event (internal_srcpad, event);
gst_object_unref (internal_srcpad);
} else {
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (self->srcpad, event);
break;
default:
gst_event_unref (event);
ret = TRUE;
break;
}
}
return ret;
}
/* TODO Properly test that this code works well for queries */
static gboolean
gst_base_auto_convert_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean ret = TRUE;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
GstElement *subelement;
if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_base_auto_convert_getcaps (self, filter, GST_PAD_SINK);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
return TRUE;
}
subelement = gst_base_auto_convert_get_subelement (self);
if (subelement) {
GstPad *sub_sinkpad = get_pad_by_direction (subelement, GST_PAD_SINK);
ret = gst_pad_query (sub_sinkpad, query);
gst_object_unref (sub_sinkpad);
gst_object_unref (subelement);
if (ret && GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
gboolean res;
gst_query_parse_accept_caps_result (query, &res);
if (!res)
goto ignore_acceptcaps_failure;
}
return ret;
}
/* Should not forward the allocation query downstream directly
* if no subelement is selected, otherwise it can influence
* the downstream allocation choices and upstream buffer usage.
*/
if (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION) {
GST_DEBUG_OBJECT (self,
"no subelement is selected yet, can't answer ALLOCATION query");
return FALSE;
}
ignore_acceptcaps_failure:
if (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
GstCaps *caps;
GstCaps *accept_caps;
gst_query_parse_accept_caps (query, &accept_caps);
caps = gst_base_auto_convert_getcaps (self, accept_caps, GST_PAD_SINK);
gst_query_set_accept_caps_result (query,
gst_caps_can_intersect (caps, accept_caps));
gst_caps_unref (caps);
return TRUE;
}
GST_WARNING_OBJECT (self, "Got query %s while no element was"
" selected, letting through",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
return gst_pad_peer_query (self->srcpad, query);
}
/**
* gst_base_auto_convert_getcaps:
* @pad: the sink #GstPad
*
* This function returns the union of the caps of all the possible element
* factories, based on the static pad templates.
* It also checks does a getcaps on the downstream element and ignores all
* factories whose static caps can not satisfy it.
*
* It does not try to use each elements getcaps() function
*/
static GstCaps *
gst_base_auto_convert_getcaps (GstBaseAutoConvert * self, GstCaps * filter,
GstPadDirection dir)
{
GstCaps *caps = NULL, *other_caps = NULL;
GList *kb, *filters_info;
caps = gst_caps_new_empty ();
if (dir == GST_PAD_SINK)
other_caps = gst_pad_peer_query_caps (self->srcpad, NULL);
else
other_caps = gst_pad_peer_query_caps (self->sinkpad, NULL);
GST_DEBUG_OBJECT (self,
"Finding elements that can fit with src caps %" GST_PTR_FORMAT,
other_caps);
if (other_caps && gst_caps_is_empty (other_caps)) {
goto out;
}
filters_info = gst_base_auto_convert_get_or_load_filters_info (self);
for (kb = filters_info; kb; kb = g_list_next (kb)) {
GstAutoConvertFilterInfo *filter_info = kb->data;
GstElement *element = NULL;
GstCaps *element_caps;
InternalPads *pads;
if (filter) {
if (!filter_info_can_intersect (self, filter_info, dir, filter)) {
GST_LOG_OBJECT (self,
"Bin %s does not accept %s caps %" GST_PTR_FORMAT,
filter_info->name, dir == GST_PAD_SRC ? "src" : "sink", other_caps);
continue;
}
}
if (other_caps != NULL) {
if (!filter_info_can_intersect (self, filter_info,
dir == GST_PAD_SINK ? GST_PAD_SRC : GST_PAD_SINK, other_caps)) {
GST_LOG_OBJECT (self,
"%s does not accept %s caps %" GST_PTR_FORMAT,
filter_info->name,
dir == GST_PAD_SINK ? "src" : "sink", other_caps);
continue;
}
element =
gst_base_auto_convert_get_or_make_element_from_filter_info (self,
filter_info);
if (element == NULL)
continue;
pads = gst_base_auto_convert_get_element_internal_pads (self, element);
element_caps =
gst_pad_peer_query_caps ((dir ==
GST_PAD_SINK) ? pads->src : pads->sink, filter);
internal_pads_unref (pads);
if (element_caps)
caps = gst_caps_merge (caps, element_caps);
gst_object_unref (element);
/* Early out, any is absorbing */
if (gst_caps_is_any (caps))
goto out;
} else {
GstCaps *static_caps =
dir == GST_PAD_SRC ? filter_info->src_caps : filter_info->sink_caps;
if (static_caps) {
caps = gst_caps_merge (caps, static_caps);
}
/* Early out, any is absorbing */
if (gst_caps_is_any (caps))
goto out;
}
}
out:
GST_DEBUG_OBJECT (self, "Returning unioned caps %" GST_PTR_FORMAT, caps);
if (other_caps)
gst_caps_unref (other_caps);
return caps;
}
static gboolean
gst_base_auto_convert_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = TRUE;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
GstPad *internal_sinkpad;
if (GST_EVENT_TYPE (event) == GST_EVENT_RECONFIGURE)
gst_pad_push_event (self->sinkpad, gst_event_ref (event));
internal_sinkpad = gst_base_auto_convert_get_internal_sinkpad (self);
if (internal_sinkpad) {
ret = gst_pad_push_event (internal_sinkpad, event);
gst_object_unref (internal_sinkpad);
} else if (GST_EVENT_TYPE (event) != GST_EVENT_RECONFIGURE) {
GST_WARNING_OBJECT (self,
"Got upstream event while no element was selected, forwarding.");
ret = gst_pad_push_event (self->sinkpad, event);
} else
gst_event_unref (event);
return ret;
}
/* TODO Properly test that this code works well for queries */
static gboolean
gst_base_auto_convert_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean ret = TRUE;
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT (parent);
GstElement *subelement;
if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_base_auto_convert_getcaps (self, filter, GST_PAD_SRC);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
return TRUE;
}
subelement = gst_base_auto_convert_get_subelement (self);
if (subelement) {
GstPad *sub_srcpad = get_pad_by_direction (subelement, GST_PAD_SRC);
ret = gst_pad_query (sub_srcpad, query);
gst_object_unref (sub_srcpad);
gst_object_unref (subelement);
} else {
GST_WARNING_OBJECT (self,
"Got upstream query of type %s while no element was selected,"
" forwarding.", gst_query_type_get_name (GST_QUERY_TYPE (query)));
ret = gst_pad_peer_query (self->sinkpad, query);
}
return ret;
}
static GstFlowReturn
gst_base_auto_convert_internal_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
return gst_pad_push (self->srcpad, buffer);
}
static GstFlowReturn
gst_base_auto_convert_internal_sink_chain_list (GstPad * pad,
GstObject * parent, GstBufferList * list)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
return gst_pad_push_list (self->srcpad, list);
}
static gboolean
gst_base_auto_convert_internal_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
gboolean drop = FALSE;
GST_BASEAUTOCONVERT_LOCK (self);
if (self->current_internal_sinkpad != pad) {
drop = TRUE;
}
GST_BASEAUTOCONVERT_UNLOCK (self);
if (drop) {
gst_event_unref (event);
return TRUE;
}
return gst_pad_push_event (self->srcpad, event);
}
static gboolean
gst_base_auto_convert_internal_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
if (!gst_pad_peer_query (self->srcpad, query)) {
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter;
gst_query_parse_caps (query, &filter);
if (filter) {
gst_query_set_caps_result (query, filter);
} else {
filter = gst_caps_new_any ();
gst_query_set_caps_result (query, filter);
gst_caps_unref (filter);
}
return TRUE;
}
case GST_QUERY_ACCEPT_CAPS:
gst_query_set_accept_caps_result (query, TRUE);
return TRUE;
default:
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_base_auto_convert_internal_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
gboolean drop = FALSE;
GST_BASEAUTOCONVERT_LOCK (self);
if (self->current_internal_srcpad != pad) {
drop = TRUE;
}
GST_BASEAUTOCONVERT_UNLOCK (self);
if (drop) {
GST_DEBUG_OBJECT (self, "Dropping event %" GST_PTR_FORMAT, event);
gst_event_unref (event);
return TRUE;
}
return gst_pad_push_event (self->sinkpad, event);
}
static gboolean
gst_base_auto_convert_internal_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstBaseAutoConvert *self = GST_BASE_AUTO_CONVERT_PAD (pad)->obj;
return gst_pad_peer_query (self->sinkpad, query);
}
void
gst_base_auto_convert_reset_filters (GstBaseAutoConvert * self)
{
GST_OBJECT_LOCK (self);
g_list_free_full (self->filters_info,
(GDestroyNotify) gst_auto_convert_filter_info_free);
self->filters_info = NULL;
GST_OBJECT_UNLOCK (self);
}
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