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gstreamer/gst/autoconvert/gstautoconvert.c
Nicolas Dufresne 416728f213 autoconvert: Fix lock-less exchange or free condition 
Before this change, we would free the list we just have saved.

Fixes #1158
2019-12-19 22:35:18 +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.
*/
/**
* SECTION:element-autoconvert
* @title: autoconvert
*
* The #autoconvert element has one sink and one source pad. It will look for
* other elements that also have one sink and one source pad.
* It will then pick an element that matches the caps on both sides.
* If the caps change, it may change the selected element if the current one
* no longer matches the caps.
*
* The list of element it will look into can be specified in the
* #GstAutoConvert:factories property, otherwise it will look at all available
* elements.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstautoconvert.h"
#include <string.h>
GST_DEBUG_CATEGORY (autoconvert_debug);
#define GST_CAT_DEFAULT (autoconvert_debug)
#define GST_AUTOCONVERT_LOCK(ac) GST_OBJECT_LOCK (ac)
#define GST_AUTOCONVERT_UNLOCK(ac) GST_OBJECT_UNLOCK (ac)
/* 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);
static GstStaticPadTemplate sink_internal_template =
GST_STATIC_PAD_TEMPLATE ("sink_internal",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate src_internal_template =
GST_STATIC_PAD_TEMPLATE ("src_internal",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/* GstAutoConvert signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_FACTORIES
};
static void gst_auto_convert_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_auto_convert_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_auto_convert_dispose (GObject * object);
static GstElement *gst_auto_convert_get_subelement (GstAutoConvert *
autoconvert);
static GstPad *gst_auto_convert_get_internal_sinkpad (GstAutoConvert *
autoconvert);
static GstPad *gst_auto_convert_get_internal_srcpad (GstAutoConvert *
autoconvert);
static GstIterator *gst_auto_convert_iterate_internal_links (GstPad * pad,
GstObject * parent);
static gboolean gst_auto_convert_sink_setcaps (GstAutoConvert * autoconvert,
GstCaps * caps);
static GstCaps *gst_auto_convert_getcaps (GstAutoConvert * autoconvert,
GstCaps * filter, GstPadDirection dir);
static GstFlowReturn gst_auto_convert_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstFlowReturn gst_auto_convert_sink_chain_list (GstPad * pad,
GstObject * parent, GstBufferList * list);
static gboolean gst_auto_convert_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_auto_convert_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_auto_convert_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_auto_convert_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstFlowReturn gst_auto_convert_internal_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static GstFlowReturn gst_auto_convert_internal_sink_chain_list (GstPad * pad,
GstObject * parent, GstBufferList * list);
static gboolean gst_auto_convert_internal_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_auto_convert_internal_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static gboolean gst_auto_convert_internal_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_auto_convert_internal_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GList *gst_auto_convert_load_factories (GstAutoConvert * autoconvert);
static GstElement
* gst_auto_convert_get_or_make_element_from_factory (GstAutoConvert *
autoconvert, GstElementFactory * factory);
static gboolean gst_auto_convert_activate_element (GstAutoConvert * autoconvert,
GstElement * element, GstCaps * caps);
static GQuark internal_srcpad_quark = 0;
static GQuark internal_sinkpad_quark = 0;
static GQuark parent_quark = 0;
G_DEFINE_TYPE (GstAutoConvert, gst_auto_convert, GST_TYPE_BIN);
static void
gst_auto_convert_class_init (GstAutoConvertClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GST_DEBUG_CATEGORY_INIT (autoconvert_debug, "autoconvert", 0,
"Auto convert based on caps");
internal_srcpad_quark = g_quark_from_static_string ("internal_srcpad");
internal_sinkpad_quark = g_quark_from_static_string ("internal_sinkpad");
parent_quark = g_quark_from_static_string ("parent");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class,
"Select converter based on caps", "Generic/Bin",
"Selects the right transform element based on the caps",
"Olivier Crete <olivier.crete@collabora.com>");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_auto_convert_dispose);
gobject_class->set_property = gst_auto_convert_set_property;
gobject_class->get_property = gst_auto_convert_get_property;
g_object_class_install_property (gobject_class, PROP_FACTORIES,
g_param_spec_pointer ("factories",
"GList of GstElementFactory",
"GList of GstElementFactory objects to pick from (the element takes"
" ownership of the list (NULL means it will go through all possible"
" elements), can only be set once",
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_auto_convert_init (GstAutoConvert * autoconvert)
{
autoconvert->sinkpad =
gst_pad_new_from_static_template (&sinktemplate, "sink");
autoconvert->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_chain_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_sink_chain));
gst_pad_set_chain_list_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_sink_chain_list));
gst_pad_set_event_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_sink_event));
gst_pad_set_query_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_sink_query));
gst_pad_set_iterate_internal_links_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_iterate_internal_links));
gst_pad_set_event_function (autoconvert->srcpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_src_event));
gst_pad_set_query_function (autoconvert->srcpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_src_query));
gst_pad_set_iterate_internal_links_function (autoconvert->sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_iterate_internal_links));
gst_element_add_pad (GST_ELEMENT (autoconvert), autoconvert->sinkpad);
gst_element_add_pad (GST_ELEMENT (autoconvert), autoconvert->srcpad);
}
static void
gst_auto_convert_dispose (GObject * object)
{
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object);
g_clear_object (&autoconvert->current_subelement);
g_clear_object (&autoconvert->current_internal_sinkpad);
g_clear_object (&autoconvert->current_internal_srcpad);
for (;;) {
GList *factories = g_atomic_pointer_get (&autoconvert->factories);
if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories,
factories, NULL)) {
gst_plugin_feature_list_free (factories);
break;
}
}
G_OBJECT_CLASS (gst_auto_convert_parent_class)->dispose (object);
}
static void
gst_auto_convert_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case PROP_FACTORIES:
if (g_atomic_pointer_get (&autoconvert->factories) == NULL) {
GList *factories = g_value_get_pointer (value);
factories = g_list_copy (factories);
if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories,
NULL, factories))
g_list_foreach (factories, (GFunc) g_object_ref, NULL);
else
g_list_free (factories);
} else {
GST_WARNING_OBJECT (object, "Can not reset factories after they"
" have been set or auto-discovered");
}
break;
}
}
static void
gst_auto_convert_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case PROP_FACTORIES:
g_value_set_pointer (value,
g_atomic_pointer_get (&autoconvert->factories));
break;
}
}
static GstElement *
gst_auto_convert_get_element_by_type (GstAutoConvert * autoconvert, GType type)
{
GList *item;
GstBin *bin = GST_BIN (autoconvert);
GstElement *element = NULL;
g_return_val_if_fail (type != 0, NULL);
GST_OBJECT_LOCK (autoconvert);
for (item = bin->children; item; item = item->next) {
if (G_TYPE_CHECK_INSTANCE_TYPE (item->data, type)) {
element = gst_object_ref (item->data);
break;
}
}
GST_OBJECT_UNLOCK (autoconvert);
return element;
}
/**
* 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_auto_convert_get_subelement (GstAutoConvert * autoconvert)
{
GstElement *element = NULL;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_subelement)
element = gst_object_ref (autoconvert->current_subelement);
GST_AUTOCONVERT_UNLOCK (autoconvert);
return element;
}
static GstPad *
gst_auto_convert_get_internal_sinkpad (GstAutoConvert * autoconvert)
{
GstPad *pad = NULL;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_internal_sinkpad)
pad = gst_object_ref (autoconvert->current_internal_sinkpad);
GST_AUTOCONVERT_UNLOCK (autoconvert);
return pad;
}
static GstPad *
gst_auto_convert_get_internal_srcpad (GstAutoConvert * autoconvert)
{
GstPad *pad = NULL;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_internal_srcpad)
pad = gst_object_ref (autoconvert->current_internal_srcpad);
GST_AUTOCONVERT_UNLOCK (autoconvert);
return pad;
}
/*
* This function creates and adds an element to the GstAutoConvert
* it then creates the internal pads and links them
*
*/
static GstElement *
gst_auto_convert_add_element (GstAutoConvert * autoconvert,
GstElementFactory * factory)
{
GstElement *element = NULL;
GstPad *internal_sinkpad = NULL;
GstPad *internal_srcpad = NULL;
GstPad *sinkpad = NULL;
GstPad *srcpad = NULL;
GstPadLinkReturn padlinkret;
GST_DEBUG_OBJECT (autoconvert, "Adding element %s to the autoconvert bin",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
element = gst_element_factory_create (factory, NULL);
if (!element)
return NULL;
if (!gst_bin_add (GST_BIN (autoconvert), element)) {
GST_ERROR_OBJECT (autoconvert, "Could not add element %s to the bin",
GST_OBJECT_NAME (element));
gst_object_unref (element);
return NULL;
}
srcpad = get_pad_by_direction (element, GST_PAD_SRC);
if (!srcpad) {
GST_ERROR_OBJECT (autoconvert, "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 (autoconvert, "Could not find sink in %s",
GST_OBJECT_NAME (element));
goto error;
}
internal_sinkpad =
gst_pad_new_from_static_template (&sink_internal_template,
"sink_internal");
internal_srcpad =
gst_pad_new_from_static_template (&src_internal_template, "src_internal");
if (!internal_sinkpad || !internal_srcpad) {
GST_ERROR_OBJECT (autoconvert, "Could not create internal pads");
if (internal_srcpad)
gst_object_unref (internal_srcpad);
if (internal_sinkpad)
gst_object_unref (internal_sinkpad);
goto error;
}
g_object_weak_ref (G_OBJECT (element), (GWeakNotify) gst_object_unref,
internal_sinkpad);
g_object_weak_ref (G_OBJECT (element), (GWeakNotify) gst_object_unref,
internal_srcpad);
gst_pad_set_active (internal_sinkpad, TRUE);
gst_pad_set_active (internal_srcpad, TRUE);
g_object_set_qdata (G_OBJECT (internal_srcpad), parent_quark, autoconvert);
g_object_set_qdata (G_OBJECT (internal_sinkpad), parent_quark, autoconvert);
gst_pad_set_chain_function (internal_sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_chain));
gst_pad_set_chain_list_function (internal_sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_chain_list));
gst_pad_set_event_function (internal_sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_event));
gst_pad_set_query_function (internal_sinkpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_sink_query));
gst_pad_set_event_function (internal_srcpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_src_event));
gst_pad_set_query_function (internal_srcpad,
GST_DEBUG_FUNCPTR (gst_auto_convert_internal_src_query));
padlinkret = gst_pad_link_full (internal_srcpad, sinkpad,
GST_PAD_LINK_CHECK_NOTHING);
if (GST_PAD_LINK_FAILED (padlinkret)) {
GST_WARNING_OBJECT (autoconvert, "Could not links pad %s:%s to %s:%s"
" for reason %d",
GST_DEBUG_PAD_NAME (internal_srcpad),
GST_DEBUG_PAD_NAME (sinkpad), padlinkret);
goto error;
}
padlinkret = gst_pad_link_full (srcpad, internal_sinkpad,
GST_PAD_LINK_CHECK_NOTHING);
if (GST_PAD_LINK_FAILED (padlinkret)) {
GST_WARNING_OBJECT (autoconvert, "Could not links pad %s:%s to %s:%s"
" for reason %d",
GST_DEBUG_PAD_NAME (internal_srcpad),
GST_DEBUG_PAD_NAME (sinkpad), padlinkret);
goto error;
}
g_object_set_qdata (G_OBJECT (element),
internal_srcpad_quark, internal_srcpad);
g_object_set_qdata (G_OBJECT (element),
internal_sinkpad_quark, internal_sinkpad);
/* Iffy */
gst_element_sync_state_with_parent (element);
/* Increment the reference count we will return to the caller */
gst_object_ref (element);
/* unref sink and src pad */
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
return element;
error:
gst_element_set_locked_state (element, TRUE);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (autoconvert), element);
if (srcpad)
gst_object_unref (srcpad);
if (sinkpad)
gst_object_unref (sinkpad);
return NULL;
}
static GstElement *
gst_auto_convert_get_or_make_element_from_factory (GstAutoConvert * autoconvert,
GstElementFactory * factory)
{
GstElement *element = NULL;
GstElementFactory *loaded_factory =
GST_ELEMENT_FACTORY (gst_plugin_feature_load (GST_PLUGIN_FEATURE
(factory)));
if (!loaded_factory)
return NULL;
element = gst_auto_convert_get_element_by_type (autoconvert,
gst_element_factory_get_element_type (loaded_factory));
if (!element) {
element = gst_auto_convert_add_element (autoconvert, loaded_factory);
}
gst_object_unref (loaded_factory);
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, otherwise, its FALSE
*/
static gboolean
factory_can_intersect (GstAutoConvert * autoconvert,
GstElementFactory * factory, GstPadDirection direction, GstCaps * caps)
{
const GList *templates;
gint has_direction = FALSE;
gboolean ret = FALSE;
g_return_val_if_fail (factory != NULL, FALSE);
g_return_val_if_fail (caps != NULL, FALSE);
templates = gst_element_factory_get_static_pad_templates (factory);
while (templates) {
GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
if (template->direction == direction) {
GstCaps *tmpl_caps = NULL;
gboolean intersect;
/* If there is more than one pad in this direction, we return FALSE
* Only transform elements (with one sink and one source pad)
* are accepted
*/
if (has_direction) {
GST_DEBUG_OBJECT (autoconvert, "Factory %p"
" has more than one static template with dir %d",
template, direction);
return FALSE;
}
has_direction = TRUE;
tmpl_caps = gst_static_caps_get (&template->static_caps);
intersect = gst_caps_can_intersect (tmpl_caps, caps);
GST_DEBUG_OBJECT (autoconvert, "Factories %" GST_PTR_FORMAT
" static caps %" GST_PTR_FORMAT " and caps %" GST_PTR_FORMAT
" can%s intersect", factory, tmpl_caps, caps,
intersect ? "" : " not");
gst_caps_unref (tmpl_caps);
ret |= intersect;
}
templates = g_list_next (templates);
}
return ret;
}
static gboolean
sticky_event_push (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (user_data);
gst_event_ref (*event);
gst_pad_push_event (autoconvert->current_internal_srcpad, *event);
return TRUE;
}
static gboolean
gst_auto_convert_activate_element (GstAutoConvert * autoconvert,
GstElement * element, GstCaps * caps)
{
GstPad *internal_srcpad = g_object_get_qdata (G_OBJECT (element),
internal_srcpad_quark);
GstPad *internal_sinkpad = g_object_get_qdata (G_OBJECT (element),
internal_sinkpad_quark);
if (caps) {
/* check if the element can really accept said caps */
if (!gst_pad_peer_query_accept_caps (internal_srcpad, caps)) {
GST_DEBUG_OBJECT (autoconvert, "Could not set %s:%s to %"
GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (internal_srcpad), caps);
return FALSE;
}
}
GST_AUTOCONVERT_LOCK (autoconvert);
gst_object_replace ((GstObject **) & autoconvert->current_subelement,
GST_OBJECT (element));
gst_object_replace ((GstObject **) & autoconvert->current_internal_srcpad,
GST_OBJECT (internal_srcpad));
gst_object_replace ((GstObject **) & autoconvert->current_internal_sinkpad,
GST_OBJECT (internal_sinkpad));
GST_AUTOCONVERT_UNLOCK (autoconvert);
gst_pad_sticky_events_foreach (autoconvert->sinkpad, sticky_event_push,
autoconvert);
gst_pad_push_event (autoconvert->sinkpad, gst_event_new_reconfigure ());
GST_INFO_OBJECT (autoconvert, "Selected element %s",
GST_OBJECT_NAME (GST_OBJECT (element)));
gst_object_unref (element);
return TRUE;
}
static GstIterator *
gst_auto_convert_iterate_internal_links (GstPad * pad, GstObject * parent)
{
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
GstIterator *it = NULL;
GstPad *internal;
if (pad == autoconvert->sinkpad)
internal = gst_auto_convert_get_internal_srcpad (autoconvert);
else
internal = gst_auto_convert_get_internal_sinkpad (autoconvert);
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;
}
/*
* 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_auto_convert_sink_setcaps (GstAutoConvert * autoconvert, GstCaps * caps)
{
GList *elem;
GstCaps *other_caps = NULL;
GList *factories;
GstCaps *current_caps;
g_return_val_if_fail (autoconvert != NULL, FALSE);
current_caps = gst_pad_get_current_caps (autoconvert->sinkpad);
if (current_caps) {
if (gst_caps_is_equal_fixed (caps, current_caps)) {
gst_caps_unref (current_caps);
return TRUE;
}
gst_caps_unref (current_caps);
}
if (autoconvert->current_subelement) {
if (gst_pad_peer_query_accept_caps (autoconvert->current_internal_srcpad,
caps)) {
/* If we can set the new caps on the current element,
* then we just get out
*/
GST_DEBUG_OBJECT (autoconvert, "Could set %s:%s to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (autoconvert->current_internal_srcpad), caps);
goto get_out;
} else {
/* If the current element doesn't work,
* then we remove the current element before finding a new one.
*/
GST_AUTOCONVERT_LOCK (autoconvert);
g_clear_object (&autoconvert->current_subelement);
g_clear_object (&autoconvert->current_internal_sinkpad);
g_clear_object (&autoconvert->current_internal_srcpad);
GST_AUTOCONVERT_UNLOCK (autoconvert);
}
}
other_caps = gst_pad_peer_query_caps (autoconvert->srcpad, NULL);
factories = g_atomic_pointer_get (&autoconvert->factories);
if (!factories)
factories = gst_auto_convert_load_factories (autoconvert);
for (elem = factories; elem; elem = g_list_next (elem)) {
GstElementFactory *factory = GST_ELEMENT_FACTORY (elem->data);
GstElement *element;
/* Lets first check if according to the static pad templates on the factory
* these caps have any chance of success
*/
if (!factory_can_intersect (autoconvert, factory, GST_PAD_SINK, caps)) {
GST_LOG_OBJECT (autoconvert, "Factory %s does not accept sink caps %"
GST_PTR_FORMAT,
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)), caps);
continue;
}
if (other_caps != NULL) {
if (!factory_can_intersect (autoconvert, factory, GST_PAD_SRC,
other_caps)) {
GST_LOG_OBJECT (autoconvert,
"Factory %s does not accept src caps %" GST_PTR_FORMAT,
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)),
other_caps);
continue;
}
}
/* The element had a chance of success, lets make it */
element =
gst_auto_convert_get_or_make_element_from_factory (autoconvert,
factory);
if (!element)
continue;
/* And make it the current child */
if (gst_auto_convert_activate_element (autoconvert, element, caps))
break;
else
gst_object_unref (element);
}
get_out:
if (other_caps)
gst_caps_unref (other_caps);
if (autoconvert->current_subelement) {
return TRUE;
} else {
GST_WARNING_OBJECT (autoconvert,
"Could not find a matching element for caps");
return FALSE;
}
}
/*
* This function filters the pad pad templates, taking only transform element
* (with one sink and one src pad)
*/
static gboolean
gst_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_auto_convert_load_factories (GstAutoConvert * autoconvert)
{
GList *all_factories;
all_factories =
gst_registry_feature_filter (gst_registry_get (),
gst_auto_convert_default_filter_func, FALSE, NULL);
all_factories = g_list_sort (all_factories, (GCompareFunc) compare_ranks);
g_assert (all_factories);
if (!g_atomic_pointer_compare_and_exchange (&autoconvert->factories, NULL,
all_factories)) {
gst_plugin_feature_list_free (all_factories);
}
return g_atomic_pointer_get (&autoconvert->factories);
}
/* In this case, we should almost always have an internal element, because
* set_caps() should have been called first
*/
static GstFlowReturn
gst_auto_convert_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
if (autoconvert->current_internal_srcpad) {
ret = gst_pad_push (autoconvert->current_internal_srcpad, buffer);
if (ret != GST_FLOW_OK)
GST_DEBUG_OBJECT (autoconvert,
"Child element %" GST_PTR_FORMAT "returned flow %s",
autoconvert->current_subelement, gst_flow_get_name (ret));
} else {
GST_ERROR_OBJECT (autoconvert, "Got buffer without an negotiated element,"
" returning not-negotiated");
gst_buffer_unref (buffer);
}
return ret;
}
static GstFlowReturn
gst_auto_convert_sink_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * list)
{
GstFlowReturn ret = GST_FLOW_NOT_NEGOTIATED;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
if (autoconvert->current_internal_srcpad) {
ret = gst_pad_push_list (autoconvert->current_internal_srcpad, list);
if (ret != GST_FLOW_OK)
GST_DEBUG_OBJECT (autoconvert,
"Child element %" GST_PTR_FORMAT "returned flow %s",
autoconvert->current_subelement, gst_flow_get_name (ret));
} else {
GST_ERROR_OBJECT (autoconvert, "Got buffer without an negotiated element,"
" returning not-negotiated");
gst_buffer_list_unref (list);
}
return ret;
}
static gboolean
gst_auto_convert_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret = TRUE;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
GstPad *internal_srcpad;
if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) {
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_auto_convert_sink_setcaps (autoconvert, caps);
if (!ret) {
gst_event_unref (event);
return ret;
}
}
internal_srcpad = gst_auto_convert_get_internal_srcpad (autoconvert);
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 (autoconvert->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_auto_convert_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean ret = TRUE;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
GstElement *subelement;
if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_auto_convert_getcaps (autoconvert, filter, GST_PAD_SINK);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
return TRUE;
}
subelement = gst_auto_convert_get_subelement (autoconvert);
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;
}
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_auto_convert_getcaps (autoconvert, 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 (autoconvert, "Got query %s while no element was"
" selected, letting through",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
return gst_pad_peer_query (autoconvert->srcpad, query);
}
/**
* gst_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_auto_convert_getcaps (GstAutoConvert * autoconvert, GstCaps * filter,
GstPadDirection dir)
{
GstCaps *caps = NULL, *other_caps = NULL;
GList *elem, *factories;
caps = gst_caps_new_empty ();
if (dir == GST_PAD_SINK)
other_caps = gst_pad_peer_query_caps (autoconvert->srcpad, NULL);
else
other_caps = gst_pad_peer_query_caps (autoconvert->sinkpad, NULL);
GST_DEBUG_OBJECT (autoconvert,
"Lets find all the element that can fit here with src caps %"
GST_PTR_FORMAT, other_caps);
if (other_caps && gst_caps_is_empty (other_caps)) {
goto out;
}
factories = g_atomic_pointer_get (&autoconvert->factories);
if (!factories)
factories = gst_auto_convert_load_factories (autoconvert);
for (elem = factories; elem; elem = g_list_next (elem)) {
GstElementFactory *factory = GST_ELEMENT_FACTORY (elem->data);
GstElement *element = NULL;
GstCaps *element_caps;
GstPad *internal_pad = NULL;
if (filter) {
if (!factory_can_intersect (autoconvert, factory, dir, filter)) {
GST_LOG_OBJECT (autoconvert,
"Factory %s does not accept src caps %" GST_PTR_FORMAT,
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)),
other_caps);
continue;
}
}
if (other_caps != NULL) {
if (!factory_can_intersect (autoconvert, factory,
dir == GST_PAD_SINK ? GST_PAD_SRC : GST_PAD_SINK, other_caps)) {
GST_LOG_OBJECT (autoconvert,
"Factory %s does not accept src caps %" GST_PTR_FORMAT,
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)),
other_caps);
continue;
}
element = gst_auto_convert_get_or_make_element_from_factory (autoconvert,
factory);
if (element == NULL)
continue;
if (dir == GST_PAD_SINK)
internal_pad = g_object_get_qdata (G_OBJECT (element),
internal_srcpad_quark);
else
internal_pad = g_object_get_qdata (G_OBJECT (element),
internal_sinkpad_quark);
element_caps = gst_pad_peer_query_caps (internal_pad, filter);
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 {
const GList *tmp;
for (tmp = gst_element_factory_get_static_pad_templates (factory);
tmp; tmp = g_list_next (tmp)) {
GstStaticPadTemplate *template = tmp->data;
if (GST_PAD_TEMPLATE_DIRECTION (template) == dir) {
GstCaps *static_caps = gst_static_pad_template_get_caps (template);
if (static_caps) {
caps = gst_caps_merge (caps, static_caps);
}
/* Early out, any is absorbing */
if (gst_caps_is_any (caps))
goto out;
}
}
}
}
GST_DEBUG_OBJECT (autoconvert, "Returning unioned caps %" GST_PTR_FORMAT,
caps);
out:
if (other_caps)
gst_caps_unref (other_caps);
return caps;
}
static gboolean
gst_auto_convert_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret = TRUE;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
GstPad *internal_sinkpad;
if (GST_EVENT_TYPE (event) == GST_EVENT_RECONFIGURE)
gst_pad_push_event (autoconvert->sinkpad, gst_event_ref (event));
internal_sinkpad = gst_auto_convert_get_internal_sinkpad (autoconvert);
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 (autoconvert,
"Got upstream event while no element was selected," "forwarding.");
ret = gst_pad_push_event (autoconvert->sinkpad, event);
} else
gst_event_unref (event);
return ret;
}
/* TODO Properly test that this code works well for queries */
static gboolean
gst_auto_convert_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean ret = TRUE;
GstAutoConvert *autoconvert = GST_AUTO_CONVERT (parent);
GstElement *subelement;
if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_auto_convert_getcaps (autoconvert, filter, GST_PAD_SRC);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
return TRUE;
}
subelement = gst_auto_convert_get_subelement (autoconvert);
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 (autoconvert,
"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 (autoconvert->sinkpad, query);
}
return ret;
}
static GstFlowReturn
gst_auto_convert_internal_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
return gst_pad_push (autoconvert->srcpad, buffer);
}
static GstFlowReturn
gst_auto_convert_internal_sink_chain_list (GstPad * pad, GstObject * parent,
GstBufferList * list)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
return gst_pad_push_list (autoconvert->srcpad, list);
}
static gboolean
gst_auto_convert_internal_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
gboolean drop = FALSE;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_internal_sinkpad != pad) {
drop = TRUE;
}
GST_AUTOCONVERT_UNLOCK (autoconvert);
if (drop) {
gst_event_unref (event);
return TRUE;
}
return gst_pad_push_event (autoconvert->srcpad, event);
}
static gboolean
gst_auto_convert_internal_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
if (!gst_pad_peer_query (autoconvert->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_auto_convert_internal_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
gboolean drop = FALSE;
GST_AUTOCONVERT_LOCK (autoconvert);
if (autoconvert->current_internal_srcpad != pad) {
drop = TRUE;
}
GST_AUTOCONVERT_UNLOCK (autoconvert);
if (drop) {
GST_DEBUG_OBJECT (autoconvert, "Dropping event %" GST_PTR_FORMAT, event);
gst_event_unref (event);
return TRUE;
}
return gst_pad_push_event (autoconvert->sinkpad, event);
}
static gboolean
gst_auto_convert_internal_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstAutoConvert *autoconvert =
GST_AUTO_CONVERT (g_object_get_qdata (G_OBJECT (pad),
parent_quark));
return gst_pad_peer_query (autoconvert->sinkpad, query);
}
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