mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-24 09:10:36 +00:00
Code Issues 1 Projects Releases Wiki Activity

gst/playback/: Fix playback of multiple files. a slightly different approach to handling dynamic pad removals.

Browse source 
Original commit message from CVS:
* gst/playback/gstdecodebin.c: (gst_decode_bin_class_init),
(try_to_link_1), (get_our_ghost_pad), (remove_element_chain),
(unlinked), (no_more_pads), (close_link):
* gst/playback/gstplaybasebin.c: (gst_play_base_bin_init),
(unknown_type), (add_element_stream), (new_decoded_pad),
(removed_decoded_pad), (setup_source):
* gst/playback/gststreaminfo.c: (gst_stream_info_get_type),
(gst_stream_info_class_init), (gst_stream_info_init),
(gst_stream_info_new), (gst_stream_info_dispose),
(stream_info_mute_pad), (gst_stream_info_set_property),
(gst_stream_info_get_property):
* gst/playback/gststreaminfo.h:
Fix playback of multiple files.
a slightly different approach to handling dynamic pad removals.
This one only looks at pads that we have linked.
This commit is contained in:
Wim Taymans 2004-11-02 10:30:36 +00:00
parent 229ab4a80c
commit 9b23e6f57f
5 changed files with 205 additions and 130 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
ChangeLog
View file

@ -1,3 +1,21 @@
2004-11-02 Wim Taymans <wim@fluendo.com>
* gst/playback/gstdecodebin.c: (gst_decode_bin_class_init),
(try_to_link_1), (get_our_ghost_pad), (remove_element_chain),
(unlinked), (no_more_pads), (close_link):
* gst/playback/gstplaybasebin.c: (gst_play_base_bin_init),
(unknown_type), (add_element_stream), (new_decoded_pad),
(removed_decoded_pad), (setup_source):
* gst/playback/gststreaminfo.c: (gst_stream_info_get_type),
(gst_stream_info_class_init), (gst_stream_info_init),
(gst_stream_info_new), (gst_stream_info_dispose),
(stream_info_mute_pad), (gst_stream_info_set_property),
(gst_stream_info_get_property):
* gst/playback/gststreaminfo.h:
Fix playback of multiple files.
a slightly different approach to handling dynamic pad removals.
This one only looks at pads that we have linked.
2004-11-01 Christophe Fergeau <teuf@gnome.org>
* ext/ogg/gstoggdemux.c: (gst_ogg_demux_finalize): fix an "invalid

252
gst/playback/gstdecodebin.c
View file

@ -74,10 +74,10 @@ struct _GstDecodeBinClass
/* signal we fire when a new pad has been decoded into raw audio/video */
void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last);
/* signal we fire when a pad has been removed */
void (*removed_decoded_pad) (GstElement * element, GstPad * pad);
/* signal fired when we found a pad that we cannot decode */
void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);
/* called on dynamic pad removal */
void (*removed_decoded_pad) (GstElement * element, GstPad * pad);
};
/* props */
@ -91,8 +91,8 @@ enum
enum
{
SIGNAL_NEW_DECODED_PAD,
SIGNAL_UNKNOWN_TYPE,
SIGNAL_REMOVED_DECODED_PAD,
SIGNAL_UNKNOWN_TYPE,
LAST_SIGNAL
};
@ -101,6 +101,7 @@ enum
typedef struct
{
gint np_sig_id; /* signal id of new_pad */
gint unlink_sig_id; /* signal id of unlinked */
gint nmp_sig_id; /* signal id of no_more_pads */
GstElement *element; /* the element sending the signal */
GstDecodeBin *decode_bin; /* pointer to ourself */
@ -124,6 +125,8 @@ static GstElement *try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad,
static void close_link (GstElement * element, GstDecodeBin * decode_bin);
static void close_pad_link (GstElement * element, GstPad * pad,
GstCaps * caps, GstDecodeBin * decode_bin, gboolean more);
static void unlinked (GstPad * pad, GstPad * peerpad,
GstDecodeBin * decode_bin);
static GstElementClass *parent_class;
static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 };
@ -189,16 +192,16 @@ gst_decode_bin_class_init (GstDecodeBinClass * klass)
G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL,
gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, G_TYPE_OBJECT,
G_TYPE_BOOLEAN);
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] =
g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] =
g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type),
NULL, NULL, gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] =
g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL,
g_cclosure_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose);
@ -464,7 +467,7 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
/* make an element from the factory first */
element = gst_element_factory_create (factory, NULL);
if (element == NULL) {
/* hmm, strange */
/* hmm, strange. Like with all things in live, let's move on.. */
GST_WARNING_OBJECT (decode_bin, "could not create an element from %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
continue;
@ -474,6 +477,7 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
GST_DEBUG_OBJECT (decode_bin, "adding %s", gst_element_get_name (element));
gst_bin_add (GST_BIN (decode_bin), element);
/* set to ready first so it can do negotiation */
gst_element_set_state (element, GST_STATE_READY);
/* keep out own list of elements */
@ -486,6 +490,10 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
if (ret) {
const gchar *klass;
GstElementFactory *factory;
guint sig;
GST_DEBUG_OBJECT (decode_bin, "linked on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
/* The link worked, now figure out what it was that we connected */
factory = gst_element_get_factory (element);
@ -496,6 +504,11 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
/* FIXME, do something with threads here */
}
}
/* make sure we catch unlink signals */
sig = g_signal_connect (G_OBJECT (pad), "unlinked",
G_CALLBACK (unlinked), decode_bin);
/* keep a ref to the signal id so that we can disconnect the signal callback */
g_object_set_data (G_OBJECT (pad), "unlinked_id", GINT_TO_POINTER (sig));
/* now that we added the element we can try to continue autoplugging
* on it until we have a raw type */
@ -504,6 +517,8 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
gst_element_sync_state_with_parent (element);
return element;
} else {
GST_DEBUG_OBJECT (decode_bin, "link failed on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
/* this element did not work, remove it again and continue trying
* other elements */
gst_bin_remove (GST_BIN (decode_bin), element);
@ -512,6 +527,115 @@ try_to_link_1 (GstDecodeBin * decode_bin, GstPad * pad, GList * factories)
return NULL;
}
static GstPad *
get_our_ghost_pad (GstDecodeBin * decode_bin, GstPad * pad)
{
GList *ghostpads;
if (pad == NULL || !GST_PAD_IS_SRC (pad)) {
GST_DEBUG_OBJECT (decode_bin, "pad NULL or not SRC pad");
return NULL;
}
if (GST_IS_GHOST_PAD (pad)) {
GstElement *parent = gst_pad_get_parent (pad);
GST_DEBUG_OBJECT (decode_bin, "pad parent %s",
gst_element_get_name (parent));
if (parent == GST_ELEMENT (decode_bin)) {
GST_DEBUG_OBJECT (decode_bin, "pad is our ghostpad");
return pad;
} else {
GST_DEBUG_OBJECT (decode_bin, "pad is ghostpad but not ours");
return NULL;
}
}
GST_DEBUG_OBJECT (decode_bin, "looping over ghostpads");
ghostpads = gst_pad_get_ghost_pad_list (pad);
while (ghostpads) {
GstPad *ghostpad;
ghostpad = get_our_ghost_pad (decode_bin, GST_PAD (ghostpads->data));
if (ghostpad)
return ghostpad;
ghostpads = g_list_next (ghostpads);
}
GST_DEBUG_OBJECT (decode_bin, "done looping over ghostpads, nothing found");
return NULL;
}
/* remove all downstream elements starting from the given pad.
* Also make sure to remove the ghostpad we created for the raw
* decoded stream.
*/
static void
remove_element_chain (GstDecodeBin * decode_bin, GstPad * pad)
{
GList *int_links;
GstElement *elem = gst_pad_get_parent (pad);
GST_DEBUG_OBJECT (decode_bin, "%s:%s", GST_DEBUG_PAD_NAME (pad));
/* remove all elements linked to this pad up to the ghostpad
* that we created for this stream */
for (int_links = gst_pad_get_internal_links (pad);
int_links; int_links = g_list_next (int_links)) {
GstPad *pad;
GstPad *ghostpad;
GstPad *peer;
pad = GST_PAD (int_links->data);
GST_DEBUG_OBJECT (decode_bin, "inspecting internal pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
ghostpad = get_our_ghost_pad (decode_bin, pad);
if (ghostpad) {
GST_DEBUG_OBJECT (decode_bin, "found our ghost pad %s:%s for %s:%s",
GST_DEBUG_PAD_NAME (ghostpad), GST_DEBUG_PAD_NAME (pad));
g_signal_emit (G_OBJECT (decode_bin),
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD], 0, ghostpad);
gst_element_remove_pad (GST_ELEMENT (decode_bin), ghostpad);
continue;
} else {
GST_DEBUG_OBJECT (decode_bin, "not one of our ghostpads");
}
peer = gst_pad_get_peer (pad);
if (peer == NULL)
continue;
GST_DEBUG_OBJECT (decode_bin, "internal pad %s:%s linked to pad %s:%s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer));
if (gst_pad_get_real_parent (peer) != GST_ELEMENT (decode_bin)) {
GST_DEBUG_OBJECT (decode_bin, "dead end pad %s:%s",
GST_DEBUG_PAD_NAME (peer));
} else {
GST_DEBUG_OBJECT (decode_bin, "recursing element %s on pad %s:%s",
gst_element_get_name (elem), GST_DEBUG_PAD_NAME (pad));
remove_element_chain (decode_bin, peer);
}
}
GST_DEBUG_OBJECT (decode_bin, "removing %s", gst_element_get_name (elem));
gst_bin_remove (GST_BIN (decode_bin), elem);
}
/* This function will be called when a pad is disconnected for some reason */
static void
unlinked (GstPad * pad, GstPad * peerpad, GstDecodeBin * decode_bin)
{
/* inactivate pad */
gst_pad_set_active (pad, FALSE);
/* remove all elements linked to the peerpad */
remove_element_chain (decode_bin, peerpad);
}
/* This function will be called when a dynamic pad is created on an element.
* We try to continue autoplugging on this new pad. */
static void
@ -547,7 +671,7 @@ no_more_pads (GstElement * element, GstDynamic * dynamic)
decode_bin->dynamics = g_list_remove (decode_bin->dynamics, dynamic);
g_free (dynamic);
/* if we have no more dynamic elements, we have no change of creating
/* if we have no more dynamic elements, we have no chance of creating
* more pads, so we fire the no_more_pads signal */
if (decode_bin->dynamics == NULL) {
GST_DEBUG_OBJECT (decode_bin,
@ -558,110 +682,6 @@ no_more_pads (GstElement * element, GstDynamic * dynamic)
}
}
/* get unconnected element (after unlink/pad-remove). */
static GstElement *
get_unconnected_element (GstDecodeBin * decode_bin)
{
const GList *walk;
for (walk = gst_bin_get_list (GST_BIN (decode_bin));
walk != NULL; walk = walk->next) {
GstElement *element = walk->data;
const GList *pwalk;
for (pwalk = gst_element_get_pad_list (GST_ELEMENT (element));
pwalk != NULL; pwalk = pwalk->next) {
GstPad *pad = pwalk->data;
if (GST_PAD_IS_SINK (pad) && GST_PAD_PEER (pad) == NULL)
return element;
}
}
return NULL;
}
/* remove all elements linked forward from this element on from the bin */
static void
remove_starting_from (GstDecodeBin * decode_bin, GstElement * start)
{
const GList *pwalk;
for (pwalk = gst_element_get_pad_list (start);
pwalk != NULL; pwalk = pwalk->next) {
GstPad *pad = pwalk->data;
if (GST_PAD_IS_SRC (pad)) {
GstPad *peer = GST_PAD_PEER (pad);
GstElement *peer_parent = NULL;
if (peer)
peer_parent = gst_pad_get_parent (peer);
/* be recursive */
if (peer_parent != NULL) {
if (gst_object_get_parent (GST_OBJECT (peer_parent))
== GST_OBJECT (decode_bin)) {
remove_starting_from (decode_bin, peer_parent);
} else {
/* linked outside us - signal pad removal */
g_signal_emit (decode_bin,
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD], 0, pad);
}
}
}
}
/* now remove ourselves */
gst_bin_remove (GST_BIN (decode_bin), start);
}
/* This function will be called for elements with dynamic elements when
* they remove pads. This might just be because they're disposed, in
* which case we don't care. It might also be because they're changing
* chain, in which case we want to re-plug afterwards. */
static void
pad_removed (GstElement * element, GstPad * pad, GstDecodeBin * decode_bin)
{
GList *walk;
GstElement *peer;
GstDynamic *dyn;
/* don't care about disposal - it's really only for replugging.
* We only need to check for pending is ready because if pending
* is NULL, then state is READY. */
if (GST_STATE (element) <= GST_STATE_READY ||
GST_STATE_PENDING (element) == GST_STATE_READY)
return;
/* clean up. FIXME: getting peer of removed pad is dirty. */
peer = get_unconnected_element (decode_bin);
g_assert (peer);
remove_starting_from (decode_bin, peer);
/* if an element removes two pads, then we don't want this twice */
for (walk = decode_bin->dynamics; walk != NULL; walk = walk->next) {
dyn = walk->data;
if (dyn->element == element)
return;
}
GST_DEBUG_OBJECT (decode_bin, "pad removal while alive - chained?");
/* re-setup dynamic plugging */
dyn = g_new0 (GstDynamic, 1);
dyn->np_sig_id = g_signal_connect (G_OBJECT (element), "new-pad",
G_CALLBACK (new_pad), dyn);
dyn->nmp_sig_id = g_signal_connect (G_OBJECT (element), "no-more-pads",
G_CALLBACK (no_more_pads), dyn);
dyn->element = element;
dyn->decode_bin = decode_bin;
/* and add this element to the dynamic elements */
decode_bin->dynamics = g_list_prepend (decode_bin->dynamics, dyn);
}
/* this function inspects the given element and tries to connect something
* on the srcpads. If there are dynamic pads, it sets up a signal handler to
* continue autoplugging when they become available */
@ -751,10 +771,6 @@ close_link (GstElement * element, GstDecodeBin * decode_bin)
/* and add this element to the dynamic elements */
decode_bin->dynamics = g_list_prepend (decode_bin->dynamics, dyn);
/* let's keep this one around longer than the lifetime of dynamicity */
g_signal_connect (G_OBJECT (element), "pad-removed",
G_CALLBACK (pad_removed), decode_bin);
}
/* Check if this is an element with more than 1 pad. If this element

61
gst/playback/gstplaybasebin.c
View file

@ -166,7 +166,6 @@ static void
gst_play_base_bin_init (GstPlayBaseBin * play_base_bin)
{
play_base_bin->uri = NULL;
play_base_bin->threaded = FALSE;
play_base_bin->need_rebuild = TRUE;
play_base_bin->source = NULL;
play_base_bin->decoder = NULL;
@ -282,6 +281,7 @@ unknown_type (GstElement * element, GstPad * pad, GstCaps * caps,
/* add the stream to the list */
info = gst_stream_info_new (GST_OBJECT (pad), GST_STREAM_TYPE_UNKNOWN,
NULL, caps);
info->origin = GST_OBJECT (pad);
play_base_bin->streaminfo = g_list_append (play_base_bin->streaminfo, info);
g_free (capsstr);
@ -301,6 +301,7 @@ add_element_stream (GstElement * element, GstPlayBaseBin * play_base_bin)
info =
gst_stream_info_new (GST_OBJECT (element), GST_STREAM_TYPE_ELEMENT,
NULL, NULL);
info->origin = GST_OBJECT (element);
play_base_bin->streaminfo = g_list_append (play_base_bin->streaminfo, info);
}
@ -393,6 +394,7 @@ new_decoded_pad (GstElement * element, GstPad * pad, gboolean last,
/* add the stream to the list */
info = gst_stream_info_new (GST_OBJECT (srcpad), type, NULL, caps);
info->origin = GST_OBJECT (pad);
play_base_bin->streaminfo = g_list_append (play_base_bin->streaminfo, info);
/* signal the no more pads after adding the stream */
@ -400,6 +402,35 @@ new_decoded_pad (GstElement * element, GstPad * pad, gboolean last,
no_more_pads (NULL, play_base_bin);
}
/* signal fired when decodebin has removed a raw pad. We remove
* the preroll element if needed and the appropriate streaminfo.
*/
static void
removed_decoded_pad (GstElement * element, GstPad * pad,
GstPlayBaseBin * play_base_bin)
{
GList *streams;
GST_DEBUG ("removing decoded pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* first find the stream to decode this pad */
streams = play_base_bin->streaminfo;
while (streams) {
GstStreamInfo *info = GST_STREAM_INFO (streams->data);
if (info->origin == GST_OBJECT (pad)) {
GST_DEBUG ("removing stream %p", info);
play_base_bin->streaminfo =
g_list_remove (play_base_bin->streaminfo, info);
g_object_unref (info);
return;
} else {
GST_DEBUG ("skipping stream %p", info);
}
streams = g_list_next (streams);
}
}
/*
* Cache errors...
*/
@ -448,6 +479,8 @@ setup_source (GstPlayBaseBin * play_base_bin, GError ** error)
if (!play_base_bin->need_rebuild)
return TRUE;
play_base_bin->threaded = FALSE;
/* keep ref to old souce in case creating the new source fails */
old_src = play_base_bin->source;
@ -537,7 +570,7 @@ setup_source (GstPlayBaseBin * play_base_bin, GError ** error)
{
gboolean res;
gint sig1, sig2, sig3, sig4, sig5;
gint sig1, sig2, sig3, sig4, sig5, sig6;
/* now create the decoder element */
play_base_bin->decoder = gst_element_factory_make ("decodebin", "decoder");
@ -559,11 +592,13 @@ setup_source (GstPlayBaseBin * play_base_bin, GError ** error)
}
sig1 = g_signal_connect (G_OBJECT (play_base_bin->decoder),
"new-decoded-pad", G_CALLBACK (new_decoded_pad), play_base_bin);
sig2 = g_signal_connect (G_OBJECT (play_base_bin->decoder), "no-more-pads",
sig2 = g_signal_connect (G_OBJECT (play_base_bin->decoder),
"removed-decoded-pad", G_CALLBACK (removed_decoded_pad), play_base_bin);
sig3 = g_signal_connect (G_OBJECT (play_base_bin->decoder), "no-more-pads",
G_CALLBACK (no_more_pads), play_base_bin);
sig3 = g_signal_connect (G_OBJECT (play_base_bin->decoder), "unknown-type",
sig4 = g_signal_connect (G_OBJECT (play_base_bin->decoder), "unknown-type",
G_CALLBACK (unknown_type), play_base_bin);
sig4 = g_signal_connect (G_OBJECT (play_base_bin->thread), "error",
sig5 = g_signal_connect (G_OBJECT (play_base_bin->thread), "error",
G_CALLBACK (thread_error), error);
/* either when the queues are filled or when the decoder element has no more
@ -575,7 +610,7 @@ setup_source (GstPlayBaseBin * play_base_bin, GError ** error)
GList *prerolls;
GST_DEBUG ("waiting for preroll...");
sig5 = g_signal_connect (G_OBJECT (play_base_bin->thread),
sig6 = g_signal_connect (G_OBJECT (play_base_bin->thread),
"state-change", G_CALLBACK (state_change), play_base_bin);
g_cond_wait (play_base_bin->preroll_cond, play_base_bin->preroll_lock);
GST_DEBUG ("preroll done !");
@ -595,16 +630,18 @@ setup_source (GstPlayBaseBin * play_base_bin, GError ** error)
}
} else {
GST_DEBUG ("state change failed, media cannot be loaded");
sig5 = 0;
sig6 = 0;
}
g_mutex_unlock (play_base_bin->preroll_lock);
if (sig5 != 0)
g_signal_handler_disconnect (G_OBJECT (play_base_bin->thread), sig5);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->thread), sig4);
if (sig6 != 0)
g_signal_handler_disconnect (G_OBJECT (play_base_bin->thread), sig6);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->thread), sig5);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig4);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig3);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig2);
g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig1);
//g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig2);
//g_signal_handler_disconnect (G_OBJECT (play_base_bin->decoder), sig1);
play_base_bin->need_rebuild = FALSE;
}

3
gst/playback/gststreaminfo.c
View file

@ -147,6 +147,7 @@ static void
gst_stream_info_init (GstStreamInfo * stream_info)
{
stream_info->object = NULL;
stream_info->origin = NULL;
stream_info->type = GST_STREAM_TYPE_UNKNOWN;
stream_info->decoder = NULL;
stream_info->mute = FALSE;
@ -165,6 +166,7 @@ gst_stream_info_new (GstObject * object,
info->object = object;
info->type = type;
info->decoder = g_strdup (decoder);
info->origin = object;
if (caps) {
info->caps = gst_caps_copy (caps);
}
@ -181,6 +183,7 @@ gst_stream_info_dispose (GObject * object)
gst_object_unref (stream_info->object);
stream_info->object = NULL;
stream_info->origin = NULL;
stream_info->type = GST_STREAM_TYPE_UNKNOWN;
g_free (stream_info->decoder);
stream_info->decoder = NULL;

1
gst/playback/gststreaminfo.h
View file

@ -49,6 +49,7 @@ struct _GstStreamInfo {
GstStreamType type;
gchar *decoder;
gboolean mute;
GstObject *origin;
GstCaps *caps;
};