mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-07-01 20:30:41 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/gstpad.c
Wim Taymans 6cacf76cd9 Added GstBin test. 
Original commit message from CVS:
Added GstBin test.
Added GstSystemClock test.
Implemented clock distribution code in GstBin.
Implemented iterate sinks method for future use.
Rearranged gstelement.h
Fix GstIterator comparison bug.
Moved some code to GstPipeline, mostly clocking related.
2005-03-09 16:10:59 +00:00

4343 lines
120 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstpad.c: Pads for linking elements together
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gst_private.h"
#include "gstpad.h"
#include "gstmarshal.h"
#include "gstutils.h"
#include "gstelement.h"
#include "gstbin.h"
#include "gstscheduler.h"
#include "gstevent.h"
#include "gstinfo.h"
#include "gsterror.h"
#include "gstvalue.h"
GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
#define DEBUG_DATA(obj,data,notice) G_STMT_START{\
if (!data) { \
GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "NULL data value"); \
} else if (GST_IS_EVENT (data)) { \
GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "%s event %p (type %d, refcount %d)", notice, data, \
GST_EVENT_TYPE (data), GST_DATA_REFCOUNT_VALUE (data)); \
} else { \
GST_CAT_LOG_OBJECT (debug_dataflow, obj, "%s buffer %p (size %u, refcount %d)", notice, data, \
GST_BUFFER_SIZE (data), GST_BUFFER_REFCOUNT_VALUE (data)); \
} \
}G_STMT_END
#define GST_CAT_DEFAULT GST_CAT_PADS
/* realize and pad and grab the lock of the realized pad. */
#define GST_PAD_REALIZE_AND_LOCK(pad, realpad, lost_ghostpad) \
GST_LOCK (pad); \
realpad = GST_PAD_REALIZE (pad); \
if (G_UNLIKELY (realpad == NULL)) { \
GST_UNLOCK (pad); \
goto lost_ghostpad; \
} \
if (G_UNLIKELY (pad != GST_PAD_CAST (realpad))) { \
GST_LOCK (realpad); \
GST_UNLOCK (pad); \
}
struct _GstPadLink
{
GType type;
gboolean bla;
gboolean srcnotify;
gboolean sinknotify;
GstPad *srcpad;
GstPad *sinkpad;
GstCaps *srccaps;
GstCaps *sinkcaps;
GstCaps *filtercaps;
GstCaps *caps;
GstPadFixateFunction app_fixate;
gboolean engaged;
GstData *temp_store; /* used only when we invented a DISCONT */
};
enum
{
TEMPL_PAD_CREATED,
/* FILL ME */
TEMPL_LAST_SIGNAL
};
static GstObject *padtemplate_parent_class = NULL;
static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 };
GType _gst_pad_type = 0;
/***** Start with the base GstPad class *****/
static void gst_pad_class_init (GstPadClass * klass);
static void gst_pad_init (GstPad * pad);
static void gst_pad_dispose (GObject * object);
static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
static GstCaps *_gst_pad_default_fixate_func (GstPad * pad,
const GstCaps * caps);
static gboolean gst_pad_link_try (GstPadLink * link);
static void gst_pad_link_free (GstPadLink * link);
#ifndef GST_DISABLE_LOADSAVE
static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent);
#endif
static GstObject *pad_parent_class = NULL;
GType
gst_pad_get_type (void)
{
if (!_gst_pad_type) {
static const GTypeInfo pad_info = {
sizeof (GstPadClass), NULL, NULL,
(GClassInitFunc) gst_pad_class_init, NULL, NULL,
sizeof (GstPad),
0,
(GInstanceInitFunc) gst_pad_init, NULL
};
_gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad",
&pad_info, 0);
GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW",
GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads");
}
return _gst_pad_type;
}
static void
gst_pad_class_init (GstPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose);
}
static void
gst_pad_init (GstPad * pad)
{
/* all structs are initialized to NULL by glib */
}
static void
gst_pad_dispose (GObject * object)
{
GstPad *pad = GST_PAD (object);
gst_pad_set_pad_template (pad, NULL);
/* FIXME, we have links to many other things like caps
* and the peer pad... */
G_OBJECT_CLASS (pad_parent_class)->dispose (object);
}
/***** Then do the Real Pad *****/
/* Pad signals and args */
enum
{
REAL_LINKED,
REAL_UNLINKED,
REAL_FIXATE,
/* FILL ME */
REAL_LAST_SIGNAL
};
enum
{
REAL_ARG_0,
REAL_ARG_CAPS,
REAL_ARG_ACTIVE
/* FILL ME */
};
static void gst_real_pad_class_init (GstRealPadClass * klass);
static void gst_real_pad_init (GstRealPad * pad);
static void gst_real_pad_dispose (GObject * object);
static void gst_real_pad_finalize (GObject * object);
static gboolean _gst_real_pad_fixate_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy);
static void gst_real_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_real_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
GType _gst_real_pad_type = 0;
static GstPad *real_pad_parent_class = NULL;
static guint gst_real_pad_signals[REAL_LAST_SIGNAL] = { 0 };
GType
gst_real_pad_get_type (void)
{
if (!_gst_real_pad_type) {
static const GTypeInfo pad_info = {
sizeof (GstRealPadClass), NULL, NULL,
(GClassInitFunc) gst_real_pad_class_init, NULL, NULL,
sizeof (GstRealPad),
0,
(GInstanceInitFunc) gst_real_pad_init, NULL
};
_gst_real_pad_type = g_type_register_static (GST_TYPE_PAD, "GstRealPad",
&pad_info, 0);
}
return _gst_real_pad_type;
}
static void
gst_real_pad_class_init (GstRealPadClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
real_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_real_pad_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_real_pad_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_real_pad_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_real_pad_get_property);
gst_real_pad_signals[REAL_LINKED] =
g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, linked), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gst_real_pad_signals[REAL_UNLINKED] =
g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, unlinked), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gst_real_pad_signals[REAL_FIXATE] =
g_signal_new ("fixate", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRealPadClass, appfixatefunc),
_gst_real_pad_fixate_accumulator, NULL,
gst_marshal_BOXED__BOXED, GST_TYPE_CAPS, 1,
GST_TYPE_CAPS | G_SIGNAL_TYPE_STATIC_SCOPE);
g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_ACTIVE,
g_param_spec_boolean ("active", "Active", "Whether the pad is active.",
TRUE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), REAL_ARG_CAPS,
g_param_spec_boxed ("caps", "Caps", "The capabilities of the pad",
GST_TYPE_CAPS, G_PARAM_READABLE));
#ifndef GST_DISABLE_LOADSAVE
gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself);
#endif
gstobject_class->path_string_separator = ".";
}
static gboolean
_gst_real_pad_fixate_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
if (gst_value_get_caps (handler_return)) {
g_value_copy (handler_return, return_accu);
/* stop emission if something was returned */
return FALSE;
}
return TRUE;
}
static void
gst_real_pad_init (GstRealPad * pad)
{
pad->direction = GST_PAD_UNKNOWN;
pad->peer = NULL;
pad->chainfunc = NULL;
pad->getfunc = NULL;
pad->chainhandler = NULL;
pad->gethandler = NULL;
pad->ghostpads = NULL;
pad->caps = NULL;
pad->linkfunc = NULL;
pad->getcapsfunc = NULL;
pad->eventfunc = gst_pad_event_default;
pad->convertfunc = gst_pad_convert_default;
pad->queryfunc = gst_pad_query_default;
pad->intlinkfunc = gst_pad_get_internal_links_default;
pad->eventmaskfunc = gst_pad_get_event_masks_default;
pad->formatsfunc = gst_pad_get_formats_default;
pad->querytypefunc = gst_pad_get_query_types_default;
GST_FLAG_UNSET (pad, GST_PAD_ACTIVE);
GST_FLAG_UNSET (pad, GST_PAD_NEGOTIATING);
gst_probe_dispatcher_init (&pad->probedisp);
}
static void
gst_real_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
g_return_if_fail (GST_IS_PAD (object));
switch (prop_id) {
case REAL_ARG_ACTIVE:
gst_pad_set_active (GST_PAD (object), g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_real_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
g_return_if_fail (GST_IS_PAD (object));
switch (prop_id) {
case REAL_ARG_ACTIVE:
g_value_set_boolean (value, GST_FLAG_IS_SET (object, GST_PAD_ACTIVE));
break;
case REAL_ARG_CAPS:
g_value_set_boxed (value, GST_PAD_CAPS (GST_REAL_PAD (object)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* FIXME-0.9: Replace these custom functions with proper inheritance via _init
functions and object properties. update: probably later in the cycle. */
/**
* gst_pad_custom_new:
* @type: the #Gtype of the pad.
* @name: the name of the new pad.
* @direction: the #GstPadDirection of the pad.
*
* Creates a new pad with the given name and type in the given direction.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
* This function makes a copy of the name so you can safely free the name.
*
* Returns: a new #GstPad, or NULL in case of an error.
*
* MT safe.
*/
GstPad *
gst_pad_custom_new (GType type, const gchar * name, GstPadDirection direction)
{
GstRealPad *pad;
pad = g_object_new (type, NULL);
gst_object_set_name (GST_OBJECT (pad), name);
GST_RPAD_DIRECTION (pad) = direction;
return GST_PAD_CAST (pad);
}
/**
* gst_pad_new:
* @name: the name of the new pad.
* @direction: the #GstPadDirection of the pad.
*
* Creates a new real pad with the given name in the given direction.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
* This function makes a copy of the name so you can safely free the name.
*
* Returns: a new #GstPad, or NULL in case of an error.
*
* MT safe.
*/
GstPad *
gst_pad_new (const gchar * name, GstPadDirection direction)
{
return gst_pad_custom_new (gst_real_pad_get_type (), name, direction);
}
/**
* gst_pad_custom_new_from_template:
* @type: the custom #GType of the pad.
* @templ: the #GstPadTemplate to instantiate from.
* @name: the name of the new pad.
*
* Creates a new custom pad with the given name from the given template.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
* This function makes a copy of the name so you can safely free the name.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
GstPad *
gst_pad_custom_new_from_template (GType type, GstPadTemplate * templ,
const gchar * name)
{
GstPad *pad;
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
pad = gst_pad_custom_new (type, name, templ->direction);
gst_pad_set_pad_template (pad, templ);
return pad;
}
/**
* gst_pad_new_from_template:
* @templ: the pad template to use
* @name: the name of the element
*
* Creates a new real pad with the given name from the given template.
* If name is NULL, a guaranteed unique name (across all pads)
* will be assigned.
* This function makes a copy of the name so you can safely free the name.
*
* Returns: a new #GstPad, or NULL in case of an error.
*/
GstPad *
gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
{
return gst_pad_custom_new_from_template (gst_real_pad_get_type (),
templ, name);
}
/**
* gst_pad_get_direction:
* @pad: a #GstPad to get the direction of.
*
* Gets the direction of the pad. The direction of the pad is
* decided at construction time so this function does not take
* the LOCK.
*
* Returns: the #GstPadDirection of the pad.
*
* MT safe.
*/
GstPadDirection
gst_pad_get_direction (GstPad * pad)
{
GstPadDirection result;
/* pad unkown is a little silly but we need some sort of
* error return value */
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
/* since the direction cannot change at runtime we can
* safely read without locking. */
result = GST_PAD_DIRECTION (pad);
return result;
}
/**
* gst_pad_set_active:
* @pad: the #GstPad to activate or deactivate.
* @active: TRUE to activate the pad.
*
* Activates or deactivates the given pad.
*
* Returns: TRUE if the operation was successfull.
*/
gboolean
gst_pad_set_active (GstPad * pad, gboolean active)
{
GstRealPad *realpad;
gboolean old;
GstPadLink *link;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
old = GST_PAD_IS_ACTIVE (pad);
if (old == active)
return TRUE;
realpad = GST_PAD_REALIZE (pad);
if (active) {
GST_CAT_DEBUG (GST_CAT_PADS, "activating pad %s:%s",
GST_DEBUG_PAD_NAME (realpad));
GST_FLAG_SET (realpad, GST_PAD_ACTIVE);
} else {
GST_CAT_DEBUG (GST_CAT_PADS, "de-activating pad %s:%s",
GST_DEBUG_PAD_NAME (realpad));
GST_FLAG_UNSET (realpad, GST_PAD_ACTIVE);
}
link = GST_RPAD_LINK (realpad);
if (link) {
if (link->temp_store) {
GST_CAT_INFO (GST_CAT_PADS,
"deleting cached data %p from bufpen of pad %s:%s", link->temp_store,
GST_DEBUG_PAD_NAME (realpad));
gst_data_unref (link->temp_store);
link->temp_store = NULL;
}
}
g_object_notify (G_OBJECT (realpad), "active");
return TRUE;
}
/**
* gst_pad_set_active_recursive:
* @pad: the #GstPad to activate or deactivate.
* @active: TRUE to activate the pad.
*
* Activates or deactivates the given pad and all internally linked
* pads upstream until it finds an element with multiple source pads.
*/
void
gst_pad_set_active_recursive (GstPad * pad, gboolean active)
{
GstElement *parent;
const GList *int_links;
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_PAD_IS_SRC (pad));
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
"Recursively %s pad %s:%s", active ? "activating" : "deactivating",
GST_DEBUG_PAD_NAME (pad));
gst_pad_set_active (pad, active);
/* If we have more than one sourcepad, then the other pads should
* possibly be kept active. FIXME: maybe we should recurse
* activation if any one pad is active and recurse deactivation
* if no single pad is active? */
parent = gst_pad_get_parent (pad);
if (!parent || parent->numsrcpads > 1)
return;
for (int_links = gst_pad_get_internal_links (pad);
int_links; int_links = g_list_next (int_links)) {
GstPad *sinkpad = GST_PAD (int_links->data);
GstPad *peer = GST_PAD_PEER (sinkpad);
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, sinkpad,
"Recursing %s on pad %s:%s",
active ? "activation" : "deactivation", GST_DEBUG_PAD_NAME (sinkpad));
gst_pad_set_active (sinkpad, active);
if (peer)
gst_pad_set_active_recursive (peer, active);
}
}
/**
* gst_pad_is_active:
* @pad: the #GstPad to query
*
* Query if a pad is active
*
* Returns: TRUE if the pad is active.
*
* MT safe.
*/
gboolean
gst_pad_is_active (GstPad * pad)
{
gboolean result = FALSE;
GstRealPad *realpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad);
result = GST_FLAG_IS_SET (realpad, GST_PAD_ACTIVE);
GST_UNLOCK (realpad);
return result;
lost_ghostpad:
{
return FALSE;
}
}
/**
* gst_pad_set_chain_function:
* @pad: a real sink #GstPad.
* @chain: the #GstPadChainFunction to set.
*
* Sets the given chain function for the pad. The chain function is called to
* process a #GstBuffer input buffer.
*/
void
gst_pad_set_chain_function (GstPad * pad, GstPadChainFunction chain)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SINK);
GST_RPAD_CHAINFUNC (pad) = chain;
GST_CAT_DEBUG (GST_CAT_PADS, "chainfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (chain));
}
/**
* gst_pad_set_get_function:
* @pad: a real source #GstPad.
* @get: the #GstPadGetFunction to set.
*
* Sets the given get function for the pad. The get function is called to
* produce a new #GstData to start the processing pipeline. Get functions cannot
* return %NULL.
*/
void
gst_pad_set_get_function (GstPad * pad, GstPadGetFunction get)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_RPAD_DIRECTION (pad) == GST_PAD_SRC);
GST_RPAD_GETFUNC (pad) = get;
GST_CAT_DEBUG (GST_CAT_PADS, "getfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get));
}
/**
* gst_pad_set_event_function:
* @pad: a real source #GstPad.
* @event: the #GstPadEventFunction to set.
*
* Sets the given event handler for the pad.
*/
void
gst_pad_set_event_function (GstPad * pad, GstPadEventFunction event)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_EVENTFUNC (pad) = event;
GST_CAT_DEBUG (GST_CAT_PADS, "eventfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (event));
}
/**
* gst_pad_set_event_mask_function:
* @pad: a real #GstPad of either direction.
* @mask_func: the #GstPadEventMaskFunction to set.
*
* Sets the given event mask function for the pad.
*/
void
gst_pad_set_event_mask_function (GstPad * pad,
GstPadEventMaskFunction mask_func)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_EVENTMASKFUNC (pad) = mask_func;
GST_CAT_DEBUG (GST_CAT_PADS, "eventmaskfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (mask_func));
}
/**
* gst_pad_get_event_masks:
* @pad: a #GstPad.
*
* Gets the array of eventmasks from the given pad.
*
* Returns: a zero-terminated array of #GstEventMask, or NULL if the pad does
* not have an event mask function.
*/
const GstEventMask *
gst_pad_get_event_masks (GstPad * pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, NULL);
if (GST_RPAD_EVENTMASKFUNC (rpad))
return GST_RPAD_EVENTMASKFUNC (rpad) (GST_PAD (pad));
return NULL;
}
static gboolean
gst_pad_get_event_masks_dispatcher (GstPad * pad, const GstEventMask ** data)
{
*data = gst_pad_get_event_masks (pad);
return TRUE;
}
/**
* gst_pad_get_event_masks_default:
* @pad: a #GstPad.
*
* Invokes the default event masks dispatcher on the pad.
*
* Returns: a zero-terminated array of #GstEventMask, or NULL if none of the
* internally-linked pads have an event mask function.
*/
const GstEventMask *
gst_pad_get_event_masks_default (GstPad * pad)
{
GstEventMask *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_event_masks_dispatcher, &result);
return result;
}
/**
* gst_pad_set_convert_function:
* @pad: a real #GstPad of either direction.
* @convert: the #GstPadConvertFunction to set.
*
* Sets the given convert function for the pad.
*/
void
gst_pad_set_convert_function (GstPad * pad, GstPadConvertFunction convert)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_CONVERTFUNC (pad) = convert;
GST_CAT_DEBUG (GST_CAT_PADS, "convertfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (convert));
}
/**
* gst_pad_set_query_function:
* @pad: a real #GstPad of either direction.
* @query: the #GstPadQueryFunction to set.
*
* Set the given query function for the pad.
*/
void
gst_pad_set_query_function (GstPad * pad, GstPadQueryFunction query)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_QUERYFUNC (pad) = query;
GST_CAT_DEBUG (GST_CAT_PADS, "queryfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (query));
}
/**
* gst_pad_set_query_type_function:
* @pad: a real #GstPad of either direction.
* @type_func: the #GstPadQueryTypeFunction to set.
*
* Set the given query type function for the pad.
*/
void
gst_pad_set_query_type_function (GstPad * pad,
GstPadQueryTypeFunction type_func)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_QUERYTYPEFUNC (pad) = type_func;
GST_CAT_DEBUG (GST_CAT_PADS, "querytypefunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (type_func));
}
/**
* gst_pad_get_query_types:
* @pad: a #GstPad.
*
* Get an array of supported queries that can be performed
* on this pad.
*
* Returns: a zero-terminated array of #GstQueryType.
*/
const GstQueryType *
gst_pad_get_query_types (GstPad * pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, NULL);
if (GST_RPAD_QUERYTYPEFUNC (rpad))
return GST_RPAD_QUERYTYPEFUNC (rpad) (GST_PAD (pad));
return NULL;
}
static gboolean
gst_pad_get_query_types_dispatcher (GstPad * pad, const GstQueryType ** data)
{
*data = gst_pad_get_query_types (pad);
return TRUE;
}
/**
* gst_pad_get_query_types_default:
* @pad: a #GstPad.
*
* Invoke the default dispatcher for the query types on
* the pad.
*
* Returns: an zero-terminated array of #GstQueryType, or NULL if none of the
* internally-linked pads has a query types function.
*/
const GstQueryType *
gst_pad_get_query_types_default (GstPad * pad)
{
GstQueryType *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_query_types_dispatcher, &result);
return result;
}
/**
* gst_pad_set_internal_link_function:
* @pad: a real #GstPad of either direction.
* @intlink: the #GstPadIntLinkFunction to set.
*
* Sets the given internal link function for the pad.
*/
void
gst_pad_set_internal_link_function (GstPad * pad, GstPadIntLinkFunction intlink)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_INTLINKFUNC (pad) = intlink;
GST_CAT_DEBUG (GST_CAT_PADS, "internal link for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (intlink));
}
/**
* gst_pad_set_formats_function:
* @pad: a real #GstPad of either direction.
* @formats: the #GstPadFormatsFunction to set.
*
* Sets the given formats function for the pad.
*/
void
gst_pad_set_formats_function (GstPad * pad, GstPadFormatsFunction formats)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_FORMATSFUNC (pad) = formats;
GST_CAT_DEBUG (GST_CAT_PADS, "formats function for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (formats));
}
/**
* gst_pad_set_link_function:
* @pad: a real #GstPad.
* @link: the #GstPadLinkFunction to set.
*
* Sets the given link function for the pad. It will be called when the pad is
* linked or relinked with caps. The caps passed to the link function are
* guaranteed to be fixed. This means that you can assume that the caps is not
* ANY or EMPTY, and that there is exactly one structure in the caps, and that
* all the fields in the structure are fixed.
*
* The return value GST_PAD_LINK_OK should be used when the caps are acceptable,
* and you've extracted all the necessary information from the caps and set the
* element's internal state appropriately.
*
* The return value GST_PAD_LINK_REFUSED should be used when the caps are
* unacceptable for whatever reason.
*
* The return value GST_PAD_LINK_DELAYED should be used when the element is in a
* state where it can't determine whether the caps are acceptable or not. This
* is often used if the element needs to open a device or process data before
* determining acceptable caps.
*
* @link must not call gst_caps_try_set_caps() on the pad that was specified as
* a parameter, although it may (and often should) call gst_caps_try_set_caps()
* on other pads.
*/
void
gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_LINKFUNC (pad) = link;
GST_CAT_DEBUG (GST_CAT_PADS, "linkfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (link));
}
/**
* gst_pad_set_unlink_function:
* @pad: a real #GstPad.
* @unlink: the #GstPadUnlinkFunction to set.
*
* Sets the given unlink function for the pad. It will be called
* when the pad is unlinked.
*/
void
gst_pad_set_unlink_function (GstPad * pad, GstPadUnlinkFunction unlink)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_UNLINKFUNC (pad) = unlink;
GST_CAT_DEBUG (GST_CAT_PADS, "unlinkfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (unlink));
}
/**
* gst_pad_set_fixate_function:
* @pad: a real #GstPad.
* @fixate: the #GstPadFixateFunction to set.
*
* Sets the given fixate function for the pad. Its job is to narrow down the
* possible caps for a connection. Fixate functions are called with a const
* caps, and should return a caps that is a strict subset of the given caps.
* That is, @fixate should create a caps that is "more fixed" than previously,
* but it does not have to return fixed caps. If @fixate can't provide more
* fixed caps, it should return %NULL.
*
* Note that @fixate will only be called after the "fixate" signal is emitted,
* and only if the caps are still non-fixed.
*/
void
gst_pad_set_fixate_function (GstPad * pad, GstPadFixateFunction fixate)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_FIXATEFUNC (pad) = fixate;
GST_CAT_DEBUG (GST_CAT_PADS, "fixatefunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (fixate));
}
/**
* gst_pad_set_getcaps_function:
* @pad: a real #GstPad.
* @getcaps: the #GstPadGetCapsFunction to set.
*
* Sets the given getcaps function for the pad. @getcaps should return the
* allowable caps for a pad in the context of the element's state, its link to
* other elements, and the devices or files it has opened. These caps must be a
* subset of the pad template caps. In the NULL state with no links, @getcaps
* should ideally return the same caps as the pad template. In rare
* circumstances, an object property can affect the caps returned by @getcaps,
* but this is discouraged.
*
* You do not need to call this function if @pad's allowed caps are always the
* same as the pad template caps. This can only be true if the padtemplate
* has fixed simple caps.
*
* For most filters, the caps returned by @getcaps is directly affected by the
* allowed caps on other pads. For demuxers and decoders, the caps returned by
* the srcpad's getcaps function is directly related to the stream data. Again,
* @getcaps should return the most specific caps it reasonably can, since this
* helps with autoplugging.
*
* Note that the return value from @getcaps is owned by the caller.
*/
void
gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
GST_RPAD_GETCAPSFUNC (pad) = getcaps;
GST_CAT_DEBUG (GST_CAT_PADS, "getcapsfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (getcaps));
}
/**
* gst_pad_set_bufferalloc_function:
* @pad: a real sink #GstPad.
* @bufalloc: the #GstPadBufferAllocFunction to set.
*
* Sets the given bufferalloc function for the pad. Note that the
* bufferalloc function can only be set on sinkpads.
*/
void
gst_pad_set_bufferalloc_function (GstPad * pad,
GstPadBufferAllocFunction bufalloc)
{
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_PAD_IS_SINK (pad));
GST_RPAD_BUFFERALLOCFUNC (pad) = bufalloc;
GST_CAT_DEBUG (GST_CAT_PADS, "bufferallocfunc for %s:%s set to %s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (bufalloc));
}
/* FIXME 0.9: Do we actually want to allow the case where src and sink are
switched? */
/**
* gst_pad_unlink:
* @srcpad: the source #GstPad to unlink.
* @sinkpad: the sink #GstPad to unlink.
*
* Unlinks the source pad from the sink pad. Will emit the "unlinked" signal on
* both pads.
*/
void
gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
{
GstRealPad *realsrc, *realsink;
GstScheduler *src_sched, *sink_sched;
g_return_if_fail (GST_IS_PAD (srcpad));
g_return_if_fail (GST_IS_PAD (sinkpad));
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinking %s:%s(%p) and %s:%s(%p)",
GST_DEBUG_PAD_NAME (srcpad), srcpad,
GST_DEBUG_PAD_NAME (sinkpad), sinkpad);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
g_return_if_fail (GST_RPAD_PEER (realsrc) != NULL);
g_return_if_fail (GST_RPAD_PEER (realsink) == realsrc);
if ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SINK) &&
(GST_RPAD_DIRECTION (realsink) == GST_PAD_SRC)) {
GstRealPad *temppad;
temppad = realsrc;
realsrc = realsink;
realsink = temppad;
}
g_return_if_fail ((GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) &&
(GST_RPAD_DIRECTION (realsink) == GST_PAD_SINK));
if (GST_RPAD_UNLINKFUNC (realsrc)) {
GST_RPAD_UNLINKFUNC (realsrc) (GST_PAD (realsrc));
}
if (GST_RPAD_UNLINKFUNC (realsink)) {
GST_RPAD_UNLINKFUNC (realsink) (GST_PAD (realsink));
}
/* get the schedulers before we unlink */
src_sched = gst_pad_get_scheduler (GST_PAD (realsrc));
sink_sched = gst_pad_get_scheduler (GST_PAD (realsink));
if (GST_RPAD_LINK (realsrc))
gst_pad_link_free (GST_RPAD_LINK (realsrc));
/* first clear peers */
GST_RPAD_PEER (realsrc) = NULL;
GST_RPAD_PEER (realsink) = NULL;
GST_RPAD_LINK (realsrc) = NULL;
GST_RPAD_LINK (realsink) = NULL;
/* now tell the scheduler */
if (src_sched && src_sched == sink_sched) {
gst_scheduler_pad_unlink (src_sched, GST_PAD (realsrc), GST_PAD (realsink));
}
/* hold a reference, as they can go away in the signal handlers */
gst_object_ref (GST_OBJECT (realsrc));
gst_object_ref (GST_OBJECT (realsink));
/* fire off a signal to each of the pads telling them
* that they've been unlinked */
g_signal_emit (G_OBJECT (realsrc), gst_real_pad_signals[REAL_UNLINKED],
0, realsink);
g_signal_emit (G_OBJECT (realsink), gst_real_pad_signals[REAL_UNLINKED],
0, realsrc);
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
gst_object_unref (GST_OBJECT (realsrc));
gst_object_unref (GST_OBJECT (realsink));
}
/**
* gst_pad_is_linked:
* @pad: pad to check
*
* Checks if a @pad is linked to another pad or not.
*
* Returns: TRUE if the pad is linked, FALSE otherwise.
*
* MT safe.
*/
gboolean
gst_pad_is_linked (GstPad * pad)
{
gboolean result;
GstRealPad *realpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad);
result = (GST_PAD_PEER (realpad) != NULL);
GST_UNLOCK (realpad);
return result;
lost_ghostpad:
{
return FALSE;
}
}
static gboolean
gst_pad_check_schedulers (GstRealPad * realsrc, GstRealPad * realsink)
{
GstScheduler *src_sched, *sink_sched;
gint num_decoupled = 0;
src_sched = gst_pad_get_scheduler (GST_PAD (realsrc));
sink_sched = gst_pad_get_scheduler (GST_PAD (realsink));
if (src_sched && sink_sched) {
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsrc), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (GST_FLAG_IS_SET (GST_PAD_PARENT (realsink), GST_ELEMENT_DECOUPLED))
num_decoupled++;
if (src_sched != sink_sched && num_decoupled != 1) {
return FALSE;
}
}
return TRUE;
}
#define GST_PAD_LINK_SRC(pad) ((GST_PAD_IS_SRC (pad)) ? (pad) : GST_PAD_PEER (pad))
#define GST_PAD_LINK_SINK(pad) ((GST_PAD_IS_SINK (pad)) ? (pad) : GST_PAD_PEER (pad))
static GstPadLink *
gst_pad_link_new (void)
{
GstPadLink *link;
link = g_new0 (GstPadLink, 1);
link->sinknotify = TRUE;
link->srcnotify = TRUE;
link->engaged = FALSE;
return link;
}
static void
gst_pad_link_free (GstPadLink * link)
{
if (link->srccaps)
gst_caps_unref (link->srccaps);
if (link->sinkcaps)
gst_caps_unref (link->sinkcaps);
if (link->filtercaps)
gst_caps_unref (link->filtercaps);
if (link->caps)
gst_caps_unref (link->caps);
if (link->temp_store)
gst_data_unref (link->temp_store);
#ifdef USE_POISONING
memset (link, 0xff, sizeof (*link));
#endif
g_free (link);
}
static void
gst_pad_link_intersect (GstPadLink * link)
{
GstCaps *pad_intersection;
if (link->caps)
gst_caps_unref (link->caps);
GST_DEBUG ("intersecting link from %s:%s to %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad));
GST_DEBUG ("... srccaps %" GST_PTR_FORMAT, link->srccaps);
GST_DEBUG ("... sinkcaps %" GST_PTR_FORMAT, link->sinkcaps);
GST_DEBUG ("... filtercaps %" GST_PTR_FORMAT, link->filtercaps);
pad_intersection = gst_caps_intersect (link->srccaps, link->sinkcaps);
if (link->filtercaps) {
GST_DEBUG ("unfiltered intersection %" GST_PTR_FORMAT, pad_intersection);
link->caps = gst_caps_intersect (pad_intersection, link->filtercaps);
gst_caps_unref (pad_intersection);
} else {
link->caps = pad_intersection;
}
GST_DEBUG ("filtered intersection %" GST_PTR_FORMAT, link->caps);
}
static gboolean
gst_pad_link_ready_for_negotiation (GstPadLink * link)
{
GstElement *parent;
parent = GST_PAD_PARENT (link->srcpad);
if (!parent || GST_STATE (parent) < GST_STATE_READY) {
GST_DEBUG ("parent %s of pad %s:%s is not READY",
GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->srcpad));
return FALSE;
}
parent = GST_PAD_PARENT (link->sinkpad);
if (!parent || GST_STATE (parent) < GST_STATE_READY) {
GST_DEBUG ("parent %s of pad %s:%s is not READY",
GST_ELEMENT_NAME (parent), GST_DEBUG_PAD_NAME (link->sinkpad));
return FALSE;
}
return TRUE;
}
static void
gst_pad_link_fixate (GstPadLink * link)
{
GstCaps *caps;
GstCaps *newcaps;
caps = link->caps;
g_return_if_fail (caps != NULL);
g_return_if_fail (!gst_caps_is_empty (caps));
GST_DEBUG ("trying to fixate caps %" GST_PTR_FORMAT, caps);
gst_caps_do_simplify (caps);
while (!gst_caps_is_fixed (caps)) {
int i;
for (i = 0; i < 5; i++) {
newcaps = NULL;
switch (i) {
case 0:
g_signal_emit (G_OBJECT (link->srcpad),
gst_real_pad_signals[REAL_FIXATE], 0, caps, &newcaps);
GST_DEBUG ("app srcpad signal fixated to %" GST_PTR_FORMAT, newcaps);
break;
case 1:
g_signal_emit (G_OBJECT (link->sinkpad),
gst_real_pad_signals[REAL_FIXATE], 0, caps, &newcaps);
GST_DEBUG ("app sinkpad signal fixated to %" GST_PTR_FORMAT, newcaps);
break;
case 2:
if (GST_RPAD_FIXATEFUNC (link->srcpad)) {
newcaps =
GST_RPAD_FIXATEFUNC (link->srcpad) (GST_PAD (link->srcpad),
caps);
GST_DEBUG ("srcpad %s:%s fixated to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->srcpad), newcaps);
} else
GST_DEBUG ("srcpad %s:%s doesn't have a fixate function",
GST_DEBUG_PAD_NAME (link->srcpad));
break;
case 3:
if (GST_RPAD_FIXATEFUNC (link->sinkpad)) {
newcaps =
GST_RPAD_FIXATEFUNC (link->sinkpad) (GST_PAD (link->sinkpad),
caps);
GST_DEBUG ("sinkpad %s:%s fixated to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (link->sinkpad), newcaps);
} else
GST_DEBUG ("sinkpad %s:%s doesn't have a fixate function",
GST_DEBUG_PAD_NAME (link->sinkpad));
break;
case 4:
newcaps = _gst_pad_default_fixate_func (GST_PAD (link->srcpad), caps);
GST_DEBUG ("core fixated to %" GST_PTR_FORMAT, newcaps);
break;
}
if (newcaps) {
G_GNUC_UNUSED gboolean bad;
gst_caps_do_simplify (newcaps);
#ifndef G_DISABLE_CHECKS
/* some mad checking for correctly working fixation functions */
if (i == 4) {
/* we trust the default fixation function unconditionally */
bad = FALSE;
} else if (gst_caps_is_empty (newcaps)) {
g_warning
("a fixation function did not fixate correctly, it returned empty caps");
gst_caps_unref (newcaps);
continue;
} else if (gst_caps_is_any (caps)) {
bad = gst_caps_is_any (newcaps);
} else {
GstCaps *test = gst_caps_subtract (caps, newcaps);
bad = gst_caps_is_empty (test);
gst_caps_unref (test);
/* simplifying is ok, too */
if (bad)
bad = (gst_caps_get_size (newcaps) >= gst_caps_get_size (caps));
}
if (bad) {
gchar *newcaps_str = gst_caps_to_string (newcaps);
gchar *caps_str = gst_caps_to_string (caps);
g_warning
("a fixation function did not fixate correctly, the returned caps %s are no true subset of %s.",
newcaps_str, caps_str);
g_free (newcaps_str);
g_free (caps_str);
gst_caps_unref (newcaps);
} else
#endif
{
gst_caps_unref (caps);
caps = newcaps;
break;
}
}
}
}
link->caps = caps;
}
static GstPadLinkReturn
gst_pad_link_call_link_functions (GstPadLink * link)
{
GstPadLinkReturn res = GST_PAD_LINK_OK;
/* Detect recursion. */
if (GST_PAD_IS_NEGOTIATING (link->srcpad) ||
GST_PAD_IS_NEGOTIATING (link->sinkpad)) {
GST_ERROR ("The link functions have recursed, please file a bug!");
return GST_PAD_LINK_REFUSED;
}
/* Both of the pads are in negotiation, so we set the NEGOTIATING flag on both
* of them now to avoid recursion from either pad. */
GST_FLAG_SET (link->srcpad, GST_PAD_NEGOTIATING);
GST_FLAG_SET (link->sinkpad, GST_PAD_NEGOTIATING);
/* If this doesn't run, the status is left to the default OK value. */
if (link->srcnotify && GST_RPAD_LINKFUNC (link->srcpad)) {
/* call the link function */
GST_DEBUG_OBJECT (link->srcpad,
"calling link function with caps %" GST_PTR_FORMAT, link->caps);
res = GST_RPAD_LINKFUNC (link->srcpad) (GST_PAD (link->srcpad), link->caps);
GST_DEBUG_OBJECT (link->srcpad, "got reply %d from link function", res);
if (GST_PAD_LINK_FAILED (res)) {
GST_CAT_INFO_OBJECT (GST_CAT_CAPS, link->srcpad,
"pad doesn't accept caps %" GST_PTR_FORMAT, link->caps);
}
}
if (GST_PAD_LINK_SUCCESSFUL (res) &&
link->sinknotify && GST_RPAD_LINKFUNC (link->sinkpad)) {
/* call the link function */
GST_DEBUG_OBJECT (link->sinkpad,
"calling link function with caps %" GST_PTR_FORMAT, link->caps);
res = GST_RPAD_LINKFUNC (link->sinkpad) (GST_PAD (link->sinkpad),
link->caps);
GST_DEBUG_OBJECT (link->sinkpad, "got reply %d from link function", res);
if (GST_PAD_LINK_FAILED (res)) {
GST_CAT_INFO_OBJECT (GST_CAT_CAPS, link->sinkpad,
"pad doesn't accept caps %" GST_PTR_FORMAT, link->caps);
}
}
GST_FLAG_UNSET (link->srcpad, GST_PAD_NEGOTIATING);
GST_FLAG_UNSET (link->sinkpad, GST_PAD_NEGOTIATING);
return res;
}
static GstPadLinkReturn
gst_pad_link_negotiate (GstPadLink * link)
{
GST_DEBUG ("negotiating link from pad %s:%s to pad %s:%s",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad));
gst_pad_link_intersect (link);
if (gst_caps_is_empty (link->caps))
return GST_PAD_LINK_REFUSED;
gst_pad_link_fixate (link);
if (gst_caps_is_empty (link->caps))
return GST_PAD_LINK_REFUSED;
if (!gst_pad_link_ready_for_negotiation (link)) {
return GST_PAD_LINK_DELAYED;
}
GST_DEBUG ("calling link_functions between %s:%s and %s:%s with caps %"
GST_PTR_FORMAT, GST_DEBUG_PAD_NAME (link->srcpad),
GST_DEBUG_PAD_NAME (link->sinkpad), link->caps);
return gst_pad_link_call_link_functions (link);
}
/**
* gst_pad_link_try:
* @link: link to try
*
* Tries to (re)link the pads with the given link. The function takes ownership
* of the supplied link. If the function returns FALSE and an old link existed,
* that link can be assumed to work unchanged.
*
* Returns: TRUE if the link succeeded, FALSE if not.
*/
static gboolean
gst_pad_link_try (GstPadLink * link)
{
GstPad *srcpad, *sinkpad;
GstPadLink *oldlink;
GstPadLinkReturn ret;
/* we use assertions here, because this function is static */
g_assert (link);
srcpad = link->srcpad;
g_assert (srcpad);
sinkpad = link->sinkpad;
g_assert (sinkpad);
oldlink = GST_RPAD_LINK (srcpad);
g_assert (oldlink == GST_RPAD_LINK (sinkpad));
GST_DEBUG ("negotiating given link");
ret = gst_pad_link_negotiate (link);
if (GST_PAD_LINK_FAILED (ret) && oldlink && oldlink->caps) {
GST_DEBUG ("negotiating failed, but there was a valid old link");
oldlink->srcnotify = link->srcnotify;
oldlink->sinknotify = link->sinknotify;
if (GST_PAD_LINK_FAILED (gst_pad_link_call_link_functions (oldlink))) {
g_warning ("pads don't accept old caps. We assume they did though");
}
}
if (ret == GST_PAD_LINK_REFUSED) {
GST_DEBUG ("link refused, returning");
gst_pad_link_free (link);
return ret;
}
if (ret == GST_PAD_LINK_DELAYED) {
GST_DEBUG ("link delayed, replacing link caps and returning");
gst_caps_replace (&link->caps, NULL);
}
GST_RPAD_PEER (srcpad) = GST_REAL_PAD (link->sinkpad);
GST_RPAD_PEER (sinkpad) = GST_REAL_PAD (link->srcpad);
if (oldlink) {
GST_DEBUG ("copying stuff from oldlink");
link->temp_store = oldlink->temp_store;
GST_DEBUG ("moving old data temp store %p", link->temp_store);
link->engaged = oldlink->engaged;
oldlink->temp_store = NULL;
gst_pad_link_free (oldlink);
}
GST_RPAD_LINK (srcpad) = link;
GST_RPAD_LINK (sinkpad) = link;
if (ret == GST_PAD_LINK_OK) {
GST_DEBUG ("notifying caps after successful link");
g_object_notify (G_OBJECT (srcpad), "caps");
g_object_notify (G_OBJECT (sinkpad), "caps");
}
return ret;
}
/**
* gst_pad_renegotiate:
* @pad: a #GstPad
*
* Initiate caps negotiation on @pad. @pad must be linked.
*
* If @pad's parent is not at least in #GST_STATE_READY, returns
* #GST_PAD_LINK_DELAYED.
*
* Otherwise caps are retrieved from both @pad and its peer by calling their
* getcaps functions. They are then intersected, returning #GST_PAD_LINK_FAIL if
* there is no intersection.
*
* The intersection is fixated if necessary, and then the link functions of @pad
* and its peer are called.
*
* Returns: The return value of @pad's link function (see
* gst_pad_set_link_function()), or #GST_PAD_LINK_OK if there is no link
* function.
*
* The macros GST_PAD_LINK_SUCCESSFUL() and GST_PAD_LINK_FAILED() should be used
* when you just need success/failure information.
*/
GstPadLinkReturn
gst_pad_renegotiate (GstPad * pad)
{
GstPadLink *link;
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
if (!GST_PAD_PEER (pad))
return GST_PAD_LINK_OK;
link = gst_pad_link_new ();
link->srcpad = GST_PAD_LINK_SRC (pad);
link->sinkpad = GST_PAD_LINK_SINK (pad);
if (!gst_pad_link_ready_for_negotiation (link)) {
gst_pad_link_free (link);
return GST_PAD_LINK_DELAYED;
}
if (GST_REAL_PAD (pad)->link->filtercaps) {
link->filtercaps = gst_caps_copy (GST_REAL_PAD (pad)->link->filtercaps);
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
return gst_pad_link_try (link);
}
/**
* gst_pad_try_set_caps:
* @pad: a #GstPad
* @caps: #GstCaps to set on @pad
*
* Try to set the caps on @pad. @caps must be fixed. If @pad is unlinked,
* returns #GST_PAD_LINK_OK without doing anything. Otherwise, start caps
* negotiation on @pad.
*
* Returns: The return value of @pad's link function (see
* gst_pad_set_link_function()), or #GST_PAD_LINK_OK if there is no link
* function.
*
* The macros GST_PAD_LINK_SUCCESSFUL() and GST_PAD_LINK_FAILED() should be used
* when you just need success/failure information.
*/
GstPadLinkReturn
gst_pad_try_set_caps (GstPad * pad, const GstCaps * caps)
{
GstPadLink *link;
GstPadLink *oldlink;
GstPadLinkReturn ret;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_PAD_LINK_REFUSED);
GST_LOG_OBJECT (pad, "Trying to set %" GST_PTR_FORMAT, caps);
if (GST_PAD_IS_NEGOTIATING (pad)) {
GST_DEBUG_OBJECT (pad, "Detected a recursion, just returning OK");
return GST_PAD_LINK_OK;
}
GST_CAT_INFO_OBJECT (GST_CAT_CAPS, pad, "caps %" GST_PTR_FORMAT, caps);
/* setting non-fixed caps on a pad is not allowed */
if (!gst_caps_is_fixed (caps)) {
GST_CAT_INFO (GST_CAT_CAPS,
"trying to set unfixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (pad));
g_warning ("trying to set non fixed caps on pad %s:%s, not allowed",
GST_DEBUG_PAD_NAME (pad));
GST_DEBUG ("unfixed caps %" GST_PTR_FORMAT, caps);
return GST_PAD_LINK_REFUSED;
}
/* we allow setting caps on non-linked pads. It's ignored */
if (!GST_PAD_PEER (pad)) {
GST_DEBUG ("unlinked pad %s:%s, returning OK", GST_DEBUG_PAD_NAME (pad));
return GST_PAD_LINK_OK;
}
/* we just checked that a peer exists */
g_assert (GST_PAD_LINK_SRC (pad));
g_assert (GST_PAD_LINK_SINK (pad));
/* if the desired caps are already there, it's trivially ok */
if (GST_PAD_CAPS (pad) && gst_caps_is_equal (caps, GST_PAD_CAPS (pad))) {
GST_DEBUG ("pad %s:%s already has these caps", GST_DEBUG_PAD_NAME (pad));
return GST_PAD_LINK_OK;
}
link = gst_pad_link_new ();
link->srcpad = GST_PAD_LINK_SRC (pad);
link->sinkpad = GST_PAD_LINK_SINK (pad);
if (!gst_pad_link_ready_for_negotiation (link)) {
GST_DEBUG ("link not ready for negotiating, delaying");
gst_pad_link_free (link);
return GST_PAD_LINK_DELAYED;
}
oldlink = GST_REAL_PAD (pad)->link;
if (oldlink && oldlink->filtercaps) {
link->filtercaps = gst_caps_copy (oldlink->filtercaps);
}
if (link->srcpad == pad) {
link->srccaps = gst_caps_copy (caps);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
link->srcnotify = FALSE;
} else {
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_caps_copy (caps);
link->sinknotify = FALSE;
}
GST_DEBUG ("trying to link");
ret = gst_pad_link_try (link);
return ret;
}
/* FIXME, temporarily put here until real code gets backported */
gboolean
gst_pad_set_caps (GstPad * pad, GstCaps * caps)
{
return TRUE;
}
/**
* gst_pad_try_set_caps_nonfixed:
* @pad: a real #GstPad
* @caps: #GstCaps to set on @pad
*
* Like gst_pad_try_set_caps(), but allows non-fixed caps.
*
* Returns: a #GstPadLinkReturn, like gst_pad_try_set_caps().
*/
GstPadLinkReturn
gst_pad_try_set_caps_nonfixed (GstPad * pad, const GstCaps * caps)
{
GstPadLink *link;
GstPadLink *oldlink;
GstPadLinkReturn ret;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (!GST_PAD_IS_NEGOTIATING (pad), GST_PAD_LINK_REFUSED);
/* we allow setting caps on non-linked pads. It's ignored */
if (!GST_PAD_PEER (pad)) {
return GST_PAD_LINK_OK;
}
/* we just checked that a peer exists */
g_assert (GST_PAD_LINK_SRC (pad));
g_assert (GST_PAD_LINK_SINK (pad));
/* if the link is already negotiated and the caps are compatible
* with what we're setting, it's trivially OK. */
if (GST_PAD_CAPS (pad)) {
GstCaps *intersection;
intersection = gst_caps_intersect (caps, GST_PAD_CAPS (pad));
if (!gst_caps_is_empty (intersection)) {
gst_caps_unref (intersection);
return GST_PAD_LINK_OK;
}
gst_caps_unref (intersection);
}
link = gst_pad_link_new ();
link->srcpad = GST_PAD_LINK_SRC (pad);
link->sinkpad = GST_PAD_LINK_SINK (pad);
if (!gst_pad_link_ready_for_negotiation (link)) {
gst_pad_link_free (link);
return GST_PAD_LINK_DELAYED;
}
oldlink = GST_REAL_PAD (pad)->link;
if (oldlink && oldlink->filtercaps) {
link->filtercaps = gst_caps_copy (oldlink->filtercaps);
}
if (link->srcpad == pad) {
link->srccaps = gst_caps_copy (caps);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
link->srcnotify = FALSE;
} else {
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_caps_copy (caps);
link->sinknotify = FALSE;
}
ret = gst_pad_link_try (link);
return ret;
}
/**
* gst_pad_link_filtered:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
* @filtercaps: the filter #GstCaps.
*
* Links the source pad and the sink pad, constrained
* by the given filter caps.
*
* Returns: TRUE if the pads have been linked, FALSE otherwise.
*/
gboolean
gst_pad_link_filtered (GstPad * srcpad, GstPad * sinkpad,
const GstCaps * filtercaps)
{
GstRealPad *realsrc, *realsink;
GstScheduler *src_sched, *sink_sched;
GstPadLink *link;
/* generic checks */
g_return_val_if_fail (srcpad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
g_return_val_if_fail (sinkpad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
/* now we need to deal with the real/ghost stuff */
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
GST_CAT_INFO (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
/* FIXME: shouldn't we convert this to g_return_val_if_fail? */
if (GST_RPAD_PEER (realsrc) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real source pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_RPAD_PEER (realsink) != NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has a peer, failed",
GST_DEBUG_PAD_NAME (realsink));
return FALSE;
}
if (GST_PAD_PARENT (realsrc) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real src pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (GST_PAD_PARENT (realsink) == NULL) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s has no parent, failed",
GST_DEBUG_PAD_NAME (realsrc));
return FALSE;
}
if (!gst_pad_check_schedulers (realsrc, realsink)) {
g_warning ("linking pads with different scheds requires "
"exactly one decoupled element (such as queue)");
return FALSE;
}
g_return_val_if_fail (realsrc != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (realsink != NULL, GST_PAD_LINK_REFUSED);
link = gst_pad_link_new ();
if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) {
link->srcpad = GST_PAD (realsrc);
link->sinkpad = GST_PAD (realsink);
} else {
link->srcpad = GST_PAD (realsink);
link->sinkpad = GST_PAD (realsrc);
}
if (GST_RPAD_DIRECTION (link->srcpad) != GST_PAD_SRC) {
GST_CAT_INFO (GST_CAT_PADS,
"Real src pad %s:%s is not a source pad, failed",
GST_DEBUG_PAD_NAME (link->srcpad));
gst_pad_link_free (link);
return FALSE;
}
if (GST_RPAD_DIRECTION (link->sinkpad) != GST_PAD_SINK) {
GST_CAT_INFO (GST_CAT_PADS, "Real sink pad %s:%s is not a sink pad, failed",
GST_DEBUG_PAD_NAME (link->sinkpad));
gst_pad_link_free (link);
return FALSE;
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps)
link->filtercaps = gst_caps_copy (filtercaps);
if (gst_pad_link_try (link) == GST_PAD_LINK_REFUSED)
return FALSE;
/* fire off a signal to each of the pads telling them
* that they've been linked */
g_signal_emit (G_OBJECT (link->srcpad), gst_real_pad_signals[REAL_LINKED],
0, link->sinkpad);
g_signal_emit (G_OBJECT (link->sinkpad), gst_real_pad_signals[REAL_LINKED],
0, link->srcpad);
src_sched = gst_pad_get_scheduler (GST_PAD (link->srcpad));
sink_sched = gst_pad_get_scheduler (GST_PAD (link->sinkpad));
/* now tell the scheduler */
if (src_sched && src_sched == sink_sched) {
gst_scheduler_pad_link (src_sched,
GST_PAD (link->srcpad), GST_PAD (link->sinkpad));
} else {
GST_CAT_INFO (GST_CAT_PADS,
"not telling link to scheduler %s:%s and %s:%s, %p %p",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad),
src_sched, sink_sched);
}
GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
GST_DEBUG_PAD_NAME (link->srcpad), GST_DEBUG_PAD_NAME (link->sinkpad));
return TRUE;
}
/**
* gst_pad_link:
* @srcpad: the source #GstPad to link.
* @sinkpad: the sink #GstPad to link.
*
* Links the source pad to the sink pad.
*
* Returns: TRUE if the pad could be linked, FALSE otherwise.
*/
gboolean
gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
{
return gst_pad_link_filtered (srcpad, sinkpad, NULL);
}
static void
gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ)
{
/* this function would need checks if it weren't static */
GST_LOCK (pad);
gst_object_replace ((GstObject **) & pad->padtemplate, (GstObject *) templ);
GST_UNLOCK (pad);
if (templ) {
gst_object_sink (GST_OBJECT (templ));
g_signal_emit (G_OBJECT (templ),
gst_pad_template_signals[TEMPL_PAD_CREATED], 0, pad);
}
}
/**
* gst_pad_get_pad_template:
* @pad: a #GstPad.
*
* Gets the template for @pad.
*
* Returns: the #GstPadTemplate from which this pad was instantiated, or %NULL
* if this pad has no template.
*/
GstPadTemplate *
gst_pad_get_pad_template (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
return GST_PAD_PAD_TEMPLATE (pad);
}
/**
* gst_pad_get_scheduler:
* @pad: a #GstPad to get the scheduler of.
*
* Gets the scheduler of the pad. Since the pad does not
* have a scheduler of its own, the scheduler of the parent
* is taken. For decoupled pads, the scheduler of the peer
* parent is taken.
*
* Returns: the #GstScheduler of the pad, or %NULL if there is no parent or the
* parent is not yet in a managing bin.
*/
GstScheduler *
gst_pad_get_scheduler (GstPad * pad)
{
GstScheduler *scheduler = NULL;
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
parent = gst_pad_get_parent (pad);
if (parent) {
if (GST_FLAG_IS_SET (parent, GST_ELEMENT_DECOUPLED)) {
GstRealPad *peer = GST_RPAD_PEER (pad);
if (peer) {
scheduler =
gst_element_get_scheduler (gst_pad_get_parent (GST_PAD (peer)));
}
} else {
scheduler = gst_element_get_scheduler (parent);
}
}
return scheduler;
}
/**
* gst_pad_get_real_parent:
* @pad: a #GstPad to get the real parent of.
*
* Gets the real parent object of this pad. If the pad
* is a ghost pad, the actual owner of the real pad is
* returned, as opposed to #gst_pad_get_parent().
* Unref the object after use.
*
* Returns: the parent #GstElement.
*
* MT safe.
*/
GstElement *
gst_pad_get_real_parent (GstPad * pad)
{
GstRealPad *realpad;
GstElement *element;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad);
element = GST_PAD_PARENT (realpad);
if (element)
gst_object_ref (GST_OBJECT (element));
GST_UNLOCK (realpad);
return element;
lost_ghostpad:
{
return NULL;
}
}
/* FIXME not MT safe */
static void
gst_pad_add_ghost_pad (GstPad * pad, GstPad * ghostpad)
{
GstRealPad *realpad;
/* if we're ghosting a ghost pad, drill down to find the real pad */
realpad = (GstRealPad *) pad;
while (GST_IS_GHOST_PAD (realpad))
realpad = GST_GPAD_REALPAD (realpad);
g_return_if_fail (GST_IS_REAL_PAD (realpad));
/* will ref the pad template */
GST_GPAD_REALPAD (ghostpad) = realpad;
realpad->ghostpads = g_list_prepend (realpad->ghostpads, ghostpad);
gst_pad_set_pad_template (GST_PAD (ghostpad), GST_PAD_PAD_TEMPLATE (pad));
}
static void
gst_pad_remove_ghost_pad (GstPad * pad, GstPad * ghostpad)
{
GstRealPad *realpad;
realpad = GST_PAD_REALIZE (pad);
g_return_if_fail (GST_GPAD_REALPAD (ghostpad) == realpad);
gst_pad_set_pad_template (GST_PAD (ghostpad), NULL);
realpad->ghostpads = g_list_remove (realpad->ghostpads, ghostpad);
GST_GPAD_REALPAD (ghostpad) = NULL;
}
static gboolean
_gst_pad_default_fixate_value (const GValue * value, GValue * dest)
{
GType type = G_VALUE_TYPE (value);
if (gst_value_is_fixed (value))
return TRUE;
if (type == GST_TYPE_INT_RANGE) {
g_value_init (dest, G_TYPE_INT);
g_value_set_int (dest, gst_value_get_int_range_min (value));
} else if (type == GST_TYPE_DOUBLE_RANGE) {
g_value_init (dest, G_TYPE_DOUBLE);
g_value_set_double (dest, gst_value_get_double_range_min (value));
} else if (type == GST_TYPE_LIST) {
gst_value_init_and_copy (dest, gst_value_list_get_value (value, 0));
} else if (type == GST_TYPE_FIXED_LIST) {
gint size, n;
GValue dest_kid = { 0 };
const GValue *kid;
/* check recursively */
g_value_init (dest, GST_TYPE_FIXED_LIST);
size = gst_value_list_get_size (value);
for (n = 0; n < size; n++) {
kid = gst_value_list_get_value (value, n);
if (_gst_pad_default_fixate_value (kid, &dest_kid)) {
gst_value_list_append_value (dest, kid);
} else {
gst_value_list_append_value (dest, &dest_kid);
g_value_unset (&dest_kid);
}
}
} else {
g_critical ("Don't know how to fixate value type %s", g_type_name (type));
}
return FALSE;
}
static gboolean
_gst_pad_default_fixate_foreach (GQuark field_id, const GValue * value,
gpointer s)
{
GstStructure *structure = (GstStructure *) s;
GValue dest = { 0 };
if (_gst_pad_default_fixate_value (value, &dest))
return TRUE;
gst_structure_id_set_value (structure, field_id, &dest);
g_value_unset (&dest);
return FALSE;
}
static GstCaps *
_gst_pad_default_fixate_func (GstPad * pad, const GstCaps * caps)
{
static GstStaticCaps octetcaps = GST_STATIC_CAPS ("application/octet-stream");
GstStructure *structure;
GstCaps *newcaps;
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (!gst_caps_is_empty (caps), NULL);
if (gst_caps_is_any (caps)) {
return gst_caps_copy (gst_static_caps_get (&octetcaps));
}
if (caps->structs->len > 1) {
return gst_caps_new_full (gst_structure_copy (gst_caps_get_structure (caps,
0)), NULL);
}
newcaps = gst_caps_copy (caps);
structure = gst_caps_get_structure (newcaps, 0);
gst_structure_foreach (structure, _gst_pad_default_fixate_foreach, structure);
return newcaps;
}
/**
* gst_pad_perform_negotiate:
* @srcpad: the source #GstPad.
* @sinkpad: the sink #GstPad.
*
* Tries to negotiate the pads. See gst_pad_renegotiate() for a brief
* description of caps negotiation.
*
* Returns: TRUE if the pads were succesfully negotiated, FALSE otherwise.
*/
gboolean
gst_pad_perform_negotiate (GstPad * srcpad, GstPad * sinkpad)
{
return GST_PAD_LINK_SUCCESSFUL (gst_pad_renegotiate (srcpad));
}
static void
gst_pad_link_unnegotiate (GstPadLink * link)
{
g_return_if_fail (link != NULL);
if (link->caps) {
gst_caps_unref (link->caps);
link->caps = NULL;
link->engaged = FALSE;
if (GST_RPAD_LINK (link->srcpad) != link) {
g_warning ("unnegotiating unset link");
} else {
g_object_notify (G_OBJECT (link->srcpad), "caps");
}
if (GST_RPAD_LINK (link->sinkpad) != link) {
g_warning ("unnegotiating unset link");
} else {
g_object_notify (G_OBJECT (link->sinkpad), "caps");
}
}
}
/**
* gst_pad_unnegotiate:
* @pad: pad to unnegotiate
*
* "Unnegotiates" a pad. The currently negotiated caps are cleared and the pad
* needs renegotiation.
*/
void
gst_pad_unnegotiate (GstPad * pad)
{
GstPadLink *link;
g_return_if_fail (GST_IS_PAD (pad));
link = GST_RPAD_LINK (GST_PAD_REALIZE (pad));
if (link)
gst_pad_link_unnegotiate (link);
}
/* returning NULL indicates that the arguments are invalid */
static GstPadLink *
gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad,
const GstCaps * filtercaps)
{
GstRealPad *realsrc, *realsink;
GstPadLink *link;
g_return_val_if_fail (GST_IS_PAD (srcpad), NULL);
g_return_val_if_fail (GST_IS_PAD (sinkpad), NULL);
realsrc = GST_PAD_REALIZE (srcpad);
realsink = GST_PAD_REALIZE (sinkpad);
if ((GST_PAD (realsrc) != srcpad) || (GST_PAD (realsink) != sinkpad)) {
GST_CAT_DEBUG (GST_CAT_PADS, "*actually* linking %s:%s and %s:%s",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink));
}
g_return_val_if_fail (GST_RPAD_PEER (realsrc) == NULL, NULL);
g_return_val_if_fail (GST_RPAD_PEER (realsink) == NULL, NULL);
g_return_val_if_fail (GST_PAD_PARENT (realsrc) != NULL, NULL);
g_return_val_if_fail (GST_PAD_PARENT (realsink) != NULL, NULL);
if (!gst_pad_check_schedulers (realsrc, realsink)) {
g_warning ("linking pads with different scheds requires "
"exactly one decoupled element (such as queue)");
return NULL;
}
if (GST_RPAD_DIRECTION (realsrc) == GST_RPAD_DIRECTION (realsink)) {
g_warning ("%s:%s and %s:%s are both %s pads, failed",
GST_DEBUG_PAD_NAME (realsrc), GST_DEBUG_PAD_NAME (realsink),
GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC ? "src" : "sink");
return NULL;
}
link = gst_pad_link_new ();
if (GST_RPAD_DIRECTION (realsrc) == GST_PAD_SRC) {
link->srcpad = GST_PAD (realsrc);
link->sinkpad = GST_PAD (realsink);
} else {
link->srcpad = GST_PAD (realsink);
link->sinkpad = GST_PAD (realsrc);
}
link->srccaps = gst_pad_get_caps (link->srcpad);
link->sinkcaps = gst_pad_get_caps (link->sinkpad);
if (filtercaps)
link->filtercaps = gst_caps_copy (filtercaps);
return link;
}
/**
* gst_pad_try_relink_filtered:
* @srcpad: the source #GstPad to relink.
* @sinkpad: the sink #GstPad to relink.
* @filtercaps: the #GstPad to use as a filter in the relink.
*
* Tries to relink the given source and sink pad, constrained by the given
* capabilities.
*
* Returns: TRUE if the pads were succesfully renegotiated, FALSE otherwise.
*/
gboolean
gst_pad_try_relink_filtered (GstPad * srcpad, GstPad * sinkpad,
const GstCaps * filtercaps)
{
GstPadLink *link;
GST_INFO ("trying to relink %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT
" with filtercaps %" GST_PTR_FORMAT, srcpad, sinkpad);
link = gst_pad_link_prepare (srcpad, sinkpad, filtercaps);
if (!link)
return FALSE;
if (GST_RPAD_PEER (link->srcpad) != (GstRealPad *) link->sinkpad) {
g_warning ("Pads %s:%s and %s:%s were never linked",
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
gst_pad_link_free (link);
return FALSE;
}
if (GST_PAD_LINK_FAILED (gst_pad_link_try (link)))
return FALSE;
return TRUE;
}
/**
* gst_pad_relink_filtered:
* @srcpad: the source #GstPad to relink.
* @sinkpad: the sink #GstPad to relink.
* @filtercaps: the #GstPad to use as a filter in the relink.
*
* Relinks the given source and sink pad, constrained by the given
* capabilities. If the relink fails, the pads are unlinked
* and FALSE is returned.
*
* Returns: TRUE if the pads were succesfully relinked, FALSE otherwise.
*/
gboolean
gst_pad_relink_filtered (GstPad * srcpad, GstPad * sinkpad,
const GstCaps * filtercaps)
{
if (gst_pad_try_relink_filtered (srcpad, sinkpad, filtercaps))
return TRUE;
gst_pad_unlink (srcpad, sinkpad);
return FALSE;
}
/**
* gst_pad_proxy_fixate:
* @pad: a #GstPad to proxy.
* @caps: the #GstCaps to fixate
*
* Implements a default fixate function based on the caps set on the other
* pads in the element. This function should only be used if every pad
* has the same pad template caps.
*
* Returns: a fixated caps, or NULL if caps cannot be fixed
*/
GstCaps *
gst_pad_proxy_fixate (GstPad * pad, const GstCaps * caps)
{
GstElement *element;
const GList *pads;
const GstCaps *othercaps;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
g_return_val_if_fail (caps != NULL, NULL);
GST_DEBUG ("proxying fixate for %s:%s\n", GST_DEBUG_PAD_NAME (pad));
element = gst_pad_get_parent (pad);
/* FIXME, not MT safe but this function will be removed */
pads = element->pads;
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
/* FIXME check that each pad has the same pad template caps */
if (otherpad != pad) {
othercaps = gst_pad_get_negotiated_caps (otherpad);
if (othercaps && !gst_caps_is_subset (caps, othercaps)) {
GstCaps *icaps;
icaps = gst_caps_intersect (othercaps, caps);
if (!gst_caps_is_empty (icaps)) {
return icaps;
} else {
gst_caps_unref (icaps);
}
}
}
pads = g_list_next (pads);
}
return NULL;
}
/**
* gst_pad_set_explicit_caps:
* @pad: a #GstPad to set the explicit caps of
* @caps: the #GstCaps to set
*
* If a pad has been told to use explicit caps, this function is used
* to set the explicit caps. If @caps is NULL, the explicit caps are
* unset.
*
* This function calls gst_pad_try_set_caps() on the pad. If that
* call fails, GST_ELEMENT_ERROR() is called to indicate a negotiation
* failure.
*
* Returns: TRUE if the caps were set correctly, otherwise FALSE
*/
gboolean
gst_pad_set_explicit_caps (GstPad * pad, const GstCaps * caps)
{
GstPadLinkReturn link_ret;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (caps == NULL || gst_caps_is_fixed (caps), FALSE);
GST_CAT_DEBUG (GST_CAT_PADS,
"setting explicit caps on %s:%s to %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if (caps == NULL) {
GST_CAT_DEBUG (GST_CAT_PADS, "caps is NULL");
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
return TRUE;
}
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), gst_caps_copy (caps));
if (!GST_PAD_IS_LINKED (pad)) {
GST_CAT_DEBUG (GST_CAT_PADS, "pad is not linked");
return TRUE;
}
link_ret = gst_pad_try_set_caps (pad, caps);
if (link_ret == GST_PAD_LINK_REFUSED) {
gchar *caps_str = gst_caps_to_string (caps);
GST_ELEMENT_ERROR (gst_pad_get_parent (pad), CORE, PAD, (NULL),
("failed to negotiate (try_set_caps with \"%s\" returned REFUSED)",
caps_str));
g_free (caps_str);
return FALSE;
}
return TRUE;
}
static GstCaps *
gst_pad_explicit_getcaps (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
const GstCaps *caps = gst_pad_get_pad_template_caps (pad);
return gst_caps_copy (caps);
}
return gst_caps_copy (GST_RPAD_EXPLICIT_CAPS (pad));
}
static GstPadLinkReturn
gst_pad_explicit_link (GstPad * pad, const GstCaps * caps)
{
g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_LINK_REFUSED);
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
if (GST_RPAD_EXPLICIT_CAPS (pad) == NULL) {
return GST_PAD_LINK_DELAYED;
}
return GST_PAD_LINK_OK;
}
/**
* gst_pad_use_explicit_caps:
* @pad: a #GstPad to set to use explicit caps
*
* This function handles negotiation for pads that need to be set
* to particular caps under complete control of the element, based
* on some state in the element. This is often the case with
* decoders and other elements whose caps is determined by the data
* stream.
*
* WARNING: This function is a hack and will be replaced with something
* better in gstreamer-0.9.
*/
void
gst_pad_use_explicit_caps (GstPad * pad)
{
g_return_if_fail (GST_IS_PAD (pad));
gst_pad_set_getcaps_function (pad, gst_pad_explicit_getcaps);
gst_pad_set_link_function (pad, gst_pad_explicit_link);
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
}
/**
* gst_pad_proxy_link:
* @pad: a #GstPad to proxy to.
* @caps: the #GstCaps to use in proxying.
*
* Proxies the link function to the specified pad.
*
* Returns: TRUE if the peer pad accepted the caps, FALSE otherwise.
*/
GstPadLinkReturn
gst_pad_proxy_link (GstPad * pad, const GstCaps * caps)
{
return gst_pad_try_set_caps (pad, caps);
}
/**
* gst_pad_is_negotiated:
* @pad: a #GstPad to get the negotiation status of
*
* Returns: TRUE if the pad has successfully negotiated caps.
*/
gboolean
gst_pad_is_negotiated (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
if (!(pad = (GstPad *) GST_PAD_REALIZE (pad)))
return FALSE;
if (!GST_RPAD_LINK (pad))
return FALSE;
return (GST_RPAD_LINK (pad)->caps != NULL);
}
/**
* gst_pad_get_negotiated_caps:
* @pad: a #GstPad to get the negotiated capabilites of
*
* Gets the currently negotiated caps of a pad.
*
* Returns: the currently negotiated caps of a pad, or NULL if the pad isn't
* negotiated.
*/
G_CONST_RETURN GstCaps *
gst_pad_get_negotiated_caps (GstPad * pad)
{
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (!(pad = (GstPad *) GST_PAD_REALIZE (pad)))
return NULL;
if (!GST_RPAD_LINK (pad))
return NULL;
return GST_RPAD_LINK (pad)->caps;
}
/**
* gst_pad_get_caps:
* @pad: a #GstPad to get the capabilities of.
*
* Gets the capabilities of this pad.
*
* Returns: the #GstCaps of this pad. This function returns a new caps, so use
* gst_caps_unref to get rid of it.
*/
GstCaps *
gst_pad_get_caps (GstPad * pad)
{
GstRealPad *realpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
realpad = GST_PAD_REALIZE (pad);
GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
GST_DEBUG_PAD_NAME (realpad), realpad);
if (GST_PAD_IS_DISPATCHING (realpad))
GST_CAT_DEBUG (GST_CAT_CAPS,
"pad %s:%s is already dispatching -- looking for a template",
GST_DEBUG_PAD_NAME (realpad));
if (GST_RPAD_GETCAPSFUNC (realpad) && !GST_PAD_IS_DISPATCHING (realpad)) {
GstCaps *caps;
GST_CAT_DEBUG (GST_CAT_CAPS, "dispatching to pad getcaps function");
GST_FLAG_SET (realpad, GST_PAD_DISPATCHING);
caps = GST_RPAD_GETCAPSFUNC (realpad) (GST_PAD (realpad));
GST_FLAG_UNSET (realpad, GST_PAD_DISPATCHING);
if (caps == NULL) {
g_critical ("pad %s:%s returned NULL caps from getcaps function\n",
GST_DEBUG_PAD_NAME (realpad));
} else {
#ifndef G_DISABLE_ASSERT
/* check that the returned caps are a real subset of the template caps */
if (GST_PAD_PAD_TEMPLATE (realpad)) {
const GstCaps *templ_caps =
GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (realpad));
if (!gst_caps_is_subset (caps, templ_caps)) {
GstCaps *temp;
GST_CAT_ERROR_OBJECT (GST_CAT_CAPS, pad,
"pad returned caps %" GST_PTR_FORMAT
" which are not a real subset of its template caps %"
GST_PTR_FORMAT, caps, templ_caps);
g_warning
("pad %s:%s returned caps that are not a real subset of its template caps",
GST_DEBUG_PAD_NAME (realpad));
temp = gst_caps_intersect (templ_caps, caps);
gst_caps_unref (caps);
caps = temp;
}
}
#endif
return caps;
}
}
if (GST_PAD_PAD_TEMPLATE (realpad)) {
GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (realpad);
const GstCaps *caps;
caps = GST_PAD_TEMPLATE_CAPS (templ);
GST_CAT_DEBUG (GST_CAT_CAPS,
"using pad template %p with caps %" GST_PTR_FORMAT, templ, caps);
#if 0
/* FIXME we should enable something like this someday, but this is
* a bit buggy */
if (!gst_caps_is_fixed (caps)) {
g_warning
("pad %s:%s (%p) has no getcaps function and the pad template returns non-fixed caps. Element is probably broken.\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
}
#endif
return gst_caps_copy (GST_PAD_TEMPLATE_CAPS (templ));
}
GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
#if 0
/* FIXME enable */
g_warning ("pad %s:%s (%p) has no pad template\n",
GST_DEBUG_PAD_NAME (realpad), realpad);
#endif
return gst_caps_new_any ();
}
/**
* gst_pad_peer_get_caps:
* @pad: a #GstPad to get the peer capabilities of.
*
* Gets the capabilities of the peer connected to this pad.
*
* Returns: the #GstCaps of the peer pad. This function returns a new caps, so use
* gst_caps_unref to get rid of it.
*/
GstCaps *
gst_pad_peer_get_caps (GstPad * pad)
{
GstRealPad *realpad, *peerpad;
GstCaps *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
/* now we need to deal with the real/ghost stuff */
GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad);
GST_CAT_DEBUG (GST_CAT_CAPS, "get peer caps of %s:%s (%p)",
GST_DEBUG_PAD_NAME (realpad), realpad);
peerpad = GST_RPAD_PEER (realpad);
if (G_UNLIKELY (peerpad == NULL))
goto no_peer;
gst_object_ref (GST_OBJECT (peerpad));
GST_UNLOCK (realpad);
result = gst_pad_get_caps (GST_PAD_CAST (peerpad));
gst_object_unref (GST_OBJECT (peerpad));
return result;
lost_ghostpad:
{
return NULL;
}
no_peer:
{
GST_UNLOCK (realpad);
return gst_caps_new_any ();
}
}
/**
* gst_pad_get_pad_template_caps:
* @pad: a #GstPad to get the template capabilities from.
*
* Gets the capabilities for @pad's template.
*
* Returns: the #GstCaps of this pad template. If you intend to keep a reference
* on the caps, make a copy (see gst_caps_copy ()).
*/
const GstCaps *
gst_pad_get_pad_template_caps (GstPad * pad)
{
static GstStaticCaps anycaps = GST_STATIC_CAPS ("ANY");
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
if (GST_PAD_PAD_TEMPLATE (pad))
return GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
return gst_static_caps_get (&anycaps);
}
/**
* gst_pad_get_peer:
* @pad: a #GstPad to get the peer of.
*
* Gets the peer of @pad. This function refs the peer pad so
* you need to unref it after use.
*
* Returns: the peer #GstPad. Unref after usage.
*
* MT safe.
*/
GstPad *
gst_pad_get_peer (GstPad * pad)
{
GstRealPad *realpad;
GstRealPad *result;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
GST_PAD_REALIZE_AND_LOCK (pad, realpad, lost_ghostpad);
result = GST_RPAD_PEER (realpad);
if (result)
gst_object_ref (GST_OBJECT (result));
GST_UNLOCK (realpad);
return GST_PAD_CAST (result);
lost_ghostpad:
{
return NULL;
}
}
/**
* gst_pad_realize:
* @pad: a #GstPad to realize
*
* If the pad is a #GstRealPad, it is simply returned, else
* the #GstGhostPad will be dereffed to the real pad.
*
* After this function you always receive the real pad of
* the provided pad.
*
* This function unrefs the input pad and refs the result so
* that you can write constructs like:
*
* pad = gst_pad_realize(pad)
*
* without having to unref the old pad.
*
* Returns: the real #GstPad or NULL when an old reference to a
* ghostpad is used.
*
* MT safe.
*/
GstPad *
gst_pad_realize (GstPad * pad)
{
GstRealPad *result;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
GST_LOCK (pad);
result = GST_PAD_REALIZE (pad);
if (result && pad != GST_PAD_CAST (result)) {
gst_object_ref (GST_OBJECT (result));
GST_UNLOCK (pad);
/* no other thread could dispose this since we
* hold at least one ref */
gst_object_unref (GST_OBJECT (pad));
} else {
GST_UNLOCK (pad);
}
return GST_PAD_CAST (result);
}
/**
* gst_pad_get_allowed_caps:
* @srcpad: a #GstPad, it must a a source pad.
*
* Gets the capabilities of the allowed media types that can flow through @pad
* and its peer. The pad must be a source pad.
* The caller must free the resulting caps.
*
* Returns: the allowed #GstCaps of the pad link. Free the caps when
* you no longer need it. This function returns NULL when the @pad has no
* peer.
*
* MT safe.
*/
GstCaps *
gst_pad_get_allowed_caps (GstPad * srcpad)
{
GstCaps *mycaps;
GstCaps *caps;
GstCaps *peercaps;
GstRealPad *realpad, *peer;
g_return_val_if_fail (GST_IS_PAD (srcpad), NULL);
GST_PAD_REALIZE_AND_LOCK (srcpad, realpad, lost_ghostpad);
if (G_UNLIKELY ((peer = GST_RPAD_PEER (realpad)) == NULL))
goto no_peer;
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting allowed caps",
GST_DEBUG_PAD_NAME (realpad));
gst_object_ref (GST_OBJECT_CAST (peer));
GST_UNLOCK (realpad);
mycaps = gst_pad_get_caps (GST_PAD_CAST (realpad));
peercaps = gst_pad_get_caps (GST_PAD_CAST (peer));
gst_object_unref (GST_OBJECT_CAST (peer));
caps = gst_caps_intersect (mycaps, peercaps);
gst_caps_unref (peercaps);
gst_caps_unref (mycaps);
GST_CAT_DEBUG (GST_CAT_CAPS, "allowed caps %" GST_PTR_FORMAT, caps);
return caps;
lost_ghostpad:
{
GST_UNLOCK (srcpad);
return NULL;
}
no_peer:
{
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer",
GST_DEBUG_PAD_NAME (realpad));
GST_UNLOCK (realpad);
return NULL;
}
}
/**
* gst_pad_caps_change_notify:
* @pad: a #GstPad
*
* Called to indicate that the return value of @pad's getcaps function may have
* changed, and that a renegotiation is suggested.
*/
void
gst_pad_caps_change_notify (GstPad * pad)
{
}
/**
* gst_pad_recover_caps_error:
* @pad: a #GstPad that had a failed capsnego
* @allowed: possible caps for the link
*
* Attempt to recover from a failed caps negotiation. This function
* is typically called by a plugin that exhausted its list of caps
* and wants the application to resolve the issue. The application
* should connect to the pad's caps_nego_failed signal and should
* resolve the issue by connecting another element for example.
*
* Returns: TRUE when the issue was resolved, dumps detailed information
* on the console and returns FALSE otherwise.
*/
gboolean
gst_pad_recover_caps_error (GstPad * pad, const GstCaps * allowed)
{
/* FIXME */
return FALSE;
}
/**
* gst_pad_alloc_buffer:
* @pad: a source #GstPad
* @offset: the offset of the new buffer in the stream
* @size: the size of the new buffer
*
* Allocates a new, empty buffer optimized to push to pad @pad. This
* function only works if @pad is a source pad.
*
* Returns: a new, empty #GstBuffer, or NULL if there is an error
*/
GstBuffer *
gst_pad_alloc_buffer (GstPad * pad, guint64 offset, gint size)
{
GstRealPad *peer;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
peer = GST_RPAD_PEER (pad);
if (peer && peer->bufferallocfunc) {
GstBuffer *ret;
GST_CAT_DEBUG (GST_CAT_BUFFER, "(%s:%s): getting buffer",
GST_DEBUG_PAD_NAME (pad));
GST_CAT_DEBUG (GST_CAT_PADS,
"calling bufferallocfunc &%s (@%p) of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->bufferallocfunc),
&peer->bufferallocfunc, GST_DEBUG_PAD_NAME (((GstPad *) peer)));
ret = (peer->bufferallocfunc) (GST_PAD (peer), offset, size);
if (ret)
return ret;
}
return gst_buffer_new_and_alloc (size);
}
static void
gst_real_pad_dispose (GObject * object)
{
GstPad *pad;
GstRealPad *rpad;
pad = GST_PAD (object);
rpad = GST_REAL_PAD (object);
/* No linked pad can ever be disposed.
* It has to have a parent to be linked
* and a parent would hold a reference */
/* FIXME: what about if g_object_dispose is explicitly called on the pad? Is
that legal? otherwise we could assert GST_OBJECT_PARENT (pad) == NULL as
well... */
g_assert (GST_PAD_PEER (pad) == NULL);
GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s",
GST_DEBUG_PAD_NAME (pad));
/* we destroy the ghostpads, because they are nothing without the real pad */
if (rpad->ghostpads) {
GList *orig, *ghostpads;
orig = ghostpads = g_list_copy (rpad->ghostpads);
while (ghostpads) {
GstPad *ghostpad = GST_PAD (ghostpads->data);
if (GST_IS_ELEMENT (GST_OBJECT_PARENT (ghostpad))) {
GstElement *parent = GST_ELEMENT (GST_OBJECT_PARENT (ghostpad));
GST_CAT_DEBUG (GST_CAT_REFCOUNTING,
"removing ghost pad from element '%s'", GST_OBJECT_NAME (parent));
gst_element_remove_pad (parent, ghostpad);
} else {
/* handle the case where we have some floating ghost pad that was never
added to an element */
g_object_set (ghostpad, "real-pad", NULL, NULL);
}
ghostpads = g_list_next (ghostpads);
}
g_list_free (orig);
/* as the ghost pads are removed, they remove themselves from ->ghostpads.
So it should be empty now. Let's assert that. */
g_assert (rpad->ghostpads == NULL);
}
if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))) {
GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'",
GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
}
if (GST_RPAD_EXPLICIT_CAPS (pad)) {
GST_ERROR_OBJECT (pad, "still explicit caps %" GST_PTR_FORMAT " set",
GST_RPAD_EXPLICIT_CAPS (pad));
g_warning ("pad %p has still explicit caps set", pad);
gst_caps_replace (&GST_RPAD_EXPLICIT_CAPS (pad), NULL);
}
G_OBJECT_CLASS (real_pad_parent_class)->dispose (object);
}
static void
gst_real_pad_finalize (GObject * object)
{
//GstRealPad *rpad;
//rpad = GST_REAL_PAD (object);
G_OBJECT_CLASS (real_pad_parent_class)->finalize (object);
}
#ifndef GST_DISABLE_LOADSAVE
/* FIXME: why isn't this on a GstElement ? */
/**
* gst_pad_load_and_link:
* @self: an #xmlNodePtr to read the description from.
* @parent: the #GstObject element that owns the pad.
*
* Reads the pad definition from the XML node and links the given pad
* in the element to a pad of an element up in the hierarchy.
*/
void
gst_pad_load_and_link (xmlNodePtr self, GstObject * parent)
{
xmlNodePtr field = self->xmlChildrenNode;
GstPad *pad = NULL, *targetpad;
gchar *peer = NULL;
gchar **split;
GstElement *target;
GstObject *grandparent;
gchar *name = NULL;
while (field) {
if (!strcmp (field->name, "name")) {
name = xmlNodeGetContent (field);
pad = gst_element_get_pad (GST_ELEMENT (parent), name);
g_free (name);
} else if (!strcmp (field->name, "peer")) {
peer = xmlNodeGetContent (field);
}
field = field->next;
}
g_return_if_fail (pad != NULL);
if (peer == NULL)
return;
split = g_strsplit (peer, ".", 2);
if (split[0] == NULL || split[1] == NULL) {
GST_CAT_DEBUG (GST_CAT_XML,
"Could not parse peer '%s' for pad %s:%s, leaving unlinked",
peer, GST_DEBUG_PAD_NAME (pad));
g_free (peer);
return;
}
g_free (peer);
g_return_if_fail (split[0] != NULL);
g_return_if_fail (split[1] != NULL);
grandparent = gst_object_get_parent (parent);
if (grandparent && GST_IS_BIN (grandparent)) {
target = gst_bin_get_by_name_recurse_up (GST_BIN (grandparent), split[0]);
} else
goto cleanup;
if (target == NULL)
goto cleanup;
targetpad = gst_element_get_pad (target, split[1]);
if (targetpad == NULL)
goto cleanup;
gst_pad_link (pad, targetpad);
cleanup:
g_strfreev (split);
}
/**
* gst_pad_save_thyself:
* @pad: a #GstPad to save.
* @parent: the parent #xmlNodePtr to save the description in.
*
* Saves the pad into an xml representation.
*
* Returns: the #xmlNodePtr representation of the pad.
*/
static xmlNodePtr
gst_pad_save_thyself (GstObject * object, xmlNodePtr parent)
{
GstRealPad *realpad;
GstPad *peer;
g_return_val_if_fail (GST_IS_REAL_PAD (object), NULL);
realpad = GST_REAL_PAD (object);
xmlNewChild (parent, NULL, "name", GST_PAD_NAME (realpad));
if (GST_RPAD_PEER (realpad) != NULL) {
gchar *content;
peer = GST_PAD (GST_RPAD_PEER (realpad));
/* first check to see if the peer's parent's parent is the same */
/* we just save it off */
content = g_strdup_printf ("%s.%s",
GST_OBJECT_NAME (GST_PAD_PARENT (peer)), GST_PAD_NAME (peer));
xmlNewChild (parent, NULL, "peer", content);
g_free (content);
} else
xmlNewChild (parent, NULL, "peer", "");
return parent;
}
/**
* gst_ghost_pad_save_thyself:
* @pad: a ghost #GstPad to save.
* @parent: the parent #xmlNodePtr to save the description in.
*
* Saves the ghost pad into an xml representation.
*
* Returns: the #xmlNodePtr representation of the pad.
*/
xmlNodePtr
gst_ghost_pad_save_thyself (GstPad * pad, xmlNodePtr parent)
{
xmlNodePtr self;
g_return_val_if_fail (GST_IS_GHOST_PAD (pad), NULL);
self = xmlNewChild (parent, NULL, "ghostpad", NULL);
xmlNewChild (self, NULL, "name", GST_PAD_NAME (pad));
xmlNewChild (self, NULL, "parent", GST_OBJECT_NAME (GST_PAD_PARENT (pad)));
/* FIXME FIXME FIXME! */
return self;
}
#endif /* GST_DISABLE_LOADSAVE */
static GstData *
_invent_event (GstPad * pad, GstBuffer * buffer)
{
GstEvent *event;
GstEventType event_type;
guint64 offset;
if (GST_BUFFER_OFFSET_IS_VALID (buffer))
event_type = GST_FORMAT_DEFAULT;
else
event_type = GST_FORMAT_UNDEFINED;
offset = GST_BUFFER_OFFSET (buffer);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buffer);
event = gst_event_new_discontinuous (TRUE,
GST_FORMAT_TIME, timestamp, event_type, offset, GST_FORMAT_UNDEFINED);
GST_CAT_WARNING (GST_CAT_SCHEDULING,
"needed to invent a DISCONT %p (time %" G_GUINT64_FORMAT
") for %s:%s => %s:%s", event, timestamp,
GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)), GST_DEBUG_PAD_NAME (pad));
} else {
event = gst_event_new_discontinuous (TRUE,
event_type, offset, GST_FORMAT_UNDEFINED);
GST_CAT_WARNING (GST_CAT_SCHEDULING,
"needed to invent a DISCONT %p (no time) for %s:%s => %s:%s", event,
GST_DEBUG_PAD_NAME (GST_PAD_PEER (pad)), GST_DEBUG_PAD_NAME (pad));
}
return GST_DATA (event);
}
/**
* gst_pad_push:
* @pad: a source #GstPad.
* @data: the #GstData to push.
*
* Pushes a buffer or an event to the peer of @pad. @pad must be linked. May
* only be called by @pad's parent.
*/
void
gst_pad_push (GstPad * pad, GstData * data)
{
GstRealPad *peer;
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
g_return_if_fail (!GST_FLAG_IS_SET (GST_PAD_REALIZE (pad),
GST_RPAD_IN_GETFUNC));
g_return_if_fail (data != NULL);
DEBUG_DATA (pad, data, "gst_pad_push");
if (!gst_probe_dispatcher_dispatch (&(GST_REAL_PAD (pad)->probedisp), &data)) {
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"not pushing data %p, blocked by probe", data);
gst_data_unref (data);
return;
}
if (!GST_PAD_IS_LINKED (pad)) {
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"not pushing data %p as pad is unconnected", data);
gst_data_unref (data);
return;
}
if (GST_IS_BUFFER (data) && !gst_pad_is_negotiated (pad)) {
g_warning ("pushing data on non-negotiated pad %s:%s, not allowed.",
GST_DEBUG_PAD_NAME (pad));
gst_data_unref (data);
return;
}
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "pushing");
peer = GST_RPAD_PEER (pad);
if (!peer) {
g_warning ("push on pad %s:%s but it is unlinked",
GST_DEBUG_PAD_NAME (pad));
} else {
if (!GST_IS_EVENT (data) && !GST_PAD_IS_ACTIVE (peer)) {
g_warning ("push on peer of pad %s:%s but peer is not active",
GST_DEBUG_PAD_NAME (pad));
return;
}
if (peer->chainhandler) {
if (data) {
if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) {
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"not pushing data %p, blocked by probe", data);
gst_data_unref (data);
return;
}
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"calling chainhandler &%s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->chainhandler),
GST_DEBUG_PAD_NAME (GST_PAD (peer)));
(peer->chainhandler) (GST_PAD (peer), data);
return;
} else {
g_warning ("trying to push a NULL buffer on pad %s:%s",
GST_DEBUG_PAD_NAME (peer));
return;
}
} else {
g_warning ("internal error: push on pad %s:%s but it has no chainhandler",
GST_DEBUG_PAD_NAME (peer));
}
}
/* clean up the mess here */
if (data != NULL)
gst_data_unref (data);
}
/**
* gst_pad_pull:
* @pad: a sink #GstPad.
*
* Pulls an event or a buffer from the peer pad. May only be called by @pad's
* parent.
*
* Returns: a new #GstData from the peer pad.
*/
GstData *
gst_pad_pull (GstPad * pad)
{
GstRealPad *peer;
GstData *data;
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK,
GST_DATA (gst_event_new (GST_EVENT_INTERRUPT)));
g_return_val_if_fail (!GST_FLAG_IS_SET (GST_PAD_REALIZE (pad),
GST_RPAD_IN_CHAINFUNC),
GST_DATA (gst_event_new (GST_EVENT_INTERRUPT)));
peer = GST_RPAD_PEER (pad);
if (!peer) {
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
("pull on pad %s:%s but it was unlinked", GST_DEBUG_PAD_NAME (pad)));
} else {
restart:
if (peer->gethandler) {
GstPadLink *link = GST_RPAD_LINK (pad);
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"calling gethandler %s of peer pad %s:%s",
GST_DEBUG_FUNCPTR_NAME (peer->gethandler), GST_DEBUG_PAD_NAME (peer));
if (link->temp_store) {
g_assert (link->engaged);
GST_DEBUG ("moving temp_store %p to data", link->temp_store);
data = link->temp_store;
link->temp_store = NULL;
} else {
data = (peer->gethandler) (GST_PAD (peer));
/* refetch - we might have been relinked */
link = GST_RPAD_LINK (pad);
peer = GST_RPAD_PEER (pad);
}
if (data) {
if (!link->engaged) {
g_assert (link->temp_store == NULL);
if (GST_IS_BUFFER (data)) {
GST_DEBUG ("moving data buffer %p back to temp_store", data);
link->temp_store = data;
link->engaged = TRUE;
data = _invent_event (pad, GST_BUFFER (data));
} else if (GST_IS_EVENT (data) &&
GST_EVENT_TYPE (data) == GST_EVENT_DISCONTINUOUS &&
GST_EVENT_DISCONT_NEW_MEDIA (data)) {
link->engaged = TRUE;
GST_CAT_LOG (GST_CAT_SCHEDULING,
"link engaged by discont event %p for pad %s:%s", data,
GST_DEBUG_PAD_NAME (pad));
}
}
GST_DEBUG ("calling gst_probe_dispatcher_dispatch on data %p", data);
if (!gst_probe_dispatcher_dispatch (&peer->probedisp, &data)) {
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
"not returning pulled data %p, blocked by probe", data);
gst_data_unref (data);
goto restart;
}
DEBUG_DATA (pad, data, "gst_pad_pull returned");
return data;
}
/* no null buffers allowed */
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
("NULL buffer during pull on %s:%s", GST_DEBUG_PAD_NAME (pad)));
} else {
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
("pull on pad %s:%s but the peer pad %s:%s has no gethandler",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer)));
}
}
data = GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
DEBUG_DATA (pad, data, "gst_pad_pull returned created");
return data;
}
GstData *
gst_pad_collect_array (GstScheduler * scheduler, GstPad ** selected,
GstPad ** padlist)
{
GstSchedulerClass *klass = GST_SCHEDULER_GET_CLASS (scheduler);
if (!GST_FLAG_IS_SET (scheduler, GST_SCHEDULER_FLAG_NEW_API) ||
!klass->pad_select) {
/* better randomness? */
if (selected)
*selected = padlist[0];
return gst_pad_pull (padlist[0]);
} else {
GstPad *select;
return klass->pad_select (scheduler, selected ? selected : &select,
padlist);
}
}
/**
* gst_pad_collectv:
* @selected: set to the pad the buffer comes from if not NULL
* @padlist: a #GList of sink pads.
*
* Waits for a buffer on any of the list of pads. Each #GstPad in @padlist must
* belong to the same element and be owned by the caller.
*
* Returns: the #GstData that was available
*/
GstData *
gst_pad_collectv (GstPad ** selected, const GList * padlist)
{
/* need to use alloca here because we must not leak data */
GstPad **pads;
GstPad *test;
GstElement *element = NULL;
int i = 0;
g_return_val_if_fail (padlist != NULL, NULL);
pads = g_alloca (sizeof (gpointer) * (g_list_length ((GList *) padlist) + 1));
for (; padlist; padlist = g_list_next (padlist)) {
test = GST_PAD (padlist->data);
g_return_val_if_fail (GST_IS_PAD (test), NULL);
g_return_val_if_fail (GST_PAD_IS_SINK (test), NULL);
if (element) {
g_return_val_if_fail (element == gst_pad_get_parent (test), NULL);
} else {
element = gst_pad_get_parent (test);
}
pads[i++] = test;
}
pads[i] = NULL;
return gst_pad_collect_array (GST_ELEMENT_SCHEDULER (element), selected,
pads);
}
/**
* gst_pad_collect:
* @selected: set to the pad the buffer comes from if not NULL
* @pad: first pad
* @...: more sink pads.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstData that was available.
*/
GstData *
gst_pad_collect (GstPad ** selected, GstPad * pad, ...)
{
GstData *result;
va_list var_args;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
va_start (var_args, pad);
result = gst_pad_collect_valist (selected, pad, var_args);
va_end (var_args);
return result;
}
/**
* gst_pad_collect_valist:
* @selected: set to the pad the buffer comes from if not NULL
* @pad: first pad
* @...: more sink pads.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstData that was available.
*/
GstData *
gst_pad_collect_valist (GstPad ** selected, GstPad * pad, va_list var_args)
{
GstPad **padlist;
GstElement *element = NULL;
gint i = 0, maxlength;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
element = gst_pad_get_parent (pad);
maxlength = element->numsinkpads;
/* can we make this list a bit smaller than this upper limit? */
padlist = g_alloca (sizeof (gpointer) * (maxlength + 1));
while (pad) {
g_return_val_if_fail (i < maxlength, NULL);
g_return_val_if_fail (element == gst_pad_get_parent (pad), NULL);
padlist[i++] = pad;
pad = va_arg (var_args, GstPad *);
}
padlist[i] = NULL;
return gst_pad_collect_array (GST_ELEMENT_SCHEDULER (element), selected,
padlist);
}
/**
* gst_pad_selectv:
* @padlist: a #GList of sink pads.
*
* Waits for a buffer on any of the list of pads. Each #GstPad in @padlist must
* be owned by the calling code.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad *
gst_pad_selectv (GList * padlist)
{
return NULL;
}
/**
* gst_pad_select_valist:
* @pad: a first #GstPad to perform the select on.
* @varargs: A va_list of more pads to select on.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad *
gst_pad_select_valist (GstPad * pad, va_list var_args)
{
GstPad *result;
GList *padlist = NULL;
if (pad == NULL)
return NULL;
while (pad) {
padlist = g_list_prepend (padlist, pad);
pad = va_arg (var_args, GstPad *);
}
result = gst_pad_selectv (padlist);
g_list_free (padlist);
return result;
}
/**
* gst_pad_select:
* @pad: a first sink #GstPad to perform the select on.
* @...: A NULL-terminated list of more pads to select on.
*
* Waits for a buffer on the given set of pads.
*
* Returns: the #GstPad that has a buffer available.
* Use #gst_pad_pull() to get the buffer.
*/
GstPad *
gst_pad_select (GstPad * pad, ...)
{
GstPad *result;
va_list var_args;
if (pad == NULL)
return NULL;
va_start (var_args, pad);
result = gst_pad_select_valist (pad, var_args);
va_end (var_args);
return result;
}
/************************************************************************
*
* templates
*
*/
static void gst_pad_template_class_init (GstPadTemplateClass * klass);
static void gst_pad_template_init (GstPadTemplate * templ);
static void gst_pad_template_dispose (GObject * object);
GType
gst_pad_template_get_type (void)
{
static GType padtemplate_type = 0;
if (!padtemplate_type) {
static const GTypeInfo padtemplate_info = {
sizeof (GstPadTemplateClass), NULL, NULL,
(GClassInitFunc) gst_pad_template_class_init, NULL, NULL,
sizeof (GstPadTemplate),
0,
(GInstanceInitFunc) gst_pad_template_init, NULL
};
padtemplate_type =
g_type_register_static (GST_TYPE_OBJECT, "GstPadTemplate",
&padtemplate_info, 0);
}
return padtemplate_type;
}
static void
gst_pad_template_class_init (GstPadTemplateClass * klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
padtemplate_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
gst_pad_template_signals[TEMPL_PAD_CREATED] =
g_signal_new ("pad-created", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstPadTemplateClass, pad_created),
NULL, NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
gobject_class->dispose = gst_pad_template_dispose;
gstobject_class->path_string_separator = "*";
}
static void
gst_pad_template_init (GstPadTemplate * templ)
{
}
static void
gst_pad_template_dispose (GObject * object)
{
GstPadTemplate *templ = GST_PAD_TEMPLATE (object);
g_free (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ));
if (GST_PAD_TEMPLATE_CAPS (templ)) {
gst_caps_unref (GST_PAD_TEMPLATE_CAPS (templ));
}
G_OBJECT_CLASS (padtemplate_parent_class)->dispose (object);
}
/* ALWAYS padtemplates cannot have conversion specifications, it doesn't make
* sense.
* SOMETIMES padtemplates can do whatever they want, they are provided by the
* element.
* REQUEST padtemplates can be reverse-parsed (the user asks for 'sink1', the
* 'sink%d' template is automatically selected), so we need to restrict their
* naming.
*/
static gboolean
name_is_valid (const gchar * name, GstPadPresence presence)
{
const gchar *str;
if (presence == GST_PAD_ALWAYS) {
if (strchr (name, '%')) {
g_warning ("invalid name template %s: conversion specifications are not"
" allowed for GST_PAD_ALWAYS padtemplates", name);
return FALSE;
}
} else if (presence == GST_PAD_REQUEST) {
if ((str = strchr (name, '%')) && strchr (str + 1, '%')) {
g_warning ("invalid name template %s: only one conversion specification"
" allowed in GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 1) != 's' && *(str + 1) != 'd')) {
g_warning ("invalid name template %s: conversion specification must be of"
" type '%%d' or '%%s' for GST_PAD_REQUEST padtemplate", name);
return FALSE;
}
if (str && (*(str + 2) != '\0')) {
g_warning ("invalid name template %s: conversion specification must"
" appear at the end of the GST_PAD_REQUEST padtemplate name", name);
return FALSE;
}
}
return TRUE;
}
/**
* gst_static_pad_template_get:
* @pad_template: the static pad template
*
* Converts a #GstStaticPadTemplate into a #GstPadTemplate.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_static_pad_template_get (GstStaticPadTemplate * pad_template)
{
GstPadTemplate *new;
if (!name_is_valid (pad_template->name_template, pad_template->presence))
return NULL;
new = g_object_new (gst_pad_template_get_type (),
"name", pad_template->name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (pad_template->name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = pad_template->direction;
GST_PAD_TEMPLATE_PRESENCE (new) = pad_template->presence;
GST_PAD_TEMPLATE_CAPS (new) =
gst_caps_copy (gst_static_caps_get (&pad_template->static_caps));
return new;
}
/**
* gst_pad_template_new:
* @name_template: the name template.
* @direction: the #GstPadDirection of the template.
* @presence: the #GstPadPresence of the pad.
* @caps: a #GstCaps set for the template. The caps are taken ownership of.
*
* Creates a new pad template with a name according to the given template
* and with the given arguments. This functions takes ownership of the provided
* caps, so be sure to not use them afterwards.
*
* Returns: a new #GstPadTemplate.
*/
GstPadTemplate *
gst_pad_template_new (const gchar * name_template,
GstPadDirection direction, GstPadPresence presence, GstCaps * caps)
{
GstPadTemplate *new;
g_return_val_if_fail (name_template != NULL, NULL);
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (direction == GST_PAD_SRC
|| direction == GST_PAD_SINK, NULL);
g_return_val_if_fail (presence == GST_PAD_ALWAYS
|| presence == GST_PAD_SOMETIMES || presence == GST_PAD_REQUEST, NULL);
if (!name_is_valid (name_template, presence))
return NULL;
new = g_object_new (gst_pad_template_get_type (),
"name", name_template, NULL);
GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name_template);
GST_PAD_TEMPLATE_DIRECTION (new) = direction;
GST_PAD_TEMPLATE_PRESENCE (new) = presence;
GST_PAD_TEMPLATE_CAPS (new) = caps;
return new;
}
/**
* gst_pad_template_get_caps:
* @templ: a #GstPadTemplate to get capabilities of.
*
* Gets the capabilities of the pad template.
*
* Returns: the #GstCaps of the pad template. If you need to keep a reference to
* the caps, make a copy (see gst_caps_copy ()).
*/
const GstCaps *
gst_pad_template_get_caps (GstPadTemplate * templ)
{
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
return GST_PAD_TEMPLATE_CAPS (templ);
}
/**
* gst_pad_set_element_private:
* @pad: the #GstPad to set the private data of.
* @priv: The private data to attach to the pad.
*
* Set the given private data gpointer on the pad.
* This function can only be used by the element that owns the pad.
*/
void
gst_pad_set_element_private (GstPad * pad, gpointer priv)
{
pad->element_private = priv;
}
/**
* gst_pad_get_element_private:
* @pad: the #GstPad to get the private data of.
*
* Gets the private data of a pad.
*
* Returns: a #gpointer to the private data.
*/
gpointer
gst_pad_get_element_private (GstPad * pad)
{
return pad->element_private;
}
/***** ghost pads *****/
GType _gst_ghost_pad_type = 0;
static void gst_ghost_pad_class_init (GstGhostPadClass * klass);
static void gst_ghost_pad_init (GstGhostPad * pad);
static void gst_ghost_pad_dispose (GObject * object);
static void gst_ghost_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ghost_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static GstPad *ghost_pad_parent_class = NULL;
/* static guint gst_ghost_pad_signals[LAST_SIGNAL] = { 0 }; */
enum
{
GPAD_ARG_0,
GPAD_ARG_REAL_PAD
/* fill me */
};
GType
gst_ghost_pad_get_type (void)
{
if (!_gst_ghost_pad_type) {
static const GTypeInfo pad_info = {
sizeof (GstGhostPadClass), NULL, NULL,
(GClassInitFunc) gst_ghost_pad_class_init, NULL, NULL,
sizeof (GstGhostPad),
0,
(GInstanceInitFunc) gst_ghost_pad_init,
NULL
};
_gst_ghost_pad_type = g_type_register_static (GST_TYPE_PAD, "GstGhostPad",
&pad_info, 0);
}
return _gst_ghost_pad_type;
}
static void
gst_ghost_pad_class_init (GstGhostPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
ghost_pad_parent_class = g_type_class_ref (GST_TYPE_PAD);
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_ghost_pad_dispose);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_ghost_pad_get_property);
g_object_class_install_property (gobject_class, GPAD_ARG_REAL_PAD,
g_param_spec_object ("real-pad", "Real pad",
"The real pad for the ghost pad", GST_TYPE_PAD, G_PARAM_READWRITE));
}
static void
gst_ghost_pad_init (GstGhostPad * pad)
{
/* zeroed by glib */
}
static void
gst_ghost_pad_dispose (GObject * object)
{
g_object_set (object, "real-pad", NULL, NULL);
G_OBJECT_CLASS (ghost_pad_parent_class)->dispose (object);
}
static void
gst_ghost_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstPad *ghostpad = (GstPad *) object;
GstPad *oldrealpad = (GstPad *) GST_GPAD_REALPAD (ghostpad);
GstPad *realpad = NULL;
switch (prop_id) {
case GPAD_ARG_REAL_PAD:
realpad = g_value_get_object (value);
if (oldrealpad) {
if (realpad == oldrealpad)
return;
else
gst_pad_remove_ghost_pad (oldrealpad, ghostpad);
}
if (realpad)
gst_pad_add_ghost_pad (realpad, ghostpad);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ghost_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
switch (prop_id) {
case GPAD_ARG_REAL_PAD:
g_value_set_object (value, GST_GPAD_REALPAD (object));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_ghost_pad_new:
* @name: the name of the new ghost pad.
* @pad: the #GstPad to create a ghost pad for.
*
* Creates a new ghost pad associated with @pad, and named @name. If @name is
* %NULL, a guaranteed unique name (across all ghost pads) will be assigned.
*
* Returns: a new ghost #GstPad, or %NULL in case of an error.
*/
GstPad *
gst_ghost_pad_new (const gchar * name, GstPad * pad)
{
GstPad *gpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gpad = g_object_new (GST_TYPE_GHOST_PAD, "name", name, "real-pad", pad, NULL);
GST_CAT_DEBUG (GST_CAT_PADS, "created ghost pad \"%s\" for pad %s:%s",
GST_OBJECT_NAME (gpad), GST_DEBUG_PAD_NAME (pad));
return gpad;
}
/**
* gst_pad_get_internal_links_default:
* @pad: the #GstPad to get the internal links of.
*
* Gets a list of pads to which the given pad is linked to
* inside of the parent element.
* This is the default handler, and thus returns a list of all of the
* pads inside the parent element with opposite direction.
* The caller must free this list after use.
*
* Returns: a newly allocated #GList of pads.
*/
GList *
gst_pad_get_internal_links_default (GstPad * pad)
{
GList *res = NULL;
GstElement *parent;
GList *parent_pads;
GstPadDirection direction;
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
direction = rpad->direction;
parent = GST_PAD_PARENT (rpad);
parent_pads = parent->pads;
while (parent_pads) {
GstRealPad *parent_pad = GST_PAD_REALIZE (parent_pads->data);
if (parent_pad->direction != direction) {
res = g_list_prepend (res, parent_pad);
}
parent_pads = g_list_next (parent_pads);
}
return res;
}
/**
* gst_pad_get_internal_links:
* @pad: the #GstPad to get the internal links of.
*
* Gets a list of pads to which the given pad is linked to
* inside of the parent element.
* The caller must free this list after use.
*
* Returns: a newly allocated #GList of pads.
*/
GList *
gst_pad_get_internal_links (GstPad * pad)
{
GList *res = NULL;
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_INTLINKFUNC (rpad))
res = GST_RPAD_INTLINKFUNC (rpad) (GST_PAD_CAST (rpad));
return res;
}
static gboolean
gst_pad_event_default_dispatch (GstPad * pad, GstElement * element,
GstEvent * event)
{
GList *orig, *pads;
GST_INFO_OBJECT (pad, "Sending event %p to all internally linked pads",
event);
orig = pads = gst_pad_get_internal_links (pad);
while (pads) {
GstPad *eventpad = GST_PAD (pads->data);
pads = g_list_next (pads);
/* for all of the internally-linked pads that are actually linked */
if (GST_PAD_IS_LINKED (eventpad)) {
if (GST_PAD_DIRECTION (eventpad) == GST_PAD_SRC) {
/* for each pad we send to, we should ref the event; it's up
* to downstream to unref again when handled. */
GST_LOG_OBJECT (pad, "Reffing and sending event %p to %s:%s", event,
GST_DEBUG_PAD_NAME (eventpad));
gst_event_ref (event);
gst_pad_push (eventpad, GST_DATA (event));
} else {
GstPad *peerpad = GST_PAD (GST_RPAD_PEER (eventpad));
/* we only send the event on one pad, multi-sinkpad elements
* should implement a handler */
g_list_free (orig);
GST_LOG_OBJECT (pad, "sending event %p to one sink pad %s:%s", event,
GST_DEBUG_PAD_NAME (eventpad));
return gst_pad_send_event (peerpad, event);
}
}
}
/* we handled the incoming event so we unref once */
GST_LOG_OBJECT (pad, "handled event %p, unreffing", event);
gst_event_unref (event);
g_list_free (orig);
return (GST_PAD_DIRECTION (pad) == GST_PAD_SINK);
}
/**
* gst_pad_event_default:
* @pad: a #GstPad to call the default event handler on.
* @event: the #GstEvent to handle.
*
* Invokes the default event handler for the given pad. End-of-stream and
* discontinuity events are handled specially, and then the event is sent to all
* pads internally linked to @pad. Note that if there are many possible sink
* pads that are internally linked to @pad, only one will be sent an event.
* Multi-sinkpad elements should implement custom event handlers.
*
* Returns: TRUE if the event was sent succesfully.
*/
gboolean
gst_pad_event_default (GstPad * pad, GstEvent * event)
{
GstElement *element;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
element = GST_PAD_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
gst_pad_event_default_dispatch (pad, element, event);
gst_element_set_eos (element);
break;
case GST_EVENT_DISCONTINUOUS:
{
guint64 time;
if (gst_element_requires_clock (element) && element->clock) {
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
gst_element_set_time (element, time);
} else {
GstFormat format = GST_FORMAT_TIME;
guint i;
for (i = 0; i < event->event_data.discont.noffsets; i++) {
if (gst_pad_convert (pad,
event->event_data.discont.offsets[i].format,
event->event_data.discont.offsets[i].value, &format,
&time)) {
gst_element_set_time (element, time);
} else if (i == event->event_data.discont.noffsets) {
g_warning
("can't adjust clock to new time when time not provided");
}
}
}
}
}
default:
return gst_pad_event_default_dispatch (pad, element, event);
}
return TRUE;
}
/**
* gst_pad_dispatcher:
* @pad: a #GstPad to dispatch.
* @dispatch: the #GstDispatcherFunction to call.
* @data: gpointer user data passed to the dispatcher function.
*
* Invokes the given dispatcher function on all pads that are
* internally linked to the given pad.
* The GstPadDispatcherFunction should return TRUE when no further pads
* need to be processed.
*
* Returns: TRUE if one of the dispatcher functions returned TRUE.
*/
gboolean
gst_pad_dispatcher (GstPad * pad, GstPadDispatcherFunction dispatch,
gpointer data)
{
gboolean res = FALSE;
GList *int_pads, *orig;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (dispatch != NULL, FALSE);
orig = int_pads = gst_pad_get_internal_links (pad);
while (int_pads) {
GstRealPad *int_rpad = GST_PAD_REALIZE (int_pads->data);
GstRealPad *int_peer = GST_RPAD_PEER (int_rpad);
if (int_peer) {
res = dispatch (GST_PAD (int_peer), data);
if (res)
break;
}
int_pads = g_list_next (int_pads);
}
g_list_free (orig);
return res;
}
/**
* gst_pad_send_event:
* @pad: a #GstPad to send the event to.
* @event: the #GstEvent to send to the pad.
*
* Sends the event to the pad.
*
* Returns: TRUE if the event was handled.
*/
gboolean
gst_pad_send_event (GstPad * pad, GstEvent * event)
{
gboolean success = FALSE;
GstRealPad *rpad;
GstElement *parent;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
parent = gst_pad_get_parent (pad);
g_return_val_if_fail (GST_STATE (parent) >= GST_STATE_PAUSED, FALSE);
rpad = GST_PAD_REALIZE (pad);
if (GST_EVENT_SRC (event) == NULL)
GST_EVENT_SRC (event) = gst_object_ref (GST_OBJECT (rpad));
GST_CAT_DEBUG (GST_CAT_EVENT, "have event type %d on pad %s:%s",
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (rpad));
if (GST_RPAD_EVENTHANDLER (rpad))
success = GST_RPAD_EVENTHANDLER (rpad) (GST_PAD (rpad), event);
else {
g_warning ("pad %s:%s has no event handler", GST_DEBUG_PAD_NAME (rpad));
gst_event_unref (event);
}
return success;
}
typedef struct
{
GstFormat src_format;
gint64 src_value;
GstFormat *dest_format;
gint64 *dest_value;
}
GstPadConvertData;
static gboolean
gst_pad_convert_dispatcher (GstPad * pad, GstPadConvertData * data)
{
return gst_pad_convert (pad, data->src_format, data->src_value,
data->dest_format, data->dest_value);
}
/**
* gst_pad_convert_default:
* @pad: a #GstPad to invoke the default converter on.
* @src_format: the source #GstFormat.
* @src_value: the source value.
* @dest_format: a pointer to the destination #GstFormat.
* @dest_value: a pointer to the destination value.
*
* Invokes the default converter on a pad.
* This will forward the call to the pad obtained
* using the internal link of
* the element.
*
* Returns: TRUE if the conversion could be performed.
*/
gboolean
gst_pad_convert_default (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
GstPadConvertData data;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (dest_format != NULL, FALSE);
g_return_val_if_fail (dest_value != NULL, FALSE);
data.src_format = src_format;
data.src_value = src_value;
data.dest_format = dest_format;
data.dest_value = dest_value;
return gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_convert_dispatcher, &data);
}
/**
* gst_pad_convert:
* @pad: a #GstPad to invoke the default converter on.
* @src_format: the source #GstFormat.
* @src_value: the source value.
* @dest_format: a pointer to the destination #GstFormat.
* @dest_value: a pointer to the destination value.
*
* Invokes a conversion on the pad.
*
* Returns: TRUE if the conversion could be performed.
*/
gboolean
gst_pad_convert (GstPad * pad,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (dest_format != NULL, FALSE);
g_return_val_if_fail (dest_value != NULL, FALSE);
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_CONVERTFUNC (rpad)) {
return GST_RPAD_CONVERTFUNC (rpad) (GST_PAD (rpad), src_format,
src_value, dest_format, dest_value);
}
return FALSE;
}
typedef struct
{
GstQueryType type;
GstFormat *format;
gint64 *value;
}
GstPadQueryData;
static gboolean
gst_pad_query_dispatcher (GstPad * pad, GstPadQueryData * data)
{
return gst_pad_query (pad, data->type, data->format, data->value);
}
/**
* gst_pad_query_default:
* @pad: a #GstPad to invoke the default query on.
* @type: the #GstQueryType of the query to perform.
* @format: a pointer to the #GstFormat of the result.
* @value: a pointer to the result.
*
* Invokes the default query function on a pad.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query_default (GstPad * pad, GstQueryType type,
GstFormat * format, gint64 * value)
{
GstPadQueryData data;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (format != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
data.type = type;
data.format = format;
data.value = value;
return gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_query_dispatcher, &data);
}
/**
* gst_pad_query:
* @pad: a #GstPad to invoke the default query on.
* @type: the #GstQueryType of the query to perform.
* @format: a pointer to the #GstFormat asked for.
* On return contains the #GstFormat used.
* @value: a pointer to the result.
*
* Queries a pad for one of the available properties. The format will be
* adjusted to the actual format used when specifying formats such as
* GST_FORMAT_DEFAULT.
* FIXME: Tell if the format can be adjusted when specifying a definite format.
*
* Returns: TRUE if the query could be performed.
*/
gboolean
gst_pad_query (GstPad * pad, GstQueryType type,
GstFormat * format, gint64 * value)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_return_val_if_fail (format != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
rpad = GST_PAD_REALIZE (pad);
g_return_val_if_fail (rpad, FALSE);
if (GST_RPAD_QUERYFUNC (rpad))
return GST_RPAD_QUERYFUNC (rpad) (GST_PAD_CAST (rpad), type, format, value);
return FALSE;
}
static gboolean
gst_pad_get_formats_dispatcher (GstPad * pad, const GstFormat ** data)
{
*data = gst_pad_get_formats (pad);
return TRUE;
}
/**
* gst_pad_get_formats_default:
* @pad: a #GstPad to query
*
* Invoke the default format dispatcher for the pad.
*
* Returns: An array of GstFormats ended with a 0 value.
*/
const GstFormat *
gst_pad_get_formats_default (GstPad * pad)
{
GstFormat *result = NULL;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
gst_pad_dispatcher (pad, (GstPadDispatcherFunction)
gst_pad_get_formats_dispatcher, &result);
return result;
}
/**
* gst_pad_get_formats:
* @pad: a #GstPad to query
*
* Gets the list of supported formats from the pad.
*
* Returns: An array of GstFormats ended with a 0 value.
*/
const GstFormat *
gst_pad_get_formats (GstPad * pad)
{
GstRealPad *rpad;
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
rpad = GST_PAD_REALIZE (pad);
if (GST_RPAD_FORMATSFUNC (rpad))
return GST_RPAD_FORMATSFUNC (rpad) (GST_PAD (pad));
return NULL;
}
#define CALL_CHAINFUNC(pad, data) G_STMT_START {\
GstData *__temp = (data); \
DEBUG_DATA (pad, __temp, "calling chain function with "); \
if (GST_IS_EVENT (__temp) && \
!GST_FLAG_IS_SET (gst_pad_get_parent (pad), GST_ELEMENT_EVENT_AWARE)) { \
gst_pad_send_event (pad, GST_EVENT (__temp)); \
} else { \
GST_FLAG_SET (pad, GST_RPAD_IN_CHAINFUNC); \
GST_RPAD_CHAINFUNC (pad) (pad, __temp); \
GST_FLAG_UNSET (pad, GST_RPAD_IN_CHAINFUNC); \
} \
}G_STMT_END
/**
* gst_pad_call_chain_function:
* @pad: sink pad to call chain function on
* @data: data to call the chain function with
*
* Calls the chain function of the given pad while making sure the internal
* consistency is kept. Use this function inside schedulers instead of calling
* the chain function yourself.
*/
void
gst_pad_call_chain_function (GstPad * pad, GstData * data)
{
GstPadLink *link;
g_return_if_fail (GST_IS_REAL_PAD (pad));
g_return_if_fail (GST_PAD_IS_SINK (pad));
g_return_if_fail (data != NULL);
g_return_if_fail (GST_RPAD_CHAINFUNC (pad) != NULL);
g_return_if_fail (GST_RPAD_LINK (pad) != NULL);
link = GST_RPAD_LINK (pad);
if (!link->engaged) {
g_assert (link->temp_store == NULL);
if (GST_IS_BUFFER (data)) {
GST_DEBUG ("moving data buffer %p back to temp_store", data);
link->temp_store = data;
link->engaged = TRUE;
CALL_CHAINFUNC (pad, _invent_event (pad, GST_BUFFER (data)));
link = GST_RPAD_LINK (pad);
if (link->temp_store == NULL) /* happens after relinking in chainfunc */
return;
g_assert (link->temp_store == data);
link->temp_store = NULL;
} else if (GST_IS_EVENT (data) &&
GST_EVENT_TYPE (data) == GST_EVENT_DISCONTINUOUS &&
GST_EVENT_DISCONT_NEW_MEDIA (data)) {
link->engaged = TRUE;
GST_CAT_LOG (GST_CAT_SCHEDULING,
"link engaged by discont event %p for pad %s:%s", data,
GST_DEBUG_PAD_NAME (pad));
}
}
CALL_CHAINFUNC (pad, data);
}
/**
* gst_pad_call_get_function:
* @pad: sink pad to call chain function on
*
* Calls the get function of the given pad while making sure the internal
* consistency is kept. Use this function inside schedulers instead of calling
* the get function yourself.
*
* Returns: the data provided by the pad or NULL if no data was available.
*/
GstData *
gst_pad_call_get_function (GstPad * pad)
{
GstData *data;
g_return_val_if_fail (GST_IS_REAL_PAD (pad), NULL);
g_return_val_if_fail (GST_PAD_IS_SRC (pad), NULL);
g_return_val_if_fail (GST_RPAD_GETFUNC (pad) != NULL, NULL);
GST_FLAG_SET (pad, GST_RPAD_IN_GETFUNC);
data = GST_RPAD_GETFUNC (pad) (pad);
GST_FLAG_UNSET (pad, GST_RPAD_IN_GETFUNC);
DEBUG_DATA (pad, data, "getfunction returned");
return data;
}
Reference in a new issue View git blame Copy permalink