mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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f7c0c25d58
Original commit message from CVS: * gst/base/gstbasetransform.c: (gst_base_transform_setcaps): Added more debug info in the negotiate process. * gst/gstmessage.h: Prepare for segment playback. * gst/gstpad.c: (gst_pad_accept_caps), (gst_pad_set_caps): Better debugging. * gst/gstutils.c: Some more docs. * tools/gst-launch.c: (main): NULL pipeline on errors.
3672 lines
94 KiB
C
3672 lines
94 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstpad.c: Pads for linking elements together
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gst_private.h"
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#include "gstpad.h"
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#include "gstenumtypes.h"
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#include "gstmarshal.h"
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#include "gstutils.h"
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#include "gstelement.h"
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#include "gstbin.h"
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#include "gstscheduler.h"
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#include "gstevent.h"
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#include "gstinfo.h"
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#include "gsterror.h"
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#include "gstvalue.h"
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GST_DEBUG_CATEGORY_STATIC (debug_dataflow);
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#define DEBUG_DATA(obj,data,notice) G_STMT_START{\
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if (!data) { \
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GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "NULL data value"); \
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} else if (GST_IS_EVENT (data)) { \
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GST_CAT_DEBUG_OBJECT (debug_dataflow, obj, "%s event %p (type %d, refcount %d)", notice, data, \
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GST_EVENT_TYPE (data), GST_DATA_REFCOUNT_VALUE (data)); \
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} else { \
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GST_CAT_LOG_OBJECT (debug_dataflow, obj, "%s buffer %p (size %u, refcount %d)", notice, data, \
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GST_BUFFER_SIZE (data), GST_BUFFER_REFCOUNT_VALUE (data)); \
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} \
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}G_STMT_END
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#define GST_CAT_DEFAULT GST_CAT_PADS
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enum
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{
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TEMPL_PAD_CREATED,
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/* FILL ME */
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TEMPL_LAST_SIGNAL
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};
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static GstObject *padtemplate_parent_class = NULL;
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static guint gst_pad_template_signals[TEMPL_LAST_SIGNAL] = { 0 };
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/* Pad signals and args */
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enum
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{
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PAD_LINKED,
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PAD_UNLINKED,
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PAD_REQUEST_LINK,
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PAD_HAVE_DATA,
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/* FILL ME */
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PAD_LAST_SIGNAL
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};
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enum
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{
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PAD_PROP_0,
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PAD_PROP_CAPS,
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PAD_PROP_DIRECTION,
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PAD_PROP_TEMPLATE,
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/* FILL ME */
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};
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GType _gst_pad_type = 0;
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static void gst_pad_class_init (GstPadClass * klass);
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static void gst_pad_init (GstPad * pad);
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static void gst_pad_dispose (GObject * object);
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static void gst_pad_finalize (GObject * object);
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static void gst_pad_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_pad_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstCaps *gst_pad_get_caps_unlocked (GstPad * pad);
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static void gst_pad_set_pad_template (GstPad * pad, GstPadTemplate * templ);
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static gboolean gst_pad_activate_default (GstPad * pad);
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#ifndef GST_DISABLE_LOADSAVE
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static xmlNodePtr gst_pad_save_thyself (GstObject * object, xmlNodePtr parent);
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#endif
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static GstObjectClass *pad_parent_class = NULL;
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static guint gst_pad_signals[PAD_LAST_SIGNAL] = { 0 };
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GType
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gst_pad_get_type (void)
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{
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if (!_gst_pad_type) {
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static const GTypeInfo pad_info = {
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sizeof (GstPadClass), NULL, NULL,
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(GClassInitFunc) gst_pad_class_init, NULL, NULL,
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sizeof (GstPad),
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0,
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(GInstanceInitFunc) gst_pad_init, NULL
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};
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_gst_pad_type = g_type_register_static (GST_TYPE_OBJECT, "GstPad",
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&pad_info, 0);
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GST_DEBUG_CATEGORY_INIT (debug_dataflow, "GST_DATAFLOW",
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GST_DEBUG_BOLD | GST_DEBUG_FG_GREEN, "dataflow inside pads");
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}
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return _gst_pad_type;
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}
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static gboolean
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_gst_do_pass_data_accumulator (GSignalInvocationHint * ihint,
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GValue * return_accu, const GValue * handler_return, gpointer dummy)
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{
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gboolean ret = g_value_get_boolean (handler_return);
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GST_DEBUG ("accumulated %d", ret);
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g_value_set_boolean (return_accu, ret);
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return ret;
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}
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static gboolean
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default_have_data (GstPad * pad, GstMiniObject * o)
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{
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return TRUE;
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}
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static void
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gst_pad_class_init (GstPadClass * klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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gobject_class = (GObjectClass *) klass;
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gstobject_class = (GstObjectClass *) klass;
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pad_parent_class = g_type_class_ref (GST_TYPE_OBJECT);
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gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_pad_dispose);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_pad_finalize);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_pad_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_pad_get_property);
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gst_pad_signals[PAD_LINKED] =
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g_signal_new ("linked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstPadClass, linked), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
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gst_pad_signals[PAD_UNLINKED] =
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g_signal_new ("unlinked", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstPadClass, unlinked), NULL, NULL,
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gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
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gst_pad_signals[PAD_REQUEST_LINK] =
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g_signal_new ("request_link", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadClass, request_link), NULL,
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NULL, gst_marshal_VOID__OBJECT, G_TYPE_NONE, 0);
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gst_pad_signals[PAD_HAVE_DATA] =
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g_signal_new ("have-data", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstPadClass, have_data),
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_gst_do_pass_data_accumulator,
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NULL, gst_marshal_BOOLEAN__POINTER, G_TYPE_BOOLEAN, 1,
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GST_TYPE_MINI_OBJECT);
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g_object_class_install_property (G_OBJECT_CLASS (klass), PAD_PROP_CAPS,
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g_param_spec_boxed ("caps", "Caps", "The capabilities of the pad",
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GST_TYPE_CAPS, G_PARAM_READABLE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PAD_PROP_DIRECTION,
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g_param_spec_enum ("direction", "Direction", "The direction of the pad",
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GST_TYPE_PAD_DIRECTION, GST_PAD_UNKNOWN,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PAD_PROP_TEMPLATE,
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g_param_spec_object ("template", "Template",
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"The GstPadTemplate of this pad", GST_TYPE_PAD_TEMPLATE,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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#ifndef GST_DISABLE_LOADSAVE
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gstobject_class->save_thyself = GST_DEBUG_FUNCPTR (gst_pad_save_thyself);
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#endif
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gstobject_class->path_string_separator = ".";
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klass->have_data = default_have_data;
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}
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static void
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gst_pad_init (GstPad * pad)
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{
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pad->direction = GST_PAD_UNKNOWN;
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pad->peer = NULL;
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pad->chainfunc = NULL;
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pad->caps = NULL;
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pad->linkfunc = NULL;
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pad->getcapsfunc = NULL;
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pad->activatefunc = gst_pad_activate_default;
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pad->eventfunc = gst_pad_event_default;
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pad->querytypefunc = gst_pad_get_query_types_default;
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pad->queryfunc = gst_pad_query_default;
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pad->intlinkfunc = gst_pad_get_internal_links_default;
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pad->do_buffer_signals = 0;
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pad->do_event_signals = 0;
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GST_PAD_UNSET_FLUSHING (pad);
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pad->preroll_lock = g_mutex_new ();
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pad->preroll_cond = g_cond_new ();
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pad->stream_rec_lock = g_new (GStaticRecMutex, 1);
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g_static_rec_mutex_init (pad->stream_rec_lock);
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pad->block_cond = g_cond_new ();
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}
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static void
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gst_pad_dispose (GObject * object)
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{
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GstPad *pad = GST_PAD (object);
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gst_pad_set_pad_template (pad, NULL);
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/* FIXME, we have links to many other things like caps
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* and the peer pad... */
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/* No linked pad can ever be disposed.
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* It has to have a parent to be linked
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* and a parent would hold a reference */
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/* FIXME: what about if g_object_dispose is explicitly called on the pad? Is
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that legal? otherwise we could assert GST_OBJECT_PARENT (pad) == NULL as
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well... */
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g_assert (GST_PAD_PEER (pad) == NULL);
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GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "dispose %s:%s",
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GST_DEBUG_PAD_NAME (pad));
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/* clear the caps */
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gst_caps_replace (&GST_PAD_CAPS (pad), NULL);
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if (GST_IS_ELEMENT (GST_OBJECT_PARENT (pad))) {
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GST_CAT_DEBUG (GST_CAT_REFCOUNTING, "removing pad from element '%s'",
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GST_OBJECT_NAME (GST_OBJECT (GST_ELEMENT (GST_OBJECT_PARENT (pad)))));
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gst_element_remove_pad (GST_ELEMENT (GST_OBJECT_PARENT (pad)), pad);
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}
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G_OBJECT_CLASS (pad_parent_class)->dispose (object);
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}
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static void
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gst_pad_finalize (GObject * object)
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{
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GstPad *pad = GST_PAD (object);
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if (pad->stream_rec_lock) {
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g_static_rec_mutex_free (pad->stream_rec_lock);
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g_free (pad->stream_rec_lock);
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pad->stream_rec_lock = NULL;
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}
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if (pad->preroll_lock) {
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g_mutex_free (pad->preroll_lock);
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g_cond_free (pad->preroll_cond);
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pad->preroll_lock = NULL;
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pad->preroll_cond = NULL;
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}
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if (pad->block_cond) {
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g_cond_free (pad->block_cond);
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pad->block_cond = NULL;
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}
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G_OBJECT_CLASS (pad_parent_class)->finalize (object);
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}
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static void
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gst_pad_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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g_return_if_fail (GST_IS_PAD (object));
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switch (prop_id) {
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case PAD_PROP_DIRECTION:
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GST_PAD_DIRECTION (object) = g_value_get_enum (value);
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break;
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case PAD_PROP_TEMPLATE:
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gst_pad_set_pad_template (GST_PAD_CAST (object),
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(GstPadTemplate *) g_value_dup_object (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_pad_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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g_return_if_fail (GST_IS_PAD (object));
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switch (prop_id) {
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case PAD_PROP_CAPS:
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g_value_set_boxed (value, GST_PAD_CAPS (object));
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break;
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case PAD_PROP_DIRECTION:
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g_value_set_enum (value, GST_PAD_DIRECTION (object));
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break;
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case PAD_PROP_TEMPLATE:
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g_value_set_object (value, GST_PAD_TEMPLATE (object));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/**
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* gst_pad_new:
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* @name: the name of the new pad.
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* @direction: the #GstPadDirection of the pad.
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*
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* Creates a new pad with the given name in the given direction.
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* If name is NULL, a guaranteed unique name (across all pads)
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* will be assigned.
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* This function makes a copy of the name so you can safely free the name.
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*
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* Returns: a new #GstPad, or NULL in case of an error.
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*
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* MT safe.
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*/
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GstPad *
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gst_pad_new (const gchar * name, GstPadDirection direction)
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{
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return g_object_new (GST_TYPE_PAD,
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"name", name, "direction", direction, NULL);
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}
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/**
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* gst_pad_new_from_template:
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* @templ: the pad template to use
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* @name: the name of the element
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*
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* Creates a new pad with the given name from the given template.
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* If name is NULL, a guaranteed unique name (across all pads)
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* will be assigned.
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* This function makes a copy of the name so you can safely free the name.
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*
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* Returns: a new #GstPad, or NULL in case of an error.
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*/
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GstPad *
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gst_pad_new_from_template (GstPadTemplate * templ, const gchar * name)
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{
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g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
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return g_object_new (GST_TYPE_PAD,
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"name", name, "direction", templ->direction, "template", templ, NULL);
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}
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/**
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* gst_pad_get_parent:
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* @pad: a pad
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*
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* Gets the parent of @pad, cast to a #GstElement. If a @pad has no parent or
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* its parent is not an element, return NULL.
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*
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* Returns: The parent of the pad. The caller has a reference on the parent, so
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* unref when you're finished with it.
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*
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* MT safe.
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*/
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GstElement *
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gst_pad_get_parent (GstPad * pad)
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{
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GstObject *p;
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g_return_val_if_fail (GST_IS_PAD (pad), NULL);
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p = gst_object_get_parent (GST_OBJECT_CAST (pad));
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if (p && !GST_IS_ELEMENT (p)) {
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gst_object_unref (p);
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p = NULL;
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}
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return GST_ELEMENT_CAST (p);
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}
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/**
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* gst_pad_get_direction:
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* @pad: a #GstPad to get the direction of.
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*
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* Gets the direction of the pad. The direction of the pad is
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* decided at construction time so this function does not take
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* the LOCK.
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*
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* Returns: the #GstPadDirection of the pad.
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*
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* MT safe.
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*/
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GstPadDirection
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gst_pad_get_direction (GstPad * pad)
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{
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GstPadDirection result;
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/* PAD_UNKNOWN is a little silly but we need some sort of
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* error return value */
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g_return_val_if_fail (GST_IS_PAD (pad), GST_PAD_UNKNOWN);
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GST_LOCK (pad);
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result = GST_PAD_DIRECTION (pad);
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GST_UNLOCK (pad);
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return result;
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}
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static gboolean
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gst_pad_activate_default (GstPad * pad)
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{
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return gst_pad_activate_push (pad, TRUE);
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}
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static void
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pre_activate_switch (GstPad * pad, gboolean new_active)
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{
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if (new_active) {
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return;
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} else {
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GST_LOCK (pad);
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GST_PAD_SET_FLUSHING (pad);
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/* unlock blocked pads so element can resume and stop */
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GST_PAD_BLOCK_SIGNAL (pad);
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GST_UNLOCK (pad);
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}
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}
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static void
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post_activate_switch (GstPad * pad, gboolean new_active)
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{
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if (new_active) {
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GST_LOCK (pad);
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GST_PAD_UNSET_FLUSHING (pad);
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GST_UNLOCK (pad);
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} else {
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/* make streaming stop */
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GST_STREAM_LOCK (pad);
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GST_STREAM_UNLOCK (pad);
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}
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}
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/**
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* gst_pad_set_active:
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* @pad: the #GstPad to activate or deactivate.
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* @active: whether or not the pad should be active.
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*
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* Activates or deactivates the given pad. Must be called with the STATE_LOCK.
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* Normally called from within core state change functions.
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*
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* If @active, makes sure the pad is active. If it is already active, either in
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* push or pull mode, just return. Otherwise dispatches to the pad's activate
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* function to perform the actual activation.
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*
|
|
* If not @active, checks the pad's current mode and calls
|
|
* gst_pad_activate_push() or gst_pad_activate_pull(), as appropriate, with a
|
|
* FALSE argument.
|
|
*
|
|
* Returns: TRUE if the operation was successfull.
|
|
*
|
|
* MT safe. Must be called with STATE_LOCK.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_active (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old;
|
|
gboolean ret = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (active) {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PUSH:
|
|
case GST_ACTIVATE_PULL:
|
|
ret = TRUE;
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
ret = (GST_PAD_ACTIVATEFUNC (pad)) (pad);
|
|
break;
|
|
}
|
|
} else {
|
|
switch (old) {
|
|
case GST_ACTIVATE_PUSH:
|
|
ret = gst_pad_activate_push (pad, FALSE);
|
|
break;
|
|
case GST_ACTIVATE_PULL:
|
|
ret = gst_pad_activate_pull (pad, FALSE);
|
|
break;
|
|
case GST_ACTIVATE_NONE:
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_activate_pull:
|
|
* @pad: the #GstPad to activate or deactivate.
|
|
* @active: whether or not the pad should be active.
|
|
*
|
|
* Activates or deactivates the given pad in pull mode via dispatching to the
|
|
* pad's activatepullfunc. For use from within pad activation functions only.
|
|
* When called on sink pads, will first proxy the call to the peer pad, which is
|
|
* expected to activate its internally linked pads from within its activate_pull
|
|
* function.
|
|
*
|
|
* If you don't know what this is, you probably don't want to call it.
|
|
*
|
|
* Returns: TRUE if the operation was successfull.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_activate_pull (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if ((active && old == GST_ACTIVATE_PULL)
|
|
|| (!active && old == GST_ACTIVATE_NONE))
|
|
goto was_ok;
|
|
|
|
if (active) {
|
|
g_return_val_if_fail (old == GST_ACTIVATE_NONE, FALSE);
|
|
} else {
|
|
g_return_val_if_fail (old == GST_ACTIVATE_PULL, FALSE);
|
|
}
|
|
|
|
if (gst_pad_get_direction (pad) == GST_PAD_SINK) {
|
|
GstPad *peer = gst_pad_get_peer (pad);
|
|
|
|
if (peer) {
|
|
if (!gst_pad_activate_pull (peer, active)) {
|
|
GST_LOCK (peer);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
|
|
"activate_pull on peer (%s:%s) failed", GST_DEBUG_PAD_NAME (peer));
|
|
GST_UNLOCK (peer);
|
|
gst_object_unref (peer);
|
|
goto failure;
|
|
}
|
|
}
|
|
}
|
|
|
|
pre_activate_switch (pad, active);
|
|
|
|
if (GST_PAD_ACTIVATEPULLFUNC (pad)) {
|
|
if (GST_PAD_ACTIVATEPULLFUNC (pad) (pad, active)) {
|
|
goto success;
|
|
} else {
|
|
goto failure;
|
|
}
|
|
} else {
|
|
/* can happen for sinks of passthrough elements */
|
|
goto success;
|
|
}
|
|
|
|
was_ok:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in pull mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
|
|
success:
|
|
{
|
|
GST_LOCK (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) =
|
|
active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
|
|
GST_UNLOCK (pad);
|
|
post_activate_switch (pad, active);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in pull mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
|
|
failure:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in pull mode",
|
|
active ? "activate" : "deactivate");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_activate_push:
|
|
* @pad: the #GstPad to activate or deactivate.
|
|
* @active: whether or not the pad should be active.
|
|
*
|
|
* Activates or deactivates the given pad in push mode via dispatching to the
|
|
* pad's activatepushfunc. For use from within pad activation functions only.
|
|
*
|
|
* If you don't know what this is, you probably don't want to call it.
|
|
*
|
|
* Returns: TRUE if the operation was successfull.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
GstActivateMode old;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
old = GST_PAD_ACTIVATE_MODE (pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if ((active && old == GST_ACTIVATE_PUSH)
|
|
|| (!active && old == GST_ACTIVATE_NONE))
|
|
goto was_ok;
|
|
|
|
if (active) {
|
|
g_return_val_if_fail (old == GST_ACTIVATE_NONE, FALSE);
|
|
} else {
|
|
g_return_val_if_fail (old == GST_ACTIVATE_PUSH, FALSE);
|
|
}
|
|
|
|
pre_activate_switch (pad, active);
|
|
|
|
if (GST_PAD_ACTIVATEPUSHFUNC (pad)) {
|
|
if (GST_PAD_ACTIVATEPUSHFUNC (pad) (pad, active)) {
|
|
goto success;
|
|
} else {
|
|
goto failure;
|
|
}
|
|
} else {
|
|
/* quite ok, element relies on state change func to prepare itself */
|
|
goto success;
|
|
}
|
|
|
|
was_ok:
|
|
{
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "already %s in push mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
|
|
success:
|
|
{
|
|
GST_LOCK (pad);
|
|
GST_PAD_ACTIVATE_MODE (pad) =
|
|
active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
|
|
GST_UNLOCK (pad);
|
|
post_activate_switch (pad, active);
|
|
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "%s in push mode",
|
|
active ? "activated" : "deactivated");
|
|
return TRUE;
|
|
}
|
|
|
|
failure:
|
|
{
|
|
GST_CAT_INFO_OBJECT (GST_CAT_PADS, pad, "failed to %s in push mode",
|
|
active ? "activate" : "deactivate");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
result = GST_PAD_MODE_ACTIVATE (GST_PAD_ACTIVATE_MODE (pad));
|
|
GST_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_blocked_async:
|
|
* @pad: the #GstPad to block or unblock
|
|
* @blocked: boolean indicating we should block or unblock
|
|
* @callback: #GstPadBlockCallback that will be called when the
|
|
* operation succeeds.
|
|
* @user_data: user data passed to the callback
|
|
*
|
|
* Blocks or unblocks the dataflow on a pad. The provided callback
|
|
* is called when the operation succeeds. This can take a while as
|
|
* the pad can only become blocked when real dataflow is happening.
|
|
* When the pipeline is stalled, for example in PAUSED, this can
|
|
* take an indeterminate amount of time.
|
|
* You can pass NULL as the callback to make this call block. Be
|
|
* carefull with this blocking call as it might not return for
|
|
* reasons stated above.
|
|
*
|
|
* Returns: TRUE if the pad could be blocked. This function can fail
|
|
* if wrong parameters were passed or the pad was already in the
|
|
* requested state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_blocked_async (GstPad * pad, gboolean blocked,
|
|
GstPadBlockCallback callback, gpointer user_data)
|
|
{
|
|
gboolean was_blocked;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
was_blocked = GST_PAD_IS_BLOCKED (pad);
|
|
|
|
if (G_UNLIKELY (was_blocked == blocked))
|
|
goto had_right_state;
|
|
|
|
if (blocked) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "blocking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
GST_FLAG_SET (pad, GST_PAD_BLOCKED);
|
|
pad->block_callback = callback;
|
|
pad->block_data = user_data;
|
|
if (!callback) {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "waiting for block");
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "blocked");
|
|
}
|
|
} else {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "unblocking pad %s:%s",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
GST_FLAG_UNSET (pad, GST_PAD_BLOCKED);
|
|
|
|
pad->block_callback = callback;
|
|
pad->block_data = user_data;
|
|
|
|
if (callback) {
|
|
GST_PAD_BLOCK_SIGNAL (pad);
|
|
} else {
|
|
GST_PAD_BLOCK_SIGNAL (pad);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "waiting for unblock");
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "unblocked");
|
|
}
|
|
}
|
|
GST_UNLOCK (pad);
|
|
|
|
return TRUE;
|
|
|
|
had_right_state:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pad %s:%s was in right state", GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_blocked:
|
|
* @pad: the #GstPad to block or unblock
|
|
* @blocked: boolean indicating we should block or unblock
|
|
*
|
|
* Blocks or unblocks the dataflow on a pad. This function is
|
|
* a shortcut for @gst_pad_set_blocked_async() with a NULL
|
|
* callback.
|
|
*
|
|
* Returns: TRUE if the pad could be blocked. This function can fail
|
|
* wrong parameters were passed or the pad was already in the
|
|
* requested state.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_blocked (GstPad * pad, gboolean blocked)
|
|
{
|
|
return gst_pad_set_blocked_async (pad, blocked, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_pad_is_blocked:
|
|
* @pad: the #GstPad to query
|
|
*
|
|
* Checks if the pad is blocked or not. This function returns the
|
|
* last requested state of the pad. It is not certain that the pad
|
|
* is actually blocked at this point.
|
|
*
|
|
* Returns: TRUE if the pad is blocked.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_is_blocked (GstPad * pad)
|
|
{
|
|
gboolean result = FALSE;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), result);
|
|
|
|
GST_LOCK (pad);
|
|
result = GST_FLAG_IS_SET (pad, GST_PAD_BLOCKED);
|
|
GST_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activate_function:
|
|
* @pad: a sink #GstPad.
|
|
* @chain: the #GstPadActivateFunction to set.
|
|
*
|
|
* Sets the given activate function for the pad. The activate function will
|
|
* dispatch to activate_push or activate_pull to perform the actual activation.
|
|
* Only makes sense to set on sink pads.
|
|
*
|
|
* Call this function if your sink pad can start a pull-based task.
|
|
*/
|
|
void
|
|
gst_pad_set_activate_function (GstPad * pad, GstPadActivateFunction activate)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEFUNC (pad) = activate;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "activatefunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (activate));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activatepull_function:
|
|
* @pad: a sink #GstPad.
|
|
* @chain: the #GstPadActivateModeFunction to set.
|
|
*
|
|
* Sets the given activate_pull function for the pad. An activate_pull function
|
|
* prepares the element and any upstream connections for pulling. See XXX
|
|
* part-activation.txt for details.
|
|
*/
|
|
void
|
|
gst_pad_set_activatepull_function (GstPad * pad,
|
|
GstPadActivateModeFunction activatepull)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEPULLFUNC (pad) = activatepull;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "activatepullfunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (activatepull));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_activatepush_function:
|
|
* @pad: a sink #GstPad.
|
|
* @chain: the #GstPadActivateModeFunction to set.
|
|
*
|
|
* Sets the given activate_push function for the pad. An activate_push function
|
|
* prepares the element for pushing. See XXX part-activation.txt for details.
|
|
*/
|
|
void
|
|
gst_pad_set_activatepush_function (GstPad * pad,
|
|
GstPadActivateModeFunction activatepush)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACTIVATEPUSHFUNC (pad) = activatepush;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "activatepushfunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (activatepush));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_chain_function:
|
|
* @pad: a 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_PAD (pad));
|
|
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK);
|
|
|
|
GST_PAD_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_getrange_function:
|
|
* @pad: a source #GstPad.
|
|
* @get: the #GstPadGetRangeFunction to set.
|
|
*
|
|
* Sets the given getrange function for the pad. The getrange function is called to
|
|
* produce a new #GstBuffer to start the processing pipeline. Getrange functions cannot
|
|
* return %NULL.
|
|
*/
|
|
void
|
|
gst_pad_set_getrange_function (GstPad * pad, GstPadGetRangeFunction get)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
|
|
|
|
GST_PAD_GETRANGEFUNC (pad) = get;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "getrangefunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (get));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_checkgetrange_function:
|
|
* @pad: a source #GstPad.
|
|
* @check: the #GstPadCheckGetRangeFunction to set.
|
|
*
|
|
* Sets the given checkgetrange function for the pad. Implement this function on
|
|
* a pad if you dynamically support getrange based scheduling on the pad.
|
|
*/
|
|
void
|
|
gst_pad_set_checkgetrange_function (GstPad * pad,
|
|
GstPadCheckGetRangeFunction check)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC);
|
|
|
|
GST_PAD_CHECKGETRANGEFUNC (pad) = check;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "checkgetrangefunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (check));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_event_function:
|
|
* @pad: a 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_PAD (pad));
|
|
|
|
GST_PAD_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_query_function:
|
|
* @pad: a #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_PAD (pad));
|
|
|
|
GST_PAD_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 #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_PAD (pad));
|
|
|
|
GST_PAD_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)
|
|
{
|
|
GstPadQueryTypeFunction func;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (G_UNLIKELY ((func = GST_PAD_QUERYTYPEFUNC (pad)) == NULL))
|
|
goto no_func;
|
|
|
|
return func (pad);
|
|
|
|
no_func:
|
|
{
|
|
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 #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_PAD (pad));
|
|
|
|
GST_PAD_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_link_function:
|
|
* @pad: a #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 is
|
|
* the caps for the connnection. It can contain a non fixed caps.
|
|
*
|
|
* The return value GST_PAD_LINK_OK should be used when the connection can be
|
|
* made.
|
|
*
|
|
* The return value GST_PAD_LINK_REFUSED should be used when the connection
|
|
* cannot be made for some reason.
|
|
*/
|
|
void
|
|
gst_pad_set_link_function (GstPad * pad, GstPadLinkFunction link)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_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 #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_PAD (pad));
|
|
|
|
GST_PAD_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_getcaps_function:
|
|
* @pad: a #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, so the caller
|
|
* should unref the caps after usage.
|
|
*/
|
|
void
|
|
gst_pad_set_getcaps_function (GstPad * pad, GstPadGetCapsFunction getcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_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_acceptcaps_function:
|
|
* @pad: a #GstPad.
|
|
* @acceptcaps: the #GstPadAcceptCapsFunction to set.
|
|
*
|
|
* Sets the given acceptcaps function for the pad. The acceptcaps function
|
|
* will be called to check if the pad can accept the given caps.
|
|
*/
|
|
void
|
|
gst_pad_set_acceptcaps_function (GstPad * pad,
|
|
GstPadAcceptCapsFunction acceptcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_ACCEPTCAPSFUNC (pad) = acceptcaps;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "acceptcapsfunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (acceptcaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_fixatecaps_function:
|
|
* @pad: a #GstPad.
|
|
* @fixatecaps: the #GstPadFixateCapsFunction to set.
|
|
*
|
|
* Sets the given fixatecaps function for the pad. The fixatecaps function
|
|
* will be called whenever the default values for a GstCaps needs to be
|
|
* filled in.
|
|
*/
|
|
void
|
|
gst_pad_set_fixatecaps_function (GstPad * pad,
|
|
GstPadFixateCapsFunction fixatecaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_FIXATECAPSFUNC (pad) = fixatecaps;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "fixatecapsfunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (fixatecaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_setcaps_function:
|
|
* @pad: a #GstPad.
|
|
* @setcaps: the #GstPadSetCapsFunction to set.
|
|
*
|
|
* Sets the given setcaps function for the pad. The setcaps function
|
|
* will be called whenever a buffer with a new media type is pushed or
|
|
* pulled from the pad. The pad/element needs to update it's internal
|
|
* structures to process the new media type. If this new type is not
|
|
* acceptable, the setcaps function should return FALSE.
|
|
*/
|
|
void
|
|
gst_pad_set_setcaps_function (GstPad * pad, GstPadSetCapsFunction setcaps)
|
|
{
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
|
|
GST_PAD_SETCAPSFUNC (pad) = setcaps;
|
|
GST_CAT_DEBUG (GST_CAT_PADS, "setcapsfunc for %s:%s set to %s",
|
|
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_FUNCPTR_NAME (setcaps));
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_bufferalloc_function:
|
|
* @pad: a 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_PAD (pad));
|
|
g_return_if_fail (GST_PAD_IS_SINK (pad));
|
|
|
|
GST_PAD_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));
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns: TRUE if the pads were unlinked. This function returns FALSE if
|
|
* the pads were not linked together.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_unlink (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
|
|
|
|
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);
|
|
|
|
GST_LOCK (srcpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_DIRECTION (srcpad) != GST_PAD_SRC))
|
|
goto not_srcpad;
|
|
|
|
GST_LOCK (sinkpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_DIRECTION (sinkpad) != GST_PAD_SINK))
|
|
goto not_sinkpad;
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (srcpad) != sinkpad))
|
|
goto not_linked_together;
|
|
|
|
if (GST_PAD_UNLINKFUNC (srcpad)) {
|
|
GST_PAD_UNLINKFUNC (srcpad) (srcpad);
|
|
}
|
|
if (GST_PAD_UNLINKFUNC (sinkpad)) {
|
|
GST_PAD_UNLINKFUNC (sinkpad) (sinkpad);
|
|
}
|
|
|
|
/* first clear peers */
|
|
GST_PAD_PEER (srcpad) = NULL;
|
|
GST_PAD_PEER (sinkpad) = NULL;
|
|
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
|
|
/* fire off a signal to each of the pads telling them
|
|
* that they've been unlinked */
|
|
g_signal_emit (G_OBJECT (srcpad), gst_pad_signals[PAD_UNLINKED], 0, sinkpad);
|
|
g_signal_emit (G_OBJECT (sinkpad), gst_pad_signals[PAD_UNLINKED], 0, srcpad);
|
|
|
|
GST_CAT_INFO (GST_CAT_ELEMENT_PADS, "unlinked %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
return TRUE;
|
|
|
|
not_srcpad:
|
|
{
|
|
g_critical ("pad %s is not a source pad", GST_PAD_NAME (srcpad));
|
|
GST_UNLOCK (srcpad);
|
|
return FALSE;
|
|
}
|
|
not_sinkpad:
|
|
{
|
|
g_critical ("pad %s is not a sink pad", GST_PAD_NAME (sinkpad));
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
return FALSE;
|
|
}
|
|
not_linked_together:
|
|
{
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
result = (GST_PAD_PEER (pad) != NULL);
|
|
GST_UNLOCK (pad);
|
|
|
|
return result;
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_link_check_compatible_unlocked (GstPad * src, GstPad * sink)
|
|
{
|
|
GstCaps *srccaps;
|
|
GstCaps *sinkcaps;
|
|
|
|
srccaps = gst_pad_get_caps_unlocked (src);
|
|
sinkcaps = gst_pad_get_caps_unlocked (sink);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, " src caps %" GST_PTR_FORMAT, srccaps);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "sink caps %" GST_PTR_FORMAT, sinkcaps);
|
|
|
|
if (srccaps && sinkcaps) {
|
|
GstCaps *icaps;
|
|
|
|
icaps = gst_caps_intersect (srccaps, sinkcaps);
|
|
gst_caps_unref (srccaps);
|
|
gst_caps_unref (sinkcaps);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"intersection caps %p %" GST_PTR_FORMAT, icaps, icaps);
|
|
|
|
if (!icaps || gst_caps_is_empty (icaps)) {
|
|
gst_caps_unref (icaps);
|
|
return FALSE;
|
|
}
|
|
gst_caps_unref (icaps);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/* FIXME leftover from an attempt at refactoring... */
|
|
/* call with the two pads unlocked */
|
|
static GstPadLinkReturn
|
|
gst_pad_link_prepare (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
/* generic checks */
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), GST_PAD_LINK_REFUSED);
|
|
g_return_val_if_fail (GST_IS_PAD (sinkpad), GST_PAD_LINK_REFUSED);
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
GST_LOCK (srcpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_DIRECTION (srcpad) != GST_PAD_SRC))
|
|
goto not_srcpad;
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (srcpad) != NULL))
|
|
goto src_was_linked;
|
|
|
|
GST_LOCK (sinkpad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_DIRECTION (sinkpad) != GST_PAD_SINK))
|
|
goto not_sinkpad;
|
|
|
|
if (G_UNLIKELY (GST_PAD_PEER (sinkpad) != NULL))
|
|
goto sink_was_linked;
|
|
|
|
/* check pad caps for non-empty intersection */
|
|
if (!gst_pad_link_check_compatible_unlocked (srcpad, sinkpad)) {
|
|
goto no_format;
|
|
}
|
|
|
|
/* FIXME check pad scheduling for non-empty intersection */
|
|
|
|
return GST_PAD_LINK_OK;
|
|
|
|
not_srcpad:
|
|
{
|
|
g_critical ("pad %s is not a source pad", GST_PAD_NAME (srcpad));
|
|
GST_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WRONG_DIRECTION;
|
|
}
|
|
src_was_linked:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "src %s:%s was linked",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WAS_LINKED;
|
|
}
|
|
not_sinkpad:
|
|
{
|
|
g_critical ("pad %s is not a sink pad", GST_PAD_NAME (sinkpad));
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WRONG_DIRECTION;
|
|
}
|
|
sink_was_linked:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "sink %s:%s was linked",
|
|
GST_DEBUG_PAD_NAME (sinkpad));
|
|
/* we do not emit a warning in this case because unlinking cannot
|
|
* be made MT safe.*/
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_WAS_LINKED;
|
|
}
|
|
no_format:
|
|
{
|
|
GST_CAT_INFO (GST_CAT_PADS, "caps are incompatible");
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
return GST_PAD_LINK_NOFORMAT;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_link:
|
|
* @srcpad: the source #GstPad to link.
|
|
* @sinkpad: the sink #GstPad to link.
|
|
*
|
|
* Links the source pad and the sink pad.
|
|
*
|
|
* Returns: A result code indicating if the connection worked or
|
|
* what went wrong.
|
|
*
|
|
* MT Safe.
|
|
*/
|
|
GstPadLinkReturn
|
|
gst_pad_link (GstPad * srcpad, GstPad * sinkpad)
|
|
{
|
|
GstPadLinkReturn result;
|
|
|
|
/* prepare will also lock the two pads */
|
|
result = gst_pad_link_prepare (srcpad, sinkpad);
|
|
|
|
if (result != GST_PAD_LINK_OK)
|
|
goto prepare_failed;
|
|
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
|
|
/* FIXME released the locks here, concurrent thread might link
|
|
* something else. */
|
|
if (GST_PAD_LINKFUNC (srcpad)) {
|
|
/* this one will call the peer link function */
|
|
result = GST_PAD_LINKFUNC (srcpad) (srcpad, sinkpad);
|
|
} else if (GST_PAD_LINKFUNC (sinkpad)) {
|
|
/* if no source link function, we need to call the sink link
|
|
* function ourselves. */
|
|
result = GST_PAD_LINKFUNC (sinkpad) (sinkpad, srcpad);
|
|
} else {
|
|
result = GST_PAD_LINK_OK;
|
|
}
|
|
|
|
GST_LOCK (srcpad);
|
|
GST_LOCK (sinkpad);
|
|
|
|
if (result == GST_PAD_LINK_OK) {
|
|
GST_PAD_PEER (srcpad) = sinkpad;
|
|
GST_PAD_PEER (sinkpad) = srcpad;
|
|
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
|
|
/* fire off a signal to each of the pads telling them
|
|
* that they've been linked */
|
|
g_signal_emit (G_OBJECT (srcpad), gst_pad_signals[PAD_LINKED], 0, sinkpad);
|
|
g_signal_emit (G_OBJECT (sinkpad), gst_pad_signals[PAD_LINKED], 0, srcpad);
|
|
|
|
GST_CAT_INFO (GST_CAT_PADS, "linked %s:%s and %s:%s, successful",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
} else {
|
|
GST_CAT_INFO (GST_CAT_PADS, "link between %s:%s and %s:%s failed",
|
|
GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
|
|
|
|
GST_UNLOCK (sinkpad);
|
|
GST_UNLOCK (srcpad);
|
|
}
|
|
return result;
|
|
|
|
prepare_failed:
|
|
{
|
|
return result;
|
|
}
|
|
}
|
|
|
|
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.
|
|
*
|
|
* FIXME: currently returns an unrefcounted padtemplate.
|
|
*/
|
|
GstPadTemplate *
|
|
gst_pad_get_pad_template (GstPad * pad)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
return GST_PAD_PAD_TEMPLATE (pad);
|
|
}
|
|
|
|
|
|
/* should be called with the pad LOCK held */
|
|
/* refs the caps, so caller is responsible for getting it unreffed */
|
|
static GstCaps *
|
|
gst_pad_get_caps_unlocked (GstPad * pad)
|
|
{
|
|
GstCaps *result = NULL;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
|
|
GST_DEBUG_PAD_NAME (pad), pad);
|
|
|
|
if (GST_PAD_GETCAPSFUNC (pad)) {
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "dispatching to pad getcaps function");
|
|
|
|
GST_FLAG_SET (pad, GST_PAD_IN_GETCAPS);
|
|
GST_UNLOCK (pad);
|
|
result = GST_PAD_GETCAPSFUNC (pad) (pad);
|
|
GST_LOCK (pad);
|
|
GST_FLAG_UNSET (pad, GST_PAD_IN_GETCAPS);
|
|
|
|
if (result == NULL) {
|
|
g_critical ("pad %s:%s returned NULL caps from getcaps function",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
} else {
|
|
#ifndef G_DISABLE_ASSERT
|
|
/* check that the returned caps are a real subset of the template caps */
|
|
if (GST_PAD_PAD_TEMPLATE (pad)) {
|
|
const GstCaps *templ_caps =
|
|
GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad));
|
|
if (!gst_caps_is_subset (result, 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, result, templ_caps);
|
|
g_warning
|
|
("pad %s:%s returned caps that are not a real subset of its template caps",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
temp = gst_caps_intersect (templ_caps, result);
|
|
gst_caps_unref (result);
|
|
result = temp;
|
|
}
|
|
}
|
|
#endif
|
|
goto done;
|
|
}
|
|
}
|
|
if (GST_PAD_PAD_TEMPLATE (pad)) {
|
|
GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (pad);
|
|
|
|
result = GST_PAD_TEMPLATE_CAPS (templ);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result,
|
|
result);
|
|
|
|
result = gst_caps_ref (result);
|
|
goto done;
|
|
}
|
|
if (GST_PAD_CAPS (pad)) {
|
|
result = GST_PAD_CAPS (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"using pad caps %p %" GST_PTR_FORMAT, result, result);
|
|
|
|
result = gst_caps_ref (result);
|
|
goto done;
|
|
}
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
|
|
result = gst_caps_new_empty ();
|
|
|
|
done:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_caps (GstPad * pad)
|
|
{
|
|
GstCaps *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "get pad caps of %s:%s (%p)",
|
|
GST_DEBUG_PAD_NAME (pad), pad);
|
|
|
|
if (G_UNLIKELY (GST_PAD_IS_IN_GETCAPS (pad)))
|
|
goto was_dispatching;
|
|
|
|
result = gst_pad_get_caps_unlocked (pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
return result;
|
|
|
|
was_dispatching:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"pad %s:%s is already dispatching!", GST_DEBUG_PAD_NAME (pad));
|
|
g_warning ("pad %s:%s recursively called getcaps!",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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. this function returns NULL if there is no
|
|
* peer pad or when this function is called recursively from a getcaps function.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_peer_get_caps (GstPad * pad)
|
|
{
|
|
GstPad *peerpad;
|
|
GstCaps *result = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "get peer caps of %s:%s (%p)",
|
|
GST_DEBUG_PAD_NAME (pad), pad);
|
|
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peerpad == NULL))
|
|
goto no_peer;
|
|
|
|
if (G_UNLIKELY (GST_PAD_IS_IN_GETCAPS (peerpad)))
|
|
goto was_dispatching;
|
|
|
|
gst_object_ref (peerpad);
|
|
GST_UNLOCK (pad);
|
|
|
|
result = gst_pad_get_caps (peerpad);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
no_peer:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
return NULL;
|
|
}
|
|
was_dispatching:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"pad %s:%s is already dispatching!", GST_DEBUG_PAD_NAME (pad));
|
|
g_warning ("pad %s:%s recursively called getcaps!",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_fixate_caps:
|
|
* @pad: a #GstPad to fixate
|
|
* @caps: the #GstCaps to fixate
|
|
*
|
|
* Fixate a caps on the given pad. Modifies the caps in place, so you should be
|
|
* that the caps are actually writable (see gst_caps_make_writable()).
|
|
*/
|
|
void
|
|
gst_pad_fixate_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadFixateCapsFunction fixatefunc;
|
|
|
|
g_return_if_fail (GST_IS_PAD (pad));
|
|
g_return_if_fail (caps != NULL);
|
|
|
|
fixatefunc = GST_PAD_FIXATECAPSFUNC (pad);
|
|
if (fixatefunc) {
|
|
fixatefunc (pad, caps);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_accept_caps:
|
|
* @pad: a #GstPad to check
|
|
*
|
|
* Check if the given pad accepts the caps.
|
|
*
|
|
* Returns: TRUE if the pad can accept the caps.
|
|
*/
|
|
gboolean
|
|
gst_pad_accept_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
gboolean result;
|
|
GstPadAcceptCapsFunction acceptfunc;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
/* any pad can be unnegotiated */
|
|
if (caps == NULL)
|
|
return TRUE;
|
|
|
|
GST_LOCK (pad);
|
|
acceptfunc = GST_PAD_ACCEPTCAPSFUNC (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "pad accept caps of %s:%s (%p)",
|
|
GST_DEBUG_PAD_NAME (pad), pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (acceptfunc) {
|
|
/* we can call the function */
|
|
result = acceptfunc (pad, caps);
|
|
} else {
|
|
/* else see get the caps and see if it intersects to something
|
|
* not empty */
|
|
GstCaps *intersect;
|
|
GstCaps *allowed;
|
|
|
|
allowed = gst_pad_get_caps (pad);
|
|
if (allowed) {
|
|
intersect = gst_caps_intersect (allowed, caps);
|
|
|
|
result = !gst_caps_is_empty (intersect);
|
|
|
|
gst_caps_unref (allowed);
|
|
gst_caps_unref (intersect);
|
|
} else {
|
|
result = FALSE;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_peer_accept_caps:
|
|
* @pad: a #GstPad to check
|
|
*
|
|
* Check if the given pad accepts the caps.
|
|
*
|
|
* Returns: TRUE if the pad can accept the caps.
|
|
*/
|
|
gboolean
|
|
gst_pad_peer_accept_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPad *peerpad;
|
|
gboolean result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "peer accept caps of %s:%s (%p)",
|
|
GST_DEBUG_PAD_NAME (pad), pad);
|
|
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (G_UNLIKELY (peerpad == NULL))
|
|
goto no_peer;
|
|
|
|
result = gst_pad_accept_caps (peerpad, caps);
|
|
GST_UNLOCK (pad);
|
|
|
|
return result;
|
|
|
|
no_peer:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_set_caps:
|
|
* @pad: a #GstPad to set the capabilities of.
|
|
* @caps: a #GstCaps to set.
|
|
*
|
|
* Sets the capabilities of this pad. The caps must be fixed. Any previous
|
|
* caps on the pad will be unreffed. This function refs the caps so you should
|
|
* unref if as soon as you don't need it anymore.
|
|
* It is possible to set NULL caps, which will make the pad unnegotiated
|
|
* again.
|
|
*
|
|
* Returns: TRUE if the caps could be set. FALSE if the caps were not fixed
|
|
* or bad parameters were provided to this function.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_set_caps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadSetCapsFunction setcaps;
|
|
GstCaps *existing;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (caps == NULL || gst_caps_is_fixed (caps), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
setcaps = GST_PAD_SETCAPSFUNC (pad);
|
|
|
|
existing = GST_PAD_CAPS (pad);
|
|
if (caps == existing)
|
|
goto setting_same_caps;
|
|
else if (caps && existing && gst_caps_is_equal (caps, existing))
|
|
goto setting_same_caps;
|
|
|
|
/* call setcaps function to configure the pad */
|
|
if (setcaps != NULL && caps) {
|
|
if (!GST_PAD_IS_IN_SETCAPS (pad)) {
|
|
GST_FLAG_SET (pad, GST_PAD_IN_SETCAPS);
|
|
GST_UNLOCK (pad);
|
|
if (!setcaps (pad, caps))
|
|
goto could_not_set;
|
|
GST_LOCK (pad);
|
|
GST_FLAG_UNSET (pad, GST_PAD_IN_SETCAPS);
|
|
} else {
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "pad %s:%s was dispatching",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
}
|
|
}
|
|
|
|
gst_caps_replace (&GST_PAD_CAPS (pad), caps);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "%s:%s caps %" GST_PTR_FORMAT,
|
|
GST_DEBUG_PAD_NAME (pad), caps);
|
|
GST_UNLOCK (pad);
|
|
|
|
g_object_notify (G_OBJECT (pad), "caps");
|
|
|
|
return TRUE;
|
|
|
|
setting_same_caps:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
gst_caps_replace (&GST_PAD_CAPS (pad), caps);
|
|
GST_CAT_DEBUG_OBJECT (GST_CAT_CAPS, pad,
|
|
"caps %" GST_PTR_FORMAT " same as existing, updating ptr only", caps);
|
|
return TRUE;
|
|
}
|
|
/* errors */
|
|
could_not_set:
|
|
{
|
|
GST_LOCK (pad);
|
|
GST_FLAG_UNSET (pad, GST_PAD_IN_SETCAPS);
|
|
GST_CAT_DEBUG (GST_CAT_CAPS,
|
|
"pad %s:%s, caps %" GST_PTR_FORMAT " could not be set",
|
|
GST_DEBUG_PAD_NAME (pad), caps);
|
|
GST_UNLOCK (pad);
|
|
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_configure_sink (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadAcceptCapsFunction acceptcaps;
|
|
GstPadSetCapsFunction setcaps;
|
|
gboolean res;
|
|
|
|
acceptcaps = GST_PAD_ACCEPTCAPSFUNC (pad);
|
|
setcaps = GST_PAD_SETCAPSFUNC (pad);
|
|
|
|
/* See if pad accepts the caps, by calling acceptcaps, only
|
|
* needed if no setcaps function */
|
|
if (setcaps == NULL && acceptcaps != NULL) {
|
|
if (!acceptcaps (pad, caps))
|
|
goto not_accepted;
|
|
}
|
|
/* set caps on pad if call succeeds */
|
|
res = gst_pad_set_caps (pad, caps);
|
|
/* no need to unref the caps here, set_caps takes a ref and
|
|
* our ref goes away when we leave this function. */
|
|
|
|
return res;
|
|
|
|
not_accepted:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "caps %" GST_PTR_FORMAT " not accepted", caps);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_pad_configure_src (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstPadAcceptCapsFunction acceptcaps;
|
|
GstPadSetCapsFunction setcaps;
|
|
gboolean res;
|
|
|
|
acceptcaps = GST_PAD_ACCEPTCAPSFUNC (pad);
|
|
setcaps = GST_PAD_SETCAPSFUNC (pad);
|
|
|
|
/* See if pad accepts the caps, by calling acceptcaps, only
|
|
* needed if no setcaps function */
|
|
if (setcaps == NULL && acceptcaps != NULL) {
|
|
if (!acceptcaps (pad, caps))
|
|
goto not_accepted;
|
|
}
|
|
/* set caps on pad if call succeeds */
|
|
res = gst_pad_set_caps (pad, caps);
|
|
/* no need to unref the caps here, set_caps takes a ref and
|
|
* our ref goes away when we leave this function. */
|
|
|
|
return res;
|
|
|
|
not_accepted:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "caps %" GST_PTR_FORMAT " not accepted", caps);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
GstPad *result;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_LOCK (pad);
|
|
result = GST_PAD_PEER (pad);
|
|
if (result)
|
|
gst_object_ref (result);
|
|
GST_UNLOCK (pad);
|
|
|
|
return 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
|
|
* @srcpad 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 @srcpad has no
|
|
* peer.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_allowed_caps (GstPad * srcpad)
|
|
{
|
|
GstCaps *mycaps;
|
|
GstCaps *caps;
|
|
GstCaps *peercaps;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (srcpad), NULL);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (srcpad), NULL);
|
|
|
|
GST_LOCK (srcpad);
|
|
|
|
peer = GST_PAD_PEER (srcpad);
|
|
if (G_UNLIKELY (peer == NULL))
|
|
goto no_peer;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting allowed caps",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
|
|
gst_object_ref (peer);
|
|
GST_UNLOCK (srcpad);
|
|
mycaps = gst_pad_get_caps (srcpad);
|
|
|
|
peercaps = gst_pad_get_caps (peer);
|
|
gst_object_unref (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;
|
|
|
|
no_peer:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer",
|
|
GST_DEBUG_PAD_NAME (srcpad));
|
|
GST_UNLOCK (srcpad);
|
|
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_negotiated_caps:
|
|
* @pad: a #GstPad.
|
|
*
|
|
* Gets the capabilities of the media type that currently flows through @pad
|
|
* and its peer.
|
|
*
|
|
* This function can be used on both src and sinkpads. Note that srcpads are
|
|
* always negotiated before sinkpads so it is possible that the negotiated caps
|
|
* on the srcpad do not match the negotiated caps of the peer.
|
|
*
|
|
* Returns: the negotiated #GstCaps of the pad link. Free the caps when
|
|
* you no longer need it. This function returns NULL when the @pad has no
|
|
* peer or is not negotiated yet.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstCaps *
|
|
gst_pad_get_negotiated_caps (GstPad * pad)
|
|
{
|
|
GstCaps *caps;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto no_peer;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: getting negotiated caps",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
|
|
caps = GST_PAD_CAPS (pad);
|
|
if (caps)
|
|
gst_caps_ref (caps);
|
|
GST_UNLOCK (pad);
|
|
|
|
GST_CAT_DEBUG (GST_CAT_CAPS, "negotiated caps %" GST_PTR_FORMAT, caps);
|
|
|
|
return caps;
|
|
|
|
no_peer:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_PROPERTIES, "%s:%s: no peer",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @caps: the caps of the new buffer
|
|
* @buf: a newly allocated buffer
|
|
*
|
|
* Allocates a new, empty buffer optimized to push to pad @pad. This
|
|
* function only works if @pad is a source pad and has a peer.
|
|
*
|
|
* You need to check the caps of the buffer after performing this
|
|
* function and renegotiate to the format if needed.
|
|
*
|
|
* A new, empty #GstBuffer will be put in the @buf argument.
|
|
*
|
|
* Returns: a result code indicating success of the operation. Any
|
|
* result code other than GST_FLOW_OK is an error and @buf should
|
|
* not be used.
|
|
* An error can occur if the pad is not connected or when the downstream
|
|
* peer elements cannot provide an acceptable buffer.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_alloc_buffer (GstPad * pad, guint64 offset, gint size, GstCaps * caps,
|
|
GstBuffer ** buf)
|
|
{
|
|
GstPad *peer;
|
|
GstFlowReturn ret;
|
|
GstPadBufferAllocFunction bufferallocfunc;
|
|
gboolean caps_changed;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_IS_SRC (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR);
|
|
|
|
GST_LOCK (pad);
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto no_peer;
|
|
|
|
gst_object_ref (peer);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (G_LIKELY ((bufferallocfunc = peer->bufferallocfunc) == NULL))
|
|
goto fallback;
|
|
|
|
GST_LOCK (peer);
|
|
/* when the peer is flushing we cannot give a buffer */
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (peer)))
|
|
goto flushing;
|
|
|
|
GST_CAT_DEBUG (GST_CAT_PADS,
|
|
"calling bufferallocfunc &%s (@%p) of peer pad %s:%s",
|
|
GST_DEBUG_FUNCPTR_NAME (bufferallocfunc),
|
|
&bufferallocfunc, GST_DEBUG_PAD_NAME (peer));
|
|
GST_UNLOCK (peer);
|
|
|
|
ret = bufferallocfunc (peer, offset, size, caps, buf);
|
|
|
|
if (G_UNLIKELY (ret != GST_FLOW_OK))
|
|
goto peer_error;
|
|
if (G_UNLIKELY (*buf == NULL))
|
|
goto fallback;
|
|
|
|
do_caps:
|
|
gst_object_unref (peer);
|
|
|
|
/* FIXME, move capnego this into a base class? */
|
|
caps = GST_BUFFER_CAPS (*buf);
|
|
caps_changed = caps && caps != GST_PAD_CAPS (pad);
|
|
/* we got a new datatype on the pad, see if it can handle it */
|
|
if (G_UNLIKELY (caps_changed)) {
|
|
GST_DEBUG ("caps changed to %" GST_PTR_FORMAT, caps);
|
|
if (G_UNLIKELY (!gst_pad_configure_src (pad, caps)))
|
|
goto not_negotiated;
|
|
}
|
|
return ret;
|
|
|
|
no_peer:
|
|
{
|
|
/* pad has no peer */
|
|
GST_CAT_DEBUG (GST_CAT_PADS,
|
|
"%s:%s called bufferallocfunc but had no peer",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
return GST_FLOW_NOT_LINKED;
|
|
}
|
|
flushing:
|
|
{
|
|
/* peer was flushing */
|
|
GST_UNLOCK (peer);
|
|
gst_object_unref (peer);
|
|
GST_CAT_DEBUG (GST_CAT_PADS,
|
|
"%s:%s called bufferallocfunc but peer was flushing",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
return GST_FLOW_WRONG_STATE;
|
|
}
|
|
/* fallback case, allocate a buffer of our own, add pad caps. */
|
|
fallback:
|
|
{
|
|
GST_CAT_DEBUG (GST_CAT_PADS,
|
|
"%s:%s fallback buffer alloc", GST_DEBUG_PAD_NAME (pad));
|
|
*buf = gst_buffer_new_and_alloc (size);
|
|
gst_buffer_set_caps (*buf, caps);
|
|
|
|
ret = GST_FLOW_OK;
|
|
|
|
goto do_caps;
|
|
}
|
|
not_negotiated:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"alloc function retured unacceptable buffer");
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
peer_error:
|
|
{
|
|
gst_object_unref (peer);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"alloc function retured error %d", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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, or NULL if the pad has no parent.
|
|
*
|
|
* Not MT safe.
|
|
*/
|
|
GList *
|
|
gst_pad_get_internal_links_default (GstPad * pad)
|
|
{
|
|
GList *res = NULL;
|
|
GstElement *parent;
|
|
GList *parent_pads;
|
|
GstPadDirection direction;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
direction = pad->direction;
|
|
|
|
parent = GST_PAD_PARENT (pad);
|
|
if (!parent)
|
|
return NULL;
|
|
|
|
parent_pads = parent->pads;
|
|
|
|
while (parent_pads) {
|
|
GstPad *parent_pad = GST_PAD_CAST (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.
|
|
*
|
|
* Not MT safe.
|
|
*/
|
|
GList *
|
|
gst_pad_get_internal_links (GstPad * pad)
|
|
{
|
|
GList *res = NULL;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
|
|
|
|
if (GST_PAD_INTLINKFUNC (pad))
|
|
res = GST_PAD_INTLINKFUNC (pad) (pad);
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
gst_pad_event_default_dispatch (GstPad * pad, GstEvent * event)
|
|
{
|
|
GList *orig, *pads;
|
|
gboolean result;
|
|
|
|
GST_INFO_OBJECT (pad, "Sending event %p to all internally linked pads",
|
|
event);
|
|
|
|
result = (GST_PAD_DIRECTION (pad) == GST_PAD_SINK);
|
|
|
|
orig = pads = gst_pad_get_internal_links (pad);
|
|
|
|
while (pads) {
|
|
GstPad *eventpad = GST_PAD_CAST (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_event (eventpad, event);
|
|
} else {
|
|
/* we only send the event on one pad, multi-sinkpad elements
|
|
* should implement a handler */
|
|
GST_LOG_OBJECT (pad, "sending event %p to one sink pad %s:%s", event,
|
|
GST_DEBUG_PAD_NAME (eventpad));
|
|
result = gst_pad_push_event (eventpad, event);
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
/* we handled the incoming event so we unref once */
|
|
GST_LOG_OBJECT (pad, "handled event %p, unreffing", event);
|
|
gst_event_unref (event);
|
|
|
|
done:
|
|
g_list_free (orig);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_EOS:
|
|
{
|
|
GST_DEBUG_OBJECT (pad, "pausing task because of eos");
|
|
gst_pad_pause_task (pad);
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return gst_pad_event_default_dispatch (pad, event);
|
|
}
|
|
|
|
/**
|
|
* 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) {
|
|
GstPad *int_pad = GST_PAD_CAST (int_pads->data);
|
|
GstPad *int_peer = GST_PAD_PEER (int_pad);
|
|
|
|
if (int_peer) {
|
|
res = dispatch (int_peer, data);
|
|
if (res)
|
|
break;
|
|
}
|
|
int_pads = g_list_next (int_pads);
|
|
}
|
|
|
|
g_list_free (orig);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_query:
|
|
* @pad: a #GstPad to invoke the default query on.
|
|
* @query: the #GstQuery to perform.
|
|
*
|
|
* Dispatches a query to a pad. The query should have been allocated by the
|
|
* caller via one of the type-specific allocation functions in gstquery.h. The
|
|
* element is responsible for filling the query with an appropriate response,
|
|
* which should then be parsed with a type-specific query parsing function.
|
|
*
|
|
* Again, the caller is responsible for both the allocation and deallocation of
|
|
* the query structure.
|
|
*
|
|
* Returns: TRUE if the query could be performed.
|
|
*/
|
|
gboolean
|
|
gst_pad_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
GstPadQueryFunction func;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (GST_IS_QUERY (query), FALSE);
|
|
|
|
GST_DEBUG ("sending query %p to pad %s:%s", query, GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if ((func = GST_PAD_QUERYFUNC (pad)) == NULL)
|
|
goto no_func;
|
|
|
|
return func (pad, query);
|
|
|
|
no_func:
|
|
{
|
|
GST_DEBUG ("pad had no query function");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
gboolean
|
|
gst_pad_query_default (GstPad * pad, GstQuery * query)
|
|
{
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_POSITION:
|
|
case GST_QUERY_SEEKING:
|
|
case GST_QUERY_FORMATS:
|
|
case GST_QUERY_LATENCY:
|
|
case GST_QUERY_JITTER:
|
|
case GST_QUERY_RATE:
|
|
case GST_QUERY_CONVERT:
|
|
default:
|
|
return gst_pad_dispatcher
|
|
(pad, (GstPadDispatcherFunction) gst_pad_query, query);
|
|
}
|
|
}
|
|
|
|
#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 ((char *) field->name, "name")) {
|
|
name = (gchar *) xmlNodeGetContent (field);
|
|
pad = gst_element_get_pad (GST_ELEMENT (parent), name);
|
|
g_free (name);
|
|
} else if (!strcmp ((char *) field->name, "peer")) {
|
|
peer = (gchar *) 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)
|
|
{
|
|
GstPad *pad;
|
|
GstPad *peer;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (object), NULL);
|
|
|
|
pad = GST_PAD (object);
|
|
|
|
xmlNewChild (parent, NULL, (xmlChar *) "name",
|
|
(xmlChar *) GST_PAD_NAME (pad));
|
|
if (GST_PAD_PEER (pad) != NULL) {
|
|
gchar *content;
|
|
|
|
peer = GST_PAD_PEER (pad);
|
|
/* 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, (xmlChar *) "peer", (xmlChar *) content);
|
|
g_free (content);
|
|
} else
|
|
xmlNewChild (parent, NULL, (xmlChar *) "peer", NULL);
|
|
|
|
return parent;
|
|
}
|
|
|
|
#if 0
|
|
/**
|
|
* 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, (xmlChar *) "ghostpad", NULL);
|
|
xmlNewChild (self, NULL, (xmlChar *) "name", (xmlChar *) GST_PAD_NAME (pad));
|
|
xmlNewChild (self, NULL, (xmlChar *) "parent",
|
|
(xmlChar *) GST_OBJECT_NAME (GST_PAD_PARENT (pad)));
|
|
|
|
/* FIXME FIXME FIXME! */
|
|
|
|
return self;
|
|
}
|
|
#endif /* 0 */
|
|
#endif /* GST_DISABLE_LOADSAVE */
|
|
|
|
/*
|
|
* should be called with pad lock held
|
|
*
|
|
* MT safe.
|
|
*/
|
|
static void
|
|
handle_pad_block (GstPad * pad)
|
|
{
|
|
GstPadBlockCallback callback;
|
|
gpointer user_data;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"signal block taken on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
|
|
|
/* need to grab extra ref for the callbacks */
|
|
gst_object_ref (pad);
|
|
|
|
callback = pad->block_callback;
|
|
if (callback) {
|
|
user_data = pad->block_data;
|
|
GST_UNLOCK (pad);
|
|
callback (pad, TRUE, user_data);
|
|
GST_LOCK (pad);
|
|
} else {
|
|
GST_PAD_BLOCK_SIGNAL (pad);
|
|
}
|
|
|
|
while (GST_PAD_IS_BLOCKED (pad))
|
|
GST_PAD_BLOCK_WAIT (pad);
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad, "got unblocked");
|
|
|
|
callback = pad->block_callback;
|
|
if (callback) {
|
|
user_data = pad->block_data;
|
|
GST_UNLOCK (pad);
|
|
callback (pad, FALSE, user_data);
|
|
GST_LOCK (pad);
|
|
} else {
|
|
GST_PAD_BLOCK_SIGNAL (pad);
|
|
}
|
|
|
|
gst_object_unref (pad);
|
|
}
|
|
|
|
/**********************************************************************
|
|
* Data passing functions
|
|
*/
|
|
|
|
static gboolean
|
|
gst_pad_emit_have_data_signal (GstPad * pad, GstMiniObject * obj)
|
|
{
|
|
GValue ret = { 0 };
|
|
GValue args[2] = { {0}, {0} };
|
|
gboolean res;
|
|
|
|
/* init */
|
|
g_value_init (&ret, G_TYPE_BOOLEAN);
|
|
g_value_set_boolean (&ret, TRUE);
|
|
g_value_init (&args[0], GST_TYPE_PAD);
|
|
g_value_set_object (&args[0], pad);
|
|
g_value_init (&args[1], GST_TYPE_MINI_OBJECT); // G_TYPE_POINTER);
|
|
gst_value_set_mini_object (&args[1], obj);
|
|
|
|
/* actually emit */
|
|
g_signal_emitv (args, gst_pad_signals[PAD_HAVE_DATA], 0, &ret);
|
|
res = g_value_get_boolean (&ret);
|
|
|
|
/* clean up */
|
|
g_value_unset (&ret);
|
|
g_value_unset (&args[0]);
|
|
g_value_unset (&args[1]);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_chain:
|
|
* @pad: a sink #GstPad.
|
|
* @buffer: the #GstBuffer to send.
|
|
*
|
|
* Chain a buffer to @pad.
|
|
*
|
|
* Returns: a #GstFlowReturn from the pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_chain (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GstCaps *caps;
|
|
gboolean caps_changed;
|
|
GstPadChainFunction chainfunc;
|
|
GstFlowReturn ret;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK,
|
|
GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
|
|
GST_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
|
|
caps = GST_BUFFER_CAPS (buffer);
|
|
caps_changed = caps && caps != GST_PAD_CAPS (pad);
|
|
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
GST_UNLOCK (pad);
|
|
|
|
/* see if the signal should be emited, we emit before caps nego as
|
|
* we might drop the buffer and do capsnego for nothing. */
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (buffer)))
|
|
goto dropping;
|
|
}
|
|
|
|
/* we got a new datatype on the pad, see if it can handle it */
|
|
if (G_UNLIKELY (caps_changed)) {
|
|
GST_DEBUG ("caps changed to %" GST_PTR_FORMAT, caps);
|
|
if (G_UNLIKELY (!gst_pad_configure_sink (pad, caps)))
|
|
goto not_negotiated;
|
|
}
|
|
|
|
/* NOTE: we read the chainfunc unlocked.
|
|
* we cannot hold the lock for the pad so we might send
|
|
* the data to the wrong function. This is not really a
|
|
* problem since functions are assigned at creation time
|
|
* and don't change that often... */
|
|
if (G_UNLIKELY ((chainfunc = GST_PAD_CHAINFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling chainfunction &%s of pad %s:%s",
|
|
GST_DEBUG_FUNCPTR_NAME (chainfunc), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
ret = chainfunc (pad, buffer);
|
|
|
|
GST_STREAM_UNLOCK (pad);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
flushing:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but pad was flushing");
|
|
GST_UNLOCK (pad);
|
|
GST_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
dropping:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
GST_DEBUG ("Dropping buffer due to FALSE probe return");
|
|
GST_STREAM_UNLOCK (pad);
|
|
/* FIXME, failure? */
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
not_negotiated:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing buffer but pad did not accept");
|
|
GST_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_NOT_NEGOTIATED;
|
|
}
|
|
no_function:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but not chainhandler");
|
|
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
|
|
("push on pad %s:%s but it has no chainfunction",
|
|
GST_DEBUG_PAD_NAME (pad)));
|
|
GST_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_push:
|
|
* @pad: a source #GstPad.
|
|
* @buffer: the #GstBuffer to push.
|
|
*
|
|
* Pushes a buffer to the peer of @pad. @pad must be linked.
|
|
*
|
|
* Returns: a #GstFlowReturn from the peer pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_push (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GstPad *peer;
|
|
GstFlowReturn ret;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC, GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR);
|
|
|
|
GST_LOCK (pad);
|
|
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad)))
|
|
handle_pad_block (pad);
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto not_linked;
|
|
|
|
/* we emit signals on the pad areg, the peer will have a chance to
|
|
* emit in the _chain() function */
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
|
|
gst_object_ref (peer);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (buffer)))
|
|
goto dropping;
|
|
}
|
|
|
|
ret = gst_pad_chain (peer, buffer);
|
|
|
|
gst_object_unref (peer);
|
|
|
|
return ret;
|
|
|
|
/* ERROR recovery here */
|
|
not_linked:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pushing, but it was not linked");
|
|
GST_UNLOCK (pad);
|
|
return GST_FLOW_NOT_LINKED;
|
|
}
|
|
dropping:
|
|
{
|
|
gst_buffer_unref (buffer);
|
|
gst_object_unref (peer);
|
|
GST_DEBUG ("Dropping buffer due to FALSE probe return");
|
|
/* FIXME, failure? */
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_check_pull_range:
|
|
* @pad: a sink #GstPad.
|
|
*
|
|
* Checks if a #gst_pad_pull_range() can be performed on the peer
|
|
* source pad. This function is used by plugins that want to check
|
|
* if they can use random access on the peer source pad.
|
|
*
|
|
* The peer sourcepad can implement a custom #GstPadCheckGetRangeFunction
|
|
* if it needs to perform some logic to determine if pull_range is
|
|
* possible.
|
|
*
|
|
* Returns: a gboolean with the result.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_check_pull_range (GstPad * pad)
|
|
{
|
|
GstPad *peer;
|
|
gboolean ret;
|
|
GstPadCheckGetRangeFunction checkgetrangefunc;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
if (GST_PAD_DIRECTION (pad) != GST_PAD_SINK)
|
|
goto wrong_direction;
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto not_connected;
|
|
|
|
gst_object_ref (peer);
|
|
GST_UNLOCK (pad);
|
|
|
|
/* see note in above function */
|
|
if (G_LIKELY ((checkgetrangefunc = peer->checkgetrangefunc) == NULL)) {
|
|
/* FIXME, kindoff ghetto */
|
|
ret = GST_PAD_GETRANGEFUNC (peer) != NULL;
|
|
} else {
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling checkgetrangefunc %s of peer pad %s:%s",
|
|
GST_DEBUG_FUNCPTR_NAME (checkgetrangefunc), GST_DEBUG_PAD_NAME (peer));
|
|
|
|
ret = checkgetrangefunc (peer);
|
|
}
|
|
|
|
gst_object_unref (peer);
|
|
|
|
return ret;
|
|
|
|
/* ERROR recovery here */
|
|
wrong_direction:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
not_connected:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"checking pull range, but it was not linked");
|
|
GST_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_get_range:
|
|
* @pad: a src #GstPad.
|
|
* @buffer: a pointer to hold the #GstBuffer.
|
|
* @offset: The start offset of the buffer
|
|
* @length: The length of the buffer
|
|
*
|
|
* Calls the getrange function of @pad.
|
|
*
|
|
* Returns: a #GstFlowReturn from the pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_get_range (GstPad * pad, guint64 offset, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
GstFlowReturn ret;
|
|
GstPadGetRangeFunction getrangefunc;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SRC, GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
|
|
GST_LOCK (pad);
|
|
if (G_UNLIKELY (GST_PAD_IS_FLUSHING (pad)))
|
|
goto flushing;
|
|
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
GST_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY ((getrangefunc = GST_PAD_GETRANGEFUNC (pad)) == NULL))
|
|
goto no_function;
|
|
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"calling getrangefunc %s of peer pad %s:%s, offset %"
|
|
G_GUINT64_FORMAT ", size %u",
|
|
GST_DEBUG_FUNCPTR_NAME (getrangefunc), GST_DEBUG_PAD_NAME (pad),
|
|
offset, size);
|
|
|
|
ret = getrangefunc (pad, offset, size, buffer);
|
|
|
|
/* can only fire the signal if we have a valid buffer */
|
|
if (G_UNLIKELY (emit_signal) && (ret == GST_FLOW_OK)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (*buffer)))
|
|
goto dropping;
|
|
}
|
|
|
|
GST_STREAM_UNLOCK (pad);
|
|
|
|
return ret;
|
|
|
|
/* ERRORS */
|
|
flushing:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pulling range, but pad was flushing");
|
|
GST_UNLOCK (pad);
|
|
GST_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
no_function:
|
|
{
|
|
GST_ELEMENT_ERROR (GST_PAD_PARENT (pad), CORE, PAD, (NULL),
|
|
("pullrange on pad %s:%s but it has no getrangefunction",
|
|
GST_DEBUG_PAD_NAME (pad)));
|
|
GST_STREAM_UNLOCK (pad);
|
|
return GST_FLOW_ERROR;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_DEBUG ("Dropping data after FALSE probe return");
|
|
GST_STREAM_UNLOCK (pad);
|
|
gst_buffer_unref (*buffer);
|
|
*buffer = NULL;
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_pad_pull_range:
|
|
* @pad: a sink #GstPad.
|
|
* @buffer: a pointer to hold the #GstBuffer.
|
|
* @offset: The start offset of the buffer
|
|
* @length: The length of the buffer
|
|
*
|
|
* Pulls a buffer from the peer pad. @pad must be linked.
|
|
*
|
|
* Returns: a #GstFlowReturn from the peer pad.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
GstFlowReturn
|
|
gst_pad_pull_range (GstPad * pad, guint64 offset, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
GstPad *peer;
|
|
GstFlowReturn ret;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
|
g_return_val_if_fail (GST_PAD_DIRECTION (pad) == GST_PAD_SINK,
|
|
GST_FLOW_ERROR);
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
while (G_UNLIKELY (GST_PAD_IS_BLOCKED (pad)))
|
|
handle_pad_block (pad);
|
|
|
|
if (G_UNLIKELY ((peer = GST_PAD_PEER (pad)) == NULL))
|
|
goto not_connected;
|
|
|
|
/* signal emision for the pad, peer has chance to emit when
|
|
* we call _get_range() */
|
|
emit_signal = GST_PAD_DO_BUFFER_SIGNALS (pad) > 0;
|
|
|
|
gst_object_ref (peer);
|
|
GST_UNLOCK (pad);
|
|
|
|
ret = gst_pad_get_range (peer, offset, size, buffer);
|
|
|
|
gst_object_unref (peer);
|
|
|
|
/* can only fire the signal if we have a valid buffer */
|
|
if (G_UNLIKELY (emit_signal) && (ret == GST_FLOW_OK)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (*buffer)))
|
|
goto dropping;
|
|
}
|
|
return ret;
|
|
|
|
/* ERROR recovery here */
|
|
not_connected:
|
|
{
|
|
GST_CAT_LOG_OBJECT (GST_CAT_SCHEDULING, pad,
|
|
"pulling range, but it was not linked");
|
|
GST_UNLOCK (pad);
|
|
return GST_FLOW_NOT_LINKED;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_DEBUG ("Dropping data after FALSE probe return");
|
|
gst_buffer_unref (*buffer);
|
|
*buffer = NULL;
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_push_event:
|
|
* @pad: a #GstPad to push the event to.
|
|
* @event: the #GstEvent to send to the pad.
|
|
*
|
|
* Sends the event to the peer of the given pad. This function is
|
|
* mainly used by elements to send events to their peer
|
|
* elements.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
gboolean
|
|
gst_pad_push_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstPad *peerpad;
|
|
gboolean result;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
peerpad = GST_PAD_PEER (pad);
|
|
if (peerpad == NULL)
|
|
goto not_linked;
|
|
|
|
emit_signal = GST_PAD_DO_EVENT_SIGNALS (pad) > 0;
|
|
|
|
gst_object_ref (peerpad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (event)))
|
|
goto dropping;
|
|
}
|
|
|
|
result = gst_pad_send_event (peerpad, event);
|
|
|
|
gst_object_unref (peerpad);
|
|
|
|
return result;
|
|
|
|
/* ERROR handling */
|
|
not_linked:
|
|
{
|
|
gst_event_unref (event);
|
|
GST_UNLOCK (pad);
|
|
return FALSE;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_DEBUG ("Dropping event after FALSE probe return");
|
|
gst_object_unref (peerpad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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. This function can be used
|
|
* by applications to send events in the pipeline.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*/
|
|
gboolean
|
|
gst_pad_send_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstPadEventFunction eventfunc;
|
|
gboolean emit_signal;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (event != NULL, FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
|
|
if (GST_EVENT_SRC (event) == NULL)
|
|
GST_EVENT_SRC (event) = gst_object_ref (pad);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_FLUSH:
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "have event type %d (FLUSH) on pad %s:%s",
|
|
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_EVENT_FLUSH_DONE (event)) {
|
|
GST_PAD_UNSET_FLUSHING (pad);
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "cleared flush flag");
|
|
} else {
|
|
/* can't even accept a flush begin event when flushing */
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushing;
|
|
GST_PAD_SET_FLUSHING (pad);
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "set flush flag");
|
|
}
|
|
break;
|
|
default:
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "have event type %d on pad %s:%s",
|
|
GST_EVENT_TYPE (event), GST_DEBUG_PAD_NAME (pad));
|
|
|
|
if (GST_PAD_IS_FLUSHING (pad))
|
|
goto flushing;
|
|
break;
|
|
}
|
|
|
|
if ((eventfunc = GST_PAD_EVENTFUNC (pad)) == NULL)
|
|
goto no_function;
|
|
|
|
emit_signal = GST_PAD_DO_EVENT_SIGNALS (pad) > 0;
|
|
|
|
gst_object_ref (pad);
|
|
GST_UNLOCK (pad);
|
|
|
|
if (G_UNLIKELY (emit_signal)) {
|
|
if (!gst_pad_emit_have_data_signal (pad, GST_MINI_OBJECT (event)))
|
|
goto dropping;
|
|
}
|
|
|
|
result = eventfunc (GST_PAD_CAST (pad), event);
|
|
|
|
gst_object_unref (pad);
|
|
|
|
return result;
|
|
|
|
/* ERROR handling */
|
|
no_function:
|
|
{
|
|
g_warning ("pad %s:%s has no event handler, file a bug.",
|
|
GST_DEBUG_PAD_NAME (pad));
|
|
GST_UNLOCK (pad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
flushing:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
GST_CAT_DEBUG (GST_CAT_EVENT, "Received event on flushing pad. Discarding");
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
dropping:
|
|
{
|
|
GST_DEBUG ("Dropping event after FALSE probe return");
|
|
gst_object_unref (pad);
|
|
gst_event_unref (event);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/************************************************************************
|
|
*
|
|
* 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_static_pad_template_get_caps:
|
|
* @templ: a #GstStaticPadTemplate to get capabilities of.
|
|
*
|
|
* Gets the capabilities of the static pad template.
|
|
*
|
|
* Returns: the #GstCaps of the static pad template. If you need to keep a
|
|
* reference to the caps, take a ref (see gst_caps_ref ()).
|
|
*/
|
|
GstCaps *
|
|
gst_static_pad_template_get_caps (GstStaticPadTemplate * templ)
|
|
{
|
|
g_return_val_if_fail (templ, NULL);
|
|
|
|
return (GstCaps *) gst_static_caps_get (&templ->static_caps);
|
|
}
|
|
|
|
/**
|
|
* 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, take a ref (see gst_caps_ref ()).
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* gst_pad_start_task:
|
|
* @pad: the #GstPad to start the task of
|
|
* @func: the task function to call
|
|
* @data: data passed to the task function
|
|
*
|
|
* Starts a task that repeadedly calls @func with @data. This function
|
|
* is nostly used in the pad activation function to start the
|
|
* dataflow. This function will automatically acauire the STREAM_LOCK of
|
|
* the pad before calling @func.
|
|
*
|
|
* Returns: a TRUE if the task could be started. FALSE when the pad has
|
|
* no parent or the parent has no scheduler.
|
|
*/
|
|
gboolean
|
|
gst_pad_start_task (GstPad * pad, GstTaskFunction func, gpointer data)
|
|
{
|
|
GstElement *parent;
|
|
GstScheduler *sched;
|
|
GstTask *task;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
g_return_val_if_fail (func != NULL, FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
parent = GST_PAD_PARENT (pad);
|
|
|
|
if (parent == NULL || !GST_IS_ELEMENT (parent))
|
|
goto no_parent;
|
|
|
|
sched = GST_ELEMENT_SCHEDULER (parent);
|
|
if (sched == NULL)
|
|
goto no_sched;
|
|
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL) {
|
|
task = gst_scheduler_create_task (sched, func, data);
|
|
gst_task_set_lock (task, GST_STREAM_GET_LOCK (pad));
|
|
|
|
GST_PAD_TASK (pad) = task;
|
|
}
|
|
GST_UNLOCK (pad);
|
|
|
|
gst_task_start (task);
|
|
|
|
return TRUE;
|
|
|
|
/* ERRORS */
|
|
no_parent:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
GST_DEBUG ("no parent");
|
|
return FALSE;
|
|
}
|
|
no_sched:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
GST_DEBUG ("no scheduler");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_pause_task:
|
|
* @pad: the #GstPad to pause the task of
|
|
*
|
|
* Pause the task of @pad. This function will also make sure that the
|
|
* function executed by the task will effectively stop.
|
|
*
|
|
* Returns: a TRUE if the task could be paused or FALSE when the pad
|
|
* has no task.
|
|
*/
|
|
gboolean
|
|
gst_pad_pause_task (GstPad * pad)
|
|
{
|
|
GstTask *task;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL)
|
|
goto no_task;
|
|
gst_task_pause (task);
|
|
GST_UNLOCK (pad);
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
GST_STREAM_UNLOCK (pad);
|
|
|
|
return TRUE;
|
|
|
|
no_task:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_pad_stop_task:
|
|
* @pad: the #GstPad to stop the task of
|
|
*
|
|
* Stop the task of @pad. This function will also make sure that the
|
|
* function executed by the task will effectively stop.
|
|
*
|
|
* Returns: a TRUE if the task could be stopped or FALSE when the pad
|
|
* has no task.
|
|
*/
|
|
gboolean
|
|
gst_pad_stop_task (GstPad * pad)
|
|
{
|
|
GstTask *task;
|
|
|
|
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
|
|
|
|
GST_LOCK (pad);
|
|
task = GST_PAD_TASK (pad);
|
|
if (task == NULL)
|
|
goto no_task;
|
|
GST_PAD_TASK (pad) = NULL;
|
|
GST_UNLOCK (pad);
|
|
|
|
gst_task_stop (task);
|
|
|
|
GST_STREAM_LOCK (pad);
|
|
GST_STREAM_UNLOCK (pad);
|
|
|
|
gst_object_unref (task);
|
|
|
|
return TRUE;
|
|
|
|
no_task:
|
|
{
|
|
GST_UNLOCK (pad);
|
|
return TRUE;
|
|
}
|
|
}
|