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-rw-r--r--gst/debugutils/negotiation.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/gst/debugutils/negotiation.c b/gst/debugutils/negotiation.c
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+++ b/gst/debugutils/negotiation.c
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+/*
+ * GStreamer
+ * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2002 David A. Schleef <ds@schleef.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <gst/gst.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+
+#define GST_TYPE_NEGOTIATION \
+ (gst_gst_negotiation_get_type())
+#define GST_NEGOTIATION(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_NEGOTIATION,GstNegotiation))
+#define GST_NEGOTIATION_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_NEGOTIATION,GstNegotiation))
+#define GST_IS_NEGOTIATION(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_NEGOTIATION))
+#define GST_IS_NEGOTIATION_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_NEGOTIATION))
+
+typedef struct _GstNegotiation GstNegotiation;
+typedef struct _GstNegotiationClass GstNegotiationClass;
+
+struct _GstNegotiation
+{
+ GstElement element;
+
+ GstPad *sinkpad, *srcpad;
+
+ GstCaps *caps;
+};
+
+struct _GstNegotiationClass
+{
+ GstElementClass parent_class;
+};
+
+GType gst_gst_negotiation_get_type (void);
+
+
+static const GstElementDetails plugin_details =
+GST_ELEMENT_DETAILS ("Negotiation",
+ "Testing",
+ "This element acts like identity, except that one can control how "
+ "negotiation works",
+ "David A. Schleef <ds@schleef.org>");
+
+/* Filter signals and args */
+enum
+{
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum
+{
+ ARG_0,
+ ARG_ALLOWED_CAPS
+};
+
+static GstStaticPadTemplate gst_negotiation_sink_factory =
+GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate gst_negotiation_src_factory =
+GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+
+static void gst_negotiation_base_init (gpointer g_class);
+static void gst_negotiation_class_init (GstNegotiationClass * klass);
+static void gst_negotiation_init (GstNegotiation * filter);
+
+static GstCaps *gst_negotiation_getcaps (GstPad * pad);
+static GstPadLinkReturn gst_negotiation_pad_link (GstPad * pad,
+ const GstCaps * caps);
+
+static void gst_negotiation_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_negotiation_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+static void gst_negotiation_update_caps (GstNegotiation * negotiation);
+static void gst_negotiation_chain (GstPad * pad, GstData * _data);
+
+static GstElementClass *parent_class = NULL;
+
+GType
+gst_gst_negotiation_get_type (void)
+{
+ static GType plugin_type = 0;
+
+ if (!plugin_type) {
+ static const GTypeInfo plugin_info = {
+ sizeof (GstNegotiationClass),
+ gst_negotiation_base_init,
+ NULL,
+ (GClassInitFunc) gst_negotiation_class_init,
+ NULL,
+ NULL,
+ sizeof (GstNegotiation),
+ 0,
+ (GInstanceInitFunc) gst_negotiation_init,
+ };
+
+ plugin_type = g_type_register_static (GST_TYPE_ELEMENT,
+ "GstNegotiation", &plugin_info, 0);
+ }
+ return plugin_type;
+}
+
+static void
+gst_negotiation_base_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_negotiation_sink_factory));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&gst_negotiation_src_factory));
+ gst_element_class_set_details (element_class, &plugin_details);
+}
+
+static void
+gst_negotiation_class_init (GstNegotiationClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstElementClass *gstelement_class;
+
+ gobject_class = (GObjectClass *) klass;
+ gstelement_class = (GstElementClass *) klass;
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->set_property = gst_negotiation_set_property;
+ gobject_class->get_property = gst_negotiation_get_property;
+
+ g_object_class_install_property (gobject_class, ARG_ALLOWED_CAPS,
+ g_param_spec_boxed ("allowed-caps", "Caps",
+ "The range of formats allowed by " "this element's peers",
+ GST_TYPE_CAPS, G_PARAM_READABLE));
+}
+
+static void
+gst_negotiation_init (GstNegotiation * filter)
+{
+ filter->sinkpad =
+ gst_pad_new_from_static_template (&gst_negotiation_sink_factory, "sink");
+ gst_pad_set_getcaps_function (filter->sinkpad, gst_negotiation_getcaps);
+ gst_pad_set_link_function (filter->sinkpad, gst_negotiation_pad_link);
+ filter->srcpad =
+ gst_pad_new_from_static_template (&gst_negotiation_src_factory, "src");
+ gst_pad_set_getcaps_function (filter->srcpad, gst_negotiation_getcaps);
+ gst_pad_set_link_function (filter->srcpad, gst_negotiation_pad_link);
+
+ gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+ gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+ gst_pad_set_chain_function (filter->sinkpad, gst_negotiation_chain);
+}
+
+static GstCaps *
+gst_negotiation_getcaps (GstPad * pad)
+{
+ GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
+ GstPad *otherpad;
+ GstCaps *caps;
+
+ otherpad = (pad == negotiation->sinkpad) ? negotiation->srcpad :
+ negotiation->sinkpad;
+
+ caps = gst_pad_get_allowed_caps (otherpad);
+
+ GST_ERROR ("getcaps called on %" GST_PTR_FORMAT ", returning %"
+ GST_PTR_FORMAT, pad, caps);
+
+ gst_negotiation_update_caps (negotiation);
+ gst_object_unref (negotiation);
+
+ return caps;
+}
+
+static GstPadLinkReturn
+gst_negotiation_pad_link (GstPad * pad, const GstCaps * caps)
+{
+ GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
+ GstPad *otherpad;
+ GstPadLinkReturn ret;
+
+ otherpad = (pad == negotiation->sinkpad) ? negotiation->srcpad :
+ negotiation->sinkpad;
+
+ ret = gst_pad_try_set_caps (otherpad, caps);
+
+ GST_ERROR ("pad_link called on %" GST_PTR_FORMAT " with caps %"
+ GST_PTR_FORMAT ", returning %d", pad, caps, ret);
+ gst_object_unref (negotiation);
+
+ return ret;
+}
+
+static void
+gst_negotiation_update_caps (GstNegotiation * negotiation)
+{
+ GstCaps *srccaps;
+ GstCaps *sinkcaps;
+ GstCaps *icaps;
+
+ srccaps = gst_pad_get_allowed_caps (negotiation->srcpad);
+ sinkcaps = gst_pad_get_allowed_caps (negotiation->sinkpad);
+
+ icaps = gst_caps_intersect (srccaps, sinkcaps);
+ gst_caps_free (srccaps);
+ gst_caps_free (sinkcaps);
+
+ gst_caps_replace (&negotiation->caps, icaps);
+ g_object_notify (G_OBJECT (negotiation), "allowed-caps");
+ GST_DEBUG ("notify %" GST_PTR_FORMAT, icaps);
+}
+
+static void
+gst_negotiation_chain (GstPad * pad, GstData * _data)
+{
+ GstNegotiation *negotiation = GST_NEGOTIATION (gst_pad_get_parent (pad));
+
+ gst_pad_push (negotiation->srcpad, _data);
+ gst_object_unref (negotiation);
+}
+
+static void
+gst_negotiation_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstNegotiation *filter;
+
+ g_return_if_fail (GST_IS_NEGOTIATION (object));
+ filter = GST_NEGOTIATION (object);
+
+ switch (prop_id) {
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_negotiation_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstNegotiation *filter;
+
+ g_return_if_fail (GST_IS_NEGOTIATION (object));
+ filter = GST_NEGOTIATION (object);
+
+ switch (prop_id) {
+ case ARG_ALLOWED_CAPS:
+ g_value_set_boxed (value, filter->caps);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
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