gstreamer/gst/debugutils/gstcapssetter.c

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/* GStreamer Element
* Copyright (C) 2006-2009 Mark Nauwelaerts <mnauw@users.sourceforge.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1307, USA.
*/
/**
* SECTION:element-capssetter
* @title: capssetter
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*
* Sets or merges caps on a stream's buffers. That is, a buffer's caps are
* updated using (fields of) #GstCapsSetter:caps. Note that this may contain
* multiple structures (though not likely recommended), but each of these must
* be fixed (or will otherwise be rejected).
*
* If #GstCapsSetter:join is %TRUE, then the incoming caps' mime-type is
* compared to the mime-type(s) of provided caps and only matching structure(s)
* are considered for updating.
*
* If #GstCapsSetter:replace is %TRUE, then any caps update is preceded by
* clearing existing fields, making provided fields (as a whole) replace
* incoming ones. Otherwise, no clearing is performed, in which case provided
* fields are added/merged onto incoming caps
*
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* Although this element might mainly serve as debug helper,
* it can also practically be used to correct a faulty pixel-aspect-ratio,
* or to modify a yuv fourcc value to effectively swap chroma components or such
* alike.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstcapssetter.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (caps_setter_debug);
#define GST_CAT_DEFAULT caps_setter_debug
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_CAPS,
PROP_JOIN,
PROP_REPLACE
/* FILL ME */
};
#define DEFAULT_JOIN TRUE
#define DEFAULT_REPLACE FALSE
static GstStaticPadTemplate gst_caps_setter_src_template =
GST_STATIC_PAD_TEMPLATE (GST_BASE_TRANSFORM_SRC_NAME,
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_caps_setter_sink_template =
GST_STATIC_PAD_TEMPLATE (GST_BASE_TRANSFORM_SINK_NAME,
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static gboolean gst_caps_setter_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, gsize size,
GstCaps * othercaps, gsize * othersize);
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static GstCaps *gst_caps_setter_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * cfilter);
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static GstFlowReturn gst_caps_setter_transform_ip (GstBaseTransform * btrans,
GstBuffer * in);
static void gst_caps_setter_finalize (GObject * object);
static void gst_caps_setter_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_caps_setter_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
#define gst_caps_setter_parent_class parent_class
G_DEFINE_TYPE (GstCapsSetter, gst_caps_setter, GST_TYPE_BASE_TRANSFORM);
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static void
gst_caps_setter_class_init (GstCapsSetterClass * g_class)
{
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GObjectClass *gobject_class = (GObjectClass *) g_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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GstBaseTransformClass *trans_class = (GstBaseTransformClass *) g_class;
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GST_DEBUG_CATEGORY_INIT (caps_setter_debug, "capssetter", 0, "capssetter");
gobject_class->set_property = gst_caps_setter_set_property;
gobject_class->get_property = gst_caps_setter_get_property;
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gobject_class->finalize = gst_caps_setter_finalize;
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g_object_class_install_property (gobject_class, PROP_CAPS,
g_param_spec_boxed ("caps", "Merge caps",
"Merge these caps (thereby overwriting) in the stream",
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GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_JOIN,
g_param_spec_boolean ("join", "Join",
"Match incoming caps' mime-type to mime-type of provided caps",
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DEFAULT_JOIN, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_REPLACE,
g_param_spec_boolean ("replace", "Replace",
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"Drop fields of incoming caps", DEFAULT_REPLACE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_set_static_metadata (element_class, "CapsSetter",
"Generic",
"Set/merge caps on stream",
"Mark Nauwelaerts <mnauw@users.sourceforge.net>");
gst_element_class_add_static_pad_template (element_class,
&gst_caps_setter_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_caps_setter_src_template);
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trans_class->transform_size =
GST_DEBUG_FUNCPTR (gst_caps_setter_transform_size);
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_caps_setter_transform_caps);
/* dummy seems needed */
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_caps_setter_transform_ip);
}
static void
gst_caps_setter_init (GstCapsSetter * filter)
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{
filter->caps = gst_caps_new_any ();
filter->join = DEFAULT_JOIN;
filter->replace = DEFAULT_REPLACE;
}
static void
gst_caps_setter_finalize (GObject * object)
{
GstCapsSetter *filter = GST_CAPS_SETTER (object);
gst_caps_replace (&filter->caps, NULL);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_caps_setter_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, gsize size,
GstCaps * othercaps, gsize * othersize)
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{
*othersize = size;
return TRUE;
}
static GstCaps *
gst_caps_setter_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * cfilter)
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{
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GstCapsSetter *filter = GST_CAPS_SETTER (trans);
GstCaps *ret = NULL, *filter_caps = NULL;
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GstStructure *structure, *merge;
const gchar *name;
gint i, j, k;
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GST_DEBUG_OBJECT (trans,
"receiving caps: %" GST_PTR_FORMAT ", with filter: %" GST_PTR_FORMAT,
caps, cfilter);
/* pass filter caps upstream, or any if no filter */
if (direction != GST_PAD_SINK) {
if (!cfilter || gst_caps_is_empty (cfilter)) {
return gst_caps_ref (GST_CAPS_ANY);
} else {
return gst_caps_ref (cfilter);
}
}
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ret = gst_caps_copy (caps);
GST_OBJECT_LOCK (filter);
filter_caps = gst_caps_ref (filter->caps);
GST_OBJECT_UNLOCK (filter);
for (k = 0; k < gst_caps_get_size (ret); k++) {
structure = gst_caps_get_structure (ret, k);
name = gst_structure_get_name (structure);
for (i = 0; i < gst_caps_get_size (filter_caps); ++i) {
merge = gst_caps_get_structure (filter_caps, i);
if (gst_structure_has_name (merge, name) || !filter->join) {
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if (!filter->join)
gst_structure_set_name (structure, gst_structure_get_name (merge));
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if (filter->replace)
gst_structure_remove_all_fields (structure);
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for (j = 0; j < gst_structure_n_fields (merge); ++j) {
const gchar *fname;
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fname = gst_structure_nth_field_name (merge, j);
gst_structure_set_value (structure, fname,
gst_structure_get_value (merge, fname));
}
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}
}
}
GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
gst_caps_unref (filter_caps);
return ret;
}
static GstFlowReturn
gst_caps_setter_transform_ip (GstBaseTransform * btrans, GstBuffer * in)
{
return GST_FLOW_OK;
}
static gboolean
gst_caps_is_fixed_foreach (GQuark field_id, const GValue * value,
gpointer unused)
{
return gst_value_is_fixed (value);
}
static void
gst_caps_setter_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
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GstCapsSetter *filter = GST_CAPS_SETTER (object);
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switch (prop_id) {
case PROP_CAPS:{
GstCaps *new_caps;
const GstCaps *new_caps_val = gst_value_get_caps (value);
gint i;
if (new_caps_val == NULL) {
new_caps = gst_caps_new_any ();
} else {
new_caps = gst_caps_copy (new_caps_val);
}
for (i = 0; new_caps && (i < gst_caps_get_size (new_caps)); ++i) {
GstStructure *s;
s = gst_caps_get_structure (new_caps, i);
if (!gst_structure_foreach (s, gst_caps_is_fixed_foreach, NULL)) {
GST_ERROR_OBJECT (filter, "rejected unfixed caps: %" GST_PTR_FORMAT,
new_caps);
gst_caps_unref (new_caps);
new_caps = NULL;
break;
}
}
if (new_caps) {
GST_OBJECT_LOCK (filter);
gst_caps_replace (&filter->caps, new_caps);
/* drop extra ref */
gst_caps_unref (new_caps);
GST_OBJECT_UNLOCK (filter);
GST_DEBUG_OBJECT (filter, "set new caps %" GST_PTR_FORMAT, new_caps);
}
/* try to activate these new caps next time around */
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gst_base_transform_reconfigure_src (GST_BASE_TRANSFORM (filter));
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break;
}
case PROP_JOIN:
filter->join = g_value_get_boolean (value);
break;
case PROP_REPLACE:
filter->replace = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_caps_setter_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
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GstCapsSetter *filter = GST_CAPS_SETTER (object);
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switch (prop_id) {
case PROP_CAPS:
gst_value_set_caps (value, filter->caps);
break;
case PROP_JOIN:
g_value_set_boolean (value, filter->join);
break;
case PROP_REPLACE:
g_value_set_boolean (value, filter->replace);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}