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gstreamer/libs/gst/base/gstbasetransform.c
Tim-Philipp Müller 9894c90109 gst/: Don't put functional code in g_return_if_fail() or g_return_val_if_fail() statements, otherwise things will bre... 
Original commit message from CVS:
* gst/base/gstbasetransform.c: (gst_base_transform_transform_size):
* gst/gstutils.c: (gst_util_set_value_from_string),
(gst_util_set_object_arg):
Don't put functional code in g_return_if_fail() or
g_return_val_if_fail() statements, otherwise things will
break when G_DISABLE_CHECKS is defined during compilation.
2005-09-21 11:52:04 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
* 2005 Andy Wingo <wingo@fluendo.com>
* 2005 Thomas Vander Stichele <thomas at apestaart dot 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.
*/
/**
* SECTION:gstbasetransform
* @short_description: Base class for simple tranform filters
* @see_also: #GstBaseSrc, #GstBaseSink
*
* This base class is for filter elements that process data.
*
* It provides for:
* <itemizedlist>
* <listitem><para>one sinkpad and one srcpad</para></listitem>
* <listitem><para>
* Possible formats on sink and source pad implemented
* with custom transform_caps function. By default uses
* same format on sink and source.
* </para></listitem>
* <listitem><para>Handles state changes</para></listitem>
* <listitem><para>Does flushing</para></listitem>
* <listitem><para>Push mode</para></listitem>
* <listitem><para>
* Pull mode if the sub-class transform can operate on arbitrary data
* </para></listitem>
* </itemizedlist>
*
* Use Cases:
* <orderedlist>
* <listitem>
* <itemizedlist><title>Passthrough mode</title>
* <listitem><para>
* Element has no interest in modifying the buffer. It may want to inspect it,
* in which case the element should have a transform_ip function. If there
* is no transform_ip function in passthrough mode, the buffer is pushed
* intact.
* </para></listitem>
* <listitem><para>
* On the GstBaseTransformClass is the passthrough_on_same_caps variable
* which will automatically set/unset passthrough based on whether the
* element negotiates the same caps on both pads.
* </para></listitem>
* <listitem><para>
* passthrough_on_same_caps on an element that doesn't implement a transform_caps
* function is useful for elements that only inspect data (such as level)
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Level</listitem>
* <listitem>Videoscale, audioconvert, ffmpegcolorspace, audioresample in certain modes.</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Modifications in-place - input buffer and output buffer are the same thing.</title>
* <listitem><para>
* The element must implement a transform_ip function.
* </para></listitem>
* <listitem><para>
* Output buffer size must <= input buffer size
* </para></listitem>
* <listitem><para>
* If the always_in_place flag is set, non-writable buffers will be copied and
* passed to the transform_ip function, otherwise a new buffer will be created
* and the transform function called.
* </para></listitem>
* <listitem><para>
* Incoming writable buffers will be passed to the transform_ip function immediately.
* </para></listitem>
* <listitem><para>
* only implementing transform_ip and not transform implies always_in_place =
* TRUE
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Volume</listitem>
* <listitem>Audioconvert in certain modes (signed/unsigned conversion)</listitem>
* <listitem>ffmpegcolorspace in certain modes (endianness swapping)</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Modifications only to the caps/metadata of a buffer</title>
* <listitem><para>
* The element does not require writable data, but non-writable buffers should
* be subbuffered so that the meta-information can be replaced.
* </para></listitem>
* <listitem><para>
* Elements wishing to operate in this mode should replace the
* prepare_output_buffer method to create subbuffers of the input buffer and
* set always_in_place to TRUE
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Capsfilter when setting caps on outgoing buffers that have none.</listitem>
* <listitem>identity when it is going to re-timestamp buffers by datarate.</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Normal mode</title>
* <listitem><para>
* always_in_place flag is not set, or there is no transform_ip function
* </para></listitem>
* <listitem><para>
* Element will receive an input buffer and output buffer to operate on.
* </para></listitem>
* <listitem><para>
* Output buffer is allocated by calling the prepare_output_buffer function.
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Videoscale, ffmpegcolorspace, audioconvert when doing scaling/conversions</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Special output buffer allocations</title>
* <listitem><para>
* Elements which need to do special allocation of their output buffers other
* than what gst_buffer_pad_alloc allows should implement a
* prepare_output_buffer method, which calls the parent implementation and
* passes the newly allocated buffer.
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>efence</listitem>
* </itemizedlist>
* </listitem>
* </orderedlist>
*
* <itemizedlist><title>Sub-class settable flags on GstBaseTransform</title>
* <listitem><para>
* <itemizedlist><title>passthrough</title>
* <listitem><para>
* Implies that in the current configuration, the sub-class is not
* interested in modifying the buffers.
* </para></listitem>
* <listitem><para>
* Elements which are always in passthrough mode whenever the same caps has
* been negotiated on both pads can set the class variable
* passthrough_on_same_caps to have this behaviour automatically.
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* <listitem><para>
* <itemizedlist><title>always_in_place</title>
* <listitem><para>
* Determines whether a non-writable buffer will be copied before passing
* to the transform_ip function.
* </para></listitem>
* <listitem><para>
* Implied TRUE if no transform function is implemented.
* </para></listitem>
* <listitem><para>
* Implied FALSE if ONLY transform function is implemented.
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* </itemizedlist>
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "../gst-i18n-lib.h"
#include "gstbasetransform.h"
#include <gst/gstmarshal.h>
GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
#define GST_CAT_DEFAULT gst_base_transform_debug
/* BaseTransform signals and args */
enum
{
SIGNAL_HANDOFF,
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
};
static GstElementClass *parent_class = NULL;
static void gst_base_transform_base_init (gpointer g_class);
static void gst_base_transform_class_init (GstBaseTransformClass * klass);
static void gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * klass);
static GstFlowReturn gst_base_transform_prepare_output_buf (GstBaseTransform *
trans, GstBuffer * input, gint size, GstCaps * caps, GstBuffer ** buf);
GType
gst_base_transform_get_type (void)
{
static GType base_transform_type = 0;
if (!base_transform_type) {
static const GTypeInfo base_transform_info = {
sizeof (GstBaseTransformClass),
(GBaseInitFunc) gst_base_transform_base_init,
NULL,
(GClassInitFunc) gst_base_transform_class_init,
NULL,
NULL,
sizeof (GstBaseTransform),
0,
(GInstanceInitFunc) gst_base_transform_init,
};
base_transform_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
}
return base_transform_type;
}
static void gst_base_transform_finalize (GObject * object);
static void gst_base_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_transform_src_activate_pull (GstPad * pad,
gboolean active);
static gboolean gst_base_transform_sink_activate_push (GstPad * pad,
gboolean active);
static gboolean gst_base_transform_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static GstStateChangeReturn gst_base_transform_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_base_transform_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer);
static GstFlowReturn gst_base_transform_chain (GstPad * pad,
GstBuffer * buffer);
static GstCaps *gst_base_transform_getcaps (GstPad * pad);
static gboolean gst_base_transform_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_base_transform_buffer_alloc (GstPad * pad,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_base_transform_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
"basetransform element");
}
static void
gst_base_transform_finalize (GObject * object)
{
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_transform_class_init (GstBaseTransformClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_base_transform_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_base_transform_get_property);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_transform_finalize);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_transform_change_state);
klass->passthrough_on_same_caps = FALSE;
}
static void
gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * bclass)
{
GstPadTemplate *pad_template;
GST_DEBUG ("gst_base_transform_init");
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
g_return_if_fail (pad_template != NULL);
trans->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_getcaps_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
gst_pad_set_setcaps_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_setcaps));
gst_pad_set_event_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_event));
gst_pad_set_chain_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_chain));
gst_pad_set_activatepush_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_push));
gst_pad_set_bufferalloc_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_buffer_alloc));
gst_element_add_pad (GST_ELEMENT (trans), trans->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
g_return_if_fail (pad_template != NULL);
trans->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_getcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
gst_pad_set_setcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_setcaps));
gst_pad_set_getrange_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getrange));
gst_pad_set_activatepull_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_pull));
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
trans->delay_configure = FALSE;
trans->pending_configure = FALSE;
trans->cache_caps1 = NULL;
trans->cache_caps2 = NULL;
trans->passthrough = FALSE;
if (bclass->transform == NULL) {
/* If no transform function, always_in_place is TRUE */
GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
trans->always_in_place = TRUE;
if (bclass->transform_ip == NULL)
trans->passthrough = TRUE;
}
}
static GstCaps *
gst_base_transform_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *ret;
GstBaseTransformClass *klass;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* if there is a custom transform function, use this */
if (klass->transform_caps) {
GstCaps *temp;
gint i;
ret = gst_caps_new_empty ();
if (gst_caps_is_any (caps)) {
/* for any caps we still have to call the transform function */
GST_DEBUG_OBJECT (trans, "from ANY:");
temp = klass->transform_caps (trans, direction, caps);
GST_DEBUG_OBJECT (trans, " to: %" GST_PTR_FORMAT, temp);
gst_caps_append (ret, temp);
} else {
/* we send caps with just one structure to the transform
* function as this is easier for the element */
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstCaps *nth;
nth = gst_caps_copy_nth (caps, i);
GST_DEBUG_OBJECT (trans, "from[%d]: %" GST_PTR_FORMAT, i, nth);
temp = klass->transform_caps (trans, direction, nth);
gst_caps_unref (nth);
GST_DEBUG_OBJECT (trans, " to[%d]: %" GST_PTR_FORMAT, i, temp);
gst_caps_append (ret, temp);
}
}
gst_caps_do_simplify (ret);
} else {
/* else use the identity transform */
ret = gst_caps_ref (caps);
}
GST_DEBUG_OBJECT (trans, "to: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
gst_base_transform_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps,
guint size, GstCaps * othercaps, guint * othersize)
{
guint inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
gint ret = -1;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans, "asked to transform size %d for caps %"
GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %s",
size, caps, othercaps, direction == GST_PAD_SRC ? "SRC" : "SINK");
/* if there is a custom transform function, use this */
if (klass->transform_size) {
ret = klass->transform_size (trans, direction, caps, size, othercaps,
othersize);
} else {
gboolean got_in_unit_size, got_out_unit_size;
got_in_unit_size = gst_base_transform_get_unit_size (trans, caps,
&inunitsize);
g_return_val_if_fail (got_in_unit_size == TRUE, FALSE);
GST_DEBUG_OBJECT (trans, "input size %d, input unit size %d", size,
inunitsize);
g_return_val_if_fail (inunitsize != 0, FALSE);
if (size % inunitsize != 0) {
g_warning ("Size %u is not a multiple of unit size %u", size, inunitsize);
return FALSE;
}
units = size / inunitsize;
got_out_unit_size = gst_base_transform_get_unit_size (trans, othercaps,
&outunitsize);
g_return_val_if_fail (got_out_unit_size == TRUE, FALSE);
*othersize = units * outunitsize;
GST_DEBUG_OBJECT (trans, "transformed size to %d", *othersize);
}
return ret;
}
static GstCaps *
gst_base_transform_getcaps (GstPad * pad)
{
GstBaseTransform *trans;
GstPad *otherpad;
GstCaps *caps;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
/* we can do what the peer can */
caps = gst_pad_peer_get_caps (otherpad);
if (caps) {
GstCaps *temp;
const GstCaps *templ;
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, caps);
/* filtered against our padtemplate */
templ = gst_pad_get_pad_template_caps (otherpad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
temp = gst_caps_intersect (caps, templ);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (caps);
/* then see what we can tranform this to */
caps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (otherpad), temp);
GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
gst_caps_unref (temp);
if (caps == NULL)
goto done;
/* and filter against the template again */
templ = gst_pad_get_pad_template_caps (pad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
temp = gst_caps_intersect (caps, templ);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (caps);
/* this is what we can do */
caps = temp;
} else {
/* no peer, our padtemplate is enough then */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
done:
GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
gst_object_unref (trans);
return caps;
}
static gboolean
gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
GstCaps * out)
{
gboolean ret = TRUE;
GstBaseTransformClass *klass;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* clear the cache */
gst_caps_replace (&trans->cache_caps1, NULL);
gst_caps_replace (&trans->cache_caps2, NULL);
/* If we've a transform_ip method and same input/output caps, set in_place
* by default. If for some reason the sub-class prefers using a transform
* function, it can clear the in place flag in the set_caps */
gst_base_transform_set_in_place (trans,
klass->transform_ip && trans->have_same_caps);
/* Set the passthrough if the class wants passthrough_on_same_caps
* and we have the same caps on each pad */
if (klass->passthrough_on_same_caps)
gst_base_transform_set_passthrough (trans, trans->have_same_caps);
/* now configure the element with the caps */
if (klass->set_caps) {
GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
ret = klass->set_caps (trans, in, out);
}
trans->negotiated = ret;
return ret;
}
static gboolean
gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseTransform *trans;
GstBaseTransformClass *klass;
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
gboolean peer_checked = FALSE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
/* if we get called recursively, we bail out now to avoid an
* infinite loop. */
if (GST_PAD_IS_IN_SETCAPS (otherpad))
goto done;
/* caps must be fixed here */
if (!gst_caps_is_fixed (caps))
goto unfixed_caps;
/* see how we can transform the input caps. */
othercaps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (pad), caps);
/* The caps we can actually output is the intersection of the transformed
* caps with the pad template for the pad */
if (othercaps) {
GstCaps *intersect;
const GstCaps *templ_caps;
templ_caps = gst_pad_get_pad_template_caps (otherpad);
intersect = gst_caps_intersect (othercaps, templ_caps);
gst_caps_unref (othercaps);
othercaps = intersect;
}
/* check if transform is empty */
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform;
/* if the othercaps are not fixed, we need to fixate them, first attempt
* is by attempting passthrough if the othercaps are a superset of caps. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"transform returned non fixed %" GST_PTR_FORMAT, othercaps);
/* see if the target caps are a superset of the source caps, in this
* case we can try to perform passthrough */
temp = gst_caps_intersect (othercaps, caps);
GST_DEBUG_OBJECT (trans, "intersect returned %" GST_PTR_FORMAT, temp);
if (temp) {
if (!gst_caps_is_empty (temp) && otherpeer) {
GST_DEBUG_OBJECT (trans, "try passthrough with %" GST_PTR_FORMAT, caps);
/* try passthrough. we know it's fixed, because caps is fixed */
if (gst_pad_accept_caps (otherpeer, caps)) {
GST_DEBUG_OBJECT (trans, "peer accepted %" GST_PTR_FORMAT, caps);
/* peer accepted unmodified caps, we free the original non-fixed
* caps and work with the passthrough caps */
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
/* mark that we checked othercaps with the peer, this
* makes sure we don't call accept_caps again with these same
* caps */
peer_checked = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"peer did not accept %" GST_PTR_FORMAT, caps);
}
}
gst_caps_unref (temp);
}
}
/* second attempt at fixation is done by intersecting with
* the peer caps */
if (!gst_caps_is_fixed (othercaps) && otherpeer) {
/* intersect against what the peer can do */
GstCaps *peercaps;
GstCaps *intersect;
GST_DEBUG_OBJECT (trans, "othercaps now %" GST_PTR_FORMAT, othercaps);
peercaps = gst_pad_get_caps (otherpeer);
intersect = gst_caps_intersect (peercaps, othercaps);
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersect;
peer_checked = FALSE;
GST_DEBUG_OBJECT (trans,
"filtering against peer yields %" GST_PTR_FORMAT, othercaps);
}
if (gst_caps_is_empty (othercaps))
goto no_transform_possible;
/* third attempt at fixation, call the fixate vmethod and
* ultimately call the pad fixate function. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
othercaps, GST_DEBUG_PAD_NAME (otherpad));
/* since we have no other way to fixate left, we might as well just take
* the first of the caps list and fixate that */
/* FIXME: when fixating using the vmethod, it might make sense to fixate
* each of the caps; but Wim doesn't see a use case for that yet */
temp = gst_caps_copy_nth (othercaps, 0);
gst_caps_unref (othercaps);
othercaps = temp;
peer_checked = FALSE;
if (klass->fixate_caps) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT
" on pad %s:%s using fixate_caps vmethod", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
}
/* if still not fixed, no other option but to let the default pad fixate
* function do its job */
if (!gst_caps_is_fixed (othercaps)) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" on pad %s:%s using gst_pad_fixate_caps", othercaps,
GST_DEBUG_PAD_NAME (otherpad));
gst_pad_fixate_caps (otherpad, othercaps);
}
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}
/* caps should be fixed now, if not we have to fail. */
if (!gst_caps_is_fixed (othercaps))
goto could_not_fixate;
/* and peer should accept, don't check again if we already checked the
* othercaps against the peer. */
if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
goto peer_no_accept;
GST_DEBUG_OBJECT (trans, "got final caps %" GST_PTR_FORMAT, othercaps);
trans->have_same_caps = gst_caps_is_equal (caps, othercaps);
GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
/* see if we have to configure the element now */
if (!trans->delay_configure) {
GstCaps *incaps, *outcaps;
/* make sure in and out caps are correct */
if (pad == trans->sinkpad) {
incaps = caps;
outcaps = othercaps;
} else {
incaps = othercaps;
outcaps = caps;
}
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
} else {
/* set pending configure, the configure will happen later with the
* caps we set on the pads above. */
trans->pending_configure = TRUE;
}
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
done:
if (otherpeer)
gst_object_unref (otherpeer);
if (othercaps)
gst_caps_unref (othercaps);
trans->negotiated = ret;
gst_object_unref (trans);
return ret;
/* ERRORS */
unfixed_caps:
{
GST_DEBUG_OBJECT (trans, "caps are not fixed %" GST_PTR_FORMAT, caps);
ret = FALSE;
goto done;
}
no_transform:
{
GST_DEBUG_OBJECT (trans,
"transform returned useless %" GST_PTR_FORMAT, othercaps);
ret = FALSE;
goto done;
}
no_transform_possible:
{
GST_DEBUG_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
ret = FALSE;
goto done;
}
could_not_fixate:
{
GST_ERROR_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
ret = FALSE;
goto done;
}
peer_no_accept:
{
GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
failed_configure:
{
GST_DEBUG_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
}
/* Allocate a buffer using gst_pad_alloc_buffer */
static GstFlowReturn
gst_base_transform_prepare_output_buf (GstBaseTransform * trans,
GstBuffer * input, gint size, GstCaps * caps, GstBuffer ** buf)
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
gboolean copy_inbuf = FALSE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->prepare_output_buffer) {
ret = bclass->prepare_output_buffer (trans, input, size, caps, buf);
if (ret != GST_FLOW_OK)
return ret;
}
/* See if we want to prepare the buffer for in place output */
if (*buf == NULL && GST_BUFFER_SIZE (input) == size && bclass->transform_ip) {
if (gst_buffer_is_writable (input)) {
if (trans->have_same_caps) {
/* Input buffer is already writable and caps are the same, just ref and return it */
*buf = input;
gst_buffer_ref (input);
} else {
/* Writable buffer, but need to change caps => subbuffer */
*buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
gst_caps_replace (&GST_BUFFER_CAPS (*buf), caps);
}
return GST_FLOW_OK;
} else {
/* Make a writable buffer below and copy the data */
copy_inbuf = TRUE;
}
}
if (*buf == NULL) {
/* Sub-class didn't already implement a buffer for us. Make one */
ret = gst_pad_alloc_buffer (trans->srcpad, GST_BUFFER_OFFSET (input),
size, caps, buf);
if (ret != GST_FLOW_OK || *buf == NULL)
return ret;
}
/* If the output buffer metadata is modifiable, copy timestamps and
* buffer flags */
if (*buf != input && GST_MINI_OBJECT_REFCOUNT_VALUE (*buf) == 1) {
if (copy_inbuf && gst_buffer_is_writable (*buf))
memcpy (GST_BUFFER_DATA (*buf), GST_BUFFER_DATA (input), size);
gst_buffer_stamp (*buf, input);
GST_BUFFER_FLAGS (*buf) |= GST_BUFFER_FLAGS (input) &
(GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
GST_BUFFER_FLAG_DELTA_UNIT);
}
return ret;
}
static gboolean
gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
guint * size)
{
gboolean res = FALSE;
GstBaseTransformClass *bclass;
/* see if we have the result cached */
if (trans->cache_caps1 == caps) {
*size = trans->cache_caps1_size;
GST_DEBUG_OBJECT (trans, "get size returned cached 1 %d", *size);
return TRUE;
}
if (trans->cache_caps2 == caps) {
*size = trans->cache_caps2_size;
GST_DEBUG_OBJECT (trans, "get size returned cached 2 %d", *size);
return TRUE;
}
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->get_unit_size) {
res = bclass->get_unit_size (trans, caps, size);
GST_DEBUG_OBJECT (trans, "caps %" GST_PTR_FORMAT
") has unit size %d, result %s", caps, *size, res ? "TRUE" : "FALSE");
if (res) {
if (trans->cache_caps1 == NULL) {
gst_caps_replace (&trans->cache_caps1, caps);
trans->cache_caps1_size = *size;
} else if (trans->cache_caps2 == NULL) {
gst_caps_replace (&trans->cache_caps2, caps);
trans->cache_caps2_size = *size;
}
}
} else {
GST_DEBUG ("Sub-class does not implement get_unit_size");
}
return res;
}
/* your upstream peer wants to send you a buffer
* that buffer has the given offset, size and caps
* you're requested to allocate a buffer
*/
static GstFlowReturn
gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstBaseTransform *trans;
GstFlowReturn res;
guint new_size;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
/* we cannot run this when we are processing data or doing another
* negotiation in the streaming thread. */
GST_STREAM_LOCK (pad);
*buf = NULL;
GST_DEBUG_OBJECT (trans, "allocating a buffer of size %d ...", size, offset);
if (offset == GST_BUFFER_OFFSET_NONE)
GST_DEBUG_OBJECT (trans, "... and offset NONE");
else
GST_DEBUG_OBJECT (trans, "... and offset %" G_GUINT64_FORMAT, offset);
/* before any buffers are pushed, have_same_caps is TRUE; allocating can trigger
* a renegotiation and change that to FALSE */
if (trans->have_same_caps) {
/* request a buffer with the same caps */
GST_DEBUG_OBJECT (trans, "requesting buffer with same caps, size %d", size);
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
} else {
/* if we are configured, request a buffer with the src caps */
GstCaps *srccaps = gst_pad_get_negotiated_caps (trans->srcpad);
if (!srccaps)
goto not_configured;
GST_DEBUG_OBJECT (trans, "calling transform_size");
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (pad), caps, size, srccaps, &new_size)) {
gst_caps_unref (srccaps);
goto unknown_size;
}
res = gst_pad_alloc_buffer (trans->srcpad, offset, new_size, srccaps, buf);
gst_caps_unref (srccaps);
}
if (res == GST_FLOW_OK && !trans->have_same_caps) {
/* note that we might have had same caps before, but calling the
alloc_buffer caused setcaps to switch us out of in_place -- in any case
the alloc_buffer served to transmit caps information but we can't use the
buffer. fall through and allocate a buffer corresponding to our sink
caps, if any */
GstCaps *sinkcaps = gst_pad_get_negotiated_caps (trans->sinkpad);
GstCaps *srccaps = gst_pad_get_negotiated_caps (trans->srcpad);
if (!sinkcaps)
goto not_configured;
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->srcpad), srccaps, GST_BUFFER_SIZE (*buf),
sinkcaps, &new_size)) {
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
goto unknown_size;
}
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_size);
gst_buffer_set_caps (*buf, sinkcaps);
GST_BUFFER_OFFSET (*buf) = offset;
res = GST_FLOW_OK;
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
}
GST_STREAM_UNLOCK (pad);
gst_object_unref (trans);
return res;
not_configured:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "not configured");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
}
GST_STREAM_UNLOCK (pad);
gst_object_unref (trans);
return GST_FLOW_OK;
}
unknown_size:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "unknown size");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
}
GST_STREAM_UNLOCK (pad);
gst_object_unref (trans);
return GST_FLOW_OK;
}
}
static gboolean
gst_base_transform_event (GstPad * pad, GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = FALSE;
gboolean unlock;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->event)
bclass->event (trans, event);
unlock = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
break;
case GST_EVENT_FLUSH_STOP:
GST_STREAM_LOCK (pad);
unlock = TRUE;
break;
case GST_EVENT_EOS:
GST_STREAM_LOCK (pad);
unlock = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate;
gint64 start, stop, base;
GST_STREAM_LOCK (pad);
gst_event_parse_newsegment (event, &rate, &format, &start, &stop, &base);
if (format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (trans, "received NEW_SEGMENT %" GST_TIME_FORMAT
" -- %" GST_TIME_FORMAT ", base %" GST_TIME_FORMAT,
start, stop, base);
trans->have_newsegment = TRUE;
trans->segment_start = start;
trans->segment_stop = stop;
trans->segment_base = base;
trans->segment_rate = rate;
} else {
GST_DEBUG_OBJECT (trans,
"received NEW_SEGMENT in non-time format, ignoring");
}
GST_STREAM_UNLOCK (pad);
break;
}
default:
break;
}
ret = gst_pad_event_default (pad, event);
if (unlock)
GST_STREAM_UNLOCK (pad);
gst_object_unref (trans);
return ret;
}
static GstFlowReturn
gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer ** outbuf)
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
guint out_size;
gboolean want_in_place;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
GST_LOG_OBJECT (trans, "handling buffer %p of size %d and offset %"
G_GUINT64_FORMAT, inbuf, GST_BUFFER_SIZE (inbuf),
GST_BUFFER_OFFSET (inbuf));
else
GST_LOG_OBJECT (trans, "handling buffer %p of size %d and offset NONE",
inbuf, GST_BUFFER_SIZE (inbuf));
/* Don't allow buffer handling before negotiation, except in passthrough mode
* or if the class doesn't implement a set_caps function (in which case it doesn't
* care about caps)
*/
if (!trans->negotiated && !trans->passthrough && (bclass->set_caps != NULL))
goto not_negotiated;
if (trans->passthrough) {
/* In passthrough mode, give transform_ip a look at the
* buffer, without making it writable, or just push the
* data through */
GST_LOG_OBJECT (trans, "element is in passthrough mode");
if (bclass->transform_ip)
ret = bclass->transform_ip (trans, inbuf);
*outbuf = inbuf;
return ret;
}
want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
*outbuf = NULL;
if (want_in_place) {
/* If want_in_place is TRUE, we may need to prepare a new output buffer
* Sub-classes can implement a prepare_output_buffer function as they
* wish. */
GST_LOG_OBJECT (trans, "doing inplace transform");
/* we cannot reconfigure the element yet as we are still processing
* the old buffer. We will therefore delay the reconfiguration of the
* element until we have processed this last buffer. */
trans->delay_configure = TRUE;
ret = gst_base_transform_prepare_output_buf (trans, inbuf,
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad), outbuf);
trans->delay_configure = FALSE;
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto no_buffer;
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_LOG_OBJECT (trans, "doing non-inplace transform");
/* not transforming inplace, figure out the output size */
if (trans->always_in_place) {
out_size = GST_BUFFER_SIZE (inbuf);
} else {
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->sinkpad), GST_PAD_CAPS (trans->sinkpad),
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad),
&out_size)) {
/* we have an error */
goto no_size;
}
}
/* we cannot reconfigure the element yet as we are still processing
* the old buffer. We will therefore delay the reconfiguration of the
* element until we have processed this last buffer. */
trans->delay_configure = TRUE;
/* no in place transform, get buffer, this might renegotiate. */
ret = gst_base_transform_prepare_output_buf (trans, inbuf, out_size,
GST_PAD_CAPS (trans->srcpad), outbuf);
trans->delay_configure = FALSE;
if (ret != GST_FLOW_OK)
goto no_buffer;
if (bclass->transform)
ret = bclass->transform (trans, inbuf, *outbuf);
else
ret = GST_FLOW_NOT_SUPPORTED;
}
/* if we got renegotiated we can configure now */
if (trans->pending_configure) {
gboolean success;
success =
gst_base_transform_configure_caps (trans,
GST_PAD_CAPS (trans->sinkpad), GST_PAD_CAPS (trans->srcpad));
trans->pending_configure = FALSE;
if (!success)
goto configure_failed;
}
gst_buffer_unref (inbuf);
return ret;
/* ERRORS */
not_negotiated:
{
gst_buffer_unref (inbuf);
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("not negotiated"), ("not negotiated"));
return GST_FLOW_NOT_NEGOTIATED;
}
no_size:
{
gst_buffer_unref (inbuf);
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("subclass did not specify output size"),
("subclass did not specify output size"));
return GST_FLOW_ERROR;
}
no_buffer:
{
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not get buffer from pool");
return ret;
}
configure_failed:
{
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not negotiate");
return GST_FLOW_NOT_NEGOTIATED;
}
}
/* FIXME, getrange is broken, need to pull range from the other
* end based on the transform_size result.
*/
static GstFlowReturn
gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstBaseTransform *trans;
GstFlowReturn ret;
GstBuffer *inbuf;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
if (ret == GST_FLOW_OK) {
ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
}
gst_object_unref (trans);
return ret;
}
static GstFlowReturn
gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
{
GstBaseTransform *trans;
GstFlowReturn ret;
GstBuffer *outbuf = NULL;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
if (ret == GST_FLOW_OK) {
ret = gst_pad_push (trans->srcpad, outbuf);
} else if (outbuf != NULL)
gst_buffer_unref (outbuf);
gst_object_unref (trans);
return ret;
}
static void
gst_base_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_base_transform_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (active) {
if (bclass->start)
result = bclass->start (trans);
}
gst_object_unref (trans);
return result;
}
static gboolean
gst_base_transform_src_activate_pull (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
result = gst_pad_activate_pull (trans->sinkpad, active);
if (active) {
if (result && bclass->start)
result &= bclass->start (trans);
}
gst_object_unref (trans);
return result;
}
static GstStateChangeReturn
gst_base_transform_change_state (GstElement * element,
GstStateChange transition)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
GstStateChangeReturn result;
trans = GST_BASE_TRANSFORM (element);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_LOCK (trans);
if (GST_PAD_CAPS (trans->sinkpad) && GST_PAD_CAPS (trans->srcpad))
trans->have_same_caps =
gst_caps_is_equal (GST_PAD_CAPS (trans->sinkpad),
GST_PAD_CAPS (trans->srcpad)) || trans->passthrough;
else
trans->have_same_caps = trans->passthrough;
GST_DEBUG_OBJECT (trans, "have_same_caps %d", trans->have_same_caps);
gst_caps_replace (&trans->cache_caps1, NULL);
gst_caps_replace (&trans->cache_caps2, NULL);
trans->negotiated = FALSE;
GST_UNLOCK (trans);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (bclass->stop)
result = bclass->stop (trans);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return result;
}
/**
* gst_base_transform_set_passthrough:
* @trans: the #GstBaseTransform to set
* @passthrough: boolean indicating passthrough mode.
*
* Set passthrough mode for this filter by default. This is mostly
* useful for filters that do not care about negotiation.
*
* Always TRUE for filters which don't implement either a transform
* or transform_ip method.
*
* MT safe.
*/
void
gst_base_transform_set_passthrough (GstBaseTransform * trans,
gboolean passthrough)
{
GstBaseTransformClass *bclass;
g_return_if_fail (trans != NULL);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_LOCK (trans);
if (passthrough == FALSE) {
if (bclass->transform_ip || bclass->transform)
trans->passthrough = FALSE;
} else {
trans->passthrough = TRUE;
}
GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->passthrough);
GST_UNLOCK (trans);
}
/**
* gst_base_transform_is_passthrough:
* @trans: the #GstBaseTransform to query
*
* See if @trans is configured as a passthrough transform.
*
* Returns: TRUE is the transform is configured in passthrough mode.
*
* MT safe.
*/
gboolean
gst_base_transform_is_passthrough (GstBaseTransform * trans)
{
gboolean result;
g_return_val_if_fail (trans != NULL, FALSE);
GST_LOCK (trans);
result = trans->passthrough;
GST_UNLOCK (trans);
return result;
}
/**
* gst_base_transform_set_in_place:
* @trans: the #GstBaseTransform to modify
* @in_place: Boolean value indicating that we would like to operate
* on in_place buffers.
*
* Determines whether a non-writable buffer will be copied before passing
* to the transform_ip function.
* <itemizedlist>
* <listitem>Always TRUE if no transform function is implemented.</listitem>
* <listitem>Always FALSE if ONLY transform_ip function is implemented.</listitem>
* </itemizedlist>
*
* MT safe.
*/
void
gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
{
GstBaseTransformClass *bclass;
g_return_if_fail (trans != NULL);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_LOCK (trans);
if (in_place) {
if (bclass->transform_ip) {
GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
trans->always_in_place = TRUE;
}
} else {
if (bclass->transform) {
GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
trans->always_in_place = FALSE;
}
}
GST_UNLOCK (trans);
}
/**
* gst_base_transform_is_in_place:
* @trans: the #GstBaseTransform to query
*
* See if @trans is configured as a in_place transform.
*
* Returns: TRUE is the transform is configured in in_place mode.
*
* MT safe.
*/
gboolean
gst_base_transform_is_in_place (GstBaseTransform * trans)
{
gboolean result;
g_return_val_if_fail (trans != NULL, FALSE);
GST_LOCK (trans);
result = trans->always_in_place;
GST_UNLOCK (trans);
return result;
}
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