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gstreamer/libs/gst/base/gstbasetransform.c
Wim Taymans 37318a8cd2 pad: remove GstPadFixateCapsFunction 
The fixate caps function was not used externally and we have vmethods in the
base classes where it is needed.
Update some docs.
simplify some fixate functions in the base classes. Also pass the untruncated
caps to the vmethod.
2011-11-10 10:58:42 +01:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2005 Wim Taymans <wim@fluendo.com>
* 2005 Andy Wingo <wingo@fluendo.com>
* 2005 Thomas Vander Stichele <thomas at apestaart dot org>
* 2008 Wim Taymans <wim.taymans@gmail.com>
*
* 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 transform 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>
*
* <refsect2>
* <title>Use Cases</title>
* <para>
* <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>
* </para>
* </refsect2>
* <refsect2>
* <title>Sub-class settable flags on GstBaseTransform</title>
* <para>
* <itemizedlist>
* <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>
* </para>
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "../../../gst/gst_private.h"
#include "../../../gst/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
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_PROP_QOS FALSE
enum
{
PROP_0,
PROP_QOS
};
#define GST_BASE_TRANSFORM_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_TRANSFORM, GstBaseTransformPrivate))
struct _GstBaseTransformPrivate
{
/* QoS *//* with LOCK */
gboolean qos_enabled;
gdouble proportion;
GstClockTime earliest_time;
/* previous buffer had a discont */
gboolean discont;
GstPadActivateMode pad_mode;
gboolean gap_aware;
gboolean reconfigure;
/* QoS stats */
guint64 processed;
guint64 dropped;
GstClockTime position_out;
GstBufferPool *pool;
const GstAllocator *allocator;
guint prefix;
guint alignment;
};
static GstElementClass *parent_class = NULL;
static void gst_base_transform_class_init (GstBaseTransformClass * klass);
static void gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * klass);
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_base_transform_get_type (void)
{
static volatile gsize base_transform_type = 0;
if (g_once_init_enter (&base_transform_type)) {
GType _type;
static const GTypeInfo base_transform_info = {
sizeof (GstBaseTransformClass),
NULL,
NULL,
(GClassInitFunc) gst_base_transform_class_init,
NULL,
NULL,
sizeof (GstBaseTransform),
0,
(GInstanceInitFunc) gst_base_transform_init,
};
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&base_transform_type, _type);
}
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_activate (GstBaseTransform * trans,
gboolean active);
static gboolean gst_base_transform_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static gboolean gst_base_transform_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_base_transform_src_eventfunc (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_base_transform_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_base_transform_sink_eventfunc (GstBaseTransform * trans,
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 void gst_base_transform_default_fixate (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstCaps *gst_base_transform_getcaps (GstPad * pad, GstCaps * filter);
static gboolean gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_base_transform_setcaps (GstBaseTransform * trans,
GstPad * pad, GstCaps * caps);
static gboolean gst_base_transform_query (GstPad * pad, GstQuery * query);
static gboolean gst_base_transform_default_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query);
static GstFlowReturn default_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf);
static gboolean default_copy_metadata (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_base_transform_finalize (GObject * object)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
g_mutex_free (trans->transform_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_transform_class_init (GstBaseTransformClass * klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
"basetransform element");
GST_DEBUG ("gst_base_transform_class_init");
g_type_class_add_private (klass, sizeof (GstBaseTransformPrivate));
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_base_transform_set_property;
gobject_class->get_property = gst_base_transform_get_property;
g_object_class_install_property (gobject_class, PROP_QOS,
g_param_spec_boolean ("qos", "QoS", "Handle Quality-of-Service events",
DEFAULT_PROP_QOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gobject_class->finalize = gst_base_transform_finalize;
klass->fixate_caps = GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate);
klass->passthrough_on_same_caps = FALSE;
klass->sink_event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
klass->accept_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
klass->prepare_output_buffer =
GST_DEBUG_FUNCPTR (default_prepare_output_buffer);
klass->copy_metadata = GST_DEBUG_FUNCPTR (default_copy_metadata);
klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
}
static void
gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * bclass)
{
GstPadTemplate *pad_template;
GST_DEBUG ("gst_base_transform_init");
trans->priv = GST_BASE_TRANSFORM_GET_PRIVATE (trans);
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_event_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_sink_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_query_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_query));
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_event_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_src_event));
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_pad_set_query_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_query));
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
trans->transform_lock = g_mutex_new ();
trans->priv->qos_enabled = DEFAULT_PROP_QOS;
trans->cache_caps1 = NULL;
trans->cache_caps2 = NULL;
trans->priv->pad_mode = GST_PAD_ACTIVATE_NONE;
trans->priv->gap_aware = FALSE;
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) {
GST_DEBUG_OBJECT (trans, "setting passthrough TRUE");
trans->passthrough = TRUE;
}
}
trans->priv->processed = 0;
trans->priv->dropped = 0;
}
/* given @caps on the src or sink pad (given by @direction)
* calculate the possible caps on the other pad.
*
* Returns new caps, unref after usage.
*/
static GstCaps *
gst_base_transform_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCaps *ret;
GstBaseTransformClass *klass;
if (caps == NULL)
return NULL;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* if there is a custom transform function, use this */
if (klass->transform_caps) {
GST_DEBUG_OBJECT (trans, "transform caps (direction = %d)", direction);
GST_LOG_OBJECT (trans, "from: %" GST_PTR_FORMAT, caps);
ret = klass->transform_caps (trans, direction, caps, filter);
GST_LOG_OBJECT (trans, " to: %" GST_PTR_FORMAT, ret);
#ifndef G_DISABLE_ASSERT
if (filter) {
if (!gst_caps_is_subset (ret, filter)) {
GstCaps *intersection;
GST_ERROR_OBJECT (trans,
"transform_caps returned caps %" GST_PTR_FORMAT
" which are not a real subset of the filter caps %"
GST_PTR_FORMAT, ret, filter);
g_warning ("%s: transform_caps returned caps which are not a real "
"subset of the filter caps", GST_ELEMENT_NAME (trans));
intersection =
gst_caps_intersect_full (filter, ret, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (intersection);
ret = intersection;
}
}
#endif
} else {
GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
/* no transform function, use the identity transform */
if (filter) {
ret = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
} else {
ret = gst_caps_ref (caps);
}
}
GST_DEBUG_OBJECT (trans, "to: (%d) %" GST_PTR_FORMAT, gst_caps_get_size (ret),
ret);
return ret;
}
/* transform a buffer of @size with @caps on the pad with @direction to
* the size of a buffer with @othercaps and store the result in @othersize
*
* We have two ways of doing this:
* 1) use a custom transform size function, this is for complicated custom
* cases with no fixed unit_size.
* 2) use the unit_size functions where there is a relationship between the
* caps and the size of a buffer.
*/
static gboolean
gst_base_transform_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps,
gsize size, GstCaps * othercaps, gsize * othersize)
{
gsize inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
gboolean ret;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans,
"asked to transform size %" G_GSIZE_FORMAT " 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 (klass->transform_size) {
/* if there is a custom transform function, use this */
ret = klass->transform_size (trans, direction, caps, size, othercaps,
othersize);
} else if (klass->get_unit_size == NULL) {
/* if there is no transform_size and no unit_size, it means the
* element does not modify the size of a buffer */
*othersize = size;
ret = TRUE;
} else {
/* there is no transform_size function, we have to use the unit_size
* functions. This method assumes there is a fixed unit_size associated with
* each caps. We provide the same amount of units on both sides. */
if (!gst_base_transform_get_unit_size (trans, caps, &inunitsize))
goto no_in_size;
GST_DEBUG_OBJECT (trans,
"input size %" G_GSIZE_FORMAT ", input unit size %" G_GSIZE_FORMAT,
size, inunitsize);
/* input size must be a multiple of the unit_size of the input caps */
if (inunitsize == 0 || (size % inunitsize != 0))
goto no_multiple;
/* get the amount of units */
units = size / inunitsize;
/* now get the unit size of the output */
if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
goto no_out_size;
/* the output size is the unit_size times the amount of units on the
* input */
*othersize = units * outunitsize;
GST_DEBUG_OBJECT (trans, "transformed size to %" G_GSIZE_FORMAT,
*othersize);
ret = TRUE;
}
return ret;
/* ERRORS */
no_in_size:
{
GST_DEBUG_OBJECT (trans, "could not get in_size");
g_warning ("%s: could not get in_size", GST_ELEMENT_NAME (trans));
return FALSE;
}
no_multiple:
{
GST_DEBUG_OBJECT (trans, "Size %" G_GSIZE_FORMAT " is not a multiple of"
"unit size %" G_GSIZE_FORMAT, size, inunitsize);
g_warning ("%s: size %" G_GSIZE_FORMAT " is not a multiple of unit size %"
G_GSIZE_FORMAT, GST_ELEMENT_NAME (trans), size, inunitsize);
return FALSE;
}
no_out_size:
{
GST_DEBUG_OBJECT (trans, "could not get out_size");
g_warning ("%s: could not get out_size", GST_ELEMENT_NAME (trans));
return FALSE;
}
}
/* get the caps that can be handled by @pad. We perform:
*
* - take the caps of peer of otherpad,
* - filter against the padtemplate of otherpad,
* - calculate all transforms of remaining caps
* - filter against template of @pad
*
* If there is no peer, we simply return the caps of the padtemplate of pad.
*/
static GstCaps *
gst_base_transform_getcaps (GstPad * pad, GstCaps * filter)
{
GstBaseTransform *trans;
GstPad *otherpad;
GstCaps *peercaps, *caps, *temp, *peerfilter = NULL;
GstCaps *templ;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
/* we can do what the peer can */
if (filter) {
GST_DEBUG_OBJECT (pad, "filter caps %" GST_PTR_FORMAT, filter);
/* filtered against our padtemplate on the other side */
templ = gst_pad_get_pad_template_caps (pad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
temp = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (templ);
/* then see what we can transform this to */
peerfilter = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (pad), temp, NULL);
GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, peerfilter);
gst_caps_unref (temp);
/* and filter against the template of this pad */
templ = gst_pad_get_pad_template_caps (otherpad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
/* We keep the caps sorted like the returned caps */
temp =
gst_caps_intersect_full (peerfilter, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (peerfilter);
gst_caps_unref (templ);
peerfilter = temp;
}
peercaps = gst_pad_peer_get_caps (otherpad, peerfilter);
if (peerfilter)
gst_caps_unref (peerfilter);
if (peercaps) {
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peercaps);
/* filtered against our padtemplate on the other side */
templ = gst_pad_get_pad_template_caps (otherpad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
temp = gst_caps_intersect_full (peercaps, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (templ);
} else {
temp = gst_caps_copy (gst_pad_get_pad_template_caps (otherpad));
}
/* then see what we can transform this to */
caps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (otherpad), temp, filter);
GST_DEBUG_OBJECT (pad, "transformed %" GST_PTR_FORMAT, caps);
gst_caps_unref (temp);
if (caps == NULL)
goto done;
if (peercaps) {
/* and filter against the template of this pad */
templ = gst_pad_get_pad_template_caps (pad);
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, templ);
/* We keep the caps sorted like the returned caps */
temp = gst_caps_intersect_full (caps, templ, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (caps);
gst_caps_unref (templ);
caps = temp;
/* Now try if we can put the untransformed downstream caps first */
temp = gst_caps_intersect_full (peercaps, caps, GST_CAPS_INTERSECT_FIRST);
if (!gst_caps_is_empty (temp)) {
gst_caps_merge (temp, caps);
caps = temp;
} else {
gst_caps_unref (temp);
}
} else {
gst_caps_unref (caps);
/* no peer or the peer can do anything, our padtemplate is enough then */
caps = gst_pad_get_pad_template_caps (pad);
if (filter) {
GstCaps *temp;
temp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = temp;
}
}
done:
GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
if (peercaps)
gst_caps_unref (peercaps);
gst_object_unref (trans);
return caps;
}
static gboolean
gst_base_transform_set_allocation (GstBaseTransform * trans,
GstBufferPool * pool, const GstAllocator * allocator, guint prefix,
guint alignment)
{
GstBufferPool *oldpool;
GstBaseTransformPrivate *priv = trans->priv;
/* activate */
if (pool) {
GST_DEBUG_OBJECT (trans, "setting pool %p active", pool);
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
}
GST_OBJECT_LOCK (trans);
oldpool = priv->pool;
priv->pool = pool;
priv->allocator = allocator;
priv->prefix = prefix;
priv->alignment = alignment;
GST_OBJECT_UNLOCK (trans);
if (oldpool) {
GST_DEBUG_OBJECT (trans, "deactivating old pool %p", oldpool);
gst_buffer_pool_set_active (oldpool, FALSE);
gst_object_unref (oldpool);
}
return TRUE;
/* ERRORS */
activate_failed:
{
GST_ERROR_OBJECT (trans, "failed to activate bufferpool.");
return FALSE;
}
}
static gboolean
gst_base_transform_do_bufferpool (GstBaseTransform * trans, GstCaps * outcaps)
{
GstQuery *query;
gboolean result = TRUE;
GstBufferPool *pool = NULL, *oldpool;
guint size, min, max, prefix, alignment;
GstBaseTransformClass *klass;
const GstAllocator *allocator = NULL;
/* there are these possibilities:
*
* 1) we negotiated passthrough, we can proxy the bufferpool directly and we
* will do that whenever some upstream does an allocation query.
* 2) we need to do a transform, we need to get a bufferpool from downstream
* and configure it. When upstream does the ALLOCATION query, the
* propose_allocation vmethod will be called and we will configure the
* upstream allocator with our porposed values then.
*/
/* clear old pool */
oldpool = trans->priv->pool;
if (oldpool) {
GST_DEBUG_OBJECT (trans, "unreffing old pool");
gst_buffer_pool_set_active (oldpool, FALSE);
gst_object_unref (oldpool);
trans->priv->pool = oldpool = NULL;
}
if (trans->passthrough || trans->always_in_place) {
/* we are in passthrough, the input buffer is never copied and always passed
* along. We never allocate an output buffer on the srcpad. What we do is
* let the upstream element decide if it wants to use a bufferpool and
* then we will proxy the downstream pool */
GST_DEBUG_OBJECT (trans, "we're passthough, delay bufferpool");
return TRUE;
}
/* not passthrough, we need to allocate */
/* find a pool for the negotiated caps now */
GST_DEBUG_OBJECT (trans, "doing allocation query");
query = gst_query_new_allocation (outcaps, TRUE);
if (!gst_pad_peer_query (trans->srcpad, query)) {
/* not a problem, just debug a little */
GST_DEBUG_OBJECT (trans, "peer ALLOCATION query failed");
}
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans, "calling decide_allocation");
if (G_LIKELY (klass->decide_allocation))
result = klass->decide_allocation (trans, query);
/* we got configuration from our peer, parse them */
gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
&alignment, &pool);
if (size == 0) {
const gchar *mem = NULL;
/* no size, we have variable size buffers */
if (gst_query_get_n_allocation_memories (query) > 0) {
mem = gst_query_parse_nth_allocation_memory (query, 0);
}
allocator = gst_allocator_find (mem);
GST_DEBUG_OBJECT (trans, "no size, using allocator %s", GST_STR_NULL (mem));
} else if (pool == NULL) {
GstStructure *config;
/* we did not get a pool, make one ourselves then */
pool = gst_buffer_pool_new ();
GST_DEBUG_OBJECT (trans, "no pool, making one");
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set (config, outcaps, size, min, max, prefix,
alignment);
gst_buffer_pool_set_config (pool, config);
}
gst_query_unref (query);
/* and store */
result =
gst_base_transform_set_allocation (trans, pool, allocator, prefix,
alignment);
return result;
}
/* function triggered when the in and out caps are negotiated and need
* to be configured in the subclass. */
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);
GST_DEBUG_OBJECT (trans, "in caps: %" GST_PTR_FORMAT, in);
GST_DEBUG_OBJECT (trans, "out caps: %" GST_PTR_FORMAT, out);
/* clear the cache */
gst_caps_replace (&trans->cache_caps1, NULL);
gst_caps_replace (&trans->cache_caps2, NULL);
/* figure out same caps state */
trans->have_same_caps = gst_caps_is_equal (in, out);
GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
/* 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 void
gst_base_transform_default_fixate (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
GST_DEBUG_OBJECT (trans, "using default caps fixate function");
gst_caps_fixate (othercaps);
}
/* given a fixed @caps on @pad, create the best possible caps for the
* other pad.
* @caps must be fixed when calling this function.
*
* This function calls the transform caps vmethod of the basetransform to figure
* out the possible target formats. It then tries to select the best format from
* this list by:
*
* - attempt passthrough if the target caps is a superset of the input caps
* - fixating by using peer caps
* - fixating with transform fixate function
* - fixating with pad fixate functions.
*
* this function returns a caps that can be transformed into and is accepted by
* the peer element.
*/
static GstCaps *
gst_base_transform_find_transform (GstBaseTransform * trans, GstPad * pad,
GstCaps * caps)
{
GstBaseTransformClass *klass;
GstPad *otherpad, *otherpeer;
GstCaps *othercaps;
gboolean is_fixed;
/* caps must be fixed here, this is a programming error if it's not */
g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
/* see how we can transform the input caps. We need to do this even for
* passthrough because it might be possible that this element cannot support
* passthrough at all. */
othercaps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (pad), caps, NULL);
/* The caps we can actually output is the intersection of the transformed
* caps with the pad template for the pad */
if (othercaps) {
GstCaps *intersect, *templ_caps;
templ_caps = gst_pad_get_pad_template_caps (otherpad);
GST_DEBUG_OBJECT (trans,
"intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
intersect =
gst_caps_intersect_full (othercaps, templ_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (othercaps);
gst_caps_unref (templ_caps);
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. */
/* FIXME. maybe the caps is not fixed because it has multiple structures of
* fixed caps */
is_fixed = gst_caps_is_fixed (othercaps);
if (!is_fixed) {
GST_DEBUG_OBJECT (trans,
"transform returned non fixed %" GST_PTR_FORMAT, othercaps);
/* Now let's see what the peer suggests based on our transformed caps */
if (otherpeer) {
GstCaps *peercaps, *intersection, *templ_caps;
GST_DEBUG_OBJECT (trans,
"Checking peer caps with filter %" GST_PTR_FORMAT, othercaps);
peercaps = gst_pad_get_caps (otherpeer, othercaps);
GST_DEBUG_OBJECT (trans, "Resulted in %" GST_PTR_FORMAT, peercaps);
templ_caps = gst_pad_get_pad_template_caps (otherpad);
GST_DEBUG_OBJECT (trans,
"Intersecting with template caps %" GST_PTR_FORMAT, templ_caps);
intersection =
gst_caps_intersect_full (peercaps, templ_caps,
GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT, intersection);
gst_caps_unref (peercaps);
gst_caps_unref (templ_caps);
peercaps = intersection;
GST_DEBUG_OBJECT (trans,
"Intersecting with transformed caps %" GST_PTR_FORMAT, othercaps);
intersection =
gst_caps_intersect_full (peercaps, othercaps,
GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (trans, "Intersection: %" GST_PTR_FORMAT, intersection);
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersection;
is_fixed = gst_caps_is_fixed (othercaps);
} else {
GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
is_fixed = TRUE;
}
}
if (gst_caps_is_empty (othercaps))
goto no_transform_possible;
GST_DEBUG ("have %sfixed caps %" GST_PTR_FORMAT, (is_fixed ? "" : "non-"),
othercaps);
/* second attempt at fixation, call the fixate vmethod */
/* caps could be fixed but the subclass may want to add fields */
if (klass->fixate_caps) {
othercaps = gst_caps_make_writable (othercaps);
GST_DEBUG_OBJECT (trans, "calling faxate_caps for %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT " on pad %s:%s", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
/* note that we pass the complete array of structures to the fixate
* function, it needs to truncate itself */
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
is_fixed = gst_caps_is_fixed (othercaps);
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}
/* caps should be fixed now, if not we have to fail. */
if (!is_fixed)
goto could_not_fixate;
/* and peer should accept */
if (otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
goto peer_no_accept;
GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
if (otherpeer)
gst_object_unref (otherpeer);
return othercaps;
/* ERRORS */
no_transform:
{
GST_DEBUG_OBJECT (trans,
"transform returned useless %" GST_PTR_FORMAT, othercaps);
goto error_cleanup;
}
no_transform_possible:
{
GST_DEBUG_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
goto error_cleanup;
}
could_not_fixate:
{
GST_DEBUG_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
goto error_cleanup;
}
peer_no_accept:
{
GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
goto error_cleanup;
}
error_cleanup:
{
if (otherpeer)
gst_object_unref (otherpeer);
if (othercaps)
gst_caps_unref (othercaps);
return NULL;
}
}
static gboolean
gst_base_transform_acceptcaps_default (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
#if 0
GstPad *otherpad;
GstCaps *othercaps = NULL;
#endif
gboolean ret = TRUE;
#if 0
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
/* we need fixed caps for the check, fall back to the default implementation
* if we don't */
if (!gst_caps_is_fixed (caps))
#endif
{
GstCaps *allowed;
GST_DEBUG_OBJECT (trans, "non fixed accept caps %" GST_PTR_FORMAT, caps);
/* get all the formats we can handle on this pad */
if (direction == GST_PAD_SRC)
allowed = gst_pad_get_caps (trans->srcpad, NULL);
else
allowed = gst_pad_get_caps (trans->sinkpad, NULL);
if (!allowed) {
GST_DEBUG_OBJECT (trans, "gst_pad_get_caps() failed");
goto no_transform_possible;
}
GST_DEBUG_OBJECT (trans, "allowed caps %" GST_PTR_FORMAT, allowed);
/* intersect with the requested format */
ret = gst_caps_is_subset (caps, allowed);
gst_caps_unref (allowed);
if (!ret)
goto no_transform_possible;
}
#if 0
else {
GST_DEBUG_OBJECT (pad, "accept caps %" GST_PTR_FORMAT, caps);
/* find best possible caps for the other pad as a way to see if we can
* transform this caps. */
othercaps = gst_base_transform_find_transform (trans, pad, caps, FALSE);
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform_possible;
GST_DEBUG_OBJECT (pad, "we can transform to %" GST_PTR_FORMAT, othercaps);
}
#endif
done:
#if 0
/* We know it's always NULL since we never use it */
if (othercaps)
gst_caps_unref (othercaps);
#endif
return ret;
/* ERRORS */
no_transform_possible:
{
GST_DEBUG_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
ret = FALSE;
goto done;
}
}
/* called when new caps arrive on the sink or source pad,
* We try to find the best caps for the other side using our _find_transform()
* function. If there are caps, we configure the transform for this new
* transformation.
*
* FIXME, this function is currently commutative but this should not really be
* because we never set caps starting from the srcpad.
*/
static gboolean
gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
GstCaps * caps)
{
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
GstCaps *incaps, *outcaps;
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, caps, caps);
/* find best possible caps for the other pad */
othercaps = gst_base_transform_find_transform (trans, pad, caps);
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform_possible;
/* configure the element now */
/* make sure in and out caps are correct */
if (pad == trans->sinkpad) {
incaps = caps;
outcaps = othercaps;
} else {
incaps = othercaps;
outcaps = caps;
}
/* if we have the same caps, we can optimize and reuse the input caps */
if (gst_caps_is_equal (incaps, outcaps)) {
GST_INFO_OBJECT (trans, "reuse caps");
gst_caps_unref (othercaps);
outcaps = othercaps = gst_caps_ref (incaps);
}
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
GST_OBJECT_LOCK (trans->sinkpad);
GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_NEED_RECONFIGURE);
trans->priv->reconfigure = FALSE;
GST_OBJECT_UNLOCK (trans->sinkpad);
/* we know this will work, we implement the setcaps */
gst_pad_push_event (otherpad, gst_event_new_caps (othercaps));
if (pad == trans->srcpad && trans->priv->pad_mode == GST_PAD_ACTIVATE_PULL) {
/* FIXME hm? */
ret &= gst_pad_push_event (otherpeer, gst_event_new_caps (othercaps));
if (!ret) {
GST_INFO_OBJECT (trans, "otherpeer setcaps(%" GST_PTR_FORMAT ") failed",
othercaps);
}
}
if (ret) {
/* try to get a pool when needed */
ret = gst_base_transform_do_bufferpool (trans, othercaps);
}
done:
if (otherpeer)
gst_object_unref (otherpeer);
if (othercaps)
gst_caps_unref (othercaps);
trans->negotiated = ret;
return ret;
/* ERRORS */
no_transform_possible:
{
GST_WARNING_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
ret = FALSE;
goto done;
}
failed_configure:
{
GST_WARNING_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
}
static gboolean
gst_base_transform_default_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query)
{
gboolean ret = FALSE;
GstPad *otherpad;
GstBaseTransformClass *klass;
otherpad = (direction == GST_PAD_SRC) ? trans->sinkpad : trans->srcpad;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
{
gboolean passthrough;
/* can only be done on the sinkpad */
if (direction != GST_PAD_SINK)
goto done;
GST_BASE_TRANSFORM_LOCK (trans);
passthrough = trans->passthrough || trans->always_in_place;
GST_BASE_TRANSFORM_UNLOCK (trans);
if (passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough query");
ret = gst_pad_peer_query (otherpad, query);
} else {
GST_DEBUG_OBJECT (trans, "propose allocation values");
/* pass the query to the propose_allocation vmethod if any */
if (G_LIKELY (klass->propose_allocation))
ret = klass->propose_allocation (trans, query);
else
ret = FALSE;
}
GST_DEBUG_OBJECT (trans, "ALLOCATION ret %d, %" GST_PTR_FORMAT, ret,
query);
break;
}
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
if (format == GST_FORMAT_TIME && trans->segment.format == GST_FORMAT_TIME) {
gint64 pos;
ret = TRUE;
if ((direction == GST_PAD_SINK)
|| (trans->priv->position_out == GST_CLOCK_TIME_NONE)) {
pos =
gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
trans->segment.position);
} else {
pos = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
trans->priv->position_out);
}
gst_query_set_position (query, format, pos);
} else {
ret = gst_pad_peer_query (otherpad, query);
}
break;
}
case GST_QUERY_ACCEPT_CAPS:
{
GstCaps *caps;
gst_query_parse_accept_caps (query, &caps);
if (klass->accept_caps) {
ret = klass->accept_caps (trans, direction, caps);
gst_query_set_accept_caps_result (query, ret);
/* return TRUE, we answered the query */
ret = TRUE;
}
break;
}
default:
ret = gst_pad_peer_query (otherpad, query);
break;
}
done:
return ret;
}
static gboolean
gst_base_transform_query (GstPad * pad, GstQuery * query)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL))
return FALSE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->query)
ret = bclass->query (trans, GST_PAD_DIRECTION (pad), query);
else
ret = gst_pad_query_default (pad, query);
gst_object_unref (trans);
return ret;
}
/* this function either returns the input buffer without incrementing the
* refcount or it allocates a new (writable) buffer */
static GstFlowReturn
default_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf)
{
GstBaseTransformPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
GstBaseTransformClass *bclass;
priv = trans->priv;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* figure out how to allocate an output buffer */
if (trans->passthrough) {
/* passthrough, we will not modify the incomming buffer so we can just
* reuse it */
GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
*outbuf = inbuf;
} else {
/* we can't reuse the input buffer */
if (priv->pool) {
GST_DEBUG_OBJECT (trans, "using pool alloc");
ret = gst_buffer_pool_acquire_buffer (priv->pool, outbuf, NULL);
} else {
gsize insize, outsize;
gboolean res;
/* no pool, we need to figure out the size of the output buffer first */
insize = gst_buffer_get_size (inbuf);
if (trans->passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
/* passthrough, the output size is the same as the input size. */
outsize = insize;
} else {
gboolean want_in_place = (bclass->transform_ip != NULL)
&& trans->always_in_place;
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace alloc");
/* we alloc a buffer of the same size as the input */
outsize = insize;
} else {
GstCaps *incaps, *outcaps;
/* else use the transform function to get the size */
incaps = gst_pad_get_current_caps (trans->sinkpad);
outcaps = gst_pad_get_current_caps (trans->srcpad);
GST_DEBUG_OBJECT (trans, "getting output size for alloc");
/* copy transform, figure out the output size */
res = gst_base_transform_transform_size (trans,
GST_PAD_SINK, incaps, insize, outcaps, &outsize);
gst_caps_unref (incaps);
gst_caps_unref (outcaps);
if (!res)
goto unknown_size;
}
}
GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
*outbuf =
gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
}
}
return ret;
/* ERRORS */
unknown_size:
{
GST_ERROR_OBJECT (trans, "unknown output size");
return GST_FLOW_ERROR;
}
}
static gboolean
default_copy_metadata (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf)
{
GstBaseTransformPrivate *priv = trans->priv;
/* now copy the metadata */
GST_DEBUG_OBJECT (trans, "copying metadata");
/* this should not happen, buffers allocated from a pool or with
* new_allocate should always be writable. */
if (!gst_buffer_is_writable (outbuf))
goto not_writable;
/* when we get here, the metadata should be writable */
gst_buffer_copy_into (outbuf, inbuf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* clear the GAP flag when the subclass does not understand it */
if (!priv->gap_aware)
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP);
return TRUE;
/* ERRORS */
not_writable:
{
GST_WARNING_OBJECT (trans, "buffer %p not writable", outbuf);
return FALSE;
}
}
/* Given @caps calcultate the size of one unit.
*
* For video caps, this is the size of one frame (and thus one buffer).
* For audio caps, this is the size of one sample.
*
* These values are cached since they do not change and the calculation
* potentially involves parsing caps and other expensive stuff.
*
* We have two cache locations to store the size, one for the source caps
* and one for the sink caps.
*
* this function returns FALSE if no size could be calculated.
*/
static gboolean
gst_base_transform_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
gsize * 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,
"returned %" G_GSIZE_FORMAT " from first cache", *size);
return TRUE;
}
if (trans->cache_caps2 == caps) {
*size = trans->cache_caps2_size;
GST_DEBUG_OBJECT (trans,
"returned %" G_GSIZE_FORMAT " from second cached", *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 %" G_GSIZE_FORMAT ", res %s",
caps, *size, res ? "TRUE" : "FALSE");
if (res) {
/* and cache the values */
if (trans->cache_caps1 == NULL) {
gst_caps_replace (&trans->cache_caps1, caps);
trans->cache_caps1_size = *size;
GST_DEBUG_OBJECT (trans,
"caching %" G_GSIZE_FORMAT " in first cache", *size);
} else if (trans->cache_caps2 == NULL) {
gst_caps_replace (&trans->cache_caps2, caps);
trans->cache_caps2_size = *size;
GST_DEBUG_OBJECT (trans,
"caching %" G_GSIZE_FORMAT " in second cache", *size);
} else {
GST_DEBUG_OBJECT (trans, "no free spot to cache unit_size");
}
}
} else {
GST_DEBUG_OBJECT (trans, "Sub-class does not implement get_unit_size");
}
return res;
}
static gboolean
gst_base_transform_sink_event (GstPad * pad, GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL)) {
gst_event_unref (event);
return FALSE;
}
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->sink_event)
ret = bclass->sink_event (trans, event);
else
gst_event_unref (event);
gst_object_unref (trans);
return ret;
}
static gboolean
gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
{
gboolean ret = TRUE, forward = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
break;
case GST_EVENT_FLUSH_STOP:
GST_OBJECT_LOCK (trans);
/* reset QoS parameters */
trans->priv->proportion = 1.0;
trans->priv->earliest_time = -1;
trans->priv->discont = FALSE;
trans->priv->processed = 0;
trans->priv->dropped = 0;
GST_OBJECT_UNLOCK (trans);
/* we need new segment info after the flush. */
trans->have_segment = FALSE;
gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
trans->priv->position_out = GST_CLOCK_TIME_NONE;
break;
case GST_EVENT_EOS:
break;
case GST_EVENT_TAG:
break;
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_base_transform_setcaps (trans, trans->sinkpad, caps);
forward = FALSE;
break;
}
case GST_EVENT_SEGMENT:
{
gst_event_copy_segment (event, &trans->segment);
trans->have_segment = TRUE;
GST_DEBUG_OBJECT (trans, "received SEGMENT %" GST_SEGMENT_FORMAT,
&trans->segment);
break;
}
default:
break;
}
if (ret && forward)
ret = gst_pad_push_event (trans->srcpad, event);
else
gst_event_unref (event);
return ret;
}
static gboolean
gst_base_transform_src_event (GstPad * pad, GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL)) {
gst_event_unref (event);
return FALSE;
}
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->src_event)
ret = bclass->src_event (trans, event);
else
gst_event_unref (event);
gst_object_unref (trans);
return ret;
}
static gboolean
gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
{
gboolean ret;
GST_DEBUG_OBJECT (trans, "handling event %p %" GST_PTR_FORMAT, event, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
break;
case GST_EVENT_NAVIGATION:
break;
case GST_EVENT_QOS:
{
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, NULL, &proportion, &diff, &timestamp);
gst_base_transform_update_qos (trans, proportion, diff, timestamp);
break;
}
default:
break;
}
ret = gst_pad_push_event (trans->sinkpad, event);
return ret;
}
/* perform a transform on @inbuf and put the result in @outbuf.
*
* This function is common to the push and pull-based operations.
*
* This function takes ownership of @inbuf */
static GstFlowReturn
gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer ** outbuf)
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
gboolean want_in_place;
GstClockTime running_time;
GstClockTime timestamp;
gboolean reconfigure;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_OBJECT_LOCK (trans->sinkpad);
reconfigure = GST_PAD_NEEDS_RECONFIGURE (trans->srcpad)
|| trans->priv->reconfigure;
GST_OBJECT_FLAG_UNSET (trans->srcpad, GST_PAD_NEED_RECONFIGURE);
trans->priv->reconfigure = FALSE;
GST_OBJECT_UNLOCK (trans->sinkpad);
if (G_UNLIKELY (reconfigure)) {
GstCaps *incaps;
GST_DEBUG_OBJECT (trans, "we had a pending reconfigure");
incaps = gst_pad_get_current_caps (trans->sinkpad);
if (incaps == NULL)
goto no_reconfigure;
/* if we need to reconfigure we pretend a buffer with new caps arrived. This
* will reconfigure the transform with the new output format. We can only
* do this if the buffer actually has caps. */
if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps)) {
gst_caps_unref (incaps);
goto not_negotiated;
}
gst_caps_unref (incaps);
}
no_reconfigure:
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
GST_DEBUG_OBJECT (trans,
"handling buffer %p of size %" G_GSIZE_FORMAT " and offset %"
G_GUINT64_FORMAT, inbuf, gst_buffer_get_size (inbuf),
GST_BUFFER_OFFSET (inbuf));
else
GST_DEBUG_OBJECT (trans,
"handling buffer %p of size %" G_GSIZE_FORMAT " and offset NONE", inbuf,
gst_buffer_get_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;
/* Set discont flag so we can mark the outgoing buffer */
if (GST_BUFFER_IS_DISCONT (inbuf)) {
GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
trans->priv->discont = TRUE;
}
/* can only do QoS if the segment is in TIME */
if (trans->segment.format != GST_FORMAT_TIME)
goto no_qos;
/* QOS is done on the running time of the buffer, get it now */
timestamp = GST_BUFFER_TIMESTAMP (inbuf);
running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
timestamp);
if (running_time != -1) {
gboolean need_skip;
GstClockTime earliest_time;
gdouble proportion;
/* lock for getting the QoS parameters that are set (in a different thread)
* with the QOS events */
GST_OBJECT_LOCK (trans);
earliest_time = trans->priv->earliest_time;
proportion = trans->priv->proportion;
/* check for QoS, don't perform conversion for buffers
* that are known to be late. */
need_skip = trans->priv->qos_enabled &&
earliest_time != -1 && running_time <= earliest_time;
GST_OBJECT_UNLOCK (trans);
if (need_skip) {
GstMessage *qos_msg;
GstClockTime duration;
guint64 stream_time;
gint64 jitter;
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time), GST_TIME_ARGS (earliest_time));
trans->priv->dropped++;
duration = GST_BUFFER_DURATION (inbuf);
stream_time =
gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
timestamp);
jitter = GST_CLOCK_DIFF (running_time, earliest_time);
qos_msg =
gst_message_new_qos (GST_OBJECT_CAST (trans), FALSE, running_time,
stream_time, timestamp, duration);
gst_message_set_qos_values (qos_msg, jitter, proportion, 1000000);
gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
trans->priv->processed, trans->priv->dropped);
gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
/* mark discont for next buffer */
trans->priv->discont = TRUE;
goto skip;
}
}
no_qos:
/* first try to allocate an output buffer based on the currently negotiated
* format. outbuf will contain a buffer suitable for doing the configured
* transform after this function. */
if (bclass->prepare_output_buffer == NULL)
goto no_prepare;
GST_DEBUG_OBJECT (trans, "calling prepare buffer");
ret = bclass->prepare_output_buffer (trans, inbuf, outbuf);
if (ret != GST_FLOW_OK || *outbuf == NULL)
goto no_buffer;
if (inbuf == *outbuf) {
GST_DEBUG_OBJECT (trans, "reusing input buffer");
} else if (trans->passthrough) {
/* we are asked to perform a passthrough transform but the input and
* output buffers are different. We have to discard the output buffer and
* reuse the input buffer. This is rather weird, it means that the prepare
* output buffer does something wrong. */
GST_WARNING_OBJECT (trans, "passthrough but different buffers, check the "
"prepare_output_buffer implementation");
gst_buffer_unref (*outbuf);
*outbuf = inbuf;
} else {
/* copy the metadata */
if (bclass->copy_metadata)
if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (trans, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
}
GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", inbuf,
*outbuf);
/* now perform the needed transform */
if (trans->passthrough) {
/* In passthrough mode, give transform_ip a look at the
* buffer, without making it writable, or just push the
* data through */
if (bclass->transform_ip) {
GST_DEBUG_OBJECT (trans, "doing passthrough transform");
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_DEBUG_OBJECT (trans, "element is in passthrough");
}
} else {
want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace transform");
if (inbuf != *outbuf) {
guint8 *indata, *outdata;
gsize insize, outsize;
/* Different buffer. The data can still be the same when we are dealing
* with subbuffers of the same buffer. Note that because of the FIXME in
* prepare_output_buffer() we have decreased the refcounts of inbuf and
* outbuf to keep them writable */
indata = gst_buffer_map (inbuf, &insize, NULL, GST_MAP_READ);
outdata = gst_buffer_map (*outbuf, &outsize, NULL, GST_MAP_WRITE);
if (indata != outdata)
memcpy (outdata, indata, insize);
gst_buffer_unmap (inbuf, indata, insize);
gst_buffer_unmap (*outbuf, outdata, outsize);
}
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_DEBUG_OBJECT (trans, "doing non-inplace transform");
if (bclass->transform)
ret = bclass->transform (trans, inbuf, *outbuf);
else
ret = GST_FLOW_NOT_SUPPORTED;
}
}
skip:
/* only unref input buffer if we allocated a new outbuf buffer. If we reused
* the input buffer, no refcount is changed to keep the input buffer writable
* when needed. */
if (*outbuf != inbuf)
gst_buffer_unref (inbuf);
return ret;
/* ERRORS */
not_negotiated:
{
gst_buffer_unref (inbuf);
*outbuf = NULL;
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("not negotiated"), ("not negotiated"));
return GST_FLOW_NOT_NEGOTIATED;
}
no_prepare:
{
gst_buffer_unref (inbuf);
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("Sub-class has no prepare_output_buffer implementation"), (NULL));
return GST_FLOW_NOT_SUPPORTED;
}
no_buffer:
{
gst_buffer_unref (inbuf);
*outbuf = NULL;
GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
gst_flow_get_name (ret));
return ret;
}
}
/* 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;
GstBaseTransformClass *klass;
GstFlowReturn ret;
GstBuffer *inbuf;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pull_error;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (klass->before_transform)
klass->before_transform (trans, inbuf);
GST_BASE_TRANSFORM_LOCK (trans);
ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
GST_BASE_TRANSFORM_UNLOCK (trans);
done:
gst_object_unref (trans);
return ret;
/* ERRORS */
pull_error:
{
GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
gst_flow_get_name (ret));
goto done;
}
}
static GstFlowReturn
gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
{
GstBaseTransform *trans;
GstBaseTransformClass *klass;
GstFlowReturn ret;
GstClockTime position = GST_CLOCK_TIME_NONE;
GstClockTime timestamp, duration;
GstBuffer *outbuf = NULL;
trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
/* calculate end position of the incoming buffer */
if (timestamp != GST_CLOCK_TIME_NONE) {
if (duration != GST_CLOCK_TIME_NONE)
position = timestamp + duration;
else
position = timestamp;
}
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (klass->before_transform)
klass->before_transform (trans, buffer);
/* protect transform method and concurrent buffer alloc */
GST_BASE_TRANSFORM_LOCK (trans);
ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
GST_BASE_TRANSFORM_UNLOCK (trans);
/* outbuf can be NULL, this means a dropped buffer, if we have a buffer but
* GST_BASE_TRANSFORM_FLOW_DROPPED we will not push either. */
if (outbuf != NULL) {
if (ret == GST_FLOW_OK) {
GstClockTime position_out = GST_CLOCK_TIME_NONE;
/* Remember last stop position */
if (position != GST_CLOCK_TIME_NONE &&
trans->segment.format == GST_FORMAT_TIME)
trans->segment.position = position;
if (GST_BUFFER_TIMESTAMP_IS_VALID (outbuf)) {
position_out = GST_BUFFER_TIMESTAMP (outbuf);
if (GST_BUFFER_DURATION_IS_VALID (outbuf))
position_out += GST_BUFFER_DURATION (outbuf);
} else if (position != GST_CLOCK_TIME_NONE) {
position_out = position;
}
if (position_out != GST_CLOCK_TIME_NONE
&& trans->segment.format == GST_FORMAT_TIME)
trans->priv->position_out = position_out;
/* apply DISCONT flag if the buffer is not yet marked as such */
if (trans->priv->discont) {
if (!GST_BUFFER_IS_DISCONT (outbuf)) {
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
}
trans->priv->discont = FALSE;
}
trans->priv->processed++;
ret = gst_pad_push (trans->srcpad, outbuf);
} else {
gst_buffer_unref (outbuf);
}
}
/* convert internal flow to OK and mark discont for the next buffer. */
if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
trans->priv->discont = TRUE;
ret = GST_FLOW_OK;
}
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) {
case PROP_QOS:
gst_base_transform_set_qos_enabled (trans, g_value_get_boolean (value));
break;
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) {
case PROP_QOS:
g_value_set_boolean (value, gst_base_transform_is_qos_enabled (trans));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* not a vmethod of anything, just an internal method */
static gboolean
gst_base_transform_activate (GstBaseTransform * trans, gboolean active)
{
GstBaseTransformClass *bclass;
gboolean result = TRUE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (active) {
GstCaps *incaps, *outcaps;
if (trans->priv->pad_mode == GST_PAD_ACTIVATE_NONE && bclass->start)
result &= bclass->start (trans);
incaps = gst_pad_get_current_caps (trans->sinkpad);
outcaps = gst_pad_get_current_caps (trans->srcpad);
GST_OBJECT_LOCK (trans);
if (incaps && outcaps)
trans->have_same_caps =
gst_caps_is_equal (incaps, outcaps) || trans->passthrough;
else
trans->have_same_caps = trans->passthrough;
GST_DEBUG_OBJECT (trans, "have_same_caps %d", trans->have_same_caps);
trans->negotiated = FALSE;
trans->have_segment = FALSE;
gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
trans->priv->position_out = GST_CLOCK_TIME_NONE;
trans->priv->proportion = 1.0;
trans->priv->earliest_time = -1;
trans->priv->discont = FALSE;
trans->priv->processed = 0;
trans->priv->dropped = 0;
GST_OBJECT_UNLOCK (trans);
if (incaps)
gst_caps_unref (incaps);
if (outcaps)
gst_caps_unref (outcaps);
} else {
/* We must make sure streaming has finished before resetting things
* and calling the ::stop vfunc */
GST_PAD_STREAM_LOCK (trans->sinkpad);
GST_PAD_STREAM_UNLOCK (trans->sinkpad);
trans->have_same_caps = FALSE;
/* We can only reset the passthrough mode if the instance told us to
handle it in configure_caps */
if (bclass->passthrough_on_same_caps) {
gst_base_transform_set_passthrough (trans, FALSE);
}
gst_caps_replace (&trans->cache_caps1, NULL);
gst_caps_replace (&trans->cache_caps2, NULL);
if (trans->priv->pad_mode != GST_PAD_ACTIVATE_NONE && bclass->stop)
result &= bclass->stop (trans);
gst_base_transform_set_allocation (trans, NULL, NULL, 0, 0);
}
return result;
}
static gboolean
gst_base_transform_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
result = gst_base_transform_activate (trans, active);
if (result)
trans->priv->pad_mode =
active ? GST_PAD_ACTIVATE_PUSH : GST_PAD_ACTIVATE_NONE;
gst_object_unref (trans);
return result;
}
static gboolean
gst_base_transform_src_activate_pull (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
result = gst_pad_activate_pull (trans->sinkpad, active);
if (result)
result &= gst_base_transform_activate (trans, active);
if (result)
trans->priv->pad_mode =
active ? GST_PAD_ACTIVATE_PULL : GST_PAD_ACTIVATE_NONE;
gst_object_unref (trans);
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 (GST_IS_BASE_TRANSFORM (trans));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_OBJECT_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_OBJECT_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 (GST_IS_BASE_TRANSFORM (trans), FALSE);
GST_OBJECT_LOCK (trans);
result = trans->passthrough;
GST_OBJECT_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 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 (GST_IS_BASE_TRANSFORM (trans));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_OBJECT_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_OBJECT_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 (GST_IS_BASE_TRANSFORM (trans), FALSE);
GST_OBJECT_LOCK (trans);
result = trans->always_in_place;
GST_OBJECT_UNLOCK (trans);
return result;
}
/**
* gst_base_transform_update_qos:
* @trans: a #GstBaseTransform
* @proportion: the proportion
* @diff: the diff against the clock
* @timestamp: the timestamp of the buffer generating the QoS expressed in
* running_time.
*
* Set the QoS parameters in the transform. This function is called internally
* when a QOS event is received but subclasses can provide custom information
* when needed.
*
* MT safe.
*
* Since: 0.10.5
*/
void
gst_base_transform_update_qos (GstBaseTransform * trans,
gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans,
"qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (timestamp));
GST_OBJECT_LOCK (trans);
trans->priv->proportion = proportion;
trans->priv->earliest_time = timestamp + diff;
GST_OBJECT_UNLOCK (trans);
}
/**
* gst_base_transform_set_qos_enabled:
* @trans: a #GstBaseTransform
* @enabled: new state
*
* Enable or disable QoS handling in the transform.
*
* MT safe.
*
* Since: 0.10.5
*/
void
gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "enabled: %d", enabled);
GST_OBJECT_LOCK (trans);
trans->priv->qos_enabled = enabled;
GST_OBJECT_UNLOCK (trans);
}
/**
* gst_base_transform_is_qos_enabled:
* @trans: a #GstBaseTransform
*
* Queries if the transform will handle QoS.
*
* Returns: TRUE if QoS is enabled.
*
* MT safe.
*
* Since: 0.10.5
*/
gboolean
gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
{
gboolean result;
g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
GST_OBJECT_LOCK (trans);
result = trans->priv->qos_enabled;
GST_OBJECT_UNLOCK (trans);
return result;
}
/**
* gst_base_transform_set_gap_aware:
* @trans: a #GstBaseTransform
* @gap_aware: New state
*
* If @gap_aware is %FALSE (the default), output buffers will have the
* %GST_BUFFER_FLAG_GAP flag unset.
*
* If set to %TRUE, the element must handle output buffers with this flag set
* correctly, i.e. it can assume that the buffer contains neutral data but must
* unset the flag if the output is no neutral data.
*
* MT safe.
*
* Since: 0.10.16
*/
void
gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_OBJECT_LOCK (trans);
trans->priv->gap_aware = gap_aware;
GST_DEBUG_OBJECT (trans, "set gap aware %d", trans->priv->gap_aware);
GST_OBJECT_UNLOCK (trans);
}
/**
* gst_base_transform_suggest:
* @trans: a #GstBaseTransform
* @caps: (transfer none): caps to suggest
* @size: buffer size to suggest
*
* Instructs @trans to suggest new @caps upstream. A copy of @caps will be
* taken.
*
* Since: 0.10.21
*/
void
gst_base_transform_suggest (GstBaseTransform * trans, GstCaps * caps,
gsize size)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
/* push the renegotiate event */
if (!gst_pad_push_event (GST_BASE_TRANSFORM_SINK_PAD (trans),
gst_event_new_reconfigure ()))
GST_DEBUG_OBJECT (trans, "Renegotiate event wasn't handled");
}
/**
* gst_base_transform_reconfigure:
* @trans: a #GstBaseTransform
*
* Instructs @trans to renegotiate a new downstream transform on the next
* buffer. This function is typically called after properties on the transform
* were set that influence the output format.
*
* Since: 0.10.21
*/
void
gst_base_transform_reconfigure (GstBaseTransform * trans)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_OBJECT_LOCK (trans);
GST_DEBUG_OBJECT (trans, "marking reconfigure");
trans->priv->reconfigure = TRUE;
GST_OBJECT_UNLOCK (trans);
}
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