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gstreamer/libs/gst/base/gstbasetransform.c
Sebastian Dröge d12034ab4b gst: Use g_once_init* or G_DEFINE_TYPE
2009-04-04 10:59:39 +02:00

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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;
GstActivateMode pad_mode;
gboolean gap_aware;
/* caps used for allocating buffers */
gboolean proxy_alloc;
GstCaps *sink_alloc;
GstCaps *src_alloc;
/* upstream caps and size suggestions */
GstCaps *sink_suggest;
guint size_suggest;
gboolean suggest_pending;
gboolean reconfigure;
};
static GstElementClass *parent_class = NULL;
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_buffer (GstBaseTransform
* trans, GstBuffer * input, GstBuffer ** buf);
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, guint * 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 gboolean gst_base_transform_check_get_range (GstPad * pad);
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_acceptcaps (GstPad * pad, GstCaps * caps);
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_finalize (GObject * object)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
gst_caps_replace (&trans->priv->sink_suggest, NULL);
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_DEBUG_FUNCPTR (gst_base_transform_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (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_DEBUG_FUNCPTR (gst_base_transform_finalize);
klass->passthrough_on_same_caps = FALSE;
klass->event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
}
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_acceptcaps_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps));
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_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_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_acceptcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps));
gst_pad_set_event_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_src_event));
gst_pad_set_checkgetrange_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_check_get_range));
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->transform_lock = g_mutex_new ();
trans->pending_configure = FALSE;
trans->priv->qos_enabled = DEFAULT_PROP_QOS;
trans->cache_caps1 = NULL;
trans->cache_caps2 = NULL;
trans->priv->pad_mode = GST_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;
}
}
}
/* 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 *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) {
GstCaps *temp;
gint i;
/* start with empty caps */
ret = gst_caps_new_empty ();
GST_DEBUG_OBJECT (trans, "transform caps (direction = %d)", direction);
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);
temp = gst_caps_make_writable (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_LOG_OBJECT (trans, "from[%d]: %" GST_PTR_FORMAT, i, nth);
temp = klass->transform_caps (trans, direction, nth);
gst_caps_unref (nth);
GST_LOG_OBJECT (trans, " to[%d]: %" GST_PTR_FORMAT, i, temp);
temp = gst_caps_make_writable (temp);
/* here we need to only append those structures, that are not yet
* in there, we use the merge function for this */
gst_caps_merge (ret, temp);
GST_LOG_OBJECT (trans, " merged[%d]: %" GST_PTR_FORMAT, i, ret);
}
GST_LOG_OBJECT (trans, "merged: (%d)", gst_caps_get_size (ret));
/* we can't do much simplification here because we don't really want to
* change the caps order
gst_caps_do_simplify (ret);
GST_DEBUG_OBJECT (trans, "simplified: (%d)", gst_caps_get_size (ret));
*/
}
} else {
GST_DEBUG_OBJECT (trans, "identity from: %" GST_PTR_FORMAT, caps);
/* no transform function, use the identity transform */
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,
guint size, GstCaps * othercaps, guint * othersize)
{
guint inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
gboolean ret;
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 (klass->transform_size) {
/* if there is a custom transform function, use this */
ret = klass->transform_size (trans, direction, caps, size, othercaps,
othersize);
} 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 %d, input unit size %d", 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 %d", *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 %u is not a multiple of unit size %u", size,
inunitsize);
g_warning ("%s: size %u is not a multiple of unit size %u",
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)
{
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 transform 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 or the peer can do anything, 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;
}
/* 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;
}
/* check if caps @in on @pad can be transformed to @out on the other pad.
* We don't have a vmethod to test this yet so we have to do a somewhat less
* efficient check for this.
*/
static gboolean
gst_base_transform_can_transform (GstBaseTransform * trans, GstPad * pad,
GstCaps * in, GstCaps * out)
{
GstCaps *othercaps;
/* convert the in caps to all possible out caps */
othercaps =
gst_base_transform_transform_caps (trans, GST_PAD_DIRECTION (pad), in);
/* check if transform is empty */
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform;
/* check if the out caps is a subset of the othercaps */
if (!gst_caps_is_subset (out, othercaps))
goto no_subset;
if (othercaps)
gst_caps_unref (othercaps);
GST_DEBUG_OBJECT (trans, "from %" GST_PTR_FORMAT, in);
GST_DEBUG_OBJECT (trans, "to %" GST_PTR_FORMAT, out);
return TRUE;
/* ERRORS */
no_transform:
{
GST_DEBUG_OBJECT (trans,
"transform returned useless %" GST_PTR_FORMAT, othercaps);
if (othercaps)
gst_caps_unref (othercaps);
return FALSE;
}
no_subset:
{
GST_DEBUG_OBJECT (trans, "no subset");
if (othercaps)
gst_caps_unref (othercaps);
return FALSE;
}
}
/* 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 peer_checked = FALSE;
/* 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);
/* 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);
GST_DEBUG_OBJECT (trans,
"intersecting against padtemplate %" GST_PTR_FORMAT, templ_caps);
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. */
/* FIXME. maybe the caps is not fixed because it has multiple structures of
* fixed 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)) {
GST_DEBUG_OBJECT (trans, "try passthrough with %" GST_PTR_FORMAT, caps);
if (otherpeer) {
/* 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);
}
} else {
GST_DEBUG_OBJECT (trans, "no peer, doing passthrough");
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (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);
} else {
/* else caps are fixed but the subclass may want to add fields */
if (klass->fixate_caps) {
othercaps = gst_caps_make_writable (othercaps);
GST_DEBUG_OBJECT (trans, "doing 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);
}
}
/* 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, "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 (GstPad * pad, GstCaps * caps)
{
GstBaseTransform *trans;
#if 0
GstPad *otherpad;
#endif
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
#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, *intersect;
GST_DEBUG_OBJECT (pad, "non fixed accept caps %" GST_PTR_FORMAT, caps);
/* get all the formats we can handle on this pad */
allowed = gst_pad_get_caps (pad);
if (!allowed)
goto no_transform_possible;
/* intersect with the requested format */
intersect = gst_caps_intersect (allowed, caps);
GST_DEBUG_OBJECT (pad, "intersection %" GST_PTR_FORMAT, intersect);
/* we can accept if the intersection is not empty */
ret = !gst_caps_is_empty (intersect);
gst_caps_unref (intersect);
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);
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
gst_object_unref (trans);
return ret;
/* ERRORS */
no_transform_possible:
{
GST_WARNING_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support (othercaps %" GST_PTR_FORMAT ")",
caps, othercaps);
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 (GstPad * pad, GstCaps * caps)
{
GstBaseTransform *trans;
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
GstCaps *incaps, *outcaps;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
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;
GST_DEBUG_OBJECT (pad, "have new caps %" GST_PTR_FORMAT, 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 0
/* 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 (outcaps);
outcaps = gst_caps_ref (incaps);
}
#endif
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
if (pad == trans->srcpad && trans->priv->pad_mode == GST_ACTIVATE_PULL) {
/* FIXME hm? */
ret &= gst_pad_set_caps (otherpeer, othercaps);
if (!ret) {
GST_INFO_OBJECT (trans, "otherpeer setcaps(%" GST_PTR_FORMAT ") failed",
othercaps);
}
}
done:
if (otherpeer)
gst_object_unref (otherpeer);
if (othercaps)
gst_caps_unref (othercaps);
trans->negotiated = ret;
gst_object_unref (trans);
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;
}
}
/* Allocate a buffer using gst_pad_alloc_buffer
*
* This function can do renegotiation on the source pad
*
* The output buffer is always writable. outbuf can be equal to
* inbuf, the caller should be prepared for this and perform
* appropriate refcounting.
*/
static GstFlowReturn
gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * in_buf, GstBuffer ** out_buf)
{
GstBaseTransformClass *bclass;
GstBaseTransformPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
guint outsize, newsize, expsize;
gboolean discard;
GstCaps *incaps, *oldcaps, *newcaps;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
priv = trans->priv;
*out_buf = NULL;
/* figure out how to allocate a buffer based on the current configuration */
if (trans->passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
/* passthrough, we don't really need to call pad alloc but we still need to
* in order to get upstream negotiation. The output size is the same as the
* input size. */
outsize = GST_BUFFER_SIZE (in_buf);
/* we always alloc and discard here */
discard = TRUE;
} 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 = GST_BUFFER_SIZE (in_buf);
/* only discard it when the input was not writable, otherwise, we reuse
* the input buffer. */
discard = gst_buffer_is_writable (in_buf);
GST_DEBUG_OBJECT (trans, "discard: %d", discard);
} else {
GST_DEBUG_OBJECT (trans, "getting output size for copy transform");
/* copy transform, figure out the output size */
if (!gst_base_transform_transform_size (trans,
GST_PAD_SINK, GST_PAD_CAPS (trans->sinkpad),
GST_BUFFER_SIZE (in_buf), GST_PAD_CAPS (trans->srcpad),
&outsize)) {
goto unknown_size;
}
/* never discard this buffer, we need it for storing the output */
discard = FALSE;
}
}
oldcaps = GST_PAD_CAPS (trans->srcpad);
if (bclass->prepare_output_buffer) {
GST_DEBUG_OBJECT (trans,
"calling prepare buffer with caps %" GST_PTR_FORMAT, oldcaps);
ret =
bclass->prepare_output_buffer (trans, in_buf, outsize, oldcaps,
out_buf);
/* get a new ref to the srcpad caps, the prepare_output_buffer function can
* update the pad caps if it wants */
oldcaps = GST_PAD_CAPS (trans->srcpad);
/* FIXME 0.11:
* decrease refcount again if vmethod returned refcounted in_buf. This
* is because we need to make sure that the buffer is writable for the
* in_place transform. The docs of the vmethod say that you should return
* a reffed inbuf, which is exactly what we don't want :), oh well.. */
if (in_buf == *out_buf)
gst_buffer_unref (in_buf);
/* never discard the buffer from the prepare_buffer method */
if (*out_buf != NULL)
discard = FALSE;
}
if (ret != GST_FLOW_OK)
goto alloc_failed;
if (*out_buf == NULL) {
GST_DEBUG_OBJECT (trans, "doing alloc with caps %" GST_PTR_FORMAT, oldcaps);
ret = gst_pad_alloc_buffer (trans->srcpad,
GST_BUFFER_OFFSET (in_buf), outsize, oldcaps, out_buf);
if (ret != GST_FLOW_OK)
goto alloc_failed;
}
/* must always have a buffer by now */
if (*out_buf == NULL)
goto no_buffer;
/* check if we got different caps on this new output buffer */
newcaps = GST_BUFFER_CAPS (*out_buf);
newsize = GST_BUFFER_SIZE (*out_buf);
if (!gst_caps_is_equal (newcaps, oldcaps)) {
GstCaps *othercaps;
gboolean can_convert;
GST_DEBUG_OBJECT (trans, "received new caps %" GST_PTR_FORMAT, newcaps);
incaps = GST_PAD_CAPS (trans->sinkpad);
/* it's possible that the buffer we got is of the wrong size, get the
* expected size here, we will check the size if we are going to use the
* buffer later on. */
gst_base_transform_transform_size (trans,
GST_PAD_SINK, incaps, GST_BUFFER_SIZE (in_buf), newcaps, &expsize);
/* check if we can convert the current incaps to the new target caps */
can_convert =
gst_base_transform_can_transform (trans, trans->sinkpad, incaps,
newcaps);
if (can_convert) {
GST_DEBUG_OBJECT (trans, "reconfigure transform for current buffer");
/* caps not empty, try to renegotiate to the new format */
if (!gst_base_transform_configure_caps (trans, incaps, newcaps)) {
/* not sure we need to fail hard here, we can simply continue our
* conversion with what we negotiated before */
goto failed_configure;
}
/* new format configure, and use the new output buffer */
gst_pad_set_caps (trans->srcpad, newcaps);
discard = FALSE;
/* if we got a buffer of the wrong size, discard it now and make sure we
* allocate a propertly sized buffer later. */
if (newsize != expsize) {
if (in_buf != *out_buf)
gst_buffer_unref (*out_buf);
*out_buf = NULL;
}
outsize = expsize;
} else {
GST_DEBUG_OBJECT (trans, "cannot perform transform on current buffer");
/* we cannot convert the current buffer but we might be able to suggest a
* new format upstream, try to find what the best format is. */
othercaps =
gst_base_transform_find_transform (trans, trans->srcpad, newcaps);
if (!othercaps) {
GST_DEBUG_OBJECT (trans, "incompatible caps, ignoring");
/* we received caps that we cannot transform. Upstream is behaving badly
* because it should have checked if we could handle these caps. We can
* simply ignore these caps and produce a buffer with our original caps. */
} else {
guint size_suggest;
GST_DEBUG_OBJECT (trans, "getting size of suggestion");
/* not a subset, we have a new upstream suggestion, remember it and
* allocate a default buffer. First we try to convert the size */
if (gst_base_transform_transform_size (trans,
GST_PAD_SRC, newcaps, expsize, othercaps, &size_suggest)) {
/* ok, remember the suggestions now */
GST_DEBUG_OBJECT (trans,
"storing new caps and size suggestion of %u and %" GST_PTR_FORMAT,
size_suggest, othercaps);
GST_OBJECT_LOCK (trans->sinkpad);
if (priv->sink_suggest)
gst_caps_unref (priv->sink_suggest);
priv->sink_suggest = gst_caps_ref (othercaps);
priv->size_suggest = size_suggest;
trans->priv->suggest_pending = TRUE;
GST_OBJECT_UNLOCK (trans->sinkpad);
}
gst_caps_unref (othercaps);
}
if (in_buf != *out_buf)
gst_buffer_unref (*out_buf);
*out_buf = NULL;
}
}
if (*out_buf == NULL) {
if (!discard) {
GST_DEBUG_OBJECT (trans, "make default output buffer of size %d",
outsize);
/* no valid buffer yet, make one */
*out_buf = gst_buffer_new_and_alloc (outsize);
gst_buffer_copy_metadata (*out_buf, in_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
} else {
GST_DEBUG_OBJECT (trans, "reuse input buffer");
*out_buf = in_buf;
}
} else {
if (trans->passthrough && in_buf != *out_buf) {
/* 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. */
GST_DEBUG_OBJECT (trans, "passthrough but different buffers");
discard = TRUE;
}
if (discard) {
GST_DEBUG_OBJECT (trans, "discard buffer, reuse input buffer");
gst_buffer_unref (*out_buf);
*out_buf = in_buf;
} else {
GST_DEBUG_OBJECT (trans, "using allocated buffer");
gst_buffer_copy_metadata (*out_buf, in_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
}
}
gst_buffer_set_caps (*out_buf, GST_PAD_CAPS (trans->srcpad));
/* clear the GAP flag when the subclass does not understand it */
if (!trans->priv->gap_aware)
GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
return ret;
/* ERRORS */
alloc_failed:
{
GST_WARNING_OBJECT (trans, "pad-alloc failed: %s", gst_flow_get_name (ret));
return ret;
}
no_buffer:
{
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("Sub-class failed to provide an output buffer"), (NULL));
return GST_FLOW_ERROR;
}
unknown_size:
{
GST_ERROR_OBJECT (trans, "unknown output size");
return GST_FLOW_ERROR;
}
failed_configure:
{
GST_WARNING_OBJECT (trans, "failed to configure caps");
return GST_FLOW_NOT_NEGOTIATED;
}
}
/* 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,
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, "returned %d from first cache", *size);
return TRUE;
}
if (trans->cache_caps2 == caps) {
*size = trans->cache_caps2_size;
GST_DEBUG_OBJECT (trans, "returned %d 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 %d, result %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 %d 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 %d 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;
}
/* 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;
GstBaseTransformPrivate *priv;
GstFlowReturn res;
gboolean proxy, suggest, same_caps;
GstCaps *sink_suggest;
guint size_suggest;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
priv = trans->priv;
GST_DEBUG_OBJECT (pad, "alloc with caps %" GST_PTR_FORMAT ", size %u", caps,
size);
/* if the code below does not come up with a better buffer, we will return _OK
* and an empty buffer. This will trigger the core to allocate a buffer with
* given input size and caps. */
*buf = NULL;
res = GST_FLOW_OK;
/* we remember our previous alloc request to quickly see if we can proxy or
* not. We skip this check if we have a pending suggestion. */
GST_OBJECT_LOCK (pad);
same_caps = !priv->suggest_pending && caps &&
gst_caps_is_equal (priv->sink_alloc, caps);
GST_OBJECT_UNLOCK (pad);
if (same_caps) {
/* we have seen this before, see below if we need to proxy */
GST_DEBUG_OBJECT (trans, "have old caps");
sink_suggest = caps;
size_suggest = size;
suggest = FALSE;
} else {
GstCaps *temp;
const GstCaps *templ;
gboolean empty;
GST_DEBUG_OBJECT (trans, "new format %" GST_PTR_FORMAT, caps);
/* if we have a suggestion, pretend we got these as input */
GST_OBJECT_LOCK (pad);
if ((priv->sink_suggest && !gst_caps_is_equal (caps, priv->sink_suggest))) {
sink_suggest = gst_caps_ref (priv->sink_suggest);
size_suggest = priv->size_suggest;
GST_DEBUG_OBJECT (trans, "have suggestion %" GST_PTR_FORMAT,
sink_suggest);
/* suggest is TRUE when we have a custom suggestion pending that we need
* to unref later. */
suggest = TRUE;
} else {
GST_DEBUG_OBJECT (trans, "using caps %" GST_PTR_FORMAT, caps);
sink_suggest = caps;
size_suggest = size;
suggest = FALSE;
}
priv->suggest_pending = FALSE;
GST_OBJECT_UNLOCK (pad);
/* check if we actually handle this format on the sinkpad */
if (sink_suggest) {
templ = gst_pad_get_pad_template_caps (pad);
temp = gst_caps_intersect (sink_suggest, templ);
empty = gst_caps_is_empty (temp);
gst_caps_unref (temp);
if (empty)
goto not_supported;
}
/* find the best format for the other side here we decide if we will proxy
* the caps or not. */
if (sink_suggest == NULL) {
/* always proxy when the caps are NULL. When this is a new format, see if
* we can proxy it downstream */
GST_DEBUG_OBJECT (trans, "null caps, marking for proxy");
priv->proxy_alloc = TRUE;
} else {
GstCaps *othercaps;
/* we have a new format, see what we need to proxy to */
othercaps = gst_base_transform_find_transform (trans, pad, sink_suggest);
if (!othercaps || gst_caps_is_empty (othercaps)) {
/* no transform possible, we certainly can't proxy */
GST_DEBUG_OBJECT (trans, "can't find transform, disable proxy");
priv->proxy_alloc = FALSE;
} else {
/* we transformed into something */
if (gst_caps_is_equal (caps, othercaps)) {
GST_DEBUG_OBJECT (trans,
"best caps same as input, marking for proxy");
priv->proxy_alloc = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"best caps different from input, disable proxy");
priv->proxy_alloc = FALSE;
}
}
if (othercaps)
gst_caps_unref (othercaps);
}
}
/* remember the new caps */
GST_OBJECT_LOCK (pad);
gst_caps_replace (&priv->sink_alloc, sink_suggest);
GST_OBJECT_UNLOCK (pad);
proxy = priv->proxy_alloc;
GST_DEBUG_OBJECT (trans, "doing default alloc, proxy %d", proxy);
/* we only want to proxy if we have no suggestion pending, FIXME */
if (proxy && !suggest) {
GstCaps *newcaps;
GST_DEBUG_OBJECT (trans, "proxy buffer-alloc with caps %" GST_PTR_FORMAT
", size %u", caps, size);
/* we always proxy the input caps, never the suggestion. The reason is that
* We don't yet handle the caps of renegotiation in here. FIXME */
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
if (res != GST_FLOW_OK)
goto alloc_failed;
/* check if the caps changed */
newcaps = GST_BUFFER_CAPS (*buf);
GST_DEBUG_OBJECT (trans, "got caps %" GST_PTR_FORMAT, newcaps);
if (!gst_caps_is_equal (newcaps, caps)) {
GST_DEBUG_OBJECT (trans, "caps are new");
/* we have new caps, see if we can proxy downstream */
if (gst_pad_peer_accept_caps (pad, newcaps)) {
/* peer accepts the caps, return a buffer in this format */
GST_DEBUG_OBJECT (trans, "peer accepted new caps");
/* remember the format */
GST_OBJECT_LOCK (pad);
gst_caps_replace (&priv->sink_alloc, newcaps);
GST_OBJECT_UNLOCK (pad);
} else {
GST_DEBUG_OBJECT (trans, "peer did not accept new caps");
/* peer does not accept the caps, free the buffer we received and
* create a buffer of the requested format by the default handler. */
gst_buffer_unref (*buf);
*buf = NULL;
}
} else {
GST_DEBUG_OBJECT (trans, "received required caps from peer");
}
}
if (suggest) {
/* there was a custom suggestion, create a buffer of this format and return
* it. Note that this format */
*buf = gst_buffer_new_and_alloc (size_suggest);
GST_DEBUG_OBJECT (trans,
"doing suggestion of size %u, caps %" GST_PTR_FORMAT, size_suggest,
sink_suggest);
GST_BUFFER_CAPS (*buf) = sink_suggest;
}
gst_object_unref (trans);
return res;
/* ERRORS */
alloc_failed:
{
GST_DEBUG_OBJECT (trans, "pad alloc failed: %s", gst_flow_get_name (res));
if (suggest)
gst_caps_unref (sink_suggest);
gst_object_unref (trans);
return res;
}
not_supported:
{
GST_DEBUG_OBJECT (trans, "pad alloc with unsupported caps");
if (suggest)
gst_caps_unref (sink_suggest);
gst_object_unref (trans);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static gboolean
gst_base_transform_sink_event (GstPad * pad, GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = TRUE;
gboolean forward = TRUE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->event)
forward = bclass->event (trans, event);
/* FIXME, do this in the default event handler so the subclass can do
* something different. */
if (forward)
ret = gst_pad_push_event (trans->srcpad, event);
else
gst_event_unref (event);
gst_object_unref (trans);
return ret;
}
static gboolean
gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
{
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;
GST_OBJECT_UNLOCK (trans);
/* we need new segment info after the flush. */
trans->have_newsegment = FALSE;
gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
break;
case GST_EVENT_EOS:
break;
case GST_EVENT_TAG:
break;
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gboolean update;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
trans->have_newsegment = TRUE;
gst_segment_set_newsegment_full (&trans->segment, update, rate, arate,
format, start, stop, time);
if (format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (trans, "received TIME NEW_SEGMENT %" GST_TIME_FORMAT
" -- %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT
", accum %" GST_TIME_FORMAT,
GST_TIME_ARGS (trans->segment.start),
GST_TIME_ARGS (trans->segment.stop),
GST_TIME_ARGS (trans->segment.time),
GST_TIME_ARGS (trans->segment.accum));
} else {
GST_DEBUG_OBJECT (trans, "received NEW_SEGMENT %" G_GINT64_FORMAT
" -- %" G_GINT64_FORMAT ", time %" G_GINT64_FORMAT
", accum %" G_GINT64_FORMAT,
trans->segment.start, trans->segment.stop,
trans->segment.time, trans->segment.accum);
}
break;
}
default:
break;
}
return TRUE;
}
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));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->src_event)
ret = bclass->src_event (trans, event);
gst_object_unref (trans);
return ret;
}
static gboolean
gst_base_transform_src_eventfunc (GstBaseTransform * trans, GstEvent * event)
{
gboolean ret;
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, &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, reconfigure;
GstClockTime qostime;
GstCaps *incaps;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (G_LIKELY ((incaps = GST_BUFFER_CAPS (inbuf)))) {
GST_OBJECT_LOCK (trans);
reconfigure = trans->priv->reconfigure;
trans->priv->reconfigure = FALSE;
GST_OBJECT_UNLOCK (trans);
if (G_UNLIKELY (reconfigure)) {
GST_DEBUG_OBJECT (trans, "we had a pending 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->sinkpad, incaps))
goto not_negotiated;
}
}
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
GST_DEBUG_OBJECT (trans, "handling buffer %p of size %d and offset %"
G_GUINT64_FORMAT, inbuf, GST_BUFFER_SIZE (inbuf),
GST_BUFFER_OFFSET (inbuf));
else
GST_DEBUG_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;
/* 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 */
qostime = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (inbuf));
if (qostime != -1) {
gboolean need_skip;
GstClockTime earliest_time;
/* 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;
/* check for QoS, don't perform conversion for buffers
* that are known to be late. */
need_skip = trans->priv->qos_enabled &&
earliest_time != -1 && qostime != -1 && qostime <= earliest_time;
GST_OBJECT_UNLOCK (trans);
if (need_skip) {
GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, trans, "skipping transform: qostime %"
GST_TIME_FORMAT " <= %" GST_TIME_FORMAT,
GST_TIME_ARGS (qostime), GST_TIME_ARGS (earliest_time));
/* 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. While we call pad-alloc we could renegotiate the srcpad format or
* have a new suggestion for upstream buffer-alloc.
* In any case, outbuf will contain a buffer suitable for doing the configured
* transform after this function. */
ret = gst_base_transform_prepare_output_buffer (trans, inbuf, outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto no_buffer;
/* 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) {
/* different buffers, copy the input to the output first, we then do an
* in-place transform on the output buffer. */
memcpy (GST_BUFFER_DATA (*outbuf), GST_BUFFER_DATA (inbuf),
GST_BUFFER_SIZE (inbuf));
}
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 (*outbuf != inbuf)
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_buffer:
{
gst_buffer_unref (inbuf);
GST_WARNING_OBJECT (trans, "could not get buffer from pool: %s",
gst_flow_get_name (ret));
return ret;
}
}
static gboolean
gst_base_transform_check_get_range (GstPad * pad)
{
GstBaseTransform *trans;
gboolean ret;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
ret = gst_pad_check_pull_range (trans->sinkpad);
gst_object_unref (trans);
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 last_stop = GST_CLOCK_TIME_NONE;
GstBuffer *outbuf = NULL;
trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
/* calculate end position of the incoming buffer */
if (GST_BUFFER_TIMESTAMP (buffer) != GST_CLOCK_TIME_NONE) {
if (GST_BUFFER_DURATION (buffer) != GST_CLOCK_TIME_NONE)
last_stop = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
else
last_stop = GST_BUFFER_TIMESTAMP (buffer);
}
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)) {
/* Remember last stop position */
if ((last_stop != GST_CLOCK_TIME_NONE) &&
(trans->segment.format == GST_FORMAT_TIME))
gst_segment_set_last_stop (&trans->segment, GST_FORMAT_TIME, last_stop);
/* 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_metadata_writable (outbuf);
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
}
trans->priv->discont = FALSE;
}
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) {
if (trans->priv->pad_mode == GST_ACTIVATE_NONE && bclass->start)
result &= bclass->start (trans);
GST_OBJECT_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);
trans->negotiated = FALSE;
trans->have_newsegment = FALSE;
gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
trans->priv->proportion = 1.0;
trans->priv->earliest_time = -1;
trans->priv->discont = FALSE;
gst_caps_replace (&trans->priv->sink_suggest, NULL);
GST_OBJECT_UNLOCK (trans);
} 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);
gst_caps_replace (&trans->priv->sink_alloc, NULL);
gst_caps_replace (&trans->priv->sink_suggest, NULL);
if (trans->priv->pad_mode != GST_ACTIVATE_NONE && bclass->stop)
result &= bclass->stop (trans);
}
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_ACTIVATE_PUSH : GST_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_ACTIVATE_PULL : GST_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: 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,
guint size)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_OBJECT_LOCK (trans->sinkpad);
if (trans->priv->sink_suggest)
gst_caps_unref (trans->priv->sink_suggest);
if (caps)
caps = gst_caps_copy (caps);
trans->priv->sink_suggest = caps;
trans->priv->size_suggest = size;
trans->priv->suggest_pending = TRUE;
GST_DEBUG_OBJECT (trans, "new suggest %" GST_PTR_FORMAT, caps);
GST_OBJECT_UNLOCK (trans->sinkpad);
}
/**
* 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_caps_replace (&trans->priv->sink_alloc, NULL);
GST_OBJECT_UNLOCK (trans);
}
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