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gstreamer/libs/gst/base/gstbasetransform.c

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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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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. Elements
* that are suitable for implementation using #GstBaseTransform are ones
* where the size and caps of the output is known entirely from the input
* caps and buffer sizes. These include elements that directly transform
* one buffer into another, modify the contents of a buffer in-place, as
* well as elements that collate multiple input buffers into one output buffer,
* or that expand one input buffer into multiple output buffers. See below
* for more concrete use cases.
*
* 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>
* The #GstBaseTransformClass.passthrough_on_same_caps variable
* will automatically set/unset passthrough based on whether the
* element negotiates the same caps on both pads.
* </para></listitem>
* <listitem><para>
* #GstBaseTransformClass.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, videoconvert, 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>videoconvert 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, videoconvert, 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
* beyond allocating output buffers via the negotiated allocator or
* buffer pool should implement the prepare_output_buffer method.
* </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 "../../../gst/glib-compat-private.h"
#include "gstbasetransform.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
{
/* Set by sub-class */
gboolean passthrough;
gboolean always_in_place;
GstCaps *cache_caps1;
gsize cache_caps1_size;
GstCaps *cache_caps2;
gsize cache_caps2_size;
gboolean have_same_caps;
gboolean negotiated;
/* QoS *//* with LOCK */
gboolean qos_enabled;
gdouble proportion;
GstClockTime earliest_time;
/* previous buffer had a discont */
gboolean discont;
GstPadMode pad_mode;
gboolean gap_aware;
gboolean prefer_passthrough;
/* QoS stats */
guint64 processed;
guint64 dropped;
GstClockTime position_out;
GstBufferPool *pool;
gboolean pool_active;
GstAllocator *allocator;
GstAllocationParams params;
GstQuery *query;
};
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 default_submit_input_buffer (GstBaseTransform * trans,
gboolean is_discont, GstBuffer * input);
static GstFlowReturn default_generate_output (GstBaseTransform * trans,
GstBuffer ** outbuf);
/* 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_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static gboolean gst_base_transform_sink_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, 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, GstObject * parent,
GstEvent * event);
static gboolean gst_base_transform_src_eventfunc (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_transform_sink_eventfunc (GstBaseTransform * trans,
GstEvent * event);
static GstFlowReturn gst_base_transform_getrange (GstPad * pad,
GstObject * parent, guint64 offset, guint length, GstBuffer ** buffer);
static GstFlowReturn gst_base_transform_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static GstCaps *gst_base_transform_default_transform_caps (GstBaseTransform *
trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static GstCaps *gst_base_transform_default_fixate_caps (GstBaseTransform *
trans, GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstCaps *gst_base_transform_query_caps (GstBaseTransform * trans,
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_default_decide_allocation (GstBaseTransform
* trans, GstQuery * query);
static gboolean gst_base_transform_default_propose_allocation (GstBaseTransform
* trans, GstQuery * decide_query, GstQuery * query);
static gboolean gst_base_transform_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_base_transform_default_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query);
static gboolean gst_base_transform_default_transform_size (GstBaseTransform *
trans, GstPadDirection direction, GstCaps * caps, gsize size,
GstCaps * othercaps, gsize * othersize);
static GstFlowReturn default_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf);
static gboolean default_copy_metadata (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean
gst_base_transform_default_transform_meta (GstBaseTransform * trans,
GstBuffer * inbuf, GstMeta * meta, GstBuffer * outbuf);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_base_transform_finalize (GObject * object)
{
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_transform_class_init (GstBaseTransformClass * klass)
{
GObjectClass *gobject_class;
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->passthrough_on_same_caps = FALSE;
klass->transform_ip_on_passthrough = TRUE;
klass->transform_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_caps);
klass->fixate_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_default_fixate_caps);
klass->accept_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
klass->decide_allocation =
GST_DEBUG_FUNCPTR (gst_base_transform_default_decide_allocation);
klass->propose_allocation =
GST_DEBUG_FUNCPTR (gst_base_transform_default_propose_allocation);
klass->transform_size =
GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_size);
klass->transform_meta =
GST_DEBUG_FUNCPTR (gst_base_transform_default_transform_meta);
klass->sink_event = GST_DEBUG_FUNCPTR (gst_base_transform_sink_eventfunc);
klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
klass->prepare_output_buffer =
GST_DEBUG_FUNCPTR (default_prepare_output_buffer);
klass->copy_metadata = GST_DEBUG_FUNCPTR (default_copy_metadata);
klass->submit_input_buffer = GST_DEBUG_FUNCPTR (default_submit_input_buffer);
klass->generate_output = GST_DEBUG_FUNCPTR (default_generate_output);
}
static void
gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * bclass)
{
GstPadTemplate *pad_template;
GstBaseTransformPrivate *priv;
GST_DEBUG ("gst_base_transform_init");
priv = 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_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_activatemode_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_mode));
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_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_activatemode_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_mode));
gst_pad_set_query_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_query));
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
priv->qos_enabled = DEFAULT_PROP_QOS;
priv->cache_caps1 = NULL;
priv->cache_caps2 = NULL;
priv->pad_mode = GST_PAD_MODE_NONE;
priv->gap_aware = FALSE;
priv->prefer_passthrough = TRUE;
priv->passthrough = FALSE;
if (bclass->transform == NULL) {
/* If no transform function, always_in_place is TRUE */
GST_DEBUG_OBJECT (trans, "setting in_place TRUE");
priv->always_in_place = TRUE;
if (bclass->transform_ip == NULL) {
GST_DEBUG_OBJECT (trans, "setting passthrough TRUE");
priv->passthrough = TRUE;
}
}
priv->processed = 0;
priv->dropped = 0;
}
static GstCaps *
gst_base_transform_default_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCaps *ret;
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);
}
return ret;
}
/* 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 = NULL;
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 (ret);
ret = intersection;
}
}
#endif
}
GST_DEBUG_OBJECT (trans, "to: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
gst_base_transform_default_transform_meta (GstBaseTransform * trans,
GstBuffer * inbuf, GstMeta * meta, GstBuffer * outbuf)
{
const GstMetaInfo *info = meta->info;
const gchar *const *tags;
tags = gst_meta_api_type_get_tags (info->api);
if (!tags)
return TRUE;
return FALSE;
}
static gboolean
gst_base_transform_default_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, gsize size,
GstCaps * othercaps, gsize * othersize)
{
gsize inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
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;
} 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);
}
return TRUE;
/* 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;
}
}
/* 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)
{
GstBaseTransformClass *klass;
gboolean ret = FALSE;
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);
}
return ret;
}
/* 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_query_caps (GstBaseTransform * trans, GstPad * pad,
GstCaps * filter)
{
GstPad *otherpad;
GstCaps *peercaps = NULL, *caps, *temp, *peerfilter = NULL;
GstCaps *templ, *otempl;
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
templ = gst_pad_get_pad_template_caps (pad);
otempl = gst_pad_get_pad_template_caps (otherpad);
/* first prepare the filter to be send onwards. We need to filter and
* transform it to valid caps for the otherpad. */
if (filter) {
GST_DEBUG_OBJECT (pad, "filter caps %" GST_PTR_FORMAT, filter);
/* filtered against our padtemplate of this 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);
/* 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);
if (!gst_caps_is_empty (peerfilter)) {
/* and filter against the template of the other pad */
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, otempl);
/* We keep the caps sorted like the returned caps */
temp =
gst_caps_intersect_full (peerfilter, otempl,
GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
gst_caps_unref (peerfilter);
peerfilter = temp;
}
}
GST_DEBUG_OBJECT (pad, "peer filter caps %" GST_PTR_FORMAT, peerfilter);
if (peerfilter && gst_caps_is_empty (peerfilter)) {
GST_DEBUG_OBJECT (pad, "peer filter caps are empty");
caps = peerfilter;
peerfilter = NULL;
goto done;
}
/* query the peer with the transformed filter */
peercaps = gst_pad_peer_query_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 */
GST_DEBUG_OBJECT (pad, "our template %" GST_PTR_FORMAT, otempl);
temp = gst_caps_intersect_full (peercaps, otempl, GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (pad, "intersected %" GST_PTR_FORMAT, temp);
} else {
temp = gst_caps_ref (otempl);
}
/* 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 || gst_caps_is_empty (caps))
goto done;
if (peercaps) {
/* and filter against the template of this 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);
caps = temp;
if (trans->priv->prefer_passthrough) {
/* 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)) {
caps = gst_caps_merge (temp, caps);
} else {
gst_caps_unref (temp);
}
}
} else {
gst_caps_unref (caps);
/* no peer or the peer can do anything, our padtemplate is enough then */
if (filter) {
caps = gst_caps_intersect_full (filter, templ, GST_CAPS_INTERSECT_FIRST);
} else {
caps = gst_caps_ref (templ);
}
}
done:
GST_DEBUG_OBJECT (trans, "returning %" GST_PTR_FORMAT, caps);
if (peercaps)
gst_caps_unref (peercaps);
gst_caps_unref (templ);
gst_caps_unref (otempl);
return caps;
}
/* takes ownership of the pool, allocator and query */
static gboolean
gst_base_transform_set_allocation (GstBaseTransform * trans,
GstBufferPool * pool, GstAllocator * allocator,
GstAllocationParams * params, GstQuery * query)
{
GstAllocator *oldalloc;
GstBufferPool *oldpool;
GstQuery *oldquery;
GstBaseTransformPrivate *priv = trans->priv;
GST_OBJECT_LOCK (trans);
oldpool = priv->pool;
priv->pool = pool;
priv->pool_active = FALSE;
oldalloc = priv->allocator;
priv->allocator = allocator;
oldquery = priv->query;
priv->query = query;
if (params)
priv->params = *params;
else
gst_allocation_params_init (&priv->params);
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);
}
if (oldalloc) {
gst_object_unref (oldalloc);
}
if (oldquery) {
gst_query_unref (oldquery);
}
return TRUE;
}
static gboolean
gst_base_transform_default_decide_allocation (GstBaseTransform * trans,
GstQuery * query)
{
guint i, n_metas;
GstBaseTransformClass *klass;
GstCaps *outcaps;
GstBufferPool *pool;
guint size, min, max;
GstAllocator *allocator;
GstAllocationParams params;
GstStructure *config;
gboolean update_allocator;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
n_metas = gst_query_get_n_allocation_metas (query);
for (i = 0; i < n_metas; i++) {
GType api;
const GstStructure *params;
gboolean remove;
api = gst_query_parse_nth_allocation_meta (query, i, &params);
/* by default we remove all metadata, subclasses should implement a
* filter_meta function */
if (gst_meta_api_type_has_tag (api, _gst_meta_tag_memory)) {
/* remove all memory dependent metadata because we are going to have to
* allocate different memory for input and output. */
GST_LOG_OBJECT (trans, "removing memory specific metadata %s",
g_type_name (api));
remove = TRUE;
} else if (G_LIKELY (klass->filter_meta)) {
/* remove if the subclass said so */
remove = !klass->filter_meta (trans, query, api, params);
GST_LOG_OBJECT (trans, "filter_meta for api %s returned: %s",
g_type_name (api), (remove ? "remove" : "keep"));
} else {
GST_LOG_OBJECT (trans, "removing metadata %s", g_type_name (api));
remove = TRUE;
}
if (remove) {
gst_query_remove_nth_allocation_meta (query, i);
i--;
n_metas--;
}
}
gst_query_parse_allocation (query, &outcaps, NULL);
/* we got configuration from our peer or the decide_allocation method,
* parse them */
if (gst_query_get_n_allocation_params (query) > 0) {
/* try the allocator */
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
update_allocator = TRUE;
} else {
allocator = NULL;
gst_allocation_params_init (&params);
update_allocator = FALSE;
}
if (gst_query_get_n_allocation_pools (query) > 0) {
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
if (pool == NULL) {
/* no pool, we can make our own */
GST_DEBUG_OBJECT (trans, "no pool, making new pool");
pool = gst_buffer_pool_new ();
}
} else {
pool = NULL;
size = min = max = 0;
}
/* now configure */
if (pool) {
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
gst_buffer_pool_config_set_allocator (config, allocator, &params);
/* buffer pool may have to do some changes */
if (!gst_buffer_pool_set_config (pool, config)) {
config = gst_buffer_pool_get_config (pool);
/* If change are not acceptable, fallback to generic pool */
if (!gst_buffer_pool_config_validate_params (config, outcaps, size, min,
max)) {
GST_DEBUG_OBJECT (trans, "unsuported pool, making new pool");
gst_object_unref (pool);
pool = gst_buffer_pool_new ();
gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
gst_buffer_pool_config_set_allocator (config, allocator, &params);
}
if (!gst_buffer_pool_set_config (pool, config))
goto config_failed;
}
}
if (update_allocator)
gst_query_set_nth_allocation_param (query, 0, allocator, &params);
else
gst_query_add_allocation_param (query, allocator, &params);
if (allocator)
gst_object_unref (allocator);
if (pool) {
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
gst_object_unref (pool);
}
return TRUE;
config_failed:
GST_ELEMENT_ERROR (trans, RESOURCE, SETTINGS,
("Failed to configure the buffer pool"),
("Configuration is most likely invalid, please report this issue."));
return FALSE;
}
static gboolean
gst_base_transform_do_bufferpool (GstBaseTransform * trans, GstCaps * outcaps)
{
GstQuery *query;
gboolean result = TRUE;
GstBufferPool *pool = NULL;
GstBaseTransformClass *klass;
GstBaseTransformPrivate *priv = trans->priv;
GstAllocator *allocator;
GstAllocationParams params;
/* 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 proposed values then.
*/
if (priv->passthrough || priv->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");
gst_base_transform_set_allocation (trans, NULL, NULL, NULL, NULL);
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");
g_assert (klass->decide_allocation != NULL);
result = klass->decide_allocation (trans, query);
GST_DEBUG_OBJECT (trans, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, result,
query);
if (!result)
goto no_decide_allocation;
/* we got configuration from our peer or the decide_allocation method,
* parse them */
if (gst_query_get_n_allocation_params (query) > 0) {
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
} else {
allocator = NULL;
gst_allocation_params_init (&params);
}
if (gst_query_get_n_allocation_pools (query) > 0)
gst_query_parse_nth_allocation_pool (query, 0, &pool, NULL, NULL, NULL);
/* now store */
result =
gst_base_transform_set_allocation (trans, pool, allocator, &params,
query);
return result;
/* Errors */
no_decide_allocation:
{
GST_WARNING_OBJECT (trans, "Subclass failed to decide allocation");
gst_query_unref (query);
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;
GstBaseTransformPrivate *priv = trans->priv;
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 (&priv->cache_caps1, NULL);
gst_caps_replace (&priv->cache_caps2, NULL);
/* figure out same caps state */
priv->have_same_caps = gst_caps_is_equal (in, out);
GST_DEBUG_OBJECT (trans, "have_same_caps: %d", priv->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, priv->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);
}
return ret;
}
static GstCaps *
gst_base_transform_default_fixate_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
{
othercaps = gst_caps_fixate (othercaps);
GST_DEBUG_OBJECT (trans, "fixated to %" GST_PTR_FORMAT, othercaps);
return 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 && !gst_caps_is_empty (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_query_caps (otherpeer, othercaps);
GST_DEBUG_OBJECT (trans, "Resulted in %" GST_PTR_FORMAT, peercaps);
if (!gst_caps_is_empty (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;
} else {
gst_caps_unref (othercaps);
othercaps = peercaps;
}
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) {
GST_DEBUG_OBJECT (trans, "calling fixate_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 */
othercaps =
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_query_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)
{
GstPad *pad, *otherpad;
GstCaps *templ, *otempl, *ocaps = NULL;
gboolean ret = TRUE;
pad =
(direction ==
GST_PAD_SINK) ? GST_BASE_TRANSFORM_SINK_PAD (trans) :
GST_BASE_TRANSFORM_SRC_PAD (trans);
otherpad =
(direction ==
GST_PAD_SINK) ? GST_BASE_TRANSFORM_SRC_PAD (trans) :
GST_BASE_TRANSFORM_SINK_PAD (trans);
GST_DEBUG_OBJECT (trans, "accept caps %" GST_PTR_FORMAT, caps);
templ = gst_pad_get_pad_template_caps (pad);
otempl = gst_pad_get_pad_template_caps (otherpad);
/* get all the formats we can handle on this pad */
GST_DEBUG_OBJECT (trans, "intersect with pad template: %" GST_PTR_FORMAT,
templ);
if (!gst_caps_can_intersect (caps, templ))
goto reject_caps;
GST_DEBUG_OBJECT (trans, "trying to transform with filter: %"
GST_PTR_FORMAT " (the other pad template)", otempl);
ocaps = gst_base_transform_transform_caps (trans, direction, caps, otempl);
if (!ocaps || gst_caps_is_empty (ocaps))
goto no_transform_possible;
done:
GST_DEBUG_OBJECT (trans, "accept-caps result: %d", ret);
if (ocaps)
gst_caps_unref (ocaps);
gst_caps_unref (templ);
gst_caps_unref (otempl);
return ret;
/* ERRORS */
reject_caps:
{
GST_DEBUG_OBJECT (trans, "caps can't intersect with the template");
ret = FALSE;
goto done;
}
no_transform_possible:
{
GST_DEBUG_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
ret = FALSE;
goto done;
}
}
/* called when new caps arrive on the sink 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.
*/
static gboolean
gst_base_transform_setcaps (GstBaseTransform * trans, GstPad * pad,
GstCaps * incaps)
{
GstBaseTransformPrivate *priv = trans->priv;
GstCaps *outcaps, *prev_incaps = NULL, *prev_outcaps = NULL;
gboolean ret = TRUE;
GST_DEBUG_OBJECT (pad, "have new caps %p %" GST_PTR_FORMAT, incaps, incaps);
/* find best possible caps for the other pad */
outcaps = gst_base_transform_find_transform (trans, pad, incaps);
if (!outcaps || gst_caps_is_empty (outcaps))
goto no_transform_possible;
/* configure the element now */
/* 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);
}
prev_incaps = gst_pad_get_current_caps (trans->sinkpad);
prev_outcaps = gst_pad_get_current_caps (trans->srcpad);
if (prev_incaps && prev_outcaps && gst_caps_is_equal (prev_incaps, incaps)
&& gst_caps_is_equal (prev_outcaps, outcaps)) {
GST_DEBUG_OBJECT (trans,
"New caps equal to old ones: %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT,
incaps, outcaps);
ret = TRUE;
} else {
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
if (!prev_outcaps || !gst_caps_is_equal (outcaps, prev_outcaps))
/* let downstream know about our caps */
ret = gst_pad_set_caps (trans->srcpad, outcaps);
}
if (ret) {
/* try to get a pool when needed */
ret = gst_base_transform_do_bufferpool (trans, outcaps);
}
done:
if (outcaps)
gst_caps_unref (outcaps);
if (prev_incaps)
gst_caps_unref (prev_incaps);
if (prev_outcaps)
gst_caps_unref (prev_outcaps);
GST_OBJECT_LOCK (trans);
priv->negotiated = ret;
GST_OBJECT_UNLOCK (trans);
return ret;
/* ERRORS */
no_transform_possible:
{
GST_WARNING_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", incaps);
ret = FALSE;
goto done;
}
failed_configure:
{
GST_WARNING_OBJECT (trans, "FAILED to configure incaps %" GST_PTR_FORMAT
" and outcaps %" GST_PTR_FORMAT, incaps, outcaps);
ret = FALSE;
goto done;
}
}
static gboolean
gst_base_transform_default_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
gboolean ret;
if (decide_query == NULL) {
GST_DEBUG_OBJECT (trans, "doing passthrough query");
ret = gst_pad_peer_query (trans->srcpad, query);
} else {
guint i, n_metas;
/* non-passthrough, copy all metadata, decide_query does not contain the
* metadata anymore that depends on the buffer memory */
n_metas = gst_query_get_n_allocation_metas (decide_query);
for (i = 0; i < n_metas; i++) {
GType api;
const GstStructure *params;
api = gst_query_parse_nth_allocation_meta (decide_query, i, &params);
GST_DEBUG_OBJECT (trans, "proposing metadata %s", g_type_name (api));
gst_query_add_allocation_meta (query, api, params);
}
ret = TRUE;
}
return ret;
}
static gboolean
gst_base_transform_reconfigure (GstBaseTransform * trans)
{
gboolean reconfigure, ret = TRUE;
reconfigure = gst_pad_check_reconfigure (trans->srcpad);
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 done;
/* if we need to reconfigure we pretend new caps arrived. This
* will reconfigure the transform with the new output format. */
if (!gst_base_transform_setcaps (trans, trans->sinkpad, incaps)) {
GST_ELEMENT_WARNING (trans, STREAM, FORMAT,
("not negotiated"), ("not negotiated"));
ret = FALSE;
}
gst_caps_unref (incaps);
}
done:
return ret;
}
static gboolean
gst_base_transform_default_query (GstBaseTransform * trans,
GstPadDirection direction, GstQuery * query)
{
gboolean ret = FALSE;
GstPad *pad, *otherpad;
GstBaseTransformClass *klass;
GstBaseTransformPrivate *priv = trans->priv;
if (direction == GST_PAD_SRC) {
pad = trans->srcpad;
otherpad = trans->sinkpad;
} else {
pad = trans->sinkpad;
otherpad = trans->srcpad;
}
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_ALLOCATION:
{
GstQuery *decide_query = NULL;
/* can only be done on the sinkpad */
if (direction != GST_PAD_SINK)
goto done;
ret = gst_base_transform_reconfigure (trans);
if (G_UNLIKELY (!ret))
goto done;
GST_OBJECT_LOCK (trans);
if (!priv->negotiated && !priv->passthrough && (klass->set_caps != NULL)) {
GST_DEBUG_OBJECT (trans,
"not negotiated yet but need negotiation, can't answer ALLOCATION query");
GST_OBJECT_UNLOCK (trans);
goto done;
}
decide_query = trans->priv->query;
trans->priv->query = NULL;
GST_OBJECT_UNLOCK (trans);
GST_DEBUG_OBJECT (trans,
"calling propose allocation with query %" GST_PTR_FORMAT,
decide_query);
/* pass the query to the propose_allocation vmethod if any */
if (G_LIKELY (klass->propose_allocation))
ret = klass->propose_allocation (trans, decide_query, query);
else
ret = FALSE;
if (decide_query) {
GST_OBJECT_LOCK (trans);
if (trans->priv->query == NULL)
trans->priv->query = decide_query;
else
gst_query_unref (decide_query);
GST_OBJECT_UNLOCK (trans);
}
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;
}
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_base_transform_query_caps (trans, pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
break;
}
default:
ret = gst_pad_peer_query (otherpad, query);
break;
}
done:
return ret;
}
static gboolean
gst_base_transform_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = FALSE;
trans = GST_BASE_TRANSFORM (parent);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->query)
ret = bclass->query (trans, GST_PAD_DIRECTION (pad), query);
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;
GstBaseTransformClass *bclass;
GstCaps *incaps, *outcaps;
gsize insize, outsize;
gboolean res;
priv = trans->priv;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* figure out how to allocate an output buffer */
if (priv->passthrough) {
/* passthrough, we will not modify the incoming buffer so we can just
* reuse it */
GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
*outbuf = inbuf;
goto done;
}
/* we can't reuse the input buffer */
if (priv->pool) {
if (!priv->pool_active) {
GST_DEBUG_OBJECT (trans, "setting pool %p active", priv->pool);
if (!gst_buffer_pool_set_active (priv->pool, TRUE))
goto activate_failed;
priv->pool_active = TRUE;
}
GST_DEBUG_OBJECT (trans, "using pool alloc");
ret = gst_buffer_pool_acquire_buffer (priv->pool, outbuf, NULL);
if (ret != GST_FLOW_OK)
goto alloc_failed;
goto copy_meta;
}
/* no pool, we need to figure out the size of the output buffer first */
if ((bclass->transform_ip != NULL) && priv->always_in_place) {
/* we want to do an in-place alloc */
if (gst_buffer_is_writable (inbuf)) {
GST_DEBUG_OBJECT (trans, "inplace reuse writable input buffer");
*outbuf = inbuf;
} else {
GST_DEBUG_OBJECT (trans, "making writable buffer copy");
/* we make a copy of the input buffer */
*outbuf = gst_buffer_copy (inbuf);
}
goto done;
}
/* 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);
/* srcpad might be flushing already if we're being shut down */
if (outcaps == NULL)
goto no_outcaps;
GST_DEBUG_OBJECT (trans, "getting output size for alloc");
/* copy transform, figure out the output size */
insize = gst_buffer_get_size (inbuf);
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->params);
if (!*outbuf) {
ret = GST_FLOW_ERROR;
goto alloc_failed;
}
copy_meta:
/* 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));
}
done:
return GST_FLOW_OK;
/* ERRORS */
activate_failed:
{
GST_ELEMENT_ERROR (trans, RESOURCE, SETTINGS,
("failed to activate bufferpool"), ("failed to activate bufferpool"));
return GST_FLOW_ERROR;
}
unknown_size:
{
GST_ERROR_OBJECT (trans, "unknown output size");
return GST_FLOW_ERROR;
}
alloc_failed:
{
GST_DEBUG_OBJECT (trans, "could not allocate buffer from pool");
return ret;
}
no_outcaps:
{
GST_DEBUG_OBJECT (trans, "no output caps, source pad has been deactivated");
gst_caps_unref (incaps);
return GST_FLOW_FLUSHING;
}
}
typedef struct
{
GstBaseTransform *trans;
GstBuffer *outbuf;
} CopyMetaData;
static gboolean
foreach_metadata (GstBuffer * inbuf, GstMeta ** meta, gpointer user_data)
{
CopyMetaData *data = user_data;
GstBaseTransform *trans = data->trans;
GstBaseTransformClass *klass;
const GstMetaInfo *info = (*meta)->info;
GstBuffer *outbuf = data->outbuf;
gboolean do_copy = FALSE;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (gst_meta_api_type_has_tag (info->api, _gst_meta_tag_memory)) {
/* never call the transform_meta with memory specific metadata */
GST_DEBUG_OBJECT (trans, "not copying memory specific metadata %s",
g_type_name (info->api));
do_copy = FALSE;
} else if (klass->transform_meta) {
do_copy = klass->transform_meta (trans, outbuf, *meta, inbuf);
GST_DEBUG_OBJECT (trans, "transformed metadata %s: copy: %d",
g_type_name (info->api), do_copy);
}
/* we only copy metadata when the subclass implemented a transform_meta
* function and when it returns %TRUE */
if (do_copy) {
GstMetaTransformCopy copy_data = { FALSE, 0, -1 };
GST_DEBUG_OBJECT (trans, "copy metadata %s", g_type_name (info->api));
/* simply copy then */
info->transform_func (outbuf, *meta, inbuf,
_gst_meta_transform_copy, &copy_data);
}
return TRUE;
}
static gboolean
default_copy_metadata (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf)
{
GstBaseTransformPrivate *priv = trans->priv;
CopyMetaData data;
/* 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);
data.trans = trans;
data.outbuf = outbuf;
gst_buffer_foreach_meta (inbuf, foreach_metadata, &data);
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;
GstBaseTransformPrivate *priv = trans->priv;
/* see if we have the result cached */
if (priv->cache_caps1 == caps) {
*size = priv->cache_caps1_size;
GST_DEBUG_OBJECT (trans,
"returned %" G_GSIZE_FORMAT " from first cache", *size);
return TRUE;
}
if (priv->cache_caps2 == caps) {
*size = priv->cache_caps2_size;
GST_DEBUG_OBJECT (trans,
"returned %" G_GSIZE_FORMAT " from second cached", *size);
return TRUE;
}
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
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 (priv->cache_caps1 == NULL) {
gst_caps_replace (&priv->cache_caps1, caps);
priv->cache_caps1_size = *size;
GST_DEBUG_OBJECT (trans,
"caching %" G_GSIZE_FORMAT " in first cache", *size);
} else if (priv->cache_caps2 == NULL) {
gst_caps_replace (&priv->cache_caps2, caps);
priv->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");
}
}
return res;
}
static gboolean
gst_base_transform_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (parent);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->sink_event)
ret = bclass->sink_event (trans, event);
else
gst_event_unref (event);
return ret;
}
static gboolean
gst_base_transform_sink_eventfunc (GstBaseTransform * trans, GstEvent * event)
{
gboolean ret = TRUE, forward = TRUE;
GstBaseTransformPrivate *priv = trans->priv;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
break;
case GST_EVENT_FLUSH_STOP:
GST_OBJECT_LOCK (trans);
/* reset QoS parameters */
priv->proportion = 1.0;
priv->earliest_time = -1;
priv->discont = FALSE;
priv->processed = 0;
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);
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);
/* clear any pending reconfigure flag */
gst_pad_check_reconfigure (trans->srcpad);
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, GstObject * parent,
GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (parent);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->src_event)
ret = bclass->src_event (trans, event);
else
gst_event_unref (event);
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;
}
/* Takes the input buffer */
static GstFlowReturn
default_submit_input_buffer (GstBaseTransform * trans, gboolean is_discont,
GstBuffer * inbuf)
{
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GstBaseTransformPrivate *priv = trans->priv;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime running_time;
GstClockTime timestamp;
if (G_UNLIKELY (!gst_base_transform_reconfigure (trans)))
goto not_negotiated;
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
GST_DEBUG_OBJECT (trans,
"handling buffer %p of size %" G_GSIZE_FORMAT ", PTS %" GST_TIME_FORMAT
" and offset %" G_GUINT64_FORMAT, inbuf, gst_buffer_get_size (inbuf),
GST_TIME_ARGS (GST_BUFFER_PTS (inbuf)), GST_BUFFER_OFFSET (inbuf));
else
GST_DEBUG_OBJECT (trans,
"handling buffer %p of size %" G_GSIZE_FORMAT ", PTS %" GST_TIME_FORMAT
" and offset NONE", inbuf, gst_buffer_get_size (inbuf),
GST_TIME_ARGS (GST_BUFFER_PTS (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 (!priv->negotiated && !priv->passthrough && (bclass->set_caps != NULL))
goto not_negotiated;
/* 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 = priv->earliest_time;
proportion = priv->proportion;
/* check for QoS, don't perform conversion for buffers
* that are known to be late. */
need_skip = 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));
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,
priv->processed, priv->dropped);
gst_element_post_message (GST_ELEMENT_CAST (trans), qos_msg);
/* mark discont for next buffer */
priv->discont = TRUE;
ret = GST_BASE_TRANSFORM_FLOW_DROPPED;
goto skip;
}
}
no_qos:
/* Stash input buffer where the default generate_output
* function can find it */
if (trans->queued_buf)
gst_buffer_unref (trans->queued_buf);
trans->queued_buf = inbuf;
return ret;
skip:
gst_buffer_unref (inbuf);
return ret;
not_negotiated:
{
gst_buffer_unref (inbuf);
if (GST_PAD_IS_FLUSHING (trans->srcpad))
return GST_FLOW_FLUSHING;
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstFlowReturn
default_generate_output (GstBaseTransform * trans, GstBuffer ** outbuf)
{
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GstBaseTransformPrivate *priv = trans->priv;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *inbuf;
gboolean want_in_place;
/* Retrieve stashed input buffer, if the default submit_input_buffer
* was run. Takes ownership back from there */
inbuf = trans->queued_buf;
trans->queued_buf = NULL;
/* This default processing method needs one input buffer to feed to
* the transform functions, we can't do anything without it */
if (inbuf == NULL)
return GST_FLOW_OK;
/* 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;
GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", inbuf,
*outbuf);
/* now perform the needed transform */
if (priv->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_on_passthrough && bclass->transform_ip) {
GST_DEBUG_OBJECT (trans, "doing passthrough transform_ip");
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_DEBUG_OBJECT (trans, "element is in passthrough");
}
} else {
want_in_place = (bclass->transform_ip != NULL) && priv->always_in_place;
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace transform");
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;
}
}
/* 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 */
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, GstObject * parent, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstBaseTransformClass *klass = GST_BASE_TRANSFORM_GET_CLASS (parent);
GstBaseTransform *trans = GST_BASE_TRANSFORM (parent);
GstBaseTransformPrivate *priv = trans->priv;
GstFlowReturn ret;
GstBuffer *inbuf = NULL;
GstBuffer *outbuf = NULL;
/* Try and generate a buffer, if the sub-class wants more data,
* pull some and repeat until a buffer (or error) is produced */
do {
ret = klass->generate_output (trans, &outbuf);
/* Consume the DROPPED return value and go get more data */
if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED)
ret = GST_FLOW_OK;
if (ret != GST_FLOW_OK || outbuf != NULL)
break;
/* No buffer generated, try and pull data */
ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto pull_error;
if (klass->before_transform)
klass->before_transform (trans, inbuf);
/* Set discont flag so we can mark the next outgoing buffer */
if (GST_BUFFER_IS_DISCONT (inbuf)) {
GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", inbuf);
priv->discont = TRUE;
}
/* FIXME: Input offsets and lengths need to be translated, as per
* the FIXME above. For now, just advance somewhat */
offset += gst_buffer_get_size (inbuf);
ret = klass->submit_input_buffer (trans, priv->discont, inbuf);
if (ret != GST_FLOW_OK) {
if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED)
ret = GST_FLOW_OK;
goto done;
}
} while (ret == GST_FLOW_OK && outbuf == NULL);
*buffer = outbuf;
if (outbuf) {
/* apply DISCONT flag if the buffer is not yet marked as such */
if (priv->discont) {
GST_DEBUG_OBJECT (trans, "we have a pending DISCONT");
if (!GST_BUFFER_IS_DISCONT (outbuf)) {
GST_DEBUG_OBJECT (trans, "marking DISCONT on output buffer");
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
}
priv->discont = FALSE;
}
priv->processed++;
}
done:
return ret;
/* ERRORS */
pull_error:
{
GST_DEBUG_OBJECT (trans, "failed to pull a buffer: %s",
gst_flow_get_name (ret));
goto done;
}
}
/* The flow of the chain function is the reverse of the
* getrange() function - we have data, feed it to the sub-class
* and then iterate, pushing buffers it generates until it either
* wants more data or returns an error */
static GstFlowReturn
gst_base_transform_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstBaseTransform *trans = GST_BASE_TRANSFORM (parent);
GstBaseTransformClass *klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GstBaseTransformPrivate *priv = trans->priv;
GstFlowReturn ret;
GstClockTime position = GST_CLOCK_TIME_NONE;
GstClockTime timestamp, duration;
GstBuffer *outbuf = NULL;
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;
}
if (klass->before_transform)
klass->before_transform (trans, buffer);
/* Set discont flag so we can mark the outgoing buffer */
if (GST_BUFFER_IS_DISCONT (buffer)) {
GST_DEBUG_OBJECT (trans, "got DISCONT buffer %p", buffer);
priv->discont = TRUE;
}
/* Takes ownership of input buffer */
ret = klass->submit_input_buffer (trans, priv->discont, buffer);
if (ret != GST_FLOW_OK)
goto done;
do {
outbuf = NULL;
ret = klass->generate_output (trans, &outbuf);
/* 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)
priv->position_out = position_out;
/* apply DISCONT flag if the buffer is not yet marked as such */
if (trans->priv->discont) {
GST_DEBUG_OBJECT (trans, "we have a pending DISCONT");
if (!GST_BUFFER_IS_DISCONT (outbuf)) {
GST_DEBUG_OBJECT (trans, "marking DISCONT on output buffer");
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
}
priv->discont = FALSE;
}
priv->processed++;
ret = gst_pad_push (trans->srcpad, outbuf);
} else {
GST_DEBUG_OBJECT (trans, "we got return %s", gst_flow_get_name (ret));
gst_buffer_unref (outbuf);
}
}
} while (ret == GST_FLOW_OK && outbuf != NULL);
done:
/* convert internal flow to OK and mark discont for the next buffer. */
if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
GST_DEBUG_OBJECT (trans, "dropped a buffer, marking DISCONT");
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;
GstBaseTransformPrivate *priv = trans->priv;
gboolean result = TRUE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (active) {
GstCaps *incaps, *outcaps;
if (priv->pad_mode == GST_PAD_MODE_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)
priv->have_same_caps =
gst_caps_is_equal (incaps, outcaps) || priv->passthrough;
else
priv->have_same_caps = priv->passthrough;
GST_DEBUG_OBJECT (trans, "have_same_caps %d", priv->have_same_caps);
priv->negotiated = FALSE;
trans->have_segment = FALSE;
gst_segment_init (&trans->segment, GST_FORMAT_UNDEFINED);
priv->position_out = GST_CLOCK_TIME_NONE;
priv->proportion = 1.0;
priv->earliest_time = -1;
priv->discont = FALSE;
priv->processed = 0;
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);
priv->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 (&priv->cache_caps1, NULL);
gst_caps_replace (&priv->cache_caps2, NULL);
/* Make sure any left over buffer is freed */
gst_buffer_replace (&trans->queued_buf, NULL);
if (priv->pad_mode != GST_PAD_MODE_NONE && bclass->stop)
result &= bclass->stop (trans);
gst_base_transform_set_allocation (trans, NULL, NULL, NULL, NULL);
}
return result;
}
static gboolean
gst_base_transform_sink_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result = FALSE;
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (parent);
switch (mode) {
case GST_PAD_MODE_PUSH:
{
result = gst_base_transform_activate (trans, active);
if (result)
trans->priv->pad_mode = active ? GST_PAD_MODE_PUSH : GST_PAD_MODE_NONE;
break;
}
default:
result = TRUE;
break;
}
return result;
}
static gboolean
gst_base_transform_src_activate_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean result = FALSE;
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (parent);
switch (mode) {
case GST_PAD_MODE_PULL:
{
result =
gst_pad_activate_mode (trans->sinkpad, GST_PAD_MODE_PULL, active);
if (result)
result &= gst_base_transform_activate (trans, active);
if (result)
trans->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
break;
}
default:
result = TRUE;
break;
}
return result;
}
/**
* gst_base_transform_set_passthrough:
* @trans: the #GstBaseTransform to set
* @passthrough: boolean indicating passthrough mode.
*
* Set passthrough mode for this filter by default. This is mostly
* useful for filters that do not care about negotiation.
*
* Always %TRUE for filters which don't implement either a transform
* or transform_ip method.
*
* MT safe.
*/
void
gst_base_transform_set_passthrough (GstBaseTransform * trans,
gboolean passthrough)
{
GstBaseTransformClass *bclass;
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_OBJECT_LOCK (trans);
if (!passthrough) {
if (bclass->transform_ip || bclass->transform)
trans->priv->passthrough = FALSE;
} else {
trans->priv->passthrough = TRUE;
}
GST_DEBUG_OBJECT (trans, "set passthrough %d", trans->priv->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->priv->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->priv->always_in_place = TRUE;
}
} else {
if (bclass->transform) {
GST_DEBUG_OBJECT (trans, "setting in_place FALSE");
trans->priv->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->priv->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.
*/
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.
*/
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.
*/
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.
*/
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_set_prefer_passthrough:
* @trans: a #GstBaseTransform
* @prefer_passthrough: New state
*
* If @prefer_passthrough is %TRUE (the default), @trans will check and
* prefer passthrough caps from the list of caps returned by the
* transform_caps vmethod.
*
* If set to %FALSE, the element must order the caps returned from the
* transform_caps function in such a way that the preferred format is
* first in the list. This can be interesting for transforms that can do
* passthrough transforms but prefer to do something else, like a
* capsfilter.
*
* MT safe.
*
* Since: 1.0.1
*/
void
gst_base_transform_set_prefer_passthrough (GstBaseTransform * trans,
gboolean prefer_passthrough)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
GST_OBJECT_LOCK (trans);
trans->priv->prefer_passthrough = prefer_passthrough;
GST_DEBUG_OBJECT (trans, "prefer passthrough %d", prefer_passthrough);
GST_OBJECT_UNLOCK (trans);
}
/**
* gst_base_transform_reconfigure_sink:
* @trans: a #GstBaseTransform
*
* Instructs @trans to request renegotiation upstream. This function is
* typically called after properties on the transform were set that
* influence the input format.
*/
void
gst_base_transform_reconfigure_sink (GstBaseTransform * trans)
{
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_src:
* @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.
*/
void
gst_base_transform_reconfigure_src (GstBaseTransform * trans)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
gst_pad_mark_reconfigure (trans->srcpad);
}
/**
* gst_base_transform_get_buffer_pool:
* @trans: a #GstBaseTransform
*
* Returns: (transfer full): the instance of the #GstBufferPool used
* by @trans; free it after use it
*/
GstBufferPool *
gst_base_transform_get_buffer_pool (GstBaseTransform * trans)
{
g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), NULL);
if (trans->priv->pool)
return gst_object_ref (trans->priv->pool);
return NULL;
}
/**
* gst_base_transform_get_allocator:
* @trans: a #GstBaseTransform
* @allocator: (out) (allow-none) (transfer full): the #GstAllocator
* used
* @params: (out) (allow-none) (transfer full): the
* #GstAllocationParams of @allocator
*
* Lets #GstBaseTransform sub-classes to know the memory @allocator
* used by the base class and its @params.
*
* Unref the @allocator after use it.
*/
void
gst_base_transform_get_allocator (GstBaseTransform * trans,
GstAllocator ** allocator, GstAllocationParams * params)
{
g_return_if_fail (GST_IS_BASE_TRANSFORM (trans));
if (allocator)
*allocator = trans->priv->allocator ?
gst_object_ref (trans->priv->allocator) : NULL;
if (params)
*params = trans->priv->params;
}
/**
* gst_base_transform_update_src_caps:
* @trans: a #GstBaseTransform
* @updated_caps: An updated version of the srcpad caps to be pushed
* downstream
*
* Updates the srcpad caps and send the caps downstream. This function
* can be used by subclasses when they have already negotiated their caps
* but found a change in them (or computed new informations). This way,
* they can notify downstream about that change without loosing any
* buffer.
*
* Returns: %TRUE if the caps could be send downstream %FALSE otherwise
*
* Since: 1.6
*/
gboolean
gst_base_transform_update_src_caps (GstBaseTransform * trans,
GstCaps * updated_caps)
{
g_return_val_if_fail (GST_IS_BASE_TRANSFORM (trans), FALSE);
if (gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (trans),
gst_event_new_caps (updated_caps))) {
gst_pad_mark_reconfigure (trans->srcpad);
return TRUE;
}
return FALSE;
}
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