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gstreamer/libs/gst/base/gstbasetransform.c
Rene Stadler ec1b8c7eb6 libs/gst/base/gstbasetransform.c: Fix confusing documentation. 
Original commit message from CVS:
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_set_gap_aware): Fix confusing documentation.
2008-03-23 14:24:48 +00:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
* 2005 Andy Wingo <wingo@fluendo.com>
* 2005 Thomas Vander Stichele <thomas at apestaart dot org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstbasetransform
* @short_description: Base class for simple 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>
*
* Use Cases:
* <orderedlist>
* <listitem>
* <itemizedlist><title>Passthrough mode</title>
* <listitem><para>
* Element has no interest in modifying the buffer. It may want to inspect it,
* in which case the element should have a transform_ip function. If there
* is no transform_ip function in passthrough mode, the buffer is pushed
* intact.
* </para></listitem>
* <listitem><para>
* On the GstBaseTransformClass is the passthrough_on_same_caps variable
* which will automatically set/unset passthrough based on whether the
* element negotiates the same caps on both pads.
* </para></listitem>
* <listitem><para>
* passthrough_on_same_caps on an element that doesn't implement a
* transform_caps function is useful for elements that only inspect data
* (such as level)
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Level</listitem>
* <listitem>Videoscale, audioconvert, ffmpegcolorspace, audioresample in
* certain modes.</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist>
* <title>Modifications in-place - input buffer and output buffer are the
* same thing.</title>
* <listitem><para>
* The element must implement a transform_ip function.
* </para></listitem>
* <listitem><para>
* Output buffer size must <= input buffer size
* </para></listitem>
* <listitem><para>
* If the always_in_place flag is set, non-writable buffers will be copied
* and passed to the transform_ip function, otherwise a new buffer will be
* created and the transform function called.
* </para></listitem>
* <listitem><para>
* Incoming writable buffers will be passed to the transform_ip function
* immediately. </para></listitem>
* <listitem><para>
* only implementing transform_ip and not transform implies always_in_place
* = TRUE
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Volume</listitem>
* <listitem>Audioconvert in certain modes (signed/unsigned
* conversion)</listitem>
* <listitem>ffmpegcolorspace in certain modes (endianness
* swapping)</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist>
* <title>Modifications only to the caps/metadata of a buffer</title>
* <listitem><para>
* The element does not require writable data, but non-writable buffers
* should be subbuffered so that the meta-information can be replaced.
* </para></listitem>
* <listitem><para>
* Elements wishing to operate in this mode should replace the
* prepare_output_buffer method to create subbuffers of the input buffer
* and set always_in_place to TRUE
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Capsfilter when setting caps on outgoing buffers that have
* none.</listitem>
* <listitem>identity when it is going to re-timestamp buffers by
* datarate.</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Normal mode</title>
* <listitem><para>
* always_in_place flag is not set, or there is no transform_ip function
* </para></listitem>
* <listitem><para>
* Element will receive an input buffer and output buffer to operate on.
* </para></listitem>
* <listitem><para>
* Output buffer is allocated by calling the prepare_output_buffer function.
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>Videoscale, ffmpegcolorspace, audioconvert when doing
* scaling/conversions</listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Special output buffer allocations</title>
* <listitem><para>
* Elements which need to do special allocation of their output buffers
* other than what gst_buffer_pad_alloc allows should implement a
* prepare_output_buffer method, which calls the parent implementation and
* passes the newly allocated buffer.
* </para></listitem>
* </itemizedlist>
* <itemizedlist>
* <title>Example elements</title>
* <listitem>efence</listitem>
* </itemizedlist>
* </listitem>
* </orderedlist>
*
* <itemizedlist><title>Sub-class settable flags on GstBaseTransform</title>
* <listitem><para>
* <itemizedlist><title>passthrough</title>
* <listitem><para>
* Implies that in the current configuration, the sub-class is not
* interested in modifying the buffers.
* </para></listitem>
* <listitem><para>
* Elements which are always in passthrough mode whenever the same caps
* has been negotiated on both pads can set the class variable
* passthrough_on_same_caps to have this behaviour automatically.
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* <listitem><para>
* <itemizedlist><title>always_in_place</title>
* <listitem><para>
* Determines whether a non-writable buffer will be copied before passing
* to the transform_ip function.
* </para></listitem>
* <listitem><para>
* Implied TRUE if no transform function is implemented.
* </para></listitem>
* <listitem><para>
* Implied FALSE if ONLY transform function is implemented.
* </para></listitem>
* </itemizedlist>
* </para></listitem>
* </itemizedlist>
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "../../../gst/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;
};
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, gint size, GstCaps * caps, GstBuffer ** buf);
GType
gst_base_transform_get_type (void)
{
static GType base_transform_type = 0;
if (!base_transform_type) {
static const GTypeInfo base_transform_info = {
sizeof (GstBaseTransformClass),
NULL,
NULL,
(GClassInitFunc) gst_base_transform_class_init,
NULL,
NULL,
sizeof (GstBaseTransform),
0,
(GInstanceInitFunc) gst_base_transform_init,
};
base_transform_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
}
return base_transform_type;
}
static void gst_base_transform_finalize (GObject * object);
static void gst_base_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_transform_src_activate_pull (GstPad * pad,
gboolean active);
static gboolean gst_base_transform_sink_activate_push (GstPad * pad,
gboolean active);
static gboolean gst_base_transform_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_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);
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");
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_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_setcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_setcaps));
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->delay_configure = FALSE;
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)
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;
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_DEBUG_OBJECT (trans, "from[%d]: %" GST_PTR_FORMAT, i, nth);
temp = klass->transform_caps (trans, direction, nth);
gst_caps_unref (nth);
GST_DEBUG_OBJECT (trans, " to[%d]: %" GST_PTR_FORMAT, i, temp);
temp = gst_caps_make_writable (temp);
/* FIXME: here we need to only append those structures, that are not yet
* in there
* gst_caps_append (ret, temp);
*/
gst_caps_merge (ret, temp);
}
GST_DEBUG_OBJECT (trans, "merged: (%d)", gst_caps_get_size (ret));
/* now simplify caps
gst_caps_do_simplify (ret);
GST_DEBUG_OBJECT (trans, "simplified: (%d)", gst_caps_get_size (ret));
*/
}
} else {
/* else 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;
}
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 there is a custom transform function, use this */
if (klass->transform_size) {
ret = klass->transform_size (trans, direction, caps, size, othercaps,
othersize);
} else {
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);
if (inunitsize == 0 || (size % inunitsize != 0))
goto no_multiple;
units = size / inunitsize;
if (!gst_base_transform_get_unit_size (trans, othercaps, &outunitsize))
goto no_out_size;
*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;
}
}
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, 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);
/* clear the cache */
gst_caps_replace (&trans->cache_caps1, NULL);
gst_caps_replace (&trans->cache_caps2, NULL);
/* If we've a transform_ip method and same input/output caps, set in_place
* by default. If for some reason the sub-class prefers using a transform
* function, it can clear the in place flag in the set_caps */
gst_base_transform_set_in_place (trans,
klass->transform_ip && trans->have_same_caps);
/* Set the passthrough if the class wants passthrough_on_same_caps
* and we have the same caps on each pad */
if (klass->passthrough_on_same_caps)
gst_base_transform_set_passthrough (trans, trans->have_same_caps);
/* now configure the element with the caps */
if (klass->set_caps) {
GST_DEBUG_OBJECT (trans, "Calling set_caps method to setup caps");
ret = klass->set_caps (trans, in, out);
}
trans->negotiated = ret;
return ret;
}
/* called when new caps arrive on the sink or source pad */
static gboolean
gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseTransform *trans;
GstBaseTransformClass *klass;
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
gboolean peer_checked = FALSE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
/* if we get called recursively, we bail out now to avoid an
* infinite loop. */
if (GST_PAD_IS_IN_SETCAPS (otherpad))
goto done;
/* caps must be fixed here */
if (!gst_caps_is_fixed (caps))
goto unfixed_caps;
/* see how we can transform the input caps. */
othercaps = gst_base_transform_transform_caps (trans,
GST_PAD_DIRECTION (pad), caps);
/* The caps we can actually output is the intersection of the transformed
* caps with the pad template for the pad */
if (othercaps) {
GstCaps *intersect;
const GstCaps *templ_caps;
templ_caps = gst_pad_get_pad_template_caps (otherpad);
intersect = gst_caps_intersect (othercaps, templ_caps);
gst_caps_unref (othercaps);
othercaps = intersect;
}
/* check if transform is empty */
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform;
/* if the othercaps are not fixed, we need to fixate them, first attempt
* is by attempting passthrough if the othercaps are a superset of caps. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"transform returned non fixed %" GST_PTR_FORMAT, othercaps);
/* see if the target caps are a superset of the source caps, in this
* case we can try to perform passthrough */
temp = gst_caps_intersect (othercaps, caps);
GST_DEBUG_OBJECT (trans, "intersect returned %" GST_PTR_FORMAT, temp);
if (temp) {
if (!gst_caps_is_empty (temp) && otherpeer) {
GST_DEBUG_OBJECT (trans, "try passthrough with %" GST_PTR_FORMAT, caps);
/* try passthrough. we know it's fixed, because caps is fixed */
if (gst_pad_accept_caps (otherpeer, caps)) {
GST_DEBUG_OBJECT (trans, "peer accepted %" GST_PTR_FORMAT, caps);
/* peer accepted unmodified caps, we free the original non-fixed
* caps and work with the passthrough caps */
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
/* mark that we checked othercaps with the peer, this
* makes sure we don't call accept_caps again with these same
* caps */
peer_checked = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"peer did not accept %" GST_PTR_FORMAT, caps);
}
}
gst_caps_unref (temp);
}
}
/* second attempt at fixation is done by intersecting with
* the peer caps */
if (!gst_caps_is_fixed (othercaps) && otherpeer) {
/* intersect against what the peer can do */
GstCaps *peercaps;
GstCaps *intersect;
GST_DEBUG_OBJECT (trans, "othercaps now %" GST_PTR_FORMAT, othercaps);
peercaps = gst_pad_get_caps (otherpeer);
intersect = gst_caps_intersect (peercaps, othercaps);
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersect;
peer_checked = FALSE;
GST_DEBUG_OBJECT (trans,
"filtering against peer yields %" GST_PTR_FORMAT, othercaps);
}
if (gst_caps_is_empty (othercaps))
goto no_transform_possible;
/* third attempt at fixation, call the fixate vmethod and
* ultimately call the pad fixate function. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
othercaps, GST_DEBUG_PAD_NAME (otherpad));
/* since we have no other way to fixate left, we might as well just take
* the first of the caps list and fixate that */
/* FIXME: when fixating using the vmethod, it might make sense to fixate
* each of the caps; but Wim doesn't see a use case for that yet */
temp = gst_caps_copy_nth (othercaps, 0);
gst_caps_unref (othercaps);
othercaps = temp;
peer_checked = FALSE;
if (klass->fixate_caps) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT
" on pad %s:%s using fixate_caps vmethod", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
}
/* if still not fixed, no other option but to let the default pad fixate
* function do its job */
if (!gst_caps_is_fixed (othercaps)) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" on pad %s:%s using gst_pad_fixate_caps", othercaps,
GST_DEBUG_PAD_NAME (otherpad));
gst_pad_fixate_caps (otherpad, othercaps);
}
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}
/* caps should be fixed now, if not we have to fail. */
if (!gst_caps_is_fixed (othercaps))
goto could_not_fixate;
/* and peer should accept, don't check again if we already checked the
* othercaps against the peer. */
if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
goto peer_no_accept;
GST_DEBUG_OBJECT (trans, "Input caps were %" GST_PTR_FORMAT
", and got final caps %" GST_PTR_FORMAT, caps, othercaps);
trans->have_same_caps = gst_caps_is_equal (caps, othercaps);
GST_DEBUG_OBJECT (trans, "have_same_caps: %d", trans->have_same_caps);
/* see if we have to configure the element now */
if (!trans->delay_configure) {
GstCaps *incaps, *outcaps;
/* make sure in and out caps are correct */
if (pad == trans->sinkpad) {
incaps = caps;
outcaps = othercaps;
} else {
incaps = othercaps;
outcaps = caps;
}
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
} else {
/* set pending configure, the configure will happen later with the
* caps we set on the pads above. */
trans->pending_configure = TRUE;
}
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
if (pad == trans->srcpad && trans->priv->pad_mode == GST_ACTIVATE_PULL) {
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 */
unfixed_caps:
{
GST_DEBUG_OBJECT (trans, "caps are not fixed %" GST_PTR_FORMAT, caps);
ret = FALSE;
goto done;
}
no_transform:
{
GST_DEBUG_OBJECT (trans,
"transform returned useless %" GST_PTR_FORMAT, othercaps);
ret = FALSE;
goto done;
}
no_transform_possible:
{
GST_DEBUG_OBJECT (trans,
"transform could not transform %" GST_PTR_FORMAT
" in anything we support", caps);
ret = FALSE;
goto done;
}
could_not_fixate:
{
GST_ERROR_OBJECT (trans, "FAILED to fixate %" GST_PTR_FORMAT, othercaps);
ret = FALSE;
goto done;
}
peer_no_accept:
{
GST_DEBUG_OBJECT (trans, "FAILED to get peer of %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
failed_configure:
{
GST_DEBUG_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
}
/* Allocate a buffer using gst_pad_alloc_buffer
*
* This function does not 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, gint out_size, GstCaps * out_caps, GstBuffer ** out_buf)
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
gboolean copy_inbuf = FALSE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* we cannot reconfigure the element yet as we are still processing
* the old buffer. We will therefore delay the reconfiguration of the
* element until we have processed this last buffer. */
trans->delay_configure = TRUE;
/* out_caps is the caps of the src pad gathered through the GST_PAD_CAPS
macro. If a set_caps occurs during this function this caps will become
invalid. We want to keep them during preparation of the output buffer. */
if (out_caps)
gst_caps_ref (out_caps);
/* see if the subclass wants to alloc a buffer */
if (bclass->prepare_output_buffer) {
ret =
bclass->prepare_output_buffer (trans, in_buf, out_size, out_caps,
out_buf);
if (ret != GST_FLOW_OK)
goto done;
/* 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);
}
/* See if we want to prepare the buffer for in place output */
if (*out_buf == NULL && GST_BUFFER_SIZE (in_buf) == out_size
&& bclass->transform_ip) {
if (gst_buffer_is_writable (in_buf)) {
if (trans->have_same_caps) {
/* Input buffer is already writable and caps are the same, return input as
* output buffer. We don't take an additional ref since that would make the
* output buffer not writable anymore. Caller should be prepared to deal
* with proper refcounting of input/output buffers. */
*out_buf = in_buf;
GST_LOG_OBJECT (trans, "reuse input buffer");
} else {
/* Writable buffer, but need to change caps => subbuffer */
*out_buf = gst_buffer_create_sub (in_buf, 0, GST_BUFFER_SIZE (in_buf));
gst_caps_replace (&GST_BUFFER_CAPS (*out_buf), out_caps);
GST_LOG_OBJECT (trans, "created sub-buffer of input buffer");
}
/* we are done now */
goto done;
} else {
/* Make a writable buffer below and copy the data */
copy_inbuf = TRUE;
GST_LOG_OBJECT (trans, "need to copy input buffer to new output buffer");
}
}
if (*out_buf == NULL) {
/* Sub-class didn't already provide a buffer for us. Make one */
ret = gst_pad_alloc_buffer (trans->srcpad,
GST_BUFFER_OFFSET (in_buf), out_size, out_caps, out_buf);
if (ret != GST_FLOW_OK || *out_buf == NULL)
goto done;
/* allocated buffer could be of different caps than what we requested */
if (G_UNLIKELY (!gst_caps_is_equal (out_caps, GST_BUFFER_CAPS (*out_buf)))) {
/* FIXME, it is possible we can reconfigure the transform with new caps at this
* point but for now we just create a buffer ourselves */
gst_buffer_unref (*out_buf);
*out_buf = gst_buffer_new_and_alloc (out_size);
gst_buffer_set_caps (*out_buf, out_caps);
}
}
/* If the output buffer metadata is modifiable, copy timestamps and
* buffer flags */
if (*out_buf != in_buf && gst_buffer_is_metadata_writable (*out_buf)) {
if (copy_inbuf && gst_buffer_is_writable (*out_buf))
memcpy (GST_BUFFER_DATA (*out_buf), GST_BUFFER_DATA (in_buf), out_size);
gst_buffer_copy_metadata (*out_buf, in_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS);
/* Unset the GAP flag if the element is _not_ GAP aware. Otherwise
* it might create an output buffer that does not contain neutral data
* but still has the GAP flag on it! */
if (!trans->priv->gap_aware)
GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
}
done:
if (out_caps)
gst_caps_unref (out_caps);
trans->delay_configure = FALSE;
return ret;
}
/* 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;
GstFlowReturn res;
guint new_size;
gboolean issinkcaps = TRUE;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
/* we cannot run this when we are transforming data and as such doing
* another negotiation in the transform method. */
g_mutex_lock (trans->transform_lock);
*buf = NULL;
GST_DEBUG_OBJECT (trans, "allocating a buffer of size %d ...", size);
if (offset == GST_BUFFER_OFFSET_NONE)
GST_DEBUG_OBJECT (trans, "... and offset NONE");
else
GST_DEBUG_OBJECT (trans, "... and offset %" G_GUINT64_FORMAT, offset);
/* if have_same_caps was previously set to TRUE we need to double check if it
* hasn't changed */
if (trans->have_same_caps) {
GstCaps *sinkcaps;
GST_OBJECT_LOCK (trans->sinkpad);
sinkcaps = GST_PAD_CAPS (trans->sinkpad);
issinkcaps = sinkcaps && (gst_caps_is_equal (sinkcaps, caps));
GST_OBJECT_UNLOCK (trans->sinkpad);
}
/* before any buffers are pushed, have_same_caps is TRUE; allocating can trigger
* a renegotiation and change that to FALSE */
/* bilboed: This seems wrong, from all debug logs, have_same_caps is
* initialized to FALSE */
/* checking against trans->have_same_caps is not enough !! It should also
* check to see if the requested caps are equal to the sink caps */
if (trans->have_same_caps && issinkcaps) {
/* request a buffer with the same caps */
GST_DEBUG_OBJECT (trans, "requesting buffer with same caps, size %d", size);
res =
gst_pad_alloc_buffer_and_set_caps (trans->srcpad, offset, size, caps,
buf);
} else {
/* if we are configured, request a buffer with the src caps */
GstCaps *srccaps;
GstCaps *sinkcaps;
gboolean configured;
/* take lock, peek if the caps are ok */
GST_OBJECT_LOCK (trans->sinkpad);
sinkcaps = GST_PAD_CAPS (trans->sinkpad);
configured = (sinkcaps == NULL || gst_caps_is_equal (sinkcaps, caps));
GST_OBJECT_UNLOCK (trans->sinkpad);
if (!configured)
goto not_configured;
/* take lock on srcpad to grab the caps, caps can change when pushing a
* buffer. */
GST_OBJECT_LOCK (trans->srcpad);
if ((srccaps = GST_PAD_CAPS (trans->srcpad)))
gst_caps_ref (srccaps);
GST_OBJECT_UNLOCK (trans->srcpad);
if (!srccaps)
goto not_configured;
GST_DEBUG_OBJECT (trans, "calling transform_size");
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (pad), caps, size, srccaps, &new_size)) {
gst_caps_unref (srccaps);
goto unknown_size;
}
res =
gst_pad_alloc_buffer_and_set_caps (trans->srcpad, offset, new_size,
srccaps, buf);
gst_caps_unref (srccaps);
}
if (res == GST_FLOW_OK && !trans->have_same_caps) {
/* note that we might have had same caps before, but calling the
alloc_buffer caused setcaps to switch us out of in_place -- in any case
the alloc_buffer served to transmit caps information but we can't use the
buffer. fall through and allocate a buffer corresponding to our sink
caps, if any */
GstCaps *sinkcaps;
GstCaps *srccaps;
GST_OBJECT_LOCK (trans->sinkpad);
if ((sinkcaps = GST_PAD_CAPS (trans->sinkpad)))
gst_caps_ref (sinkcaps);
GST_OBJECT_UNLOCK (trans->sinkpad);
if (!sinkcaps)
goto not_configured;
GST_OBJECT_LOCK (trans->srcpad);
if ((srccaps = GST_PAD_CAPS (trans->srcpad)))
gst_caps_ref (srccaps);
GST_OBJECT_UNLOCK (trans->srcpad);
if (!srccaps) {
gst_caps_unref (sinkcaps);
goto not_configured;
}
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->srcpad), srccaps, GST_BUFFER_SIZE (*buf),
sinkcaps, &new_size)) {
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
goto unknown_size;
}
/* don't need the caps anymore now */
gst_caps_unref (srccaps);
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_size);
GST_BUFFER_OFFSET (*buf) = offset;
/* set caps, gives away the ref */
GST_BUFFER_CAPS (*buf) = sinkcaps;
res = GST_FLOW_OK;
}
done:
g_mutex_unlock (trans->transform_lock);
gst_object_unref (trans);
return res;
not_configured:
{
/* let the default allocator handle it... */
GST_DEBUG_OBJECT (trans, "not configured");
gst_buffer_replace (buf, NULL);
if (trans->passthrough) {
/* ...by calling alloc_buffer without setting caps on the src pad, which
* will force negotiation in the chain function. */
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
} else {
/* ...by letting the default handler create a buffer */
res = GST_FLOW_OK;
}
goto done;
}
unknown_size:
{
/* let the default allocator handle it... */
GST_DEBUG_OBJECT (trans, "unknown size");
gst_buffer_replace (buf, NULL);
if (trans->passthrough) {
/* ...by calling alloc_buffer without setting caps on the src pad, which
* will force negotiation in the chain function. */
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
} else {
/* ...by letting the default handler create a buffer */
res = GST_FLOW_OK;
}
goto done;
}
}
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);
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;
}
static GstFlowReturn
gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer ** outbuf)
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
guint out_size;
gboolean want_in_place;
GstClockTime qostime;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (GST_BUFFER_OFFSET_IS_VALID (inbuf))
GST_LOG_OBJECT (trans, "handling buffer %p of size %d and offset %"
G_GUINT64_FORMAT, inbuf, GST_BUFFER_SIZE (inbuf),
GST_BUFFER_OFFSET (inbuf));
else
GST_LOG_OBJECT (trans, "handling buffer %p of size %d and offset NONE",
inbuf, GST_BUFFER_SIZE (inbuf));
/* Don't allow buffer handling before negotiation, except in passthrough mode
* or if the class doesn't implement a set_caps function (in which case it doesn't
* care about caps)
*/
if (!trans->negotiated && !trans->passthrough && (bclass->set_caps != NULL))
goto not_negotiated;
/* Set discont flag so we can mark the outgoing buffer */
if (GST_BUFFER_IS_DISCONT (inbuf)) {
GST_LOG_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;
qostime = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (inbuf));
if (qostime != -1) {
gboolean need_skip;
GstClockTime earliest_time;
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:
if (trans->passthrough) {
/* In passthrough mode, give transform_ip a look at the
* buffer, without making it writable, or just push the
* data through */
GST_LOG_OBJECT (trans, "element is in passthrough mode");
if (bclass->transform_ip)
ret = bclass->transform_ip (trans, inbuf);
*outbuf = inbuf;
goto done;
}
want_in_place = (bclass->transform_ip != NULL) && trans->always_in_place;
*outbuf = NULL;
if (want_in_place) {
/* If want_in_place is TRUE, we may need to prepare a new output buffer
* Sub-classes can implement a prepare_output_buffer function as they
* wish. */
GST_LOG_OBJECT (trans, "doing inplace transform");
ret = gst_base_transform_prepare_output_buffer (trans, inbuf,
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad), outbuf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto no_buffer;
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_LOG_OBJECT (trans, "doing non-inplace transform");
/* not transforming inplace, figure out the output size */
if (trans->always_in_place) {
out_size = GST_BUFFER_SIZE (inbuf);
} else {
if (!gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->sinkpad), GST_PAD_CAPS (trans->sinkpad),
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad),
&out_size)) {
/* we have an error */
goto no_size;
}
}
/* no in place transform, get buffer, this might renegotiate. */
ret = gst_base_transform_prepare_output_buffer (trans, inbuf, out_size,
GST_PAD_CAPS (trans->srcpad), outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
if (bclass->transform)
ret = bclass->transform (trans, inbuf, *outbuf);
else
ret = GST_FLOW_NOT_SUPPORTED;
}
/* if we got renegotiated we can configure now */
if (trans->pending_configure) {
gboolean success;
success =
gst_base_transform_configure_caps (trans,
GST_PAD_CAPS (trans->sinkpad), GST_PAD_CAPS (trans->srcpad));
trans->pending_configure = FALSE;
if (!success)
goto configure_failed;
}
skip:
/* only unref input buffer if we allocated a new outbuf buffer */
if (*outbuf != inbuf)
gst_buffer_unref (inbuf);
done:
return ret;
/* ERRORS */
not_negotiated:
{
gst_buffer_unref (inbuf);
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("not negotiated"), ("not negotiated"));
return GST_FLOW_NOT_NEGOTIATED;
}
no_size:
{
gst_buffer_unref (inbuf);
GST_ELEMENT_ERROR (trans, STREAM, NOT_IMPLEMENTED,
("subclass did not specify output size"),
("subclass did not specify output size"));
return GST_FLOW_ERROR;
}
no_buffer:
{
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not get buffer from pool: %s",
gst_flow_get_name (ret));
return ret;
}
configure_failed:
{
if (*outbuf != inbuf)
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not negotiate");
return GST_FLOW_NOT_NEGOTIATED;
}
}
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;
GstFlowReturn ret;
GstBuffer *inbuf;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
if (ret == GST_FLOW_OK) {
g_mutex_lock (trans->transform_lock);
ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
g_mutex_unlock (trans->transform_lock);
}
gst_object_unref (trans);
return ret;
}
static GstFlowReturn
gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
{
GstBaseTransform *trans;
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);
}
/* protect transform method and concurrent buffer alloc */
g_mutex_lock (trans->transform_lock);
ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
g_mutex_unlock (trans->transform_lock);
/* 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_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);
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 (trans != NULL);
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 (trans != NULL, 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_ip function is implemented.</listitem>
* </itemizedlist>
*
* MT safe.
*/
void
gst_base_transform_set_in_place (GstBaseTransform * trans, gboolean in_place)
{
GstBaseTransformClass *bclass;
g_return_if_fail (trans != NULL);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_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 (trans != NULL, 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
*
* Set the QoS parameters in the transform.
*
* Since: 0.10.5
*
* MT safe.
*/
void
gst_base_transform_update_qos (GstBaseTransform * trans,
gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp)
{
g_return_if_fail (trans != NULL);
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.
*
* Since: 0.10.5
*
* MT safe.
*/
void
gst_base_transform_set_qos_enabled (GstBaseTransform * trans, gboolean enabled)
{
g_return_if_fail (trans != NULL);
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.
*
* Since: 0.10.5
*
* MT safe.
*/
gboolean
gst_base_transform_is_qos_enabled (GstBaseTransform * trans)
{
gboolean result;
g_return_val_if_fail (trans != NULL, 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.
*
* Since: 0.10.16
*
* MT safe.
*/
void
gst_base_transform_set_gap_aware (GstBaseTransform * trans, gboolean gap_aware)
{
g_return_if_fail (trans != NULL);
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);
}
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