--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/libs/gst/base/gstbasetransform.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,2023 @@
+/* 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
+
+#ifdef __SYMBIAN32__
+#include <gst_global.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>
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#include <gobject_global.h>
+#endif
+GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
+#ifndef __SYMBIAN32__
+#define GST_CAT_DEFAULT gst_base_transform_debug
+#endif
+
+/* 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);
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+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));
+
+ 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, ×tamp);
+ 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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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 (as it is by default) subclasses will never get
+ * output buffers with the %GST_BUFFER_FLAG_GAP flag set.
+ *
+ * If set to %TRUE elements must handle output buffers with this flag set
+ * correctly, i.e. they 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.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+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);
+}