gstreamer/ges/ges-track-video-transition.c

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/* GStreamer Editing Services
* Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
* 2010 Nokia Corporation
*
* 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:ges-track-video-transition
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* @short_description: implements video crossfade transition
*/
#include <ges/ges.h>
#include "ges-internal.h"
G_DEFINE_TYPE (GESTrackVideoTransition, ges_track_video_transition,
GES_TYPE_TRACK_TRANSITION);
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struct _GESTrackVideoTransitionPrivate
{
GESVideoStandardTransitionType type;
/* these enable video interpolation */
GstController *controller;
GstInterpolationControlSource *control_source;
/* so we can support changing between wipes */
GstElement *smpte;
GstElement *mixer;
GstPad *sinka;
GstPad *sinkb;
/* these will be different depending on whether smptealpha or alpha element
* is used */
gdouble start_value;
gdouble end_value;
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};
enum
{
PROP_0,
};
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#define fast_element_link(a,b) gst_element_link_pads_full((a),"src",(b),"sink",GST_PAD_LINK_CHECK_NOTHING)
static GObject *link_element_to_mixer (GstElement * element,
GstElement * mixer);
static GObject *link_element_to_mixer_with_smpte (GstBin * bin,
GstElement * element, GstElement * mixer, gint type,
GstElement ** smpteref);
static void
ges_track_video_transition_duration_changed (GESTrackObject * self,
guint64 duration);
static GstElement *ges_track_video_transition_create_element (GESTrackObject
* self);
static void ges_track_video_transition_dispose (GObject * object);
static void ges_track_video_transition_finalize (GObject * object);
static void ges_track_video_transition_get_property (GObject * object, guint
property_id, GValue * value, GParamSpec * pspec);
static void ges_track_video_transition_set_property (GObject * object, guint
property_id, const GValue * value, GParamSpec * pspec);
static void
ges_track_video_transition_class_init (GESTrackVideoTransitionClass * klass)
{
GObjectClass *object_class;
GESTrackObjectClass *toclass;
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g_type_class_add_private (klass, sizeof (GESTrackVideoTransitionPrivate));
object_class = G_OBJECT_CLASS (klass);
toclass = GES_TRACK_OBJECT_CLASS (klass);
object_class->get_property = ges_track_video_transition_get_property;
object_class->set_property = ges_track_video_transition_set_property;
object_class->dispose = ges_track_video_transition_dispose;
object_class->finalize = ges_track_video_transition_finalize;
toclass->duration_changed = ges_track_video_transition_duration_changed;
toclass->create_element = ges_track_video_transition_create_element;
}
static void
ges_track_video_transition_init (GESTrackVideoTransition * self)
{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TRACK_VIDEO_TRANSITION, GESTrackVideoTransitionPrivate);
self->priv->controller = NULL;
self->priv->control_source = NULL;
self->priv->smpte = NULL;
self->priv->mixer = NULL;
self->priv->sinka = NULL;
self->priv->sinkb = NULL;
self->priv->type = GES_VIDEO_STANDARD_TRANSITION_TYPE_NONE;
self->priv->start_value = 0.0;
self->priv->end_value = 0.0;
}
static void
ges_track_video_transition_dispose (GObject * object)
{
GESTrackVideoTransition *self = GES_TRACK_VIDEO_TRANSITION (object);
GESTrackVideoTransitionPrivate *priv = self->priv;
GST_DEBUG ("disposing");
GST_LOG ("mixer: %p smpte: %p sinka: %p sinkb: %p",
priv->mixer, priv->smpte, priv->sinka, priv->sinkb);
if (priv->controller) {
g_object_unref (priv->controller);
priv->controller = NULL;
if (priv->control_source)
gst_object_unref (priv->control_source);
priv->control_source = NULL;
}
if (priv->sinka && priv->sinkb) {
GST_DEBUG ("releasing request pads for mixer");
gst_element_release_request_pad (priv->mixer, priv->sinka);
gst_element_release_request_pad (priv->mixer, priv->sinkb);
gst_object_unref (priv->sinka);
gst_object_unref (priv->sinkb);
priv->sinka = NULL;
priv->sinkb = NULL;
}
if (priv->mixer) {
GST_LOG ("unrefing mixer");
gst_object_unref (priv->mixer);
priv->mixer = NULL;
}
G_OBJECT_CLASS (ges_track_video_transition_parent_class)->dispose (object);
}
static void
ges_track_video_transition_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_track_video_transition_parent_class)->finalize (object);
}
static void
ges_track_video_transition_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_track_video_transition_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static GstElement *
ges_track_video_transition_create_element (GESTrackObject * object)
{
GstElement *topbin, *iconva, *iconvb, *oconv;
GObject *target = NULL;
const gchar *propname = NULL;
GstElement *mixer = NULL;
GstPad *sinka_target, *sinkb_target, *src_target, *sinka, *sinkb, *src;
GstController *controller;
GstInterpolationControlSource *control_source;
GESTrackVideoTransition *self;
GESTrackVideoTransitionPrivate *priv;
self = GES_TRACK_VIDEO_TRANSITION (object);
priv = self->priv;
GST_LOG ("creating a video bin");
topbin = gst_bin_new ("transition-bin");
iconva = gst_element_factory_make ("ffmpegcolorspace", "tr-csp-a");
iconvb = gst_element_factory_make ("ffmpegcolorspace", "tr-csp-b");
oconv = gst_element_factory_make ("ffmpegcolorspace", "tr-csp-output");
gst_bin_add_many (GST_BIN (topbin), iconva, iconvb, oconv, NULL);
/* Prefer videomixer2 to videomixer */
mixer = gst_element_factory_make ("videomixer2", NULL);
if (mixer == NULL)
mixer = gst_element_factory_make ("videomixer", NULL);
g_object_set (G_OBJECT (mixer), "background", 1, NULL);
gst_bin_add (GST_BIN (topbin), mixer);
if (priv->type != GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE) {
priv->sinka =
(GstPad *) link_element_to_mixer_with_smpte (GST_BIN (topbin), iconva,
mixer, priv->type, NULL);
priv->sinkb =
(GstPad *) link_element_to_mixer_with_smpte (GST_BIN (topbin), iconvb,
mixer, priv->type, &priv->smpte);
target = (GObject *) priv->smpte;
propname = "position";
priv->start_value = 1.0;
priv->end_value = 0.0;
} else {
priv->sinka = (GstPad *) link_element_to_mixer (iconva, mixer);
priv->sinkb = (GstPad *) link_element_to_mixer (iconvb, mixer);
target = (GObject *) priv->sinkb;
propname = "alpha";
priv->start_value = 0.0;
priv->end_value = 1.0;
}
priv->mixer = gst_object_ref (mixer);
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fast_element_link (mixer, oconv);
sinka_target = gst_element_get_static_pad (iconva, "sink");
sinkb_target = gst_element_get_static_pad (iconvb, "sink");
src_target = gst_element_get_static_pad (oconv, "src");
sinka = gst_ghost_pad_new ("sinka", sinka_target);
sinkb = gst_ghost_pad_new ("sinkb", sinkb_target);
src = gst_ghost_pad_new ("src", src_target);
gst_element_add_pad (topbin, src);
gst_element_add_pad (topbin, sinka);
gst_element_add_pad (topbin, sinkb);
gst_object_unref (sinka_target);
gst_object_unref (sinkb_target);
gst_object_unref (src_target);
/* set up interpolation */
g_object_set (target, propname, (gfloat) 0.0, NULL);
controller = gst_object_control_properties (target, propname, NULL);
control_source = gst_interpolation_control_source_new ();
gst_controller_set_control_source (controller,
propname, GST_CONTROL_SOURCE (control_source));
gst_interpolation_control_source_set_interpolation_mode (control_source,
GST_INTERPOLATE_LINEAR);
priv->controller = controller;
priv->control_source = control_source;
return topbin;
}
static GObject *
link_element_to_mixer (GstElement * element, GstElement * mixer)
{
GstPad *sinkpad = gst_element_get_request_pad (mixer, "sink_%d");
GstPad *srcpad = gst_element_get_static_pad (element, "src");
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gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (srcpad);
return G_OBJECT (sinkpad);
}
static GObject *
link_element_to_mixer_with_smpte (GstBin * bin, GstElement * element,
GstElement * mixer, gint type, GstElement ** smpteref)
{
GstPad *srcpad, *sinkpad;
GstElement *smptealpha = gst_element_factory_make ("smptealpha", NULL);
g_object_set (G_OBJECT (smptealpha),
"type", (gint) type, "invert", (gboolean) TRUE, NULL);
gst_bin_add (bin, smptealpha);
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fast_element_link (element, smptealpha);
/* crack */
if (smpteref) {
*smpteref = smptealpha;
}
srcpad = gst_element_get_static_pad (smptealpha, "src");
sinkpad = gst_element_get_request_pad (mixer, "sink_%d");
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gst_pad_link_full (srcpad, sinkpad, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (srcpad);
return G_OBJECT (sinkpad);
}
static void
ges_track_video_transition_duration_changed (GESTrackObject * object,
guint64 duration)
{
GValue start_value = { 0, };
GValue end_value = { 0, };
GstElement *gnlobj = ges_track_object_get_gnlobject (object);
GESTrackVideoTransition *self = GES_TRACK_VIDEO_TRANSITION (object);
GESTrackVideoTransitionPrivate *priv = self->priv;
GST_LOG ("updating controller");
if (G_UNLIKELY (!gnlobj || !priv->control_source))
return;
GST_INFO ("duration: %" G_GUINT64_FORMAT, duration);
g_value_init (&start_value, G_TYPE_DOUBLE);
g_value_init (&end_value, G_TYPE_DOUBLE);
g_value_set_double (&start_value, priv->start_value);
g_value_set_double (&end_value, priv->end_value);
GST_LOG ("setting values on controller");
gst_interpolation_control_source_unset_all (priv->control_source);
gst_interpolation_control_source_set (priv->control_source, 0, &start_value);
gst_interpolation_control_source_set (priv->control_source,
duration, &end_value);
GST_LOG ("done updating controller");
}
/**
* ges_track_video_transition_set_transition_type:
* @self: a #GESTrackVideoTransition
* @type: a #GESVideoStandardTransitionType
*
* Sets the transition being used to @type.
*
* Returns: %TRUE if the transition type was properly changed, else %FALSE.
*/
gboolean
ges_track_video_transition_set_transition_type (GESTrackVideoTransition * self,
GESVideoStandardTransitionType type)
{
GESTrackVideoTransitionPrivate *priv = self->priv;
GST_DEBUG ("%p %d => %d", self, priv->type, type);
if (priv->type && (priv->type != type) &&
((type == GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE) ||
(priv->type == GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE))) {
GST_WARNING
("Changing between 'crossfade' and other types is not supported");
return FALSE;
}
priv->type = type;
if (priv->smpte && (type != GES_VIDEO_STANDARD_TRANSITION_TYPE_CROSSFADE))
g_object_set (priv->smpte, "type", (gint) type, NULL);
return TRUE;
}
/**
* ges_track_video_transition_get_transition_type:
* @trans: a #GESTrackVideoTransition
*
* Get the transition type used by @trans.
*
* Returns: The transition type used by @trans.
*/
GESVideoStandardTransitionType
ges_track_video_transition_get_transition_type (GESTrackVideoTransition * trans)
{
return trans->priv->type;
}
/**
* ges_track_video_transition_new:
*
* Creates a new #GESTrackVideoTransition.
*
* Returns: The newly created #GESTrackVideoTransition, or %NULL if there was an
* error.
*/
GESTrackVideoTransition *
ges_track_video_transition_new (void)
{
return g_object_new (GES_TYPE_TRACK_VIDEO_TRANSITION, NULL);
}