gstreamer/ges/ges-track-audio-transition.c
2010-07-14 13:29:23 +02:00

280 lines
8.7 KiB
C

/* 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-audio-transition
* @short_description: implements audio crossfade transition
*/
#include "ges-internal.h"
#include "ges-track-object.h"
#include "ges-track-audio-transition.h"
G_DEFINE_TYPE (GESTrackAudioTransition, ges_track_audio_transition,
GES_TYPE_TRACK_TRANSITION);
enum
{
PROP_0,
};
#define fast_element_link(a,b) gst_element_link_pads_full((a),"src",(b),"sink",GST_PAD_LINK_CHECK_NOTHING)
static void
ges_track_audio_transition_duration_changed (GESTrackObject * self, guint64);
static GstElement *ges_track_audio_transition_create_element (GESTrackTransition
* self);
static void ges_track_audio_transition_dispose (GObject * object);
static void ges_track_audio_transition_finalize (GObject * object);
static void ges_track_audio_transition_get_property (GObject * object, guint
property_id, GValue * value, GParamSpec * pspec);
static void ges_track_audio_transition_set_property (GObject * object, guint
property_id, const GValue * value, GParamSpec * pspec);
static void
ges_track_audio_transition_class_init (GESTrackAudioTransitionClass * klass)
{
GObjectClass *object_class;
GESTrackObjectClass *toclass;
GESTrackTransitionClass *pclass;
object_class = G_OBJECT_CLASS (klass);
toclass = GES_TRACK_OBJECT_CLASS (klass);
pclass = GES_TRACK_TRANSITION_CLASS (klass);
object_class->get_property = ges_track_audio_transition_get_property;
object_class->set_property = ges_track_audio_transition_set_property;
object_class->dispose = ges_track_audio_transition_dispose;
object_class->finalize = ges_track_audio_transition_finalize;
toclass->duration_changed = ges_track_audio_transition_duration_changed;
pclass->create_element = ges_track_audio_transition_create_element;
}
static void
ges_track_audio_transition_init (GESTrackAudioTransition * self)
{
self->a_controller = NULL;
self->a_control_source = NULL;
self->b_controller = NULL;
self->b_control_source = NULL;
}
static void
ges_track_audio_transition_dispose (GObject * object)
{
GESTrackAudioTransition *self;
self = GES_TRACK_AUDIO_TRANSITION (object);
if (self->a_controller) {
g_object_unref (self->a_controller);
self->a_controller = NULL;
if (self->a_control_source)
gst_object_unref (self->a_control_source);
self->a_control_source = NULL;
}
if (self->b_controller) {
g_object_unref (self->b_controller);
self->b_controller = NULL;
if (self->b_control_source)
gst_object_unref (self->b_control_source);
self->b_control_source = NULL;
}
G_OBJECT_CLASS (ges_track_audio_transition_parent_class)->dispose (object);
}
static void
ges_track_audio_transition_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_track_audio_transition_parent_class)->finalize (object);
}
static void
ges_track_audio_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_audio_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 GObject *
link_element_to_mixer_with_volume (GstBin * bin, GstElement * element,
GstElement * mixer)
{
GstElement *volume = gst_element_factory_make ("volume", NULL);
gst_bin_add (bin, volume);
if (!fast_element_link (element, volume) ||
!gst_element_link_pads_full (volume, "src", mixer, "sink%d",
GST_PAD_LINK_CHECK_NOTHING))
GST_ERROR_OBJECT (bin, "Error linking volume to mixer");
return G_OBJECT (volume);
}
static GstElement *
ges_track_audio_transition_create_element (GESTrackTransition * object)
{
GESTrackAudioTransition *self;
GstElement *topbin, *iconva, *iconvb, *oconv;
GObject *atarget, *btarget = NULL;
const gchar *propname = "volume";
GstElement *mixer = NULL;
GstPad *sinka_target, *sinkb_target, *src_target, *sinka, *sinkb, *src;
GstController *acontroller, *bcontroller;
GstInterpolationControlSource *acontrol_source, *bcontrol_source;
self = GES_TRACK_AUDIO_TRANSITION (object);
GST_LOG ("creating an audio bin");
topbin = gst_bin_new ("transition-bin");
iconva = gst_element_factory_make ("audioconvert", "tr-aconv-a");
iconvb = gst_element_factory_make ("audioconvert", "tr-aconv-b");
oconv = gst_element_factory_make ("audioconvert", "tr-aconv-output");
gst_bin_add_many (GST_BIN (topbin), iconva, iconvb, oconv, NULL);
mixer = gst_element_factory_make ("adder", NULL);
gst_bin_add (GST_BIN (topbin), mixer);
atarget = link_element_to_mixer_with_volume (GST_BIN (topbin), iconva, mixer);
btarget = link_element_to_mixer_with_volume (GST_BIN (topbin), iconvb, mixer);
g_assert (atarget && btarget);
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);
/* set up interpolation */
gst_object_unref (sinka_target);
gst_object_unref (sinkb_target);
gst_object_unref (src_target);
//g_object_set(atarget, propname, (gdouble) 0, NULL);
//g_object_set(btarget, propname, (gdouble) 0, NULL);
acontroller = gst_object_control_properties (atarget, propname, NULL);
bcontroller = gst_object_control_properties (btarget, propname, NULL);
g_assert (acontroller && bcontroller);
acontrol_source = gst_interpolation_control_source_new ();
gst_controller_set_control_source (acontroller,
propname, GST_CONTROL_SOURCE (acontrol_source));
gst_interpolation_control_source_set_interpolation_mode (acontrol_source,
GST_INTERPOLATE_LINEAR);
bcontrol_source = gst_interpolation_control_source_new ();
gst_controller_set_control_source (bcontroller,
propname, GST_CONTROL_SOURCE (bcontrol_source));
gst_interpolation_control_source_set_interpolation_mode (bcontrol_source,
GST_INTERPOLATE_LINEAR);
self->a_controller = acontroller;
self->b_controller = bcontroller;
self->a_control_source = acontrol_source;
self->b_control_source = bcontrol_source;
return topbin;
}
static void
ges_track_audio_transition_duration_changed (GESTrackObject * object,
guint64 duration)
{
GESTrackAudioTransition *self;
GstElement *gnlobj = object->gnlobject;
GValue zero = { 0, };
GValue one = { 0, };
self = GES_TRACK_AUDIO_TRANSITION (object);
GST_LOG ("updating controller: gnlobj (%p) acontroller(%p) bcontroller(%p)",
gnlobj, self->a_controller, self->b_controller);
if (G_UNLIKELY ((!gnlobj || !self->a_control_source ||
!self->b_control_source)));
return;
GST_INFO ("duration: %" G_GUINT64_FORMAT, duration);
g_value_init (&zero, G_TYPE_DOUBLE);
g_value_init (&one, G_TYPE_DOUBLE);
g_value_set_double (&zero, 0.0);
g_value_set_double (&one, 1.0);
GST_LOG ("setting values on controller");
gst_interpolation_control_source_unset_all (self->a_control_source);
gst_interpolation_control_source_set (self->a_control_source, 0, &one);
gst_interpolation_control_source_set (self->a_control_source,
duration, &zero);
gst_interpolation_control_source_unset_all (self->b_control_source);
gst_interpolation_control_source_set (self->b_control_source, 0, &zero);
gst_interpolation_control_source_set (self->b_control_source, duration, &one);
GST_LOG ("done updating controller");
}
GESTrackAudioTransition *
ges_track_audio_transition_new (void)
{
return g_object_new (GES_TYPE_TRACK_AUDIO_TRANSITION, NULL);
}