/* GStreamer Editing Services * Copyright (C) 2010 Brandon Lewis * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:ges-track-audio-transition * @short_description: implements audio crossfade transition */ #include "ges-internal.h" #include "ges-track-element.h" #include "ges-track-audio-transition.h" #include G_DEFINE_TYPE (GESTrackAudioTransition, ges_track_audio_transition, GES_TYPE_TRACK_TRANSITION); struct _GESTrackAudioTransitionPrivate { /* these enable volume interpolation. Unlike video, both inputs are adjusted * simultaneously */ GstControlSource *a_control_source; GstControlSource *b_control_source; }; 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 (GESTrackElement * self, guint64); static GstElement *ges_track_audio_transition_create_element (GESTrackElement * 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; GESTrackElementClass *toclass; g_type_class_add_private (klass, sizeof (GESTrackAudioTransitionPrivate)); object_class = G_OBJECT_CLASS (klass); toclass = GES_TRACK_ELEMENT_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; toclass->create_element = ges_track_audio_transition_create_element; } static void ges_track_audio_transition_init (GESTrackAudioTransition * self) { self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GES_TYPE_TRACK_AUDIO_TRANSITION, GESTrackAudioTransitionPrivate); } static void ges_track_audio_transition_dispose (GObject * object) { GESTrackAudioTransition *self; self = GES_TRACK_AUDIO_TRANSITION (object); if (self->priv->a_control_source) { if (self->priv->a_control_source) gst_object_unref (self->priv->a_control_source); self->priv->a_control_source = NULL; } if (self->priv->b_control_source) { if (self->priv->b_control_source) gst_object_unref (self->priv->b_control_source); self->priv->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_%u", 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 (GESTrackElement * 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; GstControlSource *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); acontrol_source = gst_interpolation_control_source_new (); gst_object_add_control_binding (GST_OBJECT (atarget), gst_direct_control_binding_new (GST_OBJECT (atarget), propname, acontrol_source)); g_object_set (acontrol_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL); bcontrol_source = gst_interpolation_control_source_new (); gst_object_add_control_binding (GST_OBJECT (btarget), gst_direct_control_binding_new (GST_OBJECT (btarget), propname, bcontrol_source)); g_object_set (acontrol_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL); self->priv->a_control_source = acontrol_source; self->priv->b_control_source = bcontrol_source; return topbin; } static void ges_track_audio_transition_duration_changed (GESTrackElement * object, guint64 duration) { GESTrackAudioTransition *self; GstElement *gnlobj = ges_track_element_get_gnlobject (object); GstTimedValueControlSource *ta, *tb; self = GES_TRACK_AUDIO_TRANSITION (object); GST_LOG ("updating controller: gnlobj (%p)", gnlobj); if (G_UNLIKELY ((!gnlobj || !self->priv->a_control_source || !self->priv->b_control_source))) return; GST_INFO ("duration: %" G_GUINT64_FORMAT, duration); GST_LOG ("setting values on controller"); ta = GST_TIMED_VALUE_CONTROL_SOURCE (self->priv->a_control_source); tb = GST_TIMED_VALUE_CONTROL_SOURCE (self->priv->b_control_source); gst_timed_value_control_source_unset_all (ta); gst_timed_value_control_source_set (ta, 0, 1.0); gst_timed_value_control_source_set (ta, duration, 0.0); gst_timed_value_control_source_unset_all (tb); gst_timed_value_control_source_set (tb, 0, 0.0); gst_timed_value_control_source_set (tb, duration, 1.0); GST_LOG ("done updating controller"); } /** * ges_track_audio_transition_new: * * Creates a new #GESTrackAudioTransition. * * Returns: The newly created #GESTrackAudioTransition. */ GESTrackAudioTransition * ges_track_audio_transition_new (void) { return g_object_new (GES_TYPE_TRACK_AUDIO_TRANSITION, "track-type", GES_TRACK_TYPE_AUDIO, NULL); }