gstreamer/ges/ges-audio-transition.c
Tim-Philipp Müller a7347ca8f7 WIP: ges: fix API export/import and 'inconsistent linkage' on MSVC
Export GES library API in headers when we're building the
library itself, otherwise import the API from the headers.

This fixes linker warnings on Windows when building with MSVC.

Fix up some missing config.h includes when building the lib which
is needed to get the export api define from config.h

Fixes https://gitlab.freedesktop.org/gstreamer/gst-editing-services/issues/42
2018-12-15 00:14:51 +00:00

298 lines
9 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gesaudiotransition
* @title: GESAudioTransition
* @short_description: implements audio crossfade transition
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ges-internal.h"
#include "ges-track-element.h"
#include "ges-audio-transition.h"
#include <gst/controller/gstdirectcontrolbinding.h>
struct _GESAudioTransitionPrivate
{
/* these enable volume interpolation. Unlike video, both inputs are adjusted
* simultaneously */
GstControlSource *a_control_source;
GstControlSource *b_control_source;
};
enum
{
PROP_0,
};
G_DEFINE_TYPE_WITH_PRIVATE (GESAudioTransition, ges_audio_transition,
GES_TYPE_TRANSITION);
#define fast_element_link(a,b) gst_element_link_pads_full((a),"src",(b),"sink",GST_PAD_LINK_CHECK_NOTHING)
static void
ges_audio_transition_duration_changed (GESTrackElement * self, guint64);
static GstElement *ges_audio_transition_create_element (GESTrackElement * self);
static void ges_audio_transition_dispose (GObject * object);
static void ges_audio_transition_finalize (GObject * object);
static void ges_audio_transition_get_property (GObject * object, guint
property_id, GValue * value, GParamSpec * pspec);
static void ges_audio_transition_set_property (GObject * object, guint
property_id, const GValue * value, GParamSpec * pspec);
static void
duration_changed_cb (GESTrackElement * self, GParamSpec * arg G_GNUC_UNUSED)
{
ges_audio_transition_duration_changed (self,
ges_timeline_element_get_duration (GES_TIMELINE_ELEMENT (self)));
}
static void
ges_audio_transition_class_init (GESAudioTransitionClass * klass)
{
GObjectClass *object_class;
GESTrackElementClass *toclass;
object_class = G_OBJECT_CLASS (klass);
toclass = GES_TRACK_ELEMENT_CLASS (klass);
object_class->get_property = ges_audio_transition_get_property;
object_class->set_property = ges_audio_transition_set_property;
object_class->dispose = ges_audio_transition_dispose;
object_class->finalize = ges_audio_transition_finalize;
toclass->create_element = ges_audio_transition_create_element;
}
static void
ges_audio_transition_init (GESAudioTransition * self)
{
self->priv = ges_audio_transition_get_instance_private (self);
}
static void
ges_audio_transition_dispose (GObject * object)
{
GESAudioTransition *self;
self = GES_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_signal_handlers_disconnect_by_func (GES_TRACK_ELEMENT (self),
duration_changed_cb, NULL);
G_OBJECT_CLASS (ges_audio_transition_parent_class)->dispose (object);
}
static void
ges_audio_transition_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_audio_transition_parent_class)->finalize (object);
}
static void
ges_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_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);
GstElement *resample = gst_element_factory_make ("audioresample", NULL);
gst_bin_add (bin, volume);
gst_bin_add (bin, resample);
if (!fast_element_link (element, volume) ||
!fast_element_link (volume, resample) ||
!gst_element_link_pads_full (resample, "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_audio_transition_create_element (GESTrackElement * track_element)
{
GESAudioTransition *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;
guint64 duration;
GstControlSource *acontrol_source, *bcontrol_source;
self = GES_AUDIO_TRANSITION (track_element);
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 ("audiomixer", 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 ();
g_object_set (acontrol_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
bcontrol_source = gst_interpolation_control_source_new ();
g_object_set (bcontrol_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
self->priv->a_control_source = acontrol_source;
self->priv->b_control_source = bcontrol_source;
duration =
ges_timeline_element_get_duration (GES_TIMELINE_ELEMENT (track_element));
ges_audio_transition_duration_changed (track_element, duration);
g_signal_connect (track_element, "notify::duration",
G_CALLBACK (duration_changed_cb), NULL);
gst_object_add_control_binding (GST_OBJECT (atarget),
gst_direct_control_binding_new (GST_OBJECT (atarget), propname,
acontrol_source));
gst_object_add_control_binding (GST_OBJECT (btarget),
gst_direct_control_binding_new (GST_OBJECT (btarget), propname,
bcontrol_source));
self->priv->a_control_source = acontrol_source;
self->priv->b_control_source = bcontrol_source;
return topbin;
}
static void
ges_audio_transition_duration_changed (GESTrackElement * track_element,
guint64 duration)
{
GESAudioTransition *self;
GstElement *nleobj = ges_track_element_get_nleobject (track_element);
GstTimedValueControlSource *ta, *tb;
self = GES_AUDIO_TRANSITION (track_element);
GST_INFO ("updating controller: nleobj (%p)", nleobj);
if (G_UNLIKELY ((!self->priv->a_control_source ||
!self->priv->b_control_source)))
return;
GST_INFO ("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_unset_all (tb);
/* The volume property goes from 0 to 10, so we want to interpolate between
* 0 and 0.1 */
gst_timed_value_control_source_set (ta, 0, 0.1);
gst_timed_value_control_source_set (ta, duration, 0.0);
gst_timed_value_control_source_set (tb, 0, 0.0);
gst_timed_value_control_source_set (tb, duration, 0.1);
GST_INFO ("done updating controller");
}
/**
* ges_audio_transition_new:
*
* Creates a new #GESAudioTransition.
*
* Returns: (transfer floating): The newly created #GESAudioTransition.
*/
GESAudioTransition *
ges_audio_transition_new (void)
{
return g_object_new (GES_TYPE_AUDIO_TRANSITION, "track-type",
GES_TRACK_TYPE_AUDIO, NULL);
}