gstreamer/ges/ges-audio-test-source.c
Simon Corsin a635e48d77 GES: Add GESVideoSource and GESAudioSource base classes
+ Update documentation.
  + Implements subclasses audio-uri-source and video-uri-source
2013-09-03 20:22:32 -04:00

213 lines
5.6 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:ges-audio-test-source
* @short_description: produce a simple test waveform or silence
*
* Outputs a test audio stream using audiotestsrc. The default property values
* output silence. Useful for testing pipelines, or to fill gaps in an audio
* track.
*/
#include "ges-internal.h"
#include "ges-track-element.h"
#include "ges-audio-test-source.h"
G_DEFINE_TYPE (GESAudioTestSource, ges_audio_test_source,
GES_TYPE_AUDIO_SOURCE);
#define DEFAULT_VOLUME 1.0
struct _GESAudioTestSourcePrivate
{
gdouble freq;
gdouble volume;
};
enum
{
PROP_0,
};
static void ges_audio_test_source_get_property (GObject * object, guint
property_id, GValue * value, GParamSpec * pspec);
static void ges_audio_test_source_set_property (GObject * object, guint
property_id, const GValue * value, GParamSpec * pspec);
static GstElement *ges_audio_test_source_create_source (GESTrackElement * self);
static void
ges_audio_test_source_class_init (GESAudioTestSourceClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESAudioSourceClass *source_class = GES_AUDIO_SOURCE_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESAudioTestSourcePrivate));
object_class->get_property = ges_audio_test_source_get_property;
object_class->set_property = ges_audio_test_source_set_property;
source_class->create_source = ges_audio_test_source_create_source;
}
static void
ges_audio_test_source_init (GESAudioTestSource * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_AUDIO_TEST_SOURCE, GESAudioTestSourcePrivate);
self->priv->freq = 440;
self->priv->volume = DEFAULT_VOLUME;
}
static void
ges_audio_test_source_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_test_source_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_audio_test_source_create_source (GESTrackElement * trksrc)
{
GESAudioTestSource *self;
GstElement *ret;
const gchar *props[] = { "volume", "freq", NULL };
self = (GESAudioTestSource *) trksrc;
ret = gst_element_factory_make ("audiotestsrc", NULL);
g_object_set (ret, "volume", (gdouble) self->priv->volume, "freq", (gdouble)
self->priv->freq, NULL);
ges_track_element_add_children_props (trksrc, ret, NULL, NULL, props);
return ret;
}
/**
* ges_audio_test_source_set_freq:
* @self: a #GESAudioTestSource
* @freq: The frequency you want to apply on @self
*
* Lets you set the frequency applied on the track element
*/
void
ges_audio_test_source_set_freq (GESAudioTestSource * self, gdouble freq)
{
GstElement *element =
ges_track_element_get_element (GES_TRACK_ELEMENT (self));
self->priv->freq = freq;
if (element) {
GValue val = { 0 };
g_value_init (&val, G_TYPE_DOUBLE);
g_value_set_double (&val, freq);
ges_track_element_set_child_property (GES_TRACK_ELEMENT (self), "freq",
&val);
}
}
/**
* ges_audio_test_source_set_volume:
* @self: a #GESAudioTestSource
* @volume: The volume you want to apply on @self
*
* Sets the volume of the test audio signal.
*/
void
ges_audio_test_source_set_volume (GESAudioTestSource * self, gdouble volume)
{
GstElement *element =
ges_track_element_get_element (GES_TRACK_ELEMENT (self));
self->priv->volume = volume;
if (element) {
GValue val = { 0 };
g_value_init (&val, G_TYPE_DOUBLE);
g_value_set_double (&val, volume);
ges_track_element_set_child_property (GES_TRACK_ELEMENT (self), "volume",
&val);
}
}
/**
* ges_audio_test_source_get_freq:
* @self: a #GESAudioTestSource
*
* Get the current frequency of @self.
*
* Returns: The current frequency of @self.
*/
double
ges_audio_test_source_get_freq (GESAudioTestSource * self)
{
GValue val = { 0 };
ges_track_element_get_child_property (GES_TRACK_ELEMENT (self), "freq", &val);
return g_value_get_double (&val);
}
/**
* ges_audio_test_source_get_volume:
* @self: a #GESAudioTestSource
*
* Get the current volume of @self.
*
* Returns: The current volume of @self
*/
double
ges_audio_test_source_get_volume (GESAudioTestSource * self)
{
GValue val = { 0 };
ges_track_element_get_child_property (GES_TRACK_ELEMENT (self), "volume",
&val);
return g_value_get_double (&val);
}
/**
* ges_audio_test_source_new:
*
* Creates a new #GESAudioTestSource.
*
* Returns: The newly created #GESAudioTestSource.
*/
GESAudioTestSource *
ges_audio_test_source_new (void)
{
return g_object_new (GES_TYPE_AUDIO_TEST_SOURCE, "track-type",
GES_TRACK_TYPE_AUDIO, NULL);
}