mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-21 07:46:38 +00:00
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
|
/* ALSA mixer implementation.
|
||
|
|
* Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include "config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "gstalsamixerelement.h"
|
||
|
|
|
||
|
|
|
||
|
|
static GstElementDetails gst_alsa_mixer_element_details =
|
||
|
|
GST_ELEMENT_DETAILS ("Alsa Mixer",
|
||
|
|
"Generic/Audio",
|
||
|
|
"Control sound input and output levels with ALSA",
|
||
|
|
"Leif Johnson <leif@ambient.2y.net>");
|
||
|
|
|
||
|
|
|
||
|
|
GST_BOILERPLATE_WITH_INTERFACE (GstAlsaMixerElement, gst_alsa_mixer_element,
|
||
|
|
GstElement, GST_TYPE_ELEMENT, GstMixer, GST_TYPE_MIXER,
|
||
|
|
gst_alsa_mixer_element);
|
||
|
|
|
||
|
|
GST_IMPLEMENT_ALSA_MIXER_METHODS (GstAlsaMixerElement, gst_alsa_mixer_element);
|
||
|
|
|
||
|
|
static GstElementStateReturn gst_alsa_mixer_element_change_state (GstElement *
|
||
|
|
element);
|
||
|
|
|
||
|
|
static void
|
||
|
|
gst_alsa_mixer_element_base_init (gpointer klass)
|
||
|
|
{
|
||
|
|
gst_element_class_set_details (GST_ELEMENT_CLASS (klass),
|
||
|
|
&gst_alsa_mixer_element_details);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
|
||
|
|
{
|
||
|
|
GstElementClass *element_class;
|
||
|
|
|
||
|
|
element_class = (GstElementClass *) klass;
|
||
|
|
|
||
|
|
element_class->change_state = gst_alsa_mixer_element_change_state;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gst_alsa_mixer_element_init (GstAlsaMixerElement * this)
|
||
|
|
{
|
||
|
|
this->mixer = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
static GstElementStateReturn
|
||
|
|
gst_alsa_mixer_element_change_state (GstElement * element)
|
||
|
|
{
|
||
|
|
GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
|
||
|
|
|
||
|
|
switch (GST_STATE_TRANSITION (element)) {
|
||
|
|
case GST_STATE_NULL_TO_READY:
|
||
|
|
if (!this->mixer) {
|
||
|
|
this->mixer = gst_alsa_mixer_new ("hw:0", GST_ALSA_MIXER_ALL);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case GST_STATE_READY_TO_NULL:
|
||
|
|
if (this->mixer) {
|
||
|
|
gst_alsa_mixer_free (this->mixer);
|
||
|
|
this->mixer = NULL;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (GST_ELEMENT_CLASS (parent_class)->change_state)
|
||
|
|
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
|
||
|
|
|
||
|
|
return GST_STATE_SUCCESS;
|
||
|
|
}
|