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6665c3084c
Original commit message from CVS: 2005-09-02 Andy Wingo <wingo@pobox.com> * All plugins updated for element state changes.
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* ALSA mixer implementation.
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* Copyright (C) 2003 Leif Johnson <leif@ambient.2y.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstalsamixerelement.h"
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static GstElementDetails gst_alsa_mixer_element_details =
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GST_ELEMENT_DETAILS ("Alsa Mixer",
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"Generic/Audio",
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"Control sound input and output levels with ALSA",
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"Leif Johnson <leif@ambient.2y.net>");
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GST_BOILERPLATE_WITH_INTERFACE (GstAlsaMixerElement, gst_alsa_mixer_element,
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GstElement, GST_TYPE_ELEMENT, GstMixer, GST_TYPE_MIXER,
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gst_alsa_mixer_element);
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GST_IMPLEMENT_ALSA_MIXER_METHODS (GstAlsaMixerElement, gst_alsa_mixer_element);
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static GstStateChangeReturn gst_alsa_mixer_element_change_state (GstElement *
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element, GstStateChange transition);
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static void
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gst_alsa_mixer_element_base_init (gpointer klass)
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{
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gst_element_class_set_details (GST_ELEMENT_CLASS (klass),
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&gst_alsa_mixer_element_details);
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}
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static void
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gst_alsa_mixer_element_class_init (GstAlsaMixerElementClass * klass)
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{
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GstElementClass *element_class;
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element_class = (GstElementClass *) klass;
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element_class->change_state = gst_alsa_mixer_element_change_state;
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}
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static void
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gst_alsa_mixer_element_init (GstAlsaMixerElement * this,
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GstAlsaMixerElementClass * klass)
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{
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this->mixer = NULL;
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}
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static GstStateChangeReturn
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gst_alsa_mixer_element_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstAlsaMixerElement *this = GST_ALSA_MIXER_ELEMENT (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!this->mixer) {
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this->mixer = gst_alsa_mixer_new ("hw:0", GST_ALSA_MIXER_ALL);
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}
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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if (this->mixer) {
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gst_alsa_mixer_free (this->mixer);
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this->mixer = NULL;
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}
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break;
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default:
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break;
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}
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if (GST_ELEMENT_CLASS (parent_class)->change_state)
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return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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return GST_STATE_CHANGE_SUCCESS;
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}
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