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Interface example: a mixer
Original commit message from CVS: Interface example: a mixer
This commit is contained in:
Ronald S. Bultje
parent
2282985957
commit
9620e2ede9
5 changed files with 255 additions and 2 deletions
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@ -1282,6 +1282,7 @@ gst-libs/gst/floatcast/Makefile
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gst-libs/gst/gconf/Makefile
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gst-libs/gst/idct/Makefile
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gst-libs/gst/media-info/Makefile
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gst-libs/gst/mixer/Makefile
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gst-libs/gst/play/Makefile
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gst-libs/gst/resample/Makefile
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gst-libs/gst/riff/Makefile
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@ -5,7 +5,8 @@ GCONF_DIR=
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endif
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SUBDIRS = audio idct resample riff floatcast \
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$(GCONF_DIR) media-info play video
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$(GCONF_DIR) media-info mixer \
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play video
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DIST_SUBDIRS = audio idct resample riff floatcast \
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gconf media-info play video
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gconf media-info mixer play video
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10
gst-libs/gst/mixer/Makefile.am
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10
gst-libs/gst/mixer/Makefile.am
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@ -0,0 +1,10 @@
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lib_LTLIBRARIES = libgstmixer.la
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libgstmixer_la_SOURCES = mixer.c
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libgstmixerincludedir = $(includedir)/gstreamer-@GST_MAJORMINOR@/gst/mixer
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libgstmixerinclude_HEADERS = mixer.h
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libgstmixer_la_LIBADD =
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libgstmixer_la_CFLAGS = $(GST_CFLAGS) $(GST_OPT_CFLAGS)
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libgstmixer_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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134
gst-libs/gst/mixer/mixer.c
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134
gst-libs/gst/mixer/mixer.c
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@ -0,0 +1,134 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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*
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* mixer.c: mixer design virtual class function wrappers
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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 <gst/mixer/mixer.h>
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static void gst_mixer_class_init (GstMixerClass *klass);
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GType
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gst_mixer_get_type (void)
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{
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static GType gst_mixer_type = 0;
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if (!gst_mixer_type) {
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static const GTypeInfo gst_mixer_info = {
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sizeof (GstMixerClass),
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(GBaseInitFunc) gst_mixer_class_init,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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};
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gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstMixer",
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&gst_mixer_info, 0);
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g_type_interface_add_prerequisite (gst_mixer_type,
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GST_TYPE_INTERFACE);
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}
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return gst_mixer_type;
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}
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static void
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gst_mixer_class_init (GstMixerClass *klass)
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{
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/* default virtual functions */
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klass->list_channels = NULL;
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klass->set_volume = NULL;
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klass->get_volume = NULL;
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klass->set_mute = NULL;
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klass->set_record = NULL;
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}
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const GList *
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gst_mixer_list_channels (GstMixer *mixer)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->list_channels) {
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return klass->list_channels (mixer);
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}
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return NULL;
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}
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void
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gst_mixer_set_volume (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_volume) {
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klass->set_volume (mixer, channel, volumes);
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}
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}
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void
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gst_mixer_get_volume (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->get_volume) {
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klass->get_volume (mixer, channel, volumes);
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} else {
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gint i;
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for (i = 0; i < channel->num_channels; i++) {
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volumes[i] = 0;
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}
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}
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}
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void
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gst_mixer_set_mute (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean mute)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_mute) {
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klass->set_mute (mixer, channel, mute);
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}
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}
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void
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gst_mixer_set_record (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean record)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_record) {
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klass->set_record (mixer, channel, record);
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}
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}
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107
gst-libs/gst/mixer/mixer.h
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107
gst-libs/gst/mixer/mixer.h
Normal file
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@ -0,0 +1,107 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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*
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* mixer.h: mixer interface design
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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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#ifndef __GST_MIXER_H__
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#define __GST_MIXER_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define GST_TYPE_MIXER \
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(gst_mixer_get_type ())
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#define GST_MIXER(obj) \
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(GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MIXER, GstMixer))
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#define GST_MIXER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MIXER, GstMixerClass))
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#define GST_IS_MIXER(obj) \
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(GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MIXER))
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#define GST_IS_MIXER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MIXER))
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#define GST_MIXER_GET_CLASS(inst) \
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(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_MIXER, GstMixerClass))
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/* I fully realise that this naming being used here is confusing.
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* A channel is referred to both as the number of simultaneous
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* sound streams the input can handle as well as the in-/output
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* itself. We need to fix this some day, I just cannot come up
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* with something better.
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*/
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#define GST_MIXER_CHANNEL_INPUT (1<<0)
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#define GST_MIXER_CHANNEL_OUTPUT (1<<1)
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#define GST_MIXER_CHANNEL_MUTE (1<<2)
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#define GST_MIXER_CHANNEL_RECORD (1<<3)
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typedef struct _GstMixerChannel {
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gchar *label;
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gint num_channels,
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flags,
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min_volume, max_volume;
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} GstMixerChannel;
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#define GST_MIXER_CHANNEL_HAS_FLAG(channel, flag) \
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((channel)->flags & flag)
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typedef struct _GstMixer GstMixer;
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typedef struct _GstMixerClass {
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GTypeInterface klass;
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/* virtual functions */
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const GList * (* list_channels) (GstMixer *mixer);
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void (* set_volume) (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes);
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void (* get_volume) (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes);
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void (* set_mute) (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean mute);
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void (* set_record) (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean record);
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} GstMixerClass;
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GType gst_mixer_get_type (void);
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/* virtual class function wrappers */
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const GList * gst_mixer_list_channels (GstMixer *mixer);
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void gst_mixer_set_volume (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes);
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void gst_mixer_get_volume (GstMixer *mixer,
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GstMixerChannel *channel,
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gint *volumes);
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void gst_mixer_set_mute (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean mute);
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void gst_mixer_set_record (GstMixer *mixer,
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GstMixerChannel *channel,
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gboolean record);
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G_END_DECLS
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#endif /* __GST_MIXER_H__ */
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