Interface example: a mixer

Original commit message from CVS:
Interface example: a mixer
This commit is contained in:
Ronald S. Bultje 2003-09-13 01:20:04 +00:00
parent 35989ae8d4
commit beea17989f
7 changed files with 496 additions and 2 deletions

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@ -1282,6 +1282,7 @@ gst-libs/gst/floatcast/Makefile
gst-libs/gst/gconf/Makefile
gst-libs/gst/idct/Makefile
gst-libs/gst/media-info/Makefile
gst-libs/gst/mixer/Makefile
gst-libs/gst/play/Makefile
gst-libs/gst/resample/Makefile
gst-libs/gst/riff/Makefile

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@ -5,7 +5,8 @@ GCONF_DIR=
endif
SUBDIRS = audio idct resample riff floatcast \
$(GCONF_DIR) media-info play video
$(GCONF_DIR) media-info mixer \
play video
DIST_SUBDIRS = audio idct resample riff floatcast \
gconf media-info play video
gconf media-info mixer play video

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@ -0,0 +1,134 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* mixer.c: mixer design virtual class function wrappers
*
* 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 <gst/mixer/mixer.h>
static void gst_mixer_class_init (GstMixerClass *klass);
GType
gst_mixer_get_type (void)
{
static GType gst_mixer_type = 0;
if (!gst_mixer_type) {
static const GTypeInfo gst_mixer_info = {
sizeof (GstMixerClass),
(GBaseInitFunc) gst_mixer_class_init,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
};
gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,
"GstMixer",
&gst_mixer_info, 0);
g_type_interface_add_prerequisite (gst_mixer_type,
GST_TYPE_INTERFACE);
}
return gst_mixer_type;
}
static void
gst_mixer_class_init (GstMixerClass *klass)
{
/* default virtual functions */
klass->list_channels = NULL;
klass->set_volume = NULL;
klass->get_volume = NULL;
klass->set_mute = NULL;
klass->set_record = NULL;
}
const GList *
gst_mixer_list_channels (GstMixer *mixer)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->list_channels) {
return klass->list_channels (mixer);
}
return NULL;
}
void
gst_mixer_set_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_volume) {
klass->set_volume (mixer, channel, volumes);
}
}
void
gst_mixer_get_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->get_volume) {
klass->get_volume (mixer, channel, volumes);
} else {
gint i;
for (i = 0; i < channel->num_channels; i++) {
volumes[i] = 0;
}
}
}
void
gst_mixer_set_mute (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_mute) {
klass->set_mute (mixer, channel, mute);
}
}
void
gst_mixer_set_record (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_record) {
klass->set_record (mixer, channel, record);
}
}

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@ -0,0 +1,107 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* mixer.h: mixer interface design
*
* 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.
*/
#ifndef __GST_MIXER_H__
#define __GST_MIXER_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_MIXER \
(gst_mixer_get_type ())
#define GST_MIXER(obj) \
(GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MIXER, GstMixer))
#define GST_MIXER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MIXER, GstMixerClass))
#define GST_IS_MIXER(obj) \
(GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MIXER))
#define GST_IS_MIXER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MIXER))
#define GST_MIXER_GET_CLASS(inst) \
(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_MIXER, GstMixerClass))
/* I fully realise that this naming being used here is confusing.
* A channel is referred to both as the number of simultaneous
* sound streams the input can handle as well as the in-/output
* itself. We need to fix this some day, I just cannot come up
* with something better.
*/
#define GST_MIXER_CHANNEL_INPUT (1<<0)
#define GST_MIXER_CHANNEL_OUTPUT (1<<1)
#define GST_MIXER_CHANNEL_MUTE (1<<2)
#define GST_MIXER_CHANNEL_RECORD (1<<3)
typedef struct _GstMixerChannel {
gchar *label;
gint num_channels,
flags,
min_volume, max_volume;
} GstMixerChannel;
#define GST_MIXER_CHANNEL_HAS_FLAG(channel, flag) \
((channel)->flags & flag)
typedef struct _GstMixer GstMixer;
typedef struct _GstMixerClass {
GTypeInterface klass;
/* virtual functions */
const GList * (* list_channels) (GstMixer *mixer);
void (* set_volume) (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void (* get_volume) (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void (* set_mute) (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute);
void (* set_record) (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record);
} GstMixerClass;
GType gst_mixer_get_type (void);
/* virtual class function wrappers */
const GList * gst_mixer_list_channels (GstMixer *mixer);
void gst_mixer_set_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void gst_mixer_get_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void gst_mixer_set_mute (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute);
void gst_mixer_set_record (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record);
G_END_DECLS
#endif /* __GST_MIXER_H__ */

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@ -0,0 +1,10 @@
lib_LTLIBRARIES = libgstmixer.la
libgstmixer_la_SOURCES = mixer.c
libgstmixerincludedir = $(includedir)/gstreamer-@GST_MAJORMINOR@/gst/mixer
libgstmixerinclude_HEADERS = mixer.h
libgstmixer_la_LIBADD =
libgstmixer_la_CFLAGS = $(GST_CFLAGS) $(GST_OPT_CFLAGS)
libgstmixer_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

134
gst-libs/gst/mixer/mixer.c Normal file
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@ -0,0 +1,134 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* mixer.c: mixer design virtual class function wrappers
*
* 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 <gst/mixer/mixer.h>
static void gst_mixer_class_init (GstMixerClass *klass);
GType
gst_mixer_get_type (void)
{
static GType gst_mixer_type = 0;
if (!gst_mixer_type) {
static const GTypeInfo gst_mixer_info = {
sizeof (GstMixerClass),
(GBaseInitFunc) gst_mixer_class_init,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
};
gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,
"GstMixer",
&gst_mixer_info, 0);
g_type_interface_add_prerequisite (gst_mixer_type,
GST_TYPE_INTERFACE);
}
return gst_mixer_type;
}
static void
gst_mixer_class_init (GstMixerClass *klass)
{
/* default virtual functions */
klass->list_channels = NULL;
klass->set_volume = NULL;
klass->get_volume = NULL;
klass->set_mute = NULL;
klass->set_record = NULL;
}
const GList *
gst_mixer_list_channels (GstMixer *mixer)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->list_channels) {
return klass->list_channels (mixer);
}
return NULL;
}
void
gst_mixer_set_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_volume) {
klass->set_volume (mixer, channel, volumes);
}
}
void
gst_mixer_get_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->get_volume) {
klass->get_volume (mixer, channel, volumes);
} else {
gint i;
for (i = 0; i < channel->num_channels; i++) {
volumes[i] = 0;
}
}
}
void
gst_mixer_set_mute (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_mute) {
klass->set_mute (mixer, channel, mute);
}
}
void
gst_mixer_set_record (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record)
{
GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
if (klass->set_record) {
klass->set_record (mixer, channel, record);
}
}

107
gst-libs/gst/mixer/mixer.h Normal file
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@ -0,0 +1,107 @@
/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* mixer.h: mixer interface design
*
* 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.
*/
#ifndef __GST_MIXER_H__
#define __GST_MIXER_H__
#include <gst/gst.h>
G_BEGIN_DECLS
#define GST_TYPE_MIXER \
(gst_mixer_get_type ())
#define GST_MIXER(obj) \
(GST_INTERFACE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_MIXER, GstMixer))
#define GST_MIXER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_MIXER, GstMixerClass))
#define GST_IS_MIXER(obj) \
(GST_INTERFACE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_MIXER))
#define GST_IS_MIXER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_MIXER))
#define GST_MIXER_GET_CLASS(inst) \
(G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_MIXER, GstMixerClass))
/* I fully realise that this naming being used here is confusing.
* A channel is referred to both as the number of simultaneous
* sound streams the input can handle as well as the in-/output
* itself. We need to fix this some day, I just cannot come up
* with something better.
*/
#define GST_MIXER_CHANNEL_INPUT (1<<0)
#define GST_MIXER_CHANNEL_OUTPUT (1<<1)
#define GST_MIXER_CHANNEL_MUTE (1<<2)
#define GST_MIXER_CHANNEL_RECORD (1<<3)
typedef struct _GstMixerChannel {
gchar *label;
gint num_channels,
flags,
min_volume, max_volume;
} GstMixerChannel;
#define GST_MIXER_CHANNEL_HAS_FLAG(channel, flag) \
((channel)->flags & flag)
typedef struct _GstMixer GstMixer;
typedef struct _GstMixerClass {
GTypeInterface klass;
/* virtual functions */
const GList * (* list_channels) (GstMixer *mixer);
void (* set_volume) (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void (* get_volume) (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void (* set_mute) (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute);
void (* set_record) (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record);
} GstMixerClass;
GType gst_mixer_get_type (void);
/* virtual class function wrappers */
const GList * gst_mixer_list_channels (GstMixer *mixer);
void gst_mixer_set_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void gst_mixer_get_volume (GstMixer *mixer,
GstMixerChannel *channel,
gint *volumes);
void gst_mixer_set_mute (GstMixer *mixer,
GstMixerChannel *channel,
gboolean mute);
void gst_mixer_set_record (GstMixer *mixer,
GstMixerChannel *channel,
gboolean record);
G_END_DECLS
#endif /* __GST_MIXER_H__ */