From 9620e2ede907b9445bf2393b99117ad1db4f86e9 Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Sat, 13 Sep 2003 01:20:04 +0000 Subject: Interface example: a mixer Original commit message from CVS: Interface example: a mixer --- gst-libs/gst/mixer/Makefile.am | 10 +++ gst-libs/gst/mixer/mixer.c | 134 +++++++++++++++++++++++++++++++++++++++++ gst-libs/gst/mixer/mixer.h | 107 ++++++++++++++++++++++++++++++++ 3 files changed, 251 insertions(+) create mode 100644 gst-libs/gst/mixer/Makefile.am create mode 100644 gst-libs/gst/mixer/mixer.c create mode 100644 gst-libs/gst/mixer/mixer.h (limited to 'gst-libs/gst/mixer') diff --git a/gst-libs/gst/mixer/Makefile.am b/gst-libs/gst/mixer/Makefile.am new file mode 100644 index 00000000..de67658f --- /dev/null +++ b/gst-libs/gst/mixer/Makefile.am @@ -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) diff --git a/gst-libs/gst/mixer/mixer.c b/gst-libs/gst/mixer/mixer.c new file mode 100644 index 00000000..3e6ce63b --- /dev/null +++ b/gst-libs/gst/mixer/mixer.c @@ -0,0 +1,134 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen + * 2000 Wim Taymans + * + * 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 + +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); + } +} diff --git a/gst-libs/gst/mixer/mixer.h b/gst-libs/gst/mixer/mixer.h new file mode 100644 index 00000000..dab226e4 --- /dev/null +++ b/gst-libs/gst/mixer/mixer.h @@ -0,0 +1,107 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen + * 2000 Wim Taymans + * + * 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 + +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__ */ -- cgit v1.2.1