gstreamer/sys/oss4/oss4-mixer.h

129 lines
5.4 KiB
C
Raw Normal View History

/* GStreamer OSS4 mixer implementation
* Copyright (C) 2007-2008 Tim-Philipp Müller <tim centricular 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.
*/
#ifndef OSS4_MIXER_H
#define OSS4_MIXER_H
#include <gst/gst.h>
#include "oss4-soundcard.h"
#define GST_OSS4_MIXER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OSS4_MIXER,GstOss4Mixer))
#define GST_OSS4_MIXER_CAST(obj) ((GstOss4Mixer *)(obj))
#define GST_OSS4_MIXER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OSS4_MIXER,GstOss4MixerClass))
#define GST_IS_OSS4_MIXER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OSS4_MIXER))
#define GST_IS_OSS4_MIXER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OSS4_MIXER))
#define GST_TYPE_OSS4_MIXER (gst_oss4_mixer_get_type())
#define GST_OSS4_MIXER_IS_OPEN(obj) (GST_OSS4_MIXER(obj)->fd != -1)
typedef struct _GstOss4Mixer GstOss4Mixer;
typedef struct _GstOss4MixerClass GstOss4MixerClass;
struct _GstOss4Mixer {
GstElement element;
/*< private >*/
/* element bits'n'bops */
gchar * device;
/* mixer details */
gint fd; /* file descriptor if open, or -1 */
gchar * device_name; /* device description, or NULL */
gchar * open_device; /* the device we opened */
GList * tracks; /* list of available tracks */
GList * controls; /* list of available controls */
gboolean need_update; /* re-read list of available tracks? */
oss_mixext last_mixext; /* we keep this around so we can
* easily check if the mixer
* interface has changed */
GThread * watch_thread; /* thread watching for value changes */
GCond * watch_cond;
gint watch_shutdown;
gint modify_counter; /* from MIXERINFO */
/* for property probe interface */
GList * property_probe_list;
};
struct _GstOss4MixerClass {
GstElementClass element_class;
};
/* helper struct holding info about one control */
typedef struct _GstOss4MixerControl GstOss4MixerControl;
struct _GstOss4MixerControl {
oss_mixext mixext;
GstOss4MixerControl *parent; /* NULL if root */
GstOss4MixerControl *mute; /* sibling with mute function, or NULL */
GList *mute_group; /* group of mute controls, or NULL */
GList *children; /* GstOss4MixerControls (no ownership) */
GQuark *enum_vals; /* 0-terminated array of values or NULL */
int enum_version; /* 0 = list won't change */
int last_val; /* last value seen */
gboolean is_virtual : 1; /* is a vmix control with dynamic label */
gboolean is_master : 1;
gboolean is_slider : 1; /* represent as slider */
gboolean is_switch : 1; /* represent as switch */
gboolean is_enum : 1; /* represent as combo/enumeration */
gboolean no_list : 1; /* enumeration with no list available */
gboolean is_input : 1; /* is an input-related control */
gboolean is_output : 1; /* is an output-related control */
gboolean used : 1; /* whether we know what to do with this */
gboolean changed : 1; /* transient flag used by watch thread */
gboolean list_changed : 1; /* transient flag used by watch thread */
};
/* header says parent=-1 means root, but it can also be parent=ctrl */
#define MIXEXT_IS_ROOT(me) ((me).parent == -1 || (me).parent == (me).ctrl)
#define MIXEXT_IS_SLIDER(me) ((me).type == MIXT_MONOSLIDER || \
(me).type == MIXT_STEREOSLIDER || (me).type == MIXT_MONOSLIDER16 || \
(me).type == MIXT_STEREOSLIDER16 || (me).type == MIXT_SLIDER)
#define MIXEXT_HAS_DESCRIPTION(me) (((me).flags & MIXF_DESCR) != 0)
#define MIXEXT_ENUM_IS_AVAILABLE(me,num) \
(((me).enum_present[num/8]) & (1 << (num % 8)))
GType gst_oss4_mixer_get_type (void);
gboolean gst_oss4_mixer_get_control_val (GstOss4Mixer * mixer,
GstOss4MixerControl * mc,
int * val);
gboolean gst_oss4_mixer_set_control_val (GstOss4Mixer * mixer,
GstOss4MixerControl * mc,
int val);
G_END_DECLS
#endif /* OSS4_MIXER_H */