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diff --git a/include/alsa/mixer_abst.h b/include/alsa/mixer_abst.h
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+/**
+ * \file include/mixer_abst.h
+ * \brief Mixer abstract implementation interface library for the ALSA library
+ * \author Jaroslav Kysela <perex@perex.cz>
+ * \date 2005
+ *
+ * Mixer abstact implementation interface library for the ALSA library
+ */
+/*
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as
+ *   published by the Free Software Foundation; either version 2.1 of
+ *   the License, or (at your option) any later version.
+ *
+ *   This program 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 Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __ALSA_MIXER_ABST_H
+#define __ALSA_MIXER_ABST_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \defgroup Mixer_Abstract Mixer Abstact Module Interface
+ *  The mixer abstact module interface.
+ *  \{
+ */
+
+#define	SM_PLAY			0
+#define SM_CAPT			1
+
+#define SM_CAP_GVOLUME		(1<<1)
+#define SM_CAP_GSWITCH		(1<<2)
+#define SM_CAP_PVOLUME		(1<<3)
+#define SM_CAP_PVOLUME_JOIN	(1<<4)
+#define SM_CAP_PSWITCH		(1<<5) 
+#define SM_CAP_PSWITCH_JOIN	(1<<6) 
+#define SM_CAP_CVOLUME		(1<<7) 
+#define SM_CAP_CVOLUME_JOIN	(1<<8) 
+#define SM_CAP_CSWITCH		(1<<9) 
+#define SM_CAP_CSWITCH_JOIN	(1<<10)
+#define SM_CAP_CSWITCH_EXCL	(1<<11)
+#define SM_CAP_PENUM		(1<<12)
+#define SM_CAP_CENUM		(1<<13)
+/* SM_CAP_* 24-31 => private for module use */
+
+#define SM_OPS_IS_ACTIVE	0
+#define SM_OPS_IS_MONO		1
+#define SM_OPS_IS_CHANNEL	2
+#define SM_OPS_IS_ENUMERATED	3
+#define SM_OPS_IS_ENUMCNT	4
+
+#define sm_selem(x)		((sm_selem_t *)((x)->private_data))
+#define sm_selem_ops(x)		((sm_selem_t *)((x)->private_data))->ops
+
+typedef struct _sm_selem {
+	snd_mixer_selem_id_t *id;
+	struct sm_elem_ops *ops;
+	unsigned int caps;
+	unsigned int capture_group;
+} sm_selem_t;
+
+typedef struct _sm_class_basic {
+	char *device;
+	snd_ctl_t *ctl;
+	snd_hctl_t *hctl;
+	snd_ctl_card_info_t *info;
+} sm_class_basic_t;
+
+struct sm_elem_ops {	
+	int (*is)(snd_mixer_elem_t *elem, int dir, int cmd, int val);
+	int (*get_range)(snd_mixer_elem_t *elem, int dir, long *min, long *max);
+	int (*set_range)(snd_mixer_elem_t *elem, int dir, long min, long max);
+	int (*get_dB_range)(snd_mixer_elem_t *elem, int dir, long *min, long *max);
+	int (*ask_vol_dB)(snd_mixer_elem_t *elem, int dir, long value, long *dbValue);
+	int (*ask_dB_vol)(snd_mixer_elem_t *elem, int dir, long dbValue, long *value, int xdir);
+	int (*get_volume)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, long *value);
+	int (*get_dB)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, long *value);
+	int (*set_volume)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, long value);
+	int (*set_dB)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, long value, int xdir);
+	int (*get_switch)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, int *value);
+	int (*set_switch)(snd_mixer_elem_t *elem, int dir, snd_mixer_selem_channel_id_t channel, int value);
+	int (*enum_item_name)(snd_mixer_elem_t *elem, unsigned int item, size_t maxlen, char *buf);
+	int (*get_enum_item)(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, unsigned int *itemp);
+	int (*set_enum_item)(snd_mixer_elem_t *elem, snd_mixer_selem_channel_id_t channel, unsigned int item);
+};
+
+int snd_mixer_selem_compare(const snd_mixer_elem_t *c1, const snd_mixer_elem_t *c2);
+
+int snd_mixer_sbasic_info(const snd_mixer_class_t *class, sm_class_basic_t *info);
+void *snd_mixer_sbasic_get_private(const snd_mixer_class_t *class);
+void snd_mixer_sbasic_set_private(const snd_mixer_class_t *class, void *private_data);
+void snd_mixer_sbasic_set_private_free(const snd_mixer_class_t *class, void (*private_free)(snd_mixer_class_t *class));
+
+/** \} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALSA_MIXER_ABST_H */
+