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diff --git a/thirdparty/linuxbsd_headers/alsa/control_external.h b/thirdparty/linuxbsd_headers/alsa/control_external.h
new file mode 100644
index 0000000000..12958e70a5
--- /dev/null
+++ b/thirdparty/linuxbsd_headers/alsa/control_external.h
@@ -0,0 +1,286 @@
+/**
+ * \file include/control_external.h
+ * \brief External control plugin SDK
+ * \author Takashi Iwai <tiwai@suse.de>
+ * \date 2005
+ *
+ * External control plugin SDK.
+ */
+
+/*
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+#ifndef __ALSA_CONTROL_EXTERNAL_H
+#define __ALSA_CONTROL_EXTERNAL_H
+
+#include "control.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \defgroup CtlPlugin_SDK External Control Plugin SDK
+ *  \{
+ */
+
+/**
+ * Define the object entry for external control plugins
+ */
+#define SND_CTL_PLUGIN_ENTRY(name) _snd_ctl_##name##_open
+
+/**
+ * Define the symbols of the given control plugin with versions
+ */
+#define SND_CTL_PLUGIN_SYMBOL(name) SND_DLSYM_BUILD_VERSION(SND_CTL_PLUGIN_ENTRY(name), SND_CONTROL_DLSYM_VERSION);
+
+/**
+ * Define the control plugin
+ */
+#define SND_CTL_PLUGIN_DEFINE_FUNC(plugin) \
+int SND_CTL_PLUGIN_ENTRY(plugin) (snd_ctl_t **handlep, const char *name,\
+				  snd_config_t *root, snd_config_t *conf, int mode)
+
+/** External control plugin handle */
+typedef struct snd_ctl_ext snd_ctl_ext_t;
+/** Callback table of control ext */
+typedef struct snd_ctl_ext_callback snd_ctl_ext_callback_t;
+/** Key to access a control pointer */
+typedef unsigned long snd_ctl_ext_key_t;
+#ifdef DOC_HIDDEN
+/* redefine typedef's for stupid doxygen */
+typedef snd_ctl_ext snd_ctl_ext_t;
+typedef snd_ctl_ext_callback snd_ctl_ext_callback_t;
+#endif
+/** Callback to handle TLV commands. */
+typedef int (snd_ctl_ext_tlv_rw_t)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int op_flag, unsigned int numid,
+				   unsigned int *tlv, unsigned int tlv_size);
+
+/*
+ * Protocol version
+ */
+#define SND_CTL_EXT_VERSION_MAJOR	1	/**< Protocol major version */
+#define SND_CTL_EXT_VERSION_MINOR	0	/**< Protocol minor version */
+#define SND_CTL_EXT_VERSION_TINY	1	/**< Protocol tiny version */
+/**
+ * external plugin protocol version
+ */
+#define SND_CTL_EXT_VERSION		((SND_CTL_EXT_VERSION_MAJOR<<16) |\
+					 (SND_CTL_EXT_VERSION_MINOR<<8) |\
+					 (SND_CTL_EXT_VERSION_TINY))
+
+/** Handle of control ext */
+struct snd_ctl_ext {
+	/**
+	 * protocol version; #SND_CTL_EXT_VERSION must be filled here
+	 * before calling #snd_ctl_ext_create()
+	 */
+	unsigned int version;
+	/**
+	 * Index of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	int card_idx;
+	/**
+	 * ID string of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	char id[16];
+	/**
+	 * Driver name of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	char driver[16];
+	/**
+	 * short name of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	char name[32];
+	/**
+	 * Long name of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	char longname[80];
+	/**
+	 * Mixer name of this card; must be filled before calling #snd_ctl_ext_create()
+	 */
+	char mixername[80];
+	/**
+	 * poll descriptor
+	 */
+	int poll_fd;
+
+	/**
+	 * callbacks of this plugin; must be filled before calling #snd_pcm_ioplug_create()
+	 */
+	const snd_ctl_ext_callback_t *callback;
+	/**
+	 * private data, which can be used freely in the driver callbacks
+	 */
+	void *private_data;
+	/**
+	 * control handle filled by #snd_ctl_ext_create()
+	 */
+	snd_ctl_t *handle;
+
+	int nonblock;			/**< non-block mode; read-only */
+	int subscribed;			/**< events subscribed; read-only */
+
+	/**
+	 * optional TLV data for the control (since protocol 1.0.1)
+	 */
+	union {
+		snd_ctl_ext_tlv_rw_t *c;
+		const unsigned int *p;
+	} tlv;
+};
+
+/** Callback table of ext. */
+struct snd_ctl_ext_callback {
+	/**
+	 * close the control handle; optional
+	 */
+	void (*close)(snd_ctl_ext_t *ext);
+	/**
+	 * return the total number of elements; required
+	 */
+	int (*elem_count)(snd_ctl_ext_t *ext);
+	/**
+	 * return the element id of the given offset (array index); required
+	 */
+	int (*elem_list)(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id);
+	/**
+	 * convert the element id to a search key; required
+	 */
+	snd_ctl_ext_key_t (*find_elem)(snd_ctl_ext_t *ext, const snd_ctl_elem_id_t *id);
+	/**
+	 * the destructor of the key; optional
+	 */
+	void (*free_key)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key);
+	/**
+	 * get the attribute of the element; required
+	 */
+	int (*get_attribute)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+			     int *type, unsigned int *acc, unsigned int *count);
+	/**
+	 * get the element information of integer type
+	 */
+	int (*get_integer_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				long *imin, long *imax, long *istep);
+	/**
+	 * get the element information of integer64 type
+	 */
+	int (*get_integer64_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
+				  int64_t *imin, int64_t *imax, int64_t *istep);
+	/**
+	 * get the element information of enumerated type
+	 */
+	int (*get_enumerated_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
+	/**
+	 * get the name of the enumerated item
+	 */
+	int (*get_enumerated_name)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int item,
+				   char *name, size_t name_max_len);
+	/**
+	 * read the current values of integer type
+	 */
+	int (*read_integer)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value);
+	/**
+	 * read the current values of integer64 type
+	 */
+	int (*read_integer64)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value);
+	/**
+	 * read the current values of enumerated type
+	 */
+	int (*read_enumerated)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
+	/**
+	 * read the current values of bytes type
+	 */
+	int (*read_bytes)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data,
+			  size_t max_bytes);
+	/**
+	 * read the current values of iec958 type
+	 */
+	int (*read_iec958)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958);
+	/**
+	 * update the current values of integer type with the given values
+	 */
+	int (*write_integer)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value);
+	/**
+	 * update the current values of integer64 type with the given values
+	 */
+	int (*write_integer64)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value);
+	/**
+	 * update the current values of enumerated type with the given values
+	 */
+	int (*write_enumerated)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
+	/**
+	 * update the current values of bytes type with the given values
+	 */
+	int (*write_bytes)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data,
+			   size_t max_bytes);
+	/**
+	 * update the current values of iec958 type with the given values
+	 */
+	int (*write_iec958)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958);
+	/**
+	 * subscribe/unsubscribe the event notification; optional
+	 */
+	void (*subscribe_events)(snd_ctl_ext_t *ext, int subscribe);
+	/**
+	 * read a pending notification event; optional
+	 */
+	int (*read_event)(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id, unsigned int *event_mask);
+	/**
+	 * return the number of poll descriptors; optional
+	 */
+	int (*poll_descriptors_count)(snd_ctl_ext_t *ext);
+	/**
+	 * fill the poll descriptors; optional
+	 */
+	int (*poll_descriptors)(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int space);
+	/**
+	 * mangle the revents of poll descriptors
+	 */
+	int (*poll_revents)(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
+};
+
+/**
+ * The access type bits stored in get_attribute callback
+ */
+typedef enum snd_ctl_ext_access {
+	SND_CTL_EXT_ACCESS_READ = (1<<0),
+	SND_CTL_EXT_ACCESS_WRITE = (1<<1),
+	SND_CTL_EXT_ACCESS_READWRITE = (3<<0),
+	SND_CTL_EXT_ACCESS_VOLATILE = (1<<2),
+	SND_CTL_EXT_ACCESS_TLV_READ = (1<<4),
+	SND_CTL_EXT_ACCESS_TLV_WRITE = (1<<5),
+	SND_CTL_EXT_ACCESS_TLV_READWRITE = (3<<4),
+	SND_CTL_EXT_ACCESS_TLV_COMMAND = (1<<6),
+	SND_CTL_EXT_ACCESS_INACTIVE = (1<<8),
+	SND_CTL_EXT_ACCESS_TLV_CALLBACK = (1<<28),
+} snd_ctl_ext_access_t;
+
+/**
+ * find_elem callback returns this if no matching control element is found
+ */
+#define SND_CTL_EXT_KEY_NOT_FOUND	(snd_ctl_ext_key_t)(-1)
+
+int snd_ctl_ext_create(snd_ctl_ext_t *ext, const char *name, int mode);
+int snd_ctl_ext_delete(snd_ctl_ext_t *ext);
+
+/** \} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALSA_CONTROL_EXTERNAL_H */