Merge remote branch 'coling/history'

src/pulse/context.c

@@ -128,6 +128,9 @@ static void reset_callbacks(pa_context *c) {
     c->event_callback = NULL;
     c->event_userdata = NULL;
 
+    c->ext_device_manager.callback = NULL;
+    c->ext_device_manager.userdata = NULL;
+
     c->ext_stream_restore.callback = NULL;
     c->ext_stream_restore.userdata = NULL;
 }
@@ -1434,6 +1437,8 @@ void pa_command_extension(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_t
 
     if (!strcmp(name, "module-stream-restore"))
         pa_ext_stream_restore_command(c, tag, t);
+    else if (!strcmp(name, "module-device-manager"))
+        pa_ext_device_manager_command(c, tag, t);
     else
         pa_log(_("Received message for unknown extension '%s'"), name);
 

src/pulse/ext-device-manager.c

@@ -0,0 +1,440 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2008 Lennart Poettering
+  Copyright 2009 Colin Guthrie
+
+  PulseAudio 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.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; 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 <pulse/context.h>
+#include <pulse/gccmacro.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/macro.h>
+#include <pulsecore/pstream-util.h>
+
+#include "internal.h"
+#include "operation.h"
+#include "fork-detect.h"
+
+#include "ext-device-manager.h"
+
+enum {
+    SUBCOMMAND_TEST,
+    SUBCOMMAND_READ,
+    SUBCOMMAND_RENAME,
+    SUBCOMMAND_DELETE,
+    SUBCOMMAND_ROLE_DEVICE_PRIORITY_ROUTING,
+    SUBCOMMAND_REORDER,
+    SUBCOMMAND_SUBSCRIBE,
+    SUBCOMMAND_EVENT
+};
+
+static void ext_device_manager_test_cb(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
+    pa_operation *o = userdata;
+    uint32_t version = PA_INVALID_INDEX;
+
+    pa_assert(pd);
+    pa_assert(o);
+    pa_assert(PA_REFCNT_VALUE(o) >= 1);
+
+    if (!o->context)
+        goto finish;
+
+    if (command != PA_COMMAND_REPLY) {
+        if (pa_context_handle_error(o->context, command, t, FALSE) < 0)
+            goto finish;
+
+    } else if (pa_tagstruct_getu32(t, &version) < 0 ||
+               !pa_tagstruct_eof(t)) {
+
+        pa_context_fail(o->context, PA_ERR_PROTOCOL);
+        goto finish;
+    }
+
+    if (o->callback) {
+        pa_ext_device_manager_test_cb_t cb = (pa_ext_device_manager_test_cb_t) o->callback;
+        cb(o->context, version, o->userdata);
+    }
+
+finish:
+    pa_operation_done(o);
+    pa_operation_unref(o);
+}
+
+pa_operation *pa_ext_device_manager_test(
+        pa_context *c,
+        pa_ext_device_manager_test_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o;
+    pa_tagstruct *t;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_TEST);
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, ext_device_manager_test_cb, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+static void ext_device_manager_read_cb(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
+    pa_operation *o = userdata;
+    int eol = 1;
+
+    pa_assert(pd);
+    pa_assert(o);
+    pa_assert(PA_REFCNT_VALUE(o) >= 1);
+
+    if (!o->context)
+        goto finish;
+
+    if (command != PA_COMMAND_REPLY) {
+        if (pa_context_handle_error(o->context, command, t, FALSE) < 0)
+            goto finish;
+
+        eol = -1;
+    } else {
+
+        while (!pa_tagstruct_eof(t)) {
+            pa_ext_device_manager_info i;
+            pa_bool_t available;
+
+            memset(&i, 0, sizeof(i));
+            available = FALSE;
+
+            if (pa_tagstruct_gets(t, &i.name) < 0 ||
+                pa_tagstruct_gets(t, &i.description) < 0 ||
+                pa_tagstruct_gets(t, &i.icon) < 0 ||
+                pa_tagstruct_get_boolean(t, &available) < 0 ||
+                pa_tagstruct_getu32(t, &i.n_role_priorities) < 0) {
+
+                pa_context_fail(o->context, PA_ERR_PROTOCOL);
+                goto finish;
+            }
+            i.available = (uint8_t)available;
+
+            if (i.n_role_priorities > 0) {
+                uint32_t j;
+                i.role_priorities = pa_xnew0(pa_ext_device_manager_role_priority_info, i.n_role_priorities+1);
+
+                for (j = 0; j < i.n_role_priorities; j++) {
+
+                    if (pa_tagstruct_gets(t, &i.role_priorities[j].role) < 0 ||
+                        pa_tagstruct_getu32(t, &i.role_priorities[j].priority) < 0) {
+
+                        pa_context_fail(o->context, PA_ERR_PROTOCOL);
+                        pa_xfree(i.role_priorities);
+                        goto finish;
+                    }
+                }
+
+                /* Terminate with an extra NULL entry, just to make sure */
+                i.role_priorities[j].role = NULL;
+                i.role_priorities[j].priority = 0;
+            }
+
+            if (o->callback) {
+                pa_ext_device_manager_read_cb_t cb = (pa_ext_device_manager_read_cb_t) o->callback;
+                cb(o->context, &i, 0, o->userdata);
+            }
+
+            pa_xfree(i.role_priorities);
+        }
+    }
+
+    if (o->callback) {
+        pa_ext_device_manager_read_cb_t cb = (pa_ext_device_manager_read_cb_t) o->callback;
+        cb(o->context, NULL, eol, o->userdata);
+    }
+
+finish:
+    pa_operation_done(o);
+    pa_operation_unref(o);
+}
+
+pa_operation *pa_ext_device_manager_read(
+        pa_context *c,
+        pa_ext_device_manager_read_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o;
+    pa_tagstruct *t;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_READ);
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, ext_device_manager_read_cb, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+pa_operation *pa_ext_device_manager_set_device_description(
+        pa_context *c,
+        const char* device,
+        const char* description,
+        pa_context_success_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o = NULL;
+    pa_tagstruct *t = NULL;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(device);
+    pa_assert(description);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_RENAME);
+
+    pa_tagstruct_puts(t, device);
+    pa_tagstruct_puts(t, description);
+
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+pa_operation *pa_ext_device_manager_delete(
+        pa_context *c,
+        const char *const s[],
+        pa_context_success_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o = NULL;
+    pa_tagstruct *t = NULL;
+    const char *const *k;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(s);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_DELETE);
+
+    for (k = s; *k; k++) {
+        if (!*k || !**k)
+            goto fail;
+
+        pa_tagstruct_puts(t, *k);
+    }
+
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+
+fail:
+    if (o) {
+        pa_operation_cancel(o);
+        pa_operation_unref(o);
+    }
+
+    if (t)
+        pa_tagstruct_free(t);
+
+    pa_context_set_error(c, PA_ERR_INVALID);
+    return NULL;
+}
+
+pa_operation *pa_ext_device_manager_enable_role_device_priority_routing(
+        pa_context *c,
+        int enable,
+        pa_context_success_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o = NULL;
+    pa_tagstruct *t = NULL;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_ROLE_DEVICE_PRIORITY_ROUTING);
+    pa_tagstruct_put_boolean(t, !!enable);
+
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+pa_operation *pa_ext_device_manager_reorder_devices_for_role(
+        pa_context *c,
+        const char* role,
+        const char** devices,
+        pa_context_success_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag, i;
+    pa_operation *o = NULL;
+    pa_tagstruct *t = NULL;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    pa_assert(role);
+    pa_assert(devices);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_REORDER);
+    pa_tagstruct_puts(t, role);
+
+    i = 0; while (devices[i]) i++;
+    pa_tagstruct_putu32(t, i);
+
+    i = 0;
+    while (devices[i])
+        pa_tagstruct_puts(t, devices[i++]);
+
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+pa_operation *pa_ext_device_manager_subscribe(
+        pa_context *c,
+        int enable,
+        pa_context_success_cb_t cb,
+        void *userdata) {
+
+    uint32_t tag;
+    pa_operation *o;
+    pa_tagstruct *t;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);
+
+    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
+
+    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
+    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
+    pa_tagstruct_puts(t, "module-device-manager");
+    pa_tagstruct_putu32(t, SUBCOMMAND_SUBSCRIBE);
+    pa_tagstruct_put_boolean(t, enable);
+    pa_pstream_send_tagstruct(c->pstream, t);
+    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
+
+    return o;
+}
+
+void pa_ext_device_manager_set_subscribe_cb(
+        pa_context *c,
+        pa_ext_device_manager_subscribe_cb_t cb,
+        void *userdata) {
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+
+    if (pa_detect_fork())
+        return;
+
+    c->ext_device_manager.callback = cb;
+    c->ext_device_manager.userdata = userdata;
+}
+
+void pa_ext_device_manager_command(pa_context *c, uint32_t tag, pa_tagstruct *t) {
+    uint32_t subcommand;
+
+    pa_assert(c);
+    pa_assert(PA_REFCNT_VALUE(c) >= 1);
+    pa_assert(t);
+
+    if (pa_tagstruct_getu32(t, &subcommand) < 0 ||
+        !pa_tagstruct_eof(t)) {
+
+        pa_context_fail(c, PA_ERR_PROTOCOL);
+        return;
+    }
+
+    if (subcommand != SUBCOMMAND_EVENT) {
+        pa_context_fail(c, PA_ERR_PROTOCOL);
+        return;
+    }
+
+    if (c->ext_device_manager.callback)
+        c->ext_device_manager.callback(c, c->ext_device_manager.userdata);
+}

src/pulse/ext-device-manager.h

@@ -0,0 +1,128 @@
+#ifndef foopulseextdevicemanagerhfoo
+#define foopulseextdevicemanagerhfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2008 Lennart Poettering
+  Copyright 2009 Colin Guthrie
+
+  PulseAudio 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.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <pulse/context.h>
+#include <pulse/version.h>
+
+/** \file
+ *
+ * Routines for controlling module-device-manager
+ */
+
+PA_C_DECL_BEGIN
+
+typedef struct pa_ext_device_manager_role_priority_info {
+    const char *role;
+    uint32_t priority;
+} pa_ext_device_manager_role_priority_info;
+
+/** Stores information about one device in the device database that is
+ * maintained by module-device-manager. \since 0.9.19 */
+typedef struct pa_ext_device_manager_info {
+    const char *name;            /**< Identifier string of the device. A string like "sink:" or similar followed by the name of the device. */
+    const char *description;     /**< The description of the device when it was last seen, if applicable and saved */
+    const char *icon;            /**< The icon given to the device */
+    uint8_t available;           /**< Is the device currently available? */
+    uint32_t n_role_priorities;  /**< How many role priorities do we have? */
+    pa_ext_device_manager_role_priority_info *role_priorities; /**< An array of role priority structures or NULL */
+} pa_ext_device_manager_info;
+
+/** Callback prototype for pa_ext_device_manager_test(). \since 0.9.19 */
+typedef void (*pa_ext_device_manager_test_cb_t)(
+        pa_context *c,
+        uint32_t version,
+        void *userdata);
+
+/** Test if this extension module is available in the server. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_test(
+        pa_context *c,
+        pa_ext_device_manager_test_cb_t cb,
+        void *userdata);
+
+/** Callback prototype for pa_ext_device_manager_read(). \since 0.9.19 */
+typedef void (*pa_ext_device_manager_read_cb_t)(
+        pa_context *c,
+        const pa_ext_device_manager_info *info,
+        int eol,
+        void *userdata);
+
+/** Read all entries from the device database. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_read(
+        pa_context *c,
+        pa_ext_device_manager_read_cb_t cb,
+        void *userdata);
+
+/** Sets the description for a device. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_set_device_description(
+        pa_context *c,
+        const char* device,
+        const char* description,
+        pa_context_success_cb_t cb,
+        void *userdata);
+
+/** Delete entries from the device database. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_delete(
+        pa_context *c,
+        const char *const s[],
+        pa_context_success_cb_t cb,
+        void *userdata);
+
+/** Enable the role-based device-priority routing mode. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_enable_role_device_priority_routing(
+        pa_context *c,
+        int enable,
+        pa_context_success_cb_t cb,
+        void *userdata);
+
+/** Prefer a given device in the priority list. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_reorder_devices_for_role(
+        pa_context *c,
+        const char* role,
+        const char** devices,
+        pa_context_success_cb_t cb,
+        void *userdata);
+
+/** Subscribe to changes in the device database. \since 0.9.19 */
+pa_operation *pa_ext_device_manager_subscribe(
+        pa_context *c,
+        int enable,
+        pa_context_success_cb_t cb,
+        void *userdata);
+
+/** Callback prototype for pa_ext_device_manager_set_subscribe_cb(). \since 0.9.19 */
+typedef void (*pa_ext_device_manager_subscribe_cb_t)(
+        pa_context *c,
+        void *userdata);
+
+/** Set the subscription callback that is called when
+ * pa_ext_device_manager_subscribe() was called. \since 0.9.19 */
+void pa_ext_device_manager_set_subscribe_cb(
+        pa_context *c,
+        pa_ext_device_manager_subscribe_cb_t cb,
+        void *userdata);
+
+PA_C_DECL_END
+
+#endif

src/pulse/internal.h

@@ -28,6 +28,7 @@
 #include <pulse/stream.h>
 #include <pulse/operation.h>
 #include <pulse/subscribe.h>
+#include <pulse/ext-device-manager.h>
 #include <pulse/ext-stream-restore.h>
 
 #include <pulsecore/socket-client.h>
@@ -101,6 +102,10 @@ struct pa_context {
     uint32_t client_index;
 
     /* Extension specific data */
+    struct {
+        pa_ext_device_manager_subscribe_cb_t callback;
+        void *userdata;
+    } ext_device_manager;
     struct {
         pa_ext_stream_restore_subscribe_cb_t callback;
         void *userdata;
@@ -283,6 +288,7 @@ pa_tagstruct *pa_tagstruct_command(pa_context *c, uint32_t command, uint32_t *ta
 #define PA_FAIL_RETURN_NULL(context, error)     \
     PA_FAIL_RETURN_ANY(context, error, NULL)
 
+void pa_ext_device_manager_command(pa_context *c, uint32_t tag, pa_tagstruct *t);
 void pa_ext_stream_restore_command(pa_context *c, uint32_t tag, pa_tagstruct *t);
 
 pa_bool_t pa_mainloop_is_our_api(pa_mainloop_api*m);