diff --git a/dlls/mmdevapi/unixlib.h b/dlls/mmdevapi/unixlib.h
new file mode 100644
index 00000000000..d17439ebd73
--- /dev/null
+++ b/dlls/mmdevapi/unixlib.h
@@ -0,0 +1,281 @@
+/*
+ * Copyright 2022 Huw Davies
+ *
+ * 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 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
+ * 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 St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include "audioclient.h"
+#include "mmdeviceapi.h"
+
+typedef UINT64 stream_handle;
+
+struct endpoint
+{
+    unsigned int name;
+    unsigned int device;
+};
+
+struct get_endpoint_ids_params
+{
+    EDataFlow flow;
+    struct endpoint *endpoints;
+    unsigned int size;
+    HRESULT result;
+    unsigned int num;
+    unsigned int default_idx;
+};
+
+struct create_stream_params
+{
+    const char *device;
+    EDataFlow flow;
+    AUDCLNT_SHAREMODE share;
+    DWORD flags;
+    REFERENCE_TIME duration;
+    REFERENCE_TIME period;
+    const WAVEFORMATEX *fmt;
+    HRESULT result;
+    stream_handle *stream;
+};
+
+struct release_stream_params
+{
+    stream_handle stream;
+    HANDLE timer_thread;
+    HRESULT result;
+};
+
+struct start_params
+{
+    stream_handle stream;
+    HRESULT result;
+};
+
+struct stop_params
+{
+    stream_handle stream;
+    HRESULT result;
+};
+
+struct reset_params
+{
+    stream_handle stream;
+    HRESULT result;
+};
+
+struct timer_loop_params
+{
+    stream_handle stream;
+};
+
+struct get_render_buffer_params
+{
+    stream_handle stream;
+    UINT32 frames;
+    HRESULT result;
+    BYTE **data;
+};
+
+struct release_render_buffer_params
+{
+    stream_handle stream;
+    UINT32 written_frames;
+    UINT flags;
+    HRESULT result;
+};
+
+struct get_capture_buffer_params
+{
+    stream_handle stream;
+    HRESULT result;
+    BYTE **data;
+    UINT32 *frames;
+    UINT *flags;
+    UINT64 *devpos;
+    UINT64 *qpcpos;
+};
+
+struct release_capture_buffer_params
+{
+    stream_handle stream;
+    UINT32 done;
+    HRESULT result;
+};
+
+struct is_format_supported_params
+{
+    const char *device;
+    EDataFlow flow;
+    AUDCLNT_SHAREMODE share;
+    const WAVEFORMATEX *fmt_in;
+    WAVEFORMATEXTENSIBLE *fmt_out;
+    HRESULT result;
+};
+
+struct get_mix_format_params
+{
+    const char *device;
+    EDataFlow flow;
+    WAVEFORMATEXTENSIBLE *fmt;
+    HRESULT result;
+};
+
+struct get_buffer_size_params
+{
+    stream_handle stream;
+    HRESULT result;
+    UINT32 *size;
+};
+
+struct get_latency_params
+{
+    stream_handle stream;
+    HRESULT result;
+    REFERENCE_TIME *latency;
+};
+
+struct get_current_padding_params
+{
+    stream_handle stream;
+    HRESULT result;
+    UINT32 *padding;
+};
+
+struct get_next_packet_size_params
+{
+    stream_handle stream;
+    HRESULT result;
+    UINT32 *frames;
+};
+
+struct get_frequency_params
+{
+    stream_handle stream;
+    HRESULT result;
+    UINT64 *freq;
+};
+
+struct get_position_params
+{
+    stream_handle stream;
+    HRESULT result;
+    UINT64 *pos;
+    UINT64 *qpctime;
+};
+
+struct set_volumes_params
+{
+    stream_handle stream;
+    float master_volume;
+    const float *volumes;
+    const float *session_volumes;
+};
+
+struct set_event_handle_params
+{
+    stream_handle stream;
+    HANDLE event;
+    HRESULT result;
+};
+
+struct is_started_params
+{
+    stream_handle stream;
+    HRESULT result;
+};
+
+struct get_prop_value_params
+{
+    const char *device;
+    EDataFlow flow;
+    const GUID *guid;
+    const PROPERTYKEY *prop;
+    HRESULT result;
+    PROPVARIANT *value;
+    void *buffer; /* caller allocated buffer to hold value's strings */
+    unsigned int *buffer_size;
+};
+
+struct notify_context
+{
+    BOOL send_notify;
+    WORD dev_id;
+    WORD msg;
+    UINT_PTR param_1;
+    UINT_PTR param_2;
+    UINT_PTR callback;
+    UINT flags;
+    HANDLE device;
+    UINT_PTR instance;
+};
+
+struct midi_out_message_params
+{
+    UINT dev_id;
+    UINT msg;
+    UINT_PTR user;
+    UINT_PTR param_1;
+    UINT_PTR param_2;
+    UINT *err;
+    struct notify_context *notify;
+};
+
+struct midi_in_message_params
+{
+    UINT dev_id;
+    UINT msg;
+    UINT_PTR user;
+    UINT_PTR param_1;
+    UINT_PTR param_2;
+    UINT *err;
+    struct notify_context *notify;
+};
+
+struct midi_notify_wait_params
+{
+    BOOL *quit;
+    struct notify_context *notify;
+};
+
+enum unix_funcs
+{
+    get_endpoint_ids,
+    create_stream,
+    release_stream,
+    start,
+    stop,
+    reset,
+    timer_loop,
+    get_render_buffer,
+    release_render_buffer,
+    get_capture_buffer,
+    release_capture_buffer,
+    is_format_supported,
+    get_mix_format,
+    get_buffer_size,
+    get_latency,
+    get_current_padding,
+    get_next_packet_size,
+    get_frequency,
+    get_position,
+    set_volumes,
+    set_event_handle,
+    is_started,
+    get_prop_value,
+    midi_release,
+    midi_out_message,
+    midi_in_message,
+    midi_notify_wait,
+};
diff --git a/dlls/winealsa.drv/unixlib.h b/dlls/winealsa.drv/unixlib.h
index dce2a34e05c..8c82281012a 100644
--- a/dlls/winealsa.drv/unixlib.h
+++ b/dlls/winealsa.drv/unixlib.h
@@ -16,268 +16,7 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#include "audioclient.h"
-
-typedef UINT64 stream_handle;
-
-struct endpoint
-{
-    unsigned int name;
-    unsigned int device;
-};
-
-struct get_endpoint_ids_params
-{
-    EDataFlow flow;
-    struct endpoint *endpoints;
-    unsigned int size;
-    HRESULT result;
-    unsigned int num;
-    unsigned int default_idx;
-};
-
-struct create_stream_params
-{
-    const char *device;
-    EDataFlow flow;
-    AUDCLNT_SHAREMODE share;
-    DWORD flags;
-    REFERENCE_TIME duration;
-    REFERENCE_TIME period;
-    const WAVEFORMATEX *fmt;
-    HRESULT result;
-    stream_handle *stream;
-};
-
-struct release_stream_params
-{
-    stream_handle stream;
-    HANDLE timer_thread;
-    HRESULT result;
-};
-
-struct start_params
-{
-    stream_handle stream;
-    HRESULT result;
-};
-
-struct stop_params
-{
-    stream_handle stream;
-    HRESULT result;
-};
-
-struct reset_params
-{
-    stream_handle stream;
-    HRESULT result;
-};
-
-struct timer_loop_params
-{
-    stream_handle stream;
-};
-
-struct get_render_buffer_params
-{
-    stream_handle stream;
-    UINT32 frames;
-    HRESULT result;
-    BYTE **data;
-};
-
-struct release_render_buffer_params
-{
-    stream_handle stream;
-    UINT32 written_frames;
-    UINT flags;
-    HRESULT result;
-};
-
-struct get_capture_buffer_params
-{
-    stream_handle stream;
-    HRESULT result;
-    BYTE **data;
-    UINT32 *frames;
-    UINT *flags;
-    UINT64 *devpos;
-    UINT64 *qpcpos;
-};
-
-struct release_capture_buffer_params
-{
-    stream_handle stream;
-    UINT32 done;
-    HRESULT result;
-};
-
-struct is_format_supported_params
-{
-    const char *device;
-    EDataFlow flow;
-    AUDCLNT_SHAREMODE share;
-    const WAVEFORMATEX *fmt_in;
-    WAVEFORMATEXTENSIBLE *fmt_out;
-    HRESULT result;
-};
-
-struct get_mix_format_params
-{
-    const char *device;
-    EDataFlow flow;
-    WAVEFORMATEXTENSIBLE *fmt;
-    HRESULT result;
-};
-
-struct get_buffer_size_params
-{
-    stream_handle stream;
-    HRESULT result;
-    UINT32 *size;
-};
-
-struct get_latency_params
-{
-    stream_handle stream;
-    HRESULT result;
-    REFERENCE_TIME *latency;
-};
-
-struct get_current_padding_params
-{
-    stream_handle stream;
-    HRESULT result;
-    UINT32 *padding;
-};
-
-struct get_next_packet_size_params
-{
-    stream_handle stream;
-    HRESULT result;
-    UINT32 *frames;
-};
-
-struct get_frequency_params
-{
-    stream_handle stream;
-    HRESULT result;
-    UINT64 *freq;
-};
-
-struct get_position_params
-{
-    stream_handle stream;
-    HRESULT result;
-    UINT64 *pos;
-    UINT64 *qpctime;
-};
-
-struct set_volumes_params
-{
-    stream_handle stream;
-    float master_volume;
-    const float *volumes;
-    const float *session_volumes;
-};
-
-struct set_event_handle_params
-{
-    stream_handle stream;
-    HANDLE event;
-    HRESULT result;
-};
-
-struct is_started_params
-{
-    stream_handle stream;
-    HRESULT result;
-};
-
-struct get_prop_value_params
-{
-    const char *device;
-    EDataFlow flow;
-    const GUID *guid;
-    const PROPERTYKEY *prop;
-    HRESULT result;
-    PROPVARIANT *value;
-    void *buffer; /* caller allocated buffer to hold value's strings */
-    unsigned int *buffer_size;
-};
-
-struct notify_context
-{
-    BOOL send_notify;
-    WORD dev_id;
-    WORD msg;
-    UINT_PTR param_1;
-    UINT_PTR param_2;
-    UINT_PTR callback;
-    UINT flags;
-    HANDLE device;
-    UINT_PTR instance;
-};
-
-struct midi_out_message_params
-{
-    UINT dev_id;
-    UINT msg;
-    UINT_PTR user;
-    UINT_PTR param_1;
-    UINT_PTR param_2;
-    UINT *err;
-    struct notify_context *notify;
-};
-
-struct midi_in_message_params
-{
-    UINT dev_id;
-    UINT msg;
-    UINT_PTR user;
-    UINT_PTR param_1;
-    UINT_PTR param_2;
-    UINT *err;
-    struct notify_context *notify;
-};
-
-struct midi_notify_wait_params
-{
-    BOOL *quit;
-    struct notify_context *notify;
-};
-
-enum unix_funcs
-{
-    get_endpoint_ids,
-    create_stream,
-    release_stream,
-    start,
-    stop,
-    reset,
-    timer_loop,
-    get_render_buffer,
-    release_render_buffer,
-    get_capture_buffer,
-    release_capture_buffer,
-    is_format_supported,
-    get_mix_format,
-    get_buffer_size,
-    get_latency,
-    get_current_padding,
-    get_next_packet_size,
-    get_frequency,
-    get_position,
-    set_volumes,
-    set_event_handle,
-    is_started,
-    get_prop_value,
-    midi_release,
-    midi_out_message,
-    midi_in_message,
-    midi_notify_wait,
-};
+#include "../mmdevapi/unixlib.h"
 
 NTSTATUS alsa_midi_release(void *args) DECLSPEC_HIDDEN;
 NTSTATUS alsa_midi_out_message(void *args) DECLSPEC_HIDDEN;