wasapi: split MMDevice and session code from output

- Run the volume/mute handling on the COM thread,
  removes remaining volume hacks.
- Spawn session manager from device rather than client (fixes #7809)
- Insulate session management from output API (refs #7394)

modules/audio_output/Modules.am

@@ -54,11 +54,11 @@ libjack_plugin_la_LIBADD = $(AM_LIBADD) $(JACK_LIBS) $(LIBM)
 EXTRA_LTLIBRARIES += libjack_plugin.la
 libvlc_LTLIBRARIES += $(LTLIBjack)
 
-libwasapi_plugin_la_SOURCES = wasapi.c
-libwasapi_plugin_la_CFLAGS = $(AM_CFLAGS)
-libwasapi_plugin_la_LIBADD = $(AM_LIBADD) -lole32 -lksuser
+libmmdevice_plugin_la_SOURCES = mmdevice.c mmdevice.h wasapi.c
+libmmdevice_plugin_la_CFLAGS = $(AM_CFLAGS)
+libmmdevice_plugin_la_LIBADD = $(AM_LIBADD) -lole32 -lksuser
 if HAVE_WASAPI
-libvlc_LTLIBRARIES += libwasapi_plugin.la
+libvlc_LTLIBRARIES += libmmdevice_plugin.la
 endif
 
 libdirectsound_plugin_la_SOURCES = directx.c windows_audio_common.h packet.c

modules/audio_output/mmdevice.h

+/*****************************************************************************
+ * mmdevice.h : Windows Multimedia Device API audio output plugin for VLC
+ *****************************************************************************
+ * Copyright (C) 2012 Rémi Denis-Courmont
+ *
+ * This program 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef VLC_AOUT_MMDEVICE_H
+# define VLC_AOUT_MMDEVICE_H 1
+
+typedef struct aout_api aout_api_t;
+
+/**
+ * Audio output simplified API for Windows
+ */
+struct aout_api
+{
+    VLC_COMMON_MEMBERS
+    void *sys;
+
+    HRESULT (*time_get)(aout_api_t *, mtime_t *);
+    HRESULT (*play)(aout_api_t *, block_t *);
+    HRESULT (*pause)(aout_api_t *, bool);
+    HRESULT (*flush)(aout_api_t *);
+};
+
+/**
+ * Creates an audio output stream on a given Windows multimedia device.
+ * \param parent parent VLC object
+ * \param fmt audio output sample format [IN/OUT]
+ * \param dev audio output device
+ * \param sid audio output session GUID [IN]
+ */
+aout_api_t *aout_api_Start(vlc_object_t *parent, audio_sample_format_t *fmt,
+                           IMMDevice *dev, const GUID *sid);
+#define aout_api_Start(o,f,d,s) aout_api_Start(VLC_OBJECT(o),f,d,s)
+
+/**
+ * Destroys an audio output stream.
+ */
+void aout_api_Stop(aout_api_t *);
+
+static inline HRESULT aout_api_TimeGet(aout_api_t *api, mtime_t *delay)
+{
+    return (api->time_get)(api, delay);
+}
+
+static inline HRESULT aout_api_Play(aout_api_t *api, block_t *block)
+{
+    return (api->play)(api, block);
+}
+
+static inline HRESULT aout_api_Pause(aout_api_t *api, bool paused)
+{
+    return (api->pause)(api, paused);
+}
+
+static inline HRESULT aout_api_Flush(aout_api_t *api)
+{
+    return (api->flush)(api);
+}
+#endif