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mmdevice.c
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/*****************************************************************************
* mmdevice.c : Windows Multimedia Device API audio output plugin for VLC
*****************************************************************************
* Copyright (C) 2012-2014 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.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#define INITGUID
#define COBJMACROS
#define CONST_VTABLE
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <audiopolicy.h>
#include <mmdeviceapi.h>
#include <endpointvolume.h>
DEFINE_PROPERTYKEY(PKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd,
0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_aout.h>
#include <vlc_charset.h>
#include <vlc_modules.h>
#include "audio_output/mmdevice.h"
#if (_WIN32_WINNT < 0x600)
static VOID WINAPI (*InitializeConditionVariable)(PCONDITION_VARIABLE);
static BOOL WINAPI (*SleepConditionVariableCS)(PCONDITION_VARIABLE,
PCRITICAL_SECTION, DWORD);
static VOID WINAPI (*WakeConditionVariable)(PCONDITION_VARIABLE);
#define LOOKUP(s) \
if (((s) = (void *)GetProcAddress(h, #s)) == NULL) return FALSE
BOOL WINAPI DllMain(HINSTANCE, DWORD, LPVOID); /* avoid warning */
BOOL WINAPI DllMain(HINSTANCE dll, DWORD reason, LPVOID reserved)
{
(void) dll;
(void) reserved;
switch (reason)
{
case DLL_PROCESS_ATTACH:
{
HANDLE h = GetModuleHandle(TEXT("kernel32.dll"));
if (unlikely(h == NULL))
return FALSE;
LOOKUP(InitializeConditionVariable);
LOOKUP(SleepConditionVariableCS);
LOOKUP(WakeConditionVariable);
break;
}
}
return TRUE;
}
#endif
DEFINE_GUID (GUID_VLC_AUD_OUT, 0x4533f59d, 0x59ee, 0x00c6,
0xad, 0xb2, 0xc6, 0x8b, 0x50, 0x1a, 0x66, 0x55);
static int TryEnterMTA(vlc_object_t *obj)
{
HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
if (unlikely(FAILED(hr)))
{
msg_Err (obj, "cannot initialize COM (error 0x%lx)", hr);
return -1;
}
return 0;
}
#define TryEnterMTA(o) TryEnterMTA(VLC_OBJECT(o))
static void EnterMTA(void)
{
HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
if (unlikely(FAILED(hr)))
abort();
}
static void LeaveMTA(void)
{
CoUninitialize();
}
static wchar_t default_device[1] = L"";
struct aout_sys_t
{
aout_stream_t *stream; /**< Underlying audio output stream */
module_t *module;
audio_output_t *aout;
IMMDeviceEnumerator *it; /**< Device enumerator, NULL when exiting */
IMMDevice *dev; /**< Selected output device, NULL if none */
struct IMMNotificationClient device_events;
struct IAudioSessionEvents session_events;
struct IAudioVolumeDuckNotification duck;
LONG refs;
unsigned ducks;
float gain; /**< Current software gain volume */
wchar_t *device; /**< Requested device identifier, NULL if none */
float volume; /**< Requested volume, negative if none */
signed char mute; /**< Requested mute, negative if none */
CRITICAL_SECTION lock;
CONDITION_VARIABLE work;
CONDITION_VARIABLE ready;
vlc_thread_t thread; /**< Thread for audio session control */
};
/* NOTE: The Core Audio API documentation totally fails to specify the thread
* safety (or lack thereof) of the interfaces. This code takes the most
* restrictive assumption: no thread safety. The background thread (MMThread)
* only runs at specified times, namely between the device_ready and
* device_changed events (effectively a thread synchronization barrier, but
* only Windows 8 natively provides such a primitive).
*
* The audio output owner (i.e. the audio output core) is responsible for
* serializing callbacks. This code only needs to be concerned with
* synchronization between the set of audio output callbacks, MMThread()
* and (trivially) the device and session notifications. */
static int vlc_FromHR(audio_output_t *aout, HRESULT hr)
{
/* Restart on unplug */
if (unlikely(hr == AUDCLNT_E_DEVICE_INVALIDATED))
aout_RestartRequest(aout, AOUT_RESTART_OUTPUT);
return SUCCEEDED(hr) ? 0 : -1;
}
/*** VLC audio output callbacks ***/
static int TimeGet(audio_output_t *aout, mtime_t *restrict delay)
{
aout_sys_t *sys = aout->sys;
HRESULT hr;
EnterMTA();
hr = aout_stream_TimeGet(sys->stream, delay);
LeaveMTA();
return SUCCEEDED(hr) ? 0 : -1;
}
static void Play(audio_output_t *aout, block_t *block)
{
aout_sys_t *sys = aout->sys;
HRESULT hr;
EnterMTA();
hr = aout_stream_Play(sys->stream, block);
LeaveMTA();
vlc_FromHR(aout, hr);
}
static void Pause(audio_output_t *aout, bool paused, mtime_t date)
{
aout_sys_t *sys = aout->sys;
HRESULT hr;
EnterMTA();
hr = aout_stream_Pause(sys->stream, paused);
LeaveMTA();
vlc_FromHR(aout, hr);
(void) date;
}
static void Flush(audio_output_t *aout, bool wait)
{
aout_sys_t *sys = aout->sys;
EnterMTA();
aout_stream_Flush(sys->stream, wait);
LeaveMTA();
}
static int VolumeSet(audio_output_t *aout, float vol)
{
aout_sys_t *sys = aout->sys;
float gain = 1.f;
vol = vol * vol * vol; /* ISimpleAudioVolume is tapered linearly. */
if (vol > 1.f)
{
gain = vol;
vol = 1.f;
}
aout_GainRequest(aout, gain);
EnterCriticalSection(&sys->lock);
sys->gain = gain;
sys->volume = vol;
WakeConditionVariable(&sys->work);
LeaveCriticalSection(&sys->lock);
return 0;
}
static int MuteSet(audio_output_t *aout, bool mute)
{
aout_sys_t *sys = aout->sys;
EnterCriticalSection(&sys->lock);
sys->mute = mute;
WakeConditionVariable(&sys->work);
LeaveCriticalSection(&sys->lock);
return 0;
}
/*** Audio session events ***/
static inline aout_sys_t *vlc_AudioSessionEvents_sys(IAudioSessionEvents *this)
{
return (void *)(((char *)this) - offsetof(aout_sys_t, session_events));
}
static STDMETHODIMP
vlc_AudioSessionEvents_QueryInterface(IAudioSessionEvents *this, REFIID riid,
void **ppv)
{
if (IsEqualIID(riid, &IID_IUnknown)
|| IsEqualIID(riid, &IID_IAudioSessionEvents))
{
*ppv = this;
IUnknown_AddRef(this);
return S_OK;
}
else
{
*ppv = NULL;
return E_NOINTERFACE;
}
}
static STDMETHODIMP_(ULONG)
vlc_AudioSessionEvents_AddRef(IAudioSessionEvents *this)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
return InterlockedIncrement(&sys->refs);
}
static STDMETHODIMP_(ULONG)
vlc_AudioSessionEvents_Release(IAudioSessionEvents *this)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
return InterlockedDecrement(&sys->refs);
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnDisplayNameChanged(IAudioSessionEvents *this,
LPCWSTR wname, LPCGUID ctx)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "display name changed: %ls", wname);
(void) ctx;
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnIconPathChanged(IAudioSessionEvents *this,
LPCWSTR wpath, LPCGUID ctx)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "icon path changed: %ls", wpath);
(void) ctx;
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnSimpleVolumeChanged(IAudioSessionEvents *this,
float vol, BOOL mute,
LPCGUID ctx)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "simple volume changed: %f, muting %sabled", vol,
mute ? "en" : "dis");
EnterCriticalSection(&sys->lock);
WakeConditionVariable(&sys->work); /* implicit state: vol & mute */
LeaveCriticalSection(&sys->lock);
(void) ctx;
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnChannelVolumeChanged(IAudioSessionEvents *this,
DWORD count, float *vols,
DWORD changed, LPCGUID ctx)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
if (changed != (DWORD)-1)
msg_Dbg(aout, "channel volume %lu of %lu changed: %f", changed, count,
vols[changed]);
else
msg_Dbg(aout, "%lu channels volume changed", count);
(void) ctx;
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnGroupingParamChanged(IAudioSessionEvents *this,
LPCGUID param, LPCGUID ctx)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "grouping parameter changed");
(void) param;
(void) ctx;
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnStateChanged(IAudioSessionEvents *this,
AudioSessionState state)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "state changed: %d", state);
return S_OK;
}
static STDMETHODIMP
vlc_AudioSessionEvents_OnSessionDisconnected(IAudioSessionEvents *this,
AudioSessionDisconnectReason reason)
{
aout_sys_t *sys = vlc_AudioSessionEvents_sys(this);
audio_output_t *aout = sys->aout;
switch (reason)
{
case DisconnectReasonDeviceRemoval:
msg_Warn(aout, "session disconnected: %s", "device removed");
break;
case DisconnectReasonServerShutdown:
msg_Err(aout, "session disconnected: %s", "service stopped");
return S_OK;
case DisconnectReasonFormatChanged:
msg_Warn(aout, "session disconnected: %s", "format changed");
break;
case DisconnectReasonSessionLogoff:
msg_Err(aout, "session disconnected: %s", "user logged off");
return S_OK;
case DisconnectReasonSessionDisconnected:
msg_Err(aout, "session disconnected: %s", "session disconnected");
return S_OK;
case DisconnectReasonExclusiveModeOverride:
msg_Err(aout, "session disconnected: %s", "stream overriden");
return S_OK;
default:
msg_Warn(aout, "session disconnected: unknown reason %d", reason);
return S_OK;
}
/* NOTE: audio decoder thread should get invalidated device and restart */
return S_OK;
}
static const struct IAudioSessionEventsVtbl vlc_AudioSessionEvents =
{
vlc_AudioSessionEvents_QueryInterface,
vlc_AudioSessionEvents_AddRef,
vlc_AudioSessionEvents_Release,
vlc_AudioSessionEvents_OnDisplayNameChanged,
vlc_AudioSessionEvents_OnIconPathChanged,
vlc_AudioSessionEvents_OnSimpleVolumeChanged,
vlc_AudioSessionEvents_OnChannelVolumeChanged,
vlc_AudioSessionEvents_OnGroupingParamChanged,
vlc_AudioSessionEvents_OnStateChanged,
vlc_AudioSessionEvents_OnSessionDisconnected,
};
static inline aout_sys_t *vlc_AudioVolumeDuckNotification_sys(IAudioVolumeDuckNotification *this)
{
return (void *)(((char *)this) - offsetof(aout_sys_t, duck));
}
static STDMETHODIMP
vlc_AudioVolumeDuckNotification_QueryInterface(
IAudioVolumeDuckNotification *this, REFIID riid, void **ppv)
{
if (IsEqualIID(riid, &IID_IUnknown)
|| IsEqualIID(riid, &IID_IAudioVolumeDuckNotification))
{
*ppv = this;
IUnknown_AddRef(this);
return S_OK;
}
else
{
*ppv = NULL;
return E_NOINTERFACE;
}
}
static STDMETHODIMP_(ULONG)
vlc_AudioVolumeDuckNotification_AddRef(IAudioVolumeDuckNotification *this)
{
aout_sys_t *sys = vlc_AudioVolumeDuckNotification_sys(this);
return InterlockedIncrement(&sys->refs);
}
static STDMETHODIMP_(ULONG)
vlc_AudioVolumeDuckNotification_Release(IAudioVolumeDuckNotification *this)
{
aout_sys_t *sys = vlc_AudioVolumeDuckNotification_sys(this);
return InterlockedDecrement(&sys->refs);
}
static STDMETHODIMP
vlc_AudioVolumeDuckNotification_OnVolumeDuckNotification(
IAudioVolumeDuckNotification *this, LPCWSTR sid, UINT32 count)
{
aout_sys_t *sys = vlc_AudioVolumeDuckNotification_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "volume ducked by %ls of %u sessions", sid, count);
sys->ducks++;
aout_PolicyReport(aout, true);
return S_OK;
}
static STDMETHODIMP
vlc_AudioVolumeDuckNotification_OnVolumeUnduckNotification(
IAudioVolumeDuckNotification *this, LPCWSTR sid)
{
aout_sys_t *sys = vlc_AudioVolumeDuckNotification_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "volume unducked by %ls", sid);
sys->ducks--;
aout_PolicyReport(aout, sys->ducks != 0);
return S_OK;
}
static const struct IAudioVolumeDuckNotificationVtbl vlc_AudioVolumeDuckNotification =
{
vlc_AudioVolumeDuckNotification_QueryInterface,
vlc_AudioVolumeDuckNotification_AddRef,
vlc_AudioVolumeDuckNotification_Release,
vlc_AudioVolumeDuckNotification_OnVolumeDuckNotification,
vlc_AudioVolumeDuckNotification_OnVolumeUnduckNotification,
};
/*** Audio devices ***/
/** Gets the user-readable device name */
static char *DeviceName(IMMDevice *dev)
{
IPropertyStore *props;
char *name = NULL;
PROPVARIANT v;
HRESULT hr;
hr = IMMDevice_OpenPropertyStore(dev, STGM_READ, &props);
if (FAILED(hr))
return NULL;
PropVariantInit(&v);
hr = IPropertyStore_GetValue(props, &PKEY_Device_FriendlyName, &v);
if (SUCCEEDED(hr))
{
name = FromWide(v.pwszVal);
PropVariantClear(&v);
}
IPropertyStore_Release(props);
return name;
}
/** Checks that a device is an output device */
static bool DeviceIsRender(IMMDevice *dev)
{
void *pv;
if (FAILED(IMMDevice_QueryInterface(dev, &IID_IMMEndpoint, &pv)))
return false;
IMMEndpoint *ep = pv;
EDataFlow flow;
if (FAILED(IMMEndpoint_GetDataFlow(ep, &flow)))
flow = eCapture;
IMMEndpoint_Release(ep);
return flow == eRender;
}
static HRESULT DeviceUpdated(audio_output_t *aout, LPCWSTR wid)
{
aout_sys_t *sys = aout->sys;
HRESULT hr;
IMMDevice *dev;
hr = IMMDeviceEnumerator_GetDevice(sys->it, wid, &dev);
if (FAILED(hr))
return hr;
if (!DeviceIsRender(dev))
{
IMMDevice_Release(dev);
return S_OK;
}
char *id = FromWide(wid);
if (unlikely(id == NULL))
{
IMMDevice_Release(dev);
return E_OUTOFMEMORY;
}
char *name = DeviceName(dev);
IMMDevice_Release(dev);
aout_HotplugReport(aout, id, (name != NULL) ? name : id);
free(name);
free(id);
return S_OK;
}
static inline aout_sys_t *vlc_MMNotificationClient_sys(IMMNotificationClient *this)
{
return (void *)(((char *)this) - offsetof(aout_sys_t, device_events));
}
static STDMETHODIMP
vlc_MMNotificationClient_QueryInterface(IMMNotificationClient *this,
REFIID riid, void **ppv)
{
if (IsEqualIID(riid, &IID_IUnknown)
|| IsEqualIID(riid, &IID_IMMNotificationClient))
{
*ppv = this;
IUnknown_AddRef(this);
return S_OK;
}
else
{
*ppv = NULL;
return E_NOINTERFACE;
}
}
static STDMETHODIMP_(ULONG)
vlc_MMNotificationClient_AddRef(IMMNotificationClient *this)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
return InterlockedIncrement(&sys->refs);
}
static STDMETHODIMP_(ULONG)
vlc_MMNotificationClient_Release(IMMNotificationClient *this)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
return InterlockedDecrement(&sys->refs);
}
static STDMETHODIMP
vlc_MMNotificationClient_OnDefaultDeviceChange(IMMNotificationClient *this,
EDataFlow flow, ERole role,
LPCWSTR wid)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
audio_output_t *aout = sys->aout;
if (flow != eRender)
return S_OK;
if (role != eConsole)
return S_OK;
msg_Dbg(aout, "default device changed: %ls", wid); /* TODO? migrate */
return S_OK;
}
static STDMETHODIMP
vlc_MMNotificationClient_OnDeviceAdded(IMMNotificationClient *this,
LPCWSTR wid)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
audio_output_t *aout = sys->aout;
msg_Dbg(aout, "device %ls added", wid);
return DeviceUpdated(aout, wid);
}
static STDMETHODIMP
vlc_MMNotificationClient_OnDeviceRemoved(IMMNotificationClient *this,
LPCWSTR wid)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
audio_output_t *aout = sys->aout;
char *id = FromWide(wid);
msg_Dbg(aout, "device %ls removed", wid);
if (unlikely(id == NULL))
return E_OUTOFMEMORY;
aout_HotplugReport(aout, id, NULL);
free(id);
return S_OK;
}
static STDMETHODIMP
vlc_MMNotificationClient_OnDeviceStateChanged(IMMNotificationClient *this,
LPCWSTR wid, DWORD state)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
audio_output_t *aout = sys->aout;
/* TODO: show device state / ignore missing devices */
msg_Dbg(aout, "device %ls state changed %08lx", wid, state);
return S_OK;
}
static STDMETHODIMP
vlc_MMNotificationClient_OnPropertyValueChanged(IMMNotificationClient *this,
LPCWSTR wid,
const PROPERTYKEY key)
{
aout_sys_t *sys = vlc_MMNotificationClient_sys(this);
audio_output_t *aout = sys->aout;
if (key.pid == PKEY_Device_FriendlyName.pid)
{
msg_Dbg(aout, "device %ls name changed", wid);
return DeviceUpdated(aout, wid);
}
return S_OK;
}
static const struct IMMNotificationClientVtbl vlc_MMNotificationClient =
{
vlc_MMNotificationClient_QueryInterface,
vlc_MMNotificationClient_AddRef,
vlc_MMNotificationClient_Release,
vlc_MMNotificationClient_OnDeviceStateChanged,
vlc_MMNotificationClient_OnDeviceAdded,
vlc_MMNotificationClient_OnDeviceRemoved,
vlc_MMNotificationClient_OnDefaultDeviceChange,
vlc_MMNotificationClient_OnPropertyValueChanged,
};
static int DevicesEnum(audio_output_t *aout, IMMDeviceEnumerator *it)
{
HRESULT hr;
IMMDeviceCollection *devs;
hr = IMMDeviceEnumerator_EnumAudioEndpoints(it, eRender,
DEVICE_STATE_ACTIVE, &devs);
if (FAILED(hr))
{
msg_Warn(aout, "cannot enumerate audio endpoints (error 0x%lx)", hr);
return -1;
}
UINT count;
hr = IMMDeviceCollection_GetCount(devs, &count);
if (FAILED(hr))
{
msg_Warn(aout, "cannot count audio endpoints (error 0x%lx)", hr);
count = 0;
}
unsigned n = 0;
for (UINT i = 0; i < count; i++)
{
IMMDevice *dev;
char *id, *name;
hr = IMMDeviceCollection_Item(devs, i, &dev);
if (FAILED(hr))
continue;
/* Unique device ID */
LPWSTR devid;
hr = IMMDevice_GetId(dev, &devid);
if (FAILED(hr))
{
IMMDevice_Release(dev);
continue;
}
id = FromWide(devid);
CoTaskMemFree(devid);
name = DeviceName(dev);
IMMDevice_Release(dev);
aout_HotplugReport(aout, id, (name != NULL) ? name : id);
free(name);
free(id);
n++;
}
IMMDeviceCollection_Release(devs);
return n;
}
static int DeviceSelect(audio_output_t *aout, const char *id)
{
aout_sys_t *sys = aout->sys;
wchar_t *device;
if (id != NULL)
{
device = ToWide(id);
if (unlikely(device == NULL))
return -1;
}
else
device = default_device;
EnterCriticalSection(&sys->lock);
assert(sys->device == NULL);
sys->device = device;
WakeConditionVariable(&sys->work);
while (sys->device != NULL)
SleepConditionVariableCS(&sys->ready, &sys->lock, INFINITE);
LeaveCriticalSection(&sys->lock);
if (sys->stream != NULL && sys->dev != NULL)
/* Request restart of stream with the new device */
aout_RestartRequest(aout, AOUT_RESTART_OUTPUT);
return (sys->dev != NULL) ? 0 : -1;
}
/*** Initialization / deinitialization **/
static wchar_t *var_InheritWide(vlc_object_t *obj, const char *name)
{
char *v8 = var_InheritString(obj, name);
if (v8 == NULL)
return NULL;
wchar_t *v16 = ToWide(v8);
free(v8);
return v16;
}
#define var_InheritWide(o,n) var_InheritWide(VLC_OBJECT(o),n)
/** MMDevice audio output thread.
* This thread takes cares of the audio session control. Inconveniently enough,
* the audio session control interface must:
* - be created and destroyed from the same thread, and
* - survive across VLC audio output calls.
* The only way to reconcile both requirements is a custom thread.
* The thread also ensure that the COM Multi-Thread Apartment is continuously
* referenced so that MMDevice objects are not destroyed early.
* Furthermore, VolumeSet() and MuteSet() may be called from a thread with a
* COM STA, so that it cannot access the COM MTA for audio controls.
*/
static HRESULT MMSession(audio_output_t *aout, IMMDeviceEnumerator *it)
{
aout_sys_t *sys = aout->sys;
IAudioSessionManager *manager;
IAudioSessionControl *control;
ISimpleAudioVolume *volume;
IAudioEndpointVolume *endpoint;
void *pv;
HRESULT hr;
assert(sys->device != NULL);
assert(sys->dev == NULL);
if (sys->device != default_device) /* Device selected explicitly */
{
msg_Dbg(aout, "using selected device %ls", sys->device);
hr = IMMDeviceEnumerator_GetDevice(it, sys->device, &sys->dev);
if (FAILED(hr))
msg_Err(aout, "cannot get selected device %ls (error 0x%lx)",
sys->device, hr);
free(sys->device);
}
else
hr = AUDCLNT_E_DEVICE_INVALIDATED;
while (hr == AUDCLNT_E_DEVICE_INVALIDATED)
{ /* Default device selected by policy and with stream routing.
* "Do not use eMultimedia" says MSDN. */
msg_Dbg(aout, "using default device");
hr = IMMDeviceEnumerator_GetDefaultAudioEndpoint(it, eRender,
eConsole, &sys->dev);
if (FAILED(hr))
msg_Err(aout, "cannot get default device (error 0x%lx)", hr);
}
sys->device = NULL;
WakeConditionVariable(&sys->ready);
if (SUCCEEDED(hr))
{ /* Report actual device */
LPWSTR wdevid;
hr = IMMDevice_GetId(sys->dev, &wdevid);
if (SUCCEEDED(hr))
{
char *id = FromWide(wdevid);
CoTaskMemFree(wdevid);
if (likely(id != NULL))
{
aout_DeviceReport(aout, id);
free(id);
}
}
}
else
{
msg_Err(aout, "cannot get device identifier (error 0x%lx)", hr);
return hr;
}
/* Create session manager (for controls even w/o active audio client) */
hr = IMMDevice_Activate(sys->dev, &IID_IAudioSessionManager,
CLSCTX_ALL, NULL, &pv);
manager = pv;
if (SUCCEEDED(hr))
{
LPCGUID guid = &GUID_VLC_AUD_OUT;
/* Register session control */
hr = IAudioSessionManager_GetAudioSessionControl(manager, guid, 0,
&control);
if (SUCCEEDED(hr))
{
wchar_t *ua = var_InheritWide(aout, "user-agent");
IAudioSessionControl_SetDisplayName(control, ua, NULL);
free(ua);
IAudioSessionControl_RegisterAudioSessionNotification(control,
&sys->session_events);
}
else
msg_Err(aout, "cannot get session control (error 0x%lx)", hr);
hr = IAudioSessionManager_GetSimpleAudioVolume(manager, guid, FALSE,
&volume);
if (FAILED(hr))
msg_Err(aout, "cannot get simple volume (error 0x%lx)", hr);
/* Try to get version 2 (Windows 7) of the manager & control */
wchar_t *siid = NULL;
hr = IAudioSessionManager_QueryInterface(manager,
&IID_IAudioSessionControl2, &pv);
if (SUCCEEDED(hr))
{
IAudioSessionControl2 *c2 = pv;
IAudioSessionControl2_SetDuckingPreference(c2, FALSE);
hr = IAudioSessionControl2_GetSessionInstanceIdentifier(c2, &siid);
if (FAILED(hr))
siid = NULL;
IAudioSessionControl2_Release(c2);
}
else
msg_Dbg(aout, "version 2 session control unavailable");
hr = IAudioSessionManager_QueryInterface(manager,
&IID_IAudioSessionManager2, &pv);
if (SUCCEEDED(hr))
{
IAudioSessionManager2 *m2 = pv;
IAudioSessionManager2_RegisterDuckNotification(m2, siid,
&sys->duck);
IAudioSessionManager2_Release(m2);
}
else
msg_Dbg(aout, "version 2 session management unavailable");
CoTaskMemFree(siid);
}
else
{
msg_Err(aout, "cannot activate session manager (error 0x%lx)", hr);
control = NULL;
volume = NULL;
}
hr = IMMDevice_Activate(sys->dev, &IID_IAudioEndpointVolume,
CLSCTX_ALL, NULL, &pv);
endpoint = pv;
if (SUCCEEDED(hr))
{
float min, max, inc;
hr = IAudioEndpointVolume_GetVolumeRange(endpoint, &min, &max, &inc);
if (SUCCEEDED(hr))
msg_Dbg(aout, "volume from %+f dB to %+f dB with %f dB increments",
min, max, inc);
else
msg_Err(aout, "cannot get volume range (error 0x%lx)", hr);
}
else
msg_Err(aout, "cannot activate endpoint volume (error %lx)", hr);
/* Main loop (adjust volume as long as device is unchanged) */
while (sys->device == NULL)
{
if (volume != NULL)
{
float level;
hr = ISimpleAudioVolume_GetMasterVolume(volume, &level);
if (SUCCEEDED(hr))
aout_VolumeReport(aout, cbrtf(level * sys->gain));
else
msg_Err(aout, "cannot get master volume (error 0x%lx)", hr);
level = sys->volume;
if (level >= 0.f)
{
hr = ISimpleAudioVolume_SetMasterVolume(volume, level, NULL);
if (FAILED(hr))
msg_Err(aout, "cannot set master volume (error 0x%lx)",
hr);
}
sys->volume = -1.f;
BOOL mute;
hr = ISimpleAudioVolume_GetMute(volume, &mute);
if (SUCCEEDED(hr))
aout_MuteReport(aout, mute != FALSE);
else
msg_Err(aout, "cannot get mute (error 0x%lx)", hr);
if (sys->mute >= 0)
{
mute = sys->mute ? TRUE : FALSE;
hr = ISimpleAudioVolume_SetMute(volume, mute, NULL);
if (FAILED(hr))
msg_Err(aout, "cannot set mute (error 0x%lx)", hr);
}
sys->mute = -1;
}
SleepConditionVariableCS(&sys->work, &sys->lock, INFINITE);
}
LeaveCriticalSection(&sys->lock);
if (endpoint != NULL)
IAudioEndpointVolume_Release(endpoint);
if (manager != NULL)
{ /* Deregister callbacks *without* the lock */
hr = IAudioSessionManager_QueryInterface(manager,
&IID_IAudioSessionManager2, &pv);
if (SUCCEEDED(hr))
{
IAudioSessionManager2 *m2 = pv;
IAudioSessionManager2_UnregisterDuckNotification(m2, &sys->duck);
IAudioSessionManager2_Release(m2);
}
if (volume != NULL)
ISimpleAudioVolume_Release(volume);
if (control != NULL)
{
IAudioSessionControl_UnregisterAudioSessionNotification(control,
&sys->session_events);
IAudioSessionControl_Release(control);
}
IAudioSessionManager_Release(manager);