gstreamer/subprojects/gst-plugins-bad/sys/wasapi/gstmmdeviceenumerator.cpp

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/* GStreamer
* Copyright (C) 2021 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstmmdeviceenumerator.h"
#ifndef INITGUID
#include <initguid.h>
#endif
/* *INDENT-OFF* */
G_BEGIN_DECLS
GST_DEBUG_CATEGORY_EXTERN (gst_wasapi_debug);
#define GST_CAT_DEFAULT gst_wasapi_debug
G_END_DECLS
/* IMMNotificationClient implementation */
class GstIMMNotificationClient : public IMMNotificationClient
{
public:
static HRESULT
CreateInstance (GstMMDeviceEnumerator * enumerator,
const GstMMNotificationClientCallbacks * callbacks,
gpointer user_data,
IMMNotificationClient ** client)
{
GstIMMNotificationClient *self;
self = new GstIMMNotificationClient ();
self->callbacks_ = *callbacks;
self->user_data_ = user_data;
g_weak_ref_set (&self->enumerator_, enumerator);
*client = (IMMNotificationClient *) self;
return S_OK;
}
/* IUnknown */
STDMETHODIMP
QueryInterface (REFIID riid, void ** object)
{
if (!object)
return E_POINTER;
if (riid == IID_IUnknown) {
*object = static_cast<IUnknown *> (this);
} else if (riid == __uuidof(IMMNotificationClient)) {
*object = static_cast<IMMNotificationClient *> (this);
} else {
*object = nullptr;
return E_NOINTERFACE;
}
AddRef ();
return S_OK;
}
STDMETHODIMP_ (ULONG)
AddRef (void)
{
GST_TRACE ("%p, %d", this, (guint) ref_count_);
return InterlockedIncrement (&ref_count_);
}
STDMETHODIMP_ (ULONG)
Release (void)
{
ULONG ref_count;
GST_TRACE ("%p, %d", this, (guint) ref_count_);
ref_count = InterlockedDecrement (&ref_count_);
if (ref_count == 0) {
GST_TRACE ("Delete instance %p", this);
delete this;
}
return ref_count;
}
/* IMMNotificationClient */
STDMETHODIMP
OnDeviceStateChanged (LPCWSTR device_id, DWORD new_state)
{
GstMMDeviceEnumerator *listener;
HRESULT hr;
if (!callbacks_.device_state_changed)
return S_OK;
listener = (GstMMDeviceEnumerator *) g_weak_ref_get (&enumerator_);
if (!listener)
return S_OK;
hr = callbacks_.device_state_changed (listener, device_id, new_state,
user_data_);
gst_object_unref (listener);
return hr;
}
STDMETHODIMP
OnDeviceAdded (LPCWSTR device_id)
{
GstMMDeviceEnumerator *listener;
HRESULT hr;
if (!callbacks_.device_added)
return S_OK;
listener = (GstMMDeviceEnumerator *) g_weak_ref_get (&enumerator_);
if (!listener)
return S_OK;
hr = callbacks_.device_added (listener, device_id, user_data_);
gst_object_unref (listener);
return hr;
}
STDMETHODIMP
OnDeviceRemoved (LPCWSTR device_id)
{
GstMMDeviceEnumerator *listener;
HRESULT hr;
if (!callbacks_.device_removed)
return S_OK;
listener = (GstMMDeviceEnumerator *) g_weak_ref_get (&enumerator_);
if (!listener)
return S_OK;
hr = callbacks_.device_removed (listener, device_id, user_data_);
gst_object_unref (listener);
return hr;
}
STDMETHODIMP
OnDefaultDeviceChanged (EDataFlow flow, ERole role, LPCWSTR default_device_id)
{
GstMMDeviceEnumerator *listener;
HRESULT hr;
if (!callbacks_.default_device_changed)
return S_OK;
listener = (GstMMDeviceEnumerator *) g_weak_ref_get (&enumerator_);
if (!listener)
return S_OK;
hr = callbacks_.default_device_changed (listener,
flow, role, default_device_id, user_data_);
gst_object_unref (listener);
return hr;
}
STDMETHODIMP
OnPropertyValueChanged (LPCWSTR device_id, const PROPERTYKEY key)
{
GstMMDeviceEnumerator *listener;
HRESULT hr;
if (!callbacks_.property_value_changed)
return S_OK;
listener = (GstMMDeviceEnumerator *) g_weak_ref_get (&enumerator_);
if (!device_id)
return S_OK;
hr = callbacks_.property_value_changed (listener,
device_id, key, user_data_);
gst_object_unref (listener);
return hr;
}
private:
GstIMMNotificationClient ()
: ref_count_ (1)
{
g_weak_ref_init (&enumerator_, nullptr);
}
virtual ~GstIMMNotificationClient ()
{
g_weak_ref_clear (&enumerator_);
}
private:
ULONG ref_count_;
GstMMNotificationClientCallbacks callbacks_;
gpointer user_data_;
GWeakRef enumerator_;
};
/* *INDENT-ON* */
struct _GstMMDeviceEnumerator
{
GstObject parent;
IMMDeviceEnumerator *handle;
IMMNotificationClient *client;
GMutex lock;
GCond cond;
GThread *thread;
GMainContext *context;
GMainLoop *loop;
gboolean running;
};
static void gst_mm_device_enumerator_constructed (GObject * object);
static void gst_mm_device_enumerator_finalize (GObject * object);
static gpointer
gst_mm_device_enumerator_thread_func (GstMMDeviceEnumerator * self);
#define gst_mm_device_enumerator_parent_class parent_class
G_DEFINE_TYPE (GstMMDeviceEnumerator,
gst_mm_device_enumerator, GST_TYPE_OBJECT);
static void
gst_mm_device_enumerator_class_init (GstMMDeviceEnumeratorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->constructed = gst_mm_device_enumerator_constructed;
gobject_class->finalize = gst_mm_device_enumerator_finalize;
}
static void
gst_mm_device_enumerator_init (GstMMDeviceEnumerator * self)
{
g_mutex_init (&self->lock);
g_cond_init (&self->cond);
self->context = g_main_context_new ();
self->loop = g_main_loop_new (self->context, FALSE);
}
static void
gst_mm_device_enumerator_constructed (GObject * object)
{
GstMMDeviceEnumerator *self = GST_MM_DEVICE_ENUMERATOR (object);
g_mutex_lock (&self->lock);
self->thread = g_thread_new ("GstMMDeviceEnumerator",
(GThreadFunc) gst_mm_device_enumerator_thread_func, self);
while (!g_main_loop_is_running (self->loop))
g_cond_wait (&self->cond, &self->lock);
g_mutex_unlock (&self->lock);
}
static void
gst_mm_device_enumerator_finalize (GObject * object)
{
GstMMDeviceEnumerator *self = GST_MM_DEVICE_ENUMERATOR (object);
g_main_loop_quit (self->loop);
g_thread_join (self->thread);
g_main_loop_unref (self->loop);
g_main_context_unref (self->context);
g_mutex_clear (&self->lock);
g_cond_clear (&self->cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
loop_running_cb (GstMMDeviceEnumerator * self)
{
g_mutex_lock (&self->lock);
g_cond_signal (&self->cond);
g_mutex_unlock (&self->lock);
return G_SOURCE_REMOVE;
}
static gpointer
gst_mm_device_enumerator_thread_func (GstMMDeviceEnumerator * self)
{
GSource *idle_source;
IMMDeviceEnumerator *enumerator = nullptr;
HRESULT hr;
CoInitializeEx (NULL, COINIT_MULTITHREADED);
g_main_context_push_thread_default (self->context);
idle_source = g_idle_source_new ();
g_source_set_callback (idle_source,
(GSourceFunc) loop_running_cb, self, nullptr);
g_source_attach (idle_source, self->context);
g_source_unref (idle_source);
hr = CoCreateInstance (__uuidof (MMDeviceEnumerator),
nullptr, CLSCTX_ALL, IID_PPV_ARGS (&enumerator));
if (FAILED (hr)) {
GST_ERROR_OBJECT (self, "Failed to create IMMDeviceEnumerator instance");
goto run_loop;
}
self->handle = enumerator;
run_loop:
GST_INFO_OBJECT (self, "Starting loop");
g_main_loop_run (self->loop);
GST_INFO_OBJECT (self, "Stopped loop");
if (self->client && self->handle) {
self->handle->UnregisterEndpointNotificationCallback (self->client);
self->client->Release ();
}
if (self->handle)
self->handle->Release ();
g_main_context_pop_thread_default (self->context);
CoUninitialize ();
return nullptr;
}
GstMMDeviceEnumerator *
gst_mm_device_enumerator_new (void)
{
GstMMDeviceEnumerator *self;
self = (GstMMDeviceEnumerator *) g_object_new (GST_TYPE_MM_DEVICE_ENUMERATOR,
nullptr);
if (!self->handle) {
gst_object_unref (self);
return nullptr;
}
gst_object_ref_sink (self);
return self;
}
IMMDeviceEnumerator *
gst_mm_device_enumerator_get_handle (GstMMDeviceEnumerator * enumerator)
{
g_return_val_if_fail (GST_IS_MM_DEVICE_ENUMERATOR (enumerator), nullptr);
return enumerator->handle;
}
typedef struct
{
GstMMDeviceEnumerator *self;
GstMMNotificationClientCallbacks *callbacks;
gpointer user_data;
gboolean handled;
GMutex lock;
GCond cond;
gboolean ret;
} SetNotificationCallbackData;
static gboolean
set_notification_callback (SetNotificationCallbackData * data)
{
GstMMDeviceEnumerator *self = data->self;
HRESULT hr;
g_mutex_lock (&data->lock);
g_mutex_lock (&self->lock);
data->ret = TRUE;
if (self->client) {
self->handle->UnregisterEndpointNotificationCallback (self->client);
self->client->Release ();
self->client = nullptr;
}
if (data->callbacks) {
IMMNotificationClient *client;
hr = GstIMMNotificationClient::CreateInstance (self, data->callbacks,
data->user_data, &client);
if (FAILED (hr)) {
GST_ERROR_OBJECT (self,
"Failed to create IMMNotificationClient instance");
data->ret = FALSE;
goto out;
}
hr = self->handle->RegisterEndpointNotificationCallback (client);
if (FAILED (hr)) {
GST_ERROR_OBJECT (self, "Failed to register callback");
client->Release ();
data->ret = FALSE;
goto out;
}
self->client = client;
}
out:
data->handled = TRUE;
g_cond_signal (&data->cond);
g_mutex_unlock (&self->lock);
g_mutex_unlock (&data->lock);
return G_SOURCE_REMOVE;
}
gboolean
gst_mm_device_enumerator_set_notification_callback (GstMMDeviceEnumerator *
enumerator, GstMMNotificationClientCallbacks * callbacks,
gpointer user_data)
{
SetNotificationCallbackData data;
gboolean ret;
g_return_val_if_fail (GST_IS_MM_DEVICE_ENUMERATOR (enumerator), FALSE);
data.self = enumerator;
data.callbacks = callbacks;
data.user_data = user_data;
data.handled = FALSE;
g_mutex_init (&data.lock);
g_cond_init (&data.cond);
g_main_context_invoke (enumerator->context,
(GSourceFunc) set_notification_callback, &data);
g_mutex_lock (&data.lock);
while (!data.handled)
g_cond_wait (&data.cond, &data.lock);
g_mutex_unlock (&data.lock);
ret = data.ret;
g_mutex_clear (&data.lock);
g_cond_clear (&data.cond);
return ret;
}