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/* GStreamer
* Copyright (C) 2025 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.
*/
#include "gstwasapi2activator.h"
#include <objidl.h>
GST_DEBUG_CATEGORY_EXTERN (gst_wasapi2_debug);
#define GST_CAT_DEFAULT gst_wasapi2_debug
/* *INDENT-OFF* */
using namespace Microsoft::WRL;
void
Wasapi2ActivationHandler::CreateInstance (Wasapi2ActivationHandler ** handler,
const wchar_t * device_id,
const AUDIOCLIENT_ACTIVATION_PARAMS * params)
{
auto self = new Wasapi2ActivationHandler ();
self->device_id_ = device_id;
if (params) {
self->params_ = *params;
self->prop_.vt = VT_BLOB;
self->prop_.blob.cbSize = sizeof (AUDIOCLIENT_ACTIVATION_PARAMS);
self->prop_.blob.pBlobData = (BYTE *) &self->params_;
self->have_params_ = true;
}
*handler = self;
}
STDMETHODIMP_ (ULONG)
Wasapi2ActivationHandler::AddRef (void)
{
return InterlockedIncrement (&refcount_);
}
STDMETHODIMP_ (ULONG)
Wasapi2ActivationHandler::Release (void)
{
ULONG ref_count;
ref_count = InterlockedDecrement (&refcount_);
if (ref_count == 0)
delete this;
return ref_count;
}
STDMETHODIMP
Wasapi2ActivationHandler::QueryInterface (REFIID riid, void ** object)
{
if (riid == __uuidof(IUnknown) || riid == __uuidof(IAgileObject)) {
*object = static_cast<IUnknown *>(static_cast<Wasapi2ActivationHandler*>(this));
} else if (riid == __uuidof(IActivateAudioInterfaceCompletionHandler)) {
*object = static_cast<IActivateAudioInterfaceCompletionHandler *>(
static_cast<Wasapi2ActivationHandler*>(this));
} else if (riid == IID_Wasapi2ActivationHandler) {
*object = this;
} else {
*object = nullptr;
return E_NOINTERFACE;
}
AddRef ();
return S_OK;
}
STDMETHODIMP
Wasapi2ActivationHandler::ActivateCompleted (IActivateAudioInterfaceAsyncOperation * op)
{
ComPtr<IUnknown> iface;
HRESULT hr = S_OK;
HRESULT activate_hr = S_OK;
hr = op->GetActivateResult (&activate_hr, &iface);
if (!gst_wasapi2_result (hr))
GST_WARNING ("Couldn't get activate result, hr: 0x%x", (guint) hr);
if (!gst_wasapi2_result (activate_hr)) {
GST_WARNING ("GetActivateResult failed, hr: 0x%x", (guint) activate_hr);
hr = activate_hr;
}
if (SUCCEEDED (hr) && !iface) {
GST_ERROR ("Couldn't get inteface from asyncop");
hr = E_FAIL;
}
if (FAILED (hr)) {
activate_hr_ = hr;
SetEvent (event_);
return hr;
}
{
std::lock_guard<std::mutex> lk (lock_);
hr = iface.As (&client_);
activate_hr_ = hr;
}
GST_LOG ("Activation result 0x%x", (guint) hr);
SetEvent (event_);
return hr;
}
HRESULT
Wasapi2ActivationHandler::ActivateAsync ()
{
ComPtr<IActivateAudioInterfaceAsyncOperation> async_op;
auto hr = ActivateAudioInterfaceAsync (device_id_.c_str (),
__uuidof (IAudioClient), have_params_ ? &prop_ : nullptr,
this, &async_op);
if (!gst_wasapi2_result (hr)) {
activate_hr_ = hr;
SetEvent (event_);
}
return hr;
}
HRESULT
Wasapi2ActivationHandler::GetClient (IAudioClient ** client, DWORD timeout)
{
WaitForSingleObject (event_, timeout);
auto hr = activate_hr_.load ();
if (!gst_wasapi2_result (hr))
return hr;
if (!client)
return S_OK;
std::lock_guard<std::mutex> lk (lock_);
if (!client_)
return E_FAIL;
*client = client_.Get ();
(*client)->AddRef ();
return S_OK;
}
Wasapi2ActivationHandler::Wasapi2ActivationHandler ()
{
event_ = CreateEvent (nullptr, TRUE, FALSE, nullptr);
}
Wasapi2ActivationHandler::~Wasapi2ActivationHandler ()
{
CloseHandle (event_);
}
/* *INDENT-ON* */
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