latency.cpp
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/* akvirtualcamera, virtual camera for Mac and Windows.
* Copyright (C) 2020 Gonzalo Exequiel Pedone
*
* akvirtualcamera is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* akvirtualcamera 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with akvirtualcamera. If not, see <http://www.gnu.org/licenses/>.
*
* Web-Site: http://webcamoid.github.io/
*/
#include <strmif.h>
#include <amvideo.h>
#include <dvdmedia.h>
#include <uuids.h>
#include "latency.h"
#include "PlatformUtils/src/utils.h"
#include "VCamUtils/src/utils.h"
namespace AkVCam
{
class LatencyPrivate
{
public:
IAMStreamConfig *m_streamConfig {nullptr};
};
}
AkVCam::Latency::Latency(IAMStreamConfig *streamConfig):
CUnknown(this, IID_IAMLatency)
{
this->d = new LatencyPrivate;
this->d->m_streamConfig = streamConfig;
}
AkVCam::Latency::~Latency()
{
delete this->d;
}
HRESULT AkVCam::Latency::GetLatency(REFERENCE_TIME *prtLatency)
{
AkLogFunction();
if (!prtLatency)
return E_POINTER;
*prtLatency = 0;
if (this->d->m_streamConfig) {
AM_MEDIA_TYPE *mediaType = nullptr;
if (SUCCEEDED(this->d->m_streamConfig->GetFormat(&mediaType))) {
if (IsEqualGUID(mediaType->formattype, FORMAT_VideoInfo)) {
auto format = reinterpret_cast<VIDEOINFOHEADER *>(mediaType->pbFormat);
*prtLatency = format->AvgTimePerFrame;
} else if (IsEqualGUID(mediaType->formattype, FORMAT_VideoInfo2)) {
auto format = reinterpret_cast<VIDEOINFOHEADER2 *>(mediaType->pbFormat);
*prtLatency = format->AvgTimePerFrame;
}
deleteMediaType(&mediaType);
}
}
return S_OK;
}