Windows Media Foundation:IMFCaptureEngine:：TakePhoto-采样等待时间过长 我在我的C++应用中使用Window Media基金会来拍摄照片。 我的问题是等待取样的时间太长
拍照的算法：Windows Media Foundation:IMFCaptureEngine:：TakePhoto-采样等待时间过长 我在我的C++应用中使用Window Media基金会来拍摄照片。 我的问题是等待取样的时间太长,c++,winapi,image-processing,video,ms-media-foundation,C++,Winapi,Image Processing,Video,Ms Media Foundation,拍照的算法： 配置预览（帧大小，例如640 x 480） 开始预览 用户向teke photo调用请求 调用我的方法ConfigurePhoto（帧大小，例如2560 x 1920） 调用IMFCaptureEngine:：TakePhoto 要接收照片应用程序，请使用实现接口IMFCaptureEngineOnSampleCallback的my类。 它等待调用HRESULT STDMETHODCALLTYPE CaptureEngineSampleCB:：OnSample（IMFSample*
HRESULT CaptureDevice::ConfigurePhoto(INT resolutionId, ConfigurationType configureType)
{
HRESULT hr = S_OK;
{
IMFCaptureSink *pSink = NULL;
IMFMediaSink *p = NULL;
UINT32 width, height;
// Get a pointer to the photo sink.
HRESULT hr = m_pEngine->GetSink(MF_CAPTURE_ENGINE_SINK_TYPE_PHOTO, &pSink);
if (SUCCEEDED(hr))
{
IMFCapturePhotoSink *pPhoto = NULL;
hr = pSink->QueryInterface(IID_PPV_ARGS(&pPhoto));
if (SUCCEEDED(hr))
{
IMFCaptureSource *pSource;
hr = m_pEngine->GetSource(&pSource);
if (SUCCEEDED(hr))
{
IMFMediaType *pMediaType = 0;
hr = pSource->GetAvailableDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, resolutionId, &pMediaType);
if (SUCCEEDED(hr))
{
LogMediaType(pMediaType);
hr = pSource->SetCurrentDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, pMediaType);
if (SUCCEEDED(hr))
{
if (WaitForMediaTypeChange())
{
IMFMediaType *pMediaType = 0;
//Utils::SafeRelease(&pMediaType);
hr = pSource->GetCurrentDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, &pMediaType);
if (SUCCEEDED(hr))
{
hr = MFGetAttributeSize(pMediaType, MF_MT_FRAME_SIZE, &width, &height);
IMFMediaType *pPhotoMediaType = 0;
LONG bufferStride = 0;
//Configure the photo format
hr = Utils::CreateSnapshotMediaTypeForCB(pMediaType, &pPhotoMediaType, bufferStride);
if (SUCCEEDED(hr))
{
//LogMediaType(pPhotoMediaType);
if (SUCCEEDED(hr))
{
hr = pPhoto->RemoveAllStreams();
if (SUCCEEDED(hr))
{
DWORD dwSinkStreamIndex;
// Try to connect the first still image stream to the photo sink
hr = pPhoto->AddStream((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, pPhotoMediaType, NULL, &dwSinkStreamIndex);
if (SUCCEEDED(hr))
{
hr = pPhoto->SetSampleCallback(m_pSampleCallback);
if (SUCCEEDED(hr))
{
hr = pPhoto->Prepare();
if (SUCCEEDED(hr))
{
if (!WaitForCaptureSinkPrepare())
{
hr = E_FAIL;
}
}
}
}
}
}
Utils::SafeRelease(&pPhotoMediaType);
}
}
Utils::SafeRelease(&pMediaType);
}
else
{
hr = E_FAIL;
}
}
Utils::SafeRelease(&pMediaType);
}
Utils::SafeRelease(&pSource);
}
Utils::SafeRelease(&pPhoto);
}
Utils::SafeRelease(&pSink);
}
/* ... other action */
}
return hr;
}
HRESULT CaptureDevice::CreatePreview(INT previewRresolutionId, HWND hWnd, BOOL mirror)
{
HRESULT hr = S_OK;
DWORD dwSinkStreamIndex = 0;
UINT32 w, h;
LONG lStride = 0;
if (m_pPreview == NULL)
{
IMFCaptureSink *pSink = NULL;
hr = m_pEngine->GetSink(MF_CAPTURE_ENGINE_SINK_TYPE_PREVIEW, &pSink);
if (SUCCEEDED(hr))
{
hr = pSink->QueryInterface(IID_PPV_ARGS(&m_pPreview));
if (SUCCEEDED(hr))
{
//if (m_useDirect3D)
{
hr = m_pPreview->SetMirrorState(mirror);
m_previewWnd = PreviewWindow::CreatePreviewWindow(*this, hWnd);
hr = m_pPreview->SetRenderHandle(m_previewWnd);
}
if (SUCCEEDED(hr))
{
IMFCaptureSource* pSource = NULL;
hr = m_pEngine->GetSource(&pSource);
if (SUCCEEDED(hr))
{
IMFMediaType *pMediaType = NULL;
// Configure the video format for the preview sink.
hr = pSource->GetAvailableDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_PREVIEW, previewRresolutionId, &pMediaType);
if (SUCCEEDED(hr))
{
LogMediaType(pMediaType);
//hr = Utils::SetDefaultStride(pMediaType, &lStride);
hr = pSource->SetCurrentDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_PREVIEW, pMediaType);
if (SUCCEEDED(hr))
{
WaitForMediaTypeChange();
IMFMediaType *pMediaType2 = NULL;
hr = Utils::CloneVideoMediaType(pMediaType, MFVideoFormat_RGB24, &pMediaType2);
if (SUCCEEDED(hr))
{
hr = pMediaType2->SetUINT32(MF_MT_ALL_SAMPLES_INDEPENDENT, TRUE);
if (SUCCEEDED(hr))
{
// Connect the video stream to the preview sink.
hr = m_pPreview->AddStream((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_PREVIEW, pMediaType2, NULL, &dwSinkStreamIndex);
}
}
Utils::SafeRelease(&pMediaType2);
}
}
Utils::SafeRelease(&pMediaType);
}
Utils::SafeRelease(&pSource);
}
}
}
Utils::SafeRelease(&pSink);
if (FAILED(hr))
{
Utils::SafeRelease(&m_pPreview);
}
}
return hr;
}
MF_MT_FRAME_SIZE 640 x 480
MF_MT_AVG_BITRATE 110592000
MF_MT_MAJOR_TYPE MFMediaType_Video
MF_MT_DEFAULT_STRIDE 640
MF_MT_AM_FORMAT_TYPE {05589F80-C356-11CE-BF01-00AA0055595A}
MF_MT_FIXED_SIZE_SAMPLES 1
MF_MT_FRAME_RATE 30000 x 1001
MF_MT_PIXEL_ASPECT_RATIO 1 x 1
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_FRAME_RATE_RANGE_MIN 30000 x 1001
MF_MT_SAMPLE_SIZE 460800
MF_MT_INTERLACE_MODE 2
MF_MT_FRAME_RATE_RANGE_MAX 30000 x 1001
MF_MT_SUBTYPE MFVideoFormat_NV12
captionSource->GetAvailableDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_PREVIEW, mediaTypeIndex /* chosen by user index 0*/, &pMediaType);
captionSource->GetAvailableDeviceMediaType( (DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, mediaTypeIndex /* chosen by user index 16*/, &pMediaType);
MF_MT_FRAME_SIZE 2560 x 1920
MF_MT_MAJOR_TYPE MFMediaType_Image
MF_MT_AM_FORMAT_TYPE {692FA379-D3E8-4651-B5B4-0B94B013EEAF}
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_SUBTYPE {19E4A5AA-5662-4FC5-A0C0-1758028E1057}
captionSource->GetAvailableDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_PREVIEW, mediaTypeIndex /* chosen by user index 0*/, &pMediaType);
captionSource->GetAvailableDeviceMediaType( (DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_PHOTO, mediaTypeIndex /* chosen by user index 16*/, &pMediaType);