我正在尝试使用视频处理器MFT进行一些基本的色彩空间转换。我的相机本机支持NV12，我需要RGB24，以编写一些可以提供类似卡通效果的着色器。
这是用于执行MF的Media类的定义。
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"python.unitTest.unittestArgs": [
"-v",
"-s",
".",
"-p",
"*Test*.py"
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"python.unitTest.pyTestEnabled": false,
"python.unitTest.nosetestsEnabled": false,
"python.unitTest.unittestEnabled": true
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我通过以下方式进行IMFTransform的设置：
class Media : public IMFSourceReaderCallback //this class inhertis from IMFSourceReaderCallback
{
CRITICAL_SECTION criticalSection;
long referenceCount;
WCHAR *wSymbolicLink;
UINT32 cchSymbolicLink;
IMFSourceReader* sourceReader;
MFT_REGISTER_TYPE_INFO *inputVideoTypes;
MFT_REGISTER_TYPE_INFO *outputVideoTypes;
IMFMediaType* mediaType = NULL;
IMFMediaType* streamType = NULL;
IMFMediaType* streamType2 = NULL;
IMFMediaType* streamType3 = NULL;
IMFTransform **VP;
public:
LONG stride;
float bytesPerPixel;
GUID videoFormat;
UINT height;
UINT width;
WCHAR deviceNameString[2048];
BYTE* rawData;
UINT32 count;
DWORD devices_found = 0;
HRESULT CreateCaptureDevice();
HRESULT SetSourceReader(IMFActivate *device);
HRESULT IsMediaTypeSupported(IMFMediaType* type);
HRESULT GetDefaultStride(IMFMediaType *pType, LONG *plStride);
HRESULT Close();
Media();
~Media();
// the class must implement the methods from IUnknown
STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
// the class must implement the methods from IMFSourceReaderCallback
STDMETHODIMP OnReadSample(HRESULT status, DWORD streamIndex, DWORD streamFlags, LONGLONG timeStamp, IMFSample *sample);
STDMETHODIMP OnEvent(DWORD, IMFMediaEvent *);
STDMETHODIMP OnFlush(DWORD);
};
问题是SetOutput方法返回：无法找到所需的属性，而我却没有真正得到，这是什么问题。 谁能指出我在哪里做坏事？ 谢谢
编辑：输入的LogMediaType：
inputVideoTypes = new MFT_REGISTER_TYPE_INFO;
inputVideoTypes->guidMajorType = MFMediaType_Video;
inputVideoTypes->guidSubtype = MFVideoFormat_NV12;
outputVideoTypes = new MFT_REGISTER_TYPE_INFO;
outputVideoTypes->guidMajorType = MFMediaType_Video;
outputVideoTypes->guidSubtype = MFVideoFormat_RGB24;
hr = sourceReader->GetNativeMediaType(MF_SOURCE_READER_FIRST_VIDEO_STREAM, i, &streamType2);
IMFActivate **transformActivateArray = NULL;
UINT32 MFTcount;
hr = MFTEnumEx(MFT_CATEGORY_VIDEO_PROCESSOR, MFT_ENUM_FLAG_ALL, inputVideoTypes, outputVideoTypes, &transformActivateArray, &MFTcount);
if (FAILED(hr))
{
exit(3);
}
if (MFTcount == 0)
exit(7);
VP = new IMFTransform*[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
hr = transformActivateArray[i]->ActivateObject(__uuidof(IMFTransform), (void**)&VP[i]);
}
DWORD* inputCount = new DWORD[MFTcount];
DWORD* outputCount = new DWORD[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
hr = VP[i]->GetStreamCount(&inputCount[i], &outputCount[i]);
}
DWORD **inputids = new DWORD*[MFTcount];
DWORD **outputids = new DWORD*[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
inputids[i] = new DWORD[inputCount[i]];
outputids[i] = new DWORD[outputCount[i]];
}
for (DWORD i = 0; i < MFTcount; i++)
{
VP[i]->GetStreamIDs(inputCount[i], inputids[i], outputCount[i], outputids[i]);
if (FAILED(hr))
exit(5);
}
DWORD flag1 = -1;
DWORD flag2 = -1;
for (DWORD i = 0; i < MFTcount; i++)
{
for (DWORD j = 0; j < inputCount[i]; j++)
{
hr = VP[i]->GetInputAvailableType(0, 0, &streamType);
if (SUCCEEDED(hr))
{
flag1 = i;
flag2 = j;
break;
}
}
}
if (flag1 == -1 && flag2 == -1)
exit(2);
hr = VP[0]->SetInputType(0, streamType2, 0);
hr = VP[0]->GetOutputAvailableType(0, 0, &streamType3);
hr = VP[0]->SetOutputType(0, streamType3, 0);
输出日志无效
MF_MT_FRAME_SIZE 1280 x 720
MF_MT_YUV_MATRIX 2
MF_MT_MAJOR_TYPE MFMediaType_Video
MF_MT_VIDEO_LIGHTING 3
MF_MT_VIDEO_CHROMA_SITING 1
MF_MT_AM_FORMAT_TYPE {F72A76A0-EB0A-11D0-ACE4-0000C0CC16BA}
MF_MT_FIXED_SIZE_SAMPLES 1
MF_MT_VIDEO_NOMINAL_RANGE 1
MF_MT_FRAME_RATE 30 x 1
MF_MT_PIXEL_ASPECT_RATIO 1 x 1
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_FRAME_RATE_RANGE_MIN 128849018881
MF_MT_VIDEO_PRIMARIES 2
MF_MT_INTERLACE_MODE 2
MF_MT_FRAME_RATE_RANGE_MAX 128849018881
{EA031A62-8BBB-43C5-B5C4-572D2D231C18} 1
MF_MT_SUBTYPE MFVideoFormat_NV12
EDIT2
我只有一个由EnumEx方法枚举的VP，并且它具有固定数量的输入（1）和输出（1）流，因此以前的日志是唯一一个用于输入的日志
编辑3
Exception thrown: read access violation.
**pType** was nullptr.
和onReadSample方法中的处理如下：
hr = VP->SetInputType(0, streamType2, 0);
//MediaFoundationSamples::LogMediaType(streamType2);
DWORD dwIndex = 4;
hr = VP->GetOutputAvailableType(0, dwIndex, &streamType3);
hr = MFSetAttributeSize(streamType3, MF_MT_FRAME_SIZE, 1280, 720);
hr = streamType3->SetUINT32(MF_MT_FIXED_SIZE_SAMPLES, 1);
hr = MFSetAttributeRatio(streamType3, MF_MT_FRAME_RATE, 30, 1);
hr = MFSetAttributeRatio(streamType3, MF_MT_PIXEL_ASPECT_RATIO, 1, 1);
streamType3->SetUINT32(MF_MT_ALL_SAMPLES_INDEPENDENT, 1);
streamType3->SetUINT32(MF_MT_INTERLACE_MODE, 2);
MediaFoundationSamples::LogMediaType(streamType3);
hr = VP->SetOutputType(0, streamType3, 0);
hr = VP->GetInputStreamInfo(0, &InputInfo);
hr = VP->GetOutputStreamInfo(0, &OutputInfo);
答案 0 :(得分：1)
从Mediafoundation示例中，您具有LogMediaType函数LogMediaType
您可以显示streamType2 / streamType3的日志吗？
还可以从此处video-format-attributes
检查现有的视频媒体类型它可以帮助您找到缺少的属性。
EDIT1
因为我使用Windows 7，所以没有视频处理器MFT。我使用Color Converter DSP，他也可以进行色彩空间转换Color Converter DSP
IMFTransform* pVideoColorConverter = NULL;
IMFMediaType* pVideoOutputType = NULL;
// RGB24 media type at index 10, but can be different on your system
DWORD dwRGB24Index = 10;
hr = CoCreateInstance(CLSID_CColorConvertDMO, NULL, CLSCTX_INPROC_SERVER, IID_IMFTransform, reinterpret_cast<void**>(&pVideoColorConverter);
hr = pVideoColorConverter->SetInputType(0, pVideoInputType, 0);
hr = pVideoColorConverter->GetOutputAvailableType(0, dwRGB24Index, &pVideoOutputType);
hr = pVideoColorConverter->SetOutputType(0, pVideoOutputType, 0);
LogMediaType(pVideoInputType);
LogMediaType(pVideoOutputType);
这是日志：
pVideoInputType (my camera provide YUY2 not NV12) :
MF_MT_MAJOR_TYPE MFMediaType_Video
MF_MT_SUBTYPE MFVideoFormat_YUY2
MF_MT_FRAME_SIZE 640 x 480
MF_MT_DEFAULT_STRIDE 1280
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_FIXED_SIZE_SAMPLES 1
MF_MT_SAMPLE_SIZE 614400
MF_MT_AVG_BITRATE 147456000
MF_MT_FRAME_RATE 30 x 1
MF_MT_PIXEL_ASPECT_RATIO 1 x 1
MF_MT_INTERLACE_MODE 2
MF_MT_AM_FORMAT_TYPE {05589F80-C356-11CE-BF01-00AA0055595A}
MF_MT_FRAME_RATE_RANGE_MAX 128849018881
MF_MT_FRAME_RATE_RANGE_MIN 42949672961333333
pVideoOutputType :
MF_MT_MAJOR_TYPE MFMediaType_Video
MF_MT_SUBTYPE MFVideoFormat_RGB24
MF_MT_FRAME_SIZE 640 x 480
MF_MT_FRAME_RATE 10000000 x 333333
MF_MT_GEOMETRIC_APERTURE <<byte array>>
MF_MT_PIXEL_ASPECT_RATIO 1 x 1
MF_MT_INTERLACE_MODE 2
MF_MT_DEFAULT_STRIDE 1920
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_FIXED_SIZE_SAMPLES 1
MF_MT_SAMPLE_SIZE 921600
EDIT2
好的，您的视频输入类型似乎正确。
您现在可以记录所有VP的所有输入类型（streamType）了吗？
DWORD* inputCount = new DWORD[MFTcount];
DWORD* outputCount = new DWORD[MFTcount];
for(DWORD i = 0; i < MFTcount; i++){
hr = VP[i]->GetStreamCount(&inputCount[i], &outputCount[i]);
if(FAILED(hr)){
exit(3);
}
}
DWORD** inputids = new DWORD*[MFTcount];
DWORD** outputids = new DWORD*[MFTcount];
for(DWORD i = 0; i < MFTcount; i++){
inputids[i] = new DWORD[inputCount[i]];
outputids[i] = new DWORD[outputCount[i]];
}
for(DWORD i = 0; i < MFTcount; i++){
hr = VP[i]->GetStreamIDs(inputCount[i], inputids[i], outputCount[i], outputids[i]);
// By convention, if an MFT has exactly one fixed input stream and one fixed output stream, it should assign the identifier 0 to both streams
if(hr == E_NOTIMPL && inputCount[i] == 1 && outputCount[i] == 1){
inputids[i][0] = 0;
outputids[i][0] = 0;
}
else if(FAILED(hr)){
exit(4);
}
}
for(DWORD i = 0; i < MFTcount; i++){
// todo : log VP = i
for(DWORD j = 0; j < inputCount[i]; j++){
// todo : log stream id = inputids[i][j]
DWORD dwTypeIndex = 0;
hr = S_OK;
while(hr == S_OK){
// todo :log dwTypeIndex
hr = VP[i]->GetInputAvailableType(inputids[i][j], dwTypeIndex, &streamType);
if(SUCCEEDED(hr)){
LogMediaType(streamType);
SAFE_RELEASE(streamType);
dwTypeIndex++;
}
else{
// todo : check hr, should be MF_E_NO_MORE_TYPES
// if hr == E_NOTIMPL/MF_E_INVALIDSTREAMNUMBER... should be error
}
}
}
}
EDIT3
这里是视频处理器MFT的使用：VideoProcessor MTF sample
似乎您需要在使用它之前先提供一个D3DManager（HRESULT DX11VideoRenderer :: CPresenter :: CreateXVP（void）->第1118行）
我不确定D3DManager，因为我无法在系统上对其进行测试。
hr = CoCreateInstance(CLSID_VideoProcessorMFT, nullptr, CLSCTX_INPROC_SERVER, IID_IMFTransform, (void**)&m_pXVP);
if (FAILED(hr))
{
break;
}
hr = m_pXVP->ProcessMessage(MFT_MESSAGE_SET_D3D_MANAGER, ULONG_PTR(m_pDXGIManager));
if (FAILED(hr))
{
break;
}
// Tell the XVP that we are the swapchain allocator
hr = m_pXVP->GetAttributes(&pAttributes);
if (FAILED(hr))
{
break;
}
hr = pAttributes->SetUINT32(MF_XVP_PLAYBACK_MODE, TRUE);
if (FAILED(hr))
{
break;
}
从代码中检查所有m_pXVP和m_pXVPControl。
EDIT4
根据您的inputType，尝试手动创建outputType，并添加以下属性：
MF_MT_MAJOR_TYPE MFMediaType_Video
MF_MT_SUBTYPE MFVideoFormat_RGB24
MF_MT_FRAME_SIZE 1280 x 720
MF_MT_FIXED_SIZE_SAMPLES 1
MF_MT_FRAME_RATE 30 x 1
MF_MT_PIXEL_ASPECT_RATIO 1 x 1
MF_MT_ALL_SAMPLES_INDEPENDENT 1
MF_MT_INTERLACE_MODE 2
因此，在SetInputType之后，创建视频媒体输出类型，然后使用此新的mediaType调用SetOutputType。
您只能先尝试使用MF_MT_MAJOR_TYPE / MF_MT_SUBTYPE / MF_MT_FRAME_SIZE，然后再添加一个。