IMFTransform interface of Color Converter DSP giving E_INVALIDARG on SetInputType/SetOutputType

问题:

I'm trying to use Color Converter DMO (http://msdn.microsoft.com/en-us/library/windows/desktop/ff819079(v=vs.85).aspx) to convert RBG24 to YV12/NV12 via Media Foundation. I've created an instance of Color Converter DSP via CLSID_CColorConvertDMO and then tried to set the needed input/output types, but the calls always return E_INVALIDARG even when using media types that are returned by GetOutputAvailableType and GetInputAvailableType. If I set the media type to NULL then i get the error that the media type is invalid, that makes sense. I've seen examples from MSDN, where people do the same - enumerate available types and then set them as input types - and they claim it works, but i'm kinda stuck on the E_INVALIDARG. I understand that this is hard to answer without a code example, if no one has had similar experience, I'll try to post a snipplet, but maybe someone has experienced the same issue?

回答1:

This DMO/DSP is dual interfaced and is both a DMO with IMediaObject and an MFT with IMFTransform. The two interfaces share a lot common, and here is a code snippet to test initialization of RGB24 into YV12 conversion:

#include "stdafx.h" #include <dshow.h> #include <dmo.h> #include <wmcodecdsp.h>  #pragma comment(lib, "strmiids.lib") #pragma comment(lib, "wmcodecdspuuid.lib")  int _tmain(int argc, _TCHAR* argv[]) {     ATLVERIFY(SUCCEEDED(CoInitialize(NULL)));     CComPtr<IMediaObject> pMediaObject;     ATLVERIFY(SUCCEEDED(pMediaObject.CoCreateInstance(CLSID_CColorConvertDMO)));     VIDEOINFOHEADER InputVideoInfoHeader;     ZeroMemory(&InputVideoInfoHeader, sizeof InputVideoInfoHeader);     InputVideoInfoHeader.bmiHeader.biSize = sizeof InputVideoInfoHeader.bmiHeader;     InputVideoInfoHeader.bmiHeader.biWidth = 1920;     InputVideoInfoHeader.bmiHeader.biHeight = 1080;     InputVideoInfoHeader.bmiHeader.biPlanes = 1;     InputVideoInfoHeader.bmiHeader.biBitCount = 24;     InputVideoInfoHeader.bmiHeader.biCompression = BI_RGB;     InputVideoInfoHeader.bmiHeader.biSizeImage = 1080 * (1920 * 3);     DMO_MEDIA_TYPE InputMediaType;     ZeroMemory(&InputMediaType, sizeof InputMediaType);     InputMediaType.majortype = MEDIATYPE_Video;     InputMediaType.subtype = MEDIASUBTYPE_RGB24;     InputMediaType.bFixedSizeSamples = TRUE;     InputMediaType.bTemporalCompression = FALSE;     InputMediaType.lSampleSize = InputVideoInfoHeader.bmiHeader.biSizeImage;     InputMediaType.formattype = FORMAT_VideoInfo;     InputMediaType.cbFormat = sizeof InputVideoInfoHeader;     InputMediaType.pbFormat = (BYTE*) &InputVideoInfoHeader;     const HRESULT nSetInputTypeResult = pMediaObject->SetInputType(0, &InputMediaType, 0);     _tprintf(_T("nSetInputTypeResult 0x%08x\n"), nSetInputTypeResult);     VIDEOINFOHEADER OutputVideoInfoHeader = InputVideoInfoHeader;     OutputVideoInfoHeader.bmiHeader.biBitCount = 12;     OutputVideoInfoHeader.bmiHeader.biCompression = MAKEFOURCC('Y', 'V', '1', '2');     OutputVideoInfoHeader.bmiHeader.biSizeImage = 1080 * 1920 * 12 / 8;     DMO_MEDIA_TYPE OutputMediaType = InputMediaType;     OutputMediaType.subtype = MEDIASUBTYPE_YV12;     OutputMediaType.lSampleSize = OutputVideoInfoHeader.bmiHeader.biSizeImage;     OutputMediaType.cbFormat = sizeof OutputVideoInfoHeader;     OutputMediaType.pbFormat = (BYTE*) &OutputVideoInfoHeader;     const HRESULT nSetOutputTypeResult = pMediaObject->SetOutputType(0, &OutputMediaType, 0);     _tprintf(_T("nSetOutputTypeResult 0x%08x\n"), nSetOutputTypeResult);     // TODO: ProcessInput, ProcessOutput     pMediaObject.Release();     CoUninitialize();     return 0; } 

This should work fine and print two S_OKs out...

文章来源: IMFTransform interface of Color Converter DSP giving E_INVALIDARG on SetInputType/SetOutputType