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_OK
s out...