The following code utilizes ltmmSampleTarget and ltmmConvert to generate multiple device independent bitmaps from an AVI file.
#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\LEADTOOLS 17.5\\Media\\")TEXT(pFileName)) #include "stdafx.h" // include the LEAD Multimedia TOOLKIT header #include "ltmm.h" // include amvideo.h for VIDEOINFOHEADER, available in the Visual Studio 6.0 or the DirectX SDK #include <amvideo.h> // includes for string handling #include <tchar.h> #include <wchar.h> #include <string.h> #include <stdio.h> ///////////////////////////////////////////////////////////////// // SaveBMP24 // saves a bitmap to a file (supports only 24 BPP) // pszFile - output file name // pHeader - BITMAPINFOHEADER // pBits - bitmap image data // BOOL SaveBMP24(LPCWSTR pszFile, BITMAPINFOHEADER* pHeader, void* pBits) { HANDLE hFile; TCHAR szFile[MAX_PATH]; BITMAPFILEHEADER bfh; DWORD nWritten; #if defined(_UNICODE) wcscpy(szFile, pszFile); #else WideCharToMultiByte(CP_ACP, 0, pszFile, -1, szFile, MAX_PATH, NULL, NULL); #endif hFile = CreateFile(szFile, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if(hFile == INVALID_HANDLE_VALUE) return FALSE; bfh.bfType = 0x4D42; bfh.bfOffBits = sizeof(bfh) + pHeader->biSize; bfh.bfSize = bfh.bfOffBits + pHeader->biSizeImage; bfh.bfReserved1 = 0; bfh.bfReserved2 = 0; if(!WriteFile(hFile, &bfh, sizeof(bfh), &nWritten, NULL) || nWritten != sizeof(bfh)) { CloseHandle(hFile); return FALSE; } if(!WriteFile(hFile, pHeader, pHeader->biSize, &nWritten, NULL) || nWritten != pHeader->biSize) { CloseHandle(hFile); return FALSE; } if(!WriteFile(hFile, pBits, pHeader->biSizeImage, &nWritten, NULL) || nWritten != pHeader->biSizeImage) { CloseHandle(hFile); return FALSE; } CloseHandle(hFile); return TRUE; } ///////////////////////////////////////////////////////////////// // SplitAvi // splits an avi file into individual BMP files // pszAviFile - source file name // pszOutputDir - directory of output BMP files (split?.bmp) // nMaxFrames - maximum number of BMP files (frames) to generate // HRESULT SplitAvi(LPCWSTR pszAviFile, LPCWSTR pszOutputDir, int nMaxFrames) { HRESULT hr; IltmmConvert* pConvert = NULL; IltmmSampleTarget* pSampleTarget = NULL; IltmmMediaTypeDisp* pMediaType = NULL; IltmmMediaSampleDisp* pMediaSample; VARIANT varFormat; VARIANT varBuffer; VIDEOINFOHEADER* pVIH; void* pBuffer; BSTR bstr; int n; WCHAR szFile[MAX_PATH]; // initialize COM library hr = CoInitialize(NULL); if(FAILED(hr)) goto error; // create the convert object hr = CoCreateInstance(CLSID_ltmmConvert, NULL, CLSCTX_INPROC_SERVER, IID_IltmmConvert, (void**) &pConvert); if(FAILED(hr)) goto error; // create the target object hr = CoCreateInstance(CLSID_ltmmSampleTarget, NULL, CLSCTX_INPROC_SERVER, IID_IltmmSampleTarget, (void**) &pSampleTarget); if(FAILED(hr)) goto error; // create the media type object hr = CoCreateInstance(CLSID_ltmmMediaType, NULL, CLSCTX_INPROC_SERVER, IID_IltmmMediaTypeDisp, (void**) &pMediaType); if(FAILED(hr)) goto error; // set type to MEDIATYPE_Video bstr = SysAllocString(L"{73646976-0000-0010-8000-00AA00389B71}"); hr = pMediaType->put_Type(bstr); SysFreeString(bstr); if(FAILED(hr)) goto error; // set subtype to MEDIASUBTYPE_RGB24 bstr = SysAllocString(L"{e436eb7d-524f-11ce-9f53-0020af0ba770}"); hr = pMediaType->put_Subtype(bstr); SysFreeString(bstr); if(FAILED(hr)) goto error; // set the accepted media type hr = pSampleTarget->SetAcceptedMediaType(pMediaType); if(FAILED(hr)) goto error; hr = pSampleTarget->put_TargetFormat((long)ltmmSampleTarget_TargetFormat_Undefined); // pass a value here that matches the expect output format, or undefined to accept default pMediaType->Release(); pMediaType = NULL; #ifdef _DEBUG // get it back for debugging hr = pSampleTarget->GetAcceptedMediaType(&pMediaType); if(FAILED(hr)) goto error; pMediaType->Release(); pMediaType = NULL; #endif // set the convert input file name bstr = SysAllocString(pszAviFile); hr = pConvert->put_SourceFile(bstr); SysFreeString(bstr); if(FAILED(hr)) goto error; // set the convert object target hr = pConvert->put_TargetObject(pSampleTarget); if(FAILED(hr)) goto error; // start the conversion hr = pConvert->StartConvert(); if(FAILED(hr)) goto error; // get the connected media type hr = pSampleTarget->GetConnectedMediaType(&pMediaType); if(FAILED(hr)) goto error; // get the VIDEOINFOHEADER hr = pMediaType->get_Format(&varFormat); if(FAILED(hr)) goto error; hr = SafeArrayAccessData(V_ARRAY(&varFormat), (void**) &pVIH); if(FAILED(hr)) { VariantClear(&varFormat); goto error; } for(n = 0; n < nMaxFrames; n++) { // fetch a sample hr = pSampleTarget->GetSample(1000, &pMediaSample); if(FAILED(hr) || !pMediaSample) break; // access the image bits hr = pMediaSample->get_Buffer(&varBuffer); if(FAILED(hr)) { pMediaSample->Release(); goto converterror; } hr = SafeArrayAccessData(V_ARRAY(&varBuffer), &pBuffer); if(FAILED(hr)) { VariantClear(&varBuffer); pMediaSample->Release(); goto converterror; } // save the image swprintf(szFile, L"%ssplit%u.bmp", pszOutputDir, n + 1); if(!SaveBMP24(szFile, &pVIH->bmiHeader, pBuffer)) { SafeArrayUnaccessData(V_ARRAY(&varBuffer)); VariantClear(&varBuffer); pMediaSample->Release(); hr = E_FAIL; goto error; } SafeArrayUnaccessData(V_ARRAY(&varBuffer)); VariantClear(&varBuffer); pMediaSample->Release(); } // stop hr = pConvert->StopConvert(); if(FAILED(hr)) goto converterror; // cleanup and exit hr = S_OK;converterror: SafeArrayUnaccessData(V_ARRAY(&varFormat)); VariantClear(&varFormat); error: if(pConvert) pConvert->Release(); if(pSampleTarget) pSampleTarget->Release(); if(pMediaType) pMediaType->Release(); CoUninitialize(); return hr; } int main(int argc, char* argv[]) { SplitAvi((OLECHAR*)MAKE_MEDIA_PATH("count.avi"), (OLECHAR*)MAKE_MEDIA_PATH(""), 10); return 0; }