737 lines
19 KiB
C++
737 lines
19 KiB
C++
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/****************************************************************************
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*
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* GETFRAME.CPP
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*
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* this file contains the GetFrame APIs
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*
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* AVIStreamGetFrameOpen
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* AVIStreamGetFrameClose
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* AVIStreamGetFrame
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*
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* it also contains the default GetFrame implemenation
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*
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* GetFrameDef
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*
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***************************************************************************/
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#include <win32.h>
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#include <vfw.h>
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#include <memory.h> // for _fmemset
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#include "debug.h" // for good ol' DPF()
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/****************************************************************************
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*
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***************************************************************************/
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//!!! ACK
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#define AVISF_VIDEO_PALCHANGES 0x00010000
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#define ERR_FAIL ResultFromScode(E_FAIL)
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#define ERR_MEMORY ResultFromScode(E_OUTOFMEMORY)
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#define WIDTHBYTES(i) ((UINT)((i+31)&(~31))/8)
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#define DIBWIDTHBYTES(lpbi) (UINT)WIDTHBYTES((UINT)(lpbi)->biWidth * (UINT)(lpbi)->biBitCount)
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/****************************************************************************
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*
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* class for default IGetFrame
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*
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***************************************************************************/
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class FAR GetFrameDef : public IGetFrame
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{
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public:
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GetFrameDef(IAVIStream FAR *pavi=NULL);
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public:
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// IUnknown stuff
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STDMETHODIMP QueryInterface(REFIID riid, LPVOID FAR* ppv);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IGetFrame stuff.
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STDMETHODIMP Begin (LONG lStart, LONG lEnd, LONG lRate);
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STDMETHODIMP End ();
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STDMETHODIMP SetFormat (LPBITMAPINFOHEADER lpbi, LPVOID lpBits, int x, int y, int dx, int dy);
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STDMETHODIMP_(LPVOID) GetFrame (LONG lPos);
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private:
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~GetFrameDef();
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void FreeStuff();
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// for AddRef
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ULONG ulRefCount;
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// instance data.
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BOOL fBegin; // inside of Begin/End
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BOOL fFmtChanges; // file has format changes.
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PAVISTREAM pavi;
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LONG lFrame; // last frame decompressed
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LPVOID lpBuffer; // read buffer.
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LONG cbBuffer; // size of read buffer
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LPVOID lpFormat; // stream format
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LONG cbFormat; // size of format
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LPVOID lpFrame; // the frame (format)
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LPVOID lpBits; // the frame (bits)
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HIC hic; // decompress handle
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BOOL fDecompressEx; // using ICDecompressEx
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int x,y,dx,dy; // where to decompress
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// to watch for the format changing.
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DWORD dwFormatChangeCount;
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DWORD dwEditCount;
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};
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/****************************************************************************
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IUnknown stuff.
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***************************************************************************/
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STDMETHODIMP GetFrameDef::QueryInterface(REFIID riid, LPVOID FAR* ppv)
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{
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if (riid == IID_IGetFrame ||
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riid == IID_IUnknown) { //!!! should we do Unknown or pass on?
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*ppv = (LPVOID)this;
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AddRef();
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return ResultFromScode(S_OK);
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}
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else if (pavi) {
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return pavi->QueryInterface(riid, ppv);
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}
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else {
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*ppv = NULL;
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return ResultFromScode(E_NOINTERFACE);
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}
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}
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STDMETHODIMP_(ULONG) GetFrameDef::AddRef()
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{
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return ulRefCount++;
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}
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STDMETHODIMP_(ULONG) GetFrameDef::Release()
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{
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if (--ulRefCount == 0) {
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delete this;
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return 0;
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}
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return ulRefCount;
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}
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/****************************************************************************
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***************************************************************************/
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GetFrameDef::GetFrameDef(IAVIStream FAR *pavi)
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{
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this->pavi = pavi;
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ulRefCount = 1;
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fBegin = FALSE;
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fFmtChanges = FALSE;
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fDecompressEx = FALSE;
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lFrame = -4242;
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lpBuffer = NULL;
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lpFormat = NULL;
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cbBuffer = 0;
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cbFormat = 0;
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lpFrame = NULL;
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lpBits = NULL;
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hic = NULL;
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if (this->pavi == NULL)
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return;
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pavi->AddRef();
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}
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/****************************************************************************
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***************************************************************************/
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GetFrameDef::~GetFrameDef()
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{
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FreeStuff();
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if (pavi)
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pavi->Release();
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}
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/****************************************************************************
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***************************************************************************/
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void GetFrameDef::FreeStuff()
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{
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if (this->lpFrame && this->lpFrame != this->lpFormat) {
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GlobalFreePtr(this->lpFrame);
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this->lpFrame = 0;
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}
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if (this->lpFormat) {
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GlobalFreePtr(this->lpFormat);
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this->lpFormat = 0;
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}
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if (this->hic) {
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if (this->fDecompressEx)
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ICDecompressExEnd(this->hic);
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else
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ICDecompressEnd(this->hic);
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ICClose(this->hic);
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this->hic = 0;
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}
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}
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/****************************************************************************
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***************************************************************************/
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STDMETHODIMP GetFrameDef::SetFormat(LPBITMAPINFOHEADER lpbi, LPVOID lpBits, int x, int y, int dx, int dy)
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{
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LPBITMAPINFOHEADER lpbiC;
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LPBITMAPINFOHEADER lpbiU;
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LRESULT dw;
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DWORD fccHandler;
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AVISTREAMINFOW info;
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BOOL fScreen;
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//
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// lpbi == AVIGETFRAMEF_BESTDISPLAYFMT means choose the best format for the
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// screen.
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//
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if (fScreen = (lpbi == (LPBITMAPINFOHEADER)AVIGETFRAMEF_BESTDISPLAYFMT))
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lpbi = NULL;
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//
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// get the vital stats
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//
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_fmemset(&info, 0, sizeof(info));
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pavi->Info(&info, sizeof(info));
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//
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// is this a video stream?
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//
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if (info.fccType != streamtypeVIDEO)
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return ERR_FAIL;
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this->fBegin = FALSE;
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this->fFmtChanges = (info.dwFlags & AVISF_VIDEO_PALCHANGES) != 0;
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this->dwEditCount = info.dwEditCount;
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this->dwFormatChangeCount = info.dwFormatChangeCount;
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//
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// get the stream format
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//
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if (this->lpFormat == NULL) {
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//
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// alocate a read buffer.
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//
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this->cbBuffer = (LONG)info.dwSuggestedBufferSize;
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if (this->cbBuffer == 0)
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this->cbBuffer = 1024;
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AVIStreamFormatSize(this->pavi,
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AVIStreamStart(this->pavi),
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&this->cbFormat);
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this->lpFormat = GlobalAllocPtr(GHND,this->cbFormat + this->cbBuffer);
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if (this->lpFormat == NULL)
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goto error;
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AVIStreamReadFormat(this->pavi, AVIStreamStart(this->pavi),
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this->lpFormat, &this->cbFormat);
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this->lpBuffer = (LPBYTE)this->lpFormat+this->cbFormat;
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}
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lpbiC = (LPBITMAPINFOHEADER)this->lpFormat;
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//
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// do standard BITMAPINFO header cleanup!
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//
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if (lpbiC->biClrUsed == 0 && lpbiC->biBitCount <= 8)
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lpbiC->biClrUsed = (1 << (int)lpbiC->biBitCount);
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if (lpbiC->biSizeImage == 0 && lpbiC->biCompression == BI_RGB)
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lpbiC->biSizeImage = DIBWIDTHBYTES(lpbiC) * lpbiC->biHeight;
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//
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// if the stream is uncompressed, we dont need a decompress buffer
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// make sure the caller hs not suggested a format first.
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//
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if (lpbiC->biCompression == 0 && lpBits == NULL) {
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if (lpbi == NULL ||
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(lpbi->biCompression == lpbiC->biCompression &&
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lpbi->biWidth == lpbiC->biWidth &&
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lpbi->biHeight == lpbiC->biHeight &&
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lpbi->biBitCount == lpbiC->biBitCount)) {
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this->lpBits = (LPBYTE)lpbiC + (int)lpbiC->biSize +
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(int)lpbiC->biClrUsed * sizeof(RGBQUAD);
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goto done;
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}
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}
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//
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// alocate the decompress buffer.
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//
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if (this->lpFrame == NULL) {
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this->lpFrame = GlobalAllocPtr(GHND,
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sizeof(BITMAPINFOHEADER)+256*sizeof(RGBQUAD));
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if (this->lpFrame == NULL) {
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DPF("GetFrameInit: Can't allocate frame buffer!\n");
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goto error;
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}
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}
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lpbiC = (LPBITMAPINFOHEADER)this->lpFormat;
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lpbiU = (LPBITMAPINFOHEADER)this->lpFrame;
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if (this->hic == NULL) {
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if (lpbiC->biCompression == 0)
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fccHandler = mmioFOURCC('D','I','B',' ');
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else if (lpbiC->biCompression == BI_RLE8)
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fccHandler = mmioFOURCC('R','L','E',' ');
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else
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fccHandler = info.fccHandler;
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if (lpbi) {
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if (lpbi->biWidth == 0)
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lpbi->biWidth = lpbiC->biWidth;
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if (lpbi->biHeight == 0)
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lpbi->biHeight = lpbiC->biHeight;
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}
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this->hic = ICDecompressOpen(ICTYPE_VIDEO, /*info.fccType,*/
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fccHandler,lpbiC,lpbi);
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if (this->hic == NULL) {
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DPF("GetFrameInit: Can't find decompressor!\n");
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goto error;
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}
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}
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if (lpbi) {
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if (lpbi->biClrUsed == 0 && lpbi->biBitCount <= 8)
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lpbi->biClrUsed = (1 << (int)lpbi->biBitCount);
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hmemcpy(lpbiU,lpbi,lpbi->biSize + lpbi->biClrUsed * sizeof(RGBQUAD));
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if (lpbi->biBitCount <= 8) {
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ICDecompressGetPalette(this->hic,lpbiC,lpbiU);
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}
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} else if (fScreen) {
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ICGetDisplayFormat(this->hic, lpbiC, lpbiU, 0, dx, dy);
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} else {
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dw = ICDecompressGetFormat(this->hic,lpbiC,lpbiU);
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if ((LONG)dw < ICERR_OK)
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goto error;
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}
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//
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// do standard BITMAPINFO header cleanup!
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//
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if (lpbiU->biClrUsed == 0 && lpbiU->biBitCount <= 8)
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lpbiU->biClrUsed = (1 << (int)lpbiU->biBitCount);
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if (lpbiU->biSizeImage == 0 && lpbiU->biCompression == BI_RGB)
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lpbiU->biSizeImage = DIBWIDTHBYTES(lpbiU) * lpbiU->biHeight;
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//
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// if we were passed a bits pointer, use it else re-alloc lpFrame
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// to contain the bits too.
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//
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if (lpBits) {
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this->lpBits = lpBits;
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}
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else {
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this->lpFrame = GlobalReAllocPtr(this->lpFrame,lpbiU->biSize +
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lpbiU->biSizeImage +
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lpbiU->biClrUsed * sizeof(RGBQUAD), GMEM_MOVEABLE);
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if (this->lpFrame == NULL) {
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DPF("GetFrameInit: Can't resize frame buffer!\n");
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goto error;
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}
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lpbiU = (LPBITMAPINFOHEADER)this->lpFrame;
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this->lpBits = (LPBYTE)lpbiU + (int)lpbiU->biSize +
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(int)lpbiU->biClrUsed * sizeof(RGBQUAD);
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}
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//
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// use ICDecompressEx if we need to. we need DecompressEx if
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// we are decompressing into a smaller area of the DIB, not the
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// whole surface.
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//
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if (dx == -1)
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dx = (int)lpbiU->biWidth;
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if (dy == -1)
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dy = (int)lpbiU->biHeight;
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this->fDecompressEx = (x != 0 || y != 0 ||
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dy != (int)lpbiU->biHeight || dx != (int)lpbiU->biWidth);
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if (this->fDecompressEx) {
|
||
|
|
|
||
|
|
this->x = x;
|
||
|
|
this->y = y;
|
||
|
|
this->dx = dx;
|
||
|
|
this->dy = dy;
|
||
|
|
|
||
|
|
dw = ICDecompressExBegin(this->hic, 0,
|
||
|
|
lpbiC, NULL, 0, 0, lpbiC->biWidth, lpbiC->biHeight,
|
||
|
|
lpbiU, NULL, x, y, dx, dy);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
dw = ICDecompressBegin(this->hic,lpbiC,lpbiU);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dw != ICERR_OK) {
|
||
|
|
DPF("GetFrameSetFormat: ICDecompressBegin failed!\n");
|
||
|
|
goto error;
|
||
|
|
}
|
||
|
|
|
||
|
|
done:
|
||
|
|
this->lFrame = -4224; // bogus value
|
||
|
|
return AVIERR_OK;
|
||
|
|
|
||
|
|
error:
|
||
|
|
FreeStuff();
|
||
|
|
return ERR_FAIL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
STDMETHODIMP GetFrameDef::Begin(LONG lStart, LONG lEnd, LONG lRate)
|
||
|
|
{
|
||
|
|
fBegin = TRUE;
|
||
|
|
GetFrame(lStart);
|
||
|
|
|
||
|
|
return AVIERR_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
STDMETHODIMP GetFrameDef::End()
|
||
|
|
{
|
||
|
|
fBegin = FALSE;
|
||
|
|
return AVIERR_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
***************************************************************************/
|
||
|
|
|
||
|
|
STDMETHODIMP_(LPVOID) GetFrameDef::GetFrame(LONG lPos)
|
||
|
|
{
|
||
|
|
LPBITMAPINFOHEADER lpbiC;
|
||
|
|
LPBITMAPINFOHEADER lpbiU;
|
||
|
|
LONG l;
|
||
|
|
LONG lKey;
|
||
|
|
LONG lBytes;
|
||
|
|
LONG lSize;
|
||
|
|
LONG lRead;
|
||
|
|
LRESULT err;
|
||
|
|
AVISTREAMINFOW info;
|
||
|
|
HRESULT hr;
|
||
|
|
|
||
|
|
if (!this->pavi) {
|
||
|
|
DPF("AVIStreamGetFrame: bad pointer\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (this->lpFormat == NULL) {
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// if we are not in a Begin/End pair check for the format changing etc.
|
||
|
|
//
|
||
|
|
if (!this->fBegin) {
|
||
|
|
|
||
|
|
_fmemset(&info, 0, sizeof(info));
|
||
|
|
this->pavi->Info(&info, sizeof(info));
|
||
|
|
|
||
|
|
if (info.dwFormatChangeCount != dwFormatChangeCount) {
|
||
|
|
|
||
|
|
DPF("AVIStreamGetFrame: format has changed\n");
|
||
|
|
|
||
|
|
if (this->lpFrame) {
|
||
|
|
BITMAPINFOHEADER bi = *((LPBITMAPINFOHEADER)this->lpFrame);
|
||
|
|
|
||
|
|
FreeStuff(); // nuke it all.
|
||
|
|
|
||
|
|
if (SetFormat(&bi, NULL, 0, 0, -1, -1) != 0 &&
|
||
|
|
SetFormat(NULL, NULL, 0, 0, -1, -1) != 0)
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
} else {
|
||
|
|
if (SetFormat(NULL, NULL, 0, 0, -1, -1) != 0) {
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (info.dwEditCount != dwEditCount) {
|
||
|
|
DPF("AVIStreamGetFrame: stream has been edited (%lu)\n", info.dwEditCount);
|
||
|
|
dwEditCount = info.dwEditCount;
|
||
|
|
this->lFrame = -4224; // Invalidate the cached frame
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// quick check for the last frame.
|
||
|
|
//
|
||
|
|
if (this->lFrame == lPos)
|
||
|
|
return this->hic ? this->lpFrame : this->lpFormat;
|
||
|
|
|
||
|
|
//
|
||
|
|
// locate the nearest key frame.
|
||
|
|
//
|
||
|
|
lKey = AVIStreamFindSample(this->pavi, lPos, FIND_KEY|FIND_PREV);
|
||
|
|
|
||
|
|
//
|
||
|
|
// either lPos was out of range or some internal error!
|
||
|
|
//
|
||
|
|
if (lKey == -1) {
|
||
|
|
DPF("AVIStreamGetFrame: Couldn't find key frame!\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// we need to go back to the specifed key frame
|
||
|
|
// or our current frame witch ever is closer
|
||
|
|
//
|
||
|
|
if (this->lFrame < lPos && this->lFrame >= lKey)
|
||
|
|
lKey = this->lFrame + 1;
|
||
|
|
|
||
|
|
lpbiC = (LPBITMAPINFOHEADER)this->lpFormat;
|
||
|
|
lpbiU = (LPBITMAPINFOHEADER)this->lpFrame;
|
||
|
|
|
||
|
|
//
|
||
|
|
// decompress frame data from key frame to current frame.
|
||
|
|
//
|
||
|
|
for (l=lKey; l<=lPos; l++) {
|
||
|
|
|
||
|
|
//
|
||
|
|
// go read the format and call ICDecompressGetPalette() so
|
||
|
|
// if the palette changes things will work.
|
||
|
|
//
|
||
|
|
if (this->fFmtChanges) {
|
||
|
|
|
||
|
|
AVIStreamReadFormat(this->pavi, l, lpbiC, &this->cbFormat);
|
||
|
|
|
||
|
|
if (lpbiU && lpbiU->biBitCount <= 8) {
|
||
|
|
ICDecompressGetPalette(this->hic,lpbiC,lpbiU);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
try_read_again:
|
||
|
|
hr = AVIStreamRead(this->pavi, l, 1,
|
||
|
|
this->lpBuffer, this->cbBuffer, &lBytes, &lRead);
|
||
|
|
|
||
|
|
//
|
||
|
|
// the read failed, mabey our buffer was too small
|
||
|
|
// or it was a real error.
|
||
|
|
//
|
||
|
|
if (hr != NOERROR) {
|
||
|
|
|
||
|
|
DPF("AVIStreamGetFrame: AVIStreamRead returns %lx\n", (DWORD) hr);
|
||
|
|
|
||
|
|
lSize = 0;
|
||
|
|
hr = AVIStreamSampleSize(this->pavi, l, &lSize);
|
||
|
|
|
||
|
|
if (lSize > this->cbBuffer) {
|
||
|
|
LPVOID lp;
|
||
|
|
|
||
|
|
DPF("AVIStreamGetFrame: re-sizing read buffer from %ld to %ld\n", this->cbBuffer, lSize);
|
||
|
|
|
||
|
|
lp = GlobalReAllocPtr(this->lpFormat,this->cbFormat+lSize,0);
|
||
|
|
|
||
|
|
if (lp == NULL) {
|
||
|
|
DPF("AVIStreamGetFrame: Couldn't resize buffer\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
this->lpFormat = lp;
|
||
|
|
lpbiC = (LPBITMAPINFOHEADER)this->lpFormat;
|
||
|
|
this->lpBuffer = (LPBYTE)lp + this->cbFormat;
|
||
|
|
this->cbBuffer = lSize;
|
||
|
|
|
||
|
|
goto try_read_again;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (lRead != 1) {
|
||
|
|
DPF("AVIStreamGetFrame: AVIStreamRead failed!\n");
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (lBytes == 0)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
lpbiC->biSizeImage = lBytes;
|
||
|
|
|
||
|
|
if (this->hic == NULL) {
|
||
|
|
this->lFrame = lPos;
|
||
|
|
return this->lpFormat;
|
||
|
|
}
|
||
|
|
else if (this->fDecompressEx) {
|
||
|
|
err = ICDecompressEx(this->hic,0,
|
||
|
|
lpbiC,this->lpBuffer,
|
||
|
|
0,0,(int)lpbiC->biWidth,(int)lpbiC->biHeight,
|
||
|
|
lpbiU,this->lpBits,
|
||
|
|
this->x,this->y,this->dx,this->dy);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
err = ICDecompress(this->hic,0,
|
||
|
|
lpbiC,this->lpBuffer,lpbiU,this->lpBits);
|
||
|
|
}
|
||
|
|
|
||
|
|
// !!! Error check?
|
||
|
|
|
||
|
|
if (err < 0) {
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this->lFrame = lPos;
|
||
|
|
return this->hic ? this->lpFrame : this->lpFormat;
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************
|
||
|
|
* @doc EXTERNAL AVIStreamGetFrameOpen
|
||
|
|
*
|
||
|
|
* @api PGETFRAME | AVIStreamGetFrameOpen | This functions prepares
|
||
|
|
* to decompress video frames from the stream specified.
|
||
|
|
*
|
||
|
|
* @parm PAVISTREAM | pavi | Specifies a pointer to the
|
||
|
|
* stream used as the video source.
|
||
|
|
*
|
||
|
|
* @parm LPBITMAPINFOHEADER | lpbiWanted | Specifies a pointer to
|
||
|
|
* a structure defining the desired video format. If this is NULL,
|
||
|
|
* a default format is used.
|
||
|
|
*
|
||
|
|
* @rdesc Returns a GetFrame object, which can be used with
|
||
|
|
* <f AVIStreamGetFrame>.
|
||
|
|
*
|
||
|
|
* If the system can't find decompressor that can decompress the stream
|
||
|
|
* to the format given, or to any RGB format, the function returns NULL.
|
||
|
|
*
|
||
|
|
* @comm The <p pavi> parameter must specify a video stream.
|
||
|
|
*
|
||
|
|
* This is essentially just a helper function to handle a simple form
|
||
|
|
* of decompression.
|
||
|
|
*
|
||
|
|
* @xref <f AVIStreamGetFrame> <f AVIStreamGetFrameClose>
|
||
|
|
**********************************************************************/
|
||
|
|
STDAPI_(PGETFRAME) AVIStreamGetFrameOpen(PAVISTREAM pavi, LPBITMAPINFOHEADER lpbiWanted)
|
||
|
|
{
|
||
|
|
PGETFRAME pgf=NULL;
|
||
|
|
|
||
|
|
//
|
||
|
|
// first ask the IAVIStream object if it can handle IGetFrame and
|
||
|
|
// if it can let it do it.
|
||
|
|
//
|
||
|
|
pavi->QueryInterface(IID_IGetFrame, (LPVOID FAR *)&pgf);
|
||
|
|
|
||
|
|
if (pgf == NULL) {
|
||
|
|
//
|
||
|
|
// the stream can't do it, make our own object.
|
||
|
|
//
|
||
|
|
pgf = new GetFrameDef(pavi);
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// set the format the caller wants
|
||
|
|
//
|
||
|
|
if (pgf->SetFormat(lpbiWanted, NULL, 0, 0, -1, -1)) {
|
||
|
|
DPF("AVIStreamGetFrameOpen: unable to set format\n");
|
||
|
|
pgf->Release();
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return pgf;
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************
|
||
|
|
* @doc EXTERNAL AVIStreamGetFrameClose
|
||
|
|
*
|
||
|
|
* @api LONG | AVIStreamGetFrameClose | This function releases resources
|
||
|
|
* used to decompress video frames.
|
||
|
|
*
|
||
|
|
* @parm PGETFRAME | pget | Specifies a handle returned from <f AVIStreamGetFrameOpen>.
|
||
|
|
* After calling this function, the handle is invalid.
|
||
|
|
*
|
||
|
|
* @rdesc Returns an error code.
|
||
|
|
*
|
||
|
|
* @xref <f AVIStreamGetFrameOpen> <f AVIStreamGetFrame>
|
||
|
|
**********************************************************************/
|
||
|
|
STDAPI AVIStreamGetFrameClose(PGETFRAME pgf)
|
||
|
|
{
|
||
|
|
if (pgf)
|
||
|
|
pgf->Release();
|
||
|
|
|
||
|
|
return AVIERR_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/********************************************************************
|
||
|
|
* @doc EXTERNAL AVIStreamGetFrame
|
||
|
|
*
|
||
|
|
* @api LPVOID | AVIStreamGetFrame | This function returns a pointer to
|
||
|
|
* a decompressed frame of video.
|
||
|
|
*
|
||
|
|
* @parm PGETFRAME | pgf | Specifies a pointer to a GetFrame object.
|
||
|
|
*
|
||
|
|
* @parm LONG | lPos | Specifies the position of desired frame in samples.
|
||
|
|
*
|
||
|
|
* @rdesc Returns NULL on error; otherwise it returns a far pointer
|
||
|
|
* to the frame data. The returned data is a packed DIB.
|
||
|
|
*
|
||
|
|
* @comm The returned frame is valid only until the next call
|
||
|
|
* to <f AVIStreamGetFrame> or <f AVIStreamGetFrameClose>.
|
||
|
|
*
|
||
|
|
* @xref <f AVIStreamGetFrameOpen>
|
||
|
|
**********************************************************************/
|
||
|
|
STDAPI_(LPVOID) AVIStreamGetFrame(PGETFRAME pgf, LONG lPos)
|
||
|
|
{
|
||
|
|
if (pgf == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return pgf->GetFrame(lPos);
|
||
|
|
}
|
||
|
|
|
||
|
|
// !!! Do we need an AVIStreamGetFrameSetFormat?
|