AVIStreamGetFrameOpen返回null失败

最新推荐文章于 2021-06-04 21:48:20 发布

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本文介绍了一个简单的AVI播放器的实现过程，包括如何打开AVI文件、读取视频流信息、创建帧缓冲区等关键步骤。代码示例展示了如何使用AVIStreamOpenFromFile和AVIStreamGetFrameOpen等API来初始化视频播放。

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AVIStreamGetFrameOpen(pavi, PBITMAPINFOHEADER(AVIGETFRAMEF_BESTDISPLAYFMT));最后一个参数不能设置成NULL，否则可能会失败

void OpenAVI(LPCSTR szFile)										// Opens An AVI File (szFile)
{
	TCHAR	title[100];											// Will Hold The Modified Window Title

	AVIFileInit();												// Opens The AVIFile Library

	// Opens The AVI Stream
	if (AVIStreamOpenFromFile(&pavi, szFile, streamtypeVIDEO, 0, OF_READ, NULL) !=0)
	{
		// An Error Occurred Opening The Stream
		MessageBox (HWND_DESKTOP, "Failed To Open The AVI Stream", "Error", MB_OK | MB_ICONEXCLAMATION);
	}

	AVIStreamInfo(pavi, &psi, sizeof(psi));						// Reads Information About The Stream Into psi
	width=psi.rcFrame.right-psi.rcFrame.left;					// Width Is Right Side Of Frame Minus Left
	height=psi.rcFrame.bottom-psi.rcFrame.top;					// Height Is Bottom Of Frame Minus Top

	lastframe=AVIStreamLength(pavi);							// The Last Frame Of The Stream

	mpf=AVIStreamSampleToTime(pavi,lastframe)/lastframe;		// Calculate Rough Milliseconds Per Frame

	bmih.biSize = sizeof (BITMAPINFOHEADER);					// Size Of The BitmapInfoHeader
	bmih.biPlanes = 1;											// Bitplanes	
	bmih.biBitCount = 24;										// Bits Format We Want (24 Bit, 3 Bytes)
	bmih.biWidth = 256;											// Width We Want (256 Pixels)
	bmih.biHeight = 256;										// Height We Want (256 Pixels)
	bmih.biCompression = BI_RGB;								// Requested Mode = RGB

	hBitmap = CreateDIBSection (hdc, (BITMAPINFO*)(&bmih), DIB_RGB_COLORS, (void**)(&data), NULL, NULL);
	SelectObject (hdc, hBitmap);								// Select hBitmap Into Our Device Context (hdc)

// 
	pgf=AVIStreamGetFrameOpen(pavi, PBITMAPINFOHEADER(AVIGETFRAMEF_BESTDISPLAYFMT));						// Create The PGETFRAME	Using Our Request Mode
	if (pgf==NULL)
	{
		// An Error Occurred Opening The Frame
		MessageBox (HWND_DESKTOP, "Failed To Open The AVI Frame", "Error", MB_OK | MB_ICONEXCLAMATION);
	}

	// Information For The Title Bar (Width / Height / Last Frame)
	wsprintf (title, "NeHe's AVI Player: Width: %d, Height: %d, Frames: %d", width, height, lastframe);
	SetWindowText(g_window->hWnd, title);						// Modify The Title Bar
}