(curse words) AVI (curse words)

[Sastraxi]

#include <windows.h>
#include <vfw.h>
#include <string>
#include <fstream>
#include <iomanip>

using namespace std;

class Video {

	public:
		Video(string path, HDC hdc, int nw);
		~Video();
		void showFrame(long frame);
		
	private:
		PAVIFILE aviFile;
		PAVISTREAM aviStream;
		AVISTREAMINFO aviStreamInfo;
 		BITMAPINFOHEADER bmih;	
 		LPBITMAPINFOHEADER lpbi;
 		PGETFRAME pgf;
		unsigned char* pdata;
		HDRAWDIB hdd;
		HDC drawdc;
		int width, height, newwidth, newheight;
		double fps, duration;
		int length;
		
};

Video::Video(string path, HDC hdc, int nw) {

	ofstream fout("video.log");

	// initialise the AVI file library
	// and open the video file/stream
	AVIFileInit();
	AVIFileOpenA(&aviFile, path.c_str(), OF_READ, NULL);	
	AVIFileGetStream(aviFile, &aviStream, streamtypeVIDEO, 0);
	AVIStreamInfo(aviStream, &aviStreamInfo, sizeof(aviStreamInfo));

	// get video stream data
	width = aviStreamInfo.rcFrame.right - aviStreamInfo.rcFrame.left;
	height = aviStreamInfo.rcFrame.bottom - aviStreamInfo.rcFrame.top;
	DWORD aa = aviStreamInfo.fccHandler;
	fps = double(aviStreamInfo.dwRate) / double(aviStreamInfo.dwScale);
	length = aviStreamInfo.dwLength;
	duration = double(length) / fps;

	// figure out the destination width/height
	newwidth = nw;
	newheight = int(nw * double(height / double(width)));

	// set up the destination bitmap
	bmih.biSize	= sizeof(BITMAPINFOHEADER);
	bmih.biPlanes = 1;
	bmih.biBitCount	= 24;					
	bmih.biWidth = newwidth;
	bmih.biHeight = newheight;
	bmih.biCompression = BI_RGB;				

	// debug
	fout << "stream size: " << width << "x" << height << endl;
	fout << "dest. size: " << newwidth << "x" << newheight << endl;
	fout << "fourcc: " << (char)(aa & 0xff) << endl;	
	fout << "framerate: " << setprecision(3) << fps << endl;
	fout << "length: " << setprecision(3) << fixed
		<< duration << "s (" << length << " frames)" << endl;

	// open the stream for reading
	pgf = AVIStreamGetFrameOpen(aviStream, NULL);

	// create the bitmap and attach it to the dc
	//data = 0;
	//cdc = CreateCompatibleDC(0);
	//hBitmap = CreateDIBSection(cdc, (BITMAPINFO*)(&bmih), DIB_RGB_COLORS,
	//	(void**)(&data), NULL, 0);
	//hOld = (HBITMAP)SelectObject(cdc, hBitmap); 
	
	// create the "drawdib" and store the DC	
	hdd = DrawDibOpen();
	drawdc = hdc;
	
}

Video::~Video() {

	DrawDibClose(hdd);
//	SelectObject(drawdc, hOld);
//	DeleteObject(hBitmap);

	AVIStreamGetFrameClose(pgf);	
	AVIFileRelease(aviFile);
	AVIFileExit();	

}

void Video::showFrame(long frame) {

	lpbi = (LPBITMAPINFOHEADER)AVIStreamGetFrame(pgf, frame);
	pdata = (unsigned char*) lpbi + sizeof(BITMAPINFOHEADER);
	DrawDibDraw(hdd, drawdc, 0, 0, newwidth, newheight, 
		lpbi, pdata, 0, 0, width, height, 0);
	//BitBlt(drawdc, 0, 0, newwidth, newheight, cdc, 0, 0, SRCCOPY);

}

Any thoughts on why using this class just refuses to blit anything?
You use it like:

Video a("my.avi", hDC, 500) // 500 is the width of the image
a.showFrame(50);

[Jacob Roman]

It seems that height may be needed as one of the new arguements in your sub named Video. You only have width in there. Don't know why though.

[Sastraxi]

Aspect Ratio reasons.
I'm conisdering monetary payments for someone that can actually show me a working C++ class to load and display AVI files. It doesn't seem like such a stretch that someone out there has done this before.

I'm at the end of my tether.

[NoteMe]

Are we allowed to use DShow (grrrr...I can't even find the question mark on this keyboard...grrrrr)....





"Sincerely the guy that is apparently stuck in the wrong country"

[cyborg]

Shouldn't bmih.biSizeImage be filled out too?

[Venom555]

I'm not sure if this is any help to you, but there is an AVI tutorial on nehe.gamedev.net, but in OpenGL...

http://nehe.gamedev.net/data/lessons....asp?lesson=35

You might be able to get what you need from that tutorial.

[cyborg]

Btw, did you look at the link I gave you on the other avi thread?
Those examples works perfect in VB. I've made a couple of video editing programs based on those examples. Don't think it would be too hard to port into C++.

[Halsafar]

Sounds like a challenge.
If you can seriously run AVI's via BitBlt I can probably have that done for you in no time. I do on the other hand have ZERO experience with parsing AVI Files. So are all those AVI___ functions you are using Win32 API or from a 3rd party library?

[Sastraxi]

They're from the API.
I don't think the real problem is the AVI loading but what I'm doing with the data.
I'm going to try for a few more hours and then go insane over something that should have taken one.

[Sastraxi]

Actually, about 20 minutes after I posted last, I figured everything out. I had been passing in "NULL" for a value instead of the needed BitmapInfoHeader. What a wonderful waste of time.

If anyone's interested in the code, I'll post'er up as a C++ class.

[cyborg]

Is it faster to BitBlt the image to a Picturebox, or is it faster to use SetDIBbits?
Cuz I got a working program using SetDIBbits, and if BitBlt is slower, I wont be needing that code...

[Sastraxi]

There's simply no way to use Bitblt in this case, so I would hope it would be faster...

avi.hpp

#ifndef __AVI_HPP__
#define __AVI_HPP__

#include <windows.h>
#include <vfw.h>
#include <string>
#include <fstream>
#include <iomanip>

using namespace std;

class Video {

	public:
		Video(string path, HDC hdc, int nw);
		~Video();
		bool showFrame(long frame);
		bool delayFrame();
		
	private:
		PAVIFILE aviFile;
		PAVISTREAM aviStream;
		AVISTREAMINFO aviStreamInfo;
 		BITMAPINFOHEADER bmih;	
 		PGETFRAME pgf;
 		HBITMAP hBitmap, hOld;
		unsigned char* pdata, data;
		HDRAWDIB hdd;
		HDC drawdc, cdc;
		int width, height, newwidth, newheight;
		double fps, duration, sttime;
		int length, framedir;
		LPBITMAPINFOHEADER lpbi;
			
		
};

Video::Video(string path, HDC hdc, int nw) {

	// initialise the AVI file library
	// and open the video file/stream
	AVIFileInit();
	AVIFileOpenA(&aviFile, path.c_str(), OF_READ, NULL);	
	AVIFileGetStream(aviFile, &aviStream, streamtypeVIDEO, 0);
	AVIStreamInfo(aviStream, &aviStreamInfo, sizeof(aviStreamInfo));

	// get video stream data
	width = aviStreamInfo.rcFrame.right - aviStreamInfo.rcFrame.left;
	height = aviStreamInfo.rcFrame.bottom - aviStreamInfo.rcFrame.top;
	DWORD* aa = &aviStreamInfo.fccHandler;
	fps = double(aviStreamInfo.dwRate) / double(aviStreamInfo.dwScale);
	length = aviStreamInfo.dwLength;
	duration = double(length) / fps;
	framedir = (int)(1000.0 / fps);
	drawdc = hdc;

	// figure out the destination width/height
	newwidth = nw;
	newheight = int(nw * double(height / double(width)));

	// set up the destination bitmap
	bmih.biBitCount 		= 24;
	bmih.biClrImportant 	= 0;
	bmih.biClrUsed			= 0;
	bmih.biCompression		= BI_RGB;
	bmih.biWidth 			= width;
	bmih.biHeight 			= height;
	bmih.biPlanes			= 1;
	bmih.biSize				= 40;
	bmih.biXPelsPerMeter	= 0;
	bmih.biXPelsPerMeter	= 0;
	bmih.biSizeImage		= (((bmih.biWidth * 3) + 3) & 0xfffc) * bmih.biHeight;

	// open the stream for reading
	pgf = AVIStreamGetFrameOpen(aviStream, &bmih);
	sttime = -1;
	
}

Video::~Video() {

	AVIStreamGetFrameClose(pgf);	
	AVIFileRelease(aviFile);
	AVIFileExit();	

}

bool Video::delayFrame() {

	if (sttime == -1)
		// start the delay process
		sttime = GetTickCount();		
	else {
		if ((GetTickCount() - sttime) >= framedir) {
			// we've elapsed the time
			sttime = -1;
			return false;
		}
	}
	
	// we want to delay a bit longer
	return true;
	
}

bool Video::showFrame(long frame) {
	
	long ff = AVIStreamStart(aviStream);
	
	// get the frame
	lpbi = (LPBITMAPINFOHEADER)AVIStreamGetFrame(pgf, frame + ff);	
	if ((long)lpbi == 0)
		return false;
	
	// show it
	long pDib = (long)lpbi + 40;
	StretchDIBits(drawdc, 0, 0, newwidth, newheight, 0, 0, width, height,
		(void*)pDib, (BITMAPINFO*)lpbi, DIB_RGB_COLORS, SRCCOPY);

	return true;

}

#endif

[cyborg]

Here's the program I made (VB)... (With some help form shrinkwrapvb.com)
I'm pretty impressed by the speed of this