/// <summary>Initialize a VideoStream for an existing stream</summary>
/// <param name="aviFile">The file that contains the stream</param>
/// <param name="aviStream">An IAVISTREAM from [aviFile]</param>
public VideoStream(int aviFile, IntPtr aviStream)
{
this.aviFile = aviFile;
this.aviStream = aviStream;
Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream);
//Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER();
//int size = Marshal.SizeOf(bih);
Avi.BITMAPINFO bih = new Avi.BITMAPINFO();
int size = Marshal.SizeOf(bih.bmiHeader);
Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size);
if (bih.bmiHeader.biBitCount < 24)
{
size = Marshal.SizeOf(bih.bmiHeader) + Avi.PALETTE_SIZE;
Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size);
CopyPalette(bih.bmiColors);
}
this.frameRate = (float)streamInfo.dwRate / (float)streamInfo.dwScale;
this.width = (int)streamInfo.rcFrame.right;
this.height = (int)streamInfo.rcFrame.bottom;
this.frameSize = bih.bmiHeader.biSizeImage;
this.countBitsPerPixel = bih.bmiHeader.biBitCount;
this.firstFrame = Avi.AVIStreamStart(aviStream.ToInt32());
this.countFrames = Avi.AVIStreamLength(aviStream.ToInt32());
}
/*
* /// <summary>Export a frame into a bitmap</summary>
* /// <param name="position">Position of the frame</param>
* public Bitmap GetBitmap(int position){
* if(position > countFrames){
* throw new Exception("Invalid frame position: "+position);
* }
*
* Avi.AVISTREAMINFO streamInfo = GetStreamInfo(StreamPointer);
*
* //Decompress the frame and return a pointer to the DIB
* int dib = Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position);
* //Copy the bitmap header into a managed struct
* Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER();
* bih = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(new IntPtr(dib), bih.GetType());
*
* if(bih.biSizeImage < 1){
* throw new Exception("Exception in VideoStreamGetFrame");
* }
*
* //copy the image
*
* byte[] bitmapData;
* int address = dib + Marshal.SizeOf(bih);
* if(bih.biBitCount < 16){
* //copy palette and pixels
* bitmapData = new byte[bih.biSizeImage + Avi.PALETTE_SIZE];
* }else{
* //copy only pixels
* bitmapData = new byte[bih.biSizeImage];
* }
*
* Marshal.Copy(new IntPtr(address), bitmapData, 0, bitmapData.Length);
*
* //copy bitmap info
* byte[] bitmapInfo = new byte[Marshal.SizeOf(bih)];
* IntPtr ptr;
* ptr = Marshal.AllocHGlobal(bitmapInfo.Length);
* Marshal.StructureToPtr(bih, ptr, false);
* address = ptr.ToInt32();
* Marshal.Copy(new IntPtr(address), bitmapInfo, 0, bitmapInfo.Length);
*
* Marshal.FreeHGlobal(ptr);
*
* //create file header
* Avi.BITMAPFILEHEADER bfh = new Avi.BITMAPFILEHEADER();
* bfh.bfType = Avi.BMP_MAGIC_COOKIE;
* bfh.bfSize = (Int32)(55 + bih.biSizeImage); //size of file as written to disk
* bfh.bfReserved1 = 0;
* bfh.bfReserved2 = 0;
* bfh.bfOffBits = Marshal.SizeOf(bih) + Marshal.SizeOf(bfh);
* if(bih.biBitCount < 16){
* //There is a palette between header and pixel data
* bfh.bfOffBits += Avi.PALETTE_SIZE;
* }
*
* //write a bitmap stream
* BinaryWriter bw = new BinaryWriter( new MemoryStream() );
*
* //write header
* bw.Write(bfh.bfType);
* bw.Write(bfh.bfSize);
* bw.Write(bfh.bfReserved1);
* bw.Write(bfh.bfReserved2);
* bw.Write(bfh.bfOffBits);
* //write bitmap info
* bw.Write(bitmapInfo);
* //write bitmap data
* bw.Write(bitmapData);
*
* Bitmap bmp = (Bitmap)Image.FromStream(bw.BaseStream);
* Bitmap saveableBitmap = new Bitmap(bmp.Width, bmp.Height);
* Graphics g = Graphics.FromImage(saveableBitmap);
* g.DrawImage(bmp, 0,0);
* g.Dispose();
* bmp.Dispose();
*
* bw.Close();
* return saveableBitmap;
* }*/
public Bitmap GetBitmap(int position)
{
if (position > countFrames)
{
throw new Exception("Invalid frame position: " + position);
}
Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream);
// Get the pointer to the BITMAPINFOHEADER
int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32());
IntPtr bitmapPtr = new IntPtr(Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position));
// Copy into a BITMAPINFOHEADER structure
Avi.BITMAPINFOHEADER bitmapInfo = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(bitmapPtr, typeof(Avi.BITMAPINFOHEADER));
// Find the offset of the raw image data
IntPtr imagePtr = new IntPtr(bitmapPtr.ToInt32() + bitmapInfo.biSize);
// Determine the stride
int stride = bitmapInfo.biSizeImage / bitmapInfo.biHeight;
// Determine the pixel format
PixelFormat pixelFormat = ConvertBitCountToPixelFormat(bitmapInfo.biBitCount);
// Create a bitmap from the raw image data
Bitmap bmp = new Bitmap(bitmapInfo.biWidth, bitmapInfo.biHeight, stride, pixelFormat, imagePtr);
// Flip the bitmap vertically
bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
return(bmp);
}
/// <summary>Initialize a VideoStream for an existing stream</summary>
/// <param name="aviFile">The file that contains the stream</param>
/// <param name="aviStream">An IAVISTREAM from [aviFile]</param>
public VideoStream(int aviFile, IntPtr aviStream)
{
base.aviFile = aviFile;
base.aviStream = aviStream;
Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER();
int size = Marshal.SizeOf(bih);
Avi.AVIStreamReadFormat(aviStream, 0, ref bih, ref size);
Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream);
frameRate = streamInfo.dwRate / streamInfo.dwScale;
width = (int)streamInfo.rcFrame.right;
height = (int)streamInfo.rcFrame.bottom;
frameSize = bih.biSizeImage;
countBitsPerPixel = bih.biBitCount;
int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32());
countFrames = firstFrame + Avi.AVIStreamLength(aviStream.ToInt32());
}
/// <summary>Export a frame into a bitmap</summary>
/// <param name="position">Position of the frame</param>
public Bitmap GetBitmap(int position)
{
if (position > countFrames)
{
throw new Exception("Invalid frame position: " + position);
}
Avi.AVISTREAMINFO streamInfo = GetStreamInfo(aviStream);
//Decompress the frame and return a pointer to the DIB
int firstFrame = Avi.AVIStreamStart(aviStream.ToInt32());
int dib = Avi.AVIStreamGetFrame(getFrameObject, firstFrame + position);
IntPtr ptrDib = new IntPtr(dib);
//Copy the bitmap header into a managed struct
Avi.BITMAPINFOHEADER bih = new Avi.BITMAPINFOHEADER();
bih = (Avi.BITMAPINFOHEADER)Marshal.PtrToStructure(ptrDib, bih.GetType());
//Copy bitmap info header into managed bytes
byte[] bitmapInfo = new byte[Marshal.SizeOf(bih)];
Marshal.Copy(ptrDib, bitmapInfo, 0, bitmapInfo.Length);
if (bih.biSizeImage < 1)
{
throw new Exception("Exception in VideoStreamGetFrame");
}
//copy the image
byte[] bitmapData;
int address = dib + Marshal.SizeOf(bih);
if (bih.biBitCount < 16)
{
//copy palette and pixels
bitmapData = new byte[bih.biSizeImage + Avi.PALETTE_SIZE];
}
else
{
//copy only pixels
bitmapData = new byte[bih.biSizeImage];
}
for (int offset = 0; offset < bitmapData.Length; offset++)
{
bitmapData[offset] = Marshal.ReadByte(new IntPtr(address));
address++;
}
//create file header
Avi.BITMAPFILEHEADER bfh = new Avi.BITMAPFILEHEADER();
bfh.bfType = Avi.BMP_MAGIC_COOKIE;
bfh.bfSize = (Int32)(55 + bih.biSizeImage); //size of file as written to disk
bfh.bfReserved1 = 0;
bfh.bfReserved2 = 0;
bfh.bfOffBits = Marshal.SizeOf(bih) + Marshal.SizeOf(bfh);
if (bih.biBitCount < 16)
{
//There is a palette between header and pixel data
bfh.bfOffBits += Avi.PALETTE_SIZE;
}
//write a bitmap stream
BinaryWriter bw = new BinaryWriter(new MemoryStream());
//write header
bw.Write(bfh.bfType);
bw.Write(bfh.bfSize);
bw.Write(bfh.bfReserved1);
bw.Write(bfh.bfReserved2);
bw.Write(bfh.bfOffBits);
//write bitmap info
bw.Write(bitmapInfo);
//write bitmap data
bw.Write(bitmapData);
Bitmap bmp = (Bitmap)Image.FromStream(bw.BaseStream);
Bitmap saveableBitmap = new Bitmap(bmp.Width, bmp.Height);
Graphics g = Graphics.FromImage(saveableBitmap);
g.DrawImage(bmp, 0, 0);
g.Dispose();
bmp.Dispose();
bw.Close();
return(saveableBitmap);
}