/// <summary>
/// Create new AVI file and open it for writing.
/// </summary>
///
/// <param name="fileName">AVI file name to create.</param>
/// <param name="width">Video width.</param>
/// <param name="height">Video height.</param>
///
/// <remarks><para>The method opens (creates) a video files, configure video codec and prepares
/// the stream for saving video frames with a help of <see cref="AddFrame"/> method.</para></remarks>
///
/// <exception cref="System.IO.IOException">Failed opening the specified file.</exception>
/// <exception cref="VideoException">A error occurred while creating new video file. See exception message.</exception>
/// <exception cref="OutOfMemoryException">Insufficient memory for internal buffer.</exception>
/// <exception cref="ArgumentException">Video file resolution must be a multiple of two.</exception>
///
public void Open(string fileName, int width, int height)
{
// close previous file
Close( );
// check width and height
if (((width & 1) != 0) || ((height & 1) != 0))
{
throw new ArgumentException("Video file resolution must be a multiple of two.");
}
bool success = false;
try
{
lock ( sync )
{
// calculate stride
stride = width * 3;
if ((stride % 4) != 0)
{
stride += (4 - stride % 4);
}
// create new file
if (Win32.AVIFileOpen(out file, fileName, Win32.OpenFileMode.Create | Win32.OpenFileMode.Write, IntPtr.Zero) != 0)
{
throw new System.IO.IOException("Failed opening the specified file.");
}
this.width = width;
this.height = height;
// describe new stream
Win32.AVISTREAMINFO info = new Win32.AVISTREAMINFO( );
info.type = Win32.mmioFOURCC("vids");
info.handler = Win32.mmioFOURCC(codec);
info.scale = 1;
info.rate = rate;
info.suggestedBufferSize = stride * height;
// create stream
if (Win32.AVIFileCreateStream(file, out stream, ref info) != 0)
{
throw new VideoException("Failed creating stream.");
}
// describe compression options
Win32.AVICOMPRESSOPTIONS options = new Win32.AVICOMPRESSOPTIONS( );
options.handler = Win32.mmioFOURCC(codec);
options.quality = quality;
// uncomment if video settings dialog is required to show
// Win32.AVISaveOptions( stream, ref options );
// create compressed stream
if (Win32.AVIMakeCompressedStream(out streamCompressed, stream, ref options, IntPtr.Zero) != 0)
{
throw new VideoException("Failed creating compressed stream.");
}
// describe frame format
Win32.BITMAPINFOHEADER bitmapInfoHeader = new Win32.BITMAPINFOHEADER( );
bitmapInfoHeader.size = Marshal.SizeOf(bitmapInfoHeader.GetType( ));
bitmapInfoHeader.width = width;
bitmapInfoHeader.height = height;
bitmapInfoHeader.planes = 1;
bitmapInfoHeader.bitCount = 24;
bitmapInfoHeader.sizeImage = 0;
bitmapInfoHeader.compression = 0; // BI_RGB
// set frame format
if (Win32.AVIStreamSetFormat(streamCompressed, 0, ref bitmapInfoHeader, Marshal.SizeOf(bitmapInfoHeader.GetType( ))) != 0)
{
throw new VideoException("Failed setting format of the compressed stream.");
}
// alloc unmanaged memory for frame
buffer = Marshal.AllocHGlobal(stride * height);
if (buffer == IntPtr.Zero)
{
throw new OutOfMemoryException("Insufficient memory for internal buffer.");
}
position = 0;
success = true;
}
}
finally
{
if (!success)
{
Close( );
}
}
}
/// <summary>
/// Open AVI file.
/// </summary>
///
/// <param name="fileName">AVI file name to open.</param>
///
/// <remarks><para>The method opens a video file and prepares the stream and decoder for
/// reading video frames with the help of <see cref="GetNextFrame"/> method.</para>
/// </remarks>
///
/// <exception cref="System.IO.IOException">Failed opening the specified file.</exception>
/// <exception cref="VideoException">A error occurred while opening the video file. See exception message.</exception>
///
///
public void Open(string fileName)
{
// close previous file
Close( );
bool success = false;
try
{
lock ( sync )
{
// open AVI file
if (Win32.AVIFileOpen(out file, fileName, Win32.OpenFileMode.ShareDenyWrite, IntPtr.Zero) != 0)
{
throw new System.IO.IOException("Failed opening the specified AVI file.");
}
// get first video stream
if (Win32.AVIFileGetStream(file, out stream, Win32.mmioFOURCC("vids"), 0) != 0)
{
throw new VideoException("Failed getting video stream.");
}
// get stream info
Win32.AVISTREAMINFO info = new Win32.AVISTREAMINFO( );
Win32.AVIStreamInfo(stream, ref info, Marshal.SizeOf(info));
width = info.rectFrame.right;
height = info.rectFrame.bottom;
position = info.start;
start = info.start;
length = info.length;
rate = (float)info.rate / (float)info.scale;
codec = Win32.decode_mmioFOURCC(info.handler);
// prepare decompressor
Win32.BITMAPINFOHEADER bitmapInfoHeader = new Win32.BITMAPINFOHEADER( );
bitmapInfoHeader.size = Marshal.SizeOf(bitmapInfoHeader.GetType( ));
bitmapInfoHeader.width = width;
bitmapInfoHeader.height = height;
bitmapInfoHeader.planes = 1;
bitmapInfoHeader.bitCount = 24;
bitmapInfoHeader.compression = 0; // BI_RGB
// get frame object
if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bitmapInfoHeader)) == IntPtr.Zero)
{
bitmapInfoHeader.height = -height;
if ((getFrame = Win32.AVIStreamGetFrameOpen(stream, ref bitmapInfoHeader)) == IntPtr.Zero)
{
throw new VideoException("Failed initializing decompressor.");
}
}
success = true;
}
}
finally
{
if (!success)
{
Close( );
}
}
}