Cisco's openh264 wrapper library for .NET Framework.
Written in C++/CLI to bridge other .NET Framework language like C#.
// create encoder and decoder
var encoder = new OpenH264Lib.Encoder("openh264-2.1.1-win32.dll");
var decoder = new OpenH264Lib.Decoder("openh264-2.1.1-win32.dll");
// setup encoder
float fps = 10.0f;
int bps = 5000 * 1000; // target bitrate. 5Mbps.
float keyFrameInterval = 2.0f; // insert key frame interval. unit is second.
encoder.Setup(640, 480, bps, fps, keyFrameInterval, (data, length, frameType) =>
{
// called when each frame encoded.
Console.WriteLine("Encord {0} bytes, frameType:{1}", length, frameType);
// decode it to Bitmap again...
var bmp = decoder.Decode(data, length);
if (bmp != null) Console.WriteLine(bmp.Size);
});
// encode frame
foreach(var bmp in bitmaps)
{
encoder.Encode(bmp);
}- Open 'OpenH264Lib.sln' Visual Studio solution file.
- Build OpenH264Lib project from VisualStudio 'Build OpenH264Lib' menu. (Not 'Build Solution'), or in Solution Explorer, right click 'OpenH264Lib' project and build. Then created OpenH264Lib.dll.
- Build OpenH264Sample project from VisualStudio 'Build Solution' menu, or in Solution Explorer, right click 'OpenH264Sample' project and build. This is example C# project how to use OpenH264Lib.dll.
- Download 'openh264-2.1.1-win32.dll' from Cisco's openh264 Github repository,
and copy it to OpenH264Sample/bin/Debug/ directory.
- If you are going to use 'openh264-x.x.x-win64.dll', build dll and exe as x64 pratform in step (2) and (3).
- Use Cisco's dll version 2.1.0 and later. (issue #19). If you are going to use dll version 2.0.0 and before, use old repository.
- Execute OpenH264Sample.exe. This program encode image files to H264 avi file, and decode avi to image.
Since this is only a wrapper library, you have to know about original openh264 implementation when you add/modify features.
You can make H264 video recorder by using OpenH264Lib.NET and UsbCamera and AviWriter(in MotionJPEGWriter).
int index = 0;
var camera = new Github.secile.Video.UsbCamera(index, new Size(640, 480));
camera.Start();
// create H264 encorder.
var path = System.Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + @"\test.avi";
var encoder = new OpenH264Lib.Encoder("openh264-2.1.1-win32.dll");
// write avi for every frame encorded.
var fps = 10.0f;
var writer = new Github.secile.Avi.AviWriter(System.IO.File.OpenWrite(path), "H264", camera.Size.Width, camera.Size.Height, fps);
OpenH264Lib.Encoder.OnEncodeCallback onEncode = (data, length, frameType) =>
{
var keyFrame = (frameType == OpenH264Lib.Encoder.FrameType.IDR) || (frameType == OpenH264Lib.Encoder.FrameType.I);
writer.AddImage(data, keyFrame);
Console.WriteLine("Encord {0} bytes, KeyFrame:{1}", length, keyFrame);
};
// setup encorder.
int bps = 100000; // 100kbps
encoder.Setup(camera.Size.Width, camera.Size.Height, bps, fps, 2.0f, onEncode);
// encode image for every captured image.
var timer = new System.Timers.Timer(1000 / fps) { SynchronizingObject = this };
timer.Elapsed += (s, ev) =>
{
var bmp = camera.GetBitmap();
pbxImage.Image = bmp;
encoder.Encode(bmp);
};
timer.Start();
// release resource when close.
this.FormClosing += (s, ev) =>
{
camera.Release();
timer.Stop();
writer.Close();
encoder.Dispose();
};
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