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Webcam: Buffer some frames to avoid garbage accumulation.

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Valeriano A.R.
2018-11-05 00:13:45 +01:00
parent 5b6eab74f0
commit e8a6cfb672
3 changed files with 21 additions and 10 deletions
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2
VAR.Toolbox/Code/DirectShow/ISampleGrabber.cs
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@@ -8,7 +8,7 @@ namespace VAR.Toolbox.Code.DirectShow
/// individual media samples as they move through the filter graph.
/// </summary>
///
[ComImport,
[ComImport,
Guid("6B652FFF-11FE-4FCE-92AD-0266B5D7C78F"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface ISampleGrabber

2
VAR.Toolbox/Code/DirectShow/ISampleGrabberCB.cs
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@@ -7,7 +7,7 @@ namespace VAR.Toolbox.Code.DirectShow
/// The interface provides callback methods for the <see cref="ISampleGrabber.SetCallback"/> method.
/// </summary>
///
[ComImport,
[ComImport,
Guid("0579154A-2B53-4994-B0D0-E773148EFF85"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface ISampleGrabberCB

27
VAR.Toolbox/Code/Webcam.cs
View File

@@ -252,12 +252,6 @@ namespace VAR.Toolbox.Code
public event NewFrameEventHandler NewFrame;
private void OnNewFrame(Bitmap frame)
{
if (NewFrame != null)
NewFrame(this, frame);
}
#endregion NewFrameEvent
#region Grabber
@@ -266,9 +260,26 @@ namespace VAR.Toolbox.Code
{
private Webcam _parent;
private Bitmap[] _frames = null;
private int _numFrames = 10;
private int _currentFrameIndex = -1;
public Grabber(Webcam parent)
{
_parent = parent;
_frames = new Bitmap[_numFrames];
}
private Bitmap GetNextFrame()
{
_currentFrameIndex = (_currentFrameIndex + 1) % _numFrames;
Bitmap currentBitmap = _frames[_currentFrameIndex];
if (currentBitmap == null || currentBitmap?.Width != _parent.width || currentBitmap?.Height != _parent.height)
{
currentBitmap = new Bitmap(_parent.width, _parent.height, PixelFormat.Format24bppRgb);
_frames[_currentFrameIndex] = currentBitmap;
}
return currentBitmap;
}
public int SampleCB(double sampleTime, IntPtr sample)
@@ -281,7 +292,7 @@ namespace VAR.Toolbox.Code
if (_parent.NewFrame != null)
{
// create new image
Bitmap _image = new Bitmap(_parent.width, _parent.height, PixelFormat.Format24bppRgb);
Bitmap _image = GetNextFrame();
Rectangle _imageRect = new Rectangle(0, 0, _parent.width, _parent.height);
// lock bitmap data
@@ -311,7 +322,7 @@ namespace VAR.Toolbox.Code
_image.UnlockBits(imageData);
// notify parent
_parent.OnNewFrame(_image);
_parent.NewFrame?.Invoke(this, _image);
}
return 0;