private int EncodeFrame(IntPtr sourcePtr, IntPtr destinationPtr, uint destinationSize, out bool isKeyFrame)
{
var outInfo = outBitmapInfo;
outInfo.ImageSize = destinationSize;
var inInfo = inBitmapInfo;
var flags = framesFromLastKey >= keyFrameRate ? VfwApi.ICCOMPRESS_KEYFRAME : 0;
var result = VfwApi.ICCompress(compressorHandle, flags,
ref outInfo, destinationPtr, ref inInfo, sourcePtr,
out _, out var outFlags, frameIndex,
0, quality, IntPtr.Zero, IntPtr.Zero);
CheckICResult(result);
frameIndex++;
isKeyFrame = (outFlags & VfwApi.AVIIF_KEYFRAME) == VfwApi.AVIIF_KEYFRAME;
if (isKeyFrame)
{
framesFromLastKey = 1;
}
else
{
framesFromLastKey++;
}
return((int)outInfo.ImageSize);
}
/// <summary>Encodes a frame.</summary>
/// <seealso cref="IVideoEncoder.EncodeFrame"/>
public int EncodeFrame(byte[] source, int srcOffset, byte[] destination, int destOffset, out bool isKeyFrame)
{
// TODO: Introduce Width and Height in IVideoRecorder and add Requires to EncodeFrame contract
Contract.Assert(srcOffset + 4 * width * height <= source.Length);
BitmapUtils.FlipVertical(source, srcOffset, sourceBuffer, 0, height, width * 4);
var sourceHandle = GCHandle.Alloc(sourceBuffer, GCHandleType.Pinned);
var encodedHandle = GCHandle.Alloc(destination, GCHandleType.Pinned);
try
{
var outInfo = outBitmapInfo;
outInfo.ImageSize = (uint)destination.Length;
var inInfo = inBitmapInfo;
int outFlags;
int chunkID;
var flags = framesFromLastKey >= keyFrameRate ? VfwApi.ICCOMPRESS_KEYFRAME : 0;
var result = VfwApi.ICCompress(compressorHandle, flags,
ref outInfo, encodedHandle.AddrOfPinnedObject(), ref inInfo, sourceHandle.AddrOfPinnedObject(),
out chunkID, out outFlags, frameIndex,
0, quality, IntPtr.Zero, IntPtr.Zero);
CheckICResult(result);
frameIndex++;
isKeyFrame = (outFlags & VfwApi.AVIIF_KEYFRAME) == VfwApi.AVIIF_KEYFRAME;
if (isKeyFrame)
{
framesFromLastKey = 1;
}
else
{
framesFromLastKey++;
}
return((int)outInfo.ImageSize);
}
finally
{
sourceHandle.Free();
encodedHandle.Free();
}
}
