Hello,
I am using JMF (Java Media Framework) to video stream, and then i am taking a
snap shot of that video stream at every 5 seconds. there is a class called
FrameGrabber in JMF that grabs a frame and return that frame as java.awt.Image.
Then i took that image and deinterlace it. Deinterlacing is separating the odd
line and eve line from that image. Here is more expalanation of deinterlacing :
http://en.wikipedia.org/wiki/Deinterlacing
The separation is done by extracting the pixels from the Image using pixels
grabber, which returns the int[] array, but i converted to a byte[] array to
save memory because i am video streaming the gray-scale and I am calling this
method several time in the while loop. Then after that i called this method
that i posted in the previous message, again this is also called several time
in the while loop:
public BufferedImage produceRenderedImage(byte[] dataBuffer, int width, int
height)
{
DataBuffer dBuffer = new DataBufferByte(dataBuffer, width * height);
WritableRaster wr =
Raster.createInterleavedRaster(dBuffer,width,height,width,1,new int[]{0},null);
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorModel cm = new ComponentColorModel(cs,false, false, Transparency.OPAQUE,
DataBuffer.TYPE_BYTE);
BufferedImage bi = new BufferedImage(cm, wr, false, null);
return bi;
}
there are two lines of code i am worry the most, which might cause OUT OF HEAP
MEMORY issue because in my method above i called the
>> new DataBufferByte(dataBuffer, width * height)
>> new BufferedImage(cm,wr,false,null).
The other two lines can be put outside of the method becasue they don't change
through out during the several called in while loop. they are:
>>ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
>>ColorModel cm = new ComponentColorModel(cs,false, false, Transparency.OPAQUE,
>>DataBuffer.TYPE_BYTE);
The only thing change in the above method is the dataBuffer, the byte[] data
changes in every loop from the images from the video. The dimension is the
same. Is there a way to reset the dataBuffer without the recalling new
DataBufferByte(dataBuffer, width * height)? i saw a data buffer that reset the
int (setInt() )in the DataBuffer class, but not a setByte method?
thanks
Francis
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