File	Doc	Category	Size	Date	Package
V4LCapture.java	API Doc	JMF 2.1.1e	5304	Mon May 12 12:21:30 BST 2003	com.sun.media.protocol.v4l

V4LCapture

• java.lang.Object

Fields Summary
private int	nativePeer
private boolean	supportsMMap
private boolean	supportsRead
private int	cardNo

Constructors Summary
V4LCapture(int cardNo) com.sun.media.JMFSecurityManager.loadLibrary("jmv4l"); // System.loadLibrary("jmv4l"); nativePeer = nOpen(cardNo); if (nativePeer != 0) this.cardNo = cardNo; else throw new Error("Can't open video card " + cardNo);

Methods Summary
void	close() synchronized (this) { nClose(); nativePeer = 0; }
int	formatToPalette(javax.media.Format format) if (format == null) return 0; if (format instanceof RGBFormat) { RGBFormat rgbf = (RGBFormat) format; int bpp = rgbf.getBitsPerPixel(); switch (bpp) { case 24: return VPicture.VIDEO_PALETTE_RGB24; case 16: if (rgbf.getGreenMask() == (0x3F << 5)) return VPicture.VIDEO_PALETTE_RGB565; else return VPicture.VIDEO_PALETTE_RGB555; case 32: return VPicture.VIDEO_PALETTE_RGB32; } return 0; } else if (format instanceof YUVFormat) { YUVFormat yuvf = (YUVFormat) format; switch (yuvf.getYuvType()) { case YUVFormat.YUV_YUYV: if (yuvf.getOffsetY() == 0) return VPicture.VIDEO_PALETTE_YUV422; else // Not necessarily, but because the inverse function supports only these two return VPicture.VIDEO_PALETTE_UYVY; case YUVFormat.YUV_420: return VPicture.VIDEO_PALETTE_YUV420P; } } // Not one of the supported types return 0;
native int	getCapability(VCapability vcap)
native int	getChannel(VChannel vchan)
native int	getFrequency()
native int	getPicture(VPicture vpict)
native int	getTuner(VTuner vtuner)
native int	nClose()
native int	nOpen(int cardNo)
int	paletteToDepth(int palette) int p2d [] = { 0, 8, // VIDEO_PALETTE_GREY 8, // VIDEO_PALETTE_HI240 16, // VIDEO_PALETTE_RGB565 24, // VIDEO_PALETTE_RGB24 32, // VIDEO_PALETTE_RGB32 16, // VIDEO_PALETTE_RGB555 16, // VIDEO_PALETTE_YUV422 16, // VIDEO_PALETTE_YUYV 16, // VIDEO_PALETTE_UYVY 12, // VIDEO_PALETTE_YUV420 12, // VIDEO_PALETTE_YUV411 12, // VIDEO_PALETTE_RAW 16, // VIDEO_PALETTE_YUV422P 12, // VIDEO_PALETTE_YUV411P 12, // VIDEO_PALETTE_YUV420P 12, // VIDEO_PALETTE_YUV410P 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; return p2d[palette];
javax.media.format.VideoFormat	paletteToFormat(int palette, java.awt.Dimension size) int area = size.width * size.height; VideoFormat format; switch (palette) { case VPicture.VIDEO_PALETTE_RGB565 : format = new RGBFormat(size, area * 2, Format.byteArray, Format.NOT_SPECIFIED, 16, 0x1F << 11, 0x3F << 5, 0x1F, 2, size.width * 2, Format.FALSE, RGBFormat.LITTLE_ENDIAN); break; case VPicture.VIDEO_PALETTE_RGB24 : format = new RGBFormat(size, area * 3, Format.byteArray, Format.NOT_SPECIFIED, 24, 3, 2, 1, 3, size.width * 3, Format.FALSE, Format.NOT_SPECIFIED); break; case VPicture.VIDEO_PALETTE_RGB32 : format = new RGBFormat(size, area * 4, Format.byteArray, Format.NOT_SPECIFIED, 32, 1, 2, 3, 4, size.width * 4, Format.FALSE, Format.NOT_SPECIFIED); break; case VPicture.VIDEO_PALETTE_RGB555 : format = new RGBFormat(size, area * 2, Format.byteArray, Format.NOT_SPECIFIED, 16, 0x1F << 10, 0x1F << 5, 0x1F, 2, size.width * 2, Format.FALSE, RGBFormat.LITTLE_ENDIAN); break; case VPicture.VIDEO_PALETTE_YUV422 : case VPicture.VIDEO_PALETTE_YUYV : format = new YUVFormat(size, area * 2, Format.byteArray, Format.NOT_SPECIFIED, YUVFormat.YUV_YUYV, size.width * 2, size.width * 2, 0, 1, 3); break; case VPicture.VIDEO_PALETTE_UYVY : format = new YUVFormat(size, area * 2, Format.byteArray, Format.NOT_SPECIFIED, YUVFormat.YUV_YUYV, size.width * 2, size.width * 2, 1, 0, 2); break; case VPicture.VIDEO_PALETTE_YUV420P : format = new YUVFormat(size, area + (area / 2), Format.byteArray, Format.NOT_SPECIFIED, YUVFormat.YUV_420, size.width, size.width / 2, 0, area, area + (area / 4)); break; // TODO : Rest of the formats default : format = null; } return format;
native int	readNextFrame(byte[] buffer, int offset, int length)
native int	setChannel(VChannel vchan)
native int	setFormat(int depth, int palette, int width, int height, float frameRate)
native int	setFrequency(int freq)
native int	setPicture(VPicture vpict)
native int	setTuner(VTuner vtuner)
native int	start()
native int	stop()