I have written YUYV support for PIL. YUYV is a format widely used by
crappy webcams. It's 32 bits for 2 pixels. The pixels have their own Y
values, but share U and V values. A patch is attached.
I think it might be possible to add this in pure Python, but I could not
figure out how from the documentation. Could someone help, so that I
could use PIL before the next release?
I tested it with my crappy webcam (04f2:b018 Chicony Electronics Co.,
Ltd), and it worked.
Only in Imaging-yuv/: build
diff -ru Imaging-1.1.6/libImaging/Imaging.h Imaging-yuv/libImaging/Imaging.h
--- Imaging-1.1.6/libImaging/Imaging.h 2006-12-03 06:37:25.000000000 -0500
+++ Imaging-yuv/libImaging/Imaging.h 2009-02-01 19:12:50.000000000 -0500
@@ -459,6 +459,7 @@
extern void ImagingUnpackBGR(UINT8* out, const UINT8* in, int pixels);
extern void ImagingUnpackYCC(UINT8* out, const UINT8* in, int pixels);
extern void ImagingUnpackYCCA(UINT8* out, const UINT8* in, int pixels);
+extern void ImagingUnpackYUYV(UINT8* out, const UINT8* in, int pixels);
extern void ImagingUnpackYCbCr(UINT8* out, const UINT8* in, int pixels);
extern void ImagingConvertRGB2YCbCr(UINT8* out, const UINT8* in, int pixels);
Only in Imaging-yuv/libImaging: Imaging.h~
diff -ru Imaging-1.1.6/libImaging/Unpack.c Imaging-yuv/libImaging/Unpack.c
--- Imaging-1.1.6/libImaging/Unpack.c 2006-12-03 06:37:25.000000000 -0500
+++ Imaging-yuv/libImaging/Unpack.c 2009-02-01 19:15:58.000000000 -0500
@@ -956,6 +956,7 @@
{"YCbCr", "YCbCr;L", 24, unpackRGBL},
{"YCbCr", "YCbCrX", 32, copy4},
{"YCbCr", "YCbCrK", 32, copy4},
+ {"RGB", "YUYV", 16, ImagingUnpackYUYV},
/* integer variations */
{"I", "I", 32, copy4},
Only in Imaging-yuv/libImaging: Unpack.c~
diff -ru Imaging-1.1.6/libImaging/UnpackYCC.c Imaging-yuv/libImaging/UnpackYCC.c
--- Imaging-1.1.6/libImaging/UnpackYCC.c 2006-12-03 06:37:25.000000000 -0500
+++ Imaging-yuv/libImaging/UnpackYCC.c 2009-02-01 19:34:40.000000000 -0500
@@ -131,6 +131,19 @@
rgb[2] = (b <= 0) ? 0 : (b >= 255) ? 255 : b;\
}
+#define YUV2RGB(rgb, y, u, v) {\
+ int r, g, b, C, D, E;\
+ C = y - 16;\
+ D = u - 128;\
+ E = v - 128;\
+ r = ((298 * C + 409 * E + 128) >> 8); \
+ g = ((298 * C - 100 * D - 208 * E + 128) >> 8); \
+ b = ((298 * C + 516 * D + 128) >> 8) ; \
+ rgb[0] = (r <= 0) ? 0 : (r >= 255) ? 255 : r;\
+ rgb[1] = (g <= 0) ? 0 : (g >= 255) ? 255 : g;\
+ rgb[2] = (b <= 0) ? 0 : (b >= 255) ? 255 : b;\
+}
+
void
ImagingUnpackYCC(UINT8* out, const UINT8* in, int pixels)
{
@@ -160,3 +173,18 @@
out += 4; in += 4;
}
}
+
+void
+ImagingUnpackYUYV(UINT8* out, const UINT8* in, int pixels)
+{
+ int i;
+ /* YUYV */
+ for (i = 0; i < pixels; i+=2) {
+ YUV2RGB(out, in[0], in[1], in[3]);
+ out[A] = 255;
+ out += 4;
+ YUV2RGB(out, in[2], in[1], in[3]);
+ out[A] = 255;
+ out += 4; in += 4;
+ }
+}
Only in Imaging-yuv/libImaging: UnpackYCC.c~
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