I have a cheap webcam (ID 093a:262a Pixart Imaging, Inc.), and Ubuntu 9.10 64 bit,
Skype 2.1.0.81, and lib32v4l-0 version 0.6.0-1. I start skype with
LD_PRELOAD=/usr/lib32/libv4l/v4l1compat.so, and the video image is garbled. I
believe the problem is that the webcam image starts off at 480x640 and skype asks
for YU12 at 320x240 for a test image. This results in v4lconvert_rotate90() being
called to rotate the image, and then v4lconvert_reduceandcrop_yuv420() being
called to down-size the image from 640x480 to 320x240. Unfortunately
v4lconvert_reduceandcrop_yuv420() relies on src_fmt->fmt.pix.bytesperline for
the source image, and that is still 480 (should be 640, since the image has been
rotated).
This fixes it for me:
--- ori/libv4lconvert/libv4lconvert.c 2010-02-20 22:44:28.000000000 +0000
+++ libv4l-0.6.0/libv4lconvert/libv4lconvert.c 2010-02-20 23:01:12.000000000
+0000
@@ -1088,8 +1088,10 @@
v4lprocessing_processing(data->processing, convert2_dest, &my_src_fmt);
}
- if (rotate90)
+ if (rotate90) {
v4lconvert_rotate90(rotate90_src, rotate90_dest, &my_src_fmt);
+ v4lconvert_fixup_fmt(&my_src_fmt);
+ }
if (hflip || vflip)
v4lconvert_flip(flip_src, flip_dest, &my_src_fmt, hflip, vflip);
I didn't look closely at the latest source, so it is possible this already
fixed some other way.
Richard
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