Hi! > > > I don't see why it would be hard to open files or have threads inside > > > a library. There are several libraries that do that already, specially > > > the ones designed to be used on multimidia apps. > > > > Well, This is what the libv4l2 says: > > > > This file implements libv4l2, which offers v4l2_ prefixed versions > > of > > open/close/etc. The API is 100% the same as directly opening > > /dev/videoX > > using regular open/close/etc, the big difference is that format > > conversion > > > > but if I open additional files in v4l2_open(), API is no longer the > > same, as unix open() is defined to open just one file descriptor. > > > > Now. There is autogain support in libv4lconvert, but it expects to use > > same fd for camera and for the gain... which does not work with > > subdevs. > > > > Of course, opening subdevs by name like this is not really > > acceptable. But can you suggest a method that is? > > There are two separate things here: > > 1) Autofoucs for a device that doesn't use subdev API > 2) libv4l2 support for devices that require MC and subdev API
Actually there are three: 0) autogain. Unfortunately, I need autogain first before autofocus has a chance... And that means... bayer10 support for autogain. Plus, I changed avg_lum to long long. Quick calculation tells me int could overflow with few megapixel sensor. Oh, btw http://ytse.tricolour.net/docs/LowLightOptimization.html no longer works. Regards, Pavel diff --git a/lib/libv4lconvert/processing/autogain.c b/lib/libv4lconvert/processing/autogain.c index c6866d6..0b52d0f 100644 --- a/lib/libv4lconvert/processing/autogain.c +++ b/lib/libv4lconvert/processing/autogain.c @@ -68,6 +71,41 @@ static void autogain_adjust(struct v4l2_queryctrl *ctrl, int *value, } } +static int get_luminosity_bayer10(uint16_t *buf, const struct v4l2_format *fmt) +{ + long long avg_lum = 0; + int x, y; + + buf += fmt->fmt.pix.height * fmt->fmt.pix.bytesperline / 4 + + fmt->fmt.pix.width / 4; + + for (y = 0; y < fmt->fmt.pix.height / 2; y++) { + for (x = 0; x < fmt->fmt.pix.width / 2; x++) + avg_lum += *buf++; + buf += fmt->fmt.pix.bytesperline - fmt->fmt.pix.width / 2; + } + avg_lum /= fmt->fmt.pix.height * fmt->fmt.pix.width / 4; + avg_lum /= 4; + return avg_lum; +} + +static int get_luminosity_bayer8(unsigned char *buf, const struct v4l2_format *fmt) +{ + long long avg_lum = 0; + int x, y; + + buf += fmt->fmt.pix.height * fmt->fmt.pix.bytesperline / 4 + + fmt->fmt.pix.width / 4; + + for (y = 0; y < fmt->fmt.pix.height / 2; y++) { + for (x = 0; x < fmt->fmt.pix.width / 2; x++) + avg_lum += *buf++; + buf += fmt->fmt.pix.bytesperline - fmt->fmt.pix.width / 2; + } + avg_lum /= fmt->fmt.pix.height * fmt->fmt.pix.width / 4; + return avg_lum; +} + /* auto gain and exposure algorithm based on the knee algorithm described here: http://ytse.tricolour.net/docs/LowLightOptimization.html */ static int autogain_calculate_lookup_tables( @@ -100,17 +142,16 @@ static int autogain_calculate_lookup_tables( switch (fmt->fmt.pix.pixelformat) { + case V4L2_PIX_FMT_SGBRG10: + case V4L2_PIX_FMT_SGRBG10: + case V4L2_PIX_FMT_SBGGR10: + case V4L2_PIX_FMT_SRGGB10: + avg_lum = get_luminosity_bayer10((void *) buf, fmt); + break; + case V4L2_PIX_FMT_SGBRG8: case V4L2_PIX_FMT_SGRBG8: case V4L2_PIX_FMT_SBGGR8: case V4L2_PIX_FMT_SRGGB8: - buf += fmt->fmt.pix.height * fmt->fmt.pix.bytesperline / 4 + - fmt->fmt.pix.width / 4; - - for (y = 0; y < fmt->fmt.pix.height / 2; y++) { - for (x = 0; x < fmt->fmt.pix.width / 2; x++) - avg_lum += *buf++; - buf += fmt->fmt.pix.bytesperline - fmt->fmt.pix.width / 2; - } - avg_lum /= fmt->fmt.pix.height * fmt->fmt.pix.width / 4; + avg_lum = get_luminosity_bayer8(buf, fmt); break; case V4L2_PIX_FMT_RGB24: diff --git a/lib/libv4lconvert/processing/libv4lprocessing.c b/lib/libv4lconvert/processing/libv4lprocessing.c index b061f50..b98d024 100644 --- a/lib/libv4lconvert/processing/libv4lprocessing.c +++ b/lib/libv4lconvert/processing/libv4lprocessing.c @@ -164,6 +165,10 @@ void v4lprocessing_processing(struct v4lprocessing_data *data, case V4L2_PIX_FMT_SGRBG8: case V4L2_PIX_FMT_SBGGR8: case V4L2_PIX_FMT_SRGGB8: + case V4L2_PIX_FMT_SGBRG10: + case V4L2_PIX_FMT_SGRBG10: + case V4L2_PIX_FMT_SBGGR10: + case V4L2_PIX_FMT_SRGGB10: case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: break; -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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