A GTK3 camera application that knows how to deal with the media request api
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/*
* Fast but bad debayer method that scales and rotates by skipping source
* pixels and doesn't interpolate any values at all
*/
#include <linux/videodev2.h>
#include "quickpreview.h"
/* Linear -> sRGB lookup table */
static const int srgb[] = {
0, 12, 21, 28, 33, 38, 42, 46, 49, 52, 55, 58, 61, 63, 66, 68, 70,
73, 75, 77, 79, 81, 82, 84, 86, 88, 89, 91, 93, 94, 96, 97, 99, 100,
102, 103, 104, 106, 107, 109, 110, 111, 112, 114, 115, 116, 117, 118,
120, 121, 122, 123, 124, 125, 126, 127, 129, 130, 131, 132, 133, 134,
135, 136, 137, 138, 139, 140, 141, 142, 142, 143, 144, 145, 146, 147,
148, 149, 150, 151, 151, 152, 153, 154, 155, 156, 157, 157, 158, 159,
160, 161, 161, 162, 163, 164, 165, 165, 166, 167, 168, 168, 169, 170,
171, 171, 172, 173, 174, 174, 175, 176, 176, 177, 178, 179, 179, 180,
181, 181, 182, 183, 183, 184, 185, 185, 186, 187, 187, 188, 189, 189,
190, 191, 191, 192, 193, 193, 194, 194, 195, 196, 196, 197, 197, 198,
199, 199, 200, 201, 201, 202, 202, 203, 204, 204, 205, 205, 206, 206,
207, 208, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214,
215, 215, 216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222,
222, 223, 223, 224, 224, 225, 226, 226, 227, 227, 228, 228, 229, 229,
230, 230, 231, 231, 232, 232, 233, 233, 234, 234, 235, 235, 236, 236,
237, 237, 237, 238, 238, 239, 239, 240, 240, 241, 241, 242, 242, 243,
243, 244, 244, 245, 245, 245, 246, 246, 247, 247, 248, 248, 249, 249,
250, 250, 251, 251, 251, 252, 252, 253, 253, 254, 254, 255
};
static void quick_debayer_set_dst(uint8_t *dst, uint8_t p0, uint8_t p1,
uint8_t p2)
{
dst[0] = p0;
dst[1] = p1;
dst[2] = p2;
}
void quick_debayer(const uint8_t *source, uint8_t *destination,
uint32_t pix_fmt, int width, int height, int skip,
int blacklevel)
{
int byteskip = 2 * skip;
int input_size = width * height;
int i = 0, j = 0;
int row_left = width;
do {
uint8_t b0 = srgb[source[i] - blacklevel];
uint8_t b1 = srgb[source[i + 1] - blacklevel];
uint8_t b2 = srgb[source[i + width + 1] - blacklevel];
switch (pix_fmt) {
case V4L2_PIX_FMT_SBGGR8:
quick_debayer_set_dst(&destination[j],
b2, b1, b0);
break;
case V4L2_PIX_FMT_SGBRG8:
quick_debayer_set_dst(&destination[j],
b1, b2, b0);
break;
case V4L2_PIX_FMT_SGRBG8:
quick_debayer_set_dst(&destination[j],
b1, b0, b2);
break;
case V4L2_PIX_FMT_SRGGB8:
/* fall through */
default:
quick_debayer_set_dst(&destination[j],
b0, b1, b2);
break;
}
j += 3;
i = i + byteskip;
row_left = row_left - byteskip;
if(row_left < byteskip){
i = i + row_left;
row_left = width;
i = i + width;
i = i + (width * 2 * (skip-1));
}
} while (i < input_size);
}
// YUV format to RGB, currently only extracts the Y channel for a grayscale preview
void quick_yuv2rgb(const uint8_t *source, uint8_t *destination,
uint32_t pix_fmt, int width, int height, int skip)
{
int stride = width * 2;
int pixelsize = 4;
int input_size = width * 2 * height;
int i = 0, j = 0;
int row_left = stride;
uint8_t Y1, Y2, U, V;
do {
switch (pix_fmt) {
case V4L2_PIX_FMT_UYVY:
Y1 = source[i+1];
Y2 = source[i+3];
U = source[i];
V = source[i+2];
break;
case V4L2_PIX_FMT_YUYV:
Y1 = source[i];
Y2 = source[i+2];
U = source[i+1];
V = source[i+3];
break;
}
destination[j] = Y1;
destination[j+1] = Y1;
destination[j+2] = Y1;
j += 3;
destination[j] = Y2;
destination[j+1] = Y2;
destination[j+2] = Y2;
j += 3;
i += pixelsize * skip * 2;
row_left -= (pixelsize * skip * 2);
if(row_left < (pixelsize * skip * 2)){
i = i + row_left;
row_left = width;
i = i + (stride * skip);
}
} while (i < input_size);
}