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Added support for V4L2_PIX_FMT_SGRBG8 pixel format to V4L2 backend #25249

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Merged
merged 1 commit into from
Mar 25, 2024
Merged

Added support for V4L2_PIX_FMT_SGRBG8 pixel format to V4L2 backend #25249

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94 changes: 94 additions & 0 deletions modules/videoio/src/cap_v4l.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -613,6 +613,7 @@ bool CvCaptureCAM_V4L::autosetup_capture_mode_v4l2()
V4L2_PIX_FMT_NV21,
V4L2_PIX_FMT_SBGGR8,
V4L2_PIX_FMT_SGBRG8,
V4L2_PIX_FMT_SGRBG8,
V4L2_PIX_FMT_XBGR32,
V4L2_PIX_FMT_ABGR32,
V4L2_PIX_FMT_SN9C10X,
Expand Down Expand Up @@ -679,6 +680,7 @@ bool CvCaptureCAM_V4L::convertableToRgb() const
case V4L2_PIX_FMT_SBGGR8:
case V4L2_PIX_FMT_SN9C10X:
case V4L2_PIX_FMT_SGBRG8:
case V4L2_PIX_FMT_SGRBG8:
case V4L2_PIX_FMT_RGB24:
case V4L2_PIX_FMT_Y16:
case V4L2_PIX_FMT_Y16_BE:
Expand Down Expand Up @@ -1487,6 +1489,94 @@ static void sgbrg2rgb24(long int WIDTH, long int HEIGHT, unsigned char *src, uns
}
}

// SGRBG to RGB24
static void sgrbg2rgb24(long int WIDTH, long int HEIGHT, unsigned char *src, unsigned char *dst)
{
long int i;
unsigned char *rawpt, *scanpt;
long int size;

rawpt = src;
scanpt = dst;
size = WIDTH*HEIGHT;

for ( i = 0; i < size; i++ )
{
if ( (i/WIDTH) % 2 == 0 ) //even row
{
if ( (i % 2) == 0 ) //even pixel
{
if ( (i > WIDTH) && ((i % WIDTH) > 0) )
{
*scanpt++ = (*(rawpt-WIDTH) + *(rawpt+WIDTH))/2; /* R */
*scanpt++ = *(rawpt); /* G */
*scanpt++ = (*(rawpt-1)+*(rawpt+1))/2; /* B */
} else
{
/* first line or left column */

*scanpt++ = *(rawpt+WIDTH); /* R */
*scanpt++ = *(rawpt); /* G */
*scanpt++ = *(rawpt+1); /* B */
}
} else //odd pixel
{
if ( (i > WIDTH) && ((i % WIDTH) < (WIDTH-1)) )
{
*scanpt++ = (*(rawpt-WIDTH-1) + *(rawpt-WIDTH+1) +
*(rawpt+WIDTH-1) + *(rawpt+WIDTH+1)) / 4; /* R */
*scanpt++ = (*(rawpt-1) + *(rawpt+1) +
*(rawpt-WIDTH) + *(rawpt+WIDTH)) / 4; /* G */
*scanpt++ = *(rawpt); /* B */
} else
{
/* first line or right column */

*scanpt++ = *(rawpt+WIDTH-1); /* R */
*scanpt++ = (*(rawpt-1)+*(rawpt+WIDTH))/2; /* G */
*scanpt++ = *(rawpt); /* B */
}
}
} else
{ //odd row
if ( (i % 2) == 0 ) //even pixel
{
if ( (i < (WIDTH*(HEIGHT-1))) && ((i % WIDTH) > 0) )
{
*scanpt++ = *(rawpt); /* R */
*scanpt++ = (*(rawpt-1) + *(rawpt+1)+
*(rawpt-WIDTH) + *(rawpt+WIDTH)) / 4; /* G */
*scanpt++ = (*(rawpt-WIDTH-1) + *(rawpt-WIDTH+1) +
*(rawpt+WIDTH-1) + *(rawpt+WIDTH+1)) / 4; /* B */
} else
{
/* bottom line or left column */

*scanpt++ = *(rawpt); /* R */
*scanpt++ = (*(rawpt+1)+*(rawpt-WIDTH))/2; /* G */
*scanpt++ = *(rawpt-WIDTH+1); /* B */
}
} else
{ //odd pixel
if ( i < (WIDTH*(HEIGHT-1)) && ((i % WIDTH) < (WIDTH-1)) )
{
*scanpt++ = (*(rawpt-1)+*(rawpt+1))/2; /* R */
*scanpt++ = *(rawpt); /* G */
*scanpt++ = (*(rawpt-WIDTH)+*(rawpt+WIDTH))/2; /* B */
} else
{
/* bottom line or right column */

*scanpt++ = (*(rawpt-1)); /* R */
*scanpt++ = *(rawpt); /* G */
*scanpt++ = (*(rawpt-WIDTH)); /* B */
}
}
}
rawpt++;
}
}

#define CLAMP(x) ((x)<0?0:((x)>255)?255:(x))

typedef struct {
Expand Down Expand Up @@ -1706,6 +1796,10 @@ void CvCaptureCAM_V4L::convertToRgb(const Buffer &currentBuffer)
sgbrg2rgb24(imageSize.width, imageSize.height,
start, (unsigned char*)frame.imageData);
return;
case V4L2_PIX_FMT_SGRBG8:
sgrbg2rgb24(imageSize.width, imageSize.height,
start, (unsigned char*)frame.imageData);
return;
default:
break;
}
Expand Down