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qcam: Add JPEG format support

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When the camera provides MJPEG, use the QImage JPEG decompression code
to convert that to RGB.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart
2019-03-29 17:20:07 +02:00
parent 29f323eea8
commit 80e236e19b
5 changed files with 27 additions and 6 deletions
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src/qcam/format_converter.cpp
+15 -1
View File
@@ -9,6 +9,8 @@
#include <linux/videodev2.h>
#include <QImage>
#include "format_converter.h"
#define RGBSHIFT 8
@@ -45,16 +47,28 @@ int FormatConverter::configure(unsigned int format, unsigned int width,
y_pos_ = 0;
cb_pos_ = 1;
break;
case V4L2_PIX_FMT_MJPEG:
break;
default:
return -EINVAL;
};
format_ = format;
width_ = width;
height_ = height;
return 0;
}
void FormatConverter::convert(const unsigned char *src, size_t size,
QImage *dst)
{
if (format_ == V4L2_PIX_FMT_MJPEG)
dst->loadFromData(src, size, "JPEG");
else
convertYUV(src, dst->bits());
}
static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
{
int c = y - 16;
@@ -65,7 +79,7 @@ static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
*b = CLIP(( 298 * c + 516 * d + 128) >> RGBSHIFT);
}
void FormatConverter::convert(const unsigned char *src, unsigned char *dst)
void FormatConverter::convertYUV(const unsigned char *src, unsigned char *dst)
{
unsigned int src_x, src_y, dst_x, dst_y;
unsigned int src_stride;