PawletOS/external_libcamera
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

qcam: format_converter: Add NV formats support

Browse Source 
Add support for some NV formats:
- V4L2_PIX_FMT_NV12, V4L2_PIX_FMT_NV21
- V4L2_PIX_FMT_NV16, V4L2_PIX_FMT_NV61
- V4L2_PIX_FMT_NV24, V4L2_PIX_FMT_NV42

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Paul Elder
2019-05-07 09:27:07 -04:00
parent b09b13dbf6
commit b9a47058eb
2 changed files with 96 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/qcam/format_converter.cpp
+89 -10
View File
@@ -31,6 +31,42 @@ int FormatConverter::configure(unsigned int format, unsigned int width,
unsigned int height)
{
switch (format) {
case V4L2_PIX_FMT_NV12:
formatFamily_ = NV;
horzSubSample_ = 2;
vertSubSample_ = 2;
nvSwap_ = false;
break;
case V4L2_PIX_FMT_NV21:
formatFamily_ = NV;
horzSubSample_ = 2;
vertSubSample_ = 2;
nvSwap_ = true;
break;
case V4L2_PIX_FMT_NV16:
formatFamily_ = NV;
horzSubSample_ = 2;
vertSubSample_ = 1;
nvSwap_ = false;
break;
case V4L2_PIX_FMT_NV61:
formatFamily_ = NV;
horzSubSample_ = 2;
vertSubSample_ = 1;
nvSwap_ = true;
break;
case V4L2_PIX_FMT_NV24:
formatFamily_ = NV;
horzSubSample_ = 1;
vertSubSample_ = 1;
nvSwap_ = false;
break;
case V4L2_PIX_FMT_NV42:
formatFamily_ = NV;
horzSubSample_ = 1;
vertSubSample_ = 1;
nvSwap_ = true;
break;
case V4L2_PIX_FMT_BGR24:
formatFamily_ = RGB;
r_pos_ = 2;
@@ -99,9 +135,62 @@ void FormatConverter::convert(const unsigned char *src, size_t size,
case RGB:
convertRGB(src, dst->bits());
break;
case NV:
convertNV(src, dst->bits());
break;
};
}
static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
{
int c = y - 16;
int d = u - 128;
int e = v - 128;
*r = CLIP(( 298 * c + 409 * e + 128) >> RGBSHIFT);
*g = CLIP(( 298 * c - 100 * d - 208 * e + 128) >> RGBSHIFT);
*b = CLIP(( 298 * c + 516 * d + 128) >> RGBSHIFT);
}
void FormatConverter::convertNV(const unsigned char *src, unsigned char *dst)
{
unsigned int c_stride = width_ * (2 / horzSubSample_);
unsigned int c_inc = horzSubSample_ == 1 ? 2 : 0;
unsigned int cb_pos = nvSwap_ ? 1 : 0;
unsigned int cr_pos = nvSwap_ ? 0 : 1;
const unsigned char *src_c = src + width_ * height_;
int r, g, b;
for (unsigned int y = 0; y < height_; y++) {
const unsigned char *src_y = src + y * width_;
const unsigned char *src_cb = src_c + (y / vertSubSample_) *
c_stride + cb_pos;
const unsigned char *src_cr = src_c + (y / vertSubSample_) *
c_stride + cr_pos;
for (unsigned int x = 0; x < width_; x += 2) {
yuv_to_rgb(*src_y, *src_cb, *src_cr, &r, &g, &b);
dst[0] = b;
dst[1] = g;
dst[2] = r;
dst[3] = 0xff;
src_y++;
src_cb += c_inc;
src_cr += c_inc;
dst += 4;
yuv_to_rgb(*src_y, *src_cb, *src_cr, &r, &g, &b);
dst[0] = b;
dst[1] = g;
dst[2] = r;
dst[3] = 0xff;
src_y++;
src_cb += 2;
src_cr += 2;
dst += 4;
}
}
}
void FormatConverter::convertRGB(const unsigned char *src, unsigned char *dst)
{
unsigned int x, y;
@@ -124,16 +213,6 @@ void FormatConverter::convertRGB(const unsigned char *src, unsigned char *dst)
}
}
static void yuv_to_rgb(int y, int u, int v, int *r, int *g, int *b)
{
int c = y - 16;
int d = u - 128;
int e = v - 128;
*r = CLIP(( 298 * c + 409 * e + 128) >> RGBSHIFT);
*g = CLIP(( 298 * c - 100 * d - 208 * e + 128) >> RGBSHIFT);
*b = CLIP(( 298 * c + 516 * d + 128) >> RGBSHIFT);
}
void FormatConverter::convertYUV(const unsigned char *src, unsigned char *dst)
{
unsigned int src_x, src_y, dst_x, dst_y;
src/qcam/format_converter.h
+7
View File
@@ -22,10 +22,12 @@ public:
private:
enum FormatFamily {
MJPEG,
NV,
RGB,
YUV,
};
void convertNV(const unsigned char *src, unsigned char *dst);
void convertRGB(const unsigned char *src, unsigned char *dst);
void convertYUV(const unsigned char *src, unsigned char *dst);
@@ -35,6 +37,11 @@ private:
enum FormatFamily formatFamily_;
/* NV parameters */
unsigned int horzSubSample_;
unsigned int vertSubSample_;
bool nvSwap_;
/* RGB parameters */
unsigned int bpp_;
unsigned int r_pos_;