NV16 and NV61 are two-plane versions of the YUV 4:2:2 formats YUYV and
YVYU. Support both formats by merging the two planes into a one and
falling through to the V4L2_PIX_FMT_{YUYV,YVYU} code path.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
I'm sorry this is a bit of a hack. The support for NV16 are scarce and
this allowed me use it in qv4l2 so I thought it might help someone else.
I'm not to sure about the entry in supported_src_pixfmts[] is it correct
to set 'needs conversion' for my use case?
Changes since v1
- Add NV61 support
- Fixed s/YUVU/YUYV/g in commit message
lib/libv4lconvert/libv4lconvert-priv.h | 3 +++
lib/libv4lconvert/libv4lconvert.c | 31 +++++++++++++++++++++++++++++++
lib/libv4lconvert/rgbyuv.c | 15 +++++++++++++++
3 files changed, 49 insertions(+)
diff --git a/lib/libv4lconvert/libv4lconvert-priv.h b/lib/libv4lconvert/libv4lconvert-priv.h
index b77e3d3..1740efc 100644
--- a/lib/libv4lconvert/libv4lconvert-priv.h
+++ b/lib/libv4lconvert/libv4lconvert-priv.h
@@ -129,6 +129,9 @@ void v4lconvert_yuyv_to_bgr24(const unsigned char *src, unsigned char *dst,
void v4lconvert_yuyv_to_yuv420(const unsigned char *src, unsigned char *dst,
int width, int height, int stride, int yvu);
+void v4lconvert_nv16_to_yuyv(const unsigned char *src, unsigned char *dest,
+ int width, int height);
+
void v4lconvert_yvyu_to_rgb24(const unsigned char *src, unsigned char *dst,
int width, int height, int stride);
diff --git a/lib/libv4lconvert/libv4lconvert.c b/lib/libv4lconvert/libv4lconvert.c
index f62aea1..d3d8936 100644
--- a/lib/libv4lconvert/libv4lconvert.c
+++ b/lib/libv4lconvert/libv4lconvert.c
@@ -98,6 +98,8 @@ static const struct v4lconvert_pixfmt supported_src_pixfmts[] = {
{ V4L2_PIX_FMT_YUYV, 16, 5, 4, 0 },
{ V4L2_PIX_FMT_YVYU, 16, 5, 4, 0 },
{ V4L2_PIX_FMT_UYVY, 16, 5, 4, 0 },
+ { V4L2_PIX_FMT_NV16, 16, 5, 4, 1 },
+ { V4L2_PIX_FMT_NV61, 16, 5, 4, 1 },
/* yuv 4:2:0 formats */
{ V4L2_PIX_FMT_SPCA501, 12, 6, 3, 1 },
{ V4L2_PIX_FMT_SPCA505, 12, 6, 3, 1 },
@@ -1229,6 +1231,20 @@ static int v4lconvert_convert_pixfmt(struct v4lconvert_data *data,
}
break;
+ case V4L2_PIX_FMT_NV16: {
+ unsigned char *tmpbuf;
+
+ tmpbuf = v4lconvert_alloc_buffer(width * height * 2,
+ &data->convert_pixfmt_buf, &data->convert_pixfmt_buf_size);
+ if (!tmpbuf)
+ return v4lconvert_oom_error(data);
+
+ v4lconvert_nv16_to_yuyv(src, tmpbuf, width, height);
+ src_pix_fmt = V4L2_PIX_FMT_YUYV;
+ src = tmpbuf;
+ bytesperline = bytesperline * 2;
+ /* fall through */
+ }
case V4L2_PIX_FMT_YUYV:
if (src_size < (width * height * 2)) {
V4LCONVERT_ERR("short yuyv data frame\n");
@@ -1251,6 +1267,21 @@ static int v4lconvert_convert_pixfmt(struct v4lconvert_data *data,
}
break;
+ case V4L2_PIX_FMT_NV61: {
+ unsigned char *tmpbuf;
+
+ tmpbuf = v4lconvert_alloc_buffer(width * height * 2,
+ &data->convert_pixfmt_buf, &data->convert_pixfmt_buf_size);
+ if (!tmpbuf)
+ return v4lconvert_oom_error(data);
+
+ /* Note NV61 is NV16 with U and V swapped so this becomes yvyu. */
+ v4lconvert_nv16_to_yuyv(src, tmpbuf, width, height);
+ src_pix_fmt = V4L2_PIX_FMT_YVYU;
+ src = tmpbuf;
+ bytesperline = bytesperline * 2;
+ /* fall through */
+ }
case V4L2_PIX_FMT_YVYU:
if (src_size < (width * height * 2)) {
V4LCONVERT_ERR("short yvyu data frame\n");
diff --git a/lib/libv4lconvert/rgbyuv.c b/lib/libv4lconvert/rgbyuv.c
index 695255a..a0f8256 100644
--- a/lib/libv4lconvert/rgbyuv.c
+++ b/lib/libv4lconvert/rgbyuv.c
@@ -295,6 +295,21 @@ void v4lconvert_yuyv_to_yuv420(const unsigned char *src, unsigned char *dest,
}
}
+void v4lconvert_nv16_to_yuyv(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ const unsigned char *y, *cbcr;
+ int count = 0;
+
+ y = src;
+ cbcr = src + width*height;
+
+ while (count++ < width*height) {
+ *dest++ = *y++;
+ *dest++ = *cbcr++;
+ }
+}
+
void v4lconvert_yvyu_to_bgr24(const unsigned char *src, unsigned char *dest,
int width, int height, int stride)
{
--
2.7.2
--
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