Re: [v4l-utils PATCH] libv4lconvert: Add support for V4L2_PIX_FMT_NV16

[Hans Verkuil <hverkuil@xs4all.nl>]

On 03/11/2016 09:40 PM, Niklas Söderlund wrote:
> NV16 are two-plane versions of the YUV 4:2:2 format (V4L2_PIX_FMT_YUVU).
> Support it by merging the two planes into a one YUVU plane and falling
> through to the V4L2_PIX_FMT_YUVU code path.

s/YUVU/YUYV/g

Can you add support for NV61 as well? Should be trivial.

Regards,

	Hans

> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
> 
> 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?
> 
>  lib/libv4lconvert/libv4lconvert-priv.h |  3 +++
>  lib/libv4lconvert/libv4lconvert.c      | 15 +++++++++++++++
>  lib/libv4lconvert/rgbyuv.c             | 17 +++++++++++++++++
>  3 files changed, 35 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..5426cb2 100644
> --- a/lib/libv4lconvert/libv4lconvert.c
> +++ b/lib/libv4lconvert/libv4lconvert.c
> @@ -98,6 +98,7 @@ 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 },
>  	/* yuv 4:2:0 formats */
>  	{ V4L2_PIX_FMT_SPCA501,		12,      6,	 3,	1 },
>  	{ V4L2_PIX_FMT_SPCA505,		12,	 6,	 3,	1 },
> @@ -1229,6 +1230,20 @@ 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");
> diff --git a/lib/libv4lconvert/rgbyuv.c b/lib/libv4lconvert/rgbyuv.c
> index 695255a..a9d6f5b 100644
> --- a/lib/libv4lconvert/rgbyuv.c
> +++ b/lib/libv4lconvert/rgbyuv.c
> @@ -295,6 +295,23 @@ 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;
> +
> +	y = src;
> +	cbcr = src + width*height;
> +	count = 0;
> +
> +	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
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>