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SubjectRe: [PATCH v3 3/4] [media] s5p-mfc: Set colorspace in VIDIO_{G,TRY}_FMT
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On 02/10/2017 03:10 PM, Thibault Saunier wrote:
> The media documentation says that the V4L2_COLORSPACE_SMPTE170M colorspace
> should be used for SDTV and V4L2_COLORSPACE_REC709 for HDTV but the driver
> didn't set the colorimetry, also respect usespace setting.
>
> Use 576p display resolution as a threshold to set this.
>
> Signed-off-by: Thibault Saunier <thibault.saunier@osg.samsung.com>
>
> ---
>
> Changes in v3:
> - Do not check values in the g_fmt functions as Andrzej explained in previous review
> - Set colorspace if user passed V4L2_COLORSPACE_DEFAULT in
>
> Changes in v2: None
>
> drivers/media/platform/s5p-mfc/s5p_mfc_dec.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> index 367ef8e8dbf0..16bc3eaad0ff 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> @@ -354,6 +354,11 @@ static int vidioc_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
> pix_mp->plane_fmt[0].sizeimage = ctx->luma_size;
> pix_mp->plane_fmt[1].bytesperline = ctx->buf_width;
> pix_mp->plane_fmt[1].sizeimage = ctx->chroma_size;
> +
> + if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
> + pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> + else /* SD */
> + pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
> } else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> /* This is run on OUTPUT
> The buffer contains compressed image
> @@ -378,6 +383,7 @@ static int vidioc_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
> static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f)
> {
> struct s5p_mfc_dev *dev = video_drvdata(file);
> + struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> struct s5p_mfc_fmt *fmt;
>
> mfc_debug(2, "Type is %d\n", f->type);
> @@ -405,6 +411,15 @@ static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f)
> mfc_err("Unsupported format by this MFC version.\n");
> return -EINVAL;
> }
> +
> + if (pix_mp->colorspace != V4L2_COLORSPACE_REC709 &&
> + pix_mp->colorspace != V4L2_COLORSPACE_SMPTE170M) {
> + if (pix_mp->width > 720 &&
> + pix_mp->height > 576) /* HD */
> + pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> + else /* SD */
> + pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
> + }
> }
>
> return 0;
>

Same here: it is an mem2mem device, so it just preserves whatever colorspace the
application passes in.

Just look at what several other mem2mem device drivers do.

Regards,

Hans

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