Re: [PATCH v3 07/14] v4l: ti-vpe: Add selection API in VPE driver

[Hans Verkuil <hverkuil@xs4all.nl>]

Hi Archit,

A few small comments below...

On 03/11/14 09:33, Archit Taneja wrote:
> Add selection ioctl ops. For VPE, cropping makes sense only for the input to
> VPE(or V4L2_BUF_TYPE_VIDEO_OUTPUT/MPLANE buffers) and composing makes sense
> only for the output of VPE(or V4L2_BUF_TYPE_VIDEO_CAPTURE/MPLANE buffers).
> 
> For the CAPTURE type, V4L2_SEL_TGT_COMPOSE results in VPE writing the output
> in a rectangle within the capture buffer. For the OUTPUT type, V4L2_SEL_TGT_CROP
> results in selecting a rectangle region within the source buffer.
> 
> Setting the crop/compose rectangles should successfully result in
> re-configuration of registers which are affected when either source or
> destination dimensions change, set_srcdst_params() is called for this purpose.
> 
> Signed-off-by: Archit Taneja <archit@ti.com>
> ---
>  drivers/media/platform/ti-vpe/vpe.c | 141 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 141 insertions(+)
> 
> diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
> index ece9b96..4abb85c 100644
> --- a/drivers/media/platform/ti-vpe/vpe.c
> +++ b/drivers/media/platform/ti-vpe/vpe.c
> @@ -410,8 +410,10 @@ static struct vpe_q_data *get_q_data(struct vpe_ctx *ctx,
>  {
>  	switch (type) {
>  	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> +	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
>  		return &ctx->q_data[Q_DATA_SRC];
>  	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> +	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
>  		return &ctx->q_data[Q_DATA_DST];
>  	default:
>  		BUG();
> @@ -1587,6 +1589,142 @@ static int vpe_s_fmt(struct file *file, void *priv, struct v4l2_format *f)
>  	return set_srcdst_params(ctx);
>  }
>  
> +static int __vpe_try_selection(struct vpe_ctx *ctx, struct v4l2_selection *s)
> +{
> +	struct vpe_q_data *q_data;
> +
> +	if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
> +	    (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT))
> +		return -EINVAL;
> +
> +	q_data = get_q_data(ctx, s->type);
> +	if (!q_data)
> +		return -EINVAL;
> +
> +	switch (s->target) {
> +	case V4L2_SEL_TGT_COMPOSE:
> +		/*
> +		 * COMPOSE target is only valid for capture buffer type, for
> +		 * output buffer type, assign existing crop parameters to the
> +		 * selection rectangle
> +		 */
> +		if (s->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
> +			break;

Shouldn't this return -EINVAL?

> +
> +		s->r = q_data->c_rect;
> +		return 0;
> +
> +	case V4L2_SEL_TGT_CROP:
> +		/*
> +		 * CROP target is only valid for output buffer type, for capture
> +		 * buffer type, assign existing compose parameters to the
> +		 * selection rectangle
> +		 */
> +		if (s->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
> +			break;

Ditto.

> +
> +		s->r = q_data->c_rect;
> +		return 0;
> +
> +	/*
> +	 * bound and default crop/compose targets are invalid targets to
> +	 * try/set
> +	 */
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (s->r.top < 0 || s->r.left < 0) {
> +		vpe_err(ctx->dev, "negative values for top and left\n");
> +		s->r.top = s->r.left = 0;
> +	}
> +
> +	v4l_bound_align_image(&s->r.width, MIN_W, q_data->width, 1,
> +		&s->r.height, MIN_H, q_data->height, H_ALIGN, S_ALIGN);
> +
> +	/* adjust left/top if cropping rectangle is out of bounds */
> +	if (s->r.left + s->r.width > q_data->width)
> +		s->r.left = q_data->width - s->r.width;
> +	if (s->r.top + s->r.height > q_data->height)
> +		s->r.top = q_data->height - s->r.height;
> +
> +	return 0;
> +}
> +
> +static int vpe_g_selection(struct file *file, void *fh,
> +		struct v4l2_selection *s)
> +{
> +	struct vpe_ctx *ctx = file2ctx(file);
> +	struct vpe_q_data *q_data;
> +
> +	if ((s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) &&
> +	    (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT))
> +		return -EINVAL;
> +
> +	q_data = get_q_data(ctx, s->type);
> +	if (!q_data)
> +		return -EINVAL;
> +
> +	switch (s->target) {
> +	/* return width and height from S_FMT of the respective buffer type */
> +	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
> +	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
> +	case V4L2_SEL_TGT_CROP_BOUNDS:
> +	case V4L2_SEL_TGT_CROP_DEFAULT:
> +		s->r.left = 0;
> +		s->r.top = 0;
> +		s->r.width = q_data->width;
> +		s->r.height = q_data->height;

The crop targets only make sense for type OUTPUT and the compose only for
type CAPTURE. Add some checks for that.

> +		return 0;
> +
> +	/*
> +	 * CROP target holds for the output buffer type, and COMPOSE target
> +	 * holds for the capture buffer type. We still return the c_rect params
> +	 * for both the target types.
> +	 */
> +	case V4L2_SEL_TGT_COMPOSE:
> +	case V4L2_SEL_TGT_CROP:
> +		s->r.left = q_data->c_rect.left;
> +		s->r.top = q_data->c_rect.top;
> +		s->r.width = q_data->c_rect.width;
> +		s->r.height = q_data->c_rect.height;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +
> +static int vpe_s_selection(struct file *file, void *fh,
> +		struct v4l2_selection *s)
> +{
> +	struct vpe_ctx *ctx = file2ctx(file);
> +	struct vpe_q_data *q_data;
> +	struct v4l2_selection sel = *s;
> +	int ret;
> +
> +	ret = __vpe_try_selection(ctx, &sel);
> +	if (ret)
> +		return ret;
> +
> +	q_data = get_q_data(ctx, sel.type);
> +	if (!q_data)
> +		return -EINVAL;
> +
> +	if ((q_data->c_rect.left == sel.r.left) &&
> +			(q_data->c_rect.top == sel.r.top) &&
> +			(q_data->c_rect.width == sel.r.width) &&
> +			(q_data->c_rect.height == sel.r.height)) {
> +		vpe_dbg(ctx->dev,
> +			"requested crop/compose values are already set\n");
> +		return 0;
> +	}
> +
> +	q_data->c_rect = sel.r;
> +
> +	return set_srcdst_params(ctx);
> +}
> +
>  static int vpe_reqbufs(struct file *file, void *priv,
>  		       struct v4l2_requestbuffers *reqbufs)
>  {
> @@ -1674,6 +1812,9 @@ static const struct v4l2_ioctl_ops vpe_ioctl_ops = {
>  	.vidioc_try_fmt_vid_out_mplane	= vpe_try_fmt,
>  	.vidioc_s_fmt_vid_out_mplane	= vpe_s_fmt,
>  
> +	.vidioc_g_selection		= vpe_g_selection,
> +	.vidioc_s_selection		= vpe_s_selection,
> +
>  	.vidioc_reqbufs		= vpe_reqbufs,
>  	.vidioc_querybuf	= vpe_querybuf,
>  
>