[PATCH v2 11/12] staging: media: rkvdec: Enable S_CTRL IOCTL

[Sebastian Fricke]

Enable user-space to set the SPS of the current byte-stream on the
decoder. This action will enable the decoder to pick the optimal
pixel-format for the capture queue, whenever it is required.

Signed-off-by: Sebastian Fricke <sebastian.fricke at collabora.com>
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 drivers/staging/media/rkvdec/rkvdec.c | 81 +++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index b303c6e0286d..3d413c5ad1d2 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -93,6 +93,79 @@ static int rkvdec_get_sps_attributes(struct rkvdec_ctx *ctx, void *sps,
 	return 0;
 }
 
+static int rkvdec_set_sps(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_pix_format_mplane *pix_mp;
+	struct sps_attributes attributes = {0};
+	void *new_sps = NULL;
+
+	/*
+	 * SPS structures are not filled until the control handler is set up
+	 */
+	if (!ctx->fh.ctrl_handler)
+		return 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_STATELESS_H264_SPS:
+		new_sps = (void *)ctrl->p_new.p_h264_sps;
+		break;
+	case V4L2_CID_STATELESS_HEVC_SPS:
+		new_sps = (void *)ctrl->p_new.p_hevc_sps;
+		break;
+	default:
+		dev_err(ctx->dev->dev, "Unsupported stateless control ID: %x\n", ctrl->id);
+		return -EINVAL;
+	};
+	rkvdec_get_sps_attributes(ctx, new_sps, &attributes);
+
+	/*
+	 * Providing an empty SPS is valid but we do not store it.
+	 */
+	if (attributes.width == 0 && attributes.height == 0)
+		return 0;
+
+	pix_mp = &ctx->decoded_fmt.fmt.pix_mp;
+
+	/*
+	 * SPS must match the provided format dimension, if it doesn't userspace has to
+	 * first reset the output format
+	 */
+	if ((attributes.width > pix_mp->width) || (attributes.height > pix_mp->height)) {
+		dev_err(ctx->dev->dev,
+			"Dimension mismatch. [%s SPS] W: %d, H: %d, [Format] W: %d, H: %d)\n",
+			ctrl->id == V4L2_CID_STATELESS_HEVC_SPS ? "HEVC" : "H264",
+			attributes.width, attributes.height, pix_mp->width, pix_mp->height);
+		return -EINVAL;
+	}
+
+	if (ctx->sps && pix_mp->pixelformat == rkvdec_get_valid_fmt(ctx)) {
+		/*
+		 * Userspace is allowed to change the SPS at any point, if the
+		 * pixel format doesn't differ from the format in the context,
+		 * just accept the change even if buffers are queued
+		 */
+		ctx->sps = new_sps;
+	} else {
+		/*
+		 * Do not accept changing the SPS, while buffers are queued,
+		 * when the new SPS would cause switching the CAPTURE pixel format
+		 */
+		if (pix_mp->pixelformat != rkvdec_get_valid_fmt(ctx)) {
+			if (rkvdec_queue_busy(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE))
+				return -EBUSY;
+		}
+		ctx->sps = new_sps;
+		/*
+		 * For the initial SPS setting and when the pixel format is
+		 * changed adjust the pixel format stored in the context
+		 */
+		pix_mp->pixelformat = rkvdec_get_valid_fmt(ctx);
+		rkvdec_fill_decoded_pixfmt(ctx, pix_mp);
+	}
+
+	return 0;
+}
+
 static int rkvdec_try_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct rkvdec_ctx *ctx = container_of(ctrl->handler, struct rkvdec_ctx, ctrl_hdl);
@@ -104,8 +177,16 @@ static int rkvdec_try_ctrl(struct v4l2_ctrl *ctrl)
 	return 0;
 }
 
+static int rkvdec_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct rkvdec_ctx *ctx = container_of(ctrl->handler, struct rkvdec_ctx, ctrl_hdl);
+
+	return rkvdec_set_sps(ctx, ctrl);
+}
+
 static const struct v4l2_ctrl_ops rkvdec_ctrl_ops = {
 	.try_ctrl = rkvdec_try_ctrl,
+	.s_ctrl = rkvdec_s_ctrl,
 };
 
 static const struct rkvdec_ctrl_desc rkvdec_h264_ctrl_descs[] = {

-- 
2.25.1