[PATCH v3 16/24] media: rkvdec: h264: Validate and use pic width and height in mbs

Nicolas Dufresne
2022-04-05T20:45:20Z

From: Jonas Karlman <jonas@kwiboo.se>

The width and height in macroblocks is currently configured based on OUTPUT
buffer resolution, this works for frame pictures but can cause issues for
field pictures.

When frame_mbs_only_flag is 0 the height in mbs should be height of
the field instead of height of frame.

Validate pic_width_in_mbs_minus1 and pic_height_in_map_units_minus1
against OUTPUT buffer resolution and use these values to configure HW.
The validation is happening in both try_ctrt() and start() since it is
otherwise possible to trick the driver during initialization by changing
the OUTPUT format after having set a valid control.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
---
drivers/staging/media/rkvdec/rkvdec-h264.c | 78 ++++++++++++++++------
1 file changed, 59 insertions(+), 19 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
index 0dcbcb1bac80..f081b476340f 100644
--- a/drivers/staging/media/rkvdec/rkvdec-h264.c
+++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
@@ -672,8 +672,16 @@ static void assemble_hw_pps(struct rkvdec_ctx *ctx,
LOG2_MAX_PIC_ORDER_CNT_LSB_MINUS4);
WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO),
DELTA_PIC_ORDER_ALWAYS_ZERO_FLAG);
- WRITE_PPS(DIV_ROUND_UP(ctx->coded_fmt.fmt.pix_mp.width, 16), PIC_WIDTH_IN_MBS);
- WRITE_PPS(DIV_ROUND_UP(ctx->coded_fmt.fmt.pix_mp.height, 16), PIC_HEIGHT_IN_MBS);
+
+ /* Use the SPS values since they are already in macroblocks
+ * dimensions, height can be field height (halved) if
+ * V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY is not set and also it allows
+ * decoding smaller images into larger allocation which can be used
+ * to implementing SVC spatial layer support.
+ */
+ WRITE_PPS(sps->pic_width_in_mbs_minus1 + 1, PIC_WIDTH_IN_MBS);
+ WRITE_PPS(sps->pic_height_in_map_units_minus1 + 1, PIC_HEIGHT_IN_MBS);
+
WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY),
FRAME_MBS_ONLY_FLAG);
WRITE_PPS(!!(sps->flags & V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD),
@@ -1035,13 +1043,59 @@ static int rkvdec_h264_adjust_fmt(struct rkvdec_ctx *ctx,
return 0;
}

+static int rkvdec_h264_validate_sps(struct rkvdec_ctx *ctx,
+ const struct v4l2_ctrl_h264_sps *sps)
+{
+ unsigned int width, height;
+ /*
+ * TODO: The hardware supports 10-bit and 4:2:2 profiles,
+ * but it's currently broken in the driver.
+ * Reject them for now, until it's fixed.
+ */
+ if (sps->chroma_format_idc > 1)
+ /* Only 4:0:0 and 4:2:0 are supported */
+ return -EINVAL;
+ if (sps->bit_depth_luma_minus8 != sps->bit_depth_chroma_minus8)
+ /* Luma and chroma bit depth mismatch */
+ return -EINVAL;
+ if (sps->bit_depth_luma_minus8 != 0)
+ /* Only 8-bit is supported */
+ return -EINVAL;
+
+ width = (sps->pic_width_in_mbs_minus1 + 1) * 16;
+ height = (sps->pic_height_in_map_units_minus1 + 1) * 16;
+
+ /* when frame_mbs_only_flag is not set, this is field height,
+ * which is half the final height (see (7-18) in the
+ * specification)
+ */
+ if (!(sps->flags & V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY))
+ height *= 2;
+
+ if (width > ctx->coded_fmt.fmt.pix_mp.width ||
+ height > ctx->coded_fmt.fmt.pix_mp.height)
+ return -EINVAL;
+
+ return 0;
+}
+
static int rkvdec_h264_start(struct rkvdec_ctx *ctx)
{
struct rkvdec_dev *rkvdec = ctx->dev;
struct rkvdec_h264_priv_tbl *priv_tbl;
struct rkvdec_h264_ctx *h264_ctx;
+ struct v4l2_ctrl *ctrl;
int ret;

+ ctrl = v4l2_ctrl_find(&ctx->ctrl_hdl,
+ V4L2_CID_STATELESS_H264_SPS);
+ if (!ctrl)
+ return -EINVAL;
+
+ ret = rkvdec_h264_validate_sps(ctx, ctrl->p_new.p_h264_sps);
+ if (ret)
+ return ret;
+
h264_ctx = kzalloc(sizeof(*h264_ctx), GFP_KERNEL);
if (!h264_ctx)
return -ENOMEM;
@@ -1139,23 +1193,9 @@ static int rkvdec_h264_run(struct rkvdec_ctx *ctx)

static int rkvdec_h264_try_ctrl(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl)
{
- if (ctrl->id == V4L2_CID_STATELESS_H264_SPS) {
- const struct v4l2_ctrl_h264_sps *sps = ctrl->p_new.p_h264_sps;
- /*
- * TODO: The hardware supports 10-bit and 4:2:2 profiles,
- * but it's currently broken in the driver.
- * Reject them for now, until it's fixed.
- */
- if (sps->chroma_format_idc > 1)
- /* Only 4:0:0 and 4:2:0 are supported */
- return -EINVAL;
- if (sps->bit_depth_luma_minus8 != sps->bit_depth_chroma_minus8)
- /* Luma and chroma bit depth mismatch */
- return -EINVAL;
- if (sps->bit_depth_luma_minus8 != 0)
- /* Only 8-bit is supported */
- return -EINVAL;
- }
+ if (ctrl->id == V4L2_CID_STATELESS_H264_SPS)
+ return rkvdec_h264_validate_sps(ctx, ctrl->p_new.p_h264_sps);
+
return 0;
}