DPB entry PicNum maximum value is 2*MaxFrameNum for interlaced
content (field_pic_flag=1).
As specified, MaxFrameNum is 2^(log2_max_frame_num_minus4 + 4)
and log2_max_frame_num_minus4 is in the range of 0 to 12,
which means pic_num should be a 32-bit field.
The v4l2_h264_dpb_entry struct needs to be padded to avoid a hole,
which might be also useful to allow future uAPI extensions.
Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
---
.../userspace-api/media/v4l/ext-ctrls-codec.rst | 5 ++++-
drivers/media/v4l2-core/v4l2-ctrls.c | 13 +++++++++++++
include/media/h264-ctrls.h | 3 ++-
include/media/v4l2-h264.h | 2 +-
4 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 46d4c8c6ad47..fc8ca4f8be25 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2049,7 +2049,10 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
* - __u16
- ``frame_num``
-
- * - __u16
+ * - __u8
+ - ``reserved[2]``
+ - Applications and drivers must set this to zero.
+ * - __u32
- ``pic_num``
-
* - __s32
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 3a8a23e34c70..0c13a7e0e63c 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1724,6 +1724,8 @@ static void std_log(const struct v4l2_ctrl *ctrl)
#define zero_padding(s) \
memset(&(s).padding, 0, sizeof((s).padding))
+#define zero_reserved(s) \
+ memset(&(s).reserved, 0, sizeof((s).reserved))
/*
* Compound controls validation requires setting unused fields/flags to zero
@@ -1734,6 +1736,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
{
struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
+ struct v4l2_ctrl_h264_decode_params *p_h264_dec_params;
struct v4l2_ctrl_hevc_sps *p_hevc_sps;
struct v4l2_ctrl_hevc_pps *p_hevc_pps;
struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
@@ -1794,7 +1797,17 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
case V4L2_CTRL_TYPE_H264_PPS:
case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
+ break;
+
case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
+ p_h264_dec_params = p;
+
+ for (i = 0; i < V4L2_H264_NUM_DPB_ENTRIES; i++) {
+ struct v4l2_h264_dpb_entry *dpb_entry =
+ &p_h264_dec_params->dpb[i];
+
+ zero_reserved(*dpb_entry);
+ }
break;
case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
index 52f3976b986c..f90fe96f0a59 100644
--- a/include/media/h264-ctrls.h
+++ b/include/media/h264-ctrls.h
@@ -212,7 +212,8 @@ enum v4l2_h264_dpb_reference {
struct v4l2_h264_dpb_entry {
__u64 reference_ts;
__u16 frame_num;
- __u16 pic_num;
+ __u8 reserved[2];
+ __u32 pic_num;
/* Note that field is indicated by v4l2_buffer.field */
__s32 top_field_order_cnt;
__s32 bottom_field_order_cnt;
diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h
index bc9ebb560ccf..1a5f26fc2a9a 100644
--- a/include/media/v4l2-h264.h
+++ b/include/media/v4l2-h264.h
@@ -33,7 +33,7 @@ struct v4l2_h264_reflist_builder {
struct {
s32 pic_order_count;
int frame_num;
- u16 pic_num;
+ u32 pic_num;
u16 longterm : 1;
} refs[V4L2_H264_NUM_DPB_ENTRIES];
s32 cur_pic_order_count;
--
2.27.0
