[PATCH v1 05/24] media: h264: Store all fields into the unordered list

Nicolas Dufresne
2022-03-28T20:00:07Z

When the current picture is a field, store each field into the
unordered_list. Doing this required preserving the top and bottom field
poc.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
---
drivers/media/v4l2-core/v4l2-h264.c | 65 +++++++++++++++++++++--------
include/media/v4l2-h264.h | 6 ++-
2 files changed, 51 insertions(+), 20 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c
index 4c6bfb057bda..d5698c981973 100644
--- a/drivers/media/v4l2-core/v4l2-h264.c
+++ b/drivers/media/v4l2-core/v4l2-h264.c
@@ -47,8 +47,6 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
}

for (i = 0; i < V4L2_H264_NUM_DPB_ENTRIES; i++) {
- u32 pic_order_count;
-
if (!(dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
continue;

@@ -59,8 +57,6 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
/*
* Handle frame_num wraparound as described in section
* '8.2.4.1 Decoding process for picture numbers' of the spec.
- * TODO: This logic will have to be adjusted when we start
- * supporting interlaced content.
* For long term reference, frame_num is set to
* long_term_frame_idx which requires no wrapping.
*/
@@ -70,17 +66,33 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
else
b->refs[i].frame_num = dpb[i].frame_num;

- if (dpb[i].fields == V4L2_H264_FRAME_REF)
- pic_order_count = min(dpb[i].top_field_order_cnt,
- dpb[i].bottom_field_order_cnt);
- else if (dpb[i].fields & V4L2_H264_BOTTOM_FIELD_REF)
- pic_order_count = dpb[i].bottom_field_order_cnt;
- else
- pic_order_count = dpb[i].top_field_order_cnt;
+ b->refs[i].top_field_order_cnt = dpb[i].top_field_order_cnt;
+ b->refs[i].bottom_field_order_cnt = dpb[i].bottom_field_order_cnt;
+
+ if (b->cur_pic_fields == V4L2_H264_FRAME_REF) {
+ u8 fields = V4L2_H264_FRAME_REF;
+
+ b->unordered_reflist[b->num_valid].index = i;
+ b->unordered_reflist[b->num_valid].fields = fields;
+ b->num_valid++;
+ continue;
+ }
+
+ if (dpb[i].fields & V4L2_H264_TOP_FIELD_REF) {
+ u8 fields = V4L2_H264_TOP_FIELD_REF;
+
+ b->unordered_reflist[b->num_valid].index = i;
+ b->unordered_reflist[b->num_valid].fields = fields;
+ b->num_valid++;
+ }

- b->refs[i].pic_order_count = pic_order_count;
- b->unordered_reflist[b->num_valid].index = i;
- b->num_valid++;
+ if (dpb[i].fields & V4L2_H264_BOTTOM_FIELD_REF) {
+ u8 fields = V4L2_H264_BOTTOM_FIELD_REF;
+
+ b->unordered_reflist[b->num_valid].index = i;
+ b->unordered_reflist[b->num_valid].fields = fields;
+ b->num_valid++;
+ }
}

for (i = b->num_valid; i < ARRAY_SIZE(b->unordered_reflist); i++)
@@ -88,6 +100,23 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
}
EXPORT_SYMBOL_GPL(v4l2_h264_init_reflist_builder);

+static s32 v4l2_h264_get_poc(const struct v4l2_h264_reflist_builder *b,
+ const struct v4l2_h264_reference *ref)
+{
+ switch (ref->fields) {
+ case V4L2_H264_FRAME_REF:
+ return min(b->refs[ref->index].top_field_order_cnt,
+ b->refs[ref->index].bottom_field_order_cnt);
+ case V4L2_H264_TOP_FIELD_REF:
+ return b->refs[ref->index].top_field_order_cnt;
+ case V4L2_H264_BOTTOM_FIELD_REF:
+ return b->refs[ref->index].bottom_field_order_cnt;
+ }
+
+ /* not reached */
+ return 0;
+}
+
static int v4l2_h264_p_ref_list_cmp(const void *ptra, const void *ptrb,
const void *data)
{
@@ -150,8 +179,8 @@ static int v4l2_h264_b0_ref_list_cmp(const void *ptra, const void *ptrb,
builder->refs[idxb].pic_num ?
-1 : 1;

- poca = builder->refs[idxa].pic_order_count;
- pocb = builder->refs[idxb].pic_order_count;
+ poca = v4l2_h264_get_poc(builder, ptra);
+ pocb = v4l2_h264_get_poc(builder, ptrb);

/*
* Short term pics with POC < cur POC first in POC descending order
@@ -195,8 +224,8 @@ static int v4l2_h264_b1_ref_list_cmp(const void *ptra, const void *ptrb,
builder->refs[idxb].pic_num ?
-1 : 1;

- poca = builder->refs[idxa].pic_order_count;
- pocb = builder->refs[idxb].pic_order_count;
+ poca = v4l2_h264_get_poc(builder, ptra);
+ pocb = v4l2_h264_get_poc(builder, ptrb);

/*
* Short term pics with POC > cur POC first in POC ascending order
diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h
index e165a54c68fa..4cef717b3f18 100644
--- a/include/media/v4l2-h264.h
+++ b/include/media/v4l2-h264.h
@@ -15,7 +15,8 @@
/**
* struct v4l2_h264_reflist_builder - Reference list builder object
*
- * @refs.pic_order_count: reference picture order count
+ * @refs.top_field_order_cnt: top field order count
+ * @refs.bottom_field_order_cnt: bottom field order count
* @refs.frame_num: reference frame number
* @refs.pic_num: reference picture number
* @refs.longterm: set to true for a long term reference
@@ -32,7 +33,8 @@
*/
struct v4l2_h264_reflist_builder {
struct {
- s32 pic_order_count;
+ s32 top_field_order_cnt;
+ s32 bottom_field_order_cnt;
int frame_num;
u32 pic_num;
u16 longterm : 1;
--
2.34.1