[PATCH v3 00/19] Clean H264 stateless uAPI

[Ezequiel Garcia <ezequiel@collabora.com>]

One more round for the H.264 uAPI cleanup, which as discussed
aims at being stabilized and promoted as a first-class public uAPI soon.

The biggest change here is the rename (and implementation in drivers)
of the V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT flag. The semantics
of this flag are now properly specified and implemented as
discussed on the mailing list, https://lkml.org/lkml/2020/8/11/888.

Note that your favourite rabbit's video may omit a scaling matrix,
as well as any video with a profile lower than High. So, proper testing
of these patches requires a video that specifies some (non-flat) scaling matrix.

It should be noted that there is already GStreamer native
support for this interface, which will be part of 1.18,
once it's released.

I have pushed a branch porting GStreamer to
support these interface changes:

https://gitlab.freedesktop.org/ezequielgarcia/gst-plugins-bad/-/commits/for_h264_uapi_v4

Changelog:

v2->v3:
* Clarify SCALING_MATRIX present flag.
* Implement optional scaling matrix on hantro, rkvdec and cedrus.
* Make prediction weight table properly optional on cedrus.
* Rename field reference types.

v1->v2:
* Clean SLICE_PARAMS documentation, which we don't
  expect to be part of an array anymore. 
* Clarify how frame-based and slice-based modes
  are expected to work.
* Add Cedrus patches to fix field references,
  as requested by Jernej.
* Fix wrongly removed SPS in rkvdec.
* Fix rkvdec DPB reference implementation.
* Fix missing Cedrus and missing control member,
  for prediction weight table control.
* Say "raster scan" instead of "matrix" in the docs.
* Drop duplicated macros and use v4l2_h264_dpb_reference
  for the DPB reference signalling.

RFC->v1: 
* Split prediction weight table to a separate control.
* Increase size of first_mb_in_slice field.
* Cleanup DPB entry interface, to support field coding.
* Increase of DPB entry pic_num field.
* Move slice invariant fields to the per-frame control.

Ezequiel Garcia (15):
  media: uapi: h264: Further clarify scaling lists order
  media: uapi: h264: Split prediction weight parameters
  media: uapi: h264: Increase size of 'first_mb_in_slice' field
  media: uapi: h264: Clean DPB entry interface
  media: uapi: h264: Increase size of DPB entry pic_num
  media: uapi: h264: Drop SLICE_PARAMS 'size' field
  media: uapi: h264: Clarify SLICE_BASED mode
  media: uapi: h264: Clean slice invariants syntax elements
  media: uapi: h264: Rename and clarify PPS_FLAG_SCALING_MATRIX_PRESENT
  media: hantro: Don't require unneeded H264_SLICE_PARAMS
  media: rkvdec: Don't require unneeded H264_SLICE_PARAMS
  media: rkvdec: Drop unneeded per_request driver-specific control flag
  media: rkvdec: Use H264_SCALING_MATRIX only when required
  media: hantro: Use H264_SCALING_MATRIX only when required
  media: cedrus: Use H264_SCALING_MATRIX only when required

Jernej Skrabec (3):
  media: uapi: h264: Update reference lists
  media: cedrus: h264: Properly configure reference field
  media: cedrus: h264: Fix frame list construction

Philipp Zabel (1):
  media: uapi: h264: Clarify pic_order_cnt_bit_size field

 .../media/v4l/ext-ctrls-codec.rst             | 229 ++++++++++--------
 drivers/media/v4l2-core/v4l2-ctrls.c          |  28 +++
 drivers/media/v4l2-core/v4l2-h264.c           |  12 +-
 drivers/staging/media/hantro/hantro_drv.c     |   5 -
 .../staging/media/hantro/hantro_g1_h264_dec.c |  26 +-
 drivers/staging/media/hantro/hantro_h264.c    |  12 +-
 drivers/staging/media/hantro/hantro_hw.h      |   2 -
 drivers/staging/media/rkvdec/rkvdec-h264.c    |  37 ++-
 drivers/staging/media/rkvdec/rkvdec.c         |  12 +-
 drivers/staging/media/rkvdec/rkvdec.h         |   1 -
 drivers/staging/media/sunxi/cedrus/cedrus.c   |   9 +-
 drivers/staging/media/sunxi/cedrus/cedrus.h   |   1 +
 .../staging/media/sunxi/cedrus/cedrus_dec.c   |   2 +
 .../staging/media/sunxi/cedrus/cedrus_h264.c  |  61 +++--
 include/media/h264-ctrls.h                    |  89 ++++---
 include/media/v4l2-ctrls.h                    |   2 +
 include/media/v4l2-h264.h                     |   3 +-
 17 files changed, 290 insertions(+), 241 deletions(-)

-- 
2.27.0