Hi,
Here is a new version of the H264 decoding support in the cedrus
driver.
As you might already know, the cedrus driver relies on the Request
API, and is a reverse engineered driver for the video decoding engine
found on the Allwinner SoCs.
This work has been possible thanks to the work done by the people
behind libvdpau-sunxi found here:
https://github.com/linux-sunxi/libvdpau-sunxi/
I've tested the various ABI using this gdb script:
http://code.bulix.org/jl4se4-505620?raw
And this test script:
http://code.bulix.org/8zle4s-505623?raw
The application compiled is quite trivial:
http://code.bulix.org/e34zp8-505624?raw
The output is:
arm: builds/arm-test-v4l2-h264-structures
SHA1: fd15b30328765c2caac877e8ea8452c829b2b1d8
x86: builds/x86-test-v4l2-h264-structures
SHA1: fd15b30328765c2caac877e8ea8452c829b2b1d8
x64: builds/x64-test-v4l2-h264-structures
SHA1: fd15b30328765c2caac877e8ea8452c829b2b1d8
arm64: builds/arm64-test-v4l2-h264-structures
SHA1: fd15b30328765c2caac877e8ea8452c829b2b1d8
Let me know if there's any flaw using that test setup, or if you have
any comments on the patches.
Maxime
Changes from v3:
- Reintroduced long term reference flag and documented it
- Reintroduced ref_pic_list_p0/b0/b1 and documented it
- Documented the DPB flags
- Treat the scaling matrix as optional in the driver, as documented
- Free the neighbor buffer
- Increase the control IDs by a large margin to be safe of collisions
- Reorder the fields documentation according to the structure layout
- Change the tag documentation by the timestamp
- Convert the sram array to size_t
- Simplify the buffer retrieval from timestamp
- Rebase
Changes from v2:
- Simplified _cedrus_write_ref_list as suggested by Jernej
- Set whether the frame is used as reference using nal_ref_idc
- Respect chroma_format_idc
- Fixes for the scaling list and prediction tables
- Wrote the documentation for the flags
- Added a bunch of defines to the driver bit fields
- Reworded the controls and data format descriptions as suggested
by Hans
- Reworked the controls' structure field size to avoid padding
- Removed the long term reference flag
- Reintroduced the neighbor info buffer
- Removed the ref_pic_list_p0/b0/b1 arrays that are redundant with the
one in the DPB
- used the timestamps instead of tags
- Rebased on 5.0-rc1
Changes from v1:
- Rebased on 4.20
- Did the documentation for the userspace API
- Used the tags instead of buffer IDs
- Added a comment to explain why we still needed the swdec trigger
- Reworked the MV col buffer in order to have one slot per frame
- Removed the unused neighbor info buffer
- Made sure to have the same structure offset and alignments across
32 bits and 64 bits architecture
Maxime Ripard (1):
media: cedrus: Add H264 decoding support
Pawel Osciak (1):
media: uapi: Add H264 low-level decoder API compound controls.
Documentation/media/uapi/v4l/biblio.rst | 9 +-
Documentation/media/uapi/v4l/extended-controls.rst | 547 +++++++++++++-
Documentation/media/uapi/v4l/pixfmt-compressed.rst | 20 +-
Documentation/media/uapi/v4l/vidioc-queryctrl.rst | 30 +-
Documentation/media/videodev2.h.rst.exceptions | 5 +-
drivers/media/v4l2-core/v4l2-ctrls.c | 42 +-
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +-
drivers/staging/media/sunxi/cedrus/Makefile | 3 +-
drivers/staging/media/sunxi/cedrus/cedrus.c | 30 +-
drivers/staging/media/sunxi/cedrus/cedrus.h | 38 +-
drivers/staging/media/sunxi/cedrus/cedrus_dec.c | 13 +-
drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 584 ++++++++++++++-
drivers/staging/media/sunxi/cedrus/cedrus_hw.c | 4 +-
drivers/staging/media/sunxi/cedrus/cedrus_regs.h | 91 ++-
drivers/staging/media/sunxi/cedrus/cedrus_video.c | 9 +-
include/media/h264-ctrls.h | 190 +++++-
include/media/v4l2-ctrls.h | 13 +-
include/uapi/linux/videodev2.h | 1 +-
18 files changed, 1627 insertions(+), 3 deletions(-)
create mode 100644 drivers/staging/media/sunxi/cedrus/cedrus_h264.c
create mode 100644 include/media/h264-ctrls.h
base-commit: aa89b613a1c52cfd25076acfbbf6266c4b6f411b
--
git-series 0.9.1
From: Pawel Osciak <[email protected]>
Stateless video codecs will require both the H264 metadata and slices in
order to be able to decode frames.
This introduces the definitions for a new pixel format for H264 slices that
have been parsed, as well as the structures used to pass the metadata from
the userspace to the kernel.
Co-Developped-by: Maxime Ripard <[email protected]>
Signed-off-by: Pawel Osciak <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
---
Documentation/media/uapi/v4l/biblio.rst | 9 +-
Documentation/media/uapi/v4l/extended-controls.rst | 547 ++++++++++++++-
Documentation/media/uapi/v4l/pixfmt-compressed.rst | 20 +-
Documentation/media/uapi/v4l/vidioc-queryctrl.rst | 30 +-
Documentation/media/videodev2.h.rst.exceptions | 5 +-
drivers/media/v4l2-core/v4l2-ctrls.c | 42 +-
drivers/media/v4l2-core/v4l2-ioctl.c | 1 +-
include/media/h264-ctrls.h | 190 +++++-
include/media/v4l2-ctrls.h | 13 +-
include/uapi/linux/videodev2.h | 1 +-
10 files changed, 857 insertions(+), 1 deletion(-)
create mode 100644 include/media/h264-ctrls.h
diff --git a/Documentation/media/uapi/v4l/biblio.rst b/Documentation/media/uapi/v4l/biblio.rst
index ec33768c055e..3fc3f7ff338a 100644
--- a/Documentation/media/uapi/v4l/biblio.rst
+++ b/Documentation/media/uapi/v4l/biblio.rst
@@ -122,6 +122,15 @@ ITU BT.1119
:author: International Telecommunication Union (http://www.itu.ch)
+.. _h264:
+
+ITU H.264
+=========
+
+:title: ITU-T Recommendation H.264 "Advanced Video Coding for Generic Audiovisual Services"
+
+:author: International Telecommunication Union (http://www.itu.ch)
+
.. _jfif:
JFIF
diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst
index 00934efdc9e4..7e27a5139732 100644
--- a/Documentation/media/uapi/v4l/extended-controls.rst
+++ b/Documentation/media/uapi/v4l/extended-controls.rst
@@ -1712,6 +1712,553 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
non-intra-coded frames, in zigzag scanning order. Only relevant for
non-4:2:0 YUV formats.
+.. _v4l2-mpeg-h264:
+
+``V4L2_CID_MPEG_VIDEO_H264_SPS (struct)``
+ Specifies the sequence parameter set (as extracted from the
+ bitstream) for the associated H264 slice data. This includes the
+ necessary parameters for configuring a stateless hardware decoding
+ pipeline for H264. The bitstream parameters are defined according
+ to :ref:`h264`. Unless there's a specific comment, refer to the
+ specification for the documentation of these fields, section 7.4.2.1.1
+ "Sequence Parameter Set Data Semantics".
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_h264_sps
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_h264_sps
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``profile_idc``
+ -
+ * - __u8
+ - ``constraint_set_flags``
+ - See :ref:`Sequence Parameter Set Constraints Set Flags <h264_sps_constraints_set_flags>`
+ * - __u8
+ - ``level_idc``
+ -
+ * - __u8
+ - ``seq_parameter_set_id``
+ -
+ * - __u8
+ - ``chroma_format_idc``
+ -
+ * - __u8
+ - ``bit_depth_luma_minus8``
+ -
+ * - __u8
+ - ``bit_depth_chroma_minus8``
+ -
+ * - __u8
+ - ``log2_max_frame_num_minus4``
+ -
+ * - __u8
+ - ``pic_order_cnt_type``
+ -
+ * - __u8
+ - ``log2_max_pic_order_cnt_lsb_minus4``
+ -
+ * - __u8
+ - ``max_num_ref_frames``
+ -
+ * - __u8
+ - ``num_ref_frames_in_pic_order_cnt_cycle``
+ -
+ * - __s32
+ - ``offset_for_ref_frame[255]``
+ -
+ * - __s32
+ - ``offset_for_non_ref_pic``
+ -
+ * - __s32
+ - ``offset_for_top_to_bottom_field``
+ -
+ * - __u16
+ - ``pic_width_in_mbs_minus1``
+ -
+ * - __u16
+ - ``pic_height_in_map_units_minus1``
+ -
+ * - __u32
+ - ``flags``
+ - See :ref:`Sequence Parameter Set Flags <h264_sps_flags>`
+
+.. _h264_sps_constraints_set_flags:
+
+``Sequence Parameter Set Constraints Set Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET0_FLAG``
+ - 0x00000001
+ -
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET1_FLAG``
+ - 0x00000002
+ -
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET2_FLAG``
+ - 0x00000004
+ -
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET3_FLAG``
+ - 0x00000008
+ -
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET4_FLAG``
+ - 0x00000010
+ -
+ * - ``V4L2_H264_SPS_CONSTRAINT_SET5_FLAG``
+ - 0x00000020
+ -
+
+.. _h264_sps_flags:
+
+``Sequence Parameter Set Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE``
+ - 0x00000001
+ -
+ * - ``V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS``
+ - 0x00000002
+ -
+ * - ``V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO``
+ - 0x00000004
+ -
+ * - ``V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED``
+ - 0x00000008
+ -
+ * - ``V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY``
+ - 0x00000010
+ -
+ * - ``V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD``
+ - 0x00000020
+ -
+ * - ``V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE``
+ - 0x00000040
+ -
+
+``V4L2_CID_MPEG_VIDEO_H264_PPS (struct)``
+ Specifies the picture parameter set (as extracted from the
+ bitstream) for the associated H264 slice data. This includes the
+ necessary parameters for configuring a stateless hardware decoding
+ pipeline for H264. The bitstream parameters are defined according
+ to :ref:`h264`. Unless there's a specific comment, refer to the
+ specification for the documentation of these fields, section 7.4.2.2
+ "Picture Parameter Set RBSP Semantics".
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_h264_pps
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_h264_pps
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``pic_parameter_set_id``
+ -
+ * - __u8
+ - ``seq_parameter_set_id``
+ -
+ * - __u8
+ - ``num_slice_groups_minus1``
+ -
+ * - __u8
+ - ``num_ref_idx_l0_default_active_minus1``
+ -
+ * - __u8
+ - ``num_ref_idx_l1_default_active_minus1``
+ -
+ * - __u8
+ - ``weighted_bipred_idc``
+ -
+ * - __s8
+ - ``pic_init_qp_minus26``
+ -
+ * - __s8
+ - ``pic_init_qs_minus26``
+ -
+ * - __s8
+ - ``chroma_qp_index_offset``
+ -
+ * - __s8
+ - ``second_chroma_qp_index_offset``
+ -
+ * - __u16
+ - ``flags``
+ - See :ref:`Picture Parameter Set Flags <h264_pps_flags>`
+
+.. _h264_pps_flags:
+
+``Picture Parameter Set Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE``
+ - 0x00000001
+ -
+ * - ``V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT``
+ - 0x00000002
+ -
+ * - ``V4L2_H264_PPS_FLAG_WEIGHTED_PRED``
+ - 0x00000004
+ -
+ * - ``V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT``
+ - 0x00000008
+ -
+ * - ``V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED``
+ - 0x00000010
+ -
+ * - ``V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT``
+ - 0x00000020
+ -
+ * - ``V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE``
+ - 0x00000040
+ -
+ * - ``V4L2_H264_PPS_FLAG_PIC_SCALING_MATRIX_PRESENT``
+ - 0x00000080
+ -
+
+``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX (struct)``
+ Specifies the scaling matrix (as extracted from the bitstream) for
+ the associated H264 slice data. The bitstream parameters are
+ defined according to :ref:`h264`. Unless there's a specific
+ comment, refer to the specification for the documentation of these
+ fields, section 7.4.2.1.1.1 "Scaling List Semantics".
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_h264_scaling_matrix
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_h264_scaling_matrix
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``scaling_list_4x4[6][16]``
+ -
+ * - __u8
+ - ``scaling_list_8x8[6][64]``
+ -
+
+``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
+ Specifies the slice parameters (as extracted from the bitstream)
+ for the associated H264 slice data. This includes the necessary
+ parameters for configuring a stateless hardware decoding pipeline
+ for H264. The bitstream parameters are defined according to
+ :ref:`h264`. Unless there's a specific comment, refer to the
+ specification for the documentation of these fields, section 7.4.3
+ "Slice Header Semantics".
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_h264_slice_param
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_h264_slice_param
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``size``
+ -
+ * - __u32
+ - ``header_bit_size``
+ -
+ * - __u16
+ - ``first_mb_in_slice``
+ -
+ * - __u8
+ - ``slice_type``
+ -
+ * - __u8
+ - ``pic_parameter_set_id``
+ -
+ * - __u8
+ - ``colour_plane_id``
+ -
+ * - __u8
+ - ``redundant_pic_cnt``
+ -
+ * - __u16
+ - ``frame_num``
+ -
+ * - __u16
+ - ``idr_pic_id``
+ -
+ * - __u16
+ - ``pic_order_cnt_lsb``
+ -
+ * - __s32
+ - ``delta_pic_order_cnt_bottom``
+ -
+ * - __s32
+ - ``delta_pic_order_cnt0``
+ -
+ * - __s32
+ - ``delta_pic_order_cnt1``
+ -
+ * - struct :c:type:`v4l2_h264_pred_weight_table`
+ - ``pred_weight_table``
+ -
+ * - __u32
+ - ``dec_ref_pic_marking_bit_size``
+ -
+ * - __u32
+ - ``pic_order_cnt_bit_size``
+ -
+ * - __u8
+ - ``cabac_init_idc``
+ -
+ * - __s8
+ - ``slice_qp_delta``
+ -
+ * - __s8
+ - ``slice_qs_delta``
+ -
+ * - __u8
+ - ``disable_deblocking_filter_idc``
+ -
+ * - __s8
+ - ``slice_alpha_c0_offset_div2``
+ -
+ * - __s8
+ - ``slice_beta_offset_div2``
+ -
+ * - __u8
+ - ``num_ref_idx_l0_active_minus1``
+ -
+ * - __u8
+ - ``num_ref_idx_l1_active_minus1``
+ -
+ * - __u32
+ - ``slice_group_change_cycle``
+ -
+ * - __u8
+ - ``ref_pic_list0[32]``
+ -
+ * - __u8
+ - ``ref_pic_list1[32]``
+ -
+ * - __u32
+ - ``flags``
+ - See :ref:`Slice Parameter Flags <h264_slice_flags>`
+
+.. _h264_slice_flags:
+
+``Slice Parameter Set Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_H264_SLICE_FLAG_FIELD_PIC``
+ - 0x00000001
+ -
+ * - ``V4L2_H264_SLICE_FLAG_BOTTOM_FIELD``
+ - 0x00000002
+ -
+ * - ``V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED``
+ - 0x00000004
+ -
+ * - ``V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH``
+ - 0x00000008
+ -
+
+``Prediction Weight Table``
+
+ Unless there's a specific comment, refer to the specification for
+ the documentation of these fields, section 7.4.3.2 "Prediction
+ Weight Table Semantics".
+
+.. c:type:: v4l2_h264_pred_weight_table
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_h264_pred_weight_table
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u16
+ - ``luma_log2_weight_denom``
+ -
+ * - __u16
+ - ``chroma_log2_weight_denom``
+ -
+ * - struct :c:type:`v4l2_h264_weight_factors`
+ - ``weight_factors[2]``
+ - The weight factors at index 0 are the weight factors for the reference
+ list 0, the one at index 1 for the reference list 1.
+
+.. c:type:: v4l2_h264_weight_factors
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_h264_weight_factors
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __s8
+ - ``luma_weight[32]``
+ -
+ * - __s8
+ - ``luma_offset[32]``
+ -
+ * - __s8
+ - ``chroma_weight[32][2]``
+ -
+ * - __s8
+ - ``chroma_offset[32][2]``
+ -
+
+``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (struct)``
+ Specifies the decode parameters (as extracted from the bitstream)
+ for the associated H264 slice data. This includes the necessary
+ parameters for configuring a stateless hardware decoding pipeline
+ for H264. The bitstream parameters are defined according to
+ :ref:`h264`. Unless there's a specific comment, refer to the
+ specification for the documentation of these fields.
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_h264_decode_param
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_h264_decode_param
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``num_slices``
+ - Number of slices needed to decode the current frame
+ * - __u16
+ - ``idr_pic_flag``
+ - Is the picture an IDR picture?
+ * - __u16
+ - ``nal_ref_idc``
+ - NAL reference ID value coming from the NAL Unit header
+ * - __u8
+ - ``ref_pic_list_p0[32]``
+ - Backward reference list used by P-frames in the original bitstream order
+ * - __u8
+ - ``ref_pic_list_b0[32]``
+ - Backward reference list used by B-frames in the original bitstream order
+ * - __u8
+ - ``ref_pic_list_b1[32]``
+ - Forward reference list used by B-frames in the original bitstream order
+ * - __s32
+ - ``top_field_order_cnt``
+ - Picture Order Count for the coded top field
+ * - __s32
+ - ``bottom_field_order_cnt``
+ - Picture Order Count for the coded bottom field
+ * - struct :c:type:`v4l2_h264_dpb_entry`
+ - ``dpb[16]``
+ -
+
+.. c:type:: v4l2_h264_dpb_entry
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_h264_dpb_entry
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u32
+ - ``timestamp``
+ - Timestamp of the V4L2 capture buffer to use as reference, used
+ with B-coded and P-coded frames. The timestamp refers to the
+ ``timestamp`` field in struct :c:type:`v4l2_buffer`. Use the
+ :c:func:`v4l2_timeval_to_ns()` function to convert the struct
+ :c:type:`timeval` in struct :c:type:`v4l2_buffer` to a __u64.
+ * - __u16
+ - ``frame_num``
+ -
+ * - __u16
+ - ``pic_num``
+ -
+ * - __s32
+ - ``top_field_order_cnt``
+ -
+ * - __s32
+ - ``bottom_field_order_cnt``
+ -
+ * - __u32
+ - ``flags``
+ - See :ref:`DPB Entry Flags <h264_dpb_flags>`
+
+.. _h264_dpb_flags:
+
+``DPB Entries Flags``
+
+.. cssclass:: longtable
+
+.. flat-table::
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - ``V4L2_H264_DPB_ENTRY_FLAG_VALID``
+ - 0x00000001
+ - The DPB entry is valid and should be considered
+ * - ``V4L2_H264_DPB_ENTRY_FLAG_ACTIVE``
+ - 0x00000002
+ - The DPB entry is currently being used as a reference frame
+ * - ``V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM``
+ - 0x00000004
+ - The DPB entry is a long term reference frame
+
MFC 5.1 MPEG Controls
---------------------
diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index 2675bef3eefe..b6f857ac1a8e 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -52,6 +52,26 @@ Compressed Formats
- ``V4L2_PIX_FMT_H264_MVC``
- 'M264'
- H264 MVC video elementary stream.
+ * .. _V4L2-PIX-FMT-H264-SLICE:
+
+ - ``V4L2_PIX_FMT_H264_SLICE``
+ - 'S264'
+ - H264 parsed slice data, as extracted from the H264 bitstream.
+ This format is adapted for stateless video decoders that
+ implement an H264 pipeline (using the :ref:`codec` and
+ :ref:`media-request-api`). Metadata associated with the frame
+ to decode are required to be passed through the
+ ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
+ ``V4L2_CID_MPEG_VIDEO_H264_PPS``,
+ ``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
+ ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls and
+ scaling matrices can optionally be specified through the
+ ``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX`` control. See the
+ :ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.
+ Exactly one output and one capture buffer must be provided for
+ use with this pixel format. The output buffer must contain the
+ appropriate number of macroblocks to decode a full
+ corresponding frame to the matching capture buffer.
* .. _V4L2-PIX-FMT-H263:
- ``V4L2_PIX_FMT_H263``
diff --git a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
index f824162d0ea9..bf29dc5b9758 100644
--- a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
+++ b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
@@ -443,6 +443,36 @@ See also the examples in :ref:`control`.
- n/a
- A struct :c:type:`v4l2_ctrl_mpeg2_quantization`, containing MPEG-2
quantization matrices for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_H264_SPS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_h264_sps`, containing H264
+ sequence parameters for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_H264_PPS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_h264_pps`, containing H264
+ picture parameters for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_H264_SCALING_MATRIX``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_h264_scaling_matrix`, containing H264
+ scaling matrices for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_H264_SLICE_PARAMS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_h264_slice_param`, containing H264
+ slice parameters for stateless video decoders.
+ * - ``V4L2_CTRL_TYPE_H264_DECODE_PARAMS``
+ - n/a
+ - n/a
+ - n/a
+ - A struct :c:type:`v4l2_ctrl_h264_decode_param`, containing H264
+ decode parameters for stateless video decoders.
.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
diff --git a/Documentation/media/videodev2.h.rst.exceptions b/Documentation/media/videodev2.h.rst.exceptions
index 64d348e67df9..55cbe324b9fc 100644
--- a/Documentation/media/videodev2.h.rst.exceptions
+++ b/Documentation/media/videodev2.h.rst.exceptions
@@ -136,6 +136,11 @@ replace symbol V4L2_CTRL_TYPE_U32 :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_U8 :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
replace symbol V4L2_CTRL_TYPE_MPEG2_QUANTIZATION :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_H264_SPS :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_H264_PPS :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_H264_SCALING_MATRIX :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_H264_SLICE_PARAMS :c:type:`v4l2_ctrl_type`
+replace symbol V4L2_CTRL_TYPE_H264_DECODE_PARAMS :c:type:`v4l2_ctrl_type`
# V4L2 capability defines
replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 99308dac2daa..366200d31bc0 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -828,6 +828,11 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION:
return "H264 Constrained Intra Pred";
case V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET: return "H264 Chroma QP Index Offset";
+ case V4L2_CID_MPEG_VIDEO_H264_SPS: return "H264 Sequence Parameter Set";
+ case V4L2_CID_MPEG_VIDEO_H264_PPS: return "H264 Picture Parameter Set";
+ case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX: return "H264 Scaling Matrix";
+ case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS: return "H264 Slice Parameters";
+ case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP: return "MPEG4 P-Frame QP Value";
case V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP: return "MPEG4 B-Frame QP Value";
@@ -1303,6 +1308,21 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
*type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
break;
+ case V4L2_CID_MPEG_VIDEO_H264_SPS:
+ *type = V4L2_CTRL_TYPE_H264_SPS;
+ break;
+ case V4L2_CID_MPEG_VIDEO_H264_PPS:
+ *type = V4L2_CTRL_TYPE_H264_PPS;
+ break;
+ case V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX:
+ *type = V4L2_CTRL_TYPE_H264_SCALING_MATRIX;
+ break;
+ case V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS:
+ *type = V4L2_CTRL_TYPE_H264_SLICE_PARAMS;
+ break;
+ case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
+ *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
+ break;
default:
*type = V4L2_CTRL_TYPE_INTEGER;
break;
@@ -1669,6 +1689,13 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
return 0;
+ case V4L2_CTRL_TYPE_H264_SPS:
+ case V4L2_CTRL_TYPE_H264_PPS:
+ case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
+ case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
+ case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
+ return 0;
+
default:
return -EINVAL;
}
@@ -2249,6 +2276,21 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
elem_size = sizeof(struct v4l2_ctrl_mpeg2_quantization);
break;
+ case V4L2_CTRL_TYPE_H264_SPS:
+ elem_size = sizeof(struct v4l2_ctrl_h264_sps);
+ break;
+ case V4L2_CTRL_TYPE_H264_PPS:
+ elem_size = sizeof(struct v4l2_ctrl_h264_pps);
+ break;
+ case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
+ elem_size = sizeof(struct v4l2_ctrl_h264_scaling_matrix);
+ break;
+ case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
+ elem_size = sizeof(struct v4l2_ctrl_h264_slice_param);
+ break;
+ case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
+ elem_size = sizeof(struct v4l2_ctrl_h264_decode_param);
+ break;
default:
if (type < V4L2_CTRL_COMPOUND_TYPES)
elem_size = sizeof(s32);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 206b7348797e..524aed849784 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -1321,6 +1321,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
case V4L2_PIX_FMT_H264: descr = "H.264"; break;
case V4L2_PIX_FMT_H264_NO_SC: descr = "H.264 (No Start Codes)"; break;
case V4L2_PIX_FMT_H264_MVC: descr = "H.264 MVC"; break;
+ case V4L2_PIX_FMT_H264_SLICE: descr = "H.264 Parsed Slice Data"; break;
case V4L2_PIX_FMT_H263: descr = "H.263"; break;
case V4L2_PIX_FMT_MPEG1: descr = "MPEG-1 ES"; break;
case V4L2_PIX_FMT_MPEG2: descr = "MPEG-2 ES"; break;
diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
new file mode 100644
index 000000000000..242a93a67d15
--- /dev/null
+++ b/include/media/h264-ctrls.h
@@ -0,0 +1,190 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * These are the H.264 state controls for use with stateless H.264
+ * codec drivers.
+ *
+ * It turns out that these structs are not stable yet and will undergo
+ * more changes. So keep them private until they are stable and ready to
+ * become part of the official public API.
+ */
+
+#ifndef _H264_CTRLS_H_
+#define _H264_CTRLS_H_
+
+/*
+ * This is put insanely high to avoid conflicting with controls that
+ * would be added during the phase where those controls are not
+ * stable. It should be fixed eventually.
+ */
+#define V4L2_CID_MPEG_VIDEO_H264_SPS (V4L2_CID_MPEG_BASE+1000)
+#define V4L2_CID_MPEG_VIDEO_H264_PPS (V4L2_CID_MPEG_BASE+1001)
+#define V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX (V4L2_CID_MPEG_BASE+1002)
+#define V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (V4L2_CID_MPEG_BASE+1003)
+#define V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (V4L2_CID_MPEG_BASE+1004)
+
+/* enum v4l2_ctrl_type type values */
+#define V4L2_CTRL_TYPE_H264_SPS 0x0105
+#define V4L2_CTRL_TYPE_H264_PPS 0x0106
+#define V4L2_CTRL_TYPE_H264_SCALING_MATRIX 0x0107
+#define V4L2_CTRL_TYPE_H264_SLICE_PARAMS 0x0108
+#define V4L2_CTRL_TYPE_H264_DECODE_PARAMS 0x0109
+
+#define V4L2_H264_SPS_CONSTRAINT_SET0_FLAG 0x01
+#define V4L2_H264_SPS_CONSTRAINT_SET1_FLAG 0x02
+#define V4L2_H264_SPS_CONSTRAINT_SET2_FLAG 0x04
+#define V4L2_H264_SPS_CONSTRAINT_SET3_FLAG 0x08
+#define V4L2_H264_SPS_CONSTRAINT_SET4_FLAG 0x10
+#define V4L2_H264_SPS_CONSTRAINT_SET5_FLAG 0x20
+
+#define V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE 0x01
+#define V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS 0x02
+#define V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO 0x04
+#define V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED 0x08
+#define V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY 0x10
+#define V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD 0x20
+#define V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE 0x40
+
+struct v4l2_ctrl_h264_sps {
+ __u8 profile_idc;
+ __u8 constraint_set_flags;
+ __u8 level_idc;
+ __u8 seq_parameter_set_id;
+ __u8 chroma_format_idc;
+ __u8 bit_depth_luma_minus8;
+ __u8 bit_depth_chroma_minus8;
+ __u8 log2_max_frame_num_minus4;
+ __u8 pic_order_cnt_type;
+ __u8 log2_max_pic_order_cnt_lsb_minus4;
+ __u8 max_num_ref_frames;
+ __u8 num_ref_frames_in_pic_order_cnt_cycle;
+ __s32 offset_for_ref_frame[255];
+ __s32 offset_for_non_ref_pic;
+ __s32 offset_for_top_to_bottom_field;
+ __u16 pic_width_in_mbs_minus1;
+ __u16 pic_height_in_map_units_minus1;
+ __u32 flags;
+};
+
+#define V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE 0x0001
+#define V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT 0x0002
+#define V4L2_H264_PPS_FLAG_WEIGHTED_PRED 0x0004
+#define V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT 0x0008
+#define V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED 0x0010
+#define V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT 0x0020
+#define V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE 0x0040
+#define V4L2_H264_PPS_FLAG_PIC_SCALING_MATRIX_PRESENT 0x0080
+
+struct v4l2_ctrl_h264_pps {
+ __u8 pic_parameter_set_id;
+ __u8 seq_parameter_set_id;
+ __u8 num_slice_groups_minus1;
+ __u8 num_ref_idx_l0_default_active_minus1;
+ __u8 num_ref_idx_l1_default_active_minus1;
+ __u8 weighted_bipred_idc;
+ __s8 pic_init_qp_minus26;
+ __s8 pic_init_qs_minus26;
+ __s8 chroma_qp_index_offset;
+ __s8 second_chroma_qp_index_offset;
+ __u16 flags;
+};
+
+struct v4l2_ctrl_h264_scaling_matrix {
+ __u8 scaling_list_4x4[6][16];
+ __u8 scaling_list_8x8[6][64];
+};
+
+struct v4l2_h264_weight_factors {
+ __s8 luma_weight[32];
+ __s8 luma_offset[32];
+ __s8 chroma_weight[32][2];
+ __s8 chroma_offset[32][2];
+};
+
+struct v4l2_h264_pred_weight_table {
+ __u16 luma_log2_weight_denom;
+ __u16 chroma_log2_weight_denom;
+ struct v4l2_h264_weight_factors weight_factors[2];
+};
+
+#define V4L2_H264_SLICE_TYPE_P 0
+#define V4L2_H264_SLICE_TYPE_B 1
+#define V4L2_H264_SLICE_TYPE_I 2
+#define V4L2_H264_SLICE_TYPE_SP 3
+#define V4L2_H264_SLICE_TYPE_SI 4
+
+#define V4L2_H264_SLICE_FLAG_FIELD_PIC 0x01
+#define V4L2_H264_SLICE_FLAG_BOTTOM_FIELD 0x02
+#define V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED 0x04
+#define V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH 0x08
+
+struct v4l2_ctrl_h264_slice_param {
+ /* Size in bytes, including header */
+ __u32 size;
+ /* Offset in bits to slice_data() from the beginning of this slice. */
+ __u32 header_bit_size;
+
+ __u16 first_mb_in_slice;
+ __u8 slice_type;
+ __u8 pic_parameter_set_id;
+ __u8 colour_plane_id;
+ __u8 redundant_pic_cnt;
+ __u16 frame_num;
+ __u16 idr_pic_id;
+ __u16 pic_order_cnt_lsb;
+ __s32 delta_pic_order_cnt_bottom;
+ __s32 delta_pic_order_cnt0;
+ __s32 delta_pic_order_cnt1;
+
+ struct v4l2_h264_pred_weight_table pred_weight_table;
+ /* Size in bits of dec_ref_pic_marking() syntax element. */
+ __u32 dec_ref_pic_marking_bit_size;
+ /* Size in bits of pic order count syntax. */
+ __u32 pic_order_cnt_bit_size;
+
+ __u8 cabac_init_idc;
+ __s8 slice_qp_delta;
+ __s8 slice_qs_delta;
+ __u8 disable_deblocking_filter_idc;
+ __s8 slice_alpha_c0_offset_div2;
+ __s8 slice_beta_offset_div2;
+ __u8 num_ref_idx_l0_active_minus1;
+ __u8 num_ref_idx_l1_active_minus1;
+ __u32 slice_group_change_cycle;
+
+ /*
+ * Entries on each list are indices into
+ * v4l2_ctrl_h264_decode_param.dpb[].
+ */
+ __u8 ref_pic_list0[32];
+ __u8 ref_pic_list1[32];
+
+ __u32 flags;
+};
+
+#define V4L2_H264_DPB_ENTRY_FLAG_VALID 0x01
+#define V4L2_H264_DPB_ENTRY_FLAG_ACTIVE 0x02
+#define V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM 0x04
+
+struct v4l2_h264_dpb_entry {
+ __u64 timestamp;
+ __u16 frame_num;
+ __u16 pic_num;
+ /* Note that field is indicated by v4l2_buffer.field */
+ __s32 top_field_order_cnt;
+ __s32 bottom_field_order_cnt;
+ __u32 flags; /* V4L2_H264_DPB_ENTRY_FLAG_* */
+};
+
+struct v4l2_ctrl_h264_decode_param {
+ __u32 num_slices;
+ __u16 idr_pic_flag;
+ __u16 nal_ref_idc;
+ __u8 ref_pic_list_p0[32];
+ __u8 ref_pic_list_b0[32];
+ __u8 ref_pic_list_b1[32];
+ __s32 top_field_order_cnt;
+ __s32 bottom_field_order_cnt;
+ struct v4l2_h264_dpb_entry dpb[16];
+};
+
+#endif
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index d63cf227b0ab..22b6d09c4764 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -23,10 +23,11 @@
#include <media/media-request.h>
/*
- * Include the mpeg2 stateless codec compound control definitions.
+ * Include the stateless codec compound control definitions.
* This will move to the public headers once this API is fully stable.
*/
#include <media/mpeg2-ctrls.h>
+#include <media/h264-ctrls.h>
/* forward references */
struct file;
@@ -49,6 +50,11 @@ struct poll_table_struct;
* @p_char: Pointer to a string.
* @p_mpeg2_slice_params: Pointer to a MPEG2 slice parameters structure.
* @p_mpeg2_quantization: Pointer to a MPEG2 quantization data structure.
+ * @p_h264_sps: Pointer to a struct v4l2_ctrl_h264_sps.
+ * @p_h264_pps: Pointer to a struct v4l2_ctrl_h264_pps.
+ * @p_h264_scaling_matrix: Pointer to a struct v4l2_ctrl_h264_scaling_matrix.
+ * @p_h264_slice_param: Pointer to a struct v4l2_ctrl_h264_slice_param.
+ * @p_h264_decode_param: Pointer to a struct v4l2_ctrl_h264_decode_param.
* @p: Pointer to a compound value.
*/
union v4l2_ctrl_ptr {
@@ -60,6 +66,11 @@ union v4l2_ctrl_ptr {
char *p_char;
struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
struct v4l2_ctrl_mpeg2_quantization *p_mpeg2_quantization;
+ struct v4l2_ctrl_h264_sps *p_h264_sps;
+ struct v4l2_ctrl_h264_pps *p_h264_pps;
+ struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix;
+ struct v4l2_ctrl_h264_slice_param *p_h264_slice_param;
+ struct v4l2_ctrl_h264_decode_param *p_h264_decode_param;
void *p;
};
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 9a920f071ff9..6443ae53597f 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -653,6 +653,7 @@ struct v4l2_pix_format {
#define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
#define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
#define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
+#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
#define V4L2_PIX_FMT_H263 v4l2_fourcc('H', '2', '6', '3') /* H263 */
#define V4L2_PIX_FMT_MPEG1 v4l2_fourcc('M', 'P', 'G', '1') /* MPEG-1 ES */
#define V4L2_PIX_FMT_MPEG2 v4l2_fourcc('M', 'P', 'G', '2') /* MPEG-2 ES */
--
git-series 0.9.1
Hi Maxime,
On Wed, Feb 20, 2019 at 11:17 PM Maxime Ripard
<[email protected]> wrote:
>
> From: Pawel Osciak <[email protected]>
>
> Stateless video codecs will require both the H264 metadata and slices in
> order to be able to decode frames.
>
> This introduces the definitions for a new pixel format for H264 slices that
> have been parsed, as well as the structures used to pass the metadata from
> the userspace to the kernel.
>
> Co-Developped-by: Maxime Ripard <[email protected]>
> Signed-off-by: Pawel Osciak <[email protected]>
> Signed-off-by: Guenter Roeck <[email protected]>
> Signed-off-by: Maxime Ripard <[email protected]>
Thanks for the patch. Some comments inline.
[snip]
> +``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
> + Specifies the slice parameters (as extracted from the bitstream)
> + for the associated H264 slice data. This includes the necessary
> + parameters for configuring a stateless hardware decoding pipeline
> + for H264. The bitstream parameters are defined according to
> + :ref:`h264`. Unless there's a specific comment, refer to the
> + specification for the documentation of these fields, section 7.4.3
> + "Slice Header Semantics".
Note that this is expected to be an array, with entries for all the
slices included in the bitstream buffer.
> +
> + .. note::
> +
> + This compound control is not yet part of the public kernel API and
> + it is expected to change.
> +
> +.. c:type:: v4l2_ctrl_h264_slice_param
> +
> +.. cssclass:: longtable
> +
> +.. flat-table:: struct v4l2_ctrl_h264_slice_param
> + :header-rows: 0
> + :stub-columns: 0
> + :widths: 1 1 2
> +
> + * - __u32
> + - ``size``
> + -
> + * - __u32
> + - ``header_bit_size``
> + -
> + * - __u16
> + - ``first_mb_in_slice``
> + -
> + * - __u8
> + - ``slice_type``
> + -
> + * - __u8
> + - ``pic_parameter_set_id``
> + -
> + * - __u8
> + - ``colour_plane_id``
> + -
> + * - __u8
> + - ``redundant_pic_cnt``
> + -
> + * - __u16
> + - ``frame_num``
> + -
> + * - __u16
> + - ``idr_pic_id``
> + -
> + * - __u16
> + - ``pic_order_cnt_lsb``
> + -
> + * - __s32
> + - ``delta_pic_order_cnt_bottom``
> + -
> + * - __s32
> + - ``delta_pic_order_cnt0``
> + -
> + * - __s32
> + - ``delta_pic_order_cnt1``
> + -
> + * - struct :c:type:`v4l2_h264_pred_weight_table`
> + - ``pred_weight_table``
> + -
> + * - __u32
> + - ``dec_ref_pic_marking_bit_size``
> + -
> + * - __u32
> + - ``pic_order_cnt_bit_size``
> + -
> + * - __u8
> + - ``cabac_init_idc``
> + -
> + * - __s8
> + - ``slice_qp_delta``
> + -
> + * - __s8
> + - ``slice_qs_delta``
> + -
> + * - __u8
> + - ``disable_deblocking_filter_idc``
> + -
> + * - __s8
> + - ``slice_alpha_c0_offset_div2``
> + -
> + * - __s8
> + - ``slice_beta_offset_div2``
> + -
> + * - __u8
> + - ``num_ref_idx_l0_active_minus1``
> + -
> + * - __u8
> + - ``num_ref_idx_l1_active_minus1``
> + -
> + * - __u32
> + - ``slice_group_change_cycle``
> + -
> + * - __u8
> + - ``ref_pic_list0[32]``
> + -
> + * - __u8
> + - ``ref_pic_list1[32]``
> + -
Should we explicitly document that these are the lists after applying
the per-slice modifications, as opposed to the original order from
v4l2_ctrl_h264_decode_param?
[snip]
> + * .. _V4L2-PIX-FMT-H264-SLICE:
> +
> + - ``V4L2_PIX_FMT_H264_SLICE``
> + - 'S264'
> + - H264 parsed slice data, as extracted from the H264 bitstream.
> + This format is adapted for stateless video decoders that
> + implement an H264 pipeline (using the :ref:`codec` and
> + :ref:`media-request-api`). Metadata associated with the frame
> + to decode are required to be passed through the
> + ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
> + ``V4L2_CID_MPEG_VIDEO_H264_PPS``,
> + ``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
> + ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls and
> + scaling matrices can optionally be specified through the
> + ``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX`` control. See the
> + :ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.
> + Exactly one output and one capture buffer must be provided for
> + use with this pixel format. The output buffer must contain the
> + appropriate number of macroblocks to decode a full
> + corresponding frame to the matching capture buffer.
What does it mean that a control can be optionally specified? A
control always has a value, so how do we decide that it was specified
or not? Should we have another control (or flag) that selects whether
to use the control? How is it better than just having the control
initialized with the default scaling matrix and always using it?
[snip]
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 9a920f071ff9..6443ae53597f 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -653,6 +653,7 @@ struct v4l2_pix_format {
> #define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
Are we okay with adding here already, without going through staging first?
Best regards,
Tomasz
On Fri, 2019-02-22 at 16:46 +0900, Tomasz Figa wrote:
> Hi Maxime,
>
> On Wed, Feb 20, 2019 at 11:17 PM Maxime Ripard
> <[email protected]> wrote:
> > From: Pawel Osciak <[email protected]>
> >
> > Stateless video codecs will require both the H264 metadata and slices in
> > order to be able to decode frames.
> >
> > This introduces the definitions for a new pixel format for H264 slices that
> > have been parsed, as well as the structures used to pass the metadata from
> > the userspace to the kernel.
> >
> > Co-Developped-by: Maxime Ripard <[email protected]>
> > Signed-off-by: Pawel Osciak <[email protected]>
> > Signed-off-by: Guenter Roeck <[email protected]>
> > Signed-off-by: Maxime Ripard <[email protected]>
>
> Thanks for the patch. Some comments inline.
>
> [snip]
> > +``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
> > + Specifies the slice parameters (as extracted from the bitstream)
> > + for the associated H264 slice data. This includes the necessary
> > + parameters for configuring a stateless hardware decoding pipeline
> > + for H264. The bitstream parameters are defined according to
> > + :ref:`h264`. Unless there's a specific comment, refer to the
> > + specification for the documentation of these fields, section 7.4.3
> > + "Slice Header Semantics".
>
> Note that this is expected to be an array, with entries for all the
> slices included in the bitstream buffer.
>
> > +
> > + .. note::
> > +
> > + This compound control is not yet part of the public kernel API and
> > + it is expected to change.
> > +
> > +.. c:type:: v4l2_ctrl_h264_slice_param
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_ctrl_h264_slice_param
> > + :header-rows: 0
> > + :stub-columns: 0
> > + :widths: 1 1 2
> > +
> > + * - __u32
> > + - ``size``
> > + -
> > + * - __u32
> > + - ``header_bit_size``
> > + -
> > + * - __u16
> > + - ``first_mb_in_slice``
> > + -
> > + * - __u8
> > + - ``slice_type``
> > + -
> > + * - __u8
> > + - ``pic_parameter_set_id``
> > + -
> > + * - __u8
> > + - ``colour_plane_id``
> > + -
> > + * - __u8
> > + - ``redundant_pic_cnt``
> > + -
> > + * - __u16
> > + - ``frame_num``
> > + -
> > + * - __u16
> > + - ``idr_pic_id``
> > + -
> > + * - __u16
> > + - ``pic_order_cnt_lsb``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt_bottom``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt0``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt1``
> > + -
> > + * - struct :c:type:`v4l2_h264_pred_weight_table`
> > + - ``pred_weight_table``
> > + -
> > + * - __u32
> > + - ``dec_ref_pic_marking_bit_size``
> > + -
> > + * - __u32
> > + - ``pic_order_cnt_bit_size``
> > + -
> > + * - __u8
> > + - ``cabac_init_idc``
> > + -
> > + * - __s8
> > + - ``slice_qp_delta``
> > + -
> > + * - __s8
> > + - ``slice_qs_delta``
> > + -
> > + * - __u8
> > + - ``disable_deblocking_filter_idc``
> > + -
> > + * - __s8
> > + - ``slice_alpha_c0_offset_div2``
> > + -
> > + * - __s8
> > + - ``slice_beta_offset_div2``
> > + -
> > + * - __u8
> > + - ``num_ref_idx_l0_active_minus1``
> > + -
> > + * - __u8
> > + - ``num_ref_idx_l1_active_minus1``
> > + -
> > + * - __u32
> > + - ``slice_group_change_cycle``
> > + -
> > + * - __u8
> > + - ``ref_pic_list0[32]``
> > + -
> > + * - __u8
> > + - ``ref_pic_list1[32]``
> > + -
>
> Should we explicitly document that these are the lists after applying
> the per-slice modifications, as opposed to the original order from
> v4l2_ctrl_h264_decode_param?
>
> [snip]
> > + * .. _V4L2-PIX-FMT-H264-SLICE:
> > +
> > + - ``V4L2_PIX_FMT_H264_SLICE``
> > + - 'S264'
> > + - H264 parsed slice data, as extracted from the H264 bitstream.
> > + This format is adapted for stateless video decoders that
> > + implement an H264 pipeline (using the :ref:`codec` and
> > + :ref:`media-request-api`). Metadata associated with the frame
> > + to decode are required to be passed through the
> > + ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
> > + ``V4L2_CID_MPEG_VIDEO_H264_PPS``,
> > + ``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
> > + ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls and
> > + scaling matrices can optionally be specified through the
> > + ``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX`` control. See the
> > + :ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.
> > + Exactly one output and one capture buffer must be provided for
> > + use with this pixel format. The output buffer must contain the
> > + appropriate number of macroblocks to decode a full
> > + corresponding frame to the matching capture buffer.
>
> What does it mean that a control can be optionally specified? A
> control always has a value, so how do we decide that it was specified
> or not? Should we have another control (or flag) that selects whether
> to use the control? How is it better than just having the control
> initialized with the default scaling matrix and always using it?
>
> [snip]
>
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 9a920f071ff9..6443ae53597f 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -653,6 +653,7 @@ struct v4l2_pix_format {
> > #define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> > #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> > #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
>
> Are we okay with adding here already, without going through staging first?
>
>
Also regarding the pixel formats. I still think we should have two pixel formats:
V4L2_PIX_FMT_H264_SLICE_RAW and V4L2_PIX_FMT_H264_SLICE_ANNEX_B, to properly
represent "raw" NALUs and "annex B" formatted NALUs.
Thanks,
Eze
Hi Ezequiel,
On Fri, Feb 22, 2019 at 01:59:33PM -0300, Ezequiel Garcia wrote:
> On Fri, 2019-02-22 at 16:46 +0900, Tomasz Figa wrote:
> > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > > index 9a920f071ff9..6443ae53597f 100644
> > > --- a/include/uapi/linux/videodev2.h
> > > +++ b/include/uapi/linux/videodev2.h
> > > @@ -653,6 +653,7 @@ struct v4l2_pix_format {
> > > #define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> > > #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> > > #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> > > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> >
> > Are we okay with adding here already, without going through staging first?
>
> Also regarding the pixel formats. I still think we should have two
> pixel formats: V4L2_PIX_FMT_H264_SLICE_RAW and
> V4L2_PIX_FMT_H264_SLICE_ANNEX_B, to properly represent "raw" NALUs
> and "annex B" formatted NALUs.
I agree with that, but I was under the impression that it would be
part of your series, since you would be the prime user (at first at
least).
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
Le mercredi 27 février 2019 à 11:01 +0100, Maxime Ripard a écrit :
> > Also regarding the pixel formats. I still think we should have two
> > pixel formats: V4L2_PIX_FMT_H264_SLICE_RAW and
> > V4L2_PIX_FMT_H264_SLICE_ANNEX_B, to properly represent "raw" NALUs
> > and "annex B" formatted NALUs.
>
> I agree with that, but I was under the impression that it would be
> part of your series, since you would be the prime user (at first at
> least).
Notice that Ezequiel is requesting a rename of V4L2_PIX_FMT_H264_SLICE
to V4L2_PIX_FMT_H264_SLICE_RAW, which is being added in this serie.
Nicolas
On Wed, 2019-02-20 at 15:17 +0100, Maxime Ripard wrote:
> From: Pawel Osciak <[email protected]>
>
> Stateless video codecs will require both the H264 metadata and slices in
> order to be able to decode frames.
>
> This introduces the definitions for a new pixel format for H264 slices that
> have been parsed, as well as the structures used to pass the metadata from
> the userspace to the kernel.
>
> Co-Developped-by: Maxime Ripard <[email protected]>
> Signed-off-by: Pawel Osciak <[email protected]>
> Signed-off-by: Guenter Roeck <[email protected]>
> Signed-off-by: Maxime Ripard <[email protected]>
> ---
> Documentation/media/uapi/v4l/biblio.rst | 9 +-
> Documentation/media/uapi/v4l/extended-controls.rst | 547 ++++++++++++++-
It seems Hans splitted the documentation and so this should now
go to Documentation/media/uapi/v4l/ext-ctrls-codec.rst.
[..]
>
> +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> #define V4L2_PIX_FMT_H263 v4l2_fourcc('H', '2', '6', '3') /* H263 */
> #define V4L2_PIX_FMT_MPEG1 v4l2_fourcc('M', 'P', 'G', '1') /* MPEG-1 ES */
> #define V4L2_PIX_FMT_MPEG2 v4l2_fourcc('M', 'P', 'G', '2') /* MPEG-2 ES */
I haven't seen any objections to renaming this to V4L2_PIX_FMT_H264_SLICE_RAW,
so if you could be so kind to push v5 with this rename (or similar), and also
rebasing to the master branch, I could then submit the H264 decoder support for
the Rockchip VPU.
There is still the question brought up by Tomasz, about moving this pixel format
to a non-public header. Perhaps someone has some ideas on this?
Thanks a lot!
Ezequiel
Hi,
On Mon, Mar 04, 2019 at 03:49:11PM -0300, Ezequiel Garcia wrote:
> On Wed, 2019-02-20 at 15:17 +0100, Maxime Ripard wrote:
> > From: Pawel Osciak <[email protected]>
> >
> > Stateless video codecs will require both the H264 metadata and slices in
> > order to be able to decode frames.
> >
> > This introduces the definitions for a new pixel format for H264 slices that
> > have been parsed, as well as the structures used to pass the metadata from
> > the userspace to the kernel.
> >
> > Co-Developped-by: Maxime Ripard <[email protected]>
> > Signed-off-by: Pawel Osciak <[email protected]>
> > Signed-off-by: Guenter Roeck <[email protected]>
> > Signed-off-by: Maxime Ripard <[email protected]>
> > ---
> > Documentation/media/uapi/v4l/biblio.rst | 9 +-
> > Documentation/media/uapi/v4l/extended-controls.rst | 547 ++++++++++++++-
>
> It seems Hans splitted the documentation and so this should now
> go to Documentation/media/uapi/v4l/ext-ctrls-codec.rst.
Thanks for letting me know, it will be fixed in the next version.
> >
> > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> > #define V4L2_PIX_FMT_H263 v4l2_fourcc('H', '2', '6', '3') /* H263 */
> > #define V4L2_PIX_FMT_MPEG1 v4l2_fourcc('M', 'P', 'G', '1') /* MPEG-1 ES */
> > #define V4L2_PIX_FMT_MPEG2 v4l2_fourcc('M', 'P', 'G', '2') /* MPEG-2 ES */
>
> I haven't seen any objections to renaming this to V4L2_PIX_FMT_H264_SLICE_RAW,
> so if you could be so kind to push v5 with this rename (or similar), and also
> rebasing to the master branch, I could then submit the H264 decoder support for
> the Rockchip VPU.
I don't remember it, but yeah, this is fine by me. I'll adjust it and
send a new version.
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
On Fri, Feb 22, 2019 at 04:46:17PM +0900, Tomasz Figa wrote:
> Hi Maxime,
>
> On Wed, Feb 20, 2019 at 11:17 PM Maxime Ripard
> <[email protected]> wrote:
> >
> > From: Pawel Osciak <[email protected]>
> >
> > Stateless video codecs will require both the H264 metadata and slices in
> > order to be able to decode frames.
> >
> > This introduces the definitions for a new pixel format for H264 slices that
> > have been parsed, as well as the structures used to pass the metadata from
> > the userspace to the kernel.
> >
> > Co-Developped-by: Maxime Ripard <[email protected]>
> > Signed-off-by: Pawel Osciak <[email protected]>
> > Signed-off-by: Guenter Roeck <[email protected]>
> > Signed-off-by: Maxime Ripard <[email protected]>
>
> Thanks for the patch. Some comments inline.
>
> [snip]
> > +``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
> > + Specifies the slice parameters (as extracted from the bitstream)
> > + for the associated H264 slice data. This includes the necessary
> > + parameters for configuring a stateless hardware decoding pipeline
> > + for H264. The bitstream parameters are defined according to
> > + :ref:`h264`. Unless there's a specific comment, refer to the
> > + specification for the documentation of these fields, section 7.4.3
> > + "Slice Header Semantics".
>
> Note that this is expected to be an array, with entries for all the
> slices included in the bitstream buffer.
>
> > +
> > + .. note::
> > +
> > + This compound control is not yet part of the public kernel API and
> > + it is expected to change.
> > +
> > +.. c:type:: v4l2_ctrl_h264_slice_param
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_ctrl_h264_slice_param
> > + :header-rows: 0
> > + :stub-columns: 0
> > + :widths: 1 1 2
> > +
> > + * - __u32
> > + - ``size``
> > + -
> > + * - __u32
> > + - ``header_bit_size``
> > + -
> > + * - __u16
> > + - ``first_mb_in_slice``
> > + -
> > + * - __u8
> > + - ``slice_type``
> > + -
> > + * - __u8
> > + - ``pic_parameter_set_id``
> > + -
> > + * - __u8
> > + - ``colour_plane_id``
> > + -
> > + * - __u8
> > + - ``redundant_pic_cnt``
> > + -
> > + * - __u16
> > + - ``frame_num``
> > + -
> > + * - __u16
> > + - ``idr_pic_id``
> > + -
> > + * - __u16
> > + - ``pic_order_cnt_lsb``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt_bottom``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt0``
> > + -
> > + * - __s32
> > + - ``delta_pic_order_cnt1``
> > + -
> > + * - struct :c:type:`v4l2_h264_pred_weight_table`
> > + - ``pred_weight_table``
> > + -
> > + * - __u32
> > + - ``dec_ref_pic_marking_bit_size``
> > + -
> > + * - __u32
> > + - ``pic_order_cnt_bit_size``
> > + -
> > + * - __u8
> > + - ``cabac_init_idc``
> > + -
> > + * - __s8
> > + - ``slice_qp_delta``
> > + -
> > + * - __s8
> > + - ``slice_qs_delta``
> > + -
> > + * - __u8
> > + - ``disable_deblocking_filter_idc``
> > + -
> > + * - __s8
> > + - ``slice_alpha_c0_offset_div2``
> > + -
> > + * - __s8
> > + - ``slice_beta_offset_div2``
> > + -
> > + * - __u8
> > + - ``num_ref_idx_l0_active_minus1``
> > + -
> > + * - __u8
> > + - ``num_ref_idx_l1_active_minus1``
> > + -
> > + * - __u32
> > + - ``slice_group_change_cycle``
> > + -
> > + * - __u8
> > + - ``ref_pic_list0[32]``
> > + -
> > + * - __u8
> > + - ``ref_pic_list1[32]``
> > + -
>
> Should we explicitly document that these are the lists after applying
> the per-slice modifications, as opposed to the original order from
> v4l2_ctrl_h264_decode_param?
>
> [snip]
> > + * .. _V4L2-PIX-FMT-H264-SLICE:
> > +
> > + - ``V4L2_PIX_FMT_H264_SLICE``
> > + - 'S264'
> > + - H264 parsed slice data, as extracted from the H264 bitstream.
> > + This format is adapted for stateless video decoders that
> > + implement an H264 pipeline (using the :ref:`codec` and
> > + :ref:`media-request-api`). Metadata associated with the frame
> > + to decode are required to be passed through the
> > + ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
> > + ``V4L2_CID_MPEG_VIDEO_H264_PPS``,
> > + ``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
> > + ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls and
> > + scaling matrices can optionally be specified through the
> > + ``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX`` control. See the
> > + :ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.
> > + Exactly one output and one capture buffer must be provided for
> > + use with this pixel format. The output buffer must contain the
> > + appropriate number of macroblocks to decode a full
> > + corresponding frame to the matching capture buffer.
>
> What does it mean that a control can be optionally specified? A
> control always has a value, so how do we decide that it was specified
> or not? Should we have another control (or flag) that selects whether
> to use the control? How is it better than just having the control
> initialized with the default scaling matrix and always using it?
Ok, I'll change it.
> > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > index 9a920f071ff9..6443ae53597f 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -653,6 +653,7 @@ struct v4l2_pix_format {
> > #define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> > #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> > #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
>
> Are we okay with adding here already, without going through staging first?
This is what we did for MPEG-2 already (the format is public but the
controls are not), so I'm not sure this is causing any issue.
Thanks!
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
On Tue, 2019-03-05 at 12:16 +0100, Maxime Ripard wrote:
> On Fri, Feb 22, 2019 at 04:46:17PM +0900, Tomasz Figa wrote:
> > Hi Maxime,
> >
> > On Wed, Feb 20, 2019 at 11:17 PM Maxime Ripard
> > <[email protected]> wrote:
> > > From: Pawel Osciak <[email protected]>
> > >
> > > Stateless video codecs will require both the H264 metadata and slices in
> > > order to be able to decode frames.
> > >
> > > This introduces the definitions for a new pixel format for H264 slices that
> > > have been parsed, as well as the structures used to pass the metadata from
> > > the userspace to the kernel.
> > >
> > > Co-Developped-by: Maxime Ripard <[email protected]>
> > > Signed-off-by: Pawel Osciak <[email protected]>
> > > Signed-off-by: Guenter Roeck <[email protected]>
> > > Signed-off-by: Maxime Ripard <[email protected]>
> >
> > Thanks for the patch. Some comments inline.
> >
> > [snip]
> > > +``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS (struct)``
> > > + Specifies the slice parameters (as extracted from the bitstream)
> > > + for the associated H264 slice data. This includes the necessary
> > > + parameters for configuring a stateless hardware decoding pipeline
> > > + for H264. The bitstream parameters are defined according to
> > > + :ref:`h264`. Unless there's a specific comment, refer to the
> > > + specification for the documentation of these fields, section 7.4.3
> > > + "Slice Header Semantics".
> >
> > Note that this is expected to be an array, with entries for all the
> > slices included in the bitstream buffer.
> >
> > > +
> > > + .. note::
> > > +
> > > + This compound control is not yet part of the public kernel API and
> > > + it is expected to change.
> > > +
> > > +.. c:type:: v4l2_ctrl_h264_slice_param
> > > +
> > > +.. cssclass:: longtable
> > > +
> > > +.. flat-table:: struct v4l2_ctrl_h264_slice_param
> > > + :header-rows: 0
> > > + :stub-columns: 0
> > > + :widths: 1 1 2
> > > +
> > > + * - __u32
> > > + - ``size``
> > > + -
> > > + * - __u32
> > > + - ``header_bit_size``
> > > + -
> > > + * - __u16
> > > + - ``first_mb_in_slice``
> > > + -
> > > + * - __u8
> > > + - ``slice_type``
> > > + -
> > > + * - __u8
> > > + - ``pic_parameter_set_id``
> > > + -
> > > + * - __u8
> > > + - ``colour_plane_id``
> > > + -
> > > + * - __u8
> > > + - ``redundant_pic_cnt``
> > > + -
> > > + * - __u16
> > > + - ``frame_num``
> > > + -
> > > + * - __u16
> > > + - ``idr_pic_id``
> > > + -
> > > + * - __u16
> > > + - ``pic_order_cnt_lsb``
> > > + -
> > > + * - __s32
> > > + - ``delta_pic_order_cnt_bottom``
> > > + -
> > > + * - __s32
> > > + - ``delta_pic_order_cnt0``
> > > + -
> > > + * - __s32
> > > + - ``delta_pic_order_cnt1``
> > > + -
> > > + * - struct :c:type:`v4l2_h264_pred_weight_table`
> > > + - ``pred_weight_table``
> > > + -
> > > + * - __u32
> > > + - ``dec_ref_pic_marking_bit_size``
> > > + -
> > > + * - __u32
> > > + - ``pic_order_cnt_bit_size``
> > > + -
> > > + * - __u8
> > > + - ``cabac_init_idc``
> > > + -
> > > + * - __s8
> > > + - ``slice_qp_delta``
> > > + -
> > > + * - __s8
> > > + - ``slice_qs_delta``
> > > + -
> > > + * - __u8
> > > + - ``disable_deblocking_filter_idc``
> > > + -
> > > + * - __s8
> > > + - ``slice_alpha_c0_offset_div2``
> > > + -
> > > + * - __s8
> > > + - ``slice_beta_offset_div2``
> > > + -
> > > + * - __u8
> > > + - ``num_ref_idx_l0_active_minus1``
> > > + -
> > > + * - __u8
> > > + - ``num_ref_idx_l1_active_minus1``
> > > + -
> > > + * - __u32
> > > + - ``slice_group_change_cycle``
> > > + -
> > > + * - __u8
> > > + - ``ref_pic_list0[32]``
> > > + -
> > > + * - __u8
> > > + - ``ref_pic_list1[32]``
> > > + -
> >
> > Should we explicitly document that these are the lists after applying
> > the per-slice modifications, as opposed to the original order from
> > v4l2_ctrl_h264_decode_param?
> >
> > [snip]
> > > + * .. _V4L2-PIX-FMT-H264-SLICE:
> > > +
> > > + - ``V4L2_PIX_FMT_H264_SLICE``
> > > + - 'S264'
> > > + - H264 parsed slice data, as extracted from the H264 bitstream.
> > > + This format is adapted for stateless video decoders that
> > > + implement an H264 pipeline (using the :ref:`codec` and
> > > + :ref:`media-request-api`). Metadata associated with the frame
> > > + to decode are required to be passed through the
> > > + ``V4L2_CID_MPEG_VIDEO_H264_SPS``,
> > > + ``V4L2_CID_MPEG_VIDEO_H264_PPS``,
> > > + ``V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS`` and
> > > + ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS`` controls and
> > > + scaling matrices can optionally be specified through the
> > > + ``V4L2_CID_MPEG_VIDEO_H264_SCALING_MATRIX`` control. See the
> > > + :ref:`associated Codec Control IDs <v4l2-mpeg-h264>`.
> > > + Exactly one output and one capture buffer must be provided for
> > > + use with this pixel format. The output buffer must contain the
> > > + appropriate number of macroblocks to decode a full
> > > + corresponding frame to the matching capture buffer.
> >
> > What does it mean that a control can be optionally specified? A
> > control always has a value, so how do we decide that it was specified
> > or not? Should we have another control (or flag) that selects whether
> > to use the control? How is it better than just having the control
> > initialized with the default scaling matrix and always using it?
>
> Ok, I'll change it.
>
> > > diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> > > index 9a920f071ff9..6443ae53597f 100644
> > > --- a/include/uapi/linux/videodev2.h
> > > +++ b/include/uapi/linux/videodev2.h
> > > @@ -653,6 +653,7 @@ struct v4l2_pix_format {
> > > #define V4L2_PIX_FMT_H264 v4l2_fourcc('H', '2', '6', '4') /* H264 with start codes */
> > > #define V4L2_PIX_FMT_H264_NO_SC v4l2_fourcc('A', 'V', 'C', '1') /* H264 without start codes */
> > > #define V4L2_PIX_FMT_H264_MVC v4l2_fourcc('M', '2', '6', '4') /* H264 MVC */
> > > +#define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> >
> > Are we okay with adding here already, without going through staging first?
>
> This is what we did for MPEG-2 already (the format is public but the
> controls are not), so I'm not sure this is causing any issue.
>
As pointed out by Nicolas on IRC, the V4L2_PIX_FMT_H264_SLICE_RAW and V4L2_PIX_FMT_H264_SLICE_ANNEX_B
should describe pretty well the pixel format.
I believe it's acceptable for them to go public.
Thanks!
Ezequiel