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// Copyright 2020-2024 The Khronos Group Inc.
//
// SPDX-License-Identifier: CC-BY-4.0
// Common H.264 Parameter Set descriptions
// "operationType" attribute specifies whether this is included in the encode or decode section
[[{operationType}-h264-sps]]
H.264 Sequence Parameter Sets (SPS)::
Represented by code:StdVideoH264SequenceParameterSet structures and
interpreted as follows:
* code:reserved1 and code:reserved2 are used only for padding purposes and
are otherwise ignored;
* code:seq_parameter_set_id is used as the key of the SPS entry;
* code:level_idc is one of the enum constants
`STD_VIDEO_H264_LEVEL_IDC_<major>_<minor>` identifying the H.264 level
`<major>.<minor>` as defined in section A.3 of the <<itu-t-h264,ITU-T
H.264 Specification>>;
* if code:flags.seq_scaling_matrix_present_flag is set, then the
code:StdVideoH264ScalingLists structure pointed to by code:pScalingLists
is interpreted as follows:
** code:scaling_list_present_mask is a bitmask where bit index [eq]#i#
corresponds to `seq_scaling_list_present_flag[i]` as defined in section
7.4.2.1 of the <<itu-t-h264,ITU-T H.264 Specification>>;
** code:use_default_scaling_matrix_mask is a bitmask where bit index
[eq]#i# corresponds to `UseDefaultScalingMatrix4x4Flag[i]`, when [eq]#i
< 6#, or corresponds to `UseDefaultScalingMatrix8x8Flag[i-6]`,
otherwise, as defined in section 7.3.2.1 of the <<itu-t-h264,ITU-T
H.264 Specification>>;
** code:ScalingList4x4 and code:ScalingList8x8 correspond to the
identically named syntax elements defined in section 7.3.2.1 of the
<<itu-t-h264,ITU-T H.264 Specification>>;
* if code:flags.vui_parameters_present_flag is set, then
code:pSequenceParameterSetVui is a pointer to a
code:StdVideoH264SequenceParameterSetVui structure that is interpreted
as follows:
** code:reserved1 is used only for padding purposes and is otherwise
ignored;
** if code:flags.nal_hrd_parameters_present_flag or
code:flags.vcl_hrd_parameters_present_flag is set, then the
code:StdVideoH264HrdParameters structure pointed to by
code:pHrdParameters is interpreted as follows:
*** code:reserved1 is used only for padding purposes and is otherwise
ignored;
*** all other members of code:StdVideoH264HrdParameters are interpreted as
defined in section E.2.2 of the <<itu-t-h264,ITU-T H.264
Specification>>;
** all other members of code:StdVideoH264SequenceParameterSetVui are
interpreted as defined in section E.2.1 of the <<itu-t-h264,ITU-T H.264
Specification>>;
* all other members of code:StdVideoH264SequenceParameterSet are
interpreted as defined in section 7.4.2.1 of the <<itu-t-h264,ITU-T
H.264 Specification>>.
[[{operationType}-h264-pps]]
H.264 Picture Parameter Sets (PPS)::
Represented by code:StdVideoH264PictureParameterSet structures and
interpreted as follows:
* the pair constructed from code:seq_parameter_set_id and
code:pic_parameter_set_id is used as the key of the PPS entry;
* if code:flags.pic_scaling_matrix_present_flag is set, then the
code:StdVideoH264ScalingLists structure pointed to by code:pScalingLists
is interpreted as follows:
** code:scaling_list_present_mask is a bitmask where bit index [eq]#i#
corresponds to `pic_scaling_list_present_flag[i]` as defined in section
7.4.2.2 of the <<itu-t-h264,ITU-T H.264 Specification>>;
** code:use_default_scaling_matrix_mask is a bitmask where bit index
[eq]#i# corresponds to `UseDefaultScalingMatrix4x4Flag[i]`, when [eq]#i
< 6#, or corresponds to `UseDefaultScalingMatrix8x8Flag[i-6]`,
otherwise, as defined in section 7.3.2.2 of the <<itu-t-h264,ITU-T
H.264 Specification>>;
** code:ScalingList4x4 and code:ScalingList8x8 correspond to the
identically named syntax elements defined in section 7.3.2.2 of the
<<itu-t-h264,ITU-T H.264 Specification>>;
* all other members of code:StdVideoH264PictureParameterSet are
interpreted as defined in section 7.4.2.2 of the <<itu-t-h264,ITU-T
H.264 Specification>>.
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