VkVideoEncodeH265CapabilityFlagBitsKHR(3)

C Specification

Bits which may be set in VkVideoEncodeH265CapabilitiesKHR::flags, indicating the H.265 encoding capabilities supported, are:

// Provided by VK_KHR_video_encode_h265
typedef enum VkVideoEncodeH265CapabilityFlagBitsKHR {
    VK_VIDEO_ENCODE_H265_CAPABILITY_HRD_COMPLIANCE_BIT_KHR = 0x00000001,
    VK_VIDEO_ENCODE_H265_CAPABILITY_PREDICTION_WEIGHT_TABLE_GENERATED_BIT_KHR = 0x00000002,
    VK_VIDEO_ENCODE_H265_CAPABILITY_ROW_UNALIGNED_SLICE_SEGMENT_BIT_KHR = 0x00000004,
    VK_VIDEO_ENCODE_H265_CAPABILITY_DIFFERENT_SLICE_SEGMENT_TYPE_BIT_KHR = 0x00000008,
    VK_VIDEO_ENCODE_H265_CAPABILITY_B_FRAME_IN_L0_LIST_BIT_KHR = 0x00000010,
    VK_VIDEO_ENCODE_H265_CAPABILITY_B_FRAME_IN_L1_LIST_BIT_KHR = 0x00000020,
    VK_VIDEO_ENCODE_H265_CAPABILITY_PER_PICTURE_TYPE_MIN_MAX_QP_BIT_KHR = 0x00000040,
    VK_VIDEO_ENCODE_H265_CAPABILITY_PER_SLICE_SEGMENT_CONSTANT_QP_BIT_KHR = 0x00000080,
    VK_VIDEO_ENCODE_H265_CAPABILITY_MULTIPLE_TILES_PER_SLICE_SEGMENT_BIT_KHR = 0x00000100,
    VK_VIDEO_ENCODE_H265_CAPABILITY_MULTIPLE_SLICE_SEGMENTS_PER_TILE_BIT_KHR = 0x00000200,
  // Provided by VK_KHR_video_encode_h265 with VK_KHR_video_encode_intra_refresh
    VK_VIDEO_ENCODE_H265_CAPABILITY_B_PICTURE_INTRA_REFRESH_BIT_KHR = 0x00000800,
  // Provided by VK_KHR_video_encode_h265 with VK_KHR_video_encode_quantization_map
    VK_VIDEO_ENCODE_H265_CAPABILITY_CU_QP_DIFF_WRAPAROUND_BIT_KHR = 0x00000400,
} VkVideoEncodeH265CapabilityFlagBitsKHR;

Description

VK_VIDEO_ENCODE_H265_CAPABILITY_HRD_COMPLIANCE_BIT_KHR specifies whether the implementation may be able to generate HRD compliant bitstreams if any of the nal_hrd_parameters_present_flag, vcl_hrd_parameters_present_flag, or sub_pic_hrd_params_present_flag members of StdVideoH265HrdFlags are set to 1 in the HRD parameters of the active VPS or active SPS, or if StdVideoH265SpsVuiFlags::vui_hrd_parameters_present_flag is set to 1 in the active SPS.
VK_VIDEO_ENCODE_H265_CAPABILITY_PREDICTION_WEIGHT_TABLE_GENERATED_BIT_KHR specifies that if the weighted_pred_flag or the weighted_bipred_flag member of StdVideoH265PpsFlags is set to 1 in the active PPS when encoding a P picture or B picture, respectively, then the implementation is able to internally decide syntax for pred_weight_table, as defined in section 7.4.7.3 of the ITU-T H.265 Specification, and the application is not required to provide a weight table in the H.265 slice segment header parameters.
VK_VIDEO_ENCODE_H265_CAPABILITY_ROW_UNALIGNED_SLICE_SEGMENT_BIT_KHR specifies that each slice segment in a frame with a single or multiple tiles per slice may begin or finish at any offset in a CTB row. If not supported, all slice segments in such a frame must begin at the start of a CTB row (and hence each slice segment must finish at the end of a CTB row). Also indicates that each slice segment in a frame with multiple slices per tile may begin or finish at any offset within the enclosing tile’s CTB row. If not supported, slice segments in such a frame must begin at the start of the enclosing tile’s CTB row (and hence each slice segment must finish at the end of the enclosing tile’s CTB row). When a picture is encoded with intra refresh, encoding non-rectangular slice segments also requires: support for the VkVideoEncodeIntraRefreshCapabilitiesKHR::nonRectangularIntraRefreshRegions capability.
VK_VIDEO_ENCODE_H265_CAPABILITY_DIFFERENT_SLICE_SEGMENT_TYPE_BIT_KHR specifies that when a frame is encoded with multiple slice segments, the implementation allows encoding each slice segment with a different StdVideoEncodeH265SliceSegmentHeader::slice_type specified in the H.265 slice segment header parameters. If not supported, all slice segments of the frame must be encoded with the same slice_type which corresponds to the picture type of the frame. There is one exception to this rule: if the picture is encoded with the intra refresh mode VK_VIDEO_ENCODE_INTRA_REFRESH_MODE_PER_PICTURE_PARTITION_BIT_KHR, then the currently refreshed slice segment must specify the slice_type STD_VIDEO_H265_SLICE_TYPE_I and can differ from the slice_type of the other slice segments regardless of whether VK_VIDEO_ENCODE_H265_CAPABILITY_DIFFERENT_SLICE_SEGMENT_TYPE_BIT_KHR is supported.
VK_VIDEO_ENCODE_H265_CAPABILITY_B_FRAME_IN_L0_LIST_BIT_KHR specifies support for using a B frame as L0 reference, as specified in StdVideoEncodeH265ReferenceListsInfo::RefPicList0 in the H.265 picture information.
VK_VIDEO_ENCODE_H265_CAPABILITY_B_FRAME_IN_L1_LIST_BIT_KHR specifies support for using a B frame as L1 reference, as specified in StdVideoEncodeH265ReferenceListsInfo::RefPicList1 in the H.265 picture information.
VK_VIDEO_ENCODE_H265_CAPABILITY_PER_PICTURE_TYPE_MIN_MAX_QP_BIT_KHR specifies support for specifying different QP values in the members of VkVideoEncodeH265QpKHR.
VK_VIDEO_ENCODE_H265_CAPABILITY_PER_SLICE_SEGMENT_CONSTANT_QP_BIT_KHR specifies support for specifying different constant QP values for each slice segment.
VK_VIDEO_ENCODE_H265_CAPABILITY_MULTIPLE_TILES_PER_SLICE_SEGMENT_BIT_KHR specifies whether encoding multiple tiles per slice segment, as defined in section 6.3.1 of the ITU-T H.265 Specification, is supported. If this capability flag is not present, then the implementation is only able to encode a single tile for each slice segment.
VK_VIDEO_ENCODE_H265_CAPABILITY_MULTIPLE_SLICE_SEGMENTS_PER_TILE_BIT_KHR specifies whether encoding multiple slice segments per tile, as defined in section 6.3.1 of the ITU-T H.265 Specification, is supported. If this capability flag is not present, then the implementation is only able to encode a single slice segment for each tile.
VK_VIDEO_ENCODE_H265_CAPABILITY_CU_QP_DIFF_WRAPAROUND_BIT_KHR indicates support for wraparound during the calculation of the QP values of subsequently encoded coding units, as defined in section 7.4.9.14 of the ITU-T H.265 Specification. If not supported, equation 8-283 of the ITU-T H.265 Specification is effectively reduced to the following:

Qp_Y = qP_{Y_PRED} + CuQpDeltaVal

Note

The effect of this is that the maximum QP difference across subsequent coding units is limited to the [-(26 + QpBdOffset_Y / 2), 25 + QpBdOffset_Y / 2] range.
VK_VIDEO_ENCODE_H265_CAPABILITY_B_PICTURE_INTRA_REFRESH_BIT_KHR indicates support for encoding B pictures with intra refresh enabled.

Document Notes

For more information, see the Vulkan Specification.

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

Copyright

SPDX-License-Identifier: CC-BY-4.0

VkVideoEncodeH265CapabilityFlagBitsKHR(3) Manual Page

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