// Copyright 2018-2022 The Khronos Group Inc.
//
// SPDX-License-Identifier: CC-BY-4.0

include::{generated}/meta/{refprefix}VK_EXT_video_encode_h264.adoc[]

=== Other Extension Metadata

*Last Modified Date*::
    2022-09-18
*IP Status*::
    No known IP claims.
*Contributors*::
  - Ahmed Abdelkhalek, AMD
  - George Hao, AMD
  - Jake Beju, AMD
  - Peter Fang, AMD
  - Ping Liu, Intel
  - Srinath Kumarapuram, NVIDIA
  - Tony Zlatinski, NVIDIA
  - Yang Liu, AMD
  - Daniel Rakos, RasterGrid

=== Description

This extension builds upon the `apiext:VK_KHR_video_encode_queue` extension
by adding support for encoding elementary video stream sequences compliant
with the H.264/AVC video compression standard.

include::{generated}/interfaces/VK_EXT_video_encode_h264.adoc[]

=== Version History

  * Revision 0, 2018-7-23 (Ahmed Abdelkhalek)
  ** Initial draft
  * Revision 0.5, 2020-02-13 (Tony Zlatinski)
  ** General Spec cleanup
  ** Added DPB structures
  ** Change the VCL frame encode structure
  ** Added a common Non-VCL Picture Paramarameters structure
  * Revision 1, 2021-03-29 (Tony Zlatinski)
  ** Spec and API updates
  * Revision 2, August 1 2021 (Srinath Kumarapuram)
  ** Rename `VkVideoEncodeH264CapabilitiesFlagsEXT` to
     `VkVideoEncodeH264CapabilityFlagsEXT` and
     `VkVideoEncodeH264CapabilitiesFlagsEXT` to
     `VkVideoEncodeH264CapabilityFlagsEXT`, following Vulkan naming
     conventions.
  * Revision 3, 2021-12-08 (Ahmed Abdelkhalek)
  ** Rate control updates
  * Revision 4, 2022-02-04 (Ahmed Abdelkhalek)
  ** Align VkVideoEncodeH264VclFrameInfoEXT structure to similar one in
     VK_EXT_video_encode_h265 extension
  * Revision 5, 2022-02-10 (Ahmed Abdelkhalek)
  ** Updates to encode capability interface
  * Revision 6, 2022-03-16 (Ahmed Abdelkhalek)
  ** Relocate Std header version reporting/requesting from this extension to
     VK_KHR_video_queue extension.
  ** Remove redundant maxPictureSizeInMbs from
     VkVideoEncodeH264SessionCreateInfoEXT.
  ** Remove the now empty VkVideoEncodeH264SessionCreateInfoEXT.
  * Revision 7, 2022-04-06 (Ahmed Abdelkhalek)
  ** Add capability flag to report support to use B frame in L1 reference
     list.
  ** Add capability flag to report support for disabling SPS
     direct_8x8_inference_flag.
  * Revision 8, 2022-07-18 (Daniel Rakos)
  ** Replace `VkVideoEncodeH264RateControlStructureFlagBitsEXT` bit enum
     with `VkVideoEncodeH264RateControlStructureEXT` enum
  ** Rename `VkVideoEncodeH264ProfileEXT` to
     `VkVideoEncodeH264ProfileInfoEXT`
  ** Rename `VkVideoEncodeH264ReferenceListsEXT` to
     `VkVideoEncodeH264ReferenceListsInfoEXT`
  ** Rename `VkVideoEncodeH264EmitPictureParametersEXT` to
     `VkVideoEncodeH264EmitPictureParametersInfoEXT`
  ** Rename `VkVideoEncodeH264NaluSliceEXT` to
     `VkVideoEncodeH264NaluSliceInfoEXT`
  * Revision 9, 2022-09-18 (Daniel Rakos)
  ** Rename `spsStdCount`, `pSpsStd`, `ppsStdCount`, and `pPpsStd` to
     `stdSPSCount`, `pStdSPSs`, `stdPPSCount`, and `pStdPPSs`, respectively,
     in `VkVideoEncodeH264SessionParametersAddInfoEXT`
  ** Rename `maxSpsStdCount` and `maxPpsStdCount` to `maxStdSPSCount` and
     `maxStdPPSCount`, respectively, in
     `VkVideoEncodeH264SessionParametersCreateInfoEXT`