Edit

Share via

D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAGS enumeration (d3d12video.h)

Specifies flags for a D3D12_VIDEO_ENCODER_RATE_CONTROL structure.

Syntax

typedef enum D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAGS {
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_NONE,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_DELTA_QP,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_FRAME_ANALYSIS,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_QP_RANGE,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_INITIAL_QP,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_MAX_FRAME_SIZE,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_VBV_SIZES,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_EXTENSION1_SUPPORT = 0x40,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_QUALITY_VS_SPEED = 0x80,
  D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_SPATIAL_ADAPTIVE_QP
} ;

Constants

 
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_NONE
None.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_DELTA_QP
If the selected rate control is D3D12_VIDEO_ENCODER_RATE_CONTROL_MODE_ABSOLUTE_QP_MAP, this flag has no effect since the QP values in D3D12_VIDEO_ENCODER_RATE_CONTROL.pRateControlQPMap field are used as absolute QP values.

For the other rate control modes, this flag enables the usage of D3D12_VIDEO_ENCODER_RATE_CONTROL.pRateControlQPMap to be interpreted as a delta QP map to be used for the current frame encode operation. The values provided in the map are incremented/decremented on top of the QP values decided by the rate control algorithm or the baseline QP constant set in CQP mode.

Note Using delta QP adjustment along with some active rate control modes may violate bitrate constraints as it's explicitly altering the QP values that were selected by rate control budgeting algorithm.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_FRAME_ANALYSIS
If D3D12_VIDEO_ENCODER_SUPPORT_FLAG_RATE_CONTROL_FRAME_ANALYSIS_AVAILABLE is supported, enables the rate control algorithm to optimize bitrate usage by selecting QP values based on statistics collected by doing frame analysis on a first pass. When additional support is reported in D3D12_FEATURE_VIDEO_ENCODER_RATE_CONTROL_FRAME_ANALYSIS, this flag can be used in combination with D3D12_VIDEO_ENCODER_HEAP_DESC1.Pow2DownscaleFactor to determine the resolution of the 1st pass.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_QP_RANGE
The MinQp/MaxQP values are used as a range for the rate control algorithm.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_INITIAL_QP
The InitialQP values are used as a range for the rate control algorithm.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_MAX_FRAME_SIZE
When D3D12_VIDEO_ENCODER_SUPPORT_FLAG_RATE_CONTROL_MAX_FRAME_SIZE is supported, the rate control algorithm will limit the maximum size per frame to the specified parameter in the rate control configuration.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_VBV_SIZES
Enables the usage of VBVCapacity and InitialVBVFullness.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_EXTENSION1_SUPPORT
Enables extension 1 support for rate control.
D3D12_VIDEO_ENCODER_RATE_CONTROL_FLAG_ENABLE_QUALITY_VS_SPEED
Enables quality vs speed configuration for rate control.

Requirements

Requirement Value
Minimum supported client Windows Build 22000
Minimum supported server Windows Build 22000
Header d3d12video.h
  • Last updated on