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D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAGS_0080 enumeration (d3d12umddi.h)

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The D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAGS_0080 enumeration specifies the flags for rate control.

Syntax

typedef enum D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAGS_0080 {
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_NONE = 0x0,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_DELTA_QP = 0x1,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_FRAME_ANALYSIS = 0x2,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_QP_RANGE = 0x4,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_INITIAL_QP = 0x8,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_MAX_FRAME_SIZE = 0x10,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_1_ENABLE_VBV_SIZES = 0x20,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0096_ENABLE_EXTENSION1_SUPPORT = 0x40,
  D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0096_ENABLE_QUALITY_VS_SPEED = 0x80
} ;

Constants

 
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_NONE
Value: 0x0
No rate control flags.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_DELTA_QP
Value: 0x1
If the selected rate control mode is D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_ABSOLUTE_QP_MAP, this flag has no effect since the QP values in pRateControlQPMap field are used as absolute QP values.

For the other rate control modes, this flag enables 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.

Using delta QP adjustment along with some active rate control modes might violate bitrate constraints as it explicitly alters the QP values that were selected by the rate control budgeting algorithm.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_FRAME_ANALYSIS
Value: 0x2
If support is indicated in D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAGS, this flag 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.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_QP_RANGE
Value: 0x4
When set, use the MinQp and MaxQp values as a range for the rate control algorithm.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_INITIAL_QP
Value: 0x8
When set, use the InitialQP values as a range for the rate control algorithm.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_ENABLE_MAX_FRAME_SIZE
Value: 0x10
When D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAG_0083_0_RATE_CONTROL_MAX_FRAME_SIZE_AVAILABLE is supported, the rate control algorithm should limit the maximum size per frame to the specified parameter in the rate control configuration.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0080_1_ENABLE_VBV_SIZES
Value: 0x20
When set, enable the usage of VBVCapacity and InitialVBVFullness.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0096_ENABLE_EXTENSION1_SUPPORT
Value: 0x40
Requires D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAG_RATE_CONTROL_EXTENSION1_SUPPORT to be set. See Remarks.
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0096_ENABLE_QUALITY_VS_SPEED
Value: 0x80
Requires D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAG_RATE_CONTROL_EXTENSION1_SUPPORT and D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAG_RATE_CONTROL_QUALITY_VS_SPEED_AVAILABLE. When enabled, indicates the use of QualityVsSpeed in the rate control structure.

Remarks

When D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_FLAG_0096_ENABLE_EXTENSION1_SUPPORT is enabled, this indicates that the rate control structures extended for AV1 encoding will be used in D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS.pConfiguration_Xxx, as per the following table.

Rate control mode when flag is enabled D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS type D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS DataSize
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_ABSOLUTE_QP_MAP D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_ABSOLUTE_QP_MAP sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_ABSOLUTE_QP_MAP)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_CQP D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CQP1 sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CQP1)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_CBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR1 sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR1)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_VBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_VBR1 sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_VBR1)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_QVBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_QVBR1 sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_QVBR1)

Otherwise, the legacy structures will be used when disabled, as per the following table.

Rate control mode when flag is disabled D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS type D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CONFIGURATION_PARAMS DataSize
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_ABSOLUTE_QP_MAP NULL 0
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_CQP D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CQP sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CQP)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_CBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_VBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_VBR sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_VBR)
D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_MODE_QVBR D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_QVBR sizeof(D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_QVBR)

See D3D12 video encoding for general information.

Requirements

Requirement Value
Minimum supported client Windows 11 (WDDM 3.0)
Header d3d12umddi.h

See also

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_0080_2

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_CBR_0080

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_QVBR_0080_2

D3D12DDI_VIDEO_ENCODER_RATE_CONTROL_VBR_0080

D3D12DDI_VIDEO_ENCODER_SUPPORT_FLAGS_0083_0

PFND3D12DDI_VIDEO_ENCODE_FRAME_0082_0