AVVideoEncParams Struct Reference

Video encoding parameters for a given frame. More...

#include <video_enc_params.h>

Data Fields
unsigned int	nb_blocks
	Number of blocks in the array. More...
size_t	blocks_offset
	Offset in bytes from the beginning of this structure at which the array of blocks starts. More...
size_t	block_size
enum AVVideoEncParamsType	type
	Type of the parameters (the codec they are used with). More...
int32_t	qp
	Base quantisation parameter for the frame. More...
int32_t	delta_qp [4][2]
	Quantisation parameter offset from the base (per-frame) qp for a given plane (first index) and AC/DC coefficients (second index). More...

Detailed Description

Video encoding parameters for a given frame.

This struct is allocated along with an optional array of per-block AVVideoBlockParams descriptors. Must be allocated with av_video_enc_params_alloc().

Definition at line 73 of file video_enc_params.h.

Field Documentation

nb_blocks

unsigned int AVVideoEncParams::nb_blocks

Number of blocks in the array.

May be 0, in which case no per-block information is present. In this case the values of blocks_offset / block_size are unspecified and should not be accessed.

Definition at line 81 of file video_enc_params.h.

Referenced by av_video_enc_params_alloc(), dump_video_enc_params(), ff_qp_table_extract(), filter_frame(), and process_frame().

blocks_offset

size_t AVVideoEncParams::blocks_offset

Offset in bytes from the beginning of this structure at which the array of blocks starts.

Definition at line 86 of file video_enc_params.h.

Referenced by av_video_enc_params_alloc(), and av_video_enc_params_block().

block_size

size_t AVVideoEncParams::block_size

Definition at line 90 of file video_enc_params.h.

Referenced by av_video_enc_params_alloc(), and av_video_enc_params_block().

type

enum AVVideoEncParamsType AVVideoEncParams::type

Type of the parameters (the codec they are used with).

Definition at line 95 of file video_enc_params.h.

Referenced by av_video_enc_params_alloc(), dump_video_enc_params(), ff_qp_table_extract(), filter_frame(), and process_frame().

qp

int32_t AVVideoEncParams::qp

Base quantisation parameter for the frame.

The final quantiser for a given block in a given plane is obtained from this value, possibly combined with

delta_qp 

and the per-block delta in a manner documented for each type.

Definition at line 103 of file video_enc_params.h.

Referenced by dump_video_enc_params(), ff_qp_table_extract(), filter_frame(), h264_export_enc_params(), process_frame(), and vp9_export_enc_params().

delta_qp

int32_t AVVideoEncParams::delta_qp[4][2]

Quantisation parameter offset from the base (per-frame) qp for a given plane (first index) and AC/DC coefficients (second index).

Definition at line 109 of file video_enc_params.h.

Referenced by dump_video_enc_params(), h264_export_enc_params(), process_frame(), and vp9_export_enc_params().

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The documentation for this struct was generated from the following file:

• libavutil/video_enc_params.h