#include <stddef.h>
#include <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/frame.h"

Data Structures
struct	AVVideoEncParams
	Video encoding parameters for a given frame. More...

struct	AVVideoBlockParams
	Data structure for storing block-level encoding information. More...

Enumerations
enum	AVVideoEncParamsType { AV_VIDEO_ENC_PARAMS_NONE = -1, AV_VIDEO_ENC_PARAMS_VP9, AV_VIDEO_ENC_PARAMS_H264 }

Functions
static av_always_inline AVVideoBlockParams *	av_video_enc_params_block (AVVideoEncParams *par, unsigned int idx)

AVVideoEncParams *	av_video_enc_params_alloc (enum AVVideoEncParamsType type, unsigned int nb_blocks, size_t *out_size)
	Allocates memory for AVVideoEncParams of the given type, plus an array of. More...

AVVideoEncParams *	av_video_enc_params_create_side_data (AVFrame *frame, enum AVVideoEncParamsType type, unsigned int nb_blocks)
	Allocates memory for AVEncodeInfoFrame plus an array of. More...

Enumeration Type Documentation

◆ AVVideoEncParamsType

enum AVVideoEncParamsType

Enumerator

AV_VIDEO_ENC_PARAMS_NONE

AV_VIDEO_ENC_PARAMS_VP9

VP9 stores:

per-frame base (luma AC) quantizer index, exported as AVVideoEncParams.qp
deltas for luma DC, chroma AC and chroma DC, exported in the corresponding entries in AVVideoEncParams.delta_qp
per-segment delta, exported as for each block as AVVideoBlockParams.delta_qp

To compute the resulting quantizer index for a block:

for luma AC, add the base qp and the per-block delta_qp, saturating to unsigned 8-bit.
for luma DC and chroma AC/DC, add the corresponding AVVideoBlockParams.delta_qp to the luma AC index, again saturating to unsigned 8-bit.

AV_VIDEO_ENC_PARAMS_H264

H.264 stores:

in PPS (per-picture):
- initial QP_Y (luma) value, exported as AVVideoEncParams.qp
- delta(s) for chroma QP values (same for both, or each separately), exported as in the corresponding entries in AVVideoEncParams.delta_qp
per-slice QP delta, not exported directly, added to the per-MB value
per-MB delta; not exported directly; the final per-MB quantizer parameter - QP_Y - minus the value in AVVideoEncParams.qp is exported as AVVideoBlockParams.qp_delta.

Definition at line 28 of file video_enc_params.h.

Function Documentation

◆ av_video_enc_params_block()

static av_always_inline AVVideoBlockParams* av_video_enc_params_block	(	AVVideoEncParams *	par,
		unsigned int	idx
	)

static

Definition at line 135 of file video_enc_params.h.

Referenced by decode_read(), h264_export_enc_params(), and vp9_export_enc_params().

◆ av_video_enc_params_alloc()

AVVideoEncParams* av_video_enc_params_alloc	(	enum AVVideoEncParamsType	type,
		unsigned int	nb_blocks,
		size_t *	out_size
	)

Allocates memory for AVVideoEncParams of the given type, plus an array of.

nb_blocks

AVVideoBlockParams and initializes the variables. Can be freed with a normal av_free() call.

Parameters

out_size if non-NULL, the size in bytes of the resulting data array is written here.

Definition at line 29 of file video_enc_params.c.

Referenced by av_video_enc_params_create_side_data().

◆ av_video_enc_params_create_side_data()

AVVideoEncParams* av_video_enc_params_create_side_data	(	AVFrame *	frame,
		enum AVVideoEncParamsType	type,
		unsigned int	nb_blocks
	)

Allocates memory for AVEncodeInfoFrame plus an array of.

nb_blocks

AVEncodeInfoBlock in the given AVFrame

frame

as AVFrameSideData of type AV_FRAME_DATA_ENCODE_INFO and initializes the variables.

Definition at line 57 of file video_enc_params.c.

Referenced by h264_export_enc_params(), and vp9_export_enc_params().

Data Structures