#include <inttypes.h>
#include <stdint.h>
#include "scale_eval.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"

Enumerations
enum	var_name { VAR_IN_W , VAR_IW , VAR_IN_H , VAR_IH , VAR_OUT_W , VAR_OW , VAR_OUT_H , VAR_OH , VAR_A , VAR_SAR , VAR_DAR , VAR_HSUB , VAR_VSUB , VAR_OHSUB , VAR_OVSUB , VARS_NB }

Functions
int	ff_scale_eval_dimensions (void log_ctx, const char w_expr, const char h_expr, AVFilterLink inlink, AVFilterLink outlink, int ret_w, int *ret_h)
	Parse and evaluate string expressions for width and height.

int	ff_scale_adjust_dimensions (AVFilterLink inlink, int ret_w, int *ret_h, int force_original_aspect_ratio, int force_divisible_by, double w_adj)
	Transform evaluated width and height obtained from ff_scale_eval_dimensions into actual target width and height for scaling.

Variables
static const char *const	var_names []

Enumeration Type Documentation

◆ var_name

enum var_name

Enumerator
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_OHSUB
VAR_OVSUB
VARS_NB

Definition at line 43 of file scale_eval.c.

Function Documentation

◆ ff_scale_eval_dimensions()

int ff_scale_eval_dimensions	(	void *	ctx,
		const char *	w_expr,
		const char *	h_expr,
		AVFilterLink *	inlink,
		AVFilterLink *	outlink,
		int *	ret_w,
		int *	ret_h )

Parse and evaluate string expressions for width and height.

Upon success, ff_scale_adjust_dimensions must be called with evaluated width and height to obtain actual target dimensions.

Returns 0 upon success, negative value if one of the expressions could not be parsed or if NaN was the result of their evaluation.

Definition at line 58 of file scale_eval.c.

Referenced by amf_init_filter_config(), cudascale_config_props(), libplacebo_config_output(), scale_d3d11_config_props(), scale_d3d12_config_props(), scale_vaapi_config_output(), scale_vt_config_output(), and scale_vulkan_config_output().

◆ ff_scale_adjust_dimensions()

int ff_scale_adjust_dimensions	(	AVFilterLink *	inlink,
		int *	ret_w,
		int *	ret_h,
		int	force_original_aspect_ratio,
		int	force_divisible_by,
		double	w_adj )

Transform evaluated width and height obtained from ff_scale_eval_dimensions into actual target width and height for scaling.

Adjustment can occur if one or both of the evaluated values are of the form '-n' or if force_original_aspect_ratio is set. force_divisible_by is used only when force_original_aspect_ratio is set and must be at least 1. w_adj is the input SAR when the output dimensions are intended to be square pixels, else should be 1.

Returns negative error code on error or non negative on success

Definition at line 123 of file scale_eval.c.

Referenced by amf_init_filter_config(), config_props(), config_props(), cudascale_config_props(), libplacebo_config_output(), scale_d3d12_config_props(), scale_vaapi_config_output(), scale_vt_config_output(), and scale_vulkan_config_output().

Variable Documentation

◆ var_names

const char* const var_names[]

static

Initial value:

= {
    "in_w",   "iw",
    "in_h",   "ih",
    "out_w",  "ow",
    "out_h",  "oh",
    "a",
    "sar",
    "dar",
    "hsub",
    "vsub",
    "ohsub",
    "ovsub",
    NULL
}

Definition at line 28 of file scale_eval.c.

Enumerations

Functions