scale.h File Reference

#include "avfilter.h"

Go to the source code of this file.

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

Function Documentation

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 106 of file scale.c.

Referenced by config_props(), cudascale_config_props(), nppscale_config_props(), and scale_vaapi_config_output().

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

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.

Returns 0.

Definition at line 186 of file scale.c.

Referenced by config_props(), cudascale_config_props(), nppscale_config_props(), and scale_vaapi_config_output().