58 const char *w_expr,
const char *h_expr,
60 int *ret_w,
int *ret_h)
67 double var_values[
VARS_NB], res;
73 var_values[
VAR_A] = (double) inlink->
w / inlink->
h;
86 eval_w = var_values[
VAR_OUT_W] = var_values[
VAR_OW] = (
int) res == 0 ? inlink->
w : (
int) res;
92 eval_h = var_values[
VAR_OUT_H] = var_values[
VAR_OH] = (
int) res == 0 ? inlink->
h : (
int) res;
98 eval_w = (
int) res == 0 ? inlink->
w : (
int) res;
107 "Error when evaluating the expression '%s'.\n" 108 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
109 expr, w_expr, h_expr);
114 int *ret_w,
int *ret_h,
115 int force_original_aspect_ratio,
int force_divisible_by)
118 int factor_w, factor_h;
134 if (w < 0 && h < 0) {
143 w =
av_rescale(h, inlink->
w, inlink->
h * factor_w) * factor_w;
145 h =
av_rescale(w, inlink->
h, inlink->
w * factor_h) * factor_h;
150 if (force_original_aspect_ratio) {
154 if (force_original_aspect_ratio == 1) {
157 if (force_divisible_by > 1) {
159 w = w / force_divisible_by * force_divisible_by;
160 h = h / force_divisible_by * force_divisible_by;
165 if (force_divisible_by > 1) {
167 w = (w + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
168 h = (h + force_divisible_by - 1) / force_divisible_by * force_divisible_by;
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
int h
agreed upon image height
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
A link between two filters.
int av_expr_parse_and_eval(double *d, const char *s, const char *const *const_names, const double *const_values, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), void *opaque, int log_offset, void *log_ctx)
Parse and evaluate an expression.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
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 w
agreed upon image width
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
static const char *const var_names[]
int format
agreed upon media format
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
AVRational sample_aspect_ratio
agreed upon sample aspect ratio
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 ...
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
simple arithmetic expression evaluator