* video padding filter
*/
+#include <float.h> /* DBL_MAX */
+
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
int x, y; ///< offsets of the input area with respect to the padded area
int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
int inlink_w, inlink_h;
+ AVRational aspect;
char *w_expr; ///< width expression string
char *h_expr; ///< height expression string
{
AVFilterContext *ctx = inlink->dst;
PadContext *s = ctx->priv;
+ AVRational adjusted_aspect = s->aspect;
int ret;
double var_values[VARS_NB], res;
char *expr;
if (!s->w)
var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w = inlink->w;
+ if (adjusted_aspect.num && adjusted_aspect.den) {
+ adjusted_aspect = av_div_q(adjusted_aspect, inlink->sample_aspect_ratio);
+ if (s->h < av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num)) {
+ s->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = av_rescale(s->w, adjusted_aspect.den, adjusted_aspect.num);
+ } else {
+ s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = av_rescale(s->h, adjusted_aspect.num, adjusted_aspect.den);
+ }
+ }
+
/* evaluate x and y */
av_expr_parse_and_eval(&res, (expr = s->x_expr),
var_names, var_values,
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
+ { "aspect", "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
{ NULL }
};