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| author | Paul B Mahol <onemda@gmail.com> | 2017-08-18 09:15:33 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2017-08-19 12:42:24 +0200 |
| commit | 1146133df8117c96cc6681a062df6df825fcae2d (patch) | |
| tree | 19cb503e6e87c1ebf223724e9e2afd0cac991eeb /libavutil | |
| parent | e3a4afca07b2753269f5f05c6fd5ca3034734c00 (diff) | |
| download | ffmpeg-1146133df8117c96cc6681a062df6df825fcae2d.tar.gz | |
avutil/eval: add linear interpolation helper
Diffstat (limited to 'libavutil')
| -rw-r--r-- | libavutil/eval.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/libavutil/eval.c b/libavutil/eval.c index 638259adef..b5f4ea2409 100644 --- a/libavutil/eval.c +++ b/libavutil/eval.c @@ -155,7 +155,7 @@ struct AVExpr { e_pow, e_mul, e_div, e_add, e_last, e_st, e_while, e_taylor, e_root, e_floor, e_ceil, e_trunc, e_round, e_sqrt, e_not, e_random, e_hypot, e_gcd, - e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2 + e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2, e_lerp, } type; double value; // is sign in other types union { @@ -208,6 +208,12 @@ static double eval_expr(Parser *p, AVExpr *e) return e->value * (d >= eval_expr(p, e->param[1]) && d <= eval_expr(p, e->param[2])); } + case e_lerp: { + double v0 = eval_expr(p, e->param[0]); + double v1 = eval_expr(p, e->param[1]); + double f = eval_expr(p, e->param[2]); + return v0 + (v1 - v0) * f; + } case e_print: { double x = eval_expr(p, e->param[0]); int level = e->param[1] ? av_clip(eval_expr(p, e->param[1]), INT_MIN, INT_MAX) : AV_LOG_INFO; @@ -456,6 +462,7 @@ static int parse_primary(AVExpr **e, Parser *p) else if (strmatch(next, "between"))d->type = e_between; else if (strmatch(next, "clip" )) d->type = e_clip; else if (strmatch(next, "atan2" )) d->type = e_atan2; + else if (strmatch(next, "lerp" )) d->type = e_lerp; else { for (i=0; p->func1_names && p->func1_names[i]; i++) { if (strmatch(next, p->func1_names[i])) { @@ -654,6 +661,7 @@ static int verify_expr(AVExpr *e) && (!e->param[2] || verify_expr(e->param[2])); case e_between: case e_clip: + case e_lerp: return verify_expr(e->param[0]) && verify_expr(e->param[1]) && verify_expr(e->param[2]); |