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avutil/eval: add linear interpolation helper
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@ -864,6 +864,9 @@ Load the value of the internal variable with number
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@var{var}, which was previously stored with st(@var{var}, @var{expr}).
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The function returns the loaded value.
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@item lerp(x, y, z)
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Return linear interpolation between @var{x} and @var{y} by amount of @var{z}.
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@item log(x)
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Compute natural logarithm of @var{x}.
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@ -155,7 +155,7 @@ struct AVExpr {
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e_pow, e_mul, e_div, e_add,
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e_last, e_st, e_while, e_taylor, e_root, e_floor, e_ceil, e_trunc, e_round,
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e_sqrt, e_not, e_random, e_hypot, e_gcd,
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e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2
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e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2, e_lerp,
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} type;
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double value; // is sign in other types
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union {
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@ -208,6 +208,12 @@ static double eval_expr(Parser *p, AVExpr *e)
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return e->value * (d >= eval_expr(p, e->param[1]) &&
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d <= eval_expr(p, e->param[2]));
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}
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case e_lerp: {
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double v0 = eval_expr(p, e->param[0]);
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double v1 = eval_expr(p, e->param[1]);
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double f = eval_expr(p, e->param[2]);
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return v0 + (v1 - v0) * f;
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}
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case e_print: {
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double x = eval_expr(p, e->param[0]);
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int level = e->param[1] ? av_clip(eval_expr(p, e->param[1]), INT_MIN, INT_MAX) : AV_LOG_INFO;
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@ -456,6 +462,7 @@ static int parse_primary(AVExpr **e, Parser *p)
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else if (strmatch(next, "between"))d->type = e_between;
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else if (strmatch(next, "clip" )) d->type = e_clip;
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else if (strmatch(next, "atan2" )) d->type = e_atan2;
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else if (strmatch(next, "lerp" )) d->type = e_lerp;
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else {
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for (i=0; p->func1_names && p->func1_names[i]; i++) {
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if (strmatch(next, p->func1_names[i])) {
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@ -654,6 +661,7 @@ static int verify_expr(AVExpr *e)
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&& (!e->param[2] || verify_expr(e->param[2]));
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case e_between:
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case e_clip:
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case e_lerp:
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return verify_expr(e->param[0]) &&
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verify_expr(e->param[1]) &&
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verify_expr(e->param[2]);
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