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avfilter/vf_qp: split expression parsing out of loop 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-03-28 15:17:36 +01:00
parent 625bd463cd
commit a8fb8f6112
1 changed files with 14 additions and 9 deletions
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23
libavfilter/vf_qp.c
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@ -50,26 +50,31 @@ static int config_input(AVFilterLink *inlink)
AVFilterContext *ctx = inlink->dst;
QPContext *s = ctx->priv;
int i;
int ret;
AVExpr *e = NULL;
static const char *var_names[] = { "known", "qp", NULL };
if (!s->qp_expr_str)
return 0;
ret = av_expr_parse(&e, s->qp_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0)
return ret;
s->h = (inlink->h + 15) >> 4;
s->qstride = (inlink->w + 15) >> 4;
for (i = -129; i < 128; i++) {
double var_values[] = { i != -129, i, 0 };
static const char *var_names[] = { "known", "qp", NULL };
double temp_val;
int ret;
double var_values[] = { i != -129, i, 0};
double temp_val = av_expr_eval(e, var_values, NULL);
ret = av_expr_parse_and_eval(&temp_val, s->qp_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, 0, 0, ctx);
if (ret < 0)
return ret;
if (isnan(temp_val)) {
av_expr_free(e);
return AVERROR(EINVAL);
}
s->lut[i + 129] = lrintf(temp_val);
}
av_expr_free(e);
return 0;
}