avfilter/avf_ahistogram: make use of av_rescale

diff --git a/libavfilter/avf_ahistogram.c b/libavfilter/avf_ahistogram.c
index 7795f3913cd5df5ca630002c05d3f0af7af7c1da..a0931bfa58a2530efebc35d3e8887c168a3aa6be 100644 (file)
--- a/libavfilter/avf_ahistogram.c
+++ b/libavfilter/avf_ahistogram.c
@@ -120,7 +120,7 @@ static int config_input(AVFilterLink *inlink)
     AVFilterContext *ctx = inlink->dst;
     AudioHistogramContext *s = ctx->priv;
 
-    s->nb_samples = FFMAX(1, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
+    s->nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
     s->dchannels = s->dmode == SINGLE ? 1 : inlink->channels;
     s->shistogram = av_calloc(s->w, s->dchannels * sizeof(*s->shistogram));
     if (!s->shistogram)