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avfilter/af_drmeter: improve measurement precision

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This commit is contained in:
Paul B Mahol 2021-11-18 22:14:11 +01:00
parent 2f472d5d65
commit 8c150d3d97
1 changed files with 4 additions and 4 deletions
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8
libavfilter/af_drmeter.c
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@ -26,7 +26,7 @@
#include "avfilter.h" #include "avfilter.h"
#include "internal.h" #include "internal.h"
#define BINS 10000 #define BINS 32768
typedef struct ChannelStats { typedef struct ChannelStats {
uint64_t nb_samples; uint64_t nb_samples;
@ -75,8 +75,8 @@ static void finish_block(ChannelStats *p)
rms = sqrt(2 * p->sum / p->nb_samples); rms = sqrt(2 * p->sum / p->nb_samples);
peak = p->peak; peak = p->peak;
rms_bin = av_clip(rms * BINS, 0, BINS); rms_bin = av_clip(lrintf(rms * BINS), 0, BINS);
peak_bin = av_clip(peak * BINS, 0, BINS); peak_bin = av_clip(lrintf(peak * BINS), 0, BINS);
p->rms[rms_bin]++; p->rms[rms_bin]++;
p->peaks[peak_bin]++; p->peaks[peak_bin]++;
@ -158,7 +158,7 @@ static void print_stats(AVFilterContext *ctx)
for (i = BINS, j = 0; i >= 0 && j < 0.2 * p->blknum; i--) { for (i = BINS, j = 0; i >= 0 && j < 0.2 * p->blknum; i--) {
if (p->rms[i]) { if (p->rms[i]) {
rmssum += SQR(i / (double)BINS) * p->rms[i]; rmssum += SQR(i / (double)BINS);
j += p->rms[i]; j += p->rms[i];
} }
} }