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af_scaletempo: use Hann function for overlap window

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Better in theory, but not really noticable.
This commit is contained in:
Christoph Heinrich
2023-09-29 20:11:01 +02:00
committed by Kacper Michajłow
parent 3a85fd97e5
commit 2287804739
1 changed files with 7 additions and 4 deletions
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11
audio/filter/af_scaletempo.c
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@@ -35,6 +35,7 @@
#include <string.h> #include <string.h>
#include <limits.h> #include <limits.h>
#include <assert.h> #include <assert.h>
#include <math.h>
#include "audio/aframe.h" #include "audio/aframe.h"
#include "audio/format.h" #include "audio/format.h"
@@ -422,18 +423,20 @@ static bool reinit(struct mp_filter *f)
memset(s->buf_overlap, 0, s->bytes_overlap); memset(s->buf_overlap, 0, s->bytes_overlap);
if (use_int) { if (use_int) {
int32_t *pb = s->table_blend; int32_t *pb = s->table_blend;
int64_t blend = 0; const float scale = M_PI / frames_overlap;
for (int i = 0; i < frames_overlap; i++) { for (int i = 0; i < frames_overlap; i++) {
int32_t v = blend / frames_overlap; // Hann function
const int32_t v = 0.5f * (1.0f - cosf(i * scale)) * 65536 + 0.5;
for (int j = 0; j < nch; j++) for (int j = 0; j < nch; j++)
*pb++ = v; *pb++ = v;
blend += 65536; // 2^16
} }
s->output_overlap = output_overlap_s16; s->output_overlap = output_overlap_s16;
} else { } else {
float *pb = s->table_blend; float *pb = s->table_blend;
const float scale = M_PI / frames_overlap;
for (int i = 0; i < frames_overlap; i++) { for (int i = 0; i < frames_overlap; i++) {
float v = i / (float)frames_overlap; // Hann function
const float v = 0.5f * (1.0f - cosf(i * scale));
for (int j = 0; j < nch; j++) for (int j = 0; j < nch; j++)
*pb++ = v; *pb++ = v;
} }