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avfilter/avf_showspectrum: Avoid allocation

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Also fixes an instance of shadowing.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2026-02-23 23:14:52 +01:00
parent 7950e5d1a5
commit 1bbac3643b
1 changed files with 5 additions and 8 deletions
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13
libavfilter/avf_showspectrum.c
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@@ -30,6 +30,7 @@
#include <float.h>
#include <math.h>
#include <stdio.h>
#include "libavutil/mem.h"
#include "libavutil/tx.h"
@@ -951,17 +952,13 @@ static int draw_legend(AVFilterContext *ctx, uint64_t samples)
}
for (y = 0; ch == 0 && y < h + 5; y += 25) {
static const char *log_fmt = "%.0f";
static const char *lin_fmt = "%.3f";
const float a = av_clipf(1.f - y / (float)(h - 1), 0.f, 1.f);
const float value = s->scale == LOG ? log10f(get_iscale(ctx, s->scale, a)) * 20.f : get_iscale(ctx, s->scale, a);
char *text;
char scale_fmt[32];
text = av_asprintf(s->scale == LOG ? log_fmt : lin_fmt, value);
if (!text)
continue;
drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 3, text, 0);
av_free(text);
snprintf(scale_fmt, sizeof(scale_fmt),
s->scale == LOG ? "%.0f" : "%.3f", value);
drawtext(s->outpicref, s->w + s->start_x + 35, s->start_y + y - 3, scale_fmt, 0);
}
}