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avfilter/af_loudnorm: add stats_file option

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loudnorm provides stats output that's meant to be used for two-pass
normalization. These stats are often interleaved with ffmpeg's stream
descriptions and other output, making them difficult to parse and pass
to the second pass. The new stats_file option enables writing the stats
to a separate file, or to standard output, for simple parsing and other
programmatic usage.

Signed-off-by: Adam Jensen <adam@acj.sh>
This commit is contained in:
Adam Jensen
2026-02-15 11:28:25 -05:00
committed by Gyan Doshi
parent 52b676bb29
commit 059c57a83e
2 changed files with 44 additions and 4 deletions
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5
doc/filters.texi
View File

@@ -5914,6 +5914,11 @@ Options are true or false. Default is false.
@item print_format
Set print format for stats. Options are summary, json, or none.
Default value is none.
@item stats_file
Write stats to specified file. Format is controlled by @option{print_format},
which must be set. Specify @code{-} to write to standard output.
Default is unset.
@end table
@section lowpass

43
libavfilter/af_loudnorm.c
View File

@@ -20,6 +20,8 @@
/* http://k.ylo.ph/2016/04/04/loudnorm.html */
#include "libavutil/avstring.h"
#include "libavutil/file_open.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
@@ -64,6 +66,7 @@ typedef struct LoudNormContext {
int linear;
int dual_mono;
enum PrintFormat print_format;
char *stats_file_str;
double *buf;
int buf_size;
@@ -121,6 +124,7 @@ static const AVOption loudnorm_options[] = {
{ "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = NONE}, 0, 0, FLAGS, .unit = "print_format" },
{ "json", 0, 0, AV_OPT_TYPE_CONST, {.i64 = JSON}, 0, 0, FLAGS, .unit = "print_format" },
{ "summary", 0, 0, AV_OPT_TYPE_CONST, {.i64 = SUMMARY}, 0, 0, FLAGS, .unit = "print_format" },
{ "stats_file", "set stats output file", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
{ NULL }
};
@@ -803,6 +807,11 @@ static av_cold int init(AVFilterContext *ctx)
LoudNormContext *s = ctx->priv;
s->frame_type = FIRST_FRAME;
if (s->stats_file_str && s->print_format == NONE) {
av_log(ctx, AV_LOG_ERROR, "stats_file requested but print_format not specified\n");
return AVERROR(EINVAL);
}
if (s->linear) {
double offset, offset_tp;
offset = s->target_i - s->measured_i;
@@ -824,6 +833,8 @@ static av_cold void uninit(AVFilterContext *ctx)
LoudNormContext *s = ctx->priv;
double i_in, i_out, lra_in, lra_out, thresh_in, thresh_out, tp_in, tp_out;
int c;
FILE *stats_file = NULL;
char *stats = NULL;
if (!s->r128_in || !s->r128_out)
goto end;
@@ -848,13 +859,28 @@ static av_cold void uninit(AVFilterContext *ctx)
tp_out = tmp;
}
if (s->stats_file_str) {
if (!strcmp(s->stats_file_str, "-")) {
stats_file = stdout;
} else {
stats_file = avpriv_fopen_utf8(s->stats_file_str, "w");
if (!stats_file) {
int err = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
s->stats_file_str, av_err2str(err));
goto end;
}
}
}
switch(s->print_format) {
case NONE:
break;
case JSON:
av_log(ctx, AV_LOG_INFO,
"\n{\n"
stats = av_asprintf(
"{\n"
"\t\"input_i\" : \"%.2f\",\n"
"\t\"input_tp\" : \"%.2f\",\n"
"\t\"input_lra\" : \"%.2f\",\n"
@@ -877,11 +903,13 @@ static av_cold void uninit(AVFilterContext *ctx)
s->frame_type == LINEAR_MODE ? "linear" : "dynamic",
s->target_i - i_out
);
av_log(ctx, AV_LOG_INFO, "\n%s", stats);
if (stats_file)
fprintf(stats_file, "%s", stats);
break;
case SUMMARY:
av_log(ctx, AV_LOG_INFO,
"\n"
stats = av_asprintf(
"Input Integrated: %+6.1f LUFS\n"
"Input True Peak: %+6.1f dBTP\n"
"Input LRA: %6.1f LU\n"
@@ -905,10 +933,17 @@ static av_cold void uninit(AVFilterContext *ctx)
s->frame_type == LINEAR_MODE ? "Linear" : "Dynamic",
s->target_i - i_out
);
av_log(ctx, AV_LOG_INFO, "\n%s", stats);
if (stats_file)
fprintf(stats_file, "%s", stats);
break;
}
end:
if (stats)
av_free(stats);
if (stats_file && stats_file != stdout)
fclose(stats_file);
if (s->r128_in)
ff_ebur128_destroy(&s->r128_in);
if (s->r128_out)