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Code Issues Releases Activity

avfilter/af_replaygain: export results into read-only options

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This commit is contained in:
Paul B Mahol 2023-05-06 01:50:08 +02:00
parent 782ea8b2e5
commit 7153642992
2 changed files with 42 additions and 5 deletions
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10
doc/filters.texi
View File

@ -6058,6 +6058,16 @@ ReplayGain scanner filter. This filter takes an audio stream as an input and
outputs it unchanged.
At end of filtering it displays @code{track_gain} and @code{track_peak}.
The filter accepts the following exported read-only options:
@table @option
@item track_gain
Exported track gain in dB at end of stream.
@item track_peak
Exported track peak at end of stream.
@end table
@section resample
Convert the audio sample format, sample rate and channel layout. It is

37
libavfilter/af_replaygain.c
View File

@ -23,8 +23,11 @@
* ReplayGain scanner
*/
#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
@ -306,8 +309,11 @@ static const ReplayGainFreqInfo freqinfos[] =
};
typedef struct ReplayGainContext {
const AVClass *class;
uint32_t histogram[HISTOGRAM_SLOTS];
float peak;
float gain;
int yule_hist_i, butter_hist_i;
const double *yule_coeff_a;
const double *yule_coeff_b;
@ -576,13 +582,22 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
return ff_filter_frame(outlink, in);
}
static av_cold void uninit(AVFilterContext *ctx)
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ReplayGainContext *s = ctx->priv;
float gain = calc_replaygain(s->histogram);
int ret = 0;
av_log(ctx, AV_LOG_INFO, "track_gain = %+.2f dB\n", gain);
av_log(ctx, AV_LOG_INFO, "track_peak = %.6f\n", s->peak);
ret = ff_request_frame(ctx->inputs[0]);
if (ret == AVERROR_EOF) {
s->gain = calc_replaygain(s->histogram);
av_log(ctx, AV_LOG_INFO, "track_gain = %+.2f dB\n", s->gain);
av_log(ctx, AV_LOG_INFO, "track_peak = %.6f\n", s->peak);
}
return ret;
}
static const AVFilterPad replaygain_inputs[] = {
@ -598,14 +613,26 @@ static const AVFilterPad replaygain_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.request_frame = request_frame,
},
};
#define OFFSET(x) offsetof(ReplayGainContext, x)
#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_EXPORT|AV_OPT_FLAG_READONLY
static const AVOption replaygain_options[] = {
{ "track_gain", "track gain (dB)", OFFSET(gain), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
{ "track_peak", "track peak", OFFSET(peak), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(replaygain);
const AVFilter ff_af_replaygain = {
.name = "replaygain",
.description = NULL_IF_CONFIG_SMALL("ReplayGain scanner."),
.uninit = uninit,
.priv_size = sizeof(ReplayGainContext),
.priv_class = &replaygain_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(replaygain_inputs),
FILTER_OUTPUTS(replaygain_outputs),