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avfilter/ebur128: add dualmono measurement option

This commit is contained in:
Kyle Swanson 2015-09-30 10:35:08 -05:00 committed by Clément Bœsch
parent a2b8b16300
commit 4f721bfd46
2 changed files with 31 additions and 0 deletions
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9
doc/filters.texi
View File

@ -12685,6 +12685,15 @@ stream for better peak accuracy. It logs a message for true-peak.
This mode requires a build with @code{libswresample}.
@end table
@item dualmono
Treat mono input files as "dual mono". If a mono file is intended for playback
on a stereo system, its EBU R128 measurement will be perceptually incorrect.
If set to @code{true}, this option will compensate for this effect.
Multi-channel input files are not effected by this option.
@item panlaw
Set a specific pan law to be used for the measurement of dual mono files.
This parameter is optional, and has a default value of -3.01dB.
@end table
@subsection Examples

22
libavfilter/f_ebur128.c
View File

@ -139,6 +139,8 @@ typedef struct {
/* misc */
int loglevel; ///< log level for frame logging
int metadata; ///< whether or not to inject loudness results in frames
int dual_mono; ///< whether or not to treat single channel input files as dual-mono
double pan_law; ///< pan law value used to calulate dual-mono measurements
} EBUR128Context;
enum {
@ -163,6 +165,8 @@ static const AVOption ebur128_options[] = {
{ "none", "disable any peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_NONE}, INT_MIN, INT_MAX, A|F, "mode" },
{ "sample", "enable peak-sample mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_SAMPLES_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" },
{ "true", "enable true-peak mode", 0, AV_OPT_TYPE_CONST, {.i64 = PEAK_MODE_TRUE_PEAKS}, INT_MIN, INT_MAX, A|F, "mode" },
{ "dualmono", "treat mono input files as dual-mono", OFFSET(dual_mono), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, A|F },
{ "panlaw", "set a specific pan law for dual-mono files", OFFSET(pan_law), AV_OPT_TYPE_DOUBLE, {.dbl = -3.01029995663978}, -10.0, 0.0, A|F },
{ NULL },
};
@ -661,6 +665,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
}
if (nb_integrated)
ebur128->integrated_loudness = LOUDNESS(integrated_sum / nb_integrated);
/* dual-mono correction */
if (nb_channels == 1 && ebur128->dual_mono) {
ebur128->integrated_loudness -= ebur128->pan_law;
}
}
/* LRA */
@ -707,6 +715,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
}
}
/* dual-mono correction */
if (nb_channels == 1 && ebur128->dual_mono) {
loudness_400 -= ebur128->pan_law;
loudness_3000 -= ebur128->pan_law;
}
#define LOG_FMT "M:%6.1f S:%6.1f I:%6.1f LUFS LRA:%6.1f LU"
/* push one video frame */
@ -855,6 +869,14 @@ static av_cold void uninit(AVFilterContext *ctx)
int i;
EBUR128Context *ebur128 = ctx->priv;
/* dual-mono correction */
if (ebur128->nb_channels == 1 && ebur128->dual_mono) {
ebur128->i400.rel_threshold -= ebur128->pan_law;
ebur128->i3000.rel_threshold -= ebur128->pan_law;
ebur128->lra_low -= ebur128->pan_law;
ebur128->lra_high -= ebur128->pan_law;
}
av_log(ctx, AV_LOG_INFO, "Summary:\n\n"
" Integrated loudness:\n"
" I: %5.1f LUFS\n"