avfilter: add loudnorm

Signed-off-by: Kyle Swanson <k@ylo.ph>

Changelog

@@ -35,6 +35,7 @@ version <next>:
 - Generic OpenMAX IL encoder with support for Raspberry Pi
 - IFF ANIM demuxer & decoder
 - Direct Stream Transfer (DST) decoder
+- loudnorm filter
 
 version 3.0:
 - Common Encryption (CENC) MP4 encoding and decoding support

MAINTAINERS

@@ -358,6 +358,7 @@ Filters:
   af_compand.c                          Paul B Mahol
   af_firequalizer.c                     Muhammad Faiz
   af_ladspa.c                           Paul B Mahol
+  af_loudnorm.c                         Kyle Swanson
   af_pan.c                              Nicolas George
   af_sidechaincompress.c                Paul B Mahol
   af_silenceremove.c                    Paul B Mahol

configure

@@ -226,6 +226,8 @@ External library support:
   --enable-libcdio         enable audio CD grabbing with libcdio [no]
   --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394
                            and libraw1394 [no]
+  --enable-libebur128      enable libebur128 for EBU R128 measurement,
+                           needed for loudnorm filter [no]
   --enable-libfaac         enable AAC encoding via libfaac [no]
   --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]
   --enable-libflite        enable flite (voice synthesis) support via libflite [no]
@@ -1472,6 +1474,7 @@ EXTERNAL_LIBRARY_LIST="
     libcdio
     libcelt
     libdc1394
+    libebur128
     libfaac
     libfdk_aac
     libflite
@@ -2987,6 +2990,7 @@ hqdn3d_filter_deps="gpl"
 interlace_filter_deps="gpl"
 kerndeint_filter_deps="gpl"
 ladspa_filter_deps="ladspa dlopen"
+loudnorm_filter_deps="libebur128"
 mcdeint_filter_deps="avcodec gpl"
 movie_filter_deps="avcodec avformat"
 mpdecimate_filter_deps="gpl"
@@ -5593,6 +5597,7 @@ enabled libcelt           && require libcelt celt/celt.h celt_decode -lcelt0 &&
                              { check_lib celt/celt.h celt_decoder_create_custom -lcelt0 ||
                                die "ERROR: libcelt must be installed and version must be >= 0.11.0."; }
 enabled libcaca           && require_pkg_config caca caca.h caca_create_canvas
+enabled libebur128        && require ebur128 ebur128.h ebur128_relative_threshold -lebur128
 enabled libfaac           && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
 enabled libfdk_aac        && { use_pkg_config fdk-aac "fdk-aac/aacenc_lib.h" aacEncOpen ||
                                { require libfdk_aac fdk-aac/aacenc_lib.h aacEncOpen -lfdk-aac &&

doc/filters.texi

@@ -2711,6 +2711,61 @@ Modify the @var{N}-th control value.
 If the specified value is not valid, it is ignored and prior one is kept.
 @end table
 
+@section loudnorm
+
+EBU R128 loudness normalization. Includes both dynamic and linear normalization modes.
+Support for both single pass (livestreams, files) and double pass (files) modes.
+This algorithm can target IL, LRA, and maximum true peak.
+
+To enable compilation of this filter you need to configure FFmpeg with
+@code{--enable-libebur128}.
+
+The filter accepts the following options:
+
+@table @option
+@item I, i
+Set integrated loudness target.
+Range is -70.0 - -5.0. Default value is -24.0.
+
+@item LRA, lra
+Set loudness range target.
+Range is 1.0 - 20.0. Default value is 7.0.
+
+@item TP, tp
+Set maximum true peak.
+Range is -9.0 - +0.0. Default value is -2.0.
+
+@item measured_I, measured_i
+Measured IL of input file.
+Range is -99.0 - +0.0.
+
+@item measured_LRA, measured_lra
+Measured LRA of input file.
+Range is  0.0 - 99.0.
+
+@item measured_TP, measured_tp
+Measured true peak of input file.
+Range is  -99.0 - +99.0.
+
+@item measured_thresh
+Measured threshold of input file.
+Range is -99.0 - +0.0.
+
+@item offset
+Set offset gain. Gain is applied before the true-peak limiter.
+Range is  -99.0 - +99.0. Default is +0.0.
+
+@item linear
+Normalize linearly if possible.
+measured_I, measured_LRA, measured_TP, and measured_thresh must also
+to be specified in order to use this mode.
+Options are true or false. Default is true.
+
+@item print_format
+Set print format for stats. Options are summary, json, or none.
+Default value is none.
+@end table
+
 @section lowpass
 
 Apply a low-pass filter with 3dB point frequency.

libavfilter/Makefile

@@ -89,6 +89,7 @@ OBJS-$(CONFIG_FLANGER_FILTER)                += af_flanger.o generate_wave_table
 OBJS-$(CONFIG_HIGHPASS_FILTER)               += af_biquads.o
 OBJS-$(CONFIG_JOIN_FILTER)                   += af_join.o
 OBJS-$(CONFIG_LADSPA_FILTER)                 += af_ladspa.o
+OBJS-$(CONFIG_LOUDNORM_FILTER)               += af_loudnorm.o
 OBJS-$(CONFIG_LOWPASS_FILTER)                += af_biquads.o
 OBJS-$(CONFIG_PAN_FILTER)                    += af_pan.o
 OBJS-$(CONFIG_REPLAYGAIN_FILTER)             += af_replaygain.o

libavfilter/allfilters.c

@@ -108,6 +108,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(HIGHPASS,       highpass,       af);
     REGISTER_FILTER(JOIN,           join,           af);
     REGISTER_FILTER(LADSPA,         ladspa,         af);
+    REGISTER_FILTER(LOUDNORM,       loudnorm,       af);
     REGISTER_FILTER(LOWPASS,        lowpass,        af);
     REGISTER_FILTER(PAN,            pan,            af);
     REGISTER_FILTER(REPLAYGAIN,     replaygain,     af);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  45
+#define LIBAVFILTER_VERSION_MINOR  46
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \