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avfilter: add lowshelf and highshelf filters

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These are old bass and treble filters.
Make bass and treble filters better at boosting.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2018-04-17 11:31:34 +02:00
parent d10cefbfe5
commit 2fc12f4971
5 changed files with 76 additions and 12 deletions
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4
doc/filters.texi
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@ -2057,7 +2057,7 @@ Change bandreject width.
Syntax for the command is : "@var{width}"
@end table
@section bass
@section bass, lowshelf
Boost or cut the bass (lower) frequencies of the audio using a two-pole
shelving filter with a response similar to that of a standard
@ -4432,7 +4432,7 @@ Set LFE input volume. By default, this is @var{1}.
Set LFE output volume. By default, this is @var{1}.
@end table
@section treble
@section treble, highshelf
Boost or cut treble (upper) frequencies of the audio using a two-pole
shelving filter with a response similar to that of a standard

2
libavfilter/Makefile
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@ -99,10 +99,12 @@ OBJS-$(CONFIG_HAAS_FILTER) += af_haas.o
OBJS-$(CONFIG_HDCD_FILTER) += af_hdcd.o
OBJS-$(CONFIG_HEADPHONE_FILTER) += af_headphone.o
OBJS-$(CONFIG_HIGHPASS_FILTER) += af_biquads.o
OBJS-$(CONFIG_HIGHSHELF_FILTER) += af_biquads.o
OBJS-$(CONFIG_JOIN_FILTER) += af_join.o
OBJS-$(CONFIG_LADSPA_FILTER) += af_ladspa.o
OBJS-$(CONFIG_LOUDNORM_FILTER) += af_loudnorm.o ebur128.o
OBJS-$(CONFIG_LOWPASS_FILTER) += af_biquads.o
OBJS-$(CONFIG_LOWSHELF_FILTER) += af_biquads.o
OBJS-$(CONFIG_LV2_FILTER) += af_lv2.o
OBJS-$(CONFIG_MCOMPAND_FILTER) += af_mcompand.o
OBJS-$(CONFIG_PAN_FILTER) += af_pan.o

78
libavfilter/af_biquads.c
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@ -78,6 +78,8 @@ enum FilterType {
allpass,
highpass,
lowpass,
lowshelf,
highshelf,
};
enum WidthType {
@ -245,7 +247,7 @@ static int config_filter(AVFilterLink *outlink, int reset)
AVFilterLink *inlink = ctx->inputs[0];
double A = exp(s->gain / 40 * log(10.));
double w0 = 2 * M_PI * s->frequency / inlink->sample_rate;
double alpha;
double alpha, beta;
if (w0 > M_PI) {
av_log(ctx, AV_LOG_ERROR,
@ -277,6 +279,8 @@ static int config_filter(AVFilterLink *outlink, int reset)
av_assert0(0);
}
beta = 2 * sqrt(A);
switch (s->filter_type) {
case biquad:
break;
@ -289,20 +293,24 @@ static int config_filter(AVFilterLink *outlink, int reset)
s->b2 = 1 - alpha * A;
break;
case bass:
s->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
beta = sqrt((A * A + 1) - (A - 1) * (A - 1));
case lowshelf:
s->a0 = (A + 1) + (A - 1) * cos(w0) + beta * alpha;
s->a1 = -2 * ((A - 1) + (A + 1) * cos(w0));
s->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
s->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
s->a2 = (A + 1) + (A - 1) * cos(w0) - beta * alpha;
s->b0 = A * ((A + 1) - (A - 1) * cos(w0) + beta * alpha);
s->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0));
s->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
s->b2 = A * ((A + 1) - (A - 1) * cos(w0) - beta * alpha);
break;
case treble:
s->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
beta = sqrt((A * A + 1) - (A - 1) * (A - 1));
case highshelf:
s->a0 = (A + 1) - (A - 1) * cos(w0) + beta * alpha;
s->a1 = 2 * ((A - 1) - (A + 1) * cos(w0));
s->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
s->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
s->a2 = (A + 1) - (A - 1) * cos(w0) - beta * alpha;
s->b0 = A * ((A + 1) + (A - 1) * cos(w0) + beta * alpha);
s->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0));
s->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
s->b2 = A * ((A + 1) + (A - 1) * cos(w0) - beta * alpha);
break;
case bandpass:
if (s->csg) {
@ -459,6 +467,8 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
if ((!strcmp(cmd, "frequency") || !strcmp(cmd, "f")) &&
(s->filter_type == equalizer ||
s->filter_type == lowshelf ||
s->filter_type == highshelf ||
s->filter_type == bass ||
s->filter_type == treble ||
s->filter_type == bandpass ||
@ -476,6 +486,8 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
s->frequency = freq;
} else if ((!strcmp(cmd, "gain") || !strcmp(cmd, "g")) &&
(s->filter_type == equalizer ||
s->filter_type == lowshelf ||
s->filter_type == highshelf ||
s->filter_type == bass ||
s->filter_type == treble)) {
double gain;
@ -488,6 +500,8 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
s->gain = gain;
} else if ((!strcmp(cmd, "width") || !strcmp(cmd, "w")) &&
(s->filter_type == equalizer ||
s->filter_type == lowshelf ||
s->filter_type == highshelf ||
s->filter_type == bass ||
s->filter_type == treble ||
s->filter_type == bandpass ||
@ -505,6 +519,8 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
s->width = width;
} else if ((!strcmp(cmd, "width_type") || !strcmp(cmd, "t")) &&
(s->filter_type == equalizer ||
s->filter_type == lowshelf ||
s->filter_type == highshelf ||
s->filter_type == bass ||
s->filter_type == treble ||
s->filter_type == bandpass ||
@ -784,6 +800,50 @@ static const AVOption allpass_options[] = {
DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter.");
#endif /* CONFIG_ALLPASS_FILTER */
#if CONFIG_LOWSHELF_FILTER
static const AVOption lowshelf_options[] = {
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
{"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
{"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
{"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{NULL}
};
DEFINE_BIQUAD_FILTER(lowshelf, "Apply a low shelf filter.");
#endif /* CONFIG_LOWSHELF_FILTER */
#if CONFIG_HIGHSHELF_FILTER
static const AVOption highshelf_options[] = {
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
{"t", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, NB_WTYPE-1, FLAGS, "width_type"},
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
{"k", "kHz", 0, AV_OPT_TYPE_CONST, {.i64=KHERTZ}, 0, 0, FLAGS, "width_type"},
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
{"channels", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{"c", "set channels to filter", OFFSET(channels), AV_OPT_TYPE_CHANNEL_LAYOUT, {.i64=-1}, INT64_MIN, INT64_MAX, FLAGS},
{NULL}
};
DEFINE_BIQUAD_FILTER(highshelf, "Apply a high shelf filter.");
#endif /* CONFIG_HIGHSHELF_FILTER */
#if CONFIG_BIQUAD_FILTER
static const AVOption biquad_options[] = {
{"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT32_MIN, INT32_MAX, FLAGS},

2
libavfilter/allfilters.c
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@ -94,10 +94,12 @@ extern AVFilter ff_af_haas;
extern AVFilter ff_af_hdcd;
extern AVFilter ff_af_headphone;
extern AVFilter ff_af_highpass;
extern AVFilter ff_af_highshelf;
extern AVFilter ff_af_join;
extern AVFilter ff_af_ladspa;
extern AVFilter ff_af_loudnorm;
extern AVFilter ff_af_lowpass;
extern AVFilter ff_af_lowshelf;
extern AVFilter ff_af_lv2;
extern AVFilter ff_af_mcompand;
extern AVFilter ff_af_pan;

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 17
#define LIBAVFILTER_VERSION_MINOR 18
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \