[FFmpeg-cvslog] avfilter/af_biquads: add new normalize/n option
Paul B Mahol
git at videolan.org
Fri Nov 22 22:15:59 EET 2019
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri Nov 22 20:54:12 2019 +0100| [f46b04c4c32849a789a5aadc27fff3c3c60fc596] | committer: Paul B Mahol
avfilter/af_biquads: add new normalize/n option
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f46b04c4c32849a789a5aadc27fff3c3c60fc596
---
doc/filters.texi | 39 +++++++++++++++++++++++++++++++++++++++
libavfilter/af_biquads.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 21cb2a527d..4587356f1d 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1547,6 +1547,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@@ -2568,6 +2572,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@@ -2627,6 +2635,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@@ -2693,6 +2705,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@@ -2744,6 +2760,13 @@ Syntax for the command is : "@var{value}"
@item mix, m
How much to use filtered signal in output. Default is 1.
Range is between 0 and 1.
+
+ at item channels, c
+Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@section bs2b
@@ -3439,6 +3462,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Examples
@@ -3908,6 +3935,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
@@ -4224,6 +4255,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Examples
@@ -5332,6 +5367,10 @@ Range is between 0 and 1.
@item channels, c
Specify which channels to filter, by default all available are filtered.
+
+ at item normalize, n
+Normalize biquad coefficients, by default is disabled.
+Enabling it will normalize magnitude response at DC to 0dB.
@end table
@subsection Commands
diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index c0b2d73351..a2f7e3f061 100644
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -112,6 +112,7 @@ typedef struct BiquadsContext {
double width;
double mix;
uint64_t channels;
+ int normalize;
double a0, a1, a2;
double b0, b1, b2;
@@ -408,6 +409,14 @@ static int config_filter(AVFilterLink *outlink, int reset)
s->b2 /= s->a0;
s->a0 /= s->a0;
+ if (s->normalize && fabs(s->b0 + s->b1 + s->b2) > 1e-6) {
+ double factor = (s->a0 + s->a1 + s->a2) / (s->b0 + s->b1 + s->b2);
+
+ s->b0 *= factor;
+ s->b1 *= factor;
+ s->b2 *= factor;
+ }
+
s->cache = av_realloc_f(s->cache, sizeof(ChanCache), inlink->channels);
if (!s->cache)
return AVERROR(ENOMEM);
@@ -585,6 +594,8 @@ static const AVOption equalizer_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -609,6 +620,8 @@ static const AVOption bass_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -633,6 +646,8 @@ static const AVOption treble_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -656,6 +671,8 @@ static const AVOption bandpass_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -678,6 +695,8 @@ static const AVOption bandreject_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -702,6 +721,8 @@ static const AVOption lowpass_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -726,6 +747,8 @@ static const AVOption highpass_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -748,6 +771,8 @@ static const AVOption allpass_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -772,6 +797,8 @@ static const AVOption lowshelf_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -796,6 +823,8 @@ static const AVOption highshelf_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
@@ -813,6 +842,8 @@ static const AVOption biquad_options[] = {
{"m", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, 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},
+ {"normalize", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
+ {"n", "normalize coefficients", OFFSET(normalize), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{NULL}
};
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