[FFmpeg-devel] [PATCH] avfilter: add multiband compand filter
Michael Niedermayer
michael at niedermayer.cc
Sun May 14 04:40:40 EEST 2017
On Sat, May 13, 2017 at 10:05:35PM +0200, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> ---
> doc/filters.texi | 16 ++
> libavfilter/Makefile | 1 +
> libavfilter/af_mcompand.c | 672 ++++++++++++++++++++++++++++++++++++++++++++++
> libavfilter/allfilters.c | 1 +
> 4 files changed, 690 insertions(+)
> create mode 100644 libavfilter/af_mcompand.c
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 5985db6..189831f 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -3064,6 +3064,22 @@ lowpass=c=LFE
> @end example
> @end itemize
>
> + at section mcompand
> +Multiband Compress or expand the audio's dynamic range.
> +
> +The input audio is divided into bands using 4th order Linkwitz-Riley IIRs.
> +This is akin to the crossover of a loudspeaker, and results in flat frequency
> +response when absent compander action.
> +
> +It accepts the following parameters:
> +
> + at table @option
> + at item args
> +This option syntax is:
> +attack,decay,{attack,decay..} soft-knee points crossover_frequency [delay [initial_volume [gain]]] | attack,decay ...
> +For explanation of each item refer to compand filter documentation.
> + at end table
> +
> @anchor{pan}
> @section pan
this fails to build
doc/filters.texi:3079: misplaced {
doc/filters.texi:3079: misplaced }
doc/filters.texi:3079: misplaced {
doc/filters.texi:3079: misplaced }
make: *** [doc/ffplay-all.html] Error 1
make: *** Waiting for unfinished jobs....
make: *** [doc/ffprobe-all.html] Error 1
doc/filters.texi:3079: misplaced {
doc/filters.texi:3079: misplaced }
make: *** [doc/ffserver-all.html] Error 1
doc/filters.texi:3079: misplaced {
doc/filters.texi:3079: misplaced }
make: *** [doc/ffmpeg-all.html] Error 1
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Modern terrorism, a quick summary: Need oil, start war with country that
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people, be surprised about them taking revenge and drop even more bombs
and strip your own citizens of their rights and freedoms. to be continued
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