lavfi/loudnorm: add an internal libebur128 library

Also contains the following changes to the library:
- add ff_ prefix to functions
- remove cplusplus defines.
- add FF_ prefix to contants and some structs
- remove true peak calculation feature, since it uses its own resampler, and
  af_loudnorm does not need it.
- remove version info and some fprintf(stderr) functions
- convert to use av_malloc
- always use histogram mode for LRA calculation, otherwise LRA data is slowly
  consuming memory making af_loudnorm unfit for 24/7 operation. It also uses a
  BSD style linked list implementation which is probably not available on all
  platforms. So let's just remove the classic mode which not uses histogram.
- add ff_thread_once for calculating static histogram tables
- convert some functions to void which cannot fail
- remove intrinsics and some unused headers
- add support for planar audio
- remove channel / sample rate changer function, in ffmpeg usually we simply
  alloc a new context
- convert some static variables to defines
- declare static histogram variables as aligned
- convert some initalizations to mallocz
- add window size parameter to init function and remove window size setter
  function
- convert return codes to AVERROR
- fix indentation

Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 0 insertions, 3 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 5bced37c4d..d1ee6f4c3e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2921,9 +2921,6 @@ EBU R128 loudness normalization. Includes both dynamic and linear normalization
 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