Commit d85284d4 authored by Michael Niedermayer's avatar Michael Niedermayer

Merge commit 'a17ab0e4'

* commit 'a17ab0e4':
  doc: add decoders.texi

Conflicts:
	doc/decoders.texi
	doc/ffmpeg.texi
	doc/ffplay.texi

See: 5e45f034Merged-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parents 3c7195a9 a17ab0e4
...@@ -14,7 +14,7 @@ You can disable all the decoders with the configure option ...@@ -14,7 +14,7 @@ You can disable all the decoders with the configure option
with the options @code{--enable-decoder=@var{DECODER}} / with the options @code{--enable-decoder=@var{DECODER}} /
@code{--disable-decoder=@var{DECODER}}. @code{--disable-decoder=@var{DECODER}}.
The option @code{-codecs} of the ff* tools will display the list of The option @code{-decoders} of the ff* tools will display the list of
enabled decoders. enabled decoders.
@c man end DECODERS @c man end DECODERS
...@@ -52,6 +52,37 @@ top-field-first is assumed ...@@ -52,6 +52,37 @@ top-field-first is assumed
@chapter Audio Decoders @chapter Audio Decoders
@c man begin AUDIO DECODERS @c man begin AUDIO DECODERS
A description of some of the currently available audio decoders
follows.
@section ac3
AC-3 audio decoder.
This decoder implements part of ATSC A/52:2010 and ETSI TS 102 366, as well as
the undocumented RealAudio 3 (a.k.a. dnet).
@subsubsection AC-3 Decoder Options
@table @option
@item -drc_scale @var{value}
Dynamic Range Scale Factor. The factor to apply to dynamic range values
from the AC-3 stream. This factor is applied exponentially.
There are 3 notable scale factor ranges:
@table @option
@item drc_scale == 0
DRC disabled. Produces full range audio.
@item 0 < drc_scale <= 1
DRC enabled. Applies a fraction of the stream DRC value.
Audio reproduction is between full range and full compression.
@item drc_scale > 1
DRC enabled. Applies drc_scale asymmetrically.
Loud sounds are fully compressed. Soft sounds are enhanced.
@end table
@end table
@section ffwavesynth @section ffwavesynth
Internal wave synthetizer. Internal wave synthetizer.
......
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