.\" Automatically generated by Pod::Man 2.22 (Pod::Simple 3.13)
|
.\"
|
.\" Standard preamble:
|
.\" ========================================================================
|
.de Sp \" Vertical space (when we can't use .PP)
|
.if t .sp .5v
|
.if n .sp
|
..
|
.de Vb \" Begin verbatim text
|
.ft CW
|
.nf
|
.ne \\$1
|
..
|
.de Ve \" End verbatim text
|
.ft R
|
.fi
|
..
|
.\" Set up some character translations and predefined strings. \*(-- will
|
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
|
.\" double quote, and \*(R" will give a right double quote. \*(C+ will
|
.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
|
.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
|
.\" nothing in troff, for use with C<>.
|
.tr \(*W-
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
.ie n \{\
|
. ds -- \(*W-
|
. ds PI pi
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
. ds L" ""
|
. ds R" ""
|
. ds C` ""
|
. ds C' ""
|
'br\}
|
.el\{\
|
. ds -- \|\(em\|
|
. ds PI \(*p
|
. ds L" ``
|
. ds R" ''
|
'br\}
|
.\"
|
.\" Escape single quotes in literal strings from groff's Unicode transform.
|
.ie \n(.g .ds Aq \(aq
|
.el .ds Aq '
|
.\"
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
.\" output yourself in some meaningful fashion.
|
.ie \nF \{\
|
. de IX
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
..
|
. nr % 0
|
. rr F
|
.\}
|
.el \{\
|
. de IX
|
..
|
.\}
|
.\"
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
. \" fudge factors for nroff and troff
|
.if n \{\
|
. ds #H 0
|
. ds #V .8m
|
. ds #F .3m
|
. ds #[ \f1
|
. ds #] \fP
|
.\}
|
.if t \{\
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
. ds #V .6m
|
. ds #F 0
|
. ds #[ \&
|
. ds #] \&
|
.\}
|
. \" simple accents for nroff and troff
|
.if n \{\
|
. ds ' \&
|
. ds ` \&
|
. ds ^ \&
|
. ds , \&
|
. ds ~ ~
|
. ds /
|
.\}
|
.if t \{\
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
.\}
|
. \" troff and (daisy-wheel) nroff accents
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
. \" corrections for vroff
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
. \" for low resolution devices (crt and lpr)
|
.if \n(.H>23 .if \n(.V>19 \
|
\{\
|
. ds : e
|
. ds 8 ss
|
. ds o a
|
. ds d- d\h'-1'\(ga
|
. ds D- D\h'-1'\(hy
|
. ds th \o'bp'
|
. ds Th \o'LP'
|
. ds ae ae
|
. ds Ae AE
|
.\}
|
.rm #[ #] #H #V #F C
|
.\" ========================================================================
|
.\"
|
.IX Title "doc::libswresample 3"
|
.TH doc::libswresample 3 " " " " " "
|
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
|
.\" way too many mistakes in technical documents.
|
.if n .ad l
|
.nh
|
.SH "NAME"
|
libswresample \- audio resampling library
|
.SH "DESCRIPTION"
|
.IX Header "DESCRIPTION"
|
The libswresample library performs highly optimized audio resampling,
|
rematrixing and sample format conversion operations.
|
.PP
|
Specifically, this library performs the following conversions:
|
.IP "\(bu" 4
|
\&\fIResampling\fR: is the process of changing the audio rate, for
|
example from a high sample rate of 44100Hz to 8000Hz. Audio
|
conversion from high to low sample rate is a lossy process. Several
|
resampling options and algorithms are available.
|
.IP "\(bu" 4
|
\&\fIFormat conversion\fR: is the process of converting the type of
|
samples, for example from 16\-bit signed samples to unsigned 8\-bit or
|
float samples. It also handles packing conversion, when passing from
|
packed layout (all samples belonging to distinct channels interleaved
|
in the same buffer), to planar layout (all samples belonging to the
|
same channel stored in a dedicated buffer or \*(L"plane\*(R").
|
.IP "\(bu" 4
|
\&\fIRematrixing\fR: is the process of changing the channel layout, for
|
example from stereo to mono. When the input channels cannot be mapped
|
to the output streams, the process is lossy, since it involves
|
different gain factors and mixing.
|
.PP
|
Various other audio conversions (e.g. stretching and padding) are
|
enabled through dedicated options.
|
.SH "SEE ALSO"
|
.IX Header "SEE ALSO"
|
\&\fIffmpeg\fR\|(1), \fIffplay\fR\|(1), \fIffprobe\fR\|(1),
|
\&\fIffmpeg\-resampler\fR\|(1),
|
\&\fIlibavutil\fR\|(3)
|
.SH "AUTHORS"
|
.IX Header "AUTHORS"
|
The FFmpeg developers.
|
.PP
|
For details about the authorship, see the Git history of the project
|
(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command
|
\&\fBgit log\fR in the FFmpeg source directory, or browsing the
|
online repository at <\fBhttp://source.ffmpeg.org\fR>.
|
.PP
|
Maintainers for the specific components are listed in the file
|
\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.
|
