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lavfi: add atempo filter 

Add atempo audio filter for adjusting audio tempo without affecting
pitch. This filter implements WSOLA algorithm with fast cross
correlation calculation in frequency domain.

Signed-off-by: Pavel Koshevoy <pavel@homestead.aragog.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
This commit is contained in:
Pavel Koshevoy 2012-06-17 12:35:57 +02:00 committed by Stefano Sabatini
parent bc4da77b08
commit a1aac8d004
8 changed files with 1185 additions and 1 deletions
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1
Changelog
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@ -7,6 +7,7 @@ version next:
- Indeo Audio decoder
- channelsplit audio filter
- setnsamples audio filter
- atempo filter
version 0.11:

1
MAINTAINERS
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@ -275,6 +275,7 @@ Video filters:
graphdump.c Nicolas George
af_amerge.c Nicolas George
af_astreamsync.c Nicolas George
af_atempo.c Pavel Koshevoy
af_pan.c Nicolas George
vsrc_mandelbrot.c Michael Niedermayer
vf_yadif.c Michael Niedermayer

1
configure vendored
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@ -1702,6 +1702,7 @@ amovie_filter_deps="avcodec avformat"
aresample_filter_deps="swresample"
ass_filter_deps="libass"
asyncts_filter_deps="avresample"
atempo_filter_deps="avcodec"
blackframe_filter_deps="gpl"
boxblur_filter_deps="gpl"
colormatrix_filter_deps="gpl"

18
doc/filters.texi
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@ -406,6 +406,24 @@ amovie=file.ogg [a] ; amovie=file.mp3 [b] ;
[a2] [b2] amerge
@end example
@section atempo
Adjust audio tempo.
The filter accepts exactly one parameter, the audio tempo. If not
specified then the filter will assume nominal 1.0 tempo. Tempo must
be in the [0.5, 2.0] range.
For example, to slow down audio to 80% tempo:
@example
atempo=0.8
@end example
For example, to speed up audio to 125% tempo:
@example
atempo=1.25
@end example
@section earwax
Make audio easier to listen to on headphones.

2
libavfilter/Makefile
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@ -9,6 +9,7 @@ FFLIBS-$(CONFIG_SCALE_FILTER) += swscale
FFLIBS-$(CONFIG_ACONVERT_FILTER) += swresample
FFLIBS-$(CONFIG_AMOVIE_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_ARESAMPLE_FILTER) += swresample
FFLIBS-$(CONFIG_ATEMPO_FILTER) += avcodec
FFLIBS-$(CONFIG_MOVIE_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_PAN_FILTER) += swresample
FFLIBS-$(CONFIG_REMOVELOGO_FILTER) += avformat avcodec
@ -56,6 +57,7 @@ OBJS-$(CONFIG_ASHOWINFO_FILTER) += af_ashowinfo.o
OBJS-$(CONFIG_ASPLIT_FILTER) += split.o
OBJS-$(CONFIG_ASTREAMSYNC_FILTER) += af_astreamsync.o
OBJS-$(CONFIG_ASYNCTS_FILTER) += af_asyncts.o
OBJS-$(CONFIG_ATEMPO_FILTER) += af_atempo.o
OBJS-$(CONFIG_CHANNELSPLIT_FILTER) += af_channelsplit.o
OBJS-$(CONFIG_EARWAX_FILTER) += af_earwax.o
OBJS-$(CONFIG_PAN_FILTER) += af_pan.o

1160
libavfilter/af_atempo.c Normal file
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1
libavfilter/allfilters.c
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@ -45,6 +45,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (ASPLIT, asplit, af);
REGISTER_FILTER (ASTREAMSYNC, astreamsync, af);
REGISTER_FILTER (ASYNCTS, asyncts, af);
REGISTER_FILTER (ATEMPO, atempo, af);
REGISTER_FILTER (CHANNELSPLIT,channelsplit,af);
REGISTER_FILTER (EARWAX, earwax, af);
REGISTER_FILTER (PAN, pan, af);

2
libavfilter/version.h
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@ -29,7 +29,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 2
#define LIBAVFILTER_VERSION_MINOR 80
#define LIBAVFILTER_VERSION_MINOR 81
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \