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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/filters.texi | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 1dc222a119..e6e187dec0 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -14,6 +14,40 @@ Pass the audio source unchanged to the output. @c man end AUDIO FILTERS +@chapter Audio Sources +@c man begin AUDIO SOURCES + +Below is a description of the currently available audio sources. + +@section anullsrc + +Null audio source, never return audio frames. It is mainly useful as a +template and to be employed in analysis / debugging tools. + +It accepts as optional parameter a string of the form +@var{sample_rate}:@var{channel_layout}. + +@var{sample_rate} specify the sample rate, and defaults to 44100. + +@var{channel_layout} specify the channel layout, and can be either an +integer or a string representing a channel layout. The default value +of @var{channel_layout} is 3, which corresponds to CH_LAYOUT_STEREO. + +Check the channel_layout_map definition in +@file{libavcodec/audioconvert.c} for the correspondance between string +and channel layout values. + +Follow some examples: +@example +# set the sample rate to 48000 Hz and the channel layout to CH_LAYOUT_MONO. +anullsrc=48000:4 + +# same as +anullsrc=48000:mono +@end example + +@c man end AUDIO SOURCES + @chapter Video Filters @c man begin VIDEO FILTERS |