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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 9d18880913..9ff7bc2814 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -1183,7 +1183,7 @@ afftfilt="real='hypot(re,im)*cos((random(0)*2-1)*2*3.14)':imag='hypot(re,im)*sin @anchor{afir} @section afir -Apply an arbitrary Frequency Impulse Response filter. +Apply an arbitrary Finite Impulse Response filter. This filter is designed for applying long FIR filters, up to 60 seconds long. @@ -1192,10 +1192,10 @@ It can be used as component for digital crossover filters, room equalization, cross talk cancellation, wavefield synthesis, auralization, ambiophonics, ambisonics and spatialization. -This filter uses the second stream as FIR coefficients. -If the second stream holds a single channel, it will be used +This filter uses the streams higher than first one as FIR coefficients. +If the non-first stream holds a single channel, it will be used for all input channels in the first stream, otherwise -the number of channels in the second stream must be same as +the number of channels in the non-first stream must be same as the number of channels in the first stream. It accepts the following parameters: @@ -1264,6 +1264,15 @@ Lower values decreases latency at cost of higher CPU usage. Set maximal partition size used for convolution. Default is @var{8192}. Allowed range is from @var{8} to @var{32768}. Lower values may increase CPU usage. + +@item nbirs +Set number of input impulse responses streams which will be switchable at runtime. +Allowed range is from @var{1} to @var{32}. Default is @var{1}. + +@item ir +Set IR stream which will be used for convolution, starting from @var{0}, should always be +lower than supplied value by @code{nbirs} option. Default is @var{0}. +This option can be changed at runtime via @ref{commands}. @end table @subsection Examples |