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* Add special case for 2nd-order IIR filter.Justin Ruggles2011-01-28
| | | | | 40% faster in ff_iir_filter_flt() when c->order == 2. (cherry picked from commit 37cb3eb53449ccefbbe8ea7dc5e66f9036aafe6e)
* 10l: reverse the biquad coefficients.Justin Ruggles2011-01-23
| | | | | | | I did not notice that the filter implementation uses a reversed history state. Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net> (cherry picked from commit 98cfadd648bfb2ab48e4c18d832e946a1ba050c8)
* iir: Change dst param to float* in ff_iir_filter_flt().Justin Ruggles2011-01-23
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 69915b48d6a787e569826eecb6c3b34ec19aeccd)
* iir: change filter type if/else to a switch.Justin Ruggles2011-01-21
| | | | | | | Simplifies error handling and makes it easier to add additional filter types. Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 0361d13cf3956dcf38f31b9df97aca9301cdc86a)
* Add biquad high-pass and low-pass IIR filters.Justin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit fcdf0a43cd267c1d4193aa172b024f35903c286e)
* Split out Butterworth filter coeff init to a separate function.Justin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 30112adadf06fe2f9500e4da365eb8a58095c940)
* cosmetics: vertical alignment and line wrapJustin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 75b98610a7ce7acf34f583a04aaccd8c619947fe)
* Add memory allocation failure checks to ff_iir_filter_init_coeffs().Justin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit d42dc217ed2b0f886ffc50b26c2bbff1fee5feca)
* cosmetics: wrap long lineJustin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit ebb230279aa0ecc2fda4c617860eb354531d4b63)
* Add function ff_iir_filter_flt() to accept floating-point input and output.Justin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit 0a3d7697b4fcb62305cd4a893b621a406a029ff0)
* Fix use of sstep/dstep in ff_iir_filter().Justin Ruggles2011-01-21
| | | | | Signed-off-by: Mans Rullgard <mans@mansr.com> (cherry picked from commit c3897d7690fffe016de8ed56fdbdb9d685dbcce2)
* Remove explicit filename from Doxygen @file commands.Diego Biurrun2010-04-20
| | | | | | | | Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk
* IIR filter test program.Alex Converse2009-07-16
| | | | Originally committed as revision 19443 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Mark iir filter init and free functions av_cold.Alex Converse2009-07-10
| | | | Originally committed as revision 19398 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Fix "iirfilter.c:55: warning: unused variable ‘size’"Alex Converse2009-07-10
| | | | Originally committed as revision 19397 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Eliminate use of complex.h from iirfilter.cAlex Converse2009-07-10
| | | | Originally committed as revision 19396 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Fix declarations of complex numbersMåns Rullgård2009-07-09
| | | | | | | Complex numbers must be declared using a base type of float, double, or long double. Originally committed as revision 19390 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Use full internal pathname in doxygen @file directives.Diego Biurrun2009-02-01
| | | | | | | Otherwise doxygen complains about ambiguous filenames when files exist under the same name in different subdirectories. Originally committed as revision 16912 to svn://svn.ffmpeg.org/ffmpeg/trunk
* Add generic IIR filter interface with Butterworth lowpass filter implementationKostya Shishkov2008-08-28
and remove obsoleted old lowpass filter. Originally committed as revision 15005 to svn://svn.ffmpeg.org/ffmpeg/trunk
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