From bb937155ec5c035865256a86e3659f9aa83fc5ba Mon Sep 17 00:00:00 2001 From: Colin McQuillan Date: Sat, 15 Aug 2009 11:22:55 +0000 Subject: Add a function that can apply an order 2 rational transfer function in-place. This function will be used in the upcoming AMR-NB floating point decoder for high-pass filtering. Patch by Colin McQuillan ( m.niloc googlemail com ) Originally committed as revision 19649 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/acelp_filters.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'libavcodec/acelp_filters.h') diff --git a/libavcodec/acelp_filters.h b/libavcodec/acelp_filters.h index b7f6a3abcb..2cbe9bb17d 100644 --- a/libavcodec/acelp_filters.h +++ b/libavcodec/acelp_filters.h @@ -81,4 +81,20 @@ void ff_acelp_interpolate(int16_t* out, const int16_t* in, void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2], const int16_t* in, int length); +/** + * Apply an order 2 rational transfer function in-place. + * + * @param samples [in/out] + * @param zero_coeffs z^-1 and z^-2 coefficients of the numerator + * @param pole_coeffs z^-1 and z^-2 coefficients of the denominator + * @param gain scale factor for final output + * @param mem intermediate values used by filter (should be 0 initially) + * @param n number of samples + */ +void ff_acelp_apply_order_2_transfer_function(float *samples, + const float zero_coeffs[2], + const float pole_coeffs[2], + float gain, + float mem[2], int n); + #endif /* AVCODEC_ACELP_FILTERS_H */ -- cgit v1.2.3