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libavcodec/acelp_filters.h

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00001 /*
00002  * various filters for ACELP-based codecs
00003  *
00004  * Copyright (c) 2008 Vladimir Voroshilov
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #ifndef AVCODEC_ACELP_FILTERS_H
00024 #define AVCODEC_ACELP_FILTERS_H
00025 
00026 #include <stdint.h>
00027 
00037 extern const int16_t ff_acelp_interp_filter[61];
00038 
00054 void ff_acelp_interpolate(int16_t* out, const int16_t* in,
00055                           const int16_t* filter_coeffs, int precision,
00056                           int frac_pos, int filter_length, int length);
00057 
00061 void ff_acelp_interpolatef(float *out, const float *in,
00062                            const float *filter_coeffs, int precision,
00063                            int frac_pos, int filter_length, int length);
00064 
00065 
00089 void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2],
00090                                const int16_t* in, int length);
00091 
00103 void ff_acelp_apply_order_2_transfer_function(float *out, const float *in,
00104                                               const float zero_coeffs[2],
00105                                               const float pole_coeffs[2],
00106                                               float gain,
00107                                               float mem[2], int n);
00108 
00117 void ff_tilt_compensation(float *mem, float tilt, float *samples, int size);
00118 
00119 
00120 #endif /* AVCODEC_ACELP_FILTERS_H */

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