Libav 0.7.1
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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 Libav. 00007 * 00008 * Libav 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 * Libav 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 Libav; 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 */