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libavcodec/lsp.h

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00001 /*
00002  * LSP computing 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_LSP_H
00024 #define AVCODEC_LSP_H
00025 
00026 #include <stdint.h>
00027 
00040 void ff_acelp_reorder_lsf(int16_t* lsfq, int lsfq_min_distance, int lsfq_min, int lsfq_max, int lp_order);
00041 
00053 void ff_set_min_dist_lsf(float *lsf, double min_spacing, int order);
00054 
00063 void ff_acelp_lsf2lsp(int16_t *lsp, const int16_t *lsf, int lp_order);
00064 
00071 void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
00072 
00081 void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd, const int16_t* lsp_prev, int lp_order);
00082 
00083 
00084 #define MAX_LP_HALF_ORDER 8
00085 
00098 void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order);
00099 
00105 void ff_sort_nearly_sorted_floats(float *vals, int len);
00106 
00117 void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order);
00118 
00119 #endif /* AVCODEC_LSP_H */

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