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https://gitee.com/openharmony/third_party_ffmpeg
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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/**
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* LPC utility code
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* Copyright (c) 2006 Justin Ruggles <jruggle@earthlink.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef FFMPEG_LPC_H
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#define FFMPEG_LPC_H
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#include <inttypes.h>
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#define ORDER_METHOD_EST 0
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#define ORDER_METHOD_2LEVEL 1
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#define ORDER_METHOD_4LEVEL 2
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#define ORDER_METHOD_8LEVEL 3
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#define ORDER_METHOD_SEARCH 4
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#define ORDER_METHOD_LOG 5
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#define MIN_LPC_ORDER 1
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#define MAX_LPC_ORDER 32
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/**
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* Calculate LPC coefficients for multiple orders
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*/
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int ff_lpc_calc_coefs(DSPContext *s,
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const int32_t *samples, int blocksize, int min_order,
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int max_order, int precision,
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int32_t coefs[][MAX_LPC_ORDER], int *shift, int use_lpc,
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int omethod, int max_shift, int zero_shift);
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#endif /* FFMPEG_LPC_H */
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