68 строки
2.0 KiB
C
68 строки
2.0 KiB
C
/**
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* Aften: A/52 audio encoder
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* Copyright (c) 2006 Justin Ruggles
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*
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* Based on "The simplest AC3 encoder" from FFmpeg
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* Copyright (c) 2000 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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/**
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* @file exponent.h
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* A/52 exponent header
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*/
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#ifndef EXPONENT_H
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#define EXPONENT_H
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#include "common.h"
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#if defined(HAVE_MMX) || defined(HAVE_SSE)
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#include "x86/exponent.h"
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#endif
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struct A52ThreadContext;
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#define A52_EXPSTR_SETS 32
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extern int nexpgrptab[3][256];
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extern uint16_t expstr_set_bits[A52_EXPSTR_SETS][256];
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typedef struct A52ExponentFunctions {
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/** Set exp[i] to min(exp[i], exp1[i]) */
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void (*exponent_min)(uint8_t *exp, uint8_t *exp1, int n);
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/**
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* Update the exponents so that they are the ones the decoder will decode.
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* Constrain DC exponent, group exponents based on strategy, constrain delta
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* between adjacent exponents to +2/-2.
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*/
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void (*encode_exp_blk_ch)(uint8_t *exp, int ncoefs, int exp_strategy);
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/**
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* Calculate sum of squared error between 2 sets of exponents.
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*/
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int (*exponent_sum_square_error)(uint8_t *exp0, uint8_t *exp1, int ncoefs);
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} A52ExponentFunctions;
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extern void exponent_init(A52ExponentFunctions *expf);
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extern void a52_process_exponents(struct A52ThreadContext *tctx);
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#endif /* EXPONENT_H */
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