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52 lines
1.7 KiB
52 lines
1.7 KiB
24 years ago
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/*
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* ac3_internal.h
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*
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* Copyright (C) Aaron Holtzman - May 1999
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*
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* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
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*
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* ac3dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ac3dec 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Make; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#define LEVEL_PLUS3DB 1.4142135623730951
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#define LEVEL_3DB 0.7071067811865476
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#define LEVEL_45DB 0.5946035575013605
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#define LEVEL_6DB 0.5
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/* Exponent strategy constants */
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#define EXP_REUSE (0)
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#define EXP_D15 (1)
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#define EXP_D25 (2)
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#define EXP_D45 (3)
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/* Delta bit allocation constants */
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#define DELTA_BIT_REUSE (0)
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#define DELTA_BIT_NEW (1)
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#define DELTA_BIT_NONE (2)
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#define DELTA_BIT_RESERVED (3)
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void bit_allocate (ac3_state_t * state, ac3_ba_t * ba, int bndstart,
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int start, int end, int fastleak, int slowleak,
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uint8_t * exp, int8_t * bap);
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int downmix_init (int input, int flags, float * level, float clev, float slev);
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void downmix (float * samples, int acmod, int output, float level, float bias,
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float clev, float slev);
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void imdct_init (void);
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extern void (* imdct_256) (float data[], float delay[]);
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extern void (* imdct_512) (float data[], float delay[]);
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