mirror of https://git.ffmpeg.org/ffmpeg.git
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
|
|
* ac3_internal.h
|
|
*
|
|
* Copyright (C) Aaron Holtzman - May 1999
|
|
*
|
|
* This file is part of ac3dec, a free Dolby AC-3 stream decoder.
|
|
*
|
|
* ac3dec is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* ac3dec is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GNU Make; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#define LEVEL_PLUS3DB 1.4142135623730951
|
|
#define LEVEL_3DB 0.7071067811865476
|
|
#define LEVEL_45DB 0.5946035575013605
|
|
#define LEVEL_6DB 0.5
|
|
|
|
/* Exponent strategy constants */
|
|
#define EXP_REUSE (0)
|
|
#define EXP_D15 (1)
|
|
#define EXP_D25 (2)
|
|
#define EXP_D45 (3)
|
|
|
|
/* Delta bit allocation constants */
|
|
#define DELTA_BIT_REUSE (0)
|
|
#define DELTA_BIT_NEW (1)
|
|
#define DELTA_BIT_NONE (2)
|
|
#define DELTA_BIT_RESERVED (3)
|
|
|
|
void bit_allocate (ac3_state_t * state, ac3_ba_t * ba, int bndstart,
|
|
int start, int end, int fastleak, int slowleak,
|
|
uint8_t * exp, int8_t * bap);
|
|
|
|
int downmix_init (int input, int flags, float * level, float clev, float slev);
|
|
void downmix (float * samples, int acmod, int output, float level, float bias,
|
|
float clev, float slev);
|
|
|
|
void imdct_init (void);
|
|
extern void (* imdct_256) (float data[], float delay[]);
|
|
extern void (* imdct_512) (float data[], float delay[]);
|