diff options
Diffstat (limited to 'libavcodec/ac3.h')
| -rw-r--r-- | libavcodec/ac3.h | 62 |
1 files changed, 56 insertions, 6 deletions
diff --git a/libavcodec/ac3.h b/libavcodec/ac3.h index f2cb6c39df..5c9c37727e 100644 --- a/libavcodec/ac3.h +++ b/libavcodec/ac3.h @@ -2,20 +2,20 @@ * Common code between the AC-3 encoder and decoder * Copyright (c) 2000, 2001, 2002 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -39,6 +39,8 @@ #define AC3_CRITICAL_BANDS 50 #define AC3_MAX_CPL_BANDS 18 +#include "libavutil/opt.h" +#include "avcodec.h" #include "ac3tab.h" /* exponent encoding strategy */ @@ -49,11 +51,59 @@ #define EXP_D25 2 #define EXP_D45 3 +#ifndef USE_FIXED +#define USE_FIXED 0 +#endif + +#if USE_FIXED + +#define FFT_FLOAT 0 + +#define FIXR(a) ((int)((a) * 0 + 0.5)) +#define FIXR12(a) ((int)((a) * 4096 + 0.5)) +#define FIXR15(a) ((int)((a) * 32768 + 0.5)) +#define ROUND15(x) ((x) + 16384) >> 15 + +#define AC3_RENAME(x) x ## _fixed +#define AC3_NORM(norm) (1<<24)/(norm) +#define AC3_MUL(a,b) ((((int64_t) (a)) * (b))>>12) +#define AC3_RANGE(x) ((x)|(((x)&128)<<1)) +#define AC3_HEAVY_RANGE(x) ((x)<<1) +#define AC3_DYNAMIC_RANGE(x) (x) +#define AC3_SPX_BLEND(x) (x) +#define AC3_DYNAMIC_RANGE1 0 + +typedef int INTFLOAT; +typedef int16_t SHORTFLOAT; + +#else /* USE_FIXED */ + +#define FIXR(x) ((float)(x)) +#define FIXR12(x) ((float)(x)) +#define FIXR15(x) ((float)(x)) +#define ROUND15(x) (x) + +#define AC3_RENAME(x) x +#define AC3_NORM(norm) (1.0f/(norm)) +#define AC3_MUL(a,b) ((a) * (b)) +#define AC3_RANGE(x) (dynamic_range_tab[(x)]) +#define AC3_HEAVY_RANGE(x) (ff_ac3_heavy_dynamic_range_tab[(x)]) +#define AC3_DYNAMIC_RANGE(x) (powf(x, s->drc_scale)) +#define AC3_SPX_BLEND(x) (x)* (1.0f/32) +#define AC3_DYNAMIC_RANGE1 1.0f + +typedef float INTFLOAT; +typedef float SHORTFLOAT; + +#endif /* USE_FIXED */ + +#define AC3_LEVEL(x) ROUND15((x) * FIXR15(M_SQRT1_2)) + /* pre-defined gain values */ -#define LEVEL_PLUS_3DB 1.4142135623730950 +#define LEVEL_PLUS_3DB M_SQRT2 #define LEVEL_PLUS_1POINT5DB 1.1892071150027209 #define LEVEL_MINUS_1POINT5DB 0.8408964152537145 -#define LEVEL_MINUS_3DB 0.7071067811865476 +#define LEVEL_MINUS_3DB M_SQRT1_2 #define LEVEL_MINUS_4POINT5DB 0.5946035575013605 #define LEVEL_MINUS_6DB 0.5000000000000000 #define LEVEL_MINUS_9DB 0.3535533905932738 |