2 * The simplest AC-3 encoder
3 * Copyright (c) 2000 Fabrice Bellard
4 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
5 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 * fixed-point AC-3 encoder header.
29 #ifndef AVCODEC_AC3ENC_FIXED_H
30 #define AVCODEC_AC3ENC_FIXED_H
35 typedef int16_t SampleType;
36 typedef int32_t CoefType;
37 typedef int64_t CoefSumType;
42 * Used in fixed-point MDCT calculation.
44 typedef struct IComplex {
48 typedef struct AC3MDCTContext {
49 const int16_t *window; ///< MDCT window function
50 int nbits; ///< log2(transform size)
51 int16_t *costab; ///< FFT cos table
52 int16_t *sintab; ///< FFT sin table
53 int16_t *xcos1; ///< MDCT cos table
54 int16_t *xsin1; ///< MDCT sin table
55 int16_t *rot_tmp; ///< temp buffer for pre-rotated samples
56 IComplex *cplx_tmp; ///< temp buffer for complex pre-rotated samples
59 #endif /* AVCODEC_AC3ENC_FIXED_H */