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59 lines
1.9 KiB
59 lines
1.9 KiB
/* |
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* The simplest AC-3 encoder |
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* Copyright (c) 2000 Fabrice Bellard |
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* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> |
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* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; 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 |
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* fixed-point AC-3 encoder header. |
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*/ |
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#ifndef AVCODEC_AC3ENC_FIXED_H |
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#define AVCODEC_AC3ENC_FIXED_H |
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#include <stdint.h> |
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typedef int16_t SampleType; |
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typedef int32_t CoefType; |
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typedef int64_t CoefSumType; |
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/** |
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* Compex number. |
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* Used in fixed-point MDCT calculation. |
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*/ |
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typedef struct IComplex { |
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int16_t re,im; |
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} IComplex; |
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typedef struct AC3MDCTContext { |
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const int16_t *window; ///< MDCT window function |
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int nbits; ///< log2(transform size) |
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int16_t *costab; ///< FFT cos table |
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int16_t *sintab; ///< FFT sin table |
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int16_t *xcos1; ///< MDCT cos table |
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int16_t *xsin1; ///< MDCT sin table |
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int16_t *rot_tmp; ///< temp buffer for pre-rotated samples |
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IComplex *cplx_tmp; ///< temp buffer for complex pre-rotated samples |
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} AC3MDCTContext; |
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#endif /* AVCODEC_AC3ENC_FIXED_H */
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