diff options
author | Justin Ruggles <justin.ruggles@gmail.com> | 2011-01-03 19:08:56 +0300 |
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committer | Justin Ruggles <justin.ruggles@gmail.com> | 2011-01-03 19:08:56 +0300 |
commit | ad6b2c1f6d38dcf6754c6a98b60cb635d10be20c (patch) | |
tree | f4db0dd6d9d985313089e798a0cfb2a9f39910be /libavcodec/ac3enc_fixed.h | |
parent | f03424a782f39856c66577b106a8c0c9ab5c1da9 (diff) |
Move fixed-point parts of the AC-3 encoder to separate files.
Originally committed as revision 26206 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ac3enc_fixed.h')
-rw-r--r-- | libavcodec/ac3enc_fixed.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/libavcodec/ac3enc_fixed.h b/libavcodec/ac3enc_fixed.h new file mode 100644 index 0000000000..2d512017cb --- /dev/null +++ b/libavcodec/ac3enc_fixed.h @@ -0,0 +1,60 @@ +/* + * The simplest AC-3 encoder + * Copyright (c) 2000 Fabrice Bellard + * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com> + * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de> + * + * This file is part of FFmpeg. + * + * 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. + * + * 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * fixed-point AC-3 encoder header. + */ + +#ifndef AVCODEC_AC3ENC_FIXED_H +#define AVCODEC_AC3ENC_FIXED_H + +#include <stdint.h> + + +typedef int16_t SampleType; +typedef int32_t CoefType; + +#define SCALE_COEF(a) (a) + + +/** + * Compex number. + * Used in fixed-point MDCT calculation. + */ +typedef struct IComplex { + int16_t re,im; +} IComplex; + +typedef struct AC3MDCTContext { + const int16_t *window; ///< MDCT window function + int nbits; ///< log2(transform size) + int16_t *costab; ///< FFT cos table + int16_t *sintab; ///< FFT sin table + int16_t *xcos1; ///< MDCT cos table + int16_t *xsin1; ///< MDCT sin table + int16_t *rot_tmp; ///< temp buffer for pre-rotated samples + IComplex *cplx_tmp; ///< temp buffer for complex pre-rotated samples +} AC3MDCTContext; + +#endif /* AVCODEC_AC3ENC_FIXED_H */ |