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Diffstat (limited to 'libavcodec/mdct15.h')
-rw-r--r-- | libavcodec/mdct15.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/libavcodec/mdct15.h b/libavcodec/mdct15.h new file mode 100644 index 0000000..42e60f3 --- /dev/null +++ b/libavcodec/mdct15.h @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> + * + * 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 + */ + +#ifndef AVCODEC_MDCT15_H +#define AVCODEC_MDCT15_H + +#include <stddef.h> + +#include "fft.h" + +typedef struct MDCT15Context { + int fft_n; + int len2; + int len4; + int inverse; + int *pfa_prereindex; + int *pfa_postreindex; + + FFTContext ptwo_fft; + FFTComplex *tmp; + FFTComplex *twiddle_exptab; + + DECLARE_ALIGNED(32, FFTComplex, exptab)[64]; + + /* 15-point FFT */ + void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); + + /* PFA postrotate and exptab */ + void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); + + /* Calculate a full 2N -> N MDCT */ + void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride); + + /* Calculate the middle half of the iMDCT */ + void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src, + ptrdiff_t stride); +} MDCT15Context; + +/* Init an (i)MDCT of the length 2 * 15 * (2^N) */ +int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale); +void ff_mdct15_uninit(MDCT15Context **ps); + +void ff_mdct15_init_x86(MDCT15Context *s); + +#endif /* AVCODEC_MDCT15_H */ |