FFmpeg
mdct15.h
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1 /*
2  * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_MDCT15_H
22 #define AVCODEC_MDCT15_H
23 
24 #include <stddef.h>
25 
26 #include "libavutil/mem_internal.h"
27 
28 #include "fft.h"
29 
30 typedef struct MDCT15Context {
31  int fft_n;
32  int len2;
33  int len4;
34  int inverse;
37 
41 
43 
44  /* 15-point FFT */
45  void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
46 
47  /* PFA postrotate and exptab */
48  void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8);
49 
50  /* Calculate a full 2N -> N MDCT */
51  void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
52 
53  /* Calculate the middle half of the iMDCT */
54  void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,
55  ptrdiff_t stride);
57 
58 /* Init an (i)MDCT of the length 2 * 15 * (2^N) */
59 int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
61 
63 
64 #endif /* AVCODEC_MDCT15_H */
stride
int stride
Definition: mace.c:144
mem_internal.h
out
FILE * out
Definition: movenc.c:54
MDCT15Context::mdct
void(* mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride)
Definition: mdct15.h:51
MDCT15Context::fft15
void(* fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride)
Definition: mdct15.h:45
MDCT15Context::exptab
FFTComplex exptab[64]
Definition: mdct15.h:42
MDCT15Context::pfa_postreindex
int * pfa_postreindex
Definition: mdct15.h:36
ff_mdct15_uninit
void ff_mdct15_uninit(MDCT15Context **ps)
Definition: mdct15.c:43
MDCT15Context::fft_n
int fft_n
Definition: mdct15.h:31
MDCT15Context::twiddle_exptab
FFTComplex * twiddle_exptab
Definition: mdct15.h:40
s
#define s(width, name)
Definition: cbs_vp9.c:257
MDCT15Context::pfa_prereindex
int * pfa_prereindex
Definition: mdct15.h:35
MDCT15Context
Definition: mdct15.h:30
src
#define src
Definition: vp8dsp.c:255
exp
int8_t exp
Definition: eval.c:72
MDCT15Context::tmp
FFTComplex * tmp
Definition: mdct15.h:39
N
#define N
Definition: af_mcompand.c:53
MDCT15Context::len4
int len4
Definition: mdct15.h:33
ff_mdct15_init_x86
void ff_mdct15_init_x86(MDCT15Context *s)
Definition: mdct15_init.c:82
ff_mdct15_init
int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale)
Definition: mdct15.c:247
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
FFTContext
Definition: fft.h:83
MDCT15Context::ptwo_fft
FFTContext ptwo_fft
Definition: mdct15.h:38
MDCT15Context::imdct_half
void(* imdct_half)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride)
Definition: mdct15.h:54
fft.h
MDCT15Context::postreindex
void(* postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8)
Definition: mdct15.h:48
inverse
static int inverse(AudioFWTDNContext *s, double **in, int *in_length, double *out, int out_length, int ch, uint64_t sn)
Definition: af_afwtdn.c:791
MDCT15Context::len2
int len2
Definition: mdct15.h:32
MDCT15Context::inverse
int inverse
Definition: mdct15.h:34
FFTComplex
Definition: avfft.h:37