FFmpeg
libavcodec
dct.h
Go to the documentation of this file.
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/*
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* (I)DCT Transforms
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* Copyright (c) 2009 Peter Ross <pross@xvid.org>
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* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
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* Copyright (c) 2010 Vitor Sessak
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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 St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined(AVCODEC_DCT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT)
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#define AVCODEC_DCT_H
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#include <stddef.h>
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#include <stdint.h>
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#include "
rdft.h
"
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struct
DCTContext
{
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int
nbits
;
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int
inverse
;
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RDFTContext
rdft
;
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const
float
*
costab
;
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FFTSample
*
csc2
;
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void (*
dct_calc
)(
struct
DCTContext
*
s
,
FFTSample
*
data
);
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void (*
dct32
)(
FFTSample
*
out
,
const
FFTSample
*in);
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};
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/**
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* Set up DCT.
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* @param nbits size of the input array:
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* (1 << nbits) for DCT-II, DCT-III and DST-I
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* (1 << nbits) + 1 for DCT-I
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*
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* @note the first element of the input of DST-I is ignored
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*/
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int
ff_dct_init
(
DCTContext
*
s
,
int
nbits
,
enum
DCTTransformType
type
);
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void
ff_dct_end
(
DCTContext
*
s
);
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void
ff_dct_init_x86
(
DCTContext
*
s
);
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void
ff_fdct_ifast
(int16_t *
data
);
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void
ff_fdct_ifast248
(int16_t *
data
);
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void
ff_jpeg_fdct_islow_8
(int16_t *
data
);
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void
ff_jpeg_fdct_islow_10
(int16_t *
data
);
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void
ff_fdct248_islow_8
(int16_t *
data
);
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void
ff_fdct248_islow_10
(int16_t *
data
);
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void
ff_j_rev_dct
(int16_t *
data
);
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void
ff_j_rev_dct4
(int16_t *
data
);
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void
ff_j_rev_dct2
(int16_t *
data
);
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void
ff_j_rev_dct1
(int16_t *
data
);
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void
ff_jref_idct_put
(uint8_t *dest, ptrdiff_t line_size, int16_t *
block
);
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void
ff_jref_idct_add
(uint8_t *dest, ptrdiff_t line_size, int16_t *
block
);
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#endif
/* AVCODEC_DCT_H */
DCTContext::dct_calc
void(* dct_calc)(struct DCTContext *s, FFTSample *data)
Definition:
dct.h:38
out
FILE * out
Definition:
movenc.c:54
rdft.h
DCTContext::costab
const float * costab
Definition:
dct.h:36
ff_fdct248_islow_8
void ff_fdct248_islow_8(int16_t *data)
data
const char data[16]
Definition:
mxf.c:143
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition:
writing_filters.txt:86
s
#define s(width, name)
Definition:
cbs_vp9.c:257
ff_fdct_ifast248
void ff_fdct_ifast248(int16_t *data)
Definition:
jfdctfst.c:274
DCTContext::inverse
int inverse
Definition:
dct.h:34
ff_fdct_ifast
void ff_fdct_ifast(int16_t *data)
Definition:
jfdctfst.c:208
ff_jref_idct_put
void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition:
jrevdct.c:1160
FFTSample
float FFTSample
Definition:
avfft.h:35
ff_jpeg_fdct_islow_8
void ff_jpeg_fdct_islow_8(int16_t *data)
ff_fdct248_islow_10
void ff_fdct248_islow_10(int16_t *data)
ff_jpeg_fdct_islow_10
void ff_jpeg_fdct_islow_10(int16_t *data)
ff_dct_init_x86
void ff_dct_init_x86(DCTContext *s)
Definition:
dct_init.c:29
ff_dct_init
int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type)
Set up DCT.
Definition:
dct.c:177
ff_j_rev_dct1
void ff_j_rev_dct1(int16_t *data)
DCTContext::nbits
int nbits
Definition:
dct.h:33
ff_j_rev_dct2
void ff_j_rev_dct2(int16_t *data)
DCTContext::rdft
RDFTContext rdft
Definition:
dct.h:35
RDFTContext
Definition:
rdft.h:28
DCTContext::dct32
void(* dct32)(FFTSample *out, const FFTSample *in)
Definition:
dct.h:39
DCTContext
Definition:
dct.h:32
ff_j_rev_dct
void ff_j_rev_dct(int16_t *data)
ff_jref_idct_add
void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition:
jrevdct.c:1166
DCTContext::csc2
FFTSample * csc2
Definition:
dct.h:37
ff_dct_end
void ff_dct_end(DCTContext *s)
Definition:
dct.c:221
ff_j_rev_dct4
void ff_j_rev_dct4(int16_t *data)
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition:
filter_design.txt:207
DCTTransformType
DCTTransformType
Definition:
avfft.h:93
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