FFmpeg: libavcodec/dct.h Source File

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dct.h

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1 /*

2 * (I)DCT Transforms

6 *

7 * This file is part of FFmpeg.

8 *

9 * FFmpeg is free software; you can redistribute it and/or

10 * modify it under the terms of the GNU Lesser General Public

11 * License as published by the Free Software Foundation; either

12 * version 2.1 of the License, or (at your option) any later version.

13 *

14 * FFmpeg is distributed in the hope that it will be useful,

15 * but WITHOUT ANY WARRANTY; without even the implied warranty of

16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

17 * Lesser General Public License for more details.

18 *

19 * You should have received a copy of the GNU Lesser General Public

20 * License along with FFmpeg; if not, write to the Free Software

21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

22 */

24 #if !defined(AVCODEC_DCT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT)

25 #define AVCODEC_DCT_H

27 #include <stddef.h>

28 #include <stdint.h>

30 #include "rdft.h"

32 struct DCTContext {

33 int nbits;

34 int inverse;

35 RDFTContext rdft;

36 const float *costab;

37 FFTSample *csc2;

38 void (*dct_calc)(struct DCTContext *s, FFTSample *data);

39 void (*dct32)(FFTSample *out, const FFTSample *in);

40 };

42 /**

43 * Set up DCT.

44 * @param nbits size of the input array:

45 * (1 << nbits) for DCT-II, DCT-III and DST-I

46 * (1 << nbits) + 1 for DCT-I

47 *

48 * @note the first element of the input of DST-I is ignored

49 */

50 int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);

51 void ff_dct_end (DCTContext *s);

53 void ff_dct_init_x86(DCTContext *s);

55 void ff_fdct_ifast(int16_t *data);

56 void ff_fdct_ifast248(int16_t *data);

57 void ff_jpeg_fdct_islow_8(int16_t *data);

58 void ff_jpeg_fdct_islow_10(int16_t *data);

59 void ff_fdct248_islow_8(int16_t *data);

60 void ff_fdct248_islow_10(int16_t *data);

62 void ff_j_rev_dct(int16_t *data);

63 void ff_j_rev_dct4(int16_t *data);

64 void ff_j_rev_dct2(int16_t *data);

65 void ff_j_rev_dct1(int16_t *data);

66 void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block);

67 void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block);

69 #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

#define s(width, name)

Definition: cbs_vp9.c:256

ff_fdct_ifast248

void ff_fdct_ifast248(int16_t *data)

Definition: jfdctfst.c:273

DCTContext::inverse

int inverse

Definition: dct.h:34

ff_fdct_ifast

void ff_fdct_ifast(int16_t *data)

Definition: jfdctfst.c:207

ff_jref_idct_put

void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)

Definition: jrevdct.c:1162

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:28

ff_dct_init

int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type)

Set up DCT.

Definition: dct.c:179

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:1168

DCTContext::csc2

FFTSample * csc2

Definition: dct.h:37

ff_dct_end

void ff_dct_end(DCTContext *s)

Definition: dct.c:224

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

Definition: avfft.h:93

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