blob: 0a03e256d1365962cdefeda8c4e0f98c15521a85
| 1 | /* |
| 2 | * (I)DCT Transforms |
| 3 | * Copyright (c) 2009 Peter Ross <pross@xvid.org> |
| 4 | * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> |
| 5 | * Copyright (c) 2010 Vitor Sessak |
| 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 | */ |
| 23 | |
| 24 | #if !defined(AVCODEC_DCT_H) && (!defined(FFT_FLOAT) || FFT_FLOAT) |
| 25 | #define AVCODEC_DCT_H |
| 26 | |
| 27 | #include <stddef.h> |
| 28 | #include <stdint.h> |
| 29 | |
| 30 | #include "rdft.h" |
| 31 | |
| 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 | }; |
| 41 | |
| 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); |
| 52 | |
| 53 | void ff_dct_init_x86(DCTContext *s); |
| 54 | |
| 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); |
| 61 | |
| 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); |
| 68 | |
| 69 | #endif /* AVCODEC_DCT_H */ |
| 70 |