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