| /* | |
| * (I)DCT Transforms | |
| * Copyright (c) 2009 Peter Ross <[email protected]> | |
| * Copyright (c) 2010 Alex Converse <[email protected]> | |
| * Copyright (c) 2010 Vitor Sessak | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| struct DCTContext { | |
| int nbits; | |
| int inverse; | |
| RDFTContext rdft; | |
| const float *costab; | |
| FFTSample *csc2; | |
| void (*dct_calc)(struct DCTContext *s, FFTSample *data); | |
| void (*dct32)(FFTSample *out, const FFTSample *in); | |
| }; | |
| /** | |
| * Set up DCT. | |
| * @param nbits size of the input array: | |
| * (1 << nbits) for DCT-II, DCT-III and DST-I | |
| * (1 << nbits) + 1 for DCT-I | |
| * | |
| * @note the first element of the input of DST-I is ignored | |
| */ | |
| int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type); | |
| void ff_dct_end (DCTContext *s); | |
| void ff_dct_init_x86(DCTContext *s); | |
| void ff_j_rev_dct(int16_t *data); | |
| void ff_j_rev_dct4(int16_t *data); | |
| void ff_j_rev_dct2(int16_t *data); | |
| void ff_j_rev_dct1(int16_t *data); | |
| void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block); | |
| void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block); | |