mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
1.6 KiB
52 lines
1.6 KiB
/* |
|
* (I)DCT Transforms |
|
* Copyright (c) 2009 Peter Ross <pross@xvid.org> |
|
* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com> |
|
* Copyright (c) 2010 Vitor Sessak |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_DCT_H |
|
#define AVCODEC_DCT_H |
|
|
|
#include "rdft.h" |
|
|
|
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_mmx(DCTContext *s); |
|
|
|
#endif /* AVCODEC_DCT_H */
|
|
|