mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-22 07:20:45 +00:00
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/*
|
|
* (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_x86(DCTContext *s);
|
|
|
|
#endif /* AVCODEC_DCT_H */
|