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Diffstat (limited to 'libavcodec/hpeldsp.h')
| -rw-r--r-- | libavcodec/hpeldsp.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/libavcodec/hpeldsp.h b/libavcodec/hpeldsp.h new file mode 100644 index 0000000000..8e4ae8ceb4 --- /dev/null +++ b/libavcodec/hpeldsp.h @@ -0,0 +1,105 @@ +/* + * Half-pel DSP functions. + * Copyright (c) 2000, 2001, 2002 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> + * + * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Half-pel DSP functions. + */ + +#ifndef AVCODEC_HPELDSP_H +#define AVCODEC_HPELDSP_H + +#include <stdint.h> +#include <stddef.h> + +/* add and put pixel (decoding) */ +// blocksizes for op_pixels_func are 8x4,8x8 16x8 16x16 +// h for op_pixels_func is limited to {width/2, width} but never larger +// than 16 and never smaller than 4 +typedef void (*hpel_pixels_func)(uint8_t *block /*align width (8 or 16)*/, + const uint8_t *pixels /*align 1*/, + ptrdiff_t line_size, int h); + +/** + * Half-pel DSP context. + */ +typedef struct HpelDSPContext { + /** + * Halfpel motion compensation with rounding (a+b+1)>>1. + * this is an array[4][4] of motion compensation functions for 4 + * horizontal blocksizes (8,16) and the 4 halfpel positions<br> + * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ] + * @param block destination where the result is stored + * @param pixels source + * @param line_size number of bytes in a horizontal line of block + * @param h height + */ + hpel_pixels_func put_pixels_tab[4][4]; + + /** + * Halfpel motion compensation with rounding (a+b+1)>>1. + * This is an array[4][4] of motion compensation functions for 4 + * horizontal blocksizes (8,16) and the 4 halfpel positions<br> + * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ] + * @param block destination into which the result is averaged (a+b+1)>>1 + * @param pixels source + * @param line_size number of bytes in a horizontal line of block + * @param h height + */ + hpel_pixels_func avg_pixels_tab[4][4]; + + /** + * Halfpel motion compensation with no rounding (a+b)>>1. + * this is an array[2][4] of motion compensation functions for 2 + * horizontal blocksizes (8,16) and the 4 halfpel positions<br> + * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ] + * @param block destination where the result is stored + * @param pixels source + * @param line_size number of bytes in a horizontal line of block + * @param h height + */ + hpel_pixels_func put_no_rnd_pixels_tab[2][4]; + + /** + * Halfpel motion compensation with no rounding (a+b)>>1. + * this is an array[4] of motion compensation functions for 1 + * horizontal blocksize (16) and the 4 halfpel positions<br> + * *pixels_tab[0][ xhalfpel + 2*yhalfpel ] + * @param block destination into which the result is averaged (a+b)>>1 + * @param pixels source + * @param line_size number of bytes in a horizontal line of block + * @param h height + */ + hpel_pixels_func avg_no_rnd_pixels_tab[4]; +} HpelDSPContext; + +void ff_hpeldsp_init(HpelDSPContext* p, int flags); + +void ff_hpeldsp_init_alpha(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_arm(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_bfin(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_x86(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_ppc(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_sh4(HpelDSPContext* c, int flags); +void ff_hpeldsp_init_vis(HpelDSPContext* c, int flags); + +#endif /* AVCODEC_HPELDSP_H */ |