pixel.c

图象压缩程序

/*****************************************************************************
 * pixel.c: h264 encoder
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: pixel.c,v 1.1 2004/03/09 12:27:13 titer Exp $
 *
 * Authors: Eric Petit <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include "../pixel.h"
#include "pixel.h"

static int pixel_sad_16x16_altivec( uint8_t *pix1, int i_stride_pix1,
                                    uint8_t *pix2, int i_stride_pix2 )
{
    int y;
    unsigned int sum __attribute__((aligned(16)));
    vector unsigned char pix1v, pix2v;
    vector unsigned int  zero = vec_splat_u32( 0 );
    vector unsigned int  sumv = zero;
    for( y = 0; y < 16; y++ )
    {
        /* Read unaligned data */
        pix1v = vec_perm( vec_ld( 0, pix1 ), vec_ld( 16, pix1 ),
                          vec_lvsl( 0, pix1 ) );
        pix2v = vec_perm( vec_ld( 0, pix2 ), vec_ld( 16, pix2 ),
                          vec_lvsl( 0, pix2 ) );

        sumv = vec_sum4s( vec_sub( vec_max( pix1v, pix2v ),
                                   vec_min( pix1v, pix2v ) ),
                          sumv );

        pix1 += i_stride_pix1;
        pix2 += i_stride_pix2;
    }
    sumv = (vector unsigned int) vec_sums( (vector signed int) sumv,
                                           (vector signed int) zero );
    vec_ste( vec_splat( sumv, 3 ), 0, &sum );
    return sum;
}

/****************************************************************************
 * x264_pixel_init:
 ****************************************************************************/
void x264_pixel_altivec_init( x264_pixel_function_t *pixf )
{
    pixf->sad[PIXEL_16x16] = pixel_sad_16x16_altivec;
}