FFmpeg/libavcodec/mpegvideoencdsp.c

/*
 * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <assert.h>
#include <stdint.h>

#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "dsputil.h"
#include "imgconvert.h"
#include "mpegvideoencdsp.h"

static int try_8x8basis_c(int16_t rem[64], int16_t weight[64],
                          int16_t basis[64], int scale)
{
    int i;
    unsigned int sum = 0;

    for (i = 0; i < 8 * 8; i++) {
        int b = rem[i] + ((basis[i] * scale +
                           (1 << (BASIS_SHIFT - RECON_SHIFT - 1))) >>
                          (BASIS_SHIFT - RECON_SHIFT));
        int w = weight[i];
        b >>= RECON_SHIFT;
        assert(-512 < b && b < 512);

        sum += (w * b) * (w * b) >> 4;
    }
    return sum >> 2;
}

static void add_8x8basis_c(int16_t rem[64], int16_t basis[64], int scale)
{
    int i;

    for (i = 0; i < 8 * 8; i++)
        rem[i] += (basis[i] * scale +
                   (1 << (BASIS_SHIFT - RECON_SHIFT - 1))) >>
                  (BASIS_SHIFT - RECON_SHIFT);
}

static int pix_sum_c(uint8_t *pix, int line_size)
{
    int s = 0, i, j;

    for (i = 0; i < 16; i++) {
        for (j = 0; j < 16; j += 8) {
            s   += pix[0];
            s   += pix[1];
            s   += pix[2];
            s   += pix[3];
            s   += pix[4];
            s   += pix[5];
            s   += pix[6];
            s   += pix[7];
            pix += 8;
        }
        pix += line_size - 16;
    }
    return s;
}

static int pix_norm1_c(uint8_t *pix, int line_size)
{
    int s = 0, i, j;
    uint32_t *sq = ff_square_tab + 256;

    for (i = 0; i < 16; i++) {
        for (j = 0; j < 16; j += 8) {
#if 0
            s += sq[pix[0]];
            s += sq[pix[1]];
            s += sq[pix[2]];
            s += sq[pix[3]];
            s += sq[pix[4]];
            s += sq[pix[5]];
            s += sq[pix[6]];
            s += sq[pix[7]];
#else
#if HAVE_FAST_64BIT
            register uint64_t x = *(uint64_t *) pix;
            s += sq[x         & 0xff];
            s += sq[(x >>  8) & 0xff];
            s += sq[(x >> 16) & 0xff];
            s += sq[(x >> 24) & 0xff];
            s += sq[(x >> 32) & 0xff];
            s += sq[(x >> 40) & 0xff];
            s += sq[(x >> 48) & 0xff];
            s += sq[(x >> 56) & 0xff];
#else
            register uint32_t x = *(uint32_t *) pix;
            s += sq[x         & 0xff];
            s += sq[(x >>  8) & 0xff];
            s += sq[(x >> 16) & 0xff];
            s += sq[(x >> 24) & 0xff];
            x  = *(uint32_t *) (pix + 4);
            s += sq[x         & 0xff];
            s += sq[(x >>  8) & 0xff];
            s += sq[(x >> 16) & 0xff];
            s += sq[(x >> 24) & 0xff];
#endif
#endif
            pix += 8;
        }
        pix += line_size - 16;
    }
    return s;
}

av_cold void ff_mpegvideoencdsp_init(MpegvideoEncDSPContext *c,
                                     AVCodecContext *avctx)
{
    c->try_8x8basis = try_8x8basis_c;
    c->add_8x8basis = add_8x8basis_c;

    c->shrink[0] = av_image_copy_plane;
    c->shrink[1] = ff_shrink22;
    c->shrink[2] = ff_shrink44;
    c->shrink[3] = ff_shrink88;

    c->pix_sum   = pix_sum_c;
    c->pix_norm1 = pix_norm1_c;

    if (ARCH_ARM)
        ff_mpegvideoencdsp_init_arm(c, avctx);
    if (ARCH_PPC)
        ff_mpegvideoencdsp_init_ppc(c, avctx);
    if (ARCH_X86)
        ff_mpegvideoencdsp_init_x86(c, avctx);
}