lossless_videodsp.c 2.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
/*
 * Lossless video DSP utils
 *
 * 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
 */
#include "avcodec.h"
#include "lossless_videodsp.h"
22
#include "libavcodec/mathops.h"
23

24 25 26 27
// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
#define pb_7f (~0UL / 255 * 0x7f)
#define pb_80 (~0UL / 255 * 0x80)

28
static void add_bytes_c(uint8_t *dst, uint8_t *src, ptrdiff_t w)
29 30 31 32 33 34 35 36 37 38 39 40 41
{
    long i;

    for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
        long a = *(long *) (src + i);
        long b = *(long *) (dst + i);
        *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
    }
    for (; i < w; i++)
        dst[i + 0] += src[i + 0];
}

static void add_median_pred_c(uint8_t *dst, const uint8_t *src1,
42
                              const uint8_t *diff, ptrdiff_t w,
43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
                              int *left, int *left_top)
{
    int i;
    uint8_t l, lt;

    l  = *left;
    lt = *left_top;

    for (i = 0; i < w; i++) {
        l      = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
        lt     = src1[i];
        dst[i] = l;
    }

    *left     = l;
    *left_top = lt;
}

61
static int add_left_pred_c(uint8_t *dst, const uint8_t *src, ptrdiff_t w,
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
                           int acc)
{
    int i;

    for (i = 0; i < w - 1; i++) {
        acc   += src[i];
        dst[i] = acc;
        i++;
        acc   += src[i];
        dst[i] = acc;
    }

    for (; i < w; i++) {
        acc   += src[i];
        dst[i] = acc;
    }

    return acc;
}

82
static int add_left_pred_int16_c(uint16_t *dst, const uint16_t *src, unsigned mask, ptrdiff_t w, unsigned acc){
83 84 85 86
    int i;

    for(i=0; i<w-1; i++){
        acc+= src[i];
87
        dst[i]= acc &= mask;
88 89
        i++;
        acc+= src[i];
90
        dst[i]= acc &= mask;
91 92 93 94
    }

    for(; i<w; i++){
        acc+= src[i];
95
        dst[i]= acc &= mask;
96 97 98 99 100 101
    }

    return acc;
}


102
void ff_llviddsp_init(LLVidDSPContext *c)
103
{
104 105 106 107
    c->add_bytes                  = add_bytes_c;
    c->add_median_pred            = add_median_pred_c;
    c->add_left_pred              = add_left_pred_c;

108
    c->add_left_pred_int16        = add_left_pred_int16_c;
109

110 111
    if (ARCH_PPC)
        ff_llviddsp_init_ppc(c);
112
    if (ARCH_X86)
113
        ff_llviddsp_init_x86(c);
114
}