GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/huffyuvencdsp.c Lines: 15 25 60.0 %
Date: 2019-11-22 03:34:36 Branches: 4 6 66.7 %

Line Branch Exec Source
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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "huffyuvencdsp.h"
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#include "mathops.h"
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// 0x00010001 or 0x0001000100010001 or whatever, depending on the cpu's native arithmetic size
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#define pw_1 (ULONG_MAX / UINT16_MAX)
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488200
static void diff_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w){
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    long i;
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#if !HAVE_FAST_UNALIGNED
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    if((long)src2 & (sizeof(long)-1)){
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        for(i=0; i+3<w; i+=4){
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            dst[i+0] = (src1[i+0]-src2[i+0]) & mask;
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            dst[i+1] = (src1[i+1]-src2[i+1]) & mask;
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            dst[i+2] = (src1[i+2]-src2[i+2]) & mask;
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            dst[i+3] = (src1[i+3]-src2[i+3]) & mask;
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        }
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    }else
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#endif
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    {
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488200
        unsigned long pw_lsb = (mask >> 1) * pw_1;
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488200
        unsigned long pw_msb = pw_lsb +  pw_1;
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        for (i = 0; i <= w - (int)sizeof(long)/2; i += sizeof(long)/2) {
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            long a = *(long*)(src1+i);
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            long b = *(long*)(src2+i);
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            *(long*)(dst+i) = ((a|pw_msb) - (b&pw_lsb)) ^ ((a^b^pw_msb)&pw_msb);
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        }
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    }
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515100
    for (; i<w; i++)
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26900
        dst[i] = (src1[i] - src2[i]) & mask;
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}
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static void sub_hfyu_median_pred_int16_c(uint16_t *dst, const uint16_t *src1, const uint16_t *src2, unsigned mask, int w, int *left, int *left_top){
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    int i;
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    uint16_t l, lt;
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    l  = *left;
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    lt = *left_top;
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    for(i=0; i<w; i++){
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        const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & mask);
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        lt = src1[i];
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        l  = src2[i];
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        dst[i] = (l - pred) & mask;
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    }
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    *left     = l;
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    *left_top = lt;
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}
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av_cold void ff_huffyuvencdsp_init(HuffYUVEncDSPContext *c, AVCodecContext *avctx)
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{
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    c->diff_int16           = diff_int16_c;
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    c->sub_hfyu_median_pred_int16 = sub_hfyu_median_pred_int16_c;
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    if (ARCH_X86)
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        ff_huffyuvencdsp_init_x86(c, avctx);
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}