LCOV - code coverage report
Current view: top level - libavcodec - lossless_videoencdsp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 25 25 100.0 %
Date: 2017-12-14 08:27:08 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #include "config.h"
      20             : #include "libavutil/attributes.h"
      21             : #include "lossless_videoencdsp.h"
      22             : #include "mathops.h"
      23             : 
      24             : // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
      25             : #define pb_7f (~0UL / 255 * 0x7f)
      26             : #define pb_80 (~0UL / 255 * 0x80)
      27             : 
      28      443900 : static void diff_bytes_c(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, intptr_t w)
      29             : {
      30             :     long i;
      31             : 
      32             : #if !HAVE_FAST_UNALIGNED
      33             :     if (((long)src1 | (long)src2) & (sizeof(long) - 1)) {
      34             :         for (i = 0; i + 7 < w; i += 8) {
      35             :             dst[i + 0] = src1[i + 0] - src2[i + 0];
      36             :             dst[i + 1] = src1[i + 1] - src2[i + 1];
      37             :             dst[i + 2] = src1[i + 2] - src2[i + 2];
      38             :             dst[i + 3] = src1[i + 3] - src2[i + 3];
      39             :             dst[i + 4] = src1[i + 4] - src2[i + 4];
      40             :             dst[i + 5] = src1[i + 5] - src2[i + 5];
      41             :             dst[i + 6] = src1[i + 6] - src2[i + 6];
      42             :             dst[i + 7] = src1[i + 7] - src2[i + 7];
      43             :         }
      44             :     } else
      45             : #endif
      46    24322250 :     for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
      47    23878350 :         long a = *(long *) (src1 + i);
      48    23878350 :         long b = *(long *) (src2 + i);
      49    47756700 :         *(long *) (dst + i) = ((a | pb_80) - (b & pb_7f)) ^
      50    23878350 :                               ((a ^ b ^ pb_80) & pb_80);
      51             :     }
      52      472500 :     for (; i < w; i++)
      53       28600 :         dst[i + 0] = src1[i + 0] - src2[i + 0];
      54      443900 : }
      55             : 
      56      215200 : static void sub_median_pred_c(uint8_t *dst, const uint8_t *src1,
      57             :                               const uint8_t *src2, intptr_t w,
      58             :                               int *left, int *left_top)
      59             : {
      60             :     int i;
      61             :     uint8_t l, lt;
      62             : 
      63      215200 :     l  = *left;
      64      215200 :     lt = *left_top;
      65             : 
      66    68397600 :     for (i = 0; i < w; i++) {
      67    68182400 :         const int pred = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF);
      68    68182400 :         lt     = src1[i];
      69    68182400 :         l      = src2[i];
      70    68182400 :         dst[i] = l - pred;
      71             :     }
      72             : 
      73      215200 :     *left     = l;
      74      215200 :     *left_top = lt;
      75      215200 : }
      76             : 
      77         176 : av_cold void ff_llvidencdsp_init(LLVidEncDSPContext *c)
      78             : {
      79         176 :     c->diff_bytes      = diff_bytes_c;
      80         176 :     c->sub_median_pred = sub_median_pred_c;
      81             : 
      82             :     if (ARCH_X86)
      83         176 :         ff_llvidencdsp_init_x86(c);
      84         176 : }

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