LCOV - code coverage report
Current view: top level - libavcodec - startcode.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 10 10 100.0 %
Date: 2017-12-16 21:16:39 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * Accelerated start code search function for start codes common to
      24             :  * MPEG-1/2/4 video, VC-1, H.264/5
      25             :  * @author Michael Niedermayer <michaelni@gmx.at>
      26             :  */
      27             : 
      28             : #include "startcode.h"
      29             : #include "config.h"
      30             : 
      31     1177578 : int ff_startcode_find_candidate_c(const uint8_t *buf, int size)
      32             : {
      33     1177578 :     int i = 0;
      34             : #if HAVE_FAST_UNALIGNED
      35             :     /* we check i < size instead of i + 3 / 7 because it is
      36             :      * simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE
      37             :      * bytes at the end.
      38             :      */
      39             : #if HAVE_FAST_64BIT
      40    43720222 :     while (i < size &&
      41    42518938 :             !((~*(const uint64_t *)(buf + i) &
      42    42518938 :                     (*(const uint64_t *)(buf + i) - 0x0101010101010101ULL)) &
      43             :                     0x8080808080808080ULL))
      44    20105597 :         i += 8;
      45             : #else
      46             :     while (i < size &&
      47             :             !((~*(const uint32_t *)(buf + i) &
      48             :                     (*(const uint32_t *)(buf + i) - 0x01010101U)) &
      49             :                     0x80808080U))
      50             :         i += 4;
      51             : #endif
      52             : #endif
      53     4966297 :     for (; i < size; i++)
      54     4810914 :         if (!buf[i])
      55     1022195 :             break;
      56     1177578 :     return i;
      57             : }

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