| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "libavutil/intreadwrite.h" | ||
| 29 | #include "startcode.h" | ||
| 30 | #include "config.h" | ||
| 31 | |||
| 32 | 1233407 | int ff_startcode_find_candidate_c(const uint8_t *buf, int size) | |
| 33 | { | ||
| 34 | 1233407 | int i = 0; | |
| 35 | #if HAVE_FAST_UNALIGNED | ||
| 36 | /* we check i < size instead of i + 3 / 7 because it is | ||
| 37 | * simpler and there must be AV_INPUT_BUFFER_PADDING_SIZE | ||
| 38 | * bytes at the end. | ||
| 39 | */ | ||
| 40 | #if HAVE_FAST_64BIT | ||
| 41 |
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22364457 | while (i < size && |
| 42 | 22339932 | !((~AV_RN64(buf + i) & | |
| 43 |
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22339932 | (AV_RN64(buf + i) - 0x0101010101010101ULL)) & |
| 44 | 0x8080808080808080ULL)) | ||
| 45 | 21131050 | i += 8; | |
| 46 | #else | ||
| 47 | while (i < size && | ||
| 48 | !((~AV_RN32(buf + i) & | ||
| 49 | (AV_RN32(buf + i) - 0x01010101U)) & | ||
| 50 | 0x80808080U)) | ||
| 51 | i += 4; | ||
| 52 | #endif | ||
| 53 | #endif | ||
| 54 |
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5154429 | for (; i < size; i++) |
| 55 |
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4993390 | if (!buf[i]) |
| 56 | 1072368 | break; | |
| 57 | 1233407 | return i; | |
| 58 | } | ||
| 59 |