| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * VC-1 and WMV3 decoder | ||
| 3 | * Copyright (c) 2006-2007 Konstantin Shishkov | ||
| 4 | * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #ifndef AVCODEC_VC1_COMMON_H | ||
| 24 | #define AVCODEC_VC1_COMMON_H | ||
| 25 | |||
| 26 | #include <stdint.h> | ||
| 27 | |||
| 28 | #include "libavutil/attributes.h" | ||
| 29 | #include "startcode.h" | ||
| 30 | |||
| 31 | /** Markers used in VC-1 AP frame data */ | ||
| 32 | //@{ | ||
| 33 | enum VC1Code { | ||
| 34 | VC1_CODE_RES0 = 0x00000100, | ||
| 35 | VC1_CODE_ENDOFSEQ = 0x0000010A, | ||
| 36 | VC1_CODE_SLICE, | ||
| 37 | VC1_CODE_FIELD, | ||
| 38 | VC1_CODE_FRAME, | ||
| 39 | VC1_CODE_ENTRYPOINT, | ||
| 40 | VC1_CODE_SEQHDR, | ||
| 41 | }; | ||
| 42 | //@} | ||
| 43 | |||
| 44 | #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0) | ||
| 45 | |||
| 46 | /** Available Profiles */ | ||
| 47 | //@{ | ||
| 48 | enum Profile { | ||
| 49 | PROFILE_SIMPLE, | ||
| 50 | PROFILE_MAIN, | ||
| 51 | PROFILE_COMPLEX, ///< TODO: WMV9 specific | ||
| 52 | PROFILE_ADVANCED | ||
| 53 | }; | ||
| 54 | //@} | ||
| 55 | |||
| 56 | /** Find VC-1 marker in buffer | ||
| 57 | * @return position where next marker starts or end of buffer if no marker found | ||
| 58 | */ | ||
| 59 | 1043 | static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) | |
| 60 | { | ||
| 61 |
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1043 | if (end - src >= 4) { |
| 62 | 973 | uint32_t mrk = 0xFFFFFFFF; | |
| 63 | 973 | src = avpriv_find_start_code(src, end, &mrk); | |
| 64 |
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973 | if (IS_MARKER(mrk)) |
| 65 | 722 | return src - 4; | |
| 66 | } | ||
| 67 | 321 | return end; | |
| 68 | } | ||
| 69 | |||
| 70 | 1812 | static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) | |
| 71 | { | ||
| 72 | 1812 | int dsize = 0, i; | |
| 73 | |||
| 74 |
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1812 | if (size < 4) { |
| 75 |
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292 | for (dsize = 0; dsize < size; dsize++) |
| 76 | 178 | *dst++ = *src++; | |
| 77 | 114 | return size; | |
| 78 | } | ||
| 79 |
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5367035 | for (i = 0; i < size; i++, src++) { |
| 80 |
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5365337 | if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { |
| 81 | 16955 | dst[dsize++] = src[1]; | |
| 82 | 16955 | src++; | |
| 83 | 16955 | i++; | |
| 84 | } else | ||
| 85 | 5348382 | dst[dsize++] = *src; | |
| 86 | } | ||
| 87 | 1698 | return dsize; | |
| 88 | } | ||
| 89 | |||
| 90 | #endif /* AVCODEC_VC1_COMMON_H */ | ||
| 91 |