repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
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 | ||
| 30 | /** Markers used in VC-1 AP frame data */ | |
| 31 | //@{ | |
| 32 | enum VC1Code { | |
| 33 | VC1_CODE_RES0 = 0x00000100, | |
| 34 | VC1_CODE_ENDOFSEQ = 0x0000010A, | |
| 35 | VC1_CODE_SLICE, | |
| 36 | VC1_CODE_FIELD, | |
| 37 | VC1_CODE_FRAME, | |
| 38 | VC1_CODE_ENTRYPOINT, | |
| 39 | VC1_CODE_SEQHDR, | |
| 40 | }; | |
| 41 | //@} | |
| 42 | ||
| 43 | #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0) | |
| 44 | ||
| 45 | /** Available Profiles */ | |
| 46 | //@{ | |
| 47 | enum Profile { | |
| 48 | PROFILE_SIMPLE, | |
| 49 | PROFILE_MAIN, | |
| 50 | PROFILE_COMPLEX, ///< TODO: WMV9 specific | |
| 51 | PROFILE_ADVANCED | |
| 52 | }; | |
| 53 | //@} | |
| 54 | ||
| 55 | /** Find VC-1 marker in buffer | |
| 56 | * @return position where next marker starts or end of buffer if no marker found | |
| 57 | */ | |
| 58 | static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) | |
| 59 | { | |
| 60 | uint32_t mrk = 0xFFFFFFFF; | |
| 61 | ||
| 62 | if (end-src < 4) | |
| 63 | return end; | |
| 64 | while (src < end) { | |
| 65 | mrk = (mrk << 8) | *src++; | |
| 66 | if (IS_MARKER(mrk)) | |
| 67 | return src - 4; | |
| 68 | } | |
| 69 | return end; | |
| 70 | } | |
| 71 | ||
| 72 | static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) | |
| 73 | { | |
| 74 | int dsize = 0, i; | |
| 75 | ||
| 76 | if (size < 4) { | |
| 77 | for (dsize = 0; dsize < size; dsize++) | |
| 78 | *dst++ = *src++; | |
| 79 | return size; | |
| 80 | } | |
| 81 | for (i = 0; i < size; i++, src++) { | |
| 82 | if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { | |
| 83 | dst[dsize++] = src[1]; | |
| 84 | src++; | |
| 85 | i++; | |
| 86 | } else | |
| 87 | dst[dsize++] = *src; | |
| 88 | } | |
| 89 | return dsize; | |
| 90 | } | |
| 91 | ||
| 92 | #endif /* AVCODEC_VC1_COMMON_H */ |