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 "internal.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 |
|
1007 |
static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end) |
60 |
|
|
{ |
61 |
✓✓ |
1007 |
if (end - src >= 4) { |
62 |
|
937 |
uint32_t mrk = 0xFFFFFFFF; |
63 |
|
937 |
src = avpriv_find_start_code(src, end, &mrk); |
64 |
✓✓ |
937 |
if (IS_MARKER(mrk)) |
65 |
|
694 |
return src - 4; |
66 |
|
|
} |
67 |
|
313 |
return end; |
68 |
|
|
} |
69 |
|
|
|
70 |
|
984 |
static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst) |
71 |
|
|
{ |
72 |
|
984 |
int dsize = 0, i; |
73 |
|
|
|
74 |
✓✓ |
984 |
if (size < 4) { |
75 |
✓✓ |
154 |
for (dsize = 0; dsize < size; dsize++) |
76 |
|
82 |
*dst++ = *src++; |
77 |
|
72 |
return size; |
78 |
|
|
} |
79 |
✓✓ |
4537842 |
for (i = 0; i < size; i++, src++) { |
80 |
✓✓✓✓ ✓✓✓✓ ✓✗✓✗
|
4536930 |
if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) { |
81 |
|
76 |
dst[dsize++] = src[1]; |
82 |
|
76 |
src++; |
83 |
|
76 |
i++; |
84 |
|
|
} else |
85 |
|
4536854 |
dst[dsize++] = *src; |
86 |
|
|
} |
87 |
|
912 |
return dsize; |
88 |
|
|
} |
89 |
|
|
|
90 |
|
|
#endif /* AVCODEC_VC1_COMMON_H */ |