FFmpeg
vc1_common.h
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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,
41 };
42 //@}
43 
44 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
45 
46 /** Available Profiles */
47 //@{
48 enum Profile {
51  PROFILE_COMPLEX, ///< TODO: WMV9 specific
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  */
60 {
61  if (end - src >= 4) {
62  uint32_t mrk = 0xFFFFFFFF;
63  src = avpriv_find_start_code(src, end, &mrk);
64  if (IS_MARKER(mrk))
65  return src - 4;
66  }
67  return end;
68 }
69 
71 {
72  int dsize = 0, i;
73 
74  if (size < 4) {
75  for (dsize = 0; dsize < size; dsize++)
76  *dst++ = *src++;
77  return size;
78  }
79  for (i = 0; i < size; i++, src++) {
80  if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
81  dst[dsize++] = src[1];
82  src++;
83  i++;
84  } else
85  dst[dsize++] = *src;
86  }
87  return dsize;
88 }
89 
90 #endif /* AVCODEC_VC1_COMMON_H */
#define IS_MARKER(x)
Definition: vc1_common.h:44
#define src
Definition: vp8dsp.c:254
Macro definitions for various function/variable attributes.
uint8_t
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
ptrdiff_t size
Definition: opengl_enc.c:100
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
VC1Code
Markers used in VC-1 AP frame data.
Definition: vc1_common.h:33
static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
Definition: vc1_common.h:70
Profile
Available Profiles.
Definition: vc1_common.h:48
TODO: WMV9 specific.
Definition: vc1_common.h:51
common internal api header.
#define av_always_inline
Definition: attributes.h:39
static av_always_inline const uint8_t * find_next_marker(const uint8_t *src, const uint8_t *end)
Find VC-1 marker in buffer.
Definition: vc1_common.h:59