1 |
|
|
/* |
2 |
|
|
* AVS2-P2/IEEE1857.4 video parser. |
3 |
|
|
* Copyright (c) 2018 Huiwen Ren <hwrenx@gmail.com> |
4 |
|
|
* |
5 |
|
|
* This file is part of FFmpeg. |
6 |
|
|
* |
7 |
|
|
* FFmpeg is free software; you can redistribute it and/or |
8 |
|
|
* modify it under the terms of the GNU Lesser General Public |
9 |
|
|
* License as published by the Free Software Foundation; either |
10 |
|
|
* version 2.1 of the License, or (at your option) any later version. |
11 |
|
|
* |
12 |
|
|
* FFmpeg is distributed in the hope that it will be useful, |
13 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 |
|
|
* Lesser General Public License for more details. |
16 |
|
|
* |
17 |
|
|
* You should have received a copy of the GNU Lesser General Public |
18 |
|
|
* License along with FFmpeg; if not, write to the Free Software |
19 |
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 |
|
|
*/ |
21 |
|
|
|
22 |
|
|
#include "parser.h" |
23 |
|
|
|
24 |
|
|
#define AVS2_SLICE_MAX_START_CODE 0x000001AF |
25 |
|
|
|
26 |
|
|
#define AVS2_ISPIC(x) ((x) == 0xB3 || (x) == 0xB6) |
27 |
|
|
#define AVS2_ISUNIT(x) ((x) == 0xB0 || (x) == 0xB1 || (x) == 0xB2 || AVS2_ISPIC(x)) |
28 |
|
|
|
29 |
|
|
static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) |
30 |
|
|
{ |
31 |
|
|
int pic_found = pc->frame_start_found; |
32 |
|
|
uint32_t state = pc->state; |
33 |
|
|
int cur = 0; |
34 |
|
|
|
35 |
|
|
if (!pic_found) { |
36 |
|
|
for (; cur < buf_size; ++cur) { |
37 |
|
|
state = (state << 8) | buf[cur]; |
38 |
|
|
if (AVS2_ISUNIT(buf[cur])){ |
39 |
|
|
cur++; |
40 |
|
|
pic_found = 1; |
41 |
|
|
break; |
42 |
|
|
} |
43 |
|
|
} |
44 |
|
|
} |
45 |
|
|
|
46 |
|
|
if (pic_found) { |
47 |
|
|
if (!buf_size) |
48 |
|
|
return END_NOT_FOUND; |
49 |
|
|
for (; cur < buf_size; cur++) { |
50 |
|
|
state = (state << 8) | buf[cur]; |
51 |
|
|
if ((state & 0xFFFFFF00) == 0x100 && state > AVS2_SLICE_MAX_START_CODE) { |
52 |
|
|
pc->frame_start_found = 0; |
53 |
|
|
pc->state = -1; |
54 |
|
|
return cur - 3; |
55 |
|
|
} |
56 |
|
|
} |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
pc->frame_start_found = pic_found; |
60 |
|
|
pc->state = state; |
61 |
|
|
|
62 |
|
|
return END_NOT_FOUND; |
63 |
|
|
} |
64 |
|
|
|
65 |
|
|
static int avs2_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
66 |
|
|
const uint8_t **poutbuf, int *poutbuf_size, |
67 |
|
|
const uint8_t *buf, int buf_size) |
68 |
|
|
{ |
69 |
|
|
ParseContext *pc = s->priv_data; |
70 |
|
|
int next; |
71 |
|
|
|
72 |
|
|
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
73 |
|
|
next = buf_size; |
74 |
|
|
} else { |
75 |
|
|
next = avs2_find_frame_end(pc, buf, buf_size); |
76 |
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
77 |
|
|
*poutbuf = NULL; |
78 |
|
|
*poutbuf_size = 0; |
79 |
|
|
return buf_size; |
80 |
|
|
} |
81 |
|
|
} |
82 |
|
|
|
83 |
|
|
*poutbuf = buf; |
84 |
|
|
*poutbuf_size = buf_size; |
85 |
|
|
|
86 |
|
|
return next; |
87 |
|
|
} |
88 |
|
|
|
89 |
|
|
AVCodecParser ff_avs2_parser = { |
90 |
|
|
.codec_ids = { AV_CODEC_ID_AVS2 }, |
91 |
|
|
.priv_data_size = sizeof(ParseContext), |
92 |
|
|
.parser_parse = avs2_parse, |
93 |
|
|
.parser_close = ff_parse_close, |
94 |
|
|
.split = ff_mpeg4video_split, |
95 |
|
|
}; |