1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* RV30/40 parser
* Copyright (c) 2011 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* RV30/40 parser
*/
#include "parser.h"
#include "libavutil/intreadwrite.h"
typedef struct {
ParseContext pc;
int64_t key_dts;
int key_pts;
} RV34ParseContext;
static const int rv_to_av_frame_type[4] = {
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
};
static int rv34_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
RV34ParseContext *pc = s->priv_data;
int type, pts, hdr;
if (buf_size < 13 + *buf * 8) {
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
hdr = AV_RB32(buf + 9 + *buf * 8);
if (avctx->codec_id == AV_CODEC_ID_RV30) {
type = (hdr >> 27) & 3;
pts = (hdr >> 7) & 0x1FFF;
} else {
type = (hdr >> 29) & 3;
pts = (hdr >> 6) & 0x1FFF;
}
if (type != 3 && s->pts != AV_NOPTS_VALUE) {
pc->key_dts = s->pts;
pc->key_pts = pts;
} else {
if (type != 3)
s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
else
s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
}
s->pict_type = rv_to_av_frame_type[type];
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
#ifdef CONFIG_RV30_PARSER
AVCodecParser ff_rv30_parser = {
.codec_ids = { AV_CODEC_ID_RV30 },
.priv_data_size = sizeof(RV34ParseContext),
.parser_parse = rv34_parse,
};
#endif
#ifdef CONFIG_RV40_PARSER
AVCodecParser ff_rv40_parser = {
.codec_ids = { AV_CODEC_ID_RV40 },
.priv_data_size = sizeof(RV34ParseContext),
.parser_parse = rv34_parse,
};
#endif
|
