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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avformat.h"
#define NTSC_FRAME_SIZE 120000
#define PAL_FRAME_SIZE 144000
typedef struct DVDemuxContext {
int is_audio;
} DVDemuxContext;
/* raw input */
static int dv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *vst, *ast;
vst = av_new_stream(s, 0);
if (!vst)
return AVERROR_NOMEM;
vst->codec.codec_type = CODEC_TYPE_VIDEO;
vst->codec.codec_id = CODEC_ID_DVVIDEO;
#if 0
ast = av_new_stream(s, 1);
if (!ast)
return AVERROR_NOMEM;
ast->codec.codec_type = CODEC_TYPE_AUDIO;
ast->codec.codec_id = CODEC_ID_DVAUDIO;
#endif
return 0;
}
/* XXX: build fake audio stream when DV audio decoder will be finished */
int dv_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret, size, dsf;
uint8_t buf[4];
ret = get_buffer(&s->pb, buf, 4);
if (ret <= 0)
return -EIO;
dsf = buf[3] & 0x80;
if (!dsf)
size = NTSC_FRAME_SIZE;
else
size = PAL_FRAME_SIZE;
if (av_new_packet(pkt, size) < 0)
return -EIO;
pkt->stream_index = 0;
memcpy(pkt->data, buf, 4);
ret = get_buffer(&s->pb, pkt->data + 4, size - 4);
if (ret <= 0) {
av_free_packet(pkt);
return -EIO;
}
return ret;
}
int dv_read_close(AVFormatContext *s)
{
return 0;
}
AVInputFormat dv_iformat = {
"dv",
"DV video format",
sizeof(DVDemuxContext),
NULL,
dv_read_header,
dv_read_packet,
dv_read_close,
extensions: "dv",
};
#if 0
int dv_write_header(struct AVFormatContext *s)
{
return 0;
}
int dv_write_packet(struct AVFormatContext *s,
int stream_index,
unsigned char *buf, int size, int force_pts)
{
put_buffer(&s->pb, buf, size);
put_flush_packet(&s->pb);
return 0;
}
int dv_write_trailer(struct AVFormatContext *s)
{
return 0;
}
AVOutputFormat dv_oformat = {
"dv",
"DV video format",
NULL,
"dv",
0,
CODEC_ID_DVVIDEO,
CODEC_ID_DVAUDIO,
dv_write_header,
dv_write_packet,
dv_write_trailer,
};
#endif
int dv_init(void)
{
av_register_input_format(&dv_iformat);
// av_register_output_format(&dv_oformat);
return 0;
}
|
