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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* MMS protocol common definitions.
* Copyright (c) 2006,2007 Ryan Martell
* Copyright (c) 2007 Björn Axelsson
* Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
*
* 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
*/
#include "mms.h"
#include "asf.h"
#include "libavutil/intreadwrite.h"
#define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */
int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size)
{
char *pos;
int size_to_copy;
int remaining_size = mms->asf_header_size - mms->asf_header_read_size;
size_to_copy = FFMIN(size, remaining_size);
pos = mms->asf_header + mms->asf_header_read_size;
memcpy(buf, pos, size_to_copy);
if (mms->asf_header_read_size == mms->asf_header_size) {
av_freep(&mms->asf_header); // which contains asf header
}
mms->asf_header_read_size += size_to_copy;
return size_to_copy;
}
int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size)
{
int read_size;
read_size = FFMIN(size, mms->remaining_in_len);
memcpy(buf, mms->read_in_ptr, read_size);
mms->remaining_in_len -= read_size;
mms->read_in_ptr += read_size;
return read_size;
}
int ff_mms_asf_header_parser(MMSContext *mms)
{
uint8_t *p = mms->asf_header;
uint8_t *end;
int flags, stream_id;
mms->stream_num = 0;
if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (invalid ASF header, size=%d)\n",
mms->asf_header_size);
return AVERROR_INVALIDDATA;
}
end = mms->asf_header + mms->asf_header_size;
p += sizeof(ff_asf_guid) + 14;
while(end - p >= sizeof(ff_asf_guid) + 8) {
uint64_t chunksize;
if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) {
chunksize = 50; // see Reference [2] section 5.1
} else {
chunksize = AV_RL64(p + sizeof(ff_asf_guid));
}
if (!chunksize || chunksize > end - p) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (header chunksize %"PRId64" is invalid)\n",
chunksize);
return AVERROR_INVALIDDATA;
}
if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
/* read packet size */
if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (too large pkt_len %d)\n",
mms->asf_packet_len);
return AVERROR_INVALIDDATA;
}
}
} else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
stream_id = flags & 0x7F;
//The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
//we can calcuate the packet size by stream_num.
//Please see function send_stream_selection_request().
if (mms->stream_num < MMS_MAX_STREAMS &&
46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
mms->streams = av_fast_realloc(mms->streams,
&mms->nb_streams_allocated,
(mms->stream_num + 1) * sizeof(MMSStream));
mms->streams[mms->stream_num].id = stream_id;
mms->stream_num++;
} else {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (too many A/V streams)\n");
return AVERROR_INVALIDDATA;
}
} else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) {
if (end - p >= 88) {
int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86);
uint64_t skip_bytes = 88;
while (stream_count--) {
if (end - p < skip_bytes + 4) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (next stream name length is not in the buffer)\n");
return AVERROR_INVALIDDATA;
}
skip_bytes += 4 + AV_RL16(p + skip_bytes + 2);
}
while (ext_len_count--) {
if (end - p < skip_bytes + 22) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (next extension system info length is not in the buffer)\n");
return AVERROR_INVALIDDATA;
}
skip_bytes += 22 + AV_RL32(p + skip_bytes + 18);
}
if (end - p < skip_bytes) {
av_log(NULL, AV_LOG_ERROR,
"Corrupt stream (the last extension system info length is invalid)\n");
return AVERROR_INVALIDDATA;
}
if (chunksize - skip_bytes > 24)
chunksize = skip_bytes;
}
} else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
chunksize = 46; // see references [2] section 3.4. This should be set 46.
}
p += chunksize;
}
return 0;
}
|
