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1 | /* |
2 | * MMS protocol common definitions. | |
3 | * Copyright (c) 2006,2007 Ryan Martell | |
4 | * Copyright (c) 2007 Björn Axelsson | |
5 | * Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com> | |
6 | * | |
7 | * This file is part of FFmpeg. | |
8 | * | |
9 | * FFmpeg is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * FFmpeg is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with FFmpeg; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | */ | |
23 | #include "mms.h" | |
24 | #include "asf.h" | |
25 | #include "libavutil/intreadwrite.h" | |
26 | ||
27 | #define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */ | |
28 | ||
29 | int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size) | |
30 | { | |
31 | char *pos; | |
32 | int size_to_copy; | |
33 | int remaining_size = mms->asf_header_size - mms->asf_header_read_size; | |
34 | size_to_copy = FFMIN(size, remaining_size); | |
35 | pos = mms->asf_header + mms->asf_header_read_size; | |
36 | memcpy(buf, pos, size_to_copy); | |
37 | if (mms->asf_header_read_size == mms->asf_header_size) { | |
38 | av_freep(&mms->asf_header); // which contains asf header | |
39 | } | |
40 | mms->asf_header_read_size += size_to_copy; | |
41 | return size_to_copy; | |
42 | } | |
43 | ||
44 | int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size) | |
45 | { | |
46 | int read_size; | |
47 | read_size = FFMIN(size, mms->remaining_in_len); | |
48 | memcpy(buf, mms->read_in_ptr, read_size); | |
49 | mms->remaining_in_len -= read_size; | |
50 | mms->read_in_ptr += read_size; | |
51 | return read_size; | |
52 | } | |
53 | ||
54 | int ff_mms_asf_header_parser(MMSContext *mms) | |
55 | { | |
56 | uint8_t *p = mms->asf_header; | |
57 | uint8_t *end; | |
58 | int flags, stream_id; | |
59 | mms->stream_num = 0; | |
60 | ||
61 | if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 || | |
62 | memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) { | |
63 | av_log(NULL, AV_LOG_ERROR, | |
64 | "Corrupt stream (invalid ASF header, size=%d)\n", | |
65 | mms->asf_header_size); | |
66 | return AVERROR_INVALIDDATA; | |
67 | } | |
68 | ||
69 | end = mms->asf_header + mms->asf_header_size; | |
70 | ||
71 | p += sizeof(ff_asf_guid) + 14; | |
72 | while(end - p >= sizeof(ff_asf_guid) + 8) { | |
73 | uint64_t chunksize; | |
74 | if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) { | |
75 | chunksize = 50; // see Reference [2] section 5.1 | |
76 | } else { | |
77 | chunksize = AV_RL64(p + sizeof(ff_asf_guid)); | |
78 | } | |
79 | if (!chunksize || chunksize > end - p) { | |
80 | av_log(NULL, AV_LOG_ERROR, | |
81 | "Corrupt stream (header chunksize %"PRId64" is invalid)\n", | |
82 | chunksize); | |
83 | return AVERROR_INVALIDDATA; | |
84 | } | |
85 | if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { | |
86 | /* read packet size */ | |
87 | if (end - p > sizeof(ff_asf_guid) * 2 + 68) { | |
88 | mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64); | |
89 | if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) { | |
90 | av_log(NULL, AV_LOG_ERROR, | |
91 | "Corrupt stream (too large pkt_len %d)\n", | |
92 | mms->asf_packet_len); | |
93 | return AVERROR_INVALIDDATA; | |
94 | } | |
95 | } | |
96 | } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) { | |
97 | flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24); | |
98 | stream_id = flags & 0x7F; | |
99 | //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size, | |
100 | //we can calcuate the packet size by stream_num. | |
101 | //Please see function send_stream_selection_request(). | |
102 | if (mms->stream_num < MMS_MAX_STREAMS && | |
103 | 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) { | |
104 | mms->streams = av_fast_realloc(mms->streams, | |
105 | &mms->nb_streams_allocated, | |
106 | (mms->stream_num + 1) * sizeof(MMSStream)); | |
107 | mms->streams[mms->stream_num].id = stream_id; | |
108 | mms->stream_num++; | |
109 | } else { | |
110 | av_log(NULL, AV_LOG_ERROR, | |
111 | "Corrupt stream (too many A/V streams)\n"); | |
112 | return AVERROR_INVALIDDATA; | |
113 | } | |
114 | } else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) { | |
115 | if (end - p >= 88) { | |
116 | int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86); | |
117 | uint64_t skip_bytes = 88; | |
118 | while (stream_count--) { | |
119 | if (end - p < skip_bytes + 4) { | |
120 | av_log(NULL, AV_LOG_ERROR, | |
121 | "Corrupt stream (next stream name length is not in the buffer)\n"); | |
122 | return AVERROR_INVALIDDATA; | |
123 | } | |
124 | skip_bytes += 4 + AV_RL16(p + skip_bytes + 2); | |
125 | } | |
126 | while (ext_len_count--) { | |
127 | if (end - p < skip_bytes + 22) { | |
128 | av_log(NULL, AV_LOG_ERROR, | |
129 | "Corrupt stream (next extension system info length is not in the buffer)\n"); | |
130 | return AVERROR_INVALIDDATA; | |
131 | } | |
132 | skip_bytes += 22 + AV_RL32(p + skip_bytes + 18); | |
133 | } | |
134 | if (end - p < skip_bytes) { | |
135 | av_log(NULL, AV_LOG_ERROR, | |
136 | "Corrupt stream (the last extension system info length is invalid)\n"); | |
137 | return AVERROR_INVALIDDATA; | |
138 | } | |
139 | if (chunksize - skip_bytes > 24) | |
140 | chunksize = skip_bytes; | |
141 | } | |
142 | } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) { | |
143 | chunksize = 46; // see references [2] section 3.4. This should be set 46. | |
144 | } | |
145 | p += chunksize; | |
146 | } | |
147 | ||
148 | return 0; | |
149 | } |