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>
7 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/intreadwrite.h"
27 #if FF_API_MAX_STREAMS
28 #define MMS_MAX_STREAMS MAX_STREAMS
30 #define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */
33 int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size)
37 int remaining_size = mms->asf_header_size - mms->asf_header_read_size;
38 size_to_copy = FFMIN(size, remaining_size);
39 pos = mms->asf_header + mms->asf_header_read_size;
40 memcpy(buf, pos, size_to_copy);
41 if (mms->asf_header_read_size == mms->asf_header_size) {
42 av_freep(&mms->asf_header); // which contains asf header
44 mms->asf_header_read_size += size_to_copy;
48 int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size)
51 read_size = FFMIN(size, mms->remaining_in_len);
52 memcpy(buf, mms->read_in_ptr, read_size);
53 mms->remaining_in_len -= read_size;
54 mms->read_in_ptr += read_size;
58 int ff_mms_asf_header_parser(MMSContext *mms)
60 uint8_t *p = mms->asf_header;
65 if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
66 memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
67 av_log(NULL, AV_LOG_ERROR,
68 "Corrupt stream (invalid ASF header, size=%d)\n",
69 mms->asf_header_size);
70 return AVERROR_INVALIDDATA;
73 end = mms->asf_header + mms->asf_header_size;
75 p += sizeof(ff_asf_guid) + 14;
76 while(end - p >= sizeof(ff_asf_guid) + 8) {
78 if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) {
79 chunksize = 50; // see Reference [2] section 5.1
81 chunksize = AV_RL64(p + sizeof(ff_asf_guid));
83 if (!chunksize || chunksize > end - p) {
84 av_log(NULL, AV_LOG_ERROR,
85 "Corrupt stream (header chunksize %"PRId64" is invalid)\n",
87 return AVERROR_INVALIDDATA;
89 if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
90 /* read packet size */
91 if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
92 mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
93 if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
94 av_log(NULL, AV_LOG_ERROR,
95 "Corrupt stream (too large pkt_len %d)\n",
97 return AVERROR_INVALIDDATA;
100 } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
101 flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
102 stream_id = flags & 0x7F;
103 //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
104 //we can calcuate the packet size by stream_num.
105 //Please see function send_stream_selection_request().
106 if (mms->stream_num < MMS_MAX_STREAMS &&
107 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
108 mms->streams = av_fast_realloc(mms->streams,
109 &mms->nb_streams_allocated,
110 (mms->stream_num + 1) * sizeof(MMSStream));
111 mms->streams[mms->stream_num].id = stream_id;
114 av_log(NULL, AV_LOG_ERROR,
115 "Corrupt stream (too many A/V streams)\n");
116 return AVERROR_INVALIDDATA;
118 } else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) {
120 int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86);
121 uint64_t skip_bytes = 88;
122 while (stream_count--) {
123 if (end - p < skip_bytes + 4) {
124 av_log(NULL, AV_LOG_ERROR,
125 "Corrupt stream (next stream name length is not in the buffer)\n");
126 return AVERROR_INVALIDDATA;
128 skip_bytes += 4 + AV_RL16(p + skip_bytes + 2);
130 while (ext_len_count--) {
131 if (end - p < skip_bytes + 22) {
132 av_log(NULL, AV_LOG_ERROR,
133 "Corrupt stream (next extension system info length is not in the buffer)\n");
134 return AVERROR_INVALIDDATA;
136 skip_bytes += 22 + AV_RL32(p + skip_bytes + 18);
138 if (end - p < skip_bytes) {
139 av_log(NULL, AV_LOG_ERROR,
140 "Corrupt stream (the last extension system info length is invalid)\n");
141 return AVERROR_INVALIDDATA;
143 if (chunksize - skip_bytes > 24)
144 chunksize = skip_bytes;
146 } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
147 chunksize = 46; // see references [2] section 3.4. This should be set 46.