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 int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size)
31 int remaining_size = mms->asf_header_size - mms->asf_header_read_size;
32 size_to_copy = FFMIN(size, remaining_size);
33 pos = mms->asf_header + mms->asf_header_read_size;
34 memcpy(buf, pos, size_to_copy);
35 if (mms->asf_header_read_size == mms->asf_header_size) {
36 av_freep(&mms->asf_header); // which contains asf header
38 mms->asf_header_read_size += size_to_copy;
42 int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size)
45 read_size = FFMIN(size, mms->remaining_in_len);
46 memcpy(buf, mms->read_in_ptr, read_size);
47 mms->remaining_in_len -= read_size;
48 mms->read_in_ptr += read_size;
52 int ff_mms_asf_header_parser(MMSContext *mms)
54 uint8_t *p = mms->asf_header;
59 if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
60 memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
61 av_log(NULL, AV_LOG_ERROR,
62 "Corrupt stream (invalid ASF header, size=%d)\n",
63 mms->asf_header_size);
64 return AVERROR_INVALIDDATA;
67 end = mms->asf_header + mms->asf_header_size;
69 p += sizeof(ff_asf_guid) + 14;
70 while(end - p >= sizeof(ff_asf_guid) + 8) {
72 if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) {
73 chunksize = 50; // see Reference [2] section 5.1
75 chunksize = AV_RL64(p + sizeof(ff_asf_guid));
77 if (!chunksize || chunksize > end - p) {
78 av_log(NULL, AV_LOG_ERROR,
79 "Corrupt stream (header chunksize %"PRId64" is invalid)\n",
81 return AVERROR_INVALIDDATA;
83 if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
84 /* read packet size */
85 if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
86 mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
87 if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
88 av_log(NULL, AV_LOG_ERROR,
89 "Corrupt stream (too large pkt_len %d)\n",
91 return AVERROR_INVALIDDATA;
94 } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
95 flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
96 stream_id = flags & 0x7F;
97 //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
98 //we can calcuate the packet size by stream_num.
99 //Please see function send_stream_selection_request().
100 if (mms->stream_num < MAX_STREAMS &&
101 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
102 mms->streams = av_fast_realloc(mms->streams,
103 &mms->nb_streams_allocated,
104 (mms->stream_num + 1) * sizeof(MMSStream));
105 mms->streams[mms->stream_num].id = stream_id;
108 av_log(NULL, AV_LOG_ERROR,
109 "Corrupt stream (too many A/V streams)\n");
110 return AVERROR_INVALIDDATA;
112 } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
113 chunksize = 46; // see references [2] section 3.4. This should be set 46.