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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * MMS protocol common definitions. |
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| 3 | * Copyright (c) 2006,2007 Ryan Martell |
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| 4 | * Copyright (c) 2007 Björn Axelsson |
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| 5 | * Copyright (c) 2010 Zhentan Feng |
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| 6 | * |
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| 7 | * This file is part of FFmpeg. |
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| 8 | * |
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| 9 | * FFmpeg is free software; you can redistribute it and/or |
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| 10 | * modify it under the terms of the GNU Lesser General Public |
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| 11 | * License as published by the Free Software Foundation; either |
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| 12 | * version 2.1 of the License, or (at your option) any later version. |
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| 13 | * |
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| 14 | * FFmpeg is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * Lesser General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU Lesser General Public |
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| 20 | * License along with FFmpeg; if not, write to the Free Software |
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| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | #include "mms.h" |
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| 24 | #include "asf.h" |
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| 25 | #include "libavutil/intreadwrite.h" |
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| 26 | |||
| 27 | #define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */ |
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| 28 | |||
| 29 | int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size) |
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| 30 | { |
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| 31 | char *pos; |
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| 32 | int size_to_copy; |
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| 33 | int remaining_size = mms->asf_header_size - mms->asf_header_read_size; |
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| 34 | size_to_copy = FFMIN(size, remaining_size); |
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| 35 | pos = mms->asf_header + mms->asf_header_read_size; |
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| 36 | memcpy(buf, pos, size_to_copy); |
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| 37 | if (mms->asf_header_read_size == mms->asf_header_size) { |
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| 38 | av_freep(&mms->asf_header); // which contains asf header |
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| 39 | } |
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| 40 | mms->asf_header_read_size += size_to_copy; |
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| 41 | return size_to_copy; |
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| 42 | } |
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| 43 | |||
| 44 | int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size) |
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| 45 | { |
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| 46 | int read_size; |
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| 47 | read_size = FFMIN(size, mms->remaining_in_len); |
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| 48 | memcpy(buf, mms->read_in_ptr, read_size); |
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| 49 | mms->remaining_in_len -= read_size; |
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| 50 | mms->read_in_ptr += read_size; |
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| 51 | return read_size; |
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| 52 | } |
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| 53 | |||
| 54 | int ff_mms_asf_header_parser(MMSContext *mms) |
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| 55 | { |
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| 56 | uint8_t *p = mms->asf_header; |
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| 57 | uint8_t *end; |
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| 58 | int flags, stream_id; |
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| 59 | mms->stream_num = 0; |
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| 60 | |||
| 61 | if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 || |
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| 62 | memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) { |
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| 63 | av_log(NULL, AV_LOG_ERROR, |
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| 64 | "Corrupt stream (invalid ASF header, size=%d)\n", |
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| 65 | mms->asf_header_size); |
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| 66 | return AVERROR_INVALIDDATA; |
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| 67 | } |
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| 68 | |||
| 69 | end = mms->asf_header + mms->asf_header_size; |
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| 70 | |||
| 71 | p += sizeof(ff_asf_guid) + 14; |
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| 72 | while(end - p >= sizeof(ff_asf_guid) + 8) { |
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| 73 | uint64_t chunksize; |
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| 74 | if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) { |
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| 75 | chunksize = 50; // see Reference [2] section 5.1 |
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| 76 | } else { |
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| 77 | chunksize = AV_RL64(p + sizeof(ff_asf_guid)); |
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| 78 | } |
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| 79 | if (!chunksize || chunksize > end - p) { |
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| 80 | av_log(NULL, AV_LOG_ERROR, |
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| 81 | "Corrupt stream (header chunksize %"PRId64" is invalid)\n", |
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| 82 | chunksize); |
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| 83 | return AVERROR_INVALIDDATA; |
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| 84 | } |
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| 85 | if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { |
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| 86 | /* read packet size */ |
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| 87 | if (end - p > sizeof(ff_asf_guid) * 2 + 68) { |
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| 88 | mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64); |
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| 89 | if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) { |
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| 90 | av_log(NULL, AV_LOG_ERROR, |
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| 91 | "Corrupt stream (too large pkt_len %d)\n", |
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| 92 | mms->asf_packet_len); |
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| 93 | return AVERROR_INVALIDDATA; |
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| 94 | } |
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| 95 | } |
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| 96 | } else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) { |
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| 97 | flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24); |
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| 98 | stream_id = flags & 0x7F; |
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| 99 | //The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size, |
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| 100 | //we can calcuate the packet size by stream_num. |
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| 101 | //Please see function send_stream_selection_request(). |
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| 102 | if (mms->stream_num < MMS_MAX_STREAMS && |
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| 103 | 46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) { |
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| 104 | mms->streams = av_fast_realloc(mms->streams, |
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| 105 | &mms->nb_streams_allocated, |
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| 106 | (mms->stream_num + 1) * sizeof(MMSStream)); |
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| 107 | if (!mms->streams) |
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| 108 | return AVERROR(ENOMEM); |
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| 109 | mms->streams[mms->stream_num].id = stream_id; |
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| 110 | mms->stream_num++; |
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| 111 | } else { |
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| 112 | av_log(NULL, AV_LOG_ERROR, |
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| 113 | "Corrupt stream (too many A/V streams)\n"); |
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| 114 | return AVERROR_INVALIDDATA; |
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| 115 | } |
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| 116 | } else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) { |
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| 117 | if (end - p >= 88) { |
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| 118 | int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86); |
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| 119 | uint64_t skip_bytes = 88; |
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| 120 | while (stream_count--) { |
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| 121 | if (end - p < skip_bytes + 4) { |
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| 122 | av_log(NULL, AV_LOG_ERROR, |
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| 123 | "Corrupt stream (next stream name length is not in the buffer)\n"); |
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| 124 | return AVERROR_INVALIDDATA; |
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| 125 | } |
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| 126 | skip_bytes += 4 + AV_RL16(p + skip_bytes + 2); |
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| 127 | } |
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| 128 | while (ext_len_count--) { |
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| 129 | if (end - p < skip_bytes + 22) { |
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| 130 | av_log(NULL, AV_LOG_ERROR, |
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| 131 | "Corrupt stream (next extension system info length is not in the buffer)\n"); |
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| 132 | return AVERROR_INVALIDDATA; |
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| 133 | } |
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| 134 | skip_bytes += 22 + AV_RL32(p + skip_bytes + 18); |
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| 135 | } |
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| 136 | if (end - p < skip_bytes) { |
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| 137 | av_log(NULL, AV_LOG_ERROR, |
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| 138 | "Corrupt stream (the last extension system info length is invalid)\n"); |
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| 139 | return AVERROR_INVALIDDATA; |
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| 140 | } |
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| 141 | if (chunksize - skip_bytes > 24) |
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| 142 | chunksize = skip_bytes; |
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| 143 | } |
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| 144 | } else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) { |
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| 145 | chunksize = 46; // see references [2] section 3.4. This should be set 46. |
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| 146 | } |
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| 147 | p += chunksize; |
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| 148 | } |
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| 149 | |||
| 150 | return 0; |
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| 151 | } |