150 lines
6.1 KiB
C
150 lines
6.1 KiB
C
/*
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* MMS protocol common definitions.
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* Copyright (c) 2006,2007 Ryan Martell
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* Copyright (c) 2007 Björn Axelsson
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* Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "mms.h"
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#include "asf.h"
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#include "libavutil/intreadwrite.h"
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#define MMS_MAX_STREAMS 256 /**< arbitrary sanity check value */
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int ff_mms_read_header(MMSContext *mms, uint8_t *buf, const int size)
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{
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char *pos;
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int size_to_copy;
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int remaining_size = mms->asf_header_size - mms->asf_header_read_size;
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size_to_copy = FFMIN(size, remaining_size);
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pos = mms->asf_header + mms->asf_header_read_size;
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memcpy(buf, pos, size_to_copy);
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if (mms->asf_header_read_size == mms->asf_header_size) {
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av_freep(&mms->asf_header); // which contains asf header
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}
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mms->asf_header_read_size += size_to_copy;
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return size_to_copy;
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}
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int ff_mms_read_data(MMSContext *mms, uint8_t *buf, const int size)
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{
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int read_size;
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read_size = FFMIN(size, mms->remaining_in_len);
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memcpy(buf, mms->read_in_ptr, read_size);
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mms->remaining_in_len -= read_size;
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mms->read_in_ptr += read_size;
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return read_size;
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}
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int ff_mms_asf_header_parser(MMSContext *mms)
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{
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uint8_t *p = mms->asf_header;
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uint8_t *end;
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int flags, stream_id;
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mms->stream_num = 0;
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if (mms->asf_header_size < sizeof(ff_asf_guid) * 2 + 22 ||
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memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (invalid ASF header, size=%d)\n",
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mms->asf_header_size);
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return AVERROR_INVALIDDATA;
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}
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end = mms->asf_header + mms->asf_header_size;
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p += sizeof(ff_asf_guid) + 14;
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while(end - p >= sizeof(ff_asf_guid) + 8) {
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uint64_t chunksize;
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if (!memcmp(p, ff_asf_data_header, sizeof(ff_asf_guid))) {
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chunksize = 50; // see Reference [2] section 5.1
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} else {
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chunksize = AV_RL64(p + sizeof(ff_asf_guid));
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}
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if (!chunksize || chunksize > end - p) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (header chunksize %"PRId64" is invalid)\n",
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chunksize);
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return AVERROR_INVALIDDATA;
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}
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if (!memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
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/* read packet size */
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if (end - p > sizeof(ff_asf_guid) * 2 + 68) {
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mms->asf_packet_len = AV_RL32(p + sizeof(ff_asf_guid) * 2 + 64);
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if (mms->asf_packet_len <= 0 || mms->asf_packet_len > sizeof(mms->in_buffer)) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (too large pkt_len %d)\n",
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mms->asf_packet_len);
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return AVERROR_INVALIDDATA;
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}
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}
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} else if (!memcmp(p, ff_asf_stream_header, sizeof(ff_asf_guid))) {
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flags = AV_RL16(p + sizeof(ff_asf_guid)*3 + 24);
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stream_id = flags & 0x7F;
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//The second condition is for checking CS_PKT_STREAM_ID_REQUEST packet size,
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//we can calcuate the packet size by stream_num.
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//Please see function send_stream_selection_request().
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if (mms->stream_num < MMS_MAX_STREAMS &&
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46 + mms->stream_num * 6 < sizeof(mms->out_buffer)) {
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mms->streams = av_fast_realloc(mms->streams,
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&mms->nb_streams_allocated,
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(mms->stream_num + 1) * sizeof(MMSStream));
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mms->streams[mms->stream_num].id = stream_id;
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mms->stream_num++;
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} else {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (too many A/V streams)\n");
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return AVERROR_INVALIDDATA;
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}
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} else if (!memcmp(p, ff_asf_ext_stream_header, sizeof(ff_asf_guid))) {
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if (end - p >= 88) {
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int stream_count = AV_RL16(p + 84), ext_len_count = AV_RL16(p + 86);
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uint64_t skip_bytes = 88;
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while (stream_count--) {
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if (end - p < skip_bytes + 4) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (next stream name length is not in the buffer)\n");
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return AVERROR_INVALIDDATA;
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}
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skip_bytes += 4 + AV_RL16(p + skip_bytes + 2);
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}
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while (ext_len_count--) {
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if (end - p < skip_bytes + 22) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (next extension system info length is not in the buffer)\n");
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return AVERROR_INVALIDDATA;
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}
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skip_bytes += 22 + AV_RL32(p + skip_bytes + 18);
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}
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if (end - p < skip_bytes) {
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av_log(NULL, AV_LOG_ERROR,
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"Corrupt stream (the last extension system info length is invalid)\n");
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return AVERROR_INVALIDDATA;
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}
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if (chunksize - skip_bytes > 24)
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chunksize = skip_bytes;
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}
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} else if (!memcmp(p, ff_asf_head1_guid, sizeof(ff_asf_guid))) {
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chunksize = 46; // see references [2] section 3.4. This should be set 46.
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}
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p += chunksize;
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}
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return 0;
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}
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