mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-27 05:38:31 +08:00
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#if defined(ENABLE_RTPPROXY)
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#include <string.h>
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#include "RtpSplitter.h"
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namespace mediakit{
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static const char kEHOME_MAGIC[] = "\x01\x00\x01\x00";
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static const int kEHOME_OFFSET = 256;
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RtpSplitter::RtpSplitter() {}
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RtpSplitter::~RtpSplitter() {}
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ssize_t RtpSplitter::onRecvHeader(const char *data,size_t len){
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//忽略偏移量
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data += _offset;
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len -= _offset;
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if (_is_ehome && len > 12 && data[12] == '\r') {
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//这是ehome,移除第12个字节
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memmove((char *) data + 1, data, 12);
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data += 1;
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len -= 1;
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}
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onRtpPacket(data, len);
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return 0;
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}
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static bool isEhome(const char *data, size_t len){
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if (len < 4) {
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return false;
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}
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return memcmp(data, kEHOME_MAGIC, sizeof(kEHOME_MAGIC) - 1) == 0;
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}
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const char *RtpSplitter::onSearchPacketTail(const char *data, size_t len) {
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if (len < 4) {
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//数据不够
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return nullptr;
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}
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if (isEhome(data, len)) {
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//是ehome协议
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if (len < kEHOME_OFFSET + 4) {
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//数据不够
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return nullptr;
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}
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//忽略ehome私有头后是rtsp样式的rtp，多4个字节，
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_offset = kEHOME_OFFSET + 4;
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_is_ehome = true;
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//忽略ehome私有头
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return onSearchPacketTail_l(data + kEHOME_OFFSET + 2, len - kEHOME_OFFSET - 2);
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}
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if (data[0] == '$') {
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//可能是4个字节的rtp头
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_offset = 4;
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return onSearchPacketTail_l(data + 2, len - 2);
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}
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//两个字节的rtp头
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_offset = 2;
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return onSearchPacketTail_l(data, len);
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}
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const char *RtpSplitter::onSearchPacketTail_l(const char *data, size_t len) {
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//这是rtp包
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uint16_t length = (((uint8_t *) data)[0] << 8) | ((uint8_t *) data)[1];
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if (len < (size_t)(length + 2)) {
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//数据不够
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return nullptr;
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}
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//返回rtp包末尾
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return data + 2 + length;
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}
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}//namespace mediakit
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#endif//defined(ENABLE_RTPPROXY)
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