mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-26 04:31:37 +08:00
91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/*
|
||
* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
|
||
*
|
||
* Use of this source code is governed by MIT-like license that can be found in the
|
||
* LICENSE file in the root of the source tree. All contributing project authors
|
||
* may be found in the AUTHORS file in the root of the source tree.
|
||
*/
|
||
|
||
#if defined(ENABLE_RTPPROXY)
|
||
#include <string.h>
|
||
#include "RtpSplitter.h"
|
||
namespace mediakit{
|
||
|
||
static const int kEHOME_OFFSET = 256;
|
||
|
||
ssize_t RtpSplitter::onRecvHeader(const char *data,size_t len){
|
||
//忽略偏移量
|
||
data += _offset;
|
||
len -= _offset;
|
||
|
||
if (_is_ehome && len > 12 && data[12] == '\r') {
|
||
//这是ehome,移除第12个字节
|
||
memmove((char *) data + 1, data, 12);
|
||
data += 1;
|
||
len -= 1;
|
||
}
|
||
onRtpPacket(data, len);
|
||
return 0;
|
||
}
|
||
|
||
static bool isEhome(const char *data, size_t len){
|
||
if (len < 4) {
|
||
return false;
|
||
}
|
||
if ((data[0] == 0x01) && (data[1] == 0x00) && (data[2] >= 0x01)) {
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
const char *RtpSplitter::onSearchPacketTail(const char *data, size_t len) {
|
||
if (len < 4) {
|
||
//数据不够
|
||
return nullptr;
|
||
}
|
||
|
||
if ( _is_ehome ) {
|
||
if (isEhome(data, len)) {
|
||
//是ehome协议
|
||
if (len < kEHOME_OFFSET + 4) {
|
||
//数据不够
|
||
return nullptr;
|
||
}
|
||
//忽略ehome私有头后是rtsp样式的rtp，多4个字节，
|
||
_offset = kEHOME_OFFSET + 4;
|
||
_is_ehome = true;
|
||
//忽略ehome私有头
|
||
return onSearchPacketTail_l(data + kEHOME_OFFSET + 2, len - kEHOME_OFFSET - 2);
|
||
}
|
||
_is_ehome = false;
|
||
}
|
||
|
||
if ( _is_rtsp_interleaved ) {
|
||
if (data[0] == '$') {
|
||
//可能是4个字节的rtp头
|
||
_offset = 4;
|
||
return onSearchPacketTail_l(data + 2, len - 2);
|
||
}
|
||
_is_rtsp_interleaved = false;
|
||
}
|
||
|
||
//两个字节的rtp头
|
||
_offset = 2;
|
||
return onSearchPacketTail_l(data, len);
|
||
}
|
||
|
||
const char *RtpSplitter::onSearchPacketTail_l(const char *data, size_t len) {
|
||
//这是rtp包
|
||
uint16_t length = (((uint8_t *) data)[0] << 8) | ((uint8_t *) data)[1];
|
||
if (len < (size_t)(length + 2)) {
|
||
//数据不够
|
||
return nullptr;
|
||
}
|
||
//返回rtp包末尾
|
||
return data + 2 + length;
|
||
}
|
||
|
||
}//namespace mediakit
|
||
#endif//defined(ENABLE_RTPPROXY)
|