119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: RTCPSRPacket.cpp
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Contains: A class that writes a RTCP Sender Report
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Change History (most recent first):
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*/
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#include <string.h>
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#include "RTCPSRPacket.h"
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#include "MyAssert.h"
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#include "OS.h"
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RTCPSRPacket::RTCPSRPacket()
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{
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// Write as much of the Sender Report as is possible
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char theTempCName[kMaxCNameLen];
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UInt32 cNameLen = RTCPSRPacket::GetACName(theTempCName);
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//write the SR & SDES headers
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UInt32* theSRWriter = (UInt32*)&fSenderReportBuffer;
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*theSRWriter = htonl(0x80c80006);
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theSRWriter += 7; //number of UInt32s in an SR.
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//SDES length is the length of the CName, plus 2 32bit words, plus the 32bit word for the SSRC
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*theSRWriter = htonl(0x81ca0000 + (cNameLen >> 2) + 1);
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::memcpy(&fSenderReportBuffer[kSenderReportSizeInBytes], theTempCName, cNameLen);
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fSenderReportSize = kSenderReportSizeInBytes + cNameLen;
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/*
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SERVER INFO PACKET FORMAT
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struct qtss_rtcp_struct
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{
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RTCPHeader header;
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UInt32 ssrc; // ssrc of rtcp originator
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OSType name;
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UInt32 senderSSRC;
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SInt16 reserved;
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SInt16 length; // bytes of data (atoms) / 4
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// qtsi_rtcp_atom structures follow
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};
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*/
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//
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// Write the SERVER INFO APP packet
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UInt32* theAckInfoWriter = (UInt32*)&fSenderReportBuffer[fSenderReportSize];
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*theAckInfoWriter = htonl(0x81cc0006);
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theAckInfoWriter += 2;
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*(theAckInfoWriter++) = htonl(FOUR_CHARS_TO_INT('q', 't', 's', 'i')); // Ack Info APP name
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theAckInfoWriter++; // leave space for the ssrc (again)
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*(theAckInfoWriter++) = htonl(2); // 2 UInt32s for the 'at' field
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*(theAckInfoWriter++) = htonl(FOUR_CHARS_TO_INT( 'a', 't', 0, 4 ));
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fSenderReportWithServerInfoSize = (char*)(theAckInfoWriter+1) - fSenderReportBuffer;
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UInt32* theByeWriter = (UInt32*)&fSenderReportBuffer[fSenderReportWithServerInfoSize];
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*theByeWriter = htonl(0x81cb0001);
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}
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UInt32 RTCPSRPacket::GetACName(char* ioCNameBuffer)
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{
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static char* sCNameBase = "QTSS";
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//clear out the whole buffer
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::memset(ioCNameBuffer, 0, kMaxCNameLen);
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//cName identifier
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ioCNameBuffer[0] = 1;
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//Unique cname is constructed from the base name and the current time
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qtss_sprintf(&ioCNameBuffer[1], " %s%"_64BITARG_"d", sCNameBase, OS::Milliseconds() / 1000);
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UInt32 cNameLen = ::strlen(ioCNameBuffer);
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//2nd byte of CName should be length
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ioCNameBuffer[1] = (UInt8) (cNameLen - 2);//don't count indicator or length byte
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// This function assumes that the cName is the only item in this SDES chunk
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// (see RTP rfc for details).
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// The RFC says that the item (the cName) should not be NULL terminated, but
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// the chunk *must* be NULL terminated. And padded to a 32-bit boundary.
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//
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// qtss_sprintf already put a NULL terminator in the cName buffer. So all we have to
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// do is pad out to the boundary.
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cNameLen += 1; //add on the NULL character
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UInt32 paddedLength = cNameLen + (4 - (cNameLen % 4));
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// Pad, and zero out as we pad.
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for (; cNameLen < paddedLength; cNameLen++)
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ioCNameBuffer[cNameLen] = '\0';
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Assert((cNameLen % 4) == 0);
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return cNameLen;
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}
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