104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// INTEL Corporation Proprietary Information
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// This listing is supplied under the terms of a license agreement with Intel
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// Corporation and many not be copied nor disclosed except in accordance
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// with the terms of that agreement.
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// Copyright (c) 1995, 1996 Intel Corporation.
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//
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//
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// Module Name: rtpclass.h
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// Environment: MSVC 4.0, OLE 2
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/////////////////////////////////////////////////////////////////////////////////
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#ifndef RTPCLASS_H
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#define RTPCLASS_H
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#include "rtp.h"
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class RTP_Header {
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public:
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enum { fixed_header_size = 12 };
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private:
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#ifdef DEBUG
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union {
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unsigned char bytes[fixed_header_size];
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RTP_HDR_T header; /* This is here for convenience in debugging only */
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};
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#else
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unsigned char bytes[fixed_header_size];
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#endif
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public:
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int v() { return (bytes[0] >> 6) & 3; }
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void set_v(int v) { bytes[0] = (bytes[0] & 0x3f) | ((v & 3) << 6); }
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int p() { return (bytes[0] >> 5) & 1; }
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void set_p(int v) { bytes[0] = (bytes[0] & 0xdf) | ((v & 1) << 5); }
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int x() { return (bytes[0] >> 4) & 1; }
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void set_x(int v) { bytes[0] = (bytes[0] & 0xef) | ((v & 1) << 4); }
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int cc() { return bytes[0] & 0x0f; }
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void set_cc(int v) { bytes[0] = (bytes[0] & 0xf0) | (v & 0x0f); }
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int m() { return (bytes[1] >> 7) & 1; }
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void set_m(int v) { bytes[1] = (bytes[1] & 0x7f) | ((v & 1) << 7); }
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int pt() { return (bytes[1] & 0x7f); }
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void set_pt(int v) { bytes[1] = (bytes[1] & 0x80) | (v & 0x7f); }
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unsigned short seq() { return bytes[2] << 8 | bytes[3]; };
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void set_seq(unsigned short v) { bytes[2] = (unsigned char)(v >> 8);
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bytes[3] = (unsigned char)(v);
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}
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unsigned long ts() { return (unsigned long)bytes[4] << 24
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| (unsigned long)bytes[5] << 16
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| (unsigned long)bytes[6] << 8
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| (unsigned long)bytes[7];
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}
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void set_ts(unsigned long v) { bytes[4] = (unsigned char)(v >> 24);
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bytes[5] = (unsigned char)(v >> 16);
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bytes[6] = (unsigned char)(v >> 8);
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bytes[7] = (unsigned char)(v);
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}
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unsigned long ssrc() { return (unsigned long)bytes[8] << 24
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| (unsigned long)bytes[9] << 16
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| (unsigned long)bytes[10] << 8
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| (unsigned long)bytes[11];
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}
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void set_ssrc(unsigned long v) { bytes[8] = (unsigned char)(v >> 24);
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bytes[9] = (unsigned char)(v >> 16);
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bytes[10] = (unsigned char)(v >> 8);
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bytes[11] = (unsigned char)(v);
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}
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//refer to section 5.3.1 of the RTP spec to understand the RTP Extension header.
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int header_size()
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{
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int NumCSRCBytes = cc() * 4;
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int NumExtensionBytes = 0;
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if ( x() == 1 )
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{
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//tmp points to the first word of the extended header.
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//bytes 2 and 3 of this word contain the length of the extended header
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//in 32-bit words (not counting the first word)
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unsigned char *tmp = bytes + fixed_header_size + NumCSRCBytes;
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unsigned short x_len = ((unsigned short)tmp[2] << 8) | (unsigned short)tmp[3];
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//number of words plus the length field itself.
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NumExtensionBytes = (x_len + 1) * 4;
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}
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//the fixed header plus the csrc list plus the extended header
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return ( fixed_header_size + NumCSRCBytes + NumExtensionBytes );
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}
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};
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#endif
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