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transmitter.h

/*
 * Copyright (c) 1993-1995 The Regents of the University of California.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the Network Research
 *    Group at Lawrence Berkeley National Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) $Header: transmitter.h,v 1.6 96/03/16 13:14:00 van Exp $ (LBL)
 */

#ifndef vic_transmitter_h
#define vic_transmitter_h

#ifdef WIN32
#include <winsock.h>
#else
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#endif
#include "Tcl.h"
#include "timer.h"
#include "rtp.h"
#include "inet.h"

/*
 * The base object for performing the outbound path of
 * the application level protocol.
 */
class Transmitter : public TclObject, public Timer {
    public:
      Transmitter();
      virtual void timeout();

      struct buffer {
            struct buffer* next;
            /*
             * make buffer twice as big as necessary so we can
             * run off end while doing in-place encoding.
             */
            u_char data[2 * RTP_MTU];
      };
      struct pktbuf {
            struct pktbuf* next;
            iovec iov[2];
            u_char hdr[MAXHDR];
            buffer* buf;
      };
      static void dump(int fd);
      static inline void seqno(u_int16_t s) { seqno_ = s; }
      inline void bps(int kbps) { kbps = kbps_; }
      inline int mtu() const { return (mtu_); }
      void flush();
      void send(pktbuf*);
      /*
       * Buffer allocation hooks.
       */
      pktbuf* alloch(u_int32_t, int fmt);
      void release(pktbuf*);
      pktbuf* alloc(u_int32_t, int fmt);
    protected:
      void update(int nbytes);
      void dump(int fd, iovec*, int iovel) const;
      void loopback(pktbuf*);
      void output(pktbuf* pb);
      virtual void transmit(pktbuf* pb) = 0;
      double gettimeofday() const;
      double txtime(pktbuf* pb);

      int mtu_;         /* mtu of wire (as seen by application) */
      msghdr mh_;

      int nf_;          /* number of frames sent */
      int nb_;          /* number of bytes sent */
      int np_;          /* number of packets sent */
      
      int kbps_;        /* bit-rate for interpkt spacing */
      double nextpkttime_;

      /* packet transmission queue */
      int busy_;
      pktbuf* head_;
      pktbuf* tail_;

      int loopback_;          /* true to loopback data packets */
      static int dumpfd_;     /* fd to dump packet stream to */
      static u_int16_t seqno_;
    private:
      static pktbuf* freehdrs_;
      static buffer* freebufs_;
      static int nbufs_;
      static int nhdrs_;
};

#endif

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