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controller.h

/*
 * Copyright (c) 1991-1993 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 Computer Systems
 *    Engineering Group at Lawrence Berkeley 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: controller.h,v 1.22 96/04/25 06:13:10 van Exp $ (LBL)
 */

#ifndef vat_controller_h
#define vat_controller_h

class Audio;
class Site;
class SiteBox;
class SampleStream;
class VUMeter;
class PCM_Encoder;

#include "observe.h"
#include "audio.h"
#include "timer.h"
#include "inet.h"
#include "Tcl.h"
#include "media-timer.h"

#define TALK_LEAD (4)         // number of audio frames sent before a
                        // silence-to-talk transition 
#define TALK_TAIL (32)        // number of audio frames sent after a
                        // talk-to-silence transition

class Controller : public TclObject, public Observer, public MediaTimer,
                  public AudioHandler, public Timer {
    public:
      Controller();
      virtual void update(Observable*);
      int active() const;
      void mix_from_net(int del, const u_int8_t* frame, int len);
      virtual int command(int argc, const char*const* argv);
      inline int maxdel() const { return (as_->MaxSamp()); }
      u_int32_t media_ts();
      u_int32_t ref_ts();
    protected:
      virtual void timeout();
      virtual void audio_handle();
      void Activate();
      void DoAudio();
      void DoTimer();
      void mixaudio(SampleStream& ss);
      int sending() const;
      int Output();
      void send_block(u_int32_t ts, u_int8_t* blk, int len);

      Audio* audio_;

      SampleStream* as_;      /* audio stream to/from local device */
      SampleStream* ns_;      /* audio stream to/from network */

      int lastnetout_;
      int lastaudout_;
      u_int timer_interval_;
      u_long tsec_, tusec_;

      int ostate_;

      VUMeter* pmeter_;
      VUMeter* rmeter_;

      int talk_thresh_;
      int echo_thresh_;
      u_int echo_suppress_time_;
      int idle_drop_time_;
      int meter_update_;
      int active_;            /* set to 1 whenever audio or net written */

      u_int32_t last_mts_;    /* media timestamp of last block sent */
      timeval last_uts_;      /* unix timestamp associated with last_mts */

      /* XXX eventually want to handle other types of encoders */
      PCM_Encoder* encoder_;

      /*
       * Output buffering state needed to coalesce several sample
       * blocks from the audio hardware into a single chunk to
       * be handed to the encoder.
       */
      int outmax_;            /* size of chunk handed to encoder */
      int outlen_;            /* current size of chunk being built */
      u_int32_t out_ts_;      /* timestamp of head of current chunk */
      u_int8_t* out_;         /* pointer to chunk is sample-stream */
      u_int8_t overflow_[1024]; /* bounce buffer in case chunk wraps */
};

inline int Controller::sending() const
{
      return (ostate_ < TALK_TAIL+TALK_LEAD || out_);
}

inline int Controller::active() const
{
      return (audio_->HaveAudio());
}

#endif

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