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audio-voxware.cc

/*
 * 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.
 */
static const char rcsid[] =
    "@(#) $Header: audio-voxware.cc,v 1.10 96/04/26 05:22:05 van Exp $ (LBL)";

#include <iostream.h>

#include <string.h>
#include <sys/fcntl.h>
#include <errno.h>
#if defined(sco) || defined(__bsdi__)
#include <sys/socket.h>
#endif
#if defined(__FreeBSD__)
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <machine/soundcard.h>
#else
#include <sys/soundcard.h>
#endif
#include "audio.h"
#include "Tcl.h"

#define ULAW_ZERO 0x7f
#define ABUFLOG2 8
#define ABUFLEN (1 << ABUFLOG2)
#define NFRAG 5

class VoxWareAudio : public Audio {
    public:
      VoxWareAudio();
      virtual int FrameReady();
      virtual u_char* Read();
      virtual     void Write(u_char *);
      virtual void SetRGain(int);
      virtual void SetPGain(int);
      virtual void OutputPort(int);
      virtual void InputPort(int);
      virtual void Obtain();
      virtual void RMute();
      virtual void RUnmute();
      virtual int HalfDuplex() const;
    protected:

      u_char* readptr;
      u_char* readbufend;
      u_char* readbuf;

      u_char* ubufptr;
      u_char* ubufend;
      u_char* ubuf;

      u_char* writeptr;
      u_char* writebufend;
      u_char* writebuf;
};

static class VoxWareAudioMatcher : public Matcher {
    public:
      VoxWareAudioMatcher() : Matcher("audio") {}
      TclObject* match(const char* fmt) {
            if (strcmp(fmt, "voxware") == 0)
                  return (new VoxWareAudio);
            else
                  return (0);
      }
} voxware_audio_matcher;

VoxWareAudio::VoxWareAudio()
{
      readbuf = new u_char[ABUFLEN];
      readptr = readbufend = readbuf + ABUFLEN;

      writeptr = writebuf = new u_char[ABUFLEN];
      writebufend = writebuf + ABUFLEN;

      ubufptr = ubuf = new u_char[blksize];
      ubufend = ubuf + blksize;
      memset(ubuf, ULAW_ZERO, blksize);
}

int VoxWareAudio::HalfDuplex() const
{
      /*XXX change this if full duplex audio device available*/
      return 1;
}

void VoxWareAudio::Obtain()
{
      if (HaveAudio())
            abort();
      fd = open("/dev/audio", O_RDWR|O_NDELAY);
      if (fd >= 0) {
            int on = 1;
            ioctl(fd, FIONBIO, &on);

            int frag = (NFRAG << 16) | ABUFLOG2;
            ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &frag);
#ifdef fullduplex
            Audio::Obtain();
#else
            notify();
#endif
      }
}

void VoxWareAudio::Write(u_char *cp)
{
      if (HaveAudio() && (rmute & 1) != 0) {
            register u_char *cpend = cp + blksize;
            register u_char *wbuf = writeptr;
            register u_char *wend = writebufend;
            for ( ; cp < cpend; cp += 4) {
                  wbuf[0] = cp[0];
                  wbuf[1] = cp[1];
                  wbuf[2] = cp[2];
                  wbuf[3] = cp[3];
                  wbuf += 4;
                  if (wbuf >= wend) {
                        wbuf = writebuf;
                        if (write(fd, (char*)wbuf, ABUFLEN) != ABUFLEN)
                              perror("aud write");
                  }
            }
            writeptr = wbuf;
      }
}

int VoxWareAudio::FrameReady()
{
      if ((rmute & 1) == 0) {
            register u_char* cp = ubufptr;
            register u_char* cpend = ubufend;
            register u_char* rbuf = readptr;
            register u_char* rend = readbufend;

            for ( ; cp < cpend; cp += 4) {
                  if (rbuf >= rend) {
                        rbuf = readbuf;
                        int cc = read(fd, (char*)rbuf, ABUFLEN);
                        if (cc <= 0) {
                              ubufptr = cp;
                              readbufend = rbuf;
                              if (cc == -1 && errno != EAGAIN) {
                                    Release();
                                    Obtain();
                              }
                              return (0);
                        }
                        readbufend = rend = rbuf + cc;
                  }
                  cp[0] = rbuf[0];
                  cp[1] = rbuf[1];
                  cp[2] = rbuf[2];
                  cp[3] = rbuf[3];
                  rbuf += 4;
            }
            readptr = rbuf;
      }
      return (1);
}

u_char* VoxWareAudio::Read()
{
      u_char* cp = ubuf;
      ubufptr = cp;
      return (cp);
}

void VoxWareAudio::SetRGain(int level)
{
      rgain = level;
}

void VoxWareAudio::SetPGain(int level)
{
//    int fd_dev = open("/dev/mixer", O_RDWR|O_NDELAY);
//    if (fd_dev < 0) cout << "can't open device" << endl;
//    cout << "pgain" << level << endl;
//    pgain = level;
//    ioctl(fd, SOUND_MIXER_WRITE_OGAIN , &pgain);
//    close(fd_dev);
}

void VoxWareAudio::OutputPort(int p)
{
      oport = p;
}

void VoxWareAudio::InputPort(int p)
{
      iport = p;
}

void VoxWareAudio::RMute()
{
      rmute |= 1;
}

void VoxWareAudio::RUnmute()
{
      rmute &=~ 1;
}

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