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audio-pc.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.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: audio-pc.cc,v 1.7 96/04/26 04:06:56 van Exp $ (LBL)";
#endif

#include <osfcn.h>
/* XXX */
#include <machine/audioio.h>

class PCAudio : public Audio {
    public:
      PCAudio();
      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 Release();
      virtual void RMute();
      virtual void RUnmute();
    protected:
      int setinfo(struct audio_info*);
      int getinfo(struct audio_info*);
      int GainClip(int);
      int OPort(int);
      int IPort(int);
      void* state;
      u_char* buffer;
};

static class PCAudioMatcher : : public Matcher {
    public:
      PCAudioMatcher() : Matcher("audio") {}
      TclObject* match(const char* fmt) {
            if (strcmp(fmt, "pc") == 0)
                  return (new PCAudio);
            return (0);
      }
} pc_audio_matcher;

PCAudio::PCAudio()
{
      state = new audio_info_t;
      AUDIO_INITINFO((audio_info_t*)state);
      buffer = new u_char[blksize];
}

int PCAudio::OPort(int p)
{
      switch(p) {
      default:
      case output_speaker:
            return (AUDIO_SPEAKER);
      case output_phones:
            return (AUDIO_HEADPHONE);
      }
}

int PCAudio::IPort(int p)
{
      /*XXX*/
      return (0);
}

void PCAudio::Release()
{
      if (fd >= 0) {
            getinfo((audio_info_t*)state);
            Audio::Release();
      }
}

void PCAudio::Obtain()
{
      if (HaveAudio())
            abort();

      fd = open("/dev/audio", O_RDWR|O_NDELAY);
      if (fd >= 0) {
            int on = 1;
            ioctl(fd, FIONBIO, &on);
            audio_info_t* i = (audio_info_t*)state;
            getinfo(i);
            i->record.gain = rgain;
            i->play.gain = pgain;
            i->play.port = OPort(oport);
            i->blocksize = blksize;
            i->mode = AUMODE_RECORD;
            setinfo(i);
            Audio::Obtain();
      }
}

void PCAudio::Write(u_char *cp)
{
      register int len = blksize;
      int cc = write(fd, (char *)cp, len);
      if ((len -= cc) != 0) {
            do {
                  if (cc < 0) {
                        if (errno != EPERM)
                              perror("audio write");
                        return;
                  }
                  cp += cc;
                  cc = write(fd, (char *)cp, len);
                  len -= cc;
            } while (len > 0);
      }
}

int PCAudio::FrameReady()
{
      /* the bsd audio driver does reads in blksize chunks */
      int cc = read(fd, (char *)buffer, blksize);
      if (cc <= 0)
            return (0);

      if (cc != blksize)
            fprintf(stderr, "vat: audio read %d (blksize %d)\n",
                  cc, blksize);
      return (1);
}

u_char* PCAudio::Read()
{
      return (buffer);
}

int PCAudio::GainClip(int level)
{
        if (level < AUDIO_MIN_GAIN)
                return AUDIO_MIN_GAIN;
        else if (level > AUDIO_MAX_GAIN)
                return AUDIO_MAX_GAIN;
        else
                return level;
}

int PCAudio::getinfo(audio_info_t* info)
{
      int sts;
      if (fd < 0)
            sts = 0;
      else
            sts = ioctl(fd, AUDIO_GETINFO, info);
      return (sts);
}

int PCAudio::setinfo(audio_info_t* info)
{
      int sts;
      if (fd < 0)
            sts = 0;
      else
            sts = ioctl(fd, AUDIO_SETINFO, info);
      return (sts);
}

void PCAudio::SetRGain(int level)
{
      audio_info_t info;

      rgain = GainClip(level);
      AUDIO_INITINFO(&info);
      info.record.gain = rgain;
      setinfo(&info);
}

void PCAudio::SetPGain(int level)
{
      audio_info_t info;

      pgain = GainClip(level);
      AUDIO_INITINFO(&info);
      info.play.gain = pgain;
      setinfo(&info);
}

void PCAudio::OutputPort(int p)
{
      audio_info_t info;

      oport = p;
      AUDIO_INITINFO(&info);
      info.play.port = OPort(p);
      setinfo(&info);
}

void PCAudio::InputPort(int p)
{
      audio_info_t info;

      iport = p;
      AUDIO_INITINFO(&info);
      info.play.port = IPort(p);
      setinfo(&info);
}

void PCAudio::RMute()
{
      rmute |= 1;
      audio_info_t* i = (audio_info_t*)state;
      i->mode = AUMODE_PLAY;
      setinfo(i);
}

void PCAudio::RUnmute()
{
      rmute &=~ 1;
      audio_info_t* i = (audio_info_t*)state;
      i->mode = AUMODE_RECORD;
      setinfo(i);
}

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