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audio-sock.cc

/*
 * Copyright (c) 1993-1994 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-sock.cc,v 1.14 96/04/26 04:08:15 van Exp $ (LBL)";
#endif

#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "audio.h"
#include "Tcl.h"

class SocketAudio : public Audio {
    public:
      SocketAudio(const char *filename);
      virtual int FrameReady();
      virtual u_char* Read();
      virtual     void Write(u_char *);
      virtual void Obtain();
      virtual void Release();
    protected:
      u_char* buf_;
      u_char* bufcur_;
      u_char* bufend_;
      sockaddr_un sockaddr_;
      int socklen_;
      int lock_;
};

static class SocketAudioMatcher : public Matcher {
    public:
      SocketAudioMatcher() : Matcher("audio") {}
      TclObject* match(const char* id) {
            /* XXX assume socket pathname starts with slash */
            if (*id == '/') 
                  return (new SocketAudio(id));
            else
                  return (0);
      }
} socket_audio_matcher;

SocketAudio::SocketAudio(const char *name)
{
      sockaddr_.sun_family = AF_UNIX;
      strcpy(sockaddr_.sun_path, name);
      socklen_ = strlen(sockaddr_.sun_path) + 2;
      bufcur_ = buf_ = new u_char[blksize];
      bufend_ = buf_ + blksize;
      openlock();
}

void SocketAudio::Release()
{
      if (HaveAudio()) {
            unlock();
            Audio::Release();
      }
}

void SocketAudio::Obtain()
{
      if (HaveAudio())
            abort();
      if (lock() == 0) {
            fd = socket(AF_UNIX, SOCK_STREAM, 0);
            if (fd < 0) {
                  perror("vat: socket");
                  exit(1);
            }
            if (connect(fd, (sockaddr*)&sockaddr_, socklen_) < 0) {
                  if (errno != ECONNREFUSED && errno != ENOENT)
                        perror("vat: audio connect");
                  close(fd);
                  fd = -1;
                  unlock();
                  return;
            }
            bufcur_ = buf_;
            Audio::Obtain();
      }
}

void SocketAudio::Write(u_char *cp)
{
      if (HaveAudio())
            (void)write(fd, (char *)cp, blksize);
}

int SocketAudio::FrameReady()
{
      register int len = bufend_ - bufcur_;
      while (len > 0) {
            int cc = read(fd, (char *)bufcur_, len);
            if (cc == 0) {
                  Release();
                  return (0);
            }
            if (cc < 0) {
                  switch (errno) {
                  case EINVAL:
                        /* probably wrapped file pos. */
                        lseek(fd, 0, SEEK_SET);
                        cc = 0;
                        break;

                  case EPERM:
                        /* probably lost audio */
                        goto out;

                  case EWOULDBLOCK:
                        /* should warn about audio_bsize here */
                        goto out;

                  default:
                        perror("vat: audio read");
                        return (0);
                  }
            }
            bufcur_ += cc;
            len -= cc;
      }
    out:
      return (bufcur_ >= bufend_);
}

u_char* SocketAudio::Read()
{
      bufcur_ = buf_;
      return (buf_);
}

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