sdr = dr ^ 0xfff8000;            *bothout++ = (((sdr + sdl) / 2) >> 8);        }        leftout += step;        rightout += step;    }    return 1;}static struct timeval           last={0,0};//static struct timeval         now;static struct timezone          whocares;void updatesounds(void){    mix();    I_SubmitOutputBuffer(mixbuffer, SAMPLECOUNT);}intaddsfx( int           sfxid,  int           volume,  int           step,  int           seperation ){    static unsigned short       handlenums = 0;     int         i;    int         rc = -1;        int         oldest = mytime;    int         oldestnum = 0;    int         slot;    int         rightvol;    int         leftvol;    // play these sound effects    //  only one at a time    if ( sfxid == sfx_sawup         || sfxid == sfx_sawidl         || sfxid == sfx_sawful         || sfxid == sfx_sawhit         || sfxid == sfx_stnmov         || sfxid == sfx_pistol )    {        for (i=0 ; i<8 ; i++)        {            if (channels[i] && channelids[i] == sfxid)            {                channels[i] = 0;                break;            }        }    }    for (i=0 ; i<8 && channels[i] ; i++)    {        if (channelstart[i] < oldest)        {            oldestnum = i;            oldest = channelstart[i];        }    }    if (i == 8)        slot = oldestnum;    else        slot = i;    channels[slot] = (unsigned char *) S_sfx[sfxid].data;    channelsend[slot] = channels[slot] + lengths[sfxid];    if (!handlenums)        handlenums = 100;        channelhandles[slot] = rc = handlenums++;    channelstep[slot] = step;    channelstepremainder[slot] = 0;    channelstart[slot] = mytime;    // (range: 1 - 256)    seperation += 1;    // (x^2 seperation)    leftvol =        volume - (volume*seperation*seperation)/(256*256);    seperation = seperation - 257;    // (x^2 seperation)    rightvol =        volume - (volume*seperation*seperation)/(256*256);          // sanity check    if (rightvol < 0 || rightvol > 127)        derror("rightvol out of bounds");        if (leftvol < 0 || leftvol > 127)        derror("leftvol out of bounds");        // get the proper lookup table piece    //  for this volume level    // channelleftvol_lookup[slot] = &vol_lookup[(leftvol*master_volume/31)*256];    // channelrightvol_lookup[slot] = &vol_lookup[(rightvol*master_volume/31)*256];    left_volume[slot] = leftvol;    right_volume[slot] = rightvol;    channelids[slot] = sfxid;    return rc;}void outputushort(int num){    static unsigned char        buff[5] = { 0, 0, 0, 0, '\n' };    static char*                badbuff = "xxxx\n";    // outputs a 16-bit # in hex or "xxxx" if -1.    if (num < 0)    {        write(1, badbuff, 5);    }    else    {        buff[0] = num>>12;        buff[0] += buff[0] > 9 ? 'a'-10 : '0';        buff[1] = (num>>8) & 0xf;        buff[1] += buff[1] > 9 ? 'a'-10 : '0';        buff[2] = (num>>4) & 0xf;        buff[2] += buff[2] > 9 ? 'a'-10 : '0';        buff[3] = num & 0xf;        buff[3] += buff[3] > 9 ? 'a'-10 : '0';        write(1, buff, 5);    }}void initdata(void){    int         i;    int         j;        int*        steptablemid = steptable + 128;    for (i=0 ;         i<sizeof(channels)/sizeof(unsigned char *) ;         i++)    {        channels[i] = 0;    }        gettimeofday(&last, &whocares);    for (i=-128 ; i<128 ; i++)        steptablemid[i] = pow(2.0, (i/64.0))*65536.0;    // generates volume lookup tables    //  which also turn the unsigned samples    //  into signed samples    // for (i=0 ; i<128 ; i++)    // for (j=0 ; j<256 ; j++)    // vol_lookup[i*256+j] = (i*(j-128))/127;        for (i=0 ; i<128 ; i++)        for (j=0 ; j<256 ; j++)            // vol_lookup[i*256+j] = (i*(j-128)*256)/127;            volume_lookup[i][j] = (i*(j-128)*256)/127;}void quit(void){    I_ShutdownMusic();    I_ShutdownSound();    exit(0);}fd_set          fdset;fd_set          scratchset;intmain( int           c,  char**        v ){    int         done = 0;    int         rc;    int         nrc;    int         sndnum;    int         sndcnt = 0;    int         handle = 0;        unsigned char       commandbuf[10];    struct timeval      zerowait = { 0, 0 };        int         step;    int         vol;    int         sep;        int         i;    int         waitingtofinish=0;    // init any data    initdata();             I_InitSound(11025, 16);    I_InitMusic();    if (snd_verbose)        fprintf(stderr, "ready\n");        // parse commands and play sounds until done    FD_ZERO(&fdset);    FD_SET(0, &fdset);    while (!done)    {        mytime++;        if (!waitingtofinish)        {            do {                scratchset = fdset;                rc = select(FD_SETSIZE, &scratchset, 0, 0, &zerowait);                if (rc > 0)                {                    //  fprintf(stderr, "select is true\n");                    // got a command                    nrc = read(0, commandbuf, 1);                    if (!nrc)                    {                        done = 1;                        rc = 0;                    }                    else                    {                        //if (snd_verbose)                        //    fprintf(stderr, "cmd: %c", commandbuf[0]);                        switch (commandbuf[0])                        {                        case 'v':                            // get master volume                            read(0, commandbuf, 1);                            master_volume = (commandbuf[0] & 0x1f);                            break;                                                    case 'p':                            // play a new sound effect                            read(0, commandbuf, 4);                            //if (snd_verbose)                            //{                            //  commandbuf[9]=0;                            //  fprintf(stderr, "%s\n", commandbuf);                            //}                            //  p<snd#><step><vol><sep>                            sndnum = commandbuf[0];                            step = commandbuf[1];                            step = steptable[step];                            vol = commandbuf[2];                            sep = commandbuf[3];                            handle = addsfx(sndnum, vol, step, sep);                            // returns the handle                            //  outputushort(handle);                            break;                        case 'l': {                            int bln,tlen;                            read(0, &bln, sizeof(int));                            //fprintf(stderr,"%d in...\n",bln);                            S_sfx[sndcnt].data = malloc(bln);                            // hey, read on a pipewill not always                            // fill the whole buffer 19990203 by Kin                            for(tlen = 0; tlen < bln;) {                                tlen+=read(0, S_sfx[sndcnt].data+tlen, bln-tlen);                            }                            lengths[sndcnt] = bln;                            sndcnt++;                            break;                        }                        case 'q':                            // no '\n' 19990201 by Kin                            //read(0, commandbuf, 1);                            waitingtofinish = 1; rc = 0;                            break;                                                        //case 's':                            //{                            //  int fd;                            //  read(0, commandbuf, 3);                            //  commandbuf[2] = 0;                            //  fd = open((char*)commandbuf, O_CREAT|O_WRONLY, 0644);                            //  commandbuf[0] -= commandbuf[0]>='a' ? 'a'-10 : '0';                            //  commandbuf[1] -= commandbuf[1]>='a' ? 'a'-10 : '0';                            //  sndnum = (commandbuf[0]<<4) + commandbuf[1];                            //  write(fd, S_sfx[sndnum].data, lengths[sndnum]);                            //  close(fd);                            //}                            //break;                        default:                            fprintf(stderr, "Did not recognize command %d\n",commandbuf[0]);                            break;                        }                    }                }                else if (rc < 0)                {                    quit();                }            } while (rc > 0);        }        updatesounds();        if (waitingtofinish)        {            for(i=0 ; i<8 && !channels[i] ; i++);                        if (i==8)                done=1;        }    }    quit();    return 0;}