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rtmacintosh.c

/*  
    rtmacintosh.c:

    Copyright (C) 1995 matt ingalls, John ffitch

    This file is part of Csound.

    The Csound Library is free software; you can redistribute it
    and/or modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    Csound is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with Csound; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA
*/

/*                                                RTAUDIO.C for MAC   */

/*  This module is included when RTAUDIO is defined at compile time.
    It provides an interface between Csound realtime record/play calls
    and the device-driver code that controls the actual hardware.
 */

#include "cs.h"
#include "soundio.h"

#include <Types.h>
typedef struct IOBufferArray
{
  int readndx;                                          /* In Shorts */
  int readsize;                                         /* In bytes  */
  int writendx;                                         /* In Shorts */
Boolean loopback;
short buffer[1];
} IOBufferArray, *IOBufferPtr, **IOBufferHandle;

extern IOBufferHandle iobufhandle;
extern int MacRtBufsize;
extern int MacRtDACIOSize;

void MacRtPlayOpen(int nchanls, int dsize, float eesr);
void MacRtPlay(char *outbuf, int nbytes);
void MacRtPlayClose(void);

void MacRtRecordOpen(int nchanls, int dsize, float eesr);
void MacRtRecord(char *inbuf, int nbytes);
void MacRtRecordClose(void);

static  int     ishift = 0, oshift = 0, oMaxLag;
extern  OPARMS  O;

static int getshift(int dsize)  /* turn sample- or frame-size into shiftsize */
{
        switch(dsize) {
        case 1:  return(0);
        case 2:  return(1);
        case 4:  return(2);
        case 8:  return(3);
        default: die(Str(X_1169,"rtaudio: illegal dsize"));
          return(-1);           /* Not reached */
        }
}

void recopen_(int nchanls, int dsize, float eesr, int scale)
                                /* open for audio input */
{
    oMaxLag = O.oMaxLag;        /* import DAC setting from command line   */
    if (oMaxLag <= 0)           /* if DAC sampframes ndef in command line */
      oMaxLag = IODACSAMPS;     /*    use the default value               */
    /* we don't use nchnls, etc */
    MacRtRecordOpen(nchanls, dsize, eesr);
    ishift = getshift(dsize);
}

void playopen_(int nchanls, int dsize, float eesr, int scale)
                                /* open for audio output */
{
    int b = 0;

    oMaxLag = O.oMaxLag;        /* import DAC setting from command line   */
    if (oMaxLag <= 0)           /* if DAC sampframes ndef in command line */
      oMaxLag = IODACSAMPS;     /*    use the default value               */
    MacSetRtBufSizes(nchanls, dsize);
    MacRtPlayOpen(nchanls, dsize, eesr);
}

int rtrecord_(char *inbuf, int nbytes) /* get samples from ADC */
{
    MacRTRecord(inbuf,nbytes);
    return(nbytes);
}

void rtplay_(char *outbuf, int nbytes) /* put samples to DAC  */
    /* N.B. This routine serves as a THROTTLE in Csound Realtime Performance, */
    /* delaying the actual writes and return until the hardware output buffer */
    /* passes a sample-specific THRESHOLD.  If the I/O BLOCKING functionality */
    /* is implemented ACCURATELY by the vendor-supplied audio-library write,  */
    /* that is sufficient.  Otherwise, requires some kind of IOCTL from here. */
    /* This functionality is IMPORTANT when other realtime I/O is occurring,  */
    /* such as when external MIDI data is being collected from a serial port. */
    /* Since Csound polls for MIDI input at the software synthesis K-rate     */
    /* (the resolution of all software-synthesized events), the user can      */
    /* eliminate MIDI jitter by requesting that both be made synchronous with */
    /* the above audio I/O blocks, i.e. by setting -b to some 1 or 2 K-prds.  */
{
    long sampframes = nbytes >> oshift;
    /*      while ((((*iobufhandle)->writendx + (MacRtBufsize >> 1)) > (*iobufhandle)->readndx) */
    /*              && (*iobufhandle)->loopback == TRUE); */
    MacRtPlay(outbuf, nbytes);
    nrecs++;
}

void rtclose_(void)              /* close the I/O device entirely  */
{                               /* called only when both complete */
    MacRtPlayClose();
    if (O.Linein) {
#ifdef PIPES
      if (O.Linename[0]=='|') _pclose(Linepipe);
      else
#endif
        if (strcmp(O.Linename, "stdin")!=0) close(Linefd);
    }
}


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