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/*
rtnext.c:
Copyright (C) 1999 S Brandon
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 NeXT */
/* 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 <stdio.h>
#include <sound/sound.h>
#include <sound/sounddriver.h>
#include <mach.h>
int low_water = 48*1024; /* Used by the driver to control the flow of samples */
int high_water = 64*1024; /* Used by the driver to control the flow of samples */
static port_t dev_port, owner_port, write_port, reply_port ;
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 esr, 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 */
die(Str(X_354,"NeXT audio record not available"));
ishift = getshift(dsize);
}
void playopen_(int nchanls, int dsize, float esr, 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 */
{
int protocol, sampleRate;
if (esr > 33075.0)
sampleRate = SNDDRIVER_STREAM_TO_SNDOUT_44 ;
else sampleRate = SNDDRIVER_STREAM_TO_SNDOUT_22 ;
if (esr != 44100.0 && esr != 22050) {
long isr = esr, actual = isr > 33075 ? 44100 : 22050;
sprintf(errmsg,
Str(X_452,"SRate 44.1K or 22.05K only. This %ld playing at %ld"),
isr, actual);
warning(errmsg);
}
if (nchanls != 2)
die(Str(X_355,"NeXT supports nchnls = 2 (stereo) output only"));
SNDAcquire(SND_ACCESS_OUT,0,0,0,NULL_NEGOTIATION_FUN,
0,&dev_port,&owner_port);
snddriver_stream_setup(dev_port, owner_port,
sampleRate, /* make this a switch */
4096, 2, low_water, high_water,
&protocol, &write_port);
snddriver_stream_control(write_port, 0, SNDDRIVER_PAUSE_STREAM);
/* oshift = getshift(dsize); */ /* what's correct here? oshift currently 0 */
} /* perhaps driver-writing takes bytes ? */
}
int rtrecord_(char *inbuf, int nbytes) /* get samples from ADC */
{
/* *********** Code missing ???????? ************ */
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;
snddriver_stream_start_writing(write_port,outbuf,
sampframes,1,0,0,1,1,1,1,1,0, reply_port);
if (nrecs == 3)
snddriver_stream_control(write_port, 0, SNDDRIVER_RESUME_STREAM);
nrecs++;
}
void rtclose_(void) /* close the I/O device entirely */
{ /* called only when both complete */
if (dev_port) {
SNDRelease(SND_ACCESS_OUT,dev_port, owner_port) ;
port_deallocate(task_self(),reply_port);
}
}
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