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/*
rtBe.c:
Copyright (C) 2000 Jens Kilian
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 BeOS */
/* 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 <OS.h>
#include "BeAudio.h"
static char *adcBuffer;
const bigtime_t portTimeout = 5000000;
static int oMaxLag;
extern OPARMS O;
#ifdef PIPES
#define _pclose pclose
#endif
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 */
if (nchanls != 1 && nchanls != 2) {
die(Str(X_1154,"recopen: BeOS supports either one or two channels."));
} else if (!(adcBuffer = malloc(oMaxLag))) {
die(Str(X_1155,"recopen: Cannot allocate ADC buffer."));
} else if (openADCPort(nchanls, O.informat, esr, oMaxLag) < B_NO_ERROR) {
die(Str(X_1156,"recopen: cannot open ADC."));
}
}
void playopen_(int nchanls, int dsize, float esr, int scale)
/* open for audio output */
{
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 */
if (nchanls != 1 && nchanls != 2) {
die(Str(X_1128,"playopen: BeOS supports either one or two channels."));
} else if (openDACPort(nchanls, O.outformat, esr, oMaxLag) < B_NO_ERROR) {
die(Str(X_1129,"playopen: cannot open DAC."));
}
}
int rtrecord_(char *inbuf, int nbytes) /* get samples from ADC */
{
static size_t bufStart = 0;
static size_t bufLimit = 0;
size_t toRead = nbytes;
while (toRead > 0) {
size_t bufSize = bufLimit - bufStart;
if (bufSize > toRead) {
memcpy(inbuf, adcBuffer + bufStart, toRead);
bufStart += toRead;
toRead -= toRead;
} else {
int32 dummy;
ssize_t nRead;
memcpy(inbuf, adcBuffer + bufStart, bufSize);
inbuf += bufSize;
toRead -= bufSize;
nRead =
read_port_etc(gADCPort, &dummy, adcBuffer, oMaxLag,
B_TIMEOUT, portTimeout);
if (nRead < B_NO_ERROR) {
die(Str(X_1171,"rtrecord: error reading from ADC port"));
}
bufStart = 0;
bufLimit = (size_t)nRead;
}
}
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-synthesised 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. */
{
while (nbytes > 0) {
size_t toWrite = (nbytes < oMaxLag) ? nbytes : oMaxLag;
if (write_port_etc(gDACPort, 0, outbuf, toWrite,
B_TIMEOUT, portTimeout) < B_NO_ERROR) {
printf(Str(X_1170,"rtplay: failed write to DAC port\n"));
}
outbuf += toWrite;
nbytes -= toWrite;
}
nrecs++;
}
void rtclose_(void) /* close the I/O device entirely */
{ /* called only when both complete */
closeADCPort();
closeDACPort();
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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