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/* Copyright © 1997â2000 Jens Kilian
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Be real-time audio interface. Communicates with server.
*/
#include <OS.h>
#include "BeAudio.h"
#include "CsSvInterface.h"
// Constant data.
static const int32 kPortCapacity = 100;
static const char *kDataPortName[] = {
"Csound audio input",
"Csound audio output"
};
// Global variables (ugh).
port_id gADCPort = B_ERROR;
port_id gDACPort = B_ERROR;
static port_id
openConnection(
int forOutput,
int nChannels, int sampleFormat, float sampleRate, size_t bufferSize)
{
port_id serverPort, dataPort;
struct ServerAudioPort request;
status_t status;
const int32 msg = forOutput
? kServerNewAudioOutPort
: kServerNewAudioInPort;
// Find the server port.
if ((serverPort = find_port(kServerPortName)) < B_OK) {
return serverPort;
}
// Open the data port.
if ((dataPort = create_port(kPortCapacity, kDataPortName[forOutput])) < B_OK) {
return dataPort;
}
// Send the request to the server.
request.mPort = dataPort;
request.mNumChannels = nChannels;
request.mSampleFormat = sampleFormat;
request.mSampleRate = sampleRate;
request.mBufferSize = bufferSize;
status = write_port(serverPort, msg, &request, sizeof(request));
if (status < B_OK) {
delete_port(dataPort);
dataPort = (port_id)status;
}
return dataPort;
}
port_id
openADCPort(int nChannels, int sampleFormat, float sampleRate,
size_t bufferSize)
{
return gADCPort =
openConnection(0, nChannels, sampleFormat, sampleRate, bufferSize);
}
port_id
openDACPort(int nChannels, int sampleFormat, float sampleRate,
size_t bufferSize)
{
return gDACPort =
openConnection(1, nChannels, sampleFormat, sampleRate, bufferSize);
}
void
closeADCPort(void)
{
if (gADCPort >= B_OK) {
delete_port(gADCPort);
gADCPort = B_ERROR;
}
}
void
closeDACPort(void)
{
if (gDACPort >= B_OK) {
delete_port(gDACPort);
gDACPort = B_ERROR;
}
}
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