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// conv_device.C
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
#ifdef __GNUG__
#pragma implementation
#endif
#include "application.h"
#include "conv_device.h"
#include "statusaction.h"
ConverterDevice::ConverterDevice(const char* devName) : device_name(nil) {
setDeviceName(devName);
}
void
ConverterDevice::setDeviceName(const char* name) {
delete [] device_name;
device_name = newstr(name);
}
// to avoid monopolizing the device, it is closed whenever stopped
int
ConverterDevice::stop() {
BUG("ConverterDevice::stop()");
int stat = close(); // must close before doing anything else
if(!stat) Application::error("ConverterDevice::stop: close error.");
return RealConverter::stop() && stat;
}
void
ConverterDevice::fail() {
BUG("ConverterDevice::fail()");
close();
RealConverter::fail();
}
boolean
ConverterDevice::reOpen() {
BUG("ConverterDevice::reOpen()");
close();
if(!open(deviceName(), (willRecord() ? O_RDONLY : O_WRONLY))) {
char msg[128];
sprintf(msg, "ConverterDevice::reOpen: Cannot open %s", deviceName());
error(msg);
return false;
}
return true;
}
int
ConverterDevice::doConversion(StatusAction* askedToStop) {
register addr sound = (addr) pointerToData();
int bytesToGo = dataSize();
int writeBytes = min(writeSize(), dataSize());
Application::inform("Playing...");
int status = true;
while(bytesToGo > 0) {
if((*askedToStop)())
return stop();
int bytesWritten = write(sound, writeBytes);
if(bytesWritten < 0) {
if(errno == EAGAIN || errno == EWOULDBLOCK) {
waitForDevice();
continue;
}
status = false;
break;
}
sound += bytesWritten;
bytesToGo -= bytesWritten;
writeBytes = min(bytesToGo, writeBytes);
#ifdef debug
fprintf(stderr, "\t%d-byte block written. %d bytes remaining.\n", bytesWritten, max(0, bytesToGo));
#endif
}
if(status == false)
error("ConverterDevice::doConversion: write error");
else status = waitForStop(askedToStop);
return stop() && status;
}
int
ConverterDevice::doRecording(StatusAction* askedToStop) {
register addr sound = (addr) pointerToData();
int bytesToGo = dataSize();
int readBytes = min(readSize(), dataSize());
int status = 1;
Application::inform("Recording...");
while(bytesToGo > 0) {
if((*askedToStop)())
break;
int bytesRead = read(sound, readBytes);
if(bytesRead < 0) {
if(errno == EAGAIN || errno == EWOULDBLOCK) {
waitForDevice();
continue;
}
status = false;
break;
}
sound += bytesRead;
bytesToGo -= bytesRead;
readBytes = min(bytesToGo, readBytes);
#ifdef debug
fprintf(stderr, "\t%d bytes read. %d bytes remaining.\n", bytesRead, max(0, bytesToGo));
#endif
}
if(status == false)
error("ConverterDevice::doRecording: read error");
return stop() && status;
}
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