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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2014 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "parameters.h"
#include "async_alarm.h"
#include "program.h"
#include "tune.h"
#include "notes.h"
static const NoteMethods *noteMethods = NULL;
static NoteDevice *noteDevice = NULL;
static AsyncHandle tuneDeviceCloseTimer = NULL;
static int openErrorLevel = LOG_ERR;
void
suppressTuneDeviceOpenErrors (void) {
openErrorLevel = LOG_DEBUG;
}
void
closeTuneDevice (void) {
if (tuneDeviceCloseTimer) {
asyncCancelRequest(tuneDeviceCloseTimer);
tuneDeviceCloseTimer = NULL;
}
if (noteDevice) {
noteMethods->destruct(noteDevice);
noteDevice = NULL;
}
}
ASYNC_ALARM_CALLBACK(handleTuneDeviceCloseTimeout) {
if (tuneDeviceCloseTimer) {
asyncDiscardHandle(tuneDeviceCloseTimer);
tuneDeviceCloseTimer = NULL;
}
closeTuneDevice();
}
static int tuneInitialized = 0;
static void
exitTunes (void *data) {
closeTuneDevice();
tuneInitialized = 0;
}
static int
openTuneDevice (void) {
const int timeout = TUNE_DEVICE_CLOSE_DELAY;
if (noteDevice) {
asyncResetAlarmIn(tuneDeviceCloseTimer, timeout);
} else if ((noteDevice = noteMethods->construct(openErrorLevel)) != NULL) {
if (asyncSetAlarmIn(&tuneDeviceCloseTimer, timeout, handleTuneDeviceCloseTimeout, NULL)) {
if (!tuneInitialized) {
tuneInitialized = 1;
onProgramExit("tunes", exitTunes, NULL);
}
}
} else {
return 0;
}
return 1;
}
int
setTuneDevice (TuneDevice device) {
const NoteMethods *methods;
switch (device) {
default:
methods = NULL;
break;
#ifdef HAVE_BEEP_SUPPORT
case tdBeeper:
methods = &beepNoteMethods;
break;
#endif /* HAVE_BEEP_SUPPORT */
#ifdef HAVE_PCM_SUPPORT
case tdPcm:
methods = &pcmNoteMethods;
break;
#endif /* HAVE_PCM_SUPPORT */
#ifdef HAVE_MIDI_SUPPORT
case tdMidi:
methods = &midiNoteMethods;
break;
#endif /* HAVE_MIDI_SUPPORT */
#ifdef HAVE_FM_SUPPORT
case tdFm:
methods = &fmNoteMethods;
break;
#endif /* HAVE_FM_SUPPORT */
}
if (!methods) return 0;
if (methods != noteMethods) {
closeTuneDevice();
noteMethods = methods;
}
return 1;
}
int
playTune (const TuneElement *tune) {
while (tune->duration) {
if (!openTuneDevice()) return 0;
if (!noteMethods->play(noteDevice, tune->note, tune->duration)) return 0;
tune += 1;
}
return noteMethods->flush(noteDevice);
}
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