/* * 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) 1995-2021 by The BRLTTY Developers. * * BRLTTY comes with ABSOLUTELY NO WARRANTY. * * This is free software, placed 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. Please see the file LICENSE-LGPL for details. * * Web Page: http://brltty.app/ * * This software is maintained by Dave Mielke . */ #include "prologue.h" #include "log.h" #include "prefs.h" #include "async_wait.h" #include "notes.h" #include "fm.h" struct NoteDeviceStruct { unsigned int channelNumber; }; static NoteDevice * fmConstruct (int errorLevel) { NoteDevice *device; if ((device = malloc(sizeof(*device)))) { if (fmEnablePorts(errorLevel)) { if (fmTestCard(errorLevel)) { device->channelNumber = 0; logMessage(LOG_DEBUG, "FM enabled"); return device; } fmDisablePorts(); } free(device); } else { logMallocError(); } logMessage(LOG_DEBUG, "FM not available"); return NULL; } static void fmDestruct (NoteDevice *device) { free(device); fmDisablePorts(); logMessage(LOG_DEBUG, "FM disabled"); } static int fmTone (NoteDevice *device, unsigned int duration, NoteFrequency frequency) { uint32_t pitch = frequency; logMessage(LOG_DEBUG, "tone: MSecs:%u Freq:%"PRIu32, duration, pitch); if (pitch) { fmPlayTone(device->channelNumber, pitch, duration, prefs.fmVolume); } else { asyncWait(duration); } return 1; } static int fmNote (NoteDevice *device, unsigned int duration, unsigned char note) { return fmTone(device, duration, getNoteFrequency(note)); } static int fmFlush (NoteDevice *device) { return 1; } const NoteMethods fmNoteMethods = { .construct = fmConstruct, .destruct = fmDestruct, .tone = fmTone, .note = fmNote, .flush = fmFlush };