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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) 1995-2024 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 <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "spk_input.h"
#include "spk.h"
#include "pipe.h"
#include "tune.h"
#include "tune_builder.h"
#include "ascii.h"
#include "utf8.h"
#include "scr_types.h"
#include "core.h"
#ifdef ENABLE_SPEECH_SUPPORT
struct SpeechInputObjectStruct {
NamedPipeObject *pipe;
};
static
NAMED_PIPE_INPUT_CALLBACK(handleSpeechInput) {
const unsigned char *const buffer = parameters->buffer;
const size_t bufferSize = parameters->length;
const unsigned char *const bufferEnd = buffer + bufferSize;
const unsigned char *from = buffer;
while (from < bufferEnd) {
SayOptions options = 0;
unsigned char colour = SCR_COLOUR_DEFAULT;
int dontSpeak = 0;
int asTune = 0;
while (from < bufferEnd) {
if (*from != ASCII_ESC) break;
if (++from == bufferEnd) break;
switch (*from++) {
case '!':
options |= SAY_OPT_MUTE_FIRST;
break;
case 'b':
if (!prefs.autospeakEmptyLine) dontSpeak = 1;
break;
case 'c':
if (from < bufferEnd) colour = *from++;
break;
case 'd':
if (!prefs.autospeakDeletedCharacters) dontSpeak = 1;
break;
case 'i':
if (!prefs.autospeakInsertedCharacters) dontSpeak = 1;
break;
case 'l':
if (!prefs.autospeakSelectedLine) dontSpeak = 1;
break;
case 'r':
if (!prefs.autospeakReplacedCharacters) dontSpeak = 1;
break;
case 's':
if (!prefs.autospeakSelectedCharacter) dontSpeak = 1;
break;
case 't':
asTune = 1;
break;
case 'w':
if (!prefs.autospeakCompletedWords) dontSpeak = 1;
break;
}
}
const unsigned char *to = memchr(from, ASCII_ESC, (bufferSize - (from - buffer)));
if (!to) to = bufferEnd;
size_t textLength = to - from;
char text[textLength + 1];
memcpy(text, from, textLength);
text[textLength] = 0;
logMessage(LOG_CATEGORY(SPEECH_EVENTS), "speech input: %s", text);
if (options & SAY_OPT_MUTE_FIRST) {
if (asTune || !textLength) {
muteSpeech(&spk, "speech input");
}
}
if (textLength) {
if (asTune) {
TuneBuilder *tb = newTuneBuilder();
if (tb) {
setTuneSourceName(tb, "speech-input");
setTuneSourceIndex(tb, 0);
if (parseTuneString(tb, "p100")) {
if (parseTuneString(tb, text)) {
ToneElement *tune = getTune(tb);
if (tune) tunePlayTones(tune, TPO_FREE);
}
}
destroyTuneBuilder(tb);
}
} else if (!dontSpeak) {
size_t attributesCount = countUtf8Characters(text);
unsigned char attributes[attributesCount + 1];
memset(attributes, colour, attributesCount);
sayUtf8Characters(
&spk, text, attributes,
textLength, attributesCount, options
);
}
}
from = to;
}
return bufferSize;
}
SpeechInputObject *
newSpeechInputObject (const char *name) {
SpeechInputObject *obj;
if ((obj = malloc(sizeof(*obj)))) {
memset(obj, 0, sizeof(*obj));
if ((obj->pipe = newNamedPipeObject(name, handleSpeechInput, obj))) {
return obj;
}
free(obj);
} else {
logMallocError();
}
return NULL;
}
void
destroySpeechInputObject (SpeechInputObject *obj) {
if (obj->pipe) destroyNamedPipeObject(obj->pipe);
free(obj);
}
#endif /* ENABLE_SPEECH_SUPPORT */
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