我想开发一个应该支持语音到文本和文本到语音的应用程序，
i）语音到文本 - 程序 - 我使用语音框架进行语音到文本，每当我打开一个应用程序，如果我开始说话，应用程序应该识别语音，并应将语音转换为文本 . 这是工作
ii）文本到语音 - 过程-i已使用AVFoundation和MediaPlayer库如果用户按下播放按钮，它应该将文本，即屏幕上出现的任何内容转换为语音 . 立即工作 .
这是在处理文本到语音时遇到的问题， speech recognizer 识别播放语音并在文本框中再次打印单词 .
示例 - 如果我说“ Hello Good Morning " it is printing in text box and then if i press a play button it is playing a voice Hello Good Morning but at this time speech to text recognize recognize this voice i mean self- recognition and it's printing " Hello Good Morning Hello Good Morning ”
我想在处理 Text To Speech 时停止 Speech To Text 进程
为此，我已停止语音识别请求，而在这里播放语音是代码，
@implementation ViewController
{
SFSpeechAudioBufferRecognitionRequest *recognitionRequest;
SFSpeechRecognitionTask *recognitionTask;
AVAudioEngine *audioEngine;
NSMutableArray *speechStringsArray;
BOOL SpeechToText;
NSString* resultString;
NSString *str ;
NSString *searchString;
NSString *textToSpeak;
}
- (void)viewDidLoad {
[super viewDidLoad];
//Speech To Text ****
speechStringsArray = [[NSMutableArray alloc]init];
// Initialize background audio session
NSError *error = NULL;
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:&error];
if(error) {
NSLog(@"@error: %@", error);
}
[session setActive:YES error:&error];
if (error) {
NSLog(@"@error: %@", error);
}
// Enabled remote controls
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
// Voice setup
self.voicePicker.delegate = self;
self.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-us"];
self.voices = [NSMutableArray arrayWithObjects:
@{@"voice" : @"en-us", @"label" : @"American English (Female)"},
@{@"voice" : @"en-au", @"label" : @"Australian English (Female)"},
@{@"voice" : @"en-gb", @"label" : @"British English (Male)"},
@{@"voice" : @"en-ie", @"label" : @"Irish English (Female)"},
@{@"voice" : @"en-za", @"label" : @"South African English (Female)"},
nil];
// Synthesizer setup
self.synthesizer = [[AVSpeechSynthesizer alloc] init];
self.synthesizer.delegate = self;
// UITextView delegate
self.textView.delegate = self;
// This notifcation is generated from the AppDelegate applicationDidBecomeActive method to make sure that if the play or pause button is updated in the background then the button will be updated in the toolbar
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateToolbar) name:@"updateToolbar" object:nil];
}
-(void)viewDidAppear:(BOOL)animated
{
self.speechRecognizer = [[SFSpeechRecognizer alloc]initWithLocale:[NSLocale localeWithLocaleIdentifier:@"en-US en-UK"]];
self.speechRecognizer.delegate = self;
audioEngine = [[AVAudioEngine alloc]init];
[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus authStatus) {
switch (authStatus) {
case SFSpeechRecognizerAuthorizationStatusAuthorized:
//User gave access to speech recognition
NSLog(@"Authorized");
[self start_record];
break;
case SFSpeechRecognizerAuthorizationStatusDenied:
//User denied access to speech recognition
NSLog(@"AuthorizationStatusDenied");
break;
case SFSpeechRecognizerAuthorizationStatusRestricted:
//Speech recognition restricted on this device
NSLog(@"AuthorizationStatusRestricted");
break;
case SFSpeechRecognizerAuthorizationStatusNotDetermined:
//Speech recognition not yet authorized
break;
default:
NSLog(@"Default");
break;
}
}];
//MARK : Interface Builder Actions
}
编码增加速度和音高
- (IBAction)handleSpeedStepper:(UIStepper *)sender
{
double speedValue = self.speedStepper.value;
[self.speedValueLabel setText:[NSString stringWithFormat:@"%.1f", speedValue]];
}
- (IBAction)handlePitchStepper:(UIStepper *)sender
{
double pitchValue = self.pitchStepper.value;
[self.pitchValueLabel setText:[NSString stringWithFormat:@"%.1f", pitchValue]];
}
//播放文本到语音的按钮 - （IBAction）handlePlayPauseButton：（UIBarButtonItem *）sender {
if (self.synthesizer.speaking && !self.synthesizer.paused) {
if (self.pauseSettingSegmentedControl.selectedSegmentIndex == 0) {
// Stop immediately
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];
}
else {
// Stop at end of current word
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryWord];
}
[self updateToolbarWithButton:@"play"];
}
else if (self.synthesizer.paused) {
[self.synthesizer continueSpeaking];
[self updateToolbarWithButton:@"pause"];
}
else {
[self speakUtterance];
[self updateToolbarWithButton:@"pause"];
}
}
//语音到文本的方法 - （void）start_record {
NSError * outError;
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&outError];
[audioSession setMode:AVAudioSessionModeMeasurement error:&outError];
[audioSession setActive:YES withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:&outError];
recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc]init];
AVAudioInputNode *inputNode = audioEngine.inputNode;
if (recognitionRequest == nil) {
NSLog(@"Unable to created a SFSpeechAudioBufferRecognitionRequest object");
}
if (inputNode == nil) {
NSLog(@"Audio engine has no input node ");}
//configure request so that results are returned before audio recording is finished
[recognitionRequest setShouldReportPartialResults:YES];
// A recognition task represents a speech recognition session.
//We keep a reference to the task so that it can be cancelled .
recognitionTask = [self.speechRecognizer recognitionTaskWithRequest:recognitionRequest resultHandler:^(SFSpeechRecognitionResult * result, NSError * error1) {
BOOL isFinal = false;
if ((result = result)) {
NSString *speech = result.bestTranscription.formattedString;
NSLog(@"the speech:%@",speech);
// coding for fixing append string issue
for (int i = 0 ;i <speechStringsArray.count;i++)
{
str = [speechStringsArray objectAtIndex:i];
NSRange range = [speech rangeOfString:str options:NSCaseInsensitiveSearch];
NSLog(@"found: %@", (range.location != NSNotFound) ? @"Yes" : @"No");
if (range.location != NSNotFound) {
resultString = [speech stringByReplacingCharactersInRange:range withString:@""];
speech = resultString;
NSLog(@" the result is : %@",resultString);
}
}
//specific functions - space for second word
if (resultString.length>0) {
self.textView.text = [NSString stringWithFormat:@"%@%@",self.textView.text,resultString];
[speechStringsArray addObject:resultString]; }
//specific function space for first word -Working fine
else
{
[speechStringsArray addObject:speech];
self.textView.text = speech;
}
}
NSLog(@" array %@",speechStringsArray);
isFinal = result.isFinal;
}
if (error1 != nil || isFinal) {
[audioEngine stop];
[inputNode removeTapOnBus:0];
recognitionRequest = nil;
recognitionTask = nil;
[self start_record];
}}];
AVAudioFormat *recordingFormat = [inputNode outputFormatForBus:0];
[inputNode installTapOnBus:0 bufferSize:1024 format:recordingFormat block:^(AVAudioPCMBuffer * _Nonnull buffer, AVAudioTime * _Nonnull when){
[recognitionRequest appendAudioPCMBuffer:buffer];}
];
NSError *error1;
[audioEngine prepare];
[audioEngine startAndReturnError:&error1];}
- (void)speakUtterance
{
NSLog(@"speakUtterance");
didStartSpeaking = NO;
textToSpeak = [NSString stringWithFormat:@"%@", self.textView.text];
AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:textToSpeak];
utterance.rate = self.speedStepper.value;
utterance.pitchMultiplier = self.pitchStepper.value;
utterance.voice = self.voice;
[self.synthesizer speakUtterance:utterance];
[self displayBackgroundMediaFields];
}
- (void)displayBackgroundMediaFields
{
MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageNamed:@"Play"]];
NSDictionary *info = @{ MPMediaItemPropertyTitle: self.textView.text,
MPMediaItemPropertyAlbumTitle: @"TextToSpeech App",
MPMediaItemPropertyArtwork: artwork};
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = info;
}
- (void)updateToolbar
{
if (self.synthesizer.speaking && !self.synthesizer.paused) {
[self updateToolbarWithButton:@"pause"];
}
else {
[self updateToolbarWithButton:@"play"];
}}
- (void)updateToolbarWithButton:(NSString *)buttonType
{
//stopping the speech to text process
if (audioEngine.isRunning) {
[audioEngine stop];
[recognitionRequest endAudio];
}
NSLog(@"updateToolbarWithButton: %@", buttonType);
UIBarButtonItem *audioControl;
if ([buttonType isEqualToString:@"play"]) {
// Play
audioControl = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemPlay target:self action:@selector(handlePlayPauseButton:)];
}
else {
// Pause
audioControl = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemPause target:self action:@selector(handlePlayPauseButton:)];
}
UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
[self.toolbar setItems:@[flexibleItem, audioControl, flexibleItem]];
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent
{
NSLog(@"receivedEvent: %@", receivedEvent);
if (receivedEvent.type == UIEventTypeRemoteControl) {
switch (receivedEvent.subtype) {
case UIEventSubtypeRemoteControlPlay:
NSLog(@"UIEventSubtypeRemoteControlPlay");
if (self.synthesizer.speaking) {
[self.synthesizer continueSpeaking];
}
else {
[self speakUtterance];
}
break;
case UIEventSubtypeRemoteControlPause:
NSLog(@"pause - UIEventSubtypeRemoteControlPause");
if (self.pauseSettingSegmentedControl.selectedSegmentIndex == 0) {
// Pause immediately
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];
}
else {
// Pause at end of current word
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryWord];
}
break;
case UIEventSubtypeRemoteControlTogglePlayPause:
if (self.synthesizer.paused) {
NSLog(@"UIEventSubtypeRemoteControlTogglePlayPause");
[self.synthesizer continueSpeaking];
}
else {
NSLog(@"UIEventSubtypeRemoteControlTogglePlayPause");
if (self.pauseSettingSegmentedControl.selectedSegmentIndex == 0) {
// Pause immediately
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];
}
else {
// Pause at end of current word
[self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryWord];
}
}
break;
case UIEventSubtypeRemoteControlNextTrack:
NSLog(@"UIEventSubtypeRemoteControlNextTrack - appropriate for playlists");
break;
case UIEventSubtypeRemoteControlPreviousTrack:
NSLog(@"UIEventSubtypeRemoteControlPreviousTrack - appropriatefor playlists");
break;
default:
break;
}
}
}
编译指示标记UIPickerViewDelegate方法
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return self.voices.count;
}
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
UILabel *rowLabel = [[UILabel alloc] init];
NSDictionary *voice = [self.voices objectAtIndex:row];
rowLabel.text = [voice objectForKey:@"label"];
return rowLabel;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component
{
NSDictionary *voice = [self.voices objectAtIndex:row];
NSLog(@"new picker voice selected with label: %@", [voice objectForKey:@"label"]);
self.voice = [AVSpeechSynthesisVoice voiceWithLanguage:[voice objectForKey:@"voice"]];
}
pragma mark SpeechSynthesizerDelegate方法
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance
{
// This is a workaround of a bug. When we change the voice the first time the speech utterence is set fails silently. We check that the method willSpeakRangeOfSpeechString is called and set didStartSpeaking to YES there. If this method is not called (silent fail) then we simply request to speak again.
if (!didStartSpeaking) {
[self speakUtterance];
}
else {
[self updateToolbarWithButton:@"play"];
NSLog(@"the text are:%@",self.textView.text);
}}
- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer willSpeakRangeOfSpeechString:(NSRange)characterRange utterance:(AVSpeechUtterance *)utterance
{
didStartSpeaking = YES;
//[self setTextViewTextWithColoredCharacterRange:characterRange];
}
#pragma mark UITextViewDelegate Methods
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
if([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
1 回答
不要初始化ViewDidLoad中的所有内容 . 当您点击按钮将文本转换为语音时，那时将语音转换为文本转换对象为nil也将委托设置为nil . 同样的事情反之亦然 .