我正在使用来自 Objective-C iOS 应用程序的 iOS 语音识别 API。它适用于 iPhone 6、7,但不适用于 iPhone 5(iOS,10.2.1)。
另请注意,它适用于 iPhone 5s,但不适用于 iPhone 5。
iOS 语音 API 是否可以在 iPhone 5 上运行?您是否必须做任何不同的事情才能使其正常工作,或者有人知道问题可能是什么吗?
基本代码如下。未发生错误,检测到麦克风音量,但未检测到语音。
if (audioEngine != NULL) {
[audioEngine stop];
[speechTask cancel];
AVAudioInputNode* inputNode = [audioEngine inputNode];
[inputNode removeTapOnBus: 0];
}
recording = YES;
micButton.selected = YES;
//NSLog(@"Starting recording... SFSpeechRecognizer Available? %d", [speechRecognizer isAvailable]);
NSError * outError;
//NSLog(@"AUDIO SESSION CATEGORY0: %@", [[AVAudioSession sharedInstance] category]);
AVAudioSession* audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory: AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionDefaultToSpeaker error:&outError];
[audioSession setMode: AVAudioSessionModeMeasurement error:&outError];
[audioSession setActive: true withOptions: AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:&outError];
SFSpeechAudioBufferRecognitionRequest* speechRequest = [[SFSpeechAudioBufferRecognitionRequest alloc] init];
//NSLog(@"AUDIO SESSION CATEGORY1: %@", [[AVAudioSession sharedInstance] category]);
if (speechRequest == nil) {
NSLog(@"Unable to create SFSpeechAudioBufferRecognitionRequest.");
return;
}
speechDetectionSamples = 0;
// This some how fixes a crash on iPhone 7
// Seems like a bug in iOS ARC/lack of gc
AVAudioEngine* temp = audioEngine;
audioEngine = [[AVAudioEngine alloc] init];
AVAudioInputNode* inputNode = [audioEngine inputNode];
speechRequest.shouldReportPartialResults = true;
// iOS speech does not detect end of speech, so must track silence.
lastSpeechDetected = -1;
speechTask = [speechRecognizer recognitionTaskWithRequest: speechRequest delegate: self];
[inputNode installTapOnBus:0 bufferSize: 4096 format: [inputNode outputFormatForBus:0] block:^(AVAudioPCMBuffer* buffer, AVAudioTime* when) {
@try {
long millis = [[NSDate date] timeIntervalSince1970] * 1000;
if (lastSpeechDetected != -1 && ((millis - lastSpeechDetected) > 1000)) {
lastSpeechDetected = -1;
[speechTask finish];
return;
}
[speechRequest appendAudioPCMBuffer: buffer];
//Calculate volume level
if ([buffer floatChannelData] != nil) {
float volume = fabsf(*buffer.floatChannelData[0]);
if (volume >= speechDetectionThreshold) {
speechDetectionSamples++;
if (speechDetectionSamples >= speechDetectionSamplesNeeded) {
//Need to change mic button image in main thread
[[NSOperationQueue mainQueue] addOperationWithBlock:^ {
[micButton setImage: [UIImage imageNamed: @"micRecording"] forState: UIControlStateSelected];
}];
}
} else {
speechDetectionSamples = 0;
}
}
}
@catch (NSException * e) {
NSLog(@"Exception: %@", e);
}
}];
[audioEngine prepare];
[audioEngine startAndReturnError: &outError];
NSLog(@"Error %@", outError);