iPhone 5 上的语音识别

Question

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应该在iPhone 5上运行吗？您是否必须做任何不同的事情才能使其工作，或者有谁知道问题可能是什么？

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);

Answer 1

我认为错误在此代码中：

long millis = [[NSDate date] timeIntervalSince1970] * 1000;

32位设备(iPhone 5是32位设备(最多可以保存2^32-1，即2,147,483,647。

我在iPhone 5模拟器上检查了一下，米利斯的值为负数。在您发布的代码片段中，没有提到最初将其设置为 -1 后如何设置lastSpeechDetected，但如果以某种方式((millis - lastSpeechDetected) > 1000)为 true，那么它将进入 if 块并完成语音任务。