ios wav格式语音文件转文字

2018-01-24 本文已影响457人瑷岚

一、录音设置

NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc]init];

//设置录音格式 AVFormatIDKey==kAudioFormatLinearPCM

[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];

//设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）

[recordSetting setValue:[NSNumber numberWithFloat:16000] forKey:AVSampleRateKey];

//录音通道数 1 或 2

[recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];

//线性采样位数 8、16、24、32

[recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];

//录音的质量

[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

NSString *strUrl = [NSString stringWithFormat:@"%@/%@.wav", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject], [NSString uuid]];

NSURL *url = [NSURL fileURLWithPath:strUrl];

self.recordUrlKey = strUrl;

// self.audioRecord.filePath = strUrl;

NSError *error;

//初始化

_recorder = [[AVAudioRecorder alloc]initWithURL:url settings:recordSetting error:&error];

//开启音量检测

self.recorder.meteringEnabled = YES;

if ([self.recorder prepareToRecord]){

return YES;

}

二、wav 转 m4a 格式

NSURL *audioPath = [NSURL fileURLWithPath:path];

AVURLAsset* audioAsset = [[AVURLAsset alloc] initWithURL:audioPath options:nil];

AVAssetExportSession* exportSession = [[AVAssetExportSession alloc] initWithAsset:audioAsset presetName:AVAssetExportPresetAppleM4A];

NSURL* exportURL = [NSURL fileURLWithPath:[[path componentsSeparatedByString:@".wav"] objectAtIndex:0]];

NSURL* destinationURL = [exportURL URLByAppendingPathExtension:@"m4a"];

exportSession.outputURL = destinationURL;

exportSession.outputFileType = AVFileTypeAppleM4A;

[exportSession exportAsynchronouslyWithCompletionHandler:^{

if (AVAssetExportSessionStatusCompleted == exportSession.status) {

} else if (AVAssetExportSessionStatusFailed == exportSession.status) {

} else {

}

didFinish();

}];

三、m4a 翻译

NSURL *exportURL = [NSURL fileURLWithPath:[[path componentsSeparatedByString:@".wav"] objectAtIndex:0]];

NSURL *destinationURL = [exportURL URLByAppendingPathExtension:@"m4a"];

NSLocale *local =[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"];

SFSpeechRecognizer *localRecognizer =[[SFSpeechRecognizer alloc] initWithLocale:local];

NSURL *url = destinationURL;

if (!url) { [AlertUtil showAlertWithText:@"转换失败"]; return;}

SFSpeechURLRecognitionRequest *res =[[SFSpeechURLRecognitionRequest alloc] initWithURL:url];

__weak typeof(self) weakSelf = self;

[localRecognizer recognitionTaskWithRequest:res resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {

if (error) {

NSLog(@"------------------------语音识别解析======失败,%@",error);

[AlertUtil showAlertWithText:@"转换失败"];