avaudiorecorder

问题 I am recording audio using AVAudioRecorder ,and now i want to get exact time duration of my recorded audio,how can i get that. i have tried this: AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:avAudioRecorder.url options:nil]; CMTime time = asset.duration; double durationInSeconds = CMTimeGetSeconds(time); But my time variable return NULL and durationInSeconds return 'nan',what does that means by nan. UPDATE user1903074 answer have solved my problem but just for curiosity ,is thair any

问题 In my application for recording and playing audio using AVAudioRecorder and AVAudioPlayer I came across a scenario in the case of incoming phone call.While the recording is in progress and if the phone call comes,the audio recorded after the phone call is only recorded.I want the recording recorded after the phone call to be the continuation of the audio recorded before the phone call. I track the interruption occuring in audio recorder using the AVAudioRecorderDelegate methods (void

问题 I'm trying to record user voice in background using AVAudioRecorder but every time i get NO while calling recordForDuration method. I add "audio" to UIBackgroundModes but this don't help. By the way, Everything works perfect in foreground. I'm initializing AVAudioRecorder using this code: NSError* error; if (![[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:&error]) { NSLog(@"Error while setting audio session category. Code - %d, description - \"%@\".", [error

问题 My iPhone app uses "AVAudioRecorder" to make voice recordings. It also uses "UIImagePickerController" to record movies and "MPMoviePlayerController" to play movies. Everything works fine until I do all three things in a row: Record a movie using UIImagePickerController Play back the recorded movie using MPMoviePlayerController Try to make a voice recording using AVAudioRecorder When I call AVAudioRecorder's "record" method in step 3, it returns NO indicating failure, but giving no hints as to

问题 I'm trying to obtain a noise level in my iOS app, using AVAudioRecorder. The code I'm using is: [self.recorder updateMeters]; float decibels = [self.recorder averagePowerForChannel:0]; // 160+db here, to scale it from 0 to 160, not -160 to 0. decibels = 160+decibels; NSLog(@"Decibels: %.3f", decibels); The readings I get, when the phone sits on my desk are at about 90-100dB. I checked this this link and the table I saw there shows that: Vacuum Cleaner - 80dB Large Orchestra - 98dB Walkman at

问题 I used AVAudioRecorder to record the voice.I found that a red bar (just like the bar when you calling in background) will appear under the status bar sometimes when I alloc it and begin to record.How to hide it? 回答1: You can't do that. Every app, including the stock Voice Memos app, will have the bar when it uses the microphone. 来源： https://stackoverflow.com/questions/13391311/how-to-hide-the-red-bar-under-the-ioss-status-when-recording

问题 I have built an app that records an audio clip, and saves it to a file called xxx.m4a . Once the recording is made, I can find this xxx.m4a file on my system and play it back - and it plays back fine. The problem isn't recording this audio track. My problem is playing this audio track back from within the app. // to demonstrate how I am building the recordedFileURL let currentFileName = "xxx.m4a" let dirPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) let

问题 I am trying to play the recorded content simultaneously while recording. Currently I am using AVAudioRecorder for recording and AVAudioPlayer for playing. When I was trying to play the content simultaneously nothing is playing. Please find the pseudo code for what I am doing. If I do the same stuff after stop the recording everything works fine. AVAudioRecorder *recorder; //Initializing the recorder properly. [recorder record]; NSError *error=nil; NSUrl recordingPathUrl; //Contains the

问题 I want to record the user voice and then play it back after some time. Is there any way to do this in Objective-C for iPhone? 回答1: Use AVAudioRecorder for doing this. For more help see this tutorial. Hope this helps. 来源： https://stackoverflow.com/questions/1978698/how-to-record-the-user-voice-in-objective-c-for-iphone

问题 I want to record the user voice and then play it back after some time. Is there any way to do this in Objective-C for iPhone? 回答1: Use AVAudioRecorder for doing this. For more help see this tutorial. Hope this helps. 来源： https://stackoverflow.com/questions/1978698/how-to-record-the-user-voice-in-objective-c-for-iphone