1

我的 AVAudioRecorder 用于在我的 iOS 应用程序中录制音频时遇到了一个奇怪的情况。我发现一些罕见的 iPad2 设备无法开始录制音频会话。iOS 应用程序代码在所有其他类型的 iPod Touch、iPhone 和 iPad 以及模拟器中记录良好。似乎只是在极少数情况下无法记录。有谁知道为什么会发生这种情况？

这是编码信息。

在我的 .h 文件中，我设置了 AVAudioRecorder ...

RVC.h

@interface RVC : UIViewController <AVAudioRecorderDelegate, AVAudioPlayerDelegate>{
    AVAudioRecorder *audioRecorder;
}
@property (nonatomic, retain) AVAudioRecorder *audioRecorder;

RVC.m

@implementation RVC
@synthesize audioRecorder;

// Set up the file path and name, where the path is to the temporary directory
soundFile = [NSURL fileURLWithPath:[tempDir stringByAppendingFormat:@"theSoundFile.m4a"]];

// Set up the settings for the recording
soundSetting = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat: 44100.0],AVSampleRateKey,
      [NSNumber numberWithInt: kAudioFormatMPEG4AAC], AVFormatIDKey,
      [NSNumber numberWithInt: 2], AVNumberOfChannelsKey,
      [NSNumber numberWithInt: AVAudioQualityHigh], AVEncoderAudioQualityKey, nil];

// Make the AVAudioRecorder with the filename and the sound settings.
self.audioRecorder = [[AVAudioRecorder alloc] initWithURL:soundFile settings:soundSetting error:&error];

// Check to make sure the iOS device has audio hardware that can make a recording
BOOL audioHWAvailable = [[AVAudioSession sharedInstance] inputIsAvailable];
if (! audioHWAvailable) {
   NSLog(@"No audio hardware is available.");
   return;
}

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

// Make sure any output sound is played through the speakers.
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

[[AVAudioSession sharedInstance] setActive:YES error:nil];

// If the audiorecorder is properly set up, then start recording.
if (audioRecorder) {
    [audioRecorder prepareToRecord];
    // Start the recording
    isRecording = [audioRecorder record];
}
else {
    isRecording = FALSE;
    NSLog(@"The audio recorder was not properly set up.");
}

if (isRecording) {
    // The AVAudioSession is recording.
}
else {
    // The AVAudioSession did not start so make some kind of log file.
    NSLog(@"The recording was not started properly.");
    // This is where THE PROBLEM SHOWS UP where it is having trouble with some versions of the iPad2, which I can not replicate in the simulators.
    return;
}
4

1 回答 1

1

您error在 init 调用中传入一个：

self.audioRecorder = [[AVAudioRecorder alloc] initWithURL:soundFile settings:soundSetting error:&error];

但你从来没有读过它。我敢打赌，在失败的情况下，您会在这里遇到错误，导致 audioRecorder 为nil.

于 2012-07-15T14:43:53.973 回答