用aac初始化AVAudioRecorder

Question

我想用aac文件格式初始化AVAudioRecorder,但它不起作用......

以下代码有什么问题？

soundFilePath = [soundFilePath stringByAppendingPathExtension:@"aac"];
NSURL *url = [NSURL fileURLWithPath:soundFilePath isDirectory:FALSE];
NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];
[recordSetting setValue:[NSNumber numberWithInt: 'aac '] forKey:AVFormatIDKey];                                     //General Audio Format Settings 
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];                                 //          "
[recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];                                  //          "
[recordSetting setValue:[NSNumber numberWithInt: 32] forKey:AVLinearPCMBitDepthKey];                                //Linear PCM Format Settings 
[recordSetting setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];                             //          "
[recordSetting setValue:[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];                                 //          "
[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityLow] forKey:AVEncoderAudioQualityKey];                //Encoder Settings 
[recordSetting setValue:[NSNumber numberWithInt:96] forKey:AVEncoderBitRateKey];                                    //          "
[recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVEncoderBitDepthHintKey];                               //          "
[recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityLow] forKey:AVSampleRateConverterAudioQualityKey];    //Sample Rate Conversion Settings

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

这个分配只返回零...

任何帮助将不胜感激...!

Answer 1

[recordSetting setValue :[NSNumber numberWithInt:kAudioFormatMPEG4AAC_HE_V2] forKey:AVFormatIDKey]; 其格式是枚举。尝试查看枚举。'aac' 没有 formatIDKey 。它有 aacp 和其他。