IOS 实现 AAC格式 录音 录音后自动播放

废话不说了 不知道aac可以百度一下 下面直接上代码，一个h文件 一个m文件 搞定！

#import <AVFoundation/AVFoundation.h>
#import <UIKit/UIKit.h>

@interface AudioRecord : NSObject<AVAudioRecorderDelegate, AVAudioPlayerDelegate>

/**
*  获取单例对象
*
*  @return 返回数据库对象
*/
+(AudioRecord *)shareAudioRecord;

/**
*  将要录音
*
*  @return <#return value description#>
*/
- (BOOL)canRecord;

/**
*  停止录音
*/
- (void)stopRecord;

/**
*  开始录音
*/
- (void)onStatrRecord;

/**
*  初始化音频检查
*/
-(void)initRecordSession;

/**
*  初始化文件存储路径
*
*  @return <#return value description#>
*/
- (NSString *)audioRecordingPath;

/**
*  录音器
*/
@property (nonatomic, retain) AVAudioRecorder *audioRecorder;

/**
*  录音播放器
*/
@property (nonatomic, retain) AVAudioPlayer *audioPlayer;

@end

下面是m文件

//
//  AudioRecord.m
//  audio

#import "AudioRecord.h"
@implementation AudioRecord : NSObject

+(AudioRecord *)shareAudioRecord{
static AudioRecord *sharedAccountManagerInstance = nil;

static dispatch_once_t predicate; dispatch_once(&predicate, ^{
sharedAccountManagerInstance = [[self alloc] init];
});
return sharedAccountManagerInstance;
}

/**
*  设置录制的音频文件的位置
*
*  @return <#return value description#>
*/
- (NSString *)audioRecordingPath{

NSString *result = nil;
NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsFolde = [folders objectAtIndex:0];
result = [documentsFolde stringByAppendingPathComponent:@"Recording.aac"];
return (result);

}

/**
*  在初始化AVAudioRecord实例之前，需要进行基本的录音设置
*
*  @return <#return value description#>
*/
- (NSDictionary *)audioRecordingSettings{

NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:

[NSNumber numberWithFloat:44100.0],AVSampleRateKey ,    //采样率 8000/44100/96000

[NSNumber numberWithInt:kAudioFormatMPEG4AAC],AVFormatIDKey,  //录音格式

[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,   //线性采样位数  8、16、24、32

[NSNumber numberWithInt:2],AVNumberOfChannelsKey,      //声道 1，2

[NSNumber numberWithInt:AVAudioQualityLow],AVEncoderAudioQualityKey, //录音质量

nil];
return (settings);
}

/**
*  停止音频的录制
*
*  @param recorder <#recorder description#>
*/
- (void)stopRecordingOnAudioRecorder:(AVAudioRecorder *)recorder{
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];  //此处需要恢复设置回放标志，否则会导致其它播放声音也会变小
[session setActive:YES error:nil];
[recorder stop];
}

/**
*  @param recorder <#recorder description#>
*  @param flag     <#flag description#>
*/
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{

if (flag == YES) {
NSLog(@"录音完成！");
NSError *playbackError = nil;
NSError *readingError = nil;
NSData *fileData = [NSData dataWithContentsOfFile:[self audioRecordingPath] options:NSDataReadingMapped error:&readingError];

AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithData:fileData
error:&playbackError];

self.audioPlayer = newPlayer;

if (self.audioPlayer != nil) {
self.audioPlayer.delegate = self;
if ([self.audioPlayer prepareToPlay] == YES &&
[self.audioPlayer play] == YES) {
NSLog(@"开始播放音频！");
} else {
NSLog(@"不能播放音频！");
}
}else {
NSLog(@"播放失败！");
}

} else {
NSLog(@"录音过程意外终止！");
}
self.audioRecorder = nil;
}

/**
*  初始化音频检查
*/
-(void)initRecordSession
{
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[session setActive:YES error:nil];

}

/**
*  开始录音
*/
- (void)onStatrRecord
{

/**
*  检查权限
*/
if (![self canRecord])
{

[[[UIAlertView alloc] initWithTitle:nil
message:[NSString stringWithFormat:@"应用需要访问您的麦克风。请启用麦克风！"]
delegate:nil
cancelButtonTitle:@"同意"
otherButtonTitles:nil] show];
return;
}

[self initRecordSession];

NSError *error = nil;
NSString *pathOfRecordingFile = [self audioRecordingPath];
NSURL *audioRecordingUrl = [NSURL fileURLWithPath:pathOfRecordingFile];
AVAudioRecorder *newRecorder = [[AVAudioRecorder alloc]
initWithURL:audioRecordingUrl
settings:[self audioRecordingSettings]
error:&error];
self.audioRecorder = newRecorder;
if (self.audioRecorder != nil) {
self.audioRecorder.delegate = self;
if([self.audioRecorder prepareToRecord] == NO){
return;
}

if ([self.audioRecorder record] == YES) {

NSLog(@"录音开始！");

[self performSelector:@selector(stopRecordingOnAudioRecorder:)
withObject:self.audioRecorder
afterDelay:10.0f];

} else {
NSLog(@"录音失败！");
self.audioRecorder =nil;
}
} else {
NSLog(@"auioRecorder实例录音器失败！");
}
}

/**
*  停止录音
*/
- (void)stopRecord{

if (self.audioRecorder != nil) {
if ([self.audioRecorder isRecording] == YES) {
[self.audioRecorder stop];
}
self.audioRecorder = nil;
}

if (self.audioPlayer != nil) {
if ([self.audioPlayer isPlaying] == YES) {
[self.audioPlayer stop];
}
self.audioPlayer = nil;
}
}

/**
*  将要录音
*
*  @return <#return value description#>
*/
- (BOOL)canRecord
{
__block BOOL bCanRecord = YES;
if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending)
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {

[audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {

if (granted) {

bCanRecord = YES;

} else {

bCanRecord = NO;

}

}];

}
}
return bCanRecord;
}

@end

转载请注明：http://www.cnblogs.com/wangmars/ 以上也综合网上大牛的智慧

感谢http://www.cnblogs.com/hanjun/archive/2012/10/30/2747159.html顺便也解决了 录音后播放声音小的问题。