介绍
- 录音使用的也是AVFoundation框架
- 相关类：AVAudioRecorder
- 可以设置的一些属性 :
<1>AVNumberOfChannelsKey 通道数
<2>AVSampleRateKey 采样率 一般用44100
<3>AVLinearPCMBitDepthKey 比特率 一般设16 32
<4>AVEncoderAudioQualityKey 质量
<5>AVEncoderBitRateKey 比特采样率 一般是128000
使用
代码示例
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()<AVAudioRecorderDelegate>
{
AVAudioRecorder *audioRecorder;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(100, 100, 100, 100);
button.backgroundColor = [UIColor colorWithRed:0.6223 green:0.4564 blue:0.9735 alpha:1.0];
[button setTitle:@"Play" forState:UIControlStateNormal];
[button setTitle:@"Pause" forState:UIControlStateSelected];
[button addTarget:self action:@selector(recorder:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
[self startAudioRecorder];
}
-(void)recorder:(UIButton *)sender{
sender.selected = !sender.selected;
sender.selected != YES?[audioRecorder stop]:[audioRecorder record];
}
-(void)startAudioRecorder{
/*
URL：是本地的URL 是AVAudioRecorder 需要一个存储的路径
*/
NSString *name =[NSString stringWithFormat:@"%d.aiff",(int)[NSDate date].timeIntervalSince1970];
NSString *path = [[ NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,YES) firstObject] stringByAppendingPathComponent:name];
NSError *error;
//初始化
/**
AVNumberOfChannelsKey:声道数 通常为双声道 值2
AVSampleRateKey：采样率 单位是HZ 通常设置成44100 44.1k
AVLinearPCMBitDepthKey：比特率 8 16 32
AVEncoderAudioQualityKey：声音质量 需要的参数是一个枚举 ：
AVAudioQualityMin 最小的质量
AVAudioQualityLow 比较低的质量
AVAudioQualityMedium 中间的质量
AVAudioQualityHigh 高的质量
AVAudioQualityMax 最好的质量
AVEncoderBitRateKey：音频的编码比特率 BPS传输速率 一般为128000bps
*/
audioRecorder = [[AVAudioRecorder alloc]initWithURL:[NSURL fileURLWithPath:path] settings:@{AVNumberOfChannelsKey:@2,AVSampleRateKey:@44100,AVLinearPCMBitDepthKey:@32,AVEncoderAudioQualityKey:@(AVAudioQualityMax),AVEncoderBitRateKey:@128000} error:&error];
audioRecorder.delegate = self;
[audioRecorder prepareToRecord];
//这个是存储录音文件的路径可以根据这个路径查看是否录音成功
//复制这个路径 点击桌面 commend+shift+G可以找到存放录音文件的文件夹
NSLog(@"%@",path);
}
//获取到录音文件
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{
NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
//NSFileManager文件操作的一个类
NSFileManager *manager = [NSFileManager defaultManager];
//获得当前文件的所有子文件:subpathsAtPath:
NSArray *pathList = [manager subpathsAtPath:path]
;
//需要只获得录音文件
NSMutableArray *audioPathList = [NSMutableArray array];
//遍历这个文件夹下面的子文件
for (NSString *audioPath in pathList) {
//通过对比文件的延展名（扩展名、尾缀）来区分是不是录音文件
if ([audioPath.pathExtension isEqualToString:@"aiff"]) {
//把筛选出来的文件放到数组中 -> 得到所有的音频文件
[audioPathList addObject:audioPath];
}
}
NSLog(@"录音结束");
NSLog(@"%@",pathList);
NSLog(@"%@",audioPathList);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
