#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
{

    AVAudioRecorder *recorder;//錄音對象
    AVAudioPlayer *player;//播放對象
    NSURL *fileUrl;//文件路徑
    
}
@end

//按下錄音
- (IBAction)recoder:(id)sender {
    //(1)url
    NSString *urlStr = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/recoder.aac"];
    
    //刪除之前的錄音
    [[NSFileManager defaultManager]removeItemAtPath:urlStr error:nil];
    
    
    fileUrl = [NSURL fileURLWithPath:urlStr];
    
    
    
    //(2)設置錄音的音頻參數(shù)
    /*
     1 ID號:acc
     2 采樣率(HZ):每秒從連續(xù)的信號中提取并組成離散信號的采樣個數(shù)
     3 通道的個數(shù):(1 單聲道 2 立體聲)
     4 采樣位數(shù)(8 16 24 32) 衡量聲音波動變化的參數(shù)
     5 大端或者小端 (內存的組織方式)
     6 采集信號是整數(shù)還是浮點數(shù)
     7 音頻編碼質量
     
     
     */
    NSDictionary *info = @{
                           AVFormatIDKey:[NSNumber numberWithInt:kAudioFormatMPEG4AAC],//音頻格式
                           AVSampleRateKey:@1000,//采樣率
                           AVNumberOfChannelsKey:@2,//聲道數(shù)
                           AVLinearPCMBitDepthKey:@8,//采樣位數(shù)
                           AVLinearPCMIsBigEndianKey:@NO,
                           AVLinearPCMIsFloatKey:@NO,
                           AVEncoderAudioQualityKey:[NSNumber numberWithInt:AVAudioQualityMedium],
            
                           };
    
    
    /*
     url:錄音文件保存的路徑
     settings: 錄音的設置
     error:錯誤
     */
    recorder = [[AVAudioRecorder alloc]initWithURL:fileUrl settings:info error:nil];
    
    [recorder prepareToRecord];
    [recorder record];
    
    
    
}

//抬手結束錄音
- (IBAction)stopRecoder:(id)sender {
    [recorder stop];
    
    //手動釋放
    recorder =nil;
    
    
}

//播放錄音
- (IBAction)playRecoder:(id)sender {
    
    //多次播放的時候
    player = nil;
    
    player = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
    
    if (player) {
        
        [player prepareToPlay];
        [player play];
        
    }
}