IOS音频简单处理

首先加载AVFoundation.framework框架，然后加载一首自己喜欢的歌曲 .mp3

其他看代码。。。

#import <UIKit/UIKit.h>

#import "AVFoundation/AVFoundation.h"

@interface ViewController : UIViewController

{

    AVAudioPlayer *player;

    UISlider *proSlider;

    UISlider *volSlider;

    NSTimer *timer;

    UIProgressView *progressView;

}

@end

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    //得到文件路径

    NSString *path = [[NSBundle mainBundle] pathForResource:@"xiguan" ofType:@"mp3"];

    //本地路径 -> URL 

    NSURL *url = [NSURL fileURLWithPath:path];

    //只支持本地文件，不支持在线播放

    player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];

    //准备播放

    [player prepareToPlay];

    //播放速度

    player.enableRate = YES;

    //开启峰值平均检测

    player.meteringEnabled = YES;

    //声道

    NSLog(@"%d",player.numberOfChannels);

    //创建两个Button

    for (int i=0; i<2; i++) {

        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

        button.frame = CGRectMake(110, 10+40*i,100,30);

        button.tag = i;

        [self.view addSubview:button];

        [button addTarget:self action:@selector(playControl:) forControlEvents:UIControlEventTouchUpInside];

    }

    

    

    //创建滑动条

    proSlider = [[UISlider alloc] initWithFrame:CGRectMake(50, 100, 220, 0)];

    //最小值

    proSlider.minimumValue = 0.0;

    //最大值

    proSlider.maximumValue = 1.0;

    //默认值

    proSlider.value = 0.0;

    //滑动事件

    [proSlider addTarget:self action:@selector(progress) forControlEvents:UIControlEventTouchUpInside];

    //添加到视图上

    [self.view addSubview:proSlider];

    [proSlider release];

    

    volSlider = [[UISlider alloc] initWithFrame:CGRectMake(50, 130, 220, 0)];

    volSlider.minimumValue = 0.0;

    volSlider.maximumValue = 1.0;

    volSlider.value = 0.5;

    [volSlider addTarget:self action:@selector(volume) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:volSlider];

    [volSlider release];

    //进度条

    progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(50, 160, 220, 0)];

    [self.view addSubview:progressView];

    [progressView release];

   

}

- (void)volume

{

    //声音 0.0-1.0

    player.volume = volSlider.value;

    //声道 -1.0左声道  0.0  1.0 右声道

    player.pan = volSlider.value;

    //播放速度 0.5半速  1.0 正常  2.0 倍速

    player.rate = volSlider.value;

}

//调节进度

- (void)progress

{

    player.currentTime = player.duration*proSlider.value;

}

- (void)refresh

{

    //播放进度 = 当前时间/总时间

    float pro = player.currentTime/player.duration;

    //刷新进度条

    [proSlider setValue:pro animated:YES];

    //刷新峰值，平均值 0 ~ -160.0

    [player updateMeters];

    //得到峰值

    float peak = [player peakPowerForChannel:0];

    //平均值

    float average = [player averagePowerForChannel:0];

    [progressView setProgress:(average + 160)/160 animated:YES];

}

- (void)playControl:(UIButton*)button

{

    //播放

    if (button.tag == 0) {

        [player play];

        //开始刷新

        timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(refresh) userInfo:nil repeats:YES];

    }

    if (button.tag == 1) {

        //暂停

        [player pause];

        //停止

        //[player stop];

        //结束刷新

        if (timer) {

            [timer invalidate];

            timer = nil;

        }

    }

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end