最近看了不少关于AVFoundation的demo，下面总结一下音视频播放

• <h2>录音功能

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()
/** 录音对象 */
@property (nonatomic, strong) AVAudioRecorder *recorder;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)start {
    // 开始录音
    [self.recorder record];
    
}
- (IBAction)stop {
    [self.recorder stop];
}

#pragma mark - 懒加载代码
- (AVAudioRecorder *)recorder
{
    if (_recorder == nil) {
        // 1.创建沙盒路径
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
        
        // 2.拼接音频文件
        NSString *filePath = [path stringByAppendingPathComponent:@"123.caf"];
        
        // 3.转化成url file://
        NSURL *url = [NSURL fileURLWithPath:filePath];
        
        // 4.设置录音的参数
        NSDictionary *settingRecorder = @{
                                          AVEncoderAudioQualityKey : [NSNumber numberWithInteger:AVAudioQualityLow],
                                          AVEncoderBitRateKey : [NSNumber numberWithInteger:16],
                                          AVSampleRateKey : [NSNumber numberWithFloat:8000],
                                          AVNumberOfChannelsKey : [NSNumber numberWithInteger:2]
                                          };
        
        
        // 5.创建录音对象
        self.recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settingRecorder error:nil];
    }
    return _recorder;
}

• <h2>音频播放
  <h6>这里多用于音药的播放,提供音药名就能播放
  <h6>整了三个方法，分别是开始、暂停、停止

- (IBAction)start {
    [ZJAudioTool playMusicWithFileName:@"1201111234.mp3"];
}

- (IBAction)pause {
    [ZJGAudioTool pauseMusicWithFileName:@"1201111234.mp3"];
}
- (IBAction)stop {
    [ZJAudioTool stopMusicWithFileName:@"1201111234.mp3"];
}

<h6>这里开放几个方法，分别是开始、暂停、停止、和播放音效

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

@interface ZJAudioTool : NSObject

// 播放音乐 fileName:音乐文件
+ (AVAudioPlayer *)playMusicWithFileName:(NSString *)fileName;

// 暂停音乐 fileName:音乐文件
+ (void)pauseMusicWithFileName:(NSString *)fileName;

// 停止音乐 fileName:音乐文件
+ (void)stopMusicWithFileName:(NSString *)fileName;

// 播放音效 soundName:音效文件
+ (void)playSoundWithSoundName:(NSString *)soundName;

@end

#import "ZJAudioTool.h"

@implementationZJAudioTool

static NSMutableDictionary *_soudIDs;
static NSMutableDictionary *_players;

+ (void)initialize
{
    _soudIDs = [NSMutableDictionary dictionary];
    _players = [NSMutableDictionary dictionary];
}

+ (AVAudioPlayer *)playMusicWithFileName:(NSString *)fileName
{
    // 1.创建空的播放器
    AVAudioPlayer *player = nil;
    
    // 2.从字典中取出播放器
    player = _players[fileName];
    
    // 3.判断播放器是否为空
    if (player == nil) {
        // 4.生成对应音乐资源
        NSURL *fileUrl = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
        if (fileUrl == nil) return nil;
        
        // 5.创建对应的播放器
        player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileUrl error:nil];
        
        // 6.保存到字典中
        [_players setObject:player forKey:fileName];
        
        // 7.准备播放
        [player prepareToPlay];
    }
    
    // 8.开始播放
    [player play];
    
    return player;
    
}

+ (void)pauseMusicWithFileName:(NSString *)fileName
{
    // 1.从字典中取出播放器
    AVAudioPlayer *player = _players[fileName];
    
    // 2.暂停音乐
    if (player) {
        [player pause];
    }
}

+ (void)stopMusicWithFileName:(NSString *)fileName
{
    // 1.从字典中取出播放器
    AVAudioPlayer *player = _players[fileName];
    
    // 2.停止音乐
    if (player) {
        [player stop];
        [_players removeObjectForKey:fileName];
        player = nil;
    }
}

+ (void)playSoundWithSoundName:(NSString *)soundName
{
    // 1.创建soundID = 0
    SystemSoundID soundID = 0;
    
    // 2.从字典中取出soundID
    soundID = [_soudIDs[soundName] unsignedIntValue];;
    
    // 3.判断soundID是否为0
    if (soundID == 0) {
        // 3.1生成soundID
        CFURLRef url = (__bridge CFURLRef)[[NSBundle mainBundle] URLForResource:soundName withExtension:nil];
        if (url == nil) return;
        
        AudioServicesCreateSystemSoundID(url, &soundID);
        
        // 3.2将soundID保存到字典中
        [_soudIDs setObject:@(soundID) forKey:soundName];
        
    }
    
    // 4.播放音效
    AudioServicesPlaySystemSound(soundID);
}

@end

• <h2>视频播放

#import "ViewController.h"
#import <AVKit/AVKit.h>
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()
/** 播放器 */
@property (nonatomic, strong) AVPlayerViewController *playerVC;
@end

@implementation ViewController

- (IBAction)play {
    
    [self presentViewController:self.playerVC animated:YES completion:nil];
}

- (AVPlayerViewController *)playerVC
{
    if (_playerVC == nil) {
        
        NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/19954d8f-e2c2-4c0a-b8c1-a4c826b5ca8b/L.mp4"];
        AVPlayerItem *playItem = [AVPlayerItem playerItemWithURL:url];
        AVPlayer *player = [AVPlayer playerWithPlayerItem:playItem];
        
        _playerVC = [[AVPlayerViewController alloc] init];
        _playerVC.player = player;
    }
    return _playerVC;
}


@end