ios学习系列13--多媒体 ios学习笔记

UIImagePickerControllerSourceTypeCamera // 相机
UIImagePickerControllerSourceTypePhotoLibrary // 相册

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
switch (buttonIndex) {
	case 0:
	    // 拍照
	    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
	    break;
	case 1:
	    // 相册
	    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
	    break;
}
	
// 设置代理
picker.delegate = self;

// 展示控制器
[self presentViewController:picker animated:YES completion:nil];

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
	_imageView.image = info[UIImagePickerControllerOriginalImage];
	    
	[picker dismissViewControllerAnimated:YES completion:nil];
}

// 加载视频资源
NSString *urlString = [[NSBundle mainBundle] pathForResource:@"sample_iTunes" ofType:@"mov"];
NSURL *url = [NSURL fileURLWithPath:urlString];

// 创建播放器
_player = [[MPMoviePlayerController alloc] initWithContentURL:url];

// 设置尺寸
_player.view.frame = self.view.bounds;
_player.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

// 添加到控制器的view上
[self.view addSubview:_player.view];

// 播放
[_player play];

// 监听播放状态的改变
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(videoStateChange) name:MPMoviePlayerPlaybackStateDidChangeNotification object:_player];

// 监听播放器结束全屏
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(exitFullscreen) name:MPMoviePlayerDidExitFullscreenNotification object:_player];

// 截取视频中的图片
- (void)requestThumbnailImagesAtTimes:(NSArray *)playbackTimes timeOption:(MPMovieTimeOption)option;

MPMoviePlayerViewController *play = [[MPMoviePlayerViewController alloc] initWithContentURL:url];

// 1.获得音效文件的路径
NSURL *url = [[NSBundle mainBundle] URLForResource:@"test.wav" withExtension:nil];

// 2.加载音效文件，得到对应的音效ID
SystemSoundID soundID = 0;
AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &soundID);

// 3.播放音效
AudioServicesPlaySystemSound(soundID);

// 加载音效文件
AudioServicesCreateSystemSoundID(CFURLRef inFileURL, SystemSoundID *outSystemSoundID)

// 释放音效资源
AudioServicesDisposeSystemSoundID(SystemSoundID inSystemSoundID)

// 播放音效
AudioServicesPlaySystemSound(SystemSoundID inSystemSoundID)

// 播放音效带点震动
AudioServicesPlayAlertSound(SystemSoundID inSystemSoundID)

// 转换aiff格式
afconvert -f AIFF -d I8 filename

// 转换caf格式
afconvert -f caff -d aac -b 32000 filename

// 批量转换
find . -name '*.mp3' -exec afconvert -f caff -d aac -b 32000 {} \;

// 加载音乐文件
- (id)initWithContentsOfURL:(NSURL *)url error:(NSError **)outError;
- (id)initWithData:(NSData *)data error:(NSError **)outError;

// 准备播放（缓冲，提高播放的流畅性）
- (BOOL)prepareToPlay;

// 播放（异步播放）
- (BOOL)play;

// 暂停
- (void)pause;

// 停止
- (void)stop;

// 是否正在播放
@property(readonly, getter=isPlaying) BOOL playing;

// 时长
@property(readonly) NSTimeInterval duration;

// 当前的播放位置
@property NSTimeInterval currentTime;