【若何快速的开辟一个完整的iOS直播app】(采集篇)

袁峥Seemygo

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媒介
在看这篇之前，假如您还不领会直播道理，请查看这篇文章

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根基常识介绍

AVFoundation: 音视频数据采集需要用AVFoundation框架.
// 捕捉音视频
- (void)setupCaputureVideo
{
    // 1.建立捕捉会话,必需要强引用，不然会被释放
    AVCaptureSession *captureSession = [[AVCaptureSession alloc] init];
    _captureSession = captureSession;
    // 2.获取摄像头设备，默认是后置摄像头
    AVCaptureDevice *videoDevice = [self getVideoDevice:AVCaptureDevicePositionFront];
    // 3.获取声音设备
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    // 4.建立对应视频设备输入对象
    AVCaptureDeviceInput *videoDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];
    _currentVideoDeviceInput = videoDeviceInput;
    // 5.建立对应音频设备输入对象
    AVCaptureDeviceInput *audioDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil];
    // 6.添加到会话中
    // 留意“最好要判定是否能添加输入，会话不克不及添加空的
    // 6.1 添加视频
    if ([captureSession canAddInput:videoDeviceInput]) {
        [captureSession addInput:videoDeviceInput];
    }
    // 6.2 添加音频
    if ([captureSession canAddInput:audioDeviceInput]) {
        [captureSession addInput:audioDeviceInput];
    }
    // 7.获取视频数据输出设备
    AVCaptureVideoDataOutput *videoOutput = [[AVCaptureVideoDataOutput alloc] init];
    // 7.1 设置代办署理，捕捉视频样品数据
    // 留意：队列必需是串行队列，才能获取到数据，并且不克不及为空
    dispatch_queue_t videoQueue = dispatch_queue_create("Video Capture Queue", DISPATCH_QUEUE_SERIAL);
    [videoOutput setSampleBufferDelegate:self queue:videoQueue];
    if ([captureSession canAddOutput:videoOutput]) {
        [captureSession addOutput:videoOutput];
    }
    // 8.获取音频数据输出设备
    AVCaptureAudioDataOutput *audioOutput = [[AVCaptureAudioDataOutput alloc] init];
    // 8.2 设置代办署理，捕捉视频样品数据
    // 留意：队列必需是串行队列，才能获取到数据，并且不克不及为空
    dispatch_queue_t audioQueue = dispatch_queue_create("Audio Capture Queue", DISPATCH_QUEUE_SERIAL);
    [audioOutput setSampleBufferDelegate:self queue:audioQueue];
    if ([captureSession canAddOutput:audioOutput]) {
        [captureSession addOutput:audioOutput];
    }
    // 9.获取视频输入与输出毗连，用于分辩音视频数据
    _videoConnection = [videoOutput connectionWithMediaType:AVMediaTypeVideo];
    // 10.添加视频预览图层
    AVCaptureVideoPreviewLayer *previedLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession];
    previedLayer.frame = [UIScreen mainScreen].bounds;
    [self.view.layer insertSublayer:previedLayer atIndex:0];
    _previedLayer = previedLayer;
    // 11.启动会话
    [captureSession startRunning];
}
// 指定摄像头标的目的获取摄像头
- (AVCaptureDevice *)getVideoDevice:(AVCaptureDevicePosition)position
{
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) {
        if (device.position == position) {
            return device;
        }
    }
    return nil;
}
#pragma mark - AVCaptureVideoDataOutputSampleBufferDelegate
// 获取输入设备数据，有可能是音频有可能是视频
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
    if (_videoConnection == connection) {
        NSLog(@"采集到视频数据");
    } else {
        NSLog(@"采集到音频数据");
    }
}
视频采集额外功能一（切换摄像头）

切换摄像头步调

1.获取当前视频设备输入对象

2.判定当前视频设备是前置仍是后置

3.确定切换摄像头的标的目的

4.按照摄像头标的目的获取对应的摄像头设备

5.建立对应的摄像头输入对象

6.从会话中移除之前的视频输入对象

7.添加新的视频输入对象到会话中


// 切换摄像头
- (IBAction)toggleCapture:(id)sender {
    // 获取当前设备标的目的
    AVCaptureDevicePosition curPosition = _currentVideoDeviceInput.device.position;
    // 获取需要改变的标的目的
    AVCaptureDevicePosition togglePosition = curPosition == AVCaptureDevicePositionFront?AVCaptureDevicePositionBack:AVCaptureDevicePositionFront;
    // 获取改变的摄像头设备
    AVCaptureDevice *toggleDevice = [self getVideoDevice:togglePosition];
    // 获取改变的摄像头输入设备
    AVCaptureDeviceInput *toggleDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:toggleDevice error:nil];
    // 移除之前摄像头输入设备
    [_captureSession removeInput:_currentVideoDeviceInput];
    // 添加新的摄像头输入设备
    [_captureSession addInput:toggleDeviceInput];
    // 记实当前摄像头输入设备
    _currentVideoDeviceInput = toggleDeviceInput;
}
视频采集额外功能二（聚焦光标）

聚焦光标步调

1.监听屏幕的点击

2.获取点击的点位置，转换为摄像头上的点，必需经由过程视频预览图层（AVCaptureVideoPreviewLayer）转

3.设置聚焦光标图片的位置，并做动画

4.设置摄像头设备聚焦模式和曝光模式(留意：这里设置必然要锁定设置装备摆设lockForConfiguration,不然报错)


// 点击屏幕，呈现聚焦视图
- (void)touchesBegan:(NSSet[U] *)touches withEvent:(UIEvent *)event
{
    // 获取点击位置
    UITouch *touch = [touches anyObject];
    CGPoint point = [touch locationInView:self.view];
    // 把当前位置转换为摄像头点上的位置
    CGPoint cameraPoint = [_previedLayer captureDevicePointOfInterestForPoint:point];
    // 设置聚核心光标位置
    [self setFocusCursorWithPoint:point];
    // 设置聚焦
    [self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
}
/**
*  设置聚焦光标位置
*
*  @param point 光标位置
*/
-(void)setFocusCursorWithPoint:(CGPoint)point{
    self.focusCursorImageView.center=point;
    self.focusCursorImageView.transform=CGAffineTransformMakeScale(1.5, 1.5);
    self.focusCursorImageView.alpha=1.0;
    [UIView animateWithDuration:1.0 animations:^{
        self.focusCursorImageView.transform=CGAffineTransformIdentity;
    } completion:^(BOOL finished) {
        self.focusCursorImageView.alpha=0;
    }];
}
/**
*  设置聚焦
*/
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
    AVCaptureDevice *captureDevice = _currentVideoDeviceInput.device;
    // 锁定设置装备摆设
    [captureDevice lockForConfiguration:nil];
    // 设置聚焦
    if ([captureDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
        [captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
    }
    if ([captureDevice isFocusPointOfInterestSupported]) {
        [captureDevice setFocusPointOfInterest:point];
    }
    // 设置曝光
    if ([captureDevice isExposureModeSupported:AVCaptureExposureModeAutoExpose]) {
        [captureDevice setExposureMode:AVCaptureExposureModeAutoExpose];
    }
    if ([captureDevice isExposurePointOfInterestSupported]) {
        [captureDevice setExposurePointOfInterest:point];
    }
    // 解锁设置装备摆设
    [captureDevice unlockForConfiguration];
}
竣事语
后续还会更新更多有关直播的资料，但愿做到教会每一个伴侣从零最先做一款直播app，而且Demo也会慢慢完美.
Demo

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打开YZLiveApp.xcworkspace问题

pod install就能解决

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下载jkplayer库，点击下载

把jkplayer直接拖入到与Classes统一级目次下，直接运行法式，就能成功了

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拖入ijkplayer到与Classes统一级目次下.png

留意不需要打开工程，把jkplayer拖入到工程中，而是直接把jkplayer库拷贝到与Classes统一级目次下就可以了。

错误示范:不要向下面如许操作

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