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iOS使用AVFoundation展示视频

转载 作者：qq735679552 更新时间：2022-09-28 22:32:09 26 4
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本文实例为大家分享了iOS使用AVFoundation展示视频的具体代码，供大家参考，具体内容如下 。

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//
// Capter2ViewController.m
// IosTest
//
// Created by garin on 13-7-19.
// Copyright (c) 2013年 garin. All rights reserved.
//
 
#import "Capter2ViewController.h"
 
@interface Capter2ViewController ()
@end
@implementation Capter2ViewController
-( void ) dealloc
{
   [session release];
   [super dealloc];
}
 
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
   self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
   if (self) {
     // Custom initialization
   }
   return self;
}
 
- ( void )viewDidLoad
{
   [super viewDidLoad];
   videoPreviewView=[[UIView alloc] initWithFrame:CGRectMake(10, 10, 320, 200)];
   [self.view addSubview:videoPreviewView];
   [videoPreviewView release];
  // Do any additional setup after loading the view.
  
   //在viewdidload调用下面的函数显示摄像信息
   [self setupCaptureSession];
  
//  imgView=[[UIImageView alloc] initWithFrame:CGRectMake(10, 230, 320, 100)];
//  imgView.backgroundColor=[UIColor grayColor];
//  [self.view addSubview:imgView];
//  [imgView release];
  
   UIButton *cloeseBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
   cloeseBtn.frame=CGRectMake(10, 220, 300, 50);
   [cloeseBtn setTitle:@ "Press" forState:UIControlStateNormal];
   [cloeseBtn addTarget:self action:@selector(closeBtnClick:) forControlEvents:UIControlEventTouchUpInside];
   [self.view addSubview:cloeseBtn];
}
 
-( void ) closeBtnClick:(id) sender
{
   [session stopRunning];
}
 
- ( void )didReceiveMemoryWarning
{
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}
 
- ( void )setupCaptureSession
{
   NSError *error = nil;
  
   // Create the session
   session = [[AVCaptureSession alloc] init];
  
   // Configure the session to produce lower resolution video frames, if your
   // processing algorithm can cope. We'll specify medium quality for the
   // chosen device.
   session.sessionPreset = AVCaptureSessionPresetLow;
  
   // Find a suitable AVCaptureDevice
   AVCaptureDevice *device = [AVCaptureDevice
                 defaultDeviceWithMediaType:AVMediaTypeVideo];
  
   // Create a device input with the device and add it to the session.
   AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
                                     error:&error];
   if (!input) {
     // Handling the error appropriately.
   }
   [session addInput:input];
  
   // Create a VideoDataOutput and add it to the session
   AVCaptureVideoDataOutput *output = [[[AVCaptureVideoDataOutput alloc] init] autorelease];
   [session addOutput:output];
  
   // Configure your output.
   dispatch_queue_t queue = dispatch_queue_create( "myQueue" , NULL);
   [output setSampleBufferDelegate:self queue:queue];
   dispatch_release(queue);
  
   // Specify the pixel format
   output.videoSettings =
   [NSDictionary dictionaryWithObject:
    [NSNumber numberWithInt:kCVPixelFormatType_32BGRA]
                 forKey:(id)kCVPixelBufferPixelFormatTypeKey];
  
  
   // If you wish to cap the frame rate to a known value, such as 15 fps, set
   // minFrameDuration.
   //output.minFrameDuration = CMTimeMake(1, 15);
   //AVCaptureConnection *avcaptureconn=[[AVCaptureConnection alloc] init];
   //[avcaptureconn setVideoMinFrameDuration:CMTimeMake(1, 15)];
   // Start the session running to start the flow of data
   [session startRunning];
   AVCaptureVideoPreviewLayer* previewLayer = [AVCaptureVideoPreviewLayer layerWithSession: session];
   previewLayer.frame = videoPreviewView.bounds; //视频显示到的UIView
   previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//  [previewLayer setOrientation:AVCaptureVideoOrientationLandscapeRight];
   //  if(previewLayer.orientationSupported){
   //   previewLayer.orientation = mOrientation;
   //  }
  
   [videoPreviewView.layer addSublayer: previewLayer];
  
   if (![session isRunning]){
     [session startRunning];
   }
  
   // Assign session to an ivar.
   //[self setSession:session];
}
 
//得到视频流
- ( void )captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
     fromConnection:(AVCaptureConnection *)connection
{
   // Create a UIImage from the sample buffer data
   return ;
  
   UIImage *image = [self imageFromSampleBuffer:sampleBuffer];
   //得到的视频流图片
   imgView.image=image;
}
 
// Create a UIImage from sample buffer data
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
   // Get a CMSampleBuffer's Core Video image buffer for the media data
   CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
   // Lock the base address of the pixel buffer
   CVPixelBufferLockBaseAddress(imageBuffer, 0);
  
   // Get the number of bytes per row for the pixel buffer
   void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
  
   // Get the number of bytes per row for the pixel buffer
   size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
   // Get the pixel buffer width and height
   size_t width = CVPixelBufferGetWidth(imageBuffer);
   size_t height = CVPixelBufferGetHeight(imageBuffer);
  
   // Create a device-dependent RGB color space
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  
   // Create a bitmap graphics context with the sample buffer data
   CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
                          bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
   // Create a Quartz image from the pixel data in the bitmap graphics context
   CGImageRef quartzImage = CGBitmapContextCreateImage(context);
   // Unlock the pixel buffer
   CVPixelBufferUnlockBaseAddress(imageBuffer,0);
  
   // Free up the context and color space
   CGContextRelease(context);
   CGColorSpaceRelease(colorSpace);
  
   // Create an image object from the Quartz image
   UIImage *image = [UIImage imageWithCGImage:quartzImage];
  
   // Release the Quartz image
   CGImageRelease(quartzImage);
  
   return (image);
}
 
@end

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我.

原文链接：https://blog.csdn.net/yongyinmg/article/details/9379151 。

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