cyndibaby905

- (UIImage *)alteredImageFromSampleBuffer:(CMSampleBufferRef)sampleBuffer 
{
    // Get a reference to the buffer, lock the address, and get a pointer to its data. Easy peasy.
    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
    CVPixelBufferLockBaseAddress(imageBuffer, 0); 
    void *sourceData = CVPixelBufferGetBaseAddress(imageBuffer); 
    
    // Set a bunch of variables we need. The "radius" for the blur kernel needs to be positive and odd. The permute map maps the BGRA channels of the buffer to the ARGB that vImage needs.
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); 
    size_t width = CVPixelBufferGetWidth(imageBuffer); 

cyndibaby905

此处主要参考 http://harryhsu.logdown.com/posts/198416-build-ffmpeg-on-mac-os-109
根据我的编译过程做了适当修改

1. Download NDK
https://developer.android.com/tools/sdk/ndk/index.html
我下载的版本是android-ndk-r10，不同的版本在下面的build脚中本需要修改的地方大致相同.

2. Download ffmpeg source code
下载 ffmpeg（http://www.ffmpeg.org/download.html）
推荐 git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg

cyndibaby905

//
//  AppDelegate.m
//  RuntimeDemo
//
//  Created by hangchen on 11/7/14.
//  Copyright (c) 2014 hangchen. All rights reserved.
//

#import "AppDelegate.h"
#import <objc/runtime.h>

cyndibaby905

//
//  SmartPointer.h
//  MemoryDemo
//
//  Created by HangChen on 5/5/15.
//  Copyright (c) 2015 HangChen. All rights reserved.
//

#ifndef __MemoryDemo__SmartPointer__
#define __MemoryDemo__SmartPointer__

cyndibaby905

@implementation XCDUUID

+ (void) load
{
    // query runtime if NSUUID class already exists, if so => done
    if (objc_getClass("NSUUID"))
    {
        return;
    }