benbahrenburg

func UIImageToDataIO(image: UIImage, compressionRatio: CGFloat, orientation: Int = 1) -> Data? {
    return autoreleasepool(invoking: { () -> Data in
        let data = NSMutableData()
        let options: NSDictionary = [
            kCGImagePropertyOrientation: orientation,
            kCGImagePropertyHasAlpha: true,
            kCGImageDestinationLossyCompressionQuality: compressionRatio
        ]
        
        let imageDestinationRef = CGImageDestinationCreateWithData(data as CFMutableData, kUTTypeJPEG, 1, nil)!

jamesmacwhite

Converting mkv to mp4 with ffmpeg

Essentially just copy the existing video and audio stream as is into a new container, no funny business!

The easiest way to "convert" MKV to MP4, is to copy the existing video and audio streams and place them into a new container. This avoids any encoding task and hence no quality will be lost, it is also a fairly quick process and requires very little CPU power. The main factor is disk read/write speed.

With ffmpeg this can be achieved with -c copy. Older examples may use -vcodec copy -acodec copy which does the same thing.

These examples assume ffmpeg is in your PATH. If not just substitute with the full path to your ffmpeg binary.

Single file conversion example

mcxiaoke

//DNS Query Program on Linux
//Author : Silver Moon ([email protected])
//Dated : 29/4/2009
 
//Header Files
#include<stdio.h> //printf
#include<string.h>    //strlen
#include<stdlib.h>    //malloc
#include<sys/socket.h>    //you know what this is for
#include<arpa/inet.h> //inet_addr , inet_ntoa , ntohs etc

fffaraz

//DNS Query Program on Linux
//Author : Silver Moon ([email protected])
//Dated : 29/4/2009
 
//Header Files
#include<stdio.h> //printf
#include<string.h>    //strlen
#include<stdlib.h>    //malloc
#include<sys/socket.h>    //you know what this is for
#include<arpa/inet.h> //inet_addr , inet_ntoa , ntohs etc

Ellein-Keen

// Fetch entities

let fetchRequest = NSFetchRequest(entityName: "Note")
        
var sortDescriptor = NSSortDescriptor(key: "text", ascending: false)
fetchRequest.sortDescriptors = [sortDescriptor]

let predicate = NSPredicate(format: "MyEntityAttribute == %@", "Matching Value")
fetchRequest.predicate = predicate

podkovyrin

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);

size_t height = CVPixelBufferGetHeight(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

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.

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

petewarden

Google Protobuf 3.0.1 - Mac OS X and iOS Support

The script in this gist will help you buid the Google Protobuf library for use with Mac OS X and iOS. Other methods (such as homebrew or direct compilation) have issues that prevent their use. The libraries built by this script are universal and support all iOS device architectures including the simulator.

This gist was adapted from the original at https://gist.github.com/BennettSmith/7150245, and updated to deal with Xcode 7 and iOS 9, and download protobuf version 3.0.0.

schickling

extension UIImage {

    func fixedOrientation() -> UIImage {
        
        if imageOrientation == UIImageOrientation.Up {
            return self
        }
        
        var transform: CGAffineTransform = CGAffineTransformIdentity
        

jsturgis

var mediaJSON = { "categories" : [ { "name" : "Movies",
        "videos" : [ 
		    { "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ],
              "subtitle" : "By Blender Foundation",
              "thumb" : "images/BigBuckBunny.jpg",
              "title" : "Big Buck Bunny"
            },
            { "description" : "The first Blender Open Movie from 2006",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ],