Jamel  O'Reilly

Jamel O'Reilly

1660514100

Novocaine: Painless High-Performance Audio on iOS and Mac OS X

An analgesic for high-performance audio on iOS and OSX.

Really fast audio in iOS and Mac OS X using Audio Units is hard, and will leave you scarred and bloody. What used to take days can now be done with just a few lines of code.

Getting Audio

Novocaine *audioManager = [Novocaine audioManager];
[audioManager setInputBlock:^(float *newAudio, UInt32 numSamples, UInt32 numChannels) {
    // Now you're getting audio from the microphone every 20 milliseconds or so. How's that for easy?
    // Audio comes in interleaved, so,
    // if numChannels = 2, newAudio[0] is channel 1, newAudio[1] is channel 2, newAudio[2] is channel 1, etc.
}];
[audioManager play];

Playing Audio

Novocaine *audioManager = [Novocaine audioManager];
[audioManager setOutputBlock:^(float *audioToPlay, UInt32 numSamples, UInt32 numChannels) {
    // All you have to do is put your audio into "audioToPlay".
}];
[audioManager play];

Does anybody actually use it?

Yep. Novocaine is result of three years of work on the audio engine of Octave, Fourier and oScope, a powerful suite of audio analysis apps. Please do check them out!

A thing to note:

The RingBuffer class is written in C++ to make things extra zippy, so the classes that use it will have to be Objective-C++. Change all the files that use RingBuffer from MyClass.m to MyClass.mm.

Want some examples?

Inside of ViewController.mm are a bunch of tiny little examples I wrote. Uncomment one and see how it sounds.
Do note, however, for examples involving play-through, that you should be using headphones. Having the
mic and speaker close to each other will produce some gnarly feedback.

Want to learn the nitty-gritty of Core Audio?

If you want to get down and dirty, if you want to get brave and get close to the hardware, I can only point you to the places where I learned how to do this stuff. Chris Adamson and Michael Tyson are two giants in the field of iOS audio, and they each wrote indispensable blog posts (this is Chris's, this is Michael's). Also, Chris Adamson now has a whole gosh-darned BOOK on Core Audio. I would have done unspeakable things to get my hands on this when I was first starting.

Author: alexbw
Source Code: https://github.com/alexbw/novocaine
License: MIT license

#ios #objective-c 

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Novocaine: Painless High-Performance Audio on iOS and Mac OS X

CellularAutomata.jl: Cellular Automata Simulation toolkit for Julia

Cellular Automata

A cellular automaton is a collection of "colored" cells on a grid of specified shape that evolves through a number of discrete time steps according to a set of rules based on the states of neighboring cells. The rules are then applied iteratively for as many time steps as desired.

mathworld.wolfram.com/CellularAutomaton

Elementary CA

To generate an elementary cellular automaton, use

ca = CellularAutomaton(rule, init, gen)

where rule is the Wolfram code (integer), init is a vector containing the initial starting condition and gen is the number of generations to be computed. For a single starting cell in the middle just omit the init vector.

To generate 15 generations of elementary cellular automaton of rule 90 use

using CellularAutomata

ca90 = CellularAutomaton(90, 16)
                            #                                    
                           # #                                   
                          #   #                                  
                         # # # #                                 
                        #       #                                
                       # #     # #                               
                      #   #   #   #                              
                     # # # # # # # #                             
                    #               #                            
                   # #             # #                           
                  #   #           #   #                          
                 # # # #         # # # #                         
                #       #       #       #                        
               # #     # #     # #     # #                       
              #   #   #   #   #   #   #   #                      
             # # # # # # # # # # # # # # # #                     

Totalistic CA

For a more complex cellular automaton you can change the number of states k the cell can be and the radius r of neighbors that can influence the states. If k is changed to be larger than 2, a totalistic CA is computed where only the average value of all neighbors count. This can be done like this

ca = CellularAutomaton(993, 15, k=3)
                        X                         
                       XXX                        
                      X# #X                       
                     X     X                      
                    XXX   XXX                     
                   X# #X X# #X                    
                  X     #     X                   
                 XXX   ###   XXX                  
                X# #X # X # X# #X                 
               X      # X #      X                
              XXX    ## X ##    XXX               
             X# #X  #   X   #  X# #X              
            X     X### XXX ###X     X             
           XXX   X XX  # #  XX X   XXX            
          X# #X XX###X## ##X###XX X# #X           

2 dimensional CAs

Two dimensional cellular automaton (like Conway's Game of Life) can be created by

ca = CA2d(B, S, init, gen)

where B and S are vectors that have the numbers of neighboring cells that define when cell is born or survives, init (matrix) is the initial starting condition and gen is the number of generations the CA is to be computed.

Game of life is then run for 9 generations for e.g. a turbine pattern by typing

ca = CA2d([3], [2, 3], init, 9)

1st step

   ###### ##        
   ###### ##        
          ##        
   ##     ##        
   ##     ##        
   ##     ##        
   ##               
   ## ######        
   ## ######        
                    

2nd

    ####            
   #    # ##        
   #    #   #       
      ##    #       
   ##    #  #       
  #  #   #  #       
  #  #    ##        
  #    ##           
  #   #    #        
   ## #    #        
       ####         
               
 

3rd

     ##             
    ####            
   # ## ## #        
        ##  #       
   ##  ##  ###      
   #### #  ###      
  #  #   #  #       
 ###  # ####        
 ###  ##  ##        
  #  ##             
   # ## ## #        
       ####         
        ##          
             
   

4th

    #  #            
        #           
         ##         
   # ##      #      
   #  #   #         
  #   # ###         
 #           #      
    ### #   #       
    #   #  #        
 #      ## #        
    ##              
      #             
       #  #         

                    

5th

        ##          
         #          
    ###  ##         
  ### #   #         
  #    # ##         
      # #           
    ## #    #       
    #   # ###       
    ##  ###         
     #              
     ##             

6th

        ##          
     #              
    # #  ##         
  # # ###  #        
  #  ######         
     ## ##          
    ######  #       
   #  ### # #       
    ##  # #         
         #          
     ##             

                    

7th

     #  # #         
   ## # ###         
    #      #        
   ##     #         
                    
    #     ##        
   #      #         
    ### # ##        
    # #  #          
     
           

8th

    ## ## #         
   ##  ## ##        
           #        
   ##               
   ##     ##        
          ##        
   #                
   ## ##  ##        
    # ## ##         

                    

9th

   ###### ##        
   ###### ##        
          ##        
   ##     ##        
   ##     ##        
   ##     ##        
   ##               
   ## ######        
   ## ######        
                                    
                    
                    

Running Tests

To run tests, execute the following command from the root folder of the repository:

julia tests/run_tests.jl

Download Details:

Author: Natj
Source Code: https://github.com/natj/CellularAutomata.jl 
License: MIT license

#julia #math #toolkit 

Jamel  O'Reilly

Jamel O'Reilly

1660514100

Novocaine: Painless High-Performance Audio on iOS and Mac OS X

An analgesic for high-performance audio on iOS and OSX.

Really fast audio in iOS and Mac OS X using Audio Units is hard, and will leave you scarred and bloody. What used to take days can now be done with just a few lines of code.

Getting Audio

Novocaine *audioManager = [Novocaine audioManager];
[audioManager setInputBlock:^(float *newAudio, UInt32 numSamples, UInt32 numChannels) {
    // Now you're getting audio from the microphone every 20 milliseconds or so. How's that for easy?
    // Audio comes in interleaved, so,
    // if numChannels = 2, newAudio[0] is channel 1, newAudio[1] is channel 2, newAudio[2] is channel 1, etc.
}];
[audioManager play];

Playing Audio

Novocaine *audioManager = [Novocaine audioManager];
[audioManager setOutputBlock:^(float *audioToPlay, UInt32 numSamples, UInt32 numChannels) {
    // All you have to do is put your audio into "audioToPlay".
}];
[audioManager play];

Does anybody actually use it?

Yep. Novocaine is result of three years of work on the audio engine of Octave, Fourier and oScope, a powerful suite of audio analysis apps. Please do check them out!

A thing to note:

The RingBuffer class is written in C++ to make things extra zippy, so the classes that use it will have to be Objective-C++. Change all the files that use RingBuffer from MyClass.m to MyClass.mm.

Want some examples?

Inside of ViewController.mm are a bunch of tiny little examples I wrote. Uncomment one and see how it sounds.
Do note, however, for examples involving play-through, that you should be using headphones. Having the
mic and speaker close to each other will produce some gnarly feedback.

Want to learn the nitty-gritty of Core Audio?

If you want to get down and dirty, if you want to get brave and get close to the hardware, I can only point you to the places where I learned how to do this stuff. Chris Adamson and Michael Tyson are two giants in the field of iOS audio, and they each wrote indispensable blog posts (this is Chris's, this is Michael's). Also, Chris Adamson now has a whole gosh-darned BOOK on Core Audio. I would have done unspeakable things to get my hands on this when I was first starting.

Author: alexbw
Source Code: https://github.com/alexbw/novocaine
License: MIT license

#ios #objective-c 

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iOS App Development in the United Arab Emirates

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Want to develop the iOS app in India

WebClues Infotech with its head office in India has created a huge presence across the world over time and has served clients in all of the major countries around the world. WebClues Infotech with a highly skilled development team of 120+ members can help you deliver a better result at a reasonable cost.

Want to know more about our iOS app development services in India?

Visit: https://www.webcluesinfotech.com/iphone-app-development/

Share your requirements https://www.webcluesinfotech.com/contact-us/

View Portfolio https://www.webcluesinfotech.com/portfolio/

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