1 ENGI 2420 Structured Programming (Lab Tutorial 7) Memorial University of Newfoundland

ENGI 2420 – Structured Programming Lab Tutorial 7 2 Preferences in Eclipse  Warning message “no newline at end of file”  How to enable automatic newline insertion in Eclipse check Window -> Preferences -> C/C++ -> Editor -> Ensure newline at end of file when saving  How to show line number in Eclipse check Window -> Preferences -> General -> Editors -> Text Editors -> Show line numbers

ENGI 2420 – Structured Programming Lab Tutorial 7 3 Assignment-7  Purpose of this assignment a filter to implement a fuzzbox effect on a sound (music) file or an echo effect  Structure of C++ files - assign7.h (downloadable): contains the declarations for the functions - a7main.cpp (downloadable): main function that can be used as test code - assign7.cpp: contains your implemented functions (only submit this one via web-submit) - you may want to create your own test code in a separate.cpp file (do NOT submit your test code)

ENGI 2420 – Structured Programming Lab Tutorial 7 4 readSoundData  int readSoundData(int snd[])  Read the sound data from cin and store it in snd, which can be assumed to be big enough for at least MAX_SND_SIZE (500000) samples. Return the number of samples read, if successful. If the number of samples input is invalid, then return 0

ENGI 2420 – Structured Programming Lab Tutorial 7 5 Data Format  Must be strictly adhered to so that your program can interact with MMGood  The data consists of a sequence of integers each on a separate line  The first number is to be interpreted as the number of samples to follow (i.e., the size of the data), while the remaining numbers are the data

ENGI 2420 – Structured Programming Lab Tutorial 7 6 writeSoundData  void writeSoundData(int snd[], int size)  Output (to cout) the size samples in snd using the format described above

ENGI 2420 – Structured Programming Lab Tutorial 7 7 fuzzBox  int fuzzBox(int snd[], int size, int clip)  Clip the size samples in snd to a maximum amplitude (magnitude) of clip. Elements of snd whose magnitude is greater than clip should be set to clip or -clip appropriately, so as not to change the sample's sign. Return the number of samples that had their value changed.

ENGI 2420 – Structured Programming Lab Tutorial 7 8 fuzzBox  Example:  Initial value of the array  clip = 100  Final value of the array

ENGI 2420 – Structured Programming Lab Tutorial 7 9 echoBox  void echoBox(int snd[], int size, int delayTime)  Add a delayed copy of the sound to the sound  Example and the delay time is 2, then the final value of the sample will be

ENGI 2420 – Structured Programming Lab Tutorial 7 10 Running the Program  Our main program uses a "program argument" to select the effect (fuzz or echo). 0 is for fuzz and 1 is for echo  Windows: from the (windows) command line you launch your program as follows: C:\My Documents\courses\sp\workspace\A7>.\debug\A7 0 or C:\My Documents\courses\sp\workspace\A7>.\debug\A7 1  In Eclipse, you can use the "Run > Open Run Dialog..." command and then edit the "program arguments" to be either "0" or "1" to select fuzzBox or echoBox respectively

ENGI 2420 – Structured Programming Lab Tutorial 7 11 Running with MMGood  MMGood is a java program that will execute your program on actual.wav files so you can hear them working  Download mmgood.jar to your hard drive  Download the sample.wav files: engage.wav and guitar.wav  For windows –Download mmgood.bat and put it in the same directory –Double click on mmgood.bat  For unix/linux/mac –Download mmgood.sh to the same directory –Make this file executable. –Execute the mmgood.sh file

ENGI 2420 – Structured Programming Lab Tutorial 7 12 Running with MMGood  Once mmgood's main window has appeared, and you have compiled your project, you can –Load an input.wav file –Play the input.wav file

ENGI 2420 – Structured Programming Lab Tutorial 7 13 Running with MMGood –Select your assignment 7 executable. (It is in the Debug subdirectory of your project directory and, in Windows, its name will end with ".exe".) –Set the argument to be 0 or 1 –Run the executable –Wait patiently for your program to finish –Play the output sound

ENGI 2420 – Structured Programming Lab Tutorial 7 14 Running with MMGood –Wait patiently for your program to finish –Play the output sound