Audio Visualization - irrKlang Forum

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	Audio Visualization

illusion Registered User
Quote
2012-11-23 04:36:55

Hello,
I am building an audio visualizer for my Graphics class that reads an mp3 file and generates particle system visualization based on various frequencies in the file.

I have seen few posts on the same topic here. From these posts I have been able to put some code together.


/**********************************************************************/

include <iostream>
include <Audio\irrKlang.h>
			
using namespace irrklang;
using namespace std;


int main(int argc, const char** argv)
{
  // start irrKlang with default parameters
  ISoundEngine* engine = createIrrKlangDevice();
  
  if (!engine)
    return 0; // error starting up the engine
 
 
  irrklang::ISoundSource* sound_source = engine->addSoundSourceFromFile("as.mp3", ESM_NO_STREAMING);
  sound_source->setForcedStreamingThreshold(-1);
  unsigned char* sound_values = (unsigned char*)sound_source->getSampleData();
  int number_of_elements = sizeof(sound_values);
  for(int i=0;i < number_of_elements ;i++)
	  cout << endl << sound_values[i];

  if(sound_values == NULL)
	  cout<<"Problem";
  

  char i = 0;
  engine->play2D("as.mp3");
  std::cin >> i; // wait for user to press a key
  
  engine->drop(); // delete engine

  return 0;
/************************************************************************/

My problems:
When I print the values given but getSampleData();, it print blank new lines. I am fairly new to C++, as such there may be some noobish mistake I am not seeing here.

niko Moderator
Quote
2012-11-24 08:00:02

getSampleData is usually just some bytes, showing the digital wave. Printing it as characters won't show useful information, I guess.

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