main.cpp

//============================================================================
// Name        : AudioBase.cpp
// Author      : 
// Version     :
// Copyright   : copyright alright
// Description : Playing sound with alsa library
//============================================================================

#include <iostream>
#include <regex>
#include "WavPlayer.h"

#include <functional>
/**
 * \ Wav player paramters
 */
Audio::AudioParam wavParam {
  SND_PCM_STREAM_PLAYBACK, SND_PCM_ACCESS_RW_INTERLEAVED, {}, {}, 44
};

Audio::AudioParam recoredParam {
  SND_PCM_STREAM_CAPTURE, SND_PCM_ACCESS_RW_INTERLEAVED, SND_PCM_FORMAT_S16_LE, Audio::Channels::stereo, 44100
};


bool compareExtension(std::string& filename, std::string extension)
{
  std::string file_ext = filename.substr(filename.find_last_of(".") + 1);

  if(std::regex_match(file_ext, std::regex{extension, std::regex_constants::icase}))
    return true;
  else
    return false;
}


bool isWavExtension(std::string& filename)
{
  return compareExtension(filename, "wav");
}




/*
 * replace function pointers
 */
using namespace std::placeholders;

class A
{
  std::function<void(char*, size_t)> f;

public:
  int writeI(char* buf, size_t len)
  {
    std::cout <<"write i" << std::endl;
  }

  int writeNI(char* buf, size_t len)
  {
    std::cout <<"write ni" << std::endl;
  }

  void checkStuff()
  {
    f = [=](char* buf, size_t len) {
		  return this->writeNI(buf, len); };

    f = [=](char* buf, size_t len) {
	    return this->writeI(buf, len); };
  }

  void write(char * buf, size_t len)
  {
    f(buf, len);
	}
};


int main(int argc, char* argv[])
{
  std::cout << "ALSA Aplication Test: " << SND_LIB_VERSION_STR << std::endl;

  // get file
  if(argc < 2)
  {
    std::cout << "No file arguments, please call like: ./player /dir/.../song.wav" << std::endl;
    return -1;
  }

  else if(argc > 2)
  {
    std::cout << "To many arguments" << std::endl;
    return -1;
  }

  auto* filenamep = argv[1];
  std::string filename{filenamep};
  std::unique_ptr<Audio::Player> player;

  if(isWavExtension(filename))
    player = std::make_unique<Audio::WavPlayer>(Audio::WavPlayer{"default", wavParam});

  else
    player.reset();

  std::cout << "start playing" << std::endl;
    player.get()->play(filenamep);
  std::cout << "stop playing" << std::endl;


  std::cout << "start playing" << std::endl;
    player.get()->play(filenamep);
  std::cout << "stop playing" << std::endl;

	exit(0);
}