/* 
   orxonox - the future of 3D-vertical-scrollers
   
   Copyright (C) 2004 orx
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
   
   ### File Specific:
   main-programmer: Simon Hofmann 
   co-programmer:
*/

#include "sound_control.h"

using namespace std;

SoundControl* SoundControl::instance = NULL;
int volume = SDL_MIX_MAXVOLUME;
int track_number = 1;
static Mix_Music* music = NULL;
int audio_rate = MIX_DEFAULT_FREQUENCY, audio_channels = MIX_DEFAULT_CHANNELS, audio_buffers = 16384, bits = 0; 
Uint16 audio_format = MIX_DEFAULT_FORMAT;


/** 
    \brief standard constructor 
    
    This constructor builds a SoundControl Object, which waits for callers.
    All sound output is handled by this singleton object.
*/ 
SoundControl::SoundControl () { 

  /*
  initializing sound and calling Mix_OpenAudio 
  if(SDL_Init(SDL_INIT_AUDIO)<0){ 
    printf("SDL_Init: INIT_AUDIO error.\n"); 
  } 
  */
  
  if(Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers)){ 
    printf("Mix_OpenAudio: Failed to open audio!\n"); 
  } 
  
  initialise();
}


/** 
    \brief Default destructor 
*/ 
SoundControl::~SoundControl () { 
}

/**
   \brief Returns a reference to the singleton
*/
SoundControl* SoundControl::getInstance() {
  if (instance == NULL) {
    instance = new SoundControl;
  }
  return instance;
}

void SoundControl::deleteInstance() {
  delete instance;
  instance = NULL;
}

/** 
    \brief Is called by SoundControl object to initiate all values 
*/ 
void SoundControl::initialise() { 
  
  // Print some info 
  Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels); 
  bits=audio_format&0xFF; 
  printf("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", audio_rate, bits, audio_channels > 1 ? "stereo" : "mono", audio_buffers ); 
  Mix_VolumeMusic(volume);
} 


/** 
    \brief Sets the number of output Channels (should not be used)
*/ 
void SoundControl::setNumberOfChannels (int number_of_channels) { 
  Mix_AllocateChannels(number_of_channels);
} 


/** 
    \brief May be called from any WorldEntity to play a .xm file 
    \param filename: self-explanatory 
*/ 
int SoundControl::playMod (char* fileName) {
  Mix_Chunk* chunk = NULL; 
  chunk = Mix_LoadWAV(fileName); 
  if(Mix_PlayChannel(-1, chunk, 0) == -1) {
    printf("Mix_PlayChannel: %s\n", Mix_GetError());
  }
}


/** 
    \brief May be called from any WorldEntity to play a .wav file 
    \param filename: self-explanatory 
*/ 
int SoundControl::playWav (char* fileName) {
  Mix_Chunk* chunk = NULL; 
  chunk = Mix_LoadWAV(fileName); 
  if(Mix_PlayChannel(-1, chunk, 0) == -1) {
    printf("Mix_PlayChannel: %s\n", Mix_GetError());
  }
} 


/** 
    \brief May be called from any WorldEntity to play a .ogg file 
    \param filename: self-explanatory 
*/ 
int SoundControl::playOgg (char* fileName) {
  Mix_Music* music = NULL;
  music = Mix_LoadMUS(fileName);
  if(Mix_PlayMusic(music, 1) == -1){
    printf("Mix_PlayMusic: %s\n",Mix_GetError());
  }
  Mix_HookMusicFinished(musicDone);
} 


/** 
    \brief Heightens the overall volume of output 
*/ 
void SoundControl::volumeUp () { 
  volume = (volume + 1) << 1; 
  if(volume > SDL_MIX_MAXVOLUME) 
    volume = SDL_MIX_MAXVOLUME; 
  Mix_VolumeMusic(volume); 
} 


/** 
    \brief Lowers the overall volume of output 
*/  
void SoundControl::volumeDown () { 
  volume >>= 1; 
  Mix_VolumeMusic(volume); 
} 


/** 
    \brief Rewinds music to the beginning 
*/  
void SoundControl::trackRewind () { 
  Mix_RewindMusic(); 
} 


/** 
    \brief Rewinds the music 5 seconds 
*/  
void SoundControl::forwardMusic () { 
  Mix_SetMusicPosition(+5); 
} 


/** 
    \brief Forwards the music 5 seconds 
*/  
void SoundControl::rewindMusic () { 
  Mix_SetMusicPosition(-5); 
} 


/** 
    \brief Pauses music output 
*/ 
void SoundControl::pauseMusic () {
  Mix_PauseMusic();
} 


/** 
    \brief this function pauses music output 
*/ 
void SoundControl::resumeMusic () {
  Mix_ResumeMusic();
} 


/** 
    \brief Hooked by playOgg at end of .ogg playback
*/ 
void SoundControl::musicDone() {
  Mix_HaltMusic();
  Mix_FreeMusic(music);
  music = NULL;
}