source: orxonox.OLD/trunk/src/lib/sound/sound_buffer.cc @ 8305

/*
   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: Benjamin Grauer
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_SOUND

#include "sound_buffer.h"

#include "sound_engine.h"

#include "sdlincl.h"
#include <cassert>
#ifdef HAVE_SDL_SDL_H
#include <SDL/SDL.h>
#include <SDL/SDL_endian.h>
#else
#include <SDL.h>
#include <SDL_endian.h>
#endif
namespace OrxSound
{
  //////////////////
  /* SOUND-BUFFER */
  //////////////////
  /**
   *  Creates a Soundbuffer out of an inputfile
   * @param fileName The name of the File
   */
  SoundBuffer::SoundBuffer(const std::string& fileName)
  {
    this->setClassID(CL_SOUND_BUFFER, "SoundBuffer");
    this->setName(fileName);

    // generate a Buffer
    alGenBuffers(1, &this->bufferID);
    SoundEngine::checkError("Generate Buffer", __LINE__);
    this->loadWAV(fileName);
  }

  SoundBuffer::~SoundBuffer()
  {
    //  SoundEngine::getInstance()->removeBuffer(this);
    alDeleteBuffers(1, &this->bufferID);
    SoundEngine::checkError("SoundBuffer: Delete Buffer", __LINE__);
  }

  /**
   * @brief loads a Waveform from the local fileSystem into this Source.
   * @param fileName the Name of the File to Load.
   * @returns true on success.
   */
  bool SoundBuffer::loadWAV(const std::string& fileName)
  {
    SDL_AudioSpec wavSpec;
    Uint32 wavLength;
    Uint8 *wavBuffer;

    /* Load the WAV */
    if( SDL_LoadWAV(fileName.c_str(), &wavSpec, &wavBuffer, &wavLength) == NULL)
    {
      PRINTF(2)("Could not open %s: %s\n", fileName.c_str(), SDL_GetError());
      return false;
    }
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
                if ( !( wavSpec.format == AUDIO_U8 || wavSpec.format == AUDIO_S8 ) ) {
                        int cnt = wavLength/2;
                        Uint16* wavBufferAsShorts = ( Uint16* )wavBuffer;
                        for ( int i = 0; i < cnt; ++i, ++wavBufferAsShorts )
                                *wavBufferAsShorts = SDL_Swap16( *wavBufferAsShorts );
                }
#endif
    alBufferData(this->bufferID, SoundBuffer::sdlAudioSpecToAlFormat(&wavSpec), 
                        wavBuffer, wavLength, wavSpec.freq);
                        
    SDL_FreeWAV(wavBuffer);
    if (SoundEngine::checkError("Could not load Wave file", __LINE__))
      return true;
    else
      return false;
  }

  /**
   * @brief converts an SDL_AudioSpec into a valid OpenAL AUDIO_FORMAT enumerator
   * @param audiospec the AudioSpec to convert.
   * @returns the AL_FORMAT
   */
  ALenum SoundBuffer::sdlAudioSpecToAlFormat(const SDL_AudioSpec* audiospec)
  {
    assert (audiospec != NULL);
    bool stereo = true;
    bool is16Bit = true;
    if (audiospec->format == AUDIO_U8 || audiospec->format == AUDIO_S8)
      is16Bit = false;
    if (audiospec->channels == 1)
      stereo = false;

    if (!stereo && !is16Bit)
      return AL_FORMAT_MONO8;
    else if (!stereo && is16Bit)
      return AL_FORMAT_MONO16;
    else if (stereo && !is16Bit)
      return AL_FORMAT_STEREO8;
    else if (stereo && is16Bit)
      return AL_FORMAT_STEREO16;
  }
}