sound.cpp

// This file is part of Einstein Puzzle

// Einstein Puzzle
// Copyright (C) 2003-2005  Flowix Games

// Einstein Puzzle 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
// of the License, or (at your option) any later version.

// Einstein Puzzle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.


#include "sound.h"

#include "resources.h"

#include <iostream>
#include <SDL_events.h>


Sound *sound;


Sound::Sound()
    : enableFx(false), volume(0)
{
    int audio_rate = 22050;
    Uint16 audio_format = AUDIO_S16; /* 16-bit stereo */
    int audio_channels = 2;
    int audio_buffers = 1024;
    disabled = Mix_OpenAudio(audio_rate, audio_format, audio_channels, 
                audio_buffers);
    if (disabled)
        std::cout << "Audio is disabled" << std::endl;
}

Sound::~Sound()
{
    if (! disabled)
        Mix_CloseAudio();
    for (auto& i : chunkCache)
        Mix_FreeChunk(i.second);
    Mix_CloseAudio();
}


void Sound::play(const std::wstring &name)
{
    if (disabled || (! enableFx))
        return;
    
    Mix_Chunk *chunk = nullptr;
    
    ChunkMap::iterator i = chunkCache.find(name);
    if (i != chunkCache.end())
        chunk = (*i).second;
    else {
        ResDataHolder data(name);
        chunk = Mix_LoadWAV_RW(SDL_RWFromMem(data.getData(), data.getSize()), 
                0);
        chunkCache[name] = chunk;
    }

    if (chunk) {
        Mix_VolumeChunk(chunk, (int)(volume * 128.0f));
        Mix_PlayChannel(-1, chunk, 0);
    }
    SDL_PumpEvents();
}

void Sound::setVolume(float v)
{
    volume = v;
    enableFx = 0.01 < volume;
}