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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2008 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Audio/AudioDevice.hpp>
#include <SFML/Audio/AudioResource.hpp>
#include <SFML/Audio/Listener.hpp>
#include <algorithm>
#include <iostream>
namespace sf
{
namespace priv
{
////////////////////////////////////////////////////////////
// Static member data
////////////////////////////////////////////////////////////
AudioDevice* AudioDevice::ourInstance;
////////////////////////////////////////////////////////////
/// Default constructor
////////////////////////////////////////////////////////////
AudioDevice::AudioDevice() :
myRefCount(0)
{
// Create the device
myDevice = alcOpenDevice(NULL);
if (myDevice)
{
// Create the context
myContext = alcCreateContext(myDevice, NULL);
if (myContext)
{
// Set the context as the current one (we'll only need one)
alcMakeContextCurrent(myContext);
// Initialize the listener, located at the origin and looking along the Z axis
Listener::SetPosition(0.f, 0.f, 0.f);
Listener::SetTarget(0.f, 0.f, -1.f);
}
else
{
std::cerr << "Failed to create the audio context" << std::endl;
}
}
else
{
std::cerr << "Failed to open the audio device" << std::endl;
}
}
////////////////////////////////////////////////////////////
/// Destructor
////////////////////////////////////////////////////////////
AudioDevice::~AudioDevice()
{
// Destroy the context
alcMakeContextCurrent(NULL);
if (myContext)
alcDestroyContext(myContext);
// Destroy the device
if (myDevice)
alcCloseDevice(myDevice);
}
////////////////////////////////////////////////////////////
/// Get the unique instance of the class
////////////////////////////////////////////////////////////
AudioDevice& AudioDevice::GetInstance()
{
// Create the audio device if it doesn't exist
if (!ourInstance)
ourInstance = new AudioDevice;
return *ourInstance;
}
////////////////////////////////////////////////////////////
/// Add a reference to the audio device
////////////////////////////////////////////////////////////
void AudioDevice::AddReference()
{
// Create the audio device if it doesn't exist
if (!ourInstance)
ourInstance = new AudioDevice;
// Increase the references count
ourInstance->myRefCount++;
}
////////////////////////////////////////////////////////////
/// Remove a reference to the audio device
////////////////////////////////////////////////////////////
void AudioDevice::RemoveReference()
{
// Decrease the references count
ourInstance->myRefCount--;
// Destroy the audio device if the references count reaches 0
if (ourInstance->myRefCount == 0)
{
delete ourInstance;
ourInstance = NULL;
}
}
////////////////////////////////////////////////////////////
/// Get the OpenAL audio device
////////////////////////////////////////////////////////////
ALCdevice* AudioDevice::GetDevice() const
{
return myDevice;
}
////////////////////////////////////////////////////////////
/// Get the OpenAL format that matches the given number of channels
////////////////////////////////////////////////////////////
ALenum AudioDevice::GetFormatFromChannelsCount(unsigned int ChannelsCount) const
{
// Find the good format according to the number of channels
switch (ChannelsCount)
{
case 1 : return AL_FORMAT_MONO16;
case 2 : return AL_FORMAT_STEREO16;
case 4 : return alGetEnumValue("AL_FORMAT_QUAD16");
case 6 : return alGetEnumValue("AL_FORMAT_51CHN16");
case 7 : return alGetEnumValue("AL_FORMAT_61CHN16");
case 8 : return alGetEnumValue("AL_FORMAT_71CHN16");
}
return 0;
}
} // namespace priv
} // namespace sf
|
