SFML - Simple and Fast Multimedia Library

00001 
00002 //
00003 // SFML - Simple and Fast Multimedia Library
00004 // Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
00005 //
00006 // This software is provided 'as-is', without any express or implied warranty.
00007 // In no event will the authors be held liable for any damages arising from the use of this software.
00008 //
00009 // Permission is granted to anyone to use this software for any purpose,
00010 // including commercial applications, and to alter it and redistribute it freely,
00011 // subject to the following restrictions:
00012 //
00013 // 1. The origin of this software must not be misrepresented;
00014 //    you must not claim that you wrote the original software.
00015 //    If you use this software in a product, an acknowledgment
00016 //    in the product documentation would be appreciated but is not required.
00017 //
00018 // 2. Altered source versions must be plainly marked as such,
00019 //    and must not be misrepresented as being the original software.
00020 //
00021 // 3. This notice may not be removed or altered from any source distribution.
00022 //
00024 
00026 // Headers
00028 #include <SFML/Audio/AudioDevice.hpp>
00029 #include <SFML/Audio/ALCheck.hpp>
00030 #include <SFML/Audio/Listener.hpp>
00031 #include <SFML/System/Err.hpp>
00032 
00033 
00035 // Private data
00037 namespace 
00038 {
00039     ALCdevice*  audioDevice  = NULL;
00040     ALCcontext* audioContext = NULL;
00041 }
00042 
00043 namespace sf
00044 {
00045 namespace priv
00046 {
00048 AudioDevice::AudioDevice()
00049 {
00050     // Create the device
00051     audioDevice = alcOpenDevice(NULL);
00052 
00053     if (audioDevice)
00054     {
00055         // Create the context
00056         audioContext = alcCreateContext(audioDevice, NULL);
00057 
00058         if (audioContext)
00059         {
00060             // Set the context as the current one (we'll only need one)
00061             alcMakeContextCurrent(audioContext);
00062         }
00063         else
00064         {
00065             Err() << "Failed to create the audio context" << std::endl;
00066         }
00067     }
00068     else
00069     {
00070         Err() << "Failed to open the audio device" << std::endl;
00071     }
00072 }
00073 
00074 
00076 AudioDevice::~AudioDevice()
00077 {
00078     // Destroy the context
00079     alcMakeContextCurrent(NULL);
00080     if (audioContext)
00081         alcDestroyContext(audioContext);
00082     
00083     // Destroy the device
00084     if (audioDevice)
00085         alcCloseDevice(audioDevice);
00086 }
00087 
00088 
00090 bool AudioDevice::IsExtensionSupported(const std::string& extension)
00091 {
00092     EnsureALInit();
00093 
00094     if ((extension.length() > 2) && (extension.substr(0, 3) == "ALC"))
00095         return alcIsExtensionPresent(audioDevice, extension.c_str()) != AL_FALSE;
00096     else
00097         return alIsExtensionPresent(extension.c_str()) != AL_FALSE;
00098 }
00099 
00100 
00102 int AudioDevice::GetFormatFromChannelsCount(unsigned int channelsCount)
00103 {
00104     EnsureALInit();
00105 
00106     // Find the good format according to the number of channels
00107     switch (channelsCount)
00108     {
00109         case 1  : return AL_FORMAT_MONO16;
00110         case 2  : return AL_FORMAT_STEREO16;
00111         case 4  : return alGetEnumValue("AL_FORMAT_QUAD16");
00112         case 6  : return alGetEnumValue("AL_FORMAT_51CHN16");
00113         case 7  : return alGetEnumValue("AL_FORMAT_61CHN16");
00114         case 8  : return alGetEnumValue("AL_FORMAT_71CHN16");
00115         default : return 0;
00116     }
00117 }
00118 
00119 } // namespace priv
00120 
00121 } // namespace sf
AudioDevice.cpp
