Initial import

1 files changed, 1117 insertions, 0 deletions

diff --git a/Alc/ALc.c b/Alc/ALc.c
new file mode 100644
index 00000000..2adcbb8e
--- /dev/null
+++ b/Alc/ALc.c
@@ -0,0 +1,1117 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2007 by authors.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#define _CRT_SECURE_NO_DEPRECATE // get rid of sprintf security warnings on VS2005
+
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <memory.h>
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+
+///////////////////////////////////////////////////////
+// DEBUG INFORMATION
+
+#ifdef _DEBUG
+ char szDebug[256];
+#endif
+
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// FUNCTION PROTOTYPES
+
+void fill_device_list();
+
+void alc_alsa_init(BackendFuncs *func_list);
+void alc_oss_init(BackendFuncs *func_list);
+void alcDSoundInit(BackendFuncs *func_list);
+void alcWinMMInit(BackendFuncs *FuncList);
+
+#define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
+struct {
+    const char *name;
+    void (*Init)(BackendFuncs*);
+    BackendFuncs Funcs;
+} BackendList[] = {
+#ifdef HAVE_ALSA
+    { "alsa", alc_alsa_init, EmptyFuncs },
+#endif
+#ifdef HAVE_OSS
+    { "oss", alc_oss_init, EmptyFuncs },
+#endif
+#ifdef HAVE_DSOUND
+    { "dsound", alcDSoundInit, EmptyFuncs },
+#endif
+#ifdef HAVE_WINMM
+    { "winmm", alcWinMMInit, EmptyFuncs },
+#endif
+
+    { NULL, NULL, EmptyFuncs }
+};
+#undef EmptyFuncs
+
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// STRING and EXTENSIONS
+
+typedef struct ALCextension_struct
+{
+    ALCchar        *extName;
+    ALvoid        *address;
+} ALCextension;
+
+typedef struct ALCfunction_struct
+{
+    ALCchar        *funcName;
+    ALvoid        *address;
+} ALCfunction;
+
+static ALCextension alcExtensions[] = {
+    { "ALC_ENUMERATE_ALL_EXT", (ALvoid *) NULL },
+    { "ALC_ENUMERATION_EXT",   (ALvoid *) NULL },
+    { "ALC_EXT_CAPTURE",       (ALvoid *) NULL },
+    { NULL,                    (ALvoid *) NULL }
+};
+
+static ALCfunction  alcFunctions[] = {
+    { "alcCreateContext",           (ALvoid *) alcCreateContext         },
+    { "alcMakeContextCurrent",      (ALvoid *) alcMakeContextCurrent    },
+    { "alcProcessContext",          (ALvoid *) alcProcessContext        },
+    { "alcSuspendContext",          (ALvoid *) alcSuspendContext        },
+    { "alcDestroyContext",          (ALvoid *) alcDestroyContext        },
+    { "alcGetCurrentContext",       (ALvoid *) alcGetCurrentContext     },
+    { "alcGetContextsDevice",       (ALvoid *) alcGetContextsDevice     },
+    { "alcOpenDevice",              (ALvoid *) alcOpenDevice            },
+    { "alcCloseDevice",             (ALvoid *) alcCloseDevice           },
+    { "alcGetError",                (ALvoid *) alcGetError              },
+    { "alcIsExtensionPresent",      (ALvoid *) alcIsExtensionPresent    },
+    { "alcGetProcAddress",          (ALvoid *) alcGetProcAddress        },
+    { "alcGetEnumValue",            (ALvoid *) alcGetEnumValue          },
+    { "alcGetString",               (ALvoid *) alcGetString             },
+    { "alcGetIntegerv",             (ALvoid *) alcGetIntegerv           },
+    { "alcCaptureOpenDevice",       (ALvoid *) alcCaptureOpenDevice     },
+    { "alcCaptureCloseDevice",      (ALvoid *) alcCaptureCloseDevice    },
+    { "alcCaptureStart",            (ALvoid *) alcCaptureStart          },
+    { "alcCaptureStop",             (ALvoid *) alcCaptureStop           },
+    { "alcCaptureSamples",          (ALvoid *) alcCaptureSamples        },
+    { NULL,                         (ALvoid *) NULL                     }
+};
+
+static ALenums enumeration[]={
+    // Types
+    { (ALchar *)"ALC_INVALID",                          ALC_INVALID                         },
+    { (ALchar *)"ALC_FALSE",                            ALC_FALSE                           },
+    { (ALchar *)"ALC_TRUE",                             ALC_TRUE                            },
+
+    // ALC Properties
+    { (ALchar *)"ALC_MAJOR_VERSION",                    ALC_MAJOR_VERSION                   },
+    { (ALchar *)"ALC_MINOR_VERSION",                    ALC_MINOR_VERSION                   },
+    { (ALchar *)"ALC_ATTRIBUTES_SIZE",                  ALC_ATTRIBUTES_SIZE                 },
+    { (ALchar *)"ALC_ALL_ATTRIBUTES",                   ALC_ALL_ATTRIBUTES                  },
+    { (ALchar *)"ALC_DEFAULT_DEVICE_SPECIFIER",         ALC_DEFAULT_DEVICE_SPECIFIER        },
+    { (ALchar *)"ALC_DEVICE_SPECIFIER",                 ALC_DEVICE_SPECIFIER                },
+    { (ALchar *)"ALC_ALL_DEVICES_SPECIFIER",            ALC_ALL_DEVICES_SPECIFIER           },
+    { (ALchar *)"ALC_DEFAULT_ALL_DEVICES_SPECIFIER",    ALC_DEFAULT_ALL_DEVICES_SPECIFIER   },
+    { (ALchar *)"ALC_EXTENSIONS",                       ALC_EXTENSIONS                      },
+    { (ALchar *)"ALC_FREQUENCY",                        ALC_FREQUENCY                       },
+    { (ALchar *)"ALC_REFRESH",                          ALC_REFRESH                         },
+    { (ALchar *)"ALC_SYNC",                             ALC_SYNC                            },
+    { (ALchar *)"ALC_MONO_SOURCES",                     ALC_MONO_SOURCES                    },
+    { (ALchar *)"ALC_STEREO_SOURCES",                   ALC_STEREO_SOURCES                  },
+    { (ALchar *)"ALC_CAPTURE_DEVICE_SPECIFIER",         ALC_CAPTURE_DEVICE_SPECIFIER        },
+    { (ALchar *)"ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER", ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER },
+    { (ALchar *)"ALC_CAPTURE_SAMPLES",                  ALC_CAPTURE_SAMPLES                 },
+
+    // ALC Error Message
+    { (ALchar *)"ALC_NO_ERROR",                         ALC_NO_ERROR                        },
+    { (ALchar *)"ALC_INVALID_DEVICE",                   ALC_INVALID_DEVICE                  },
+    { (ALchar *)"ALC_INVALID_CONTEXT",                  ALC_INVALID_CONTEXT                 },
+    { (ALchar *)"ALC_INVALID_ENUM",                     ALC_INVALID_ENUM                    },
+    { (ALchar *)"ALC_INVALID_VALUE",                    ALC_INVALID_VALUE                   },
+    { (ALchar *)"ALC_OUT_OF_MEMORY",                    ALC_OUT_OF_MEMORY                   },
+    { (ALchar *)NULL,                                   (ALenum)0 }
+};
+// Error strings
+static const ALCchar alcNoError[] = "No Error";
+static const ALCchar alcErrInvalidDevice[] = "Invalid Device";
+static const ALCchar alcErrInvalidContext[] = "Invalid Context";
+static const ALCchar alcErrInvalidEnum[] = "Invalid Enum";
+static const ALCchar alcErrInvalidValue[] = "Invalid Value";
+static const ALCchar alcErrOutOfMemory[] = "Out of Memory";
+
+// Context strings
+static ALCchar alcDeviceList[2048];
+static ALCchar alcAllDeviceList[2048];
+static ALCchar alcCaptureDeviceList[2048];
+// Default is always the first in the list
+static ALCchar *alcDefaultDeviceSpecifier = alcDeviceList;
+static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
+static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
+
+
+static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE";
+static ALCint alcMajorVersion = 1;
+static ALCint alcMinorVersion = 1;
+
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// Global Variables
+
+// Critical Section data
+extern CRITICAL_SECTION g_mutex;
+
+// Context List
+static ALCcontext *g_pContextList = NULL;
+static ALCuint     g_ulContextCount = 0;
+
+// Context Error
+static ALCenum g_eLastContextError = ALC_NO_ERROR;
+
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// ALC Related helper functions
+
+ALCchar *AppendDeviceList(char *name)
+{
+    static int pos;
+    ALCchar *ret = alcDeviceList+pos;
+    pos += snprintf(alcDeviceList+pos, sizeof(alcDeviceList)-pos, "%s", name) + 1;
+    return ret;
+}
+
+ALCchar *AppendAllDeviceList(char *name)
+{
+    static int pos;
+    ALCchar *ret = alcAllDeviceList+pos;
+    pos += snprintf(alcAllDeviceList+pos, sizeof(alcAllDeviceList)-pos, "%s", name) + 1;
+    return ret;
+}
+
+ALCchar *AppendCaptureDeviceList(char *name)
+{
+    static int pos;
+    ALCchar *ret = alcCaptureDeviceList+pos;
+    pos += snprintf(alcCaptureDeviceList+pos, sizeof(alcCaptureDeviceList)-pos, "%s", name) + 1;
+    return ret;
+}
+
+/*
+    IsContext
+
+    Check pContext is a valid Context pointer
+*/
+ALCboolean IsContext(ALCcontext *pContext)
+{
+    ALCcontext *pTempContext;
+
+    pTempContext = g_pContextList;
+    while (pTempContext && pTempContext != pContext)
+        pTempContext = pTempContext->next;
+
+    return (pTempContext ? ALC_TRUE : ALC_FALSE);
+}
+
+
+/*
+    SetALCError
+
+    Store latest ALC Error
+*/
+ALCvoid SetALCError(ALenum errorCode)
+{
+    g_eLastContextError = errorCode;
+}
+
+
+/*
+    SuspendContext
+
+    Thread-safe entry
+*/
+ALCvoid SuspendContext(ALCcontext *pContext)
+{
+    (void)pContext;
+    EnterCriticalSection(&g_mutex);
+}
+
+
+/*
+    ProcessContext
+
+    Thread-safe exit
+*/
+ALCvoid ProcessContext(ALCcontext *pContext)
+{
+    (void)pContext;
+    LeaveCriticalSection(&g_mutex);
+}
+
+
+/*
+    InitContext
+
+    Initialize Context variables
+*/
+static ALvoid InitContext(ALCcontext *pContext)
+{
+    //Initialise listener
+    pContext->Listener.Gain = 1.0f;
+    pContext->Listener.Position[0] = 0.0f;
+    pContext->Listener.Position[1] = 0.0f;
+    pContext->Listener.Position[2] = 0.0f;
+    pContext->Listener.Velocity[0] = 0.0f;
+    pContext->Listener.Velocity[1] = 0.0f;
+    pContext->Listener.Velocity[2] = 0.0f;
+    pContext->Listener.Forward[0] = 0.0f;
+    pContext->Listener.Forward[1] = 0.0f;
+    pContext->Listener.Forward[2] = -1.0f;
+    pContext->Listener.Up[0] = 0.0f;
+    pContext->Listener.Up[1] = 1.0f;
+    pContext->Listener.Up[2] = 0.0f;
+
+    //Validate pContext
+    pContext->LastError = AL_NO_ERROR;
+    pContext->InUse = AL_FALSE;
+
+    //Set output format
+    pContext->Frequency = pContext->Device->Frequency;
+
+    //Set globals
+    pContext->DistanceModel = AL_INVERSE_DISTANCE_CLAMPED;
+    pContext->DopplerFactor = 1.0f;
+    pContext->DopplerVelocity = 1.0f;
+    pContext->flSpeedOfSound = SPEEDOFSOUNDMETRESPERSEC;
+
+    pContext->lNumStereoSources = 1;
+    pContext->lNumMonoSources = pContext->Device->MaxNoOfSources - pContext->lNumStereoSources;
+
+    strcpy(pContext->ExtensionList, "AL_EXT_EXPONENT_DISTANCE AL_EXT_LINEAR_DISTANCE AL_EXT_OFFSET");
+}
+
+
+/*
+    ExitContext
+
+    Clean up Context, destroy any remaining Sources
+*/
+static ALCvoid ExitContext(ALCcontext *pContext)
+{
+    unsigned int i;
+    ALsource *ALSource;
+    ALsource *ALTempSource;
+
+#ifdef _DEBUG
+    if (pContext->SourceCount>0)
+    {
+        sprintf(szDebug,"OpenAL32 : alcDestroyContext() %d Source(s) NOT deleted\n", pContext->SourceCount);
+        OutputDebugString(szDebug);
+    }
+#endif
+
+    // Free all the Sources still remaining
+    ALSource = pContext->Source;
+    for (i = 0; i < pContext->SourceCount; i++)
+    {
+        ALTempSource = ALSource->next;
+        ALTHUNK_REMOVEENTRY(ALSource->source);
+        memset(ALSource, 0, sizeof(ALsource));
+        free(ALSource);
+        ALSource = ALTempSource;
+    }
+
+    //Invalidate context
+    pContext->LastError = AL_NO_ERROR;
+    pContext->InUse = AL_FALSE;
+}
+
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// ALC Functions calls
+
+
+// This should probably move to another c file but for now ...
+ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
+{
+    ALCboolean DeviceFound = ALC_FALSE;
+    ALCdevice *pDevice = NULL;
+    ALCint i;
+
+    fill_device_list();
+
+    pDevice = malloc(sizeof(ALCdevice));
+    if (pDevice)
+    {
+        if (SampleSize > 0)
+        {
+            //Initialise device structure
+            memset(pDevice, 0, sizeof(ALCdevice));
+
+            //Validate device
+            pDevice->InUse = AL_TRUE;
+            pDevice->IsCaptureDevice = AL_TRUE;
+
+            pDevice->Frequency = frequency;
+            pDevice->Format = format;
+            pDevice->Channels = aluChannelsFromFormat(format);
+            pDevice->FrameSize = aluBytesFromFormat(format) *
+                                 pDevice->Channels;
+
+            for(i = 0;BackendList[i].Init;i++)
+            {
+                pDevice->Funcs = &BackendList[i].Funcs;
+                if(ALCdevice_OpenCapture(pDevice, deviceName, frequency, format, SampleSize))
+                {
+                    DeviceFound = ALC_TRUE;
+                    break;
+                }
+            }
+        }
+        else
+            SetALCError(ALC_INVALID_VALUE);
+
+        if(!DeviceFound)
+        {
+            free(pDevice);
+            pDevice = NULL;
+        }
+    }
+    else
+        SetALCError(ALC_OUT_OF_MEMORY);
+
+    return pDevice;
+}
+
+ALCAPI ALCboolean ALCAPIENTRY alcCaptureCloseDevice(ALCdevice *pDevice)
+{
+    ALCboolean bReturn = ALC_FALSE;
+
+    if ((pDevice)&&(pDevice->IsCaptureDevice))
+    {
+        ALCdevice_CloseCapture(pDevice);
+        free(pDevice);
+
+        bReturn = ALC_TRUE;
+    }
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+
+    return bReturn;
+}
+
+ALCAPI void ALCAPIENTRY alcCaptureStart(ALCdevice *pDevice)
+{
+    if ((pDevice)&&(pDevice->IsCaptureDevice))
+        ALCdevice_StartCapture(pDevice);
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+}
+
+ALCAPI void ALCAPIENTRY alcCaptureStop(ALCdevice *pDevice)
+{
+    if ((pDevice)&&(pDevice->IsCaptureDevice))
+        ALCdevice_StopCapture(pDevice);
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+}
+
+ALCAPI void ALCAPIENTRY alcCaptureSamples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCsizei lSamples)
+{
+    if ((pDevice) && (pDevice->IsCaptureDevice))
+        ALCdevice_CaptureSamples(pDevice, pBuffer, lSamples);
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+}
+
+/*
+    alcGetError
+
+    Return last ALC generated error code
+*/
+ALCAPI ALCenum ALCAPIENTRY alcGetError(ALCdevice *device)
+{
+    ALCenum errorCode;
+
+    (void)device;
+
+    errorCode = g_eLastContextError;
+    g_eLastContextError = ALC_NO_ERROR;
+    return errorCode;
+}
+
+
+/*
+    alcSuspendContext
+
+    Not functional
+*/
+ALCAPI ALCvoid ALCAPIENTRY alcSuspendContext(ALCcontext *pContext)
+{
+    // Not a lot happens here !
+    (void)pContext;
+}
+
+
+/*
+    alcProcessContext
+
+    Not functional
+*/
+ALCAPI ALCvoid ALCAPIENTRY alcProcessContext(ALCcontext *pContext)
+{
+    // Not a lot happens here !
+    (void)pContext;
+}
+
+
+/*
+    alcGetString
+
+    Returns information about the Device, and error strings
+*/
+ALCAPI const ALCchar* ALCAPIENTRY alcGetString(ALCdevice *pDevice,ALCenum param)
+{
+    const ALCchar *value = NULL;
+
+    fill_device_list();
+
+    switch (param)
+    {
+    case ALC_NO_ERROR:
+        value = alcNoError;
+        break;
+
+    case ALC_INVALID_ENUM:
+        value = alcErrInvalidEnum;
+        break;
+
+    case ALC_INVALID_VALUE:
+        value = alcErrInvalidValue;
+        break;
+
+    case ALC_INVALID_DEVICE:
+        value = alcErrInvalidDevice;
+        break;
+
+    case ALC_INVALID_CONTEXT:
+        value = alcErrInvalidContext;
+        break;
+
+    case ALC_OUT_OF_MEMORY:
+        value = alcErrOutOfMemory;
+        break;
+
+    case ALC_DEFAULT_DEVICE_SPECIFIER:
+        value = alcDefaultDeviceSpecifier;
+        break;
+
+    case ALC_DEVICE_SPECIFIER:
+        if (pDevice)
+            value = pDevice->szDeviceName;
+        else
+            value = alcDeviceList;
+        break;
+
+    case ALC_ALL_DEVICES_SPECIFIER:
+        value = alcAllDeviceList;
+        break;
+
+    case ALC_DEFAULT_ALL_DEVICES_SPECIFIER:
+        value = alcDefaultAllDeviceSpecifier;
+        break;
+
+    case ALC_CAPTURE_DEVICE_SPECIFIER:
+        if (pDevice)
+            value = pDevice->szDeviceName;
+        else
+            value = alcCaptureDeviceList;
+        break;
+
+    case ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER:
+        value = alcCaptureDefaultDeviceSpecifier;
+        break;
+
+    case ALC_EXTENSIONS:
+        value = alcExtensionList;
+        break;
+
+    default:
+        SetALCError(ALC_INVALID_ENUM);
+        break;
+    }
+
+    return value;
+}
+
+
+/*
+    alcGetIntegerv
+
+    Returns information about the Device and the version of Open AL
+*/
+ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsizei size,ALCint *data)
+{
+    fill_device_list();
+
+    if ((device)&&(device->IsCaptureDevice))
+    {
+        SuspendContext(NULL);
+
+        // Capture device
+        switch (param)
+        {
+        case ALC_CAPTURE_SAMPLES:
+            if ((size) && (data))
+                *data = ALCdevice_AvailableSamples(device);
+            else
+                SetALCError(ALC_INVALID_VALUE);
+            break;
+
+        default:
+            SetALCError(ALC_INVALID_ENUM);
+            break;
+        }
+
+        ProcessContext(NULL);
+    }
+    else
+    {
+        if(data)
+        {
+            // Playback Device
+            switch (param)
+            {
+                case ALC_MAJOR_VERSION:
+                    if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = alcMajorVersion;
+                    break;
+
+                case ALC_MINOR_VERSION:
+                    if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = alcMinorVersion;
+                    break;
+
+                case ALC_ATTRIBUTES_SIZE:
+                    if(!device)
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = 11;
+                    break;
+
+                case ALC_ALL_ATTRIBUTES:
+                    if(!device)
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if (size < 7)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                    {
+                        int i = 0;
+
+                        data[i++] = ALC_FREQUENCY;
+                        data[i++] = device->Frequency;
+
+                        data[i++] = ALC_REFRESH;
+                        data[i++] = device->UpdateFreq;
+
+                        data[i++] = ALC_SYNC;
+                        data[i++] = ALC_FALSE;
+
+                        SuspendContext(NULL);
+                        if(device->Context && size >= 11)
+                        {
+                            data[i++] = ALC_MONO_SOURCES;
+                            data[i++] = device->Context->lNumMonoSources;
+
+                            data[i++] = ALC_STEREO_SOURCES;
+                            data[i++] = device->Context->lNumStereoSources;
+                        }
+                        ProcessContext(NULL);
+
+                        data[i++] = 0;
+                    }
+                    break;
+
+                case ALC_FREQUENCY:
+                    if(!device)
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = device->Frequency;
+                    break;
+
+                case ALC_REFRESH:
+                    if(!device)
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = device->UpdateFreq;
+                    break;
+
+                case ALC_SYNC:
+                    if(!device)
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if(!size)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = ALC_FALSE;
+                    break;
+
+                default:
+                    SetALCError(ALC_INVALID_ENUM);
+                    break;
+            }
+        }
+        else if(size)
+            SetALCError(ALC_INVALID_VALUE);
+    }
+
+    return;
+}
+
+
+/*
+    alcIsExtensionPresent
+
+    Determines if there is support for a particular extension
+*/
+ALCAPI ALCboolean ALCAPIENTRY alcIsExtensionPresent(ALCdevice *device, const ALCchar *extName)
+{
+    ALCboolean bResult = ALC_FALSE;
+    ALsizei i = 0;
+
+    (void)device;
+
+    if (extName)
+    {
+        while(alcExtensions[i].extName &&
+              strcasecmp(alcExtensions[i].extName,extName) != 0)
+            i++;
+
+        if (alcExtensions[i].extName)
+            bResult = ALC_TRUE;
+    }
+    else
+        SetALCError(ALC_INVALID_VALUE);
+
+    return bResult;
+}
+
+
+/*
+    alcGetProcAddress
+
+    Retrieves the function address for a particular extension function
+*/
+ALCAPI ALCvoid *  ALCAPIENTRY alcGetProcAddress(ALCdevice *device, const ALCchar *funcName)
+{
+    ALCvoid *pFunction = NULL;
+    ALsizei i = 0;
+
+    (void)device;
+
+    if (funcName)
+    {
+        while(alcFunctions[i].funcName &&
+              strcmp(alcFunctions[i].funcName,funcName) != 0)
+            i++;
+        pFunction = alcFunctions[i].address;
+    }
+    else
+        SetALCError(ALC_INVALID_VALUE);
+
+    return pFunction;
+}
+
+
+/*
+    alcGetEnumValue
+
+    Get the value for a particular ALC Enumerated Value
+*/
+ALCAPI ALCenum ALCAPIENTRY alcGetEnumValue(ALCdevice *device, const ALCchar *enumName)
+{
+    ALsizei i = 0;
+    ALCenum val;
+
+    (void)device;
+
+    while ((enumeration[i].enumName)&&(strcmp(enumeration[i].enumName,enumName)))
+        i++;
+    val = enumeration[i].value;
+
+    if(!enumeration[i].enumName)
+        SetALCError(ALC_INVALID_VALUE);
+
+    return val;
+}
+
+
+/*
+    alcCreateContext
+
+    Create and attach a Context to a particular Device.
+*/
+ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint *attrList)
+{
+    ALCcontext *ALContext = NULL;
+    ALuint      ulAttributeIndex, ulRequestedStereoSources;
+
+    if ((device)&&(!device->IsCaptureDevice))
+    {
+        // Reset Context Last Error code
+        g_eLastContextError = ALC_NO_ERROR;
+
+        // Current implementation only allows one Context per Device
+        if(!device->Context)
+        {
+            ALContext = calloc(1, sizeof(ALCcontext));
+            if(!ALContext)
+            {
+                SetALCError(ALC_OUT_OF_MEMORY);
+                return NULL;
+            }
+
+            ALContext->Device = device;
+            InitContext(ALContext);
+
+            device->Context = ALContext;
+
+            SuspendContext(NULL);
+
+            ALContext->next = g_pContextList;
+            g_pContextList = ALContext;
+            g_ulContextCount++;
+
+            ProcessContext(NULL);
+
+            // Check for Voice Count attributes
+            if (attrList)
+            {
+                ulAttributeIndex = 0;
+                while ((ulAttributeIndex < 10) && (attrList[ulAttributeIndex]))
+                {
+                    if (attrList[ulAttributeIndex] == ALC_STEREO_SOURCES)
+                    {
+                        ulRequestedStereoSources = attrList[ulAttributeIndex + 1];
+
+                        if (ulRequestedStereoSources > ALContext->Device->MaxNoOfSources)
+                            ulRequestedStereoSources = ALContext->Device->MaxNoOfSources;
+
+                        ALContext->lNumStereoSources = ulRequestedStereoSources;
+                        ALContext->lNumMonoSources = ALContext->Device->MaxNoOfSources - ALContext->lNumStereoSources;
+                        break;
+                    }
+
+                    ulAttributeIndex += 2;
+                }
+            }
+        }
+        else
+        {
+            SetALCError(ALC_INVALID_VALUE);
+            ALContext = NULL;
+        }
+    }
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+
+    return ALContext;
+}
+
+
+/*
+    alcDestroyContext
+
+    Remove a Context
+*/
+ALCAPI ALCvoid ALCAPIENTRY alcDestroyContext(ALCcontext *context)
+{
+    ALCcontext **list;
+
+    // Lock context list
+    SuspendContext(NULL);
+
+    if (IsContext(context))
+    {
+        // Lock context
+        SuspendContext(context);
+
+        context->Device->Context = NULL;
+
+        list = &g_pContextList;
+        while(*list != context)
+            list = &(*list)->next;
+
+        *list = (*list)->next;
+        g_ulContextCount--;
+
+        // Unlock context
+        ProcessContext(context);
+
+        ExitContext(context);
+
+        // Free memory (MUST do this after ProcessContext)
+        memset(context, 0, sizeof(ALCcontext));
+        free(context);
+    }
+    else
+        SetALCError(ALC_INVALID_CONTEXT);
+
+    ProcessContext(NULL);
+}
+
+
+/*
+    alcGetCurrentContext
+
+    Returns the currently active Context
+*/
+ALCAPI ALCcontext * ALCAPIENTRY alcGetCurrentContext(ALCvoid)
+{
+    ALCcontext *pContext = NULL;
+
+    SuspendContext(NULL);
+
+    pContext = g_pContextList;
+    while ((pContext) && (!pContext->InUse))
+        pContext = pContext->next;
+
+    ProcessContext(NULL);
+
+    return pContext;
+}
+
+
+/*
+    alcGetContextsDevice
+
+    Returns the Device that a particular Context is attached to
+*/
+ALCAPI ALCdevice* ALCAPIENTRY alcGetContextsDevice(ALCcontext *pContext)
+{
+    ALCdevice *pDevice = NULL;
+
+    SuspendContext(NULL);
+    if (IsContext(pContext))
+        pDevice = pContext->Device;
+    else
+        SetALCError(ALC_INVALID_CONTEXT);
+    ProcessContext(NULL);
+
+    return pDevice;
+}
+
+
+/*
+    alcMakeContextCurrent
+
+    Makes the given Context the active Context
+*/
+ALCAPI ALCboolean ALCAPIENTRY alcMakeContextCurrent(ALCcontext *context)
+{
+    ALCcontext *ALContext;
+    ALboolean bReturn = AL_TRUE;
+
+    SuspendContext(NULL);
+
+    // context must be a valid Context or NULL
+    if ((IsContext(context)) || (context == NULL))
+    {
+        if ((ALContext=alcGetCurrentContext()))
+        {
+            SuspendContext(ALContext);
+            ALContext->InUse=AL_FALSE;
+            ProcessContext(ALContext);
+        }
+
+        if ((ALContext=context) && (ALContext->Device))
+        {
+            SuspendContext(ALContext);
+            ALContext->InUse=AL_TRUE;
+            ProcessContext(ALContext);
+        }
+    }
+    else
+    {
+        SetALCError(ALC_INVALID_CONTEXT);
+        bReturn = AL_FALSE;
+    }
+
+    ProcessContext(NULL);
+
+    return bReturn;
+}
+
+
+/*
+    alcOpenDevice
+
+    Open the Device specified.
+*/
+ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
+{
+    ALboolean bDeviceFound = AL_FALSE;
+    ALCdevice *device;
+    ALint i;
+
+    fill_device_list();
+
+    device = malloc(sizeof(ALCdevice));
+    if (device)
+    {
+        const char *fmt;
+
+        //Initialise device structure
+        memset(device, 0, sizeof(ALCdevice));
+
+        //Validate device
+        device->InUse = AL_TRUE;
+        device->IsCaptureDevice = AL_FALSE;
+
+        //Set output format
+        device->Frequency = GetConfigValueInt(NULL, "frequency", SWMIXER_OUTPUT_RATE);
+        if((ALint)device->Frequency <= 0)
+            device->Frequency = SWMIXER_OUTPUT_RATE;
+
+        fmt = GetConfigValue(NULL, "format", "AL_FORMAT_STEREO16");
+        if(fmt[0])
+            device->Format = alGetEnumValue(fmt);
+        switch(device->Format)
+        {
+            case AL_FORMAT_MONO8:
+                device->Channels = 1;
+                device->FrameSize = 1;
+                break;
+            case AL_FORMAT_STEREO8:
+                device->Channels = 2;
+                device->FrameSize = 2;
+                break;
+            case AL_FORMAT_QUAD8:
+                device->Channels = 4;
+                device->FrameSize = 4;
+                break;
+            case AL_FORMAT_MONO16:
+                device->Channels = 1;
+                device->FrameSize = 2;
+                break;
+            case AL_FORMAT_STEREO16:
+                device->Channels = 2;
+                device->FrameSize = 4;
+                break;
+            case AL_FORMAT_QUAD16:
+                device->Channels = 4;
+                device->FrameSize = 8;
+                break;
+            default:
+                device->Format = AL_FORMAT_STEREO16;
+                device->Channels = 2;
+                device->FrameSize = 4;
+                break;
+        }
+
+        device->UpdateFreq = GetConfigValueInt(NULL, "refresh", 0);
+        if((ALint)device->UpdateFreq <= 0)
+            device->UpdateFreq = 8192 * device->Frequency / 22050;
+
+        // Find a playback device to open
+        for(i = 0;BackendList[i].Init;i++)
+        {
+            device->Funcs = &BackendList[i].Funcs;
+            if(ALCdevice_OpenPlayback(device, deviceName))
+            {
+                bDeviceFound = AL_TRUE;
+                break;
+            }
+        }
+
+        if (!bDeviceFound)
+        {
+            // No suitable output device found
+            free(device);
+            device = NULL;
+        }
+    }
+
+    return device;
+}
+
+
+/*
+    alcCloseDevice
+
+    Close the specified Device
+*/
+ALCAPI ALCboolean ALCAPIENTRY alcCloseDevice(ALCdevice *pDevice)
+{
+    ALCboolean bReturn = ALC_FALSE;
+
+    if ((pDevice)&&(!pDevice->IsCaptureDevice))
+    {
+        ALCdevice_ClosePlayback(pDevice);
+
+        //Release device structure
+        memset(pDevice, 0, sizeof(ALCdevice));
+        free(pDevice);
+
+        bReturn = ALC_TRUE;
+    }
+    else
+        SetALCError(ALC_INVALID_DEVICE);
+
+    return bReturn;
+}
+///////////////////////////////////////////////////////
+
+
+///////////////////////////////////////////////////////
+// ALC Device Specific Functions
+
+void fill_device_list()
+{
+    static int done = 0;
+    if(!done)
+    {
+        int i;
+        for(i = 0;BackendList[i].Init;i++)
+            BackendList[i].Init(&BackendList[i].Funcs);
+        done = 1;
+    }
+}