AuroraOpenALSoft/OpenAL32/alBuffer.c

/**
 * 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
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <limits.h>

#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
#include "alError.h"
#include "alBuffer.h"
#include "alDatabuffer.h"
#include "alThunk.h"


static ALenum LoadData(ALbuffer *ALBuf, ALuint freq, ALenum NewFormat, ALsizei size, enum SrcFmtChannels chans, enum SrcFmtType type, const ALvoid *data);
static void ConvertData(ALvoid *dst, enum FmtType dstType, const ALvoid *src, enum SrcFmtType srcType, ALsizei len);
static void ConvertDataIMA4(ALvoid *dst, enum FmtType dstType, const ALvoid *src, ALint chans, ALsizei len);

#define LookupBuffer(m, k) ((ALbuffer*)LookupUIntMapKey(&(m), (k)))


/*
 * Global Variables
 */

/* IMA ADPCM Stepsize table */
static const long IMAStep_size[89] = {
       7,    8,    9,   10,   11,   12,   13,   14,   16,   17,   19,
      21,   23,   25,   28,   31,   34,   37,   41,   45,   50,   55,
      60,   66,   73,   80,   88,   97,  107,  118,  130,  143,  157,
     173,  190,  209,  230,  253,  279,  307,  337,  371,  408,  449,
     494,  544,  598,  658,  724,  796,  876,  963, 1060, 1166, 1282,
    1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327, 3660,
    4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493,10442,
   11487,12635,13899,15289,16818,18500,20350,22358,24633,27086,29794,
   32767
};

/* IMA4 ADPCM Codeword decode table */
static const long IMA4Codeword[16] = {
    1, 3, 5, 7, 9, 11, 13, 15,
   -1,-3,-5,-7,-9,-11,-13,-15,
};

/* IMA4 ADPCM Step index adjust decode table */
static const long IMA4Index_adjust[16] = {
   -1,-1,-1,-1, 2, 4, 6, 8,
   -1,-1,-1,-1, 2, 4, 6, 8
};

static const ALshort muLawDecompressionTable[256] = {
    -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
    -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
    -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
    -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
     -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
     -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
     -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
     -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
     -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
     -1372, -1308, -1244, -1180, -1116, -1052,  -988,  -924,
      -876,  -844,  -812,  -780,  -748,  -716,  -684,  -652,
      -620,  -588,  -556,  -524,  -492,  -460,  -428,  -396,
      -372,  -356,  -340,  -324,  -308,  -292,  -276,  -260,
      -244,  -228,  -212,  -196,  -180,  -164,  -148,  -132,
      -120,  -112,  -104,   -96,   -88,   -80,   -72,   -64,
       -56,   -48,   -40,   -32,   -24,   -16,    -8,     0,
     32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
     23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
     15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
     11900, 11388, 10876, 10364,  9852,  9340,  8828,  8316,
      7932,  7676,  7420,  7164,  6908,  6652,  6396,  6140,
      5884,  5628,  5372,  5116,  4860,  4604,  4348,  4092,
      3900,  3772,  3644,  3516,  3388,  3260,  3132,  3004,
      2876,  2748,  2620,  2492,  2364,  2236,  2108,  1980,
      1884,  1820,  1756,  1692,  1628,  1564,  1500,  1436,
      1372,  1308,  1244,  1180,  1116,  1052,   988,   924,
       876,   844,   812,   780,   748,   716,   684,   652,
       620,   588,   556,   524,   492,   460,   428,   396,
       372,   356,   340,   324,   308,   292,   276,   260,
       244,   228,   212,   196,   180,   164,   148,   132,
       120,   112,   104,    96,    88,    80,    72,    64,
        56,    48,    40,    32,    24,    16,     8,     0
};

static const int muLawBias = 0x84;
static const int muLawClip = 32635;

static const char muLawCompressTable[256] =
{
     0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
     4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
     5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
     7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};

/*
 *    alGenBuffers(ALsizei n, ALuint *buffers)
 *
 *    Generates n AL Buffers, and stores the Buffers Names in the array pointed to by buffers
 */
AL_API ALvoid AL_APIENTRY alGenBuffers(ALsizei n, ALuint *buffers)
{
    ALCcontext *Context;
    ALsizei i=0;

    Context = GetContextSuspended();
    if(!Context) return;

    // Check that we are actually generating some Buffers
    if(n < 0 || IsBadWritePtr((void*)buffers, n * sizeof(ALuint)))
        alSetError(Context, AL_INVALID_VALUE);
    else
    {
        ALCdevice *device = Context->Device;
        ALenum err;

        // Create all the new Buffers
        while(i < n)
        {
            ALbuffer *buffer = calloc(1, sizeof(ALbuffer));
            if(!buffer)
            {
                alSetError(Context, AL_OUT_OF_MEMORY);
                alDeleteBuffers(i, buffers);
                break;
            }

            buffer->buffer = (ALuint)ALTHUNK_ADDENTRY(buffer);
            err = InsertUIntMapEntry(&device->BufferMap, buffer->buffer, buffer);
            if(err != AL_NO_ERROR)
            {
                ALTHUNK_REMOVEENTRY(buffer->buffer);
                memset(buffer, 0, sizeof(ALbuffer));
                free(buffer);

                alSetError(Context, err);
                alDeleteBuffers(i, buffers);
                break;
            }
            buffers[i++] = buffer->buffer;
        }
    }

    ProcessContext(Context);
}

/*
 *    alDeleteBuffers(ALsizei n, ALuint *buffers)
 *
 *    Deletes the n AL Buffers pointed to by buffers
 */
AL_API ALvoid AL_APIENTRY alDeleteBuffers(ALsizei n, const ALuint *buffers)
{
    ALCcontext *Context;
    ALCdevice *device;
    ALboolean Failed;
    ALbuffer *ALBuf;
    ALsizei i;

    Context = GetContextSuspended();
    if(!Context) return;

    Failed = AL_TRUE;
    device = Context->Device;
    /* Check we are actually Deleting some Buffers */
    if(n < 0)
        alSetError(Context, AL_INVALID_VALUE);
    else
    {
        Failed = AL_FALSE;

        /* Check that all the buffers are valid and can actually be deleted */
        for(i = 0;i < n;i++)
        {
            if(!buffers[i])
                continue;

            /* Check for valid Buffer ID */
            if((ALBuf=LookupBuffer(device->BufferMap, buffers[i])) == NULL)
            {
                alSetError(Context, AL_INVALID_NAME);
                Failed = AL_TRUE;
                break;
            }
            else if(ALBuf->refcount != 0)
            {
                /* Buffer still in use, cannot be deleted */
                alSetError(Context, AL_INVALID_OPERATION);
                Failed = AL_TRUE;
                break;
            }
        }
    }

    /* If all the Buffers were valid (and have Reference Counts of 0), then we can delete them */
    if(!Failed)
    {
        for(i = 0;i < n;i++)
        {
            if((ALBuf=LookupBuffer(device->BufferMap, buffers[i])) == NULL)
                continue;

            /* Release the memory used to store audio data */
            free(ALBuf->data);

            /* Release buffer structure */
            RemoveUIntMapKey(&device->BufferMap, ALBuf->buffer);
            ALTHUNK_REMOVEENTRY(ALBuf->buffer);

            memset(ALBuf, 0, sizeof(ALbuffer));
            free(ALBuf);
        }
    }

    ProcessContext(Context);
}

/*
 *    alIsBuffer(ALuint buffer)
 *
 *    Checks if buffer is a valid Buffer Name
 */
AL_API ALboolean AL_APIENTRY alIsBuffer(ALuint buffer)
{
    ALCcontext *Context;
    ALboolean  result;

    Context = GetContextSuspended();
    if(!Context) return AL_FALSE;

    result = ((!buffer || LookupBuffer(Context->Device->BufferMap, buffer)) ?
              AL_TRUE : AL_FALSE);

    ProcessContext(Context);

    return result;
}

/*
 *    alBufferData(ALuint buffer,ALenum format,const ALvoid *data,ALsizei size,ALsizei freq)
 *
 *    Fill buffer with audio data
 */
AL_API ALvoid AL_APIENTRY alBufferData(ALuint buffer,ALenum format,const ALvoid *data,ALsizei size,ALsizei freq)
{
    enum SrcFmtChannels SrcChannels;
    enum SrcFmtType SrcType;
    ALCcontext *Context;
    ALCdevice *device;
    ALbuffer *ALBuf;
    ALenum err;

    Context = GetContextSuspended();
    if(!Context) return;

    if(Context->SampleSource)
    {
        ALintptrEXT offset;

        if(Context->SampleSource->state == MAPPED)
        {
            alSetError(Context, AL_INVALID_OPERATION);
            ProcessContext(Context);
            return;
        }

        offset = (const ALubyte*)data - (ALubyte*)NULL;
        data = Context->SampleSource->data + offset;
    }

    device = Context->Device;
    if((ALBuf=LookupBuffer(device->BufferMap, buffer)) == NULL)
        alSetError(Context, AL_INVALID_NAME);
    else if(ALBuf->refcount != 0)
        alSetError(Context, AL_INVALID_VALUE);
    else if(size < 0 || freq < 0)
        alSetError(Context, AL_INVALID_VALUE);
    else if(DecomposeInputFormat(format, &SrcChannels, &SrcType) == AL_FALSE)
        alSetError(Context, AL_INVALID_ENUM);
    else switch(SrcType)
    {
        case SrcFmtByte:
        case SrcFmtUByte:
        case SrcFmtShort:
        case SrcFmtUShort:
        case SrcFmtInt:
        case SrcFmtUInt:
        case SrcFmtFloat:
            err = LoadData(ALBuf, freq, format, size, SrcChannels, SrcType, data);
            if(err != AL_NO_ERROR)
                alSetError(Context, err);
            break;

        case SrcFmtDouble: {
            ALenum NewFormat = AL_FORMAT_MONO_FLOAT32;
            switch(SrcChannels)
            {
                case SrcFmtMono: NewFormat = AL_FORMAT_MONO_FLOAT32; break;
                case SrcFmtStereo: NewFormat = AL_FORMAT_STEREO_FLOAT32; break;
                case SrcFmtRear: NewFormat = AL_FORMAT_REAR32; break;
                case SrcFmtQuad: NewFormat = AL_FORMAT_QUAD32; break;
                case SrcFmtX51: NewFormat = AL_FORMAT_51CHN32; break;
                case SrcFmtX61: NewFormat = AL_FORMAT_61CHN32; break;
                case SrcFmtX71: NewFormat = AL_FORMAT_71CHN32; break;
            }
            err = LoadData(ALBuf, freq, NewFormat, size, SrcChannels, SrcType, data);
            if(err != AL_NO_ERROR)
                alSetError(Context, err);
        }   break;

        case SrcFmtMulaw:
        case SrcFmtIMA4: {
            ALenum NewFormat = AL_FORMAT_MONO16;
            switch(SrcChannels)
            {
                case SrcFmtMono: NewFormat = AL_FORMAT_MONO16; break;
                case SrcFmtStereo: NewFormat = AL_FORMAT_STEREO16; break;
                case SrcFmtRear: NewFormat = AL_FORMAT_REAR16; break;
                case SrcFmtQuad: NewFormat = AL_FORMAT_QUAD16; break;
                case SrcFmtX51: NewFormat = AL_FORMAT_51CHN16; break;
                case SrcFmtX61: NewFormat = AL_FORMAT_61CHN16; break;
                case SrcFmtX71: NewFormat = AL_FORMAT_71CHN16; break;
            }
            err = LoadData(ALBuf, freq, NewFormat, size, SrcChannels, SrcType, data);
            if(err != AL_NO_ERROR)
                alSetError(Context, err);
        }   break;
    }

    ProcessContext(Context);
}

/*
 *    alBufferSubDataSOFT(ALuint buffer,ALenum format,const ALvoid *data,ALsizei offset,ALsizei length)
 *
 *    Update buffer's audio data
 */
AL_API ALvoid AL_APIENTRY alBufferSubDataSOFT(ALuint buffer,ALenum format,const ALvoid *data,ALsizei offset,ALsizei length)
{
    enum SrcFmtChannels SrcChannels;
    enum SrcFmtType SrcType;
    ALCcontext *Context;
    ALCdevice  *device;
    ALbuffer   *ALBuf;

    Context = GetContextSuspended();
    if(!Context) return;

    if(Context->SampleSource)
    {
        ALintptrEXT offset;

        if(Context->SampleSource->state == MAPPED)
        {
            alSetError(Context, AL_INVALID_OPERATION);
            ProcessContext(Context);
            return;
        }

        offset = (const ALubyte*)data - (ALubyte*)NULL;
        data = Context->SampleSource->data + offset;
    }

    device = Context->Device;
    if((ALBuf=LookupBuffer(device->BufferMap, buffer)) == NULL)
        alSetError(Context, AL_INVALID_NAME);
    else if(length < 0 || offset < 0 || (length > 0 && data == NULL))
        alSetError(Context, AL_INVALID_VALUE);
    else if(DecomposeInputFormat(format, &SrcChannels, &SrcType) == AL_FALSE ||
            SrcChannels != ALBuf->OriginalChannels ||
            SrcType != ALBuf->OriginalType)
        alSetError(Context, AL_INVALID_ENUM);
    else if(offset > ALBuf->OriginalSize ||
            length > ALBuf->OriginalSize-offset ||
            (offset%ALBuf->OriginalAlign) != 0 ||
            (length%ALBuf->OriginalAlign) != 0)
        alSetError(Context, AL_INVALID_VALUE);
    else
    {
        if(SrcType == SrcFmtIMA4)
        {
            ALuint Channels = ChannelsFromFmt(ALBuf->FmtChannels);
            ALuint Bytes = BytesFromFmt(ALBuf->FmtType);

            /* offset -> byte offset, length -> block count */
            offset /= 36;
            offset *= 65;
            offset *= Bytes;
            length /= ALBuf->OriginalAlign;

            ConvertDataIMA4(&((ALubyte*)ALBuf->data)[offset], ALBuf->FmtType,
                            data, Channels, length);
        }
        else
        {
            ALuint OldBytes = BytesFromFmt(SrcType);
            ALuint Bytes = BytesFromFmt(ALBuf->FmtType);

            offset /= OldBytes;
            offset *= Bytes;
            length /= OldBytes;

            ConvertData(&((ALubyte*)ALBuf->data)[offset], ALBuf->FmtType,
                        data, SrcType, length);
        }
    }

    ProcessContext(Context);
}

AL_API ALvoid AL_APIENTRY alBufferSubDataEXT(ALuint buffer,ALenum format,const ALvoid *data,ALsizei offset,ALsizei length)
{
    alBufferSubDataSOFT(buffer, format, data, offset, length);
}


AL_API void AL_APIENTRY alBufferf(ALuint buffer, ALenum eParam, ALfloat flValue)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    (void)flValue;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alBuffer3f(ALuint buffer, ALenum eParam, ALfloat flValue1, ALfloat flValue2, ALfloat flValue3)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    (void)flValue1;
    (void)flValue2;
    (void)flValue3;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alBufferfv(ALuint buffer, ALenum eParam, const ALfloat* flValues)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!flValues)
        alSetError(pContext, AL_INVALID_VALUE);
    else if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alBufferi(ALuint buffer, ALenum eParam, ALint lValue)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    (void)lValue;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alBuffer3i( ALuint buffer, ALenum eParam, ALint lValue1, ALint lValue2, ALint lValue3)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    (void)lValue1;
    (void)lValue2;
    (void)lValue3;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alBufferiv(ALuint buffer, ALenum eParam, const ALint* plValues)
{
    ALCcontext    *pContext;
    ALCdevice     *device;
    ALbuffer      *ALBuf;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!plValues)
        alSetError(pContext, AL_INVALID_VALUE);
    else if((ALBuf=LookupBuffer(device->BufferMap, buffer)) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        case AL_LOOP_POINTS:
            if(ALBuf->refcount > 0)
                alSetError(pContext, AL_INVALID_OPERATION);
            else if(plValues[0] < 0 || plValues[1] < 0 ||
                    plValues[0] >= plValues[1] || ALBuf->size == 0)
                alSetError(pContext, AL_INVALID_VALUE);
            else
            {
                ALint maxlen = ALBuf->size /
                               FrameSizeFromFmt(ALBuf->FmtChannels, ALBuf->FmtType);
                if(plValues[0] > maxlen || plValues[1] > maxlen)
                    alSetError(pContext, AL_INVALID_VALUE);
                else
                {
                    ALBuf->LoopStart = plValues[0];
                    ALBuf->LoopEnd = plValues[1];
                }
            }
            break;

        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API ALvoid AL_APIENTRY alGetBufferf(ALuint buffer, ALenum eParam, ALfloat *pflValue)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!pflValue)
        alSetError(pContext, AL_INVALID_VALUE);
    else if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alGetBuffer3f(ALuint buffer, ALenum eParam, ALfloat* pflValue1, ALfloat* pflValue2, ALfloat* pflValue3)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!pflValue1 || !pflValue2 || !pflValue3)
        alSetError(pContext, AL_INVALID_VALUE);
    else if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alGetBufferfv(ALuint buffer, ALenum eParam, ALfloat* pflValues)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!pflValues)
        alSetError(pContext, AL_INVALID_VALUE);
    else if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API ALvoid AL_APIENTRY alGetBufferi(ALuint buffer, ALenum eParam, ALint *plValue)
{
    ALCcontext    *pContext;
    ALbuffer      *pBuffer;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!plValue)
        alSetError(pContext, AL_INVALID_VALUE);
    else if((pBuffer=LookupBuffer(device->BufferMap, buffer)) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        case AL_FREQUENCY:
            *plValue = pBuffer->Frequency;
            break;

        case AL_BITS:
            *plValue = BytesFromFmt(pBuffer->FmtType) * 8;
            break;

        case AL_CHANNELS:
            *plValue = ChannelsFromFmt(pBuffer->FmtChannels);
            break;

        case AL_SIZE:
            *plValue = pBuffer->size;
            break;

        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alGetBuffer3i(ALuint buffer, ALenum eParam, ALint* plValue1, ALint* plValue2, ALint* plValue3)
{
    ALCcontext    *pContext;
    ALCdevice     *device;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!plValue1 || !plValue2 || !plValue3)
        alSetError(pContext, AL_INVALID_VALUE);
    else if(LookupBuffer(device->BufferMap, buffer) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


AL_API void AL_APIENTRY alGetBufferiv(ALuint buffer, ALenum eParam, ALint* plValues)
{
    ALCcontext    *pContext;
    ALCdevice     *device;
    ALbuffer      *ALBuf;

    pContext = GetContextSuspended();
    if(!pContext) return;

    device = pContext->Device;
    if(!plValues)
        alSetError(pContext, AL_INVALID_VALUE);
    else if((ALBuf=LookupBuffer(device->BufferMap, buffer)) == NULL)
        alSetError(pContext, AL_INVALID_NAME);
    else
    {
        switch(eParam)
        {
        case AL_FREQUENCY:
        case AL_BITS:
        case AL_CHANNELS:
        case AL_SIZE:
            alGetBufferi(buffer, eParam, plValues);
            break;

        case AL_LOOP_POINTS:
            plValues[0] = ALBuf->LoopStart;
            plValues[1] = ALBuf->LoopEnd;
            break;

        default:
            alSetError(pContext, AL_INVALID_ENUM);
            break;
        }
    }

    ProcessContext(pContext);
}


typedef ALubyte ALmulaw;

static __inline ALshort DecodeMuLaw(ALmulaw val)
{ return muLawDecompressionTable[val]; }

static ALmulaw EncodeMuLaw(ALshort val)
{
    ALint mant, exp, sign;

    sign = (val>>8) & 0x80;
    if(sign)
    {
        /* -32768 doesn't properly negate on a short; it results in itself.
         * So clamp to -32767 */
        val = max(val, -32767);
        val = -val;
    }

    val = min(val, muLawClip);
    val += muLawBias;

    exp = muLawCompressTable[(val>>7) & 0xff];
    mant = (val >> (exp+3)) & 0x0f;

    return ~(sign | (exp<<4) | mant);
}

static void DecodeIMA4Block(ALshort *dst, const ALubyte *src, ALint numchans)
{
    ALint sample[2], index[2];
    ALuint code[2];
    ALsizei j,k,c;

    for(c = 0;c < numchans;c++)
    {
        sample[c]  = *(src++);
        sample[c] |= *(src++) << 8;
        sample[c]  = (sample[c]^0x8000) - 32768;
        index[c]  = *(src++);
        index[c] |= *(src++) << 8;
        index[c]  = (index[c]^0x8000) - 32768;

        index[c] = max(0, index[c]);
        index[c] = min(index[c], 88);

        dst[c] = sample[c];
    }

    j = 1;
    while(j < 65)
    {
        for(c = 0;c < numchans;c++)
        {
            code[c]  = *(src++);
            code[c] |= *(src++) << 8;
            code[c] |= *(src++) << 16;
            code[c] |= *(src++) << 24;
        }

        for(k = 0;k < 8;k++,j++)
        {
            for(c = 0;c < numchans;c++)
            {
                int nibble = code[c]&0xf;
                code[c] >>= 4;

                sample[c] += IMA4Codeword[nibble] * IMAStep_size[index[c]] / 8;
                sample[c] = max(-32768, sample[c]);
                sample[c] = min(sample[c], 32767);

                index[c] += IMA4Index_adjust[nibble];
                index[c] = max(0, index[c]);
                index[c] = min(index[c], 88);

                dst[j*numchans + c] = sample[c];
            }
        }
    }
}


static __inline ALbyte Conv_ALbyte_ALbyte(ALbyte val)
{ return val; }
static __inline ALbyte Conv_ALbyte_ALubyte(ALubyte val)
{ return val^0x80; }
static __inline ALbyte Conv_ALbyte_ALshort(ALshort val)
{ return val>>8; }
static __inline ALbyte Conv_ALbyte_ALushort(ALushort val)
{ return (val>>8)-128; }
static __inline ALbyte Conv_ALbyte_ALint(ALint val)
{ return val>>24; }
static __inline ALbyte Conv_ALbyte_ALuint(ALuint val)
{ return (val>>24)-128; }
static __inline ALbyte Conv_ALbyte_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 127;
    if(val <= -1.0f) return -128;
    return (ALint)(val * 127.0f);
}
static __inline ALbyte Conv_ALbyte_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 127;
    if(val <= -1.0) return -128;
    return (ALint)(val * 127.0);
}
static __inline ALbyte Conv_ALbyte_ALmulaw(ALmulaw val)
{ return Conv_ALbyte_ALshort(DecodeMuLaw(val)); }

static __inline ALubyte Conv_ALubyte_ALbyte(ALbyte val)
{ return val^0x80; }
static __inline ALubyte Conv_ALubyte_ALubyte(ALubyte val)
{ return val; }
static __inline ALubyte Conv_ALubyte_ALshort(ALshort val)
{ return (val>>8)+128; }
static __inline ALubyte Conv_ALubyte_ALushort(ALushort val)
{ return val>>8; }
static __inline ALubyte Conv_ALubyte_ALint(ALint val)
{ return (val>>24)+128; }
static __inline ALubyte Conv_ALubyte_ALuint(ALuint val)
{ return val>>24; }
static __inline ALubyte Conv_ALubyte_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 255;
    if(val <= -1.0f) return 0;
    return (ALint)(val * 127.0f) + 128;
}
static __inline ALubyte Conv_ALubyte_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 255;
    if(val <= -1.0) return 0;
    return (ALint)(val * 127.0) + 128;
}
static __inline ALubyte Conv_ALubyte_ALmulaw(ALmulaw val)
{ return Conv_ALubyte_ALshort(DecodeMuLaw(val)); }

static __inline ALshort Conv_ALshort_ALbyte(ALbyte val)
{ return val<<8; }
static __inline ALshort Conv_ALshort_ALubyte(ALubyte val)
{ return (val-128)<<8; }
static __inline ALshort Conv_ALshort_ALshort(ALshort val)
{ return val; }
static __inline ALshort Conv_ALshort_ALushort(ALushort val)
{ return val^0x8000; }
static __inline ALshort Conv_ALshort_ALint(ALint val)
{ return val>>16; }
static __inline ALshort Conv_ALshort_ALuint(ALuint val)
{ return (val>>16)-32768; }
static __inline ALshort Conv_ALshort_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 32767;
    if(val <= -1.0f) return -32768;
    return (ALint)(val * 32767.0f);
}
static __inline ALshort Conv_ALshort_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 32767;
    if(val <= -1.0) return -32768;
    return (ALint)(val * 32767.0);
}
static __inline ALshort Conv_ALshort_ALmulaw(ALmulaw val)
{ return Conv_ALshort_ALshort(DecodeMuLaw(val)); }

static __inline ALushort Conv_ALushort_ALbyte(ALbyte val)
{ return (val+128)<<8; }
static __inline ALushort Conv_ALushort_ALubyte(ALubyte val)
{ return val<<8; }
static __inline ALushort Conv_ALushort_ALshort(ALshort val)
{ return val^0x8000; }
static __inline ALushort Conv_ALushort_ALushort(ALushort val)
{ return val; }
static __inline ALushort Conv_ALushort_ALint(ALint val)
{ return (val>>16)+32768; }
static __inline ALushort Conv_ALushort_ALuint(ALuint val)
{ return val>>16; }
static __inline ALushort Conv_ALushort_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 65535;
    if(val <= -1.0f) return 0;
    return (ALint)(val * 32767.0f) + 32768;
}
static __inline ALushort Conv_ALushort_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 65535;
    if(val <= -1.0) return 0;
    return (ALint)(val * 32767.0) + 32768;
}
static __inline ALushort Conv_ALushort_ALmulaw(ALmulaw val)
{ return Conv_ALushort_ALshort(DecodeMuLaw(val)); }

static __inline ALint Conv_ALint_ALbyte(ALbyte val)
{ return val<<24; }
static __inline ALint Conv_ALint_ALubyte(ALubyte val)
{ return (val-128)<<24; }
static __inline ALint Conv_ALint_ALshort(ALshort val)
{ return val<<16; }
static __inline ALint Conv_ALint_ALushort(ALushort val)
{ return (val-32768)<<16; }
static __inline ALint Conv_ALint_ALint(ALint val)
{ return val; }
static __inline ALint Conv_ALint_ALuint(ALuint val)
{ return val-2147483648u; }
static __inline ALint Conv_ALint_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 2147483647;
    if(val <= -1.0f) return -2147483648u;
    return (ALint)(val * 2147483647.0);
}
static __inline ALint Conv_ALint_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 2147483647;
    if(val <= -1.0) return -2147483648u;
    return (ALint)(val * 2147483647.0);
}
static __inline ALint Conv_ALint_ALmulaw(ALmulaw val)
{ return Conv_ALint_ALshort(DecodeMuLaw(val)); }

static __inline ALuint Conv_ALuint_ALbyte(ALbyte val)
{ return (val+128)<<24; }
static __inline ALuint Conv_ALuint_ALubyte(ALubyte val)
{ return val<<24; }
static __inline ALuint Conv_ALuint_ALshort(ALshort val)
{ return (val+32768)<<16; }
static __inline ALuint Conv_ALuint_ALushort(ALushort val)
{ return val<<16; }
static __inline ALuint Conv_ALuint_ALint(ALint val)
{ return val+2147483648u; }
static __inline ALuint Conv_ALuint_ALuint(ALuint val)
{ return val; }
static __inline ALuint Conv_ALuint_ALfloat(ALfloat val)
{
    if(val >= 1.0f) return 4294967295u;
    if(val <= -1.0f) return 0;
    return (ALint)(val * 2147483647.0) + 2147483648u;
}
static __inline ALuint Conv_ALuint_ALdouble(ALdouble val)
{
    if(val >= 1.0) return 4294967295u;
    if(val <= -1.0) return 0;
    return (ALint)(val * 2147483647.0) + 2147483648u;
}
static __inline ALuint Conv_ALuint_ALmulaw(ALmulaw val)
{ return Conv_ALuint_ALshort(DecodeMuLaw(val)); }

static __inline ALfloat Conv_ALfloat_ALbyte(ALbyte val)
{ return val * (1.0f/127.0f); }
static __inline ALfloat Conv_ALfloat_ALubyte(ALubyte val)
{ return (val-128) * (1.0f/127.0f); }
static __inline ALfloat Conv_ALfloat_ALshort(ALshort val)
{ return val * (1.0f/32767.0f); }
static __inline ALfloat Conv_ALfloat_ALushort(ALushort val)
{ return (val-32768) * (1.0f/32767.0f); }
static __inline ALfloat Conv_ALfloat_ALint(ALint val)
{ return val * (1.0/2147483647.0); }
static __inline ALfloat Conv_ALfloat_ALuint(ALuint val)
{ return (ALint)(val-2147483648u) * (1.0/2147483647.0); }
static __inline ALfloat Conv_ALfloat_ALfloat(ALfloat val)
{ return val; }
static __inline ALfloat Conv_ALfloat_ALdouble(ALdouble val)
{ return val; }
static __inline ALfloat Conv_ALfloat_ALmulaw(ALmulaw val)
{ return Conv_ALfloat_ALshort(DecodeMuLaw(val)); }

static __inline ALdouble Conv_ALdouble_ALbyte(ALbyte val)
{ return val * (1.0/127.0); }
static __inline ALdouble Conv_ALdouble_ALubyte(ALubyte val)
{ return (val-128) * (1.0/127.0); }
static __inline ALdouble Conv_ALdouble_ALshort(ALshort val)
{ return val * (1.0/32767.0); }
static __inline ALdouble Conv_ALdouble_ALushort(ALushort val)
{ return (val-32768) * (1.0/32767.0); }
static __inline ALdouble Conv_ALdouble_ALint(ALint val)
{ return val * (1.0/2147483647.0); }
static __inline ALdouble Conv_ALdouble_ALuint(ALuint val)
{ return (ALint)(val-2147483648u) * (1.0/2147483647.0); }
static __inline ALdouble Conv_ALdouble_ALfloat(ALfloat val)
{ return val; }
static __inline ALdouble Conv_ALdouble_ALdouble(ALdouble val)
{ return val; }
static __inline ALdouble Conv_ALdouble_ALmulaw(ALmulaw val)
{ return Conv_ALdouble_ALshort(DecodeMuLaw(val)); }

#define DECL_TEMPLATE(T)                                                      \
static __inline ALmulaw Conv_ALmulaw_##T(T val)                               \
{ return EncodeMuLaw(Conv_ALshort_##T(val)); }

DECL_TEMPLATE(ALbyte)
DECL_TEMPLATE(ALubyte)
DECL_TEMPLATE(ALshort)
DECL_TEMPLATE(ALushort)
DECL_TEMPLATE(ALint)
DECL_TEMPLATE(ALuint)
DECL_TEMPLATE(ALfloat)
DECL_TEMPLATE(ALdouble)
DECL_TEMPLATE(ALmulaw)

#undef DECL_TEMPLATE

#define DECL_TEMPLATE(T1, T2)                                                 \
static void Convert_##T1##_##T2(T1 *dst, const T2 *src, ALuint len)           \
{                                                                             \
    ALuint i;                                                                 \
    for(i = 0;i < len;i++)                                                    \
        *(dst++) = Conv_##T1##_##T2(*(src++));                                \
}

DECL_TEMPLATE(ALbyte, ALbyte)
DECL_TEMPLATE(ALbyte, ALubyte)
DECL_TEMPLATE(ALbyte, ALshort)
DECL_TEMPLATE(ALbyte, ALushort)
DECL_TEMPLATE(ALbyte, ALint)
DECL_TEMPLATE(ALbyte, ALuint)
DECL_TEMPLATE(ALbyte, ALfloat)
DECL_TEMPLATE(ALbyte, ALdouble)
DECL_TEMPLATE(ALbyte, ALmulaw)

DECL_TEMPLATE(ALubyte, ALbyte)
DECL_TEMPLATE(ALubyte, ALubyte)
DECL_TEMPLATE(ALubyte, ALshort)
DECL_TEMPLATE(ALubyte, ALushort)
DECL_TEMPLATE(ALubyte, ALint)
DECL_TEMPLATE(ALubyte, ALuint)
DECL_TEMPLATE(ALubyte, ALfloat)
DECL_TEMPLATE(ALubyte, ALdouble)
DECL_TEMPLATE(ALubyte, ALmulaw)

DECL_TEMPLATE(ALshort, ALbyte)
DECL_TEMPLATE(ALshort, ALubyte)
DECL_TEMPLATE(ALshort, ALshort)
DECL_TEMPLATE(ALshort, ALushort)
DECL_TEMPLATE(ALshort, ALint)
DECL_TEMPLATE(ALshort, ALuint)
DECL_TEMPLATE(ALshort, ALfloat)
DECL_TEMPLATE(ALshort, ALdouble)
DECL_TEMPLATE(ALshort, ALmulaw)

DECL_TEMPLATE(ALushort, ALbyte)
DECL_TEMPLATE(ALushort, ALubyte)
DECL_TEMPLATE(ALushort, ALshort)
DECL_TEMPLATE(ALushort, ALushort)
DECL_TEMPLATE(ALushort, ALint)
DECL_TEMPLATE(ALushort, ALuint)
DECL_TEMPLATE(ALushort, ALfloat)
DECL_TEMPLATE(ALushort, ALdouble)
DECL_TEMPLATE(ALushort, ALmulaw)

DECL_TEMPLATE(ALint, ALbyte)
DECL_TEMPLATE(ALint, ALubyte)
DECL_TEMPLATE(ALint, ALshort)
DECL_TEMPLATE(ALint, ALushort)
DECL_TEMPLATE(ALint, ALint)
DECL_TEMPLATE(ALint, ALuint)
DECL_TEMPLATE(ALint, ALfloat)
DECL_TEMPLATE(ALint, ALdouble)
DECL_TEMPLATE(ALint, ALmulaw)

DECL_TEMPLATE(ALuint, ALbyte)
DECL_TEMPLATE(ALuint, ALubyte)
DECL_TEMPLATE(ALuint, ALshort)
DECL_TEMPLATE(ALuint, ALushort)
DECL_TEMPLATE(ALuint, ALint)
DECL_TEMPLATE(ALuint, ALuint)
DECL_TEMPLATE(ALuint, ALfloat)
DECL_TEMPLATE(ALuint, ALdouble)
DECL_TEMPLATE(ALuint, ALmulaw)

DECL_TEMPLATE(ALfloat, ALbyte)
DECL_TEMPLATE(ALfloat, ALubyte)
DECL_TEMPLATE(ALfloat, ALshort)
DECL_TEMPLATE(ALfloat, ALushort)
DECL_TEMPLATE(ALfloat, ALint)
DECL_TEMPLATE(ALfloat, ALuint)
DECL_TEMPLATE(ALfloat, ALfloat)
DECL_TEMPLATE(ALfloat, ALdouble)
DECL_TEMPLATE(ALfloat, ALmulaw)

DECL_TEMPLATE(ALdouble, ALbyte)
DECL_TEMPLATE(ALdouble, ALubyte)
DECL_TEMPLATE(ALdouble, ALshort)
DECL_TEMPLATE(ALdouble, ALushort)
DECL_TEMPLATE(ALdouble, ALint)
DECL_TEMPLATE(ALdouble, ALuint)
DECL_TEMPLATE(ALdouble, ALfloat)
DECL_TEMPLATE(ALdouble, ALdouble)
DECL_TEMPLATE(ALdouble, ALmulaw)

DECL_TEMPLATE(ALmulaw, ALbyte)
DECL_TEMPLATE(ALmulaw, ALubyte)
DECL_TEMPLATE(ALmulaw, ALshort)
DECL_TEMPLATE(ALmulaw, ALushort)
DECL_TEMPLATE(ALmulaw, ALint)
DECL_TEMPLATE(ALmulaw, ALuint)
DECL_TEMPLATE(ALmulaw, ALfloat)
DECL_TEMPLATE(ALmulaw, ALdouble)
DECL_TEMPLATE(ALmulaw, ALmulaw)

#undef DECL_TEMPLATE

#define DECL_TEMPLATE(T)                                                      \
static void Convert_##T##_IMA4(T *dst, const ALubyte *src, ALuint numchans,   \
                               ALuint numblocks)                              \
{                                                                             \
    ALshort tmp[65*2]; /* Max samples an IMA4 frame can be */                 \
    ALuint i, j;                                                              \
    for(i = 0;i < numblocks;i++)                                              \
    {                                                                         \
        DecodeIMA4Block(tmp, src, numchans);                                  \
        src += 36*numchans;                                                   \
        for(j = 0;j < 65*numchans;j++)                                        \
            *(dst++) = Conv_##T##_ALshort(tmp[j]);                            \
    }                                                                         \
}

DECL_TEMPLATE(ALbyte)
DECL_TEMPLATE(ALubyte)
DECL_TEMPLATE(ALshort)
DECL_TEMPLATE(ALushort)
DECL_TEMPLATE(ALint)
DECL_TEMPLATE(ALuint)
DECL_TEMPLATE(ALfloat)
DECL_TEMPLATE(ALdouble)
DECL_TEMPLATE(ALmulaw)

#undef DECL_TEMPLATE

#define DECL_TEMPLATE(T)                                                      \
static void Convert_##T(T *dst, const ALvoid *src, enum SrcFmtType srcType,   \
                        ALsizei len)                                          \
{                                                                             \
    switch(srcType)                                                           \
    {                                                                         \
        case SrcFmtByte:                                                      \
            Convert_##T##_ALbyte(dst, src, len);                              \
            break;                                                            \
        case SrcFmtUByte:                                                     \
            Convert_##T##_ALubyte(dst, src, len);                             \
            break;                                                            \
        case SrcFmtShort:                                                     \
            Convert_##T##_ALshort(dst, src, len);                             \
            break;                                                            \
        case SrcFmtUShort:                                                    \
            Convert_##T##_ALushort(dst, src, len);                            \
            break;                                                            \
        case SrcFmtInt:                                                       \
            Convert_##T##_ALint(dst, src, len);                               \
            break;                                                            \
        case SrcFmtUInt:                                                      \
            Convert_##T##_ALuint(dst, src, len);                              \
            break;                                                            \
        case SrcFmtFloat:                                                     \
            Convert_##T##_ALfloat(dst, src, len);                             \
            break;                                                            \
        case SrcFmtDouble:                                                    \
            Convert_##T##_ALdouble(dst, src, len);                            \
            break;                                                            \
        case SrcFmtMulaw:                                                     \
            Convert_##T##_ALmulaw(dst, src, len);                             \
            break;                                                            \
        case SrcFmtIMA4:                                                      \
            break; /* not handled here */                                     \
    }                                                                         \
}

DECL_TEMPLATE(ALbyte)
DECL_TEMPLATE(ALubyte)
DECL_TEMPLATE(ALshort)
DECL_TEMPLATE(ALushort)
DECL_TEMPLATE(ALint)
DECL_TEMPLATE(ALuint)
DECL_TEMPLATE(ALfloat)
DECL_TEMPLATE(ALdouble)
DECL_TEMPLATE(ALmulaw)

#undef DECL_TEMPLATE


static void ConvertData(ALvoid *dst, enum FmtType dstType, const ALvoid *src, enum SrcFmtType srcType, ALsizei len)
{
    switch(dstType)
    {
        (void)Convert_ALbyte;
        case FmtUByte:
            Convert_ALubyte(dst, src, srcType, len);
            break;
        case FmtShort:
            Convert_ALshort(dst, src, srcType, len);
            break;
        (void)Convert_ALushort;
        (void)Convert_ALint;
        (void)Convert_ALuint;
        case FmtFloat:
            Convert_ALfloat(dst, src, srcType, len);
            break;
        (void)Convert_ALdouble;
        (void)Convert_ALmulaw;
    }
}

static void ConvertDataIMA4(ALvoid *dst, enum FmtType dstType, const ALvoid *src, ALint chans, ALsizei len)
{
    switch(dstType)
    {
        (void)Convert_ALbyte_IMA4;
        case FmtUByte:
            Convert_ALubyte_IMA4(dst, src, chans, len);
            break;
        case FmtShort:
            Convert_ALshort_IMA4(dst, src, chans, len);
            break;
        (void)Convert_ALushort_IMA4;
        (void)Convert_ALint_IMA4;
        (void)Convert_ALuint_IMA4;
        case FmtFloat:
            Convert_ALfloat_IMA4(dst, src, chans, len);
            break;
        (void)Convert_ALdouble_IMA4;
        (void)Convert_ALmulaw_IMA4;
    }
}


/*
 * LoadData
 *
 * Loads the specified data into the buffer, using the specified formats.
 * Currently, the new format must have the same channel configuration as the
 * original format.
 */
static ALenum LoadData(ALbuffer *ALBuf, ALuint freq, ALenum NewFormat, ALsizei size, enum SrcFmtChannels SrcChannels, enum SrcFmtType SrcType, const ALvoid *data)
{
    ALuint NewChannels, NewBytes;
    enum FmtChannels DstChannels;
    enum FmtType DstType;
    ALuint64 newsize;
    ALvoid *temp;

    DecomposeFormat(NewFormat, &DstChannels, &DstType);
    NewChannels = ChannelsFromFmt(DstChannels);
    NewBytes = BytesFromFmt(DstType);

    assert(SrcChannels == DstChannels);

    if(SrcType == SrcFmtIMA4)
    {
        ALuint OrigChannels = ChannelsFromSrcFmt(SrcChannels);

        /* Here is where things vary:
         * nVidia and Apple use 64+1 sample frames per block => block_size=36*chans bytes
         * Most PC sound software uses 2040+1 sample frames per block -> block_size=1024*chans bytes
         */
        if((size%(36*OrigChannels)) != 0)
            return AL_INVALID_VALUE;

        newsize = size / 36;
        newsize *= 65;
        newsize *= NewBytes;
        if(newsize > INT_MAX)
            return AL_OUT_OF_MEMORY;

        temp = realloc(ALBuf->data, newsize);
        if(!temp && newsize) return AL_OUT_OF_MEMORY;
        ALBuf->data = temp;
        ALBuf->size = newsize;

        if(data != NULL)
            ConvertDataIMA4(ALBuf->data, DstType, data, OrigChannels,
                            newsize/(65*NewChannels*NewBytes));

        ALBuf->OriginalChannels = SrcChannels;
        ALBuf->OriginalType     = SrcType;
        ALBuf->OriginalSize     = size;
        ALBuf->OriginalAlign    = 36 * OrigChannels;
    }
    else
    {
        ALuint OrigBytes = BytesFromSrcFmt(SrcType);
        ALuint OrigChannels = ChannelsFromSrcFmt(SrcChannels);

        if((size%(OrigBytes*OrigChannels)) != 0)
            return AL_INVALID_VALUE;

        newsize = size / OrigBytes;
        newsize *= NewBytes;
        if(newsize > INT_MAX)
            return AL_OUT_OF_MEMORY;

        temp = realloc(ALBuf->data, newsize);
        if(!temp && newsize) return AL_OUT_OF_MEMORY;
        ALBuf->data = temp;
        ALBuf->size = newsize;

        if(data != NULL)
            ConvertData(ALBuf->data, DstType, data, SrcType, newsize/NewBytes);

        ALBuf->OriginalChannels = SrcChannels;
        ALBuf->OriginalType     = SrcType;
        ALBuf->OriginalSize     = size;
        ALBuf->OriginalAlign    = OrigBytes * OrigChannels;
    }

    ALBuf->Frequency = freq;
    ALBuf->FmtChannels = DstChannels;
    ALBuf->FmtType = DstType;

    ALBuf->LoopStart = 0;
    ALBuf->LoopEnd = newsize / NewChannels / NewBytes;

    return AL_NO_ERROR;
}


ALuint BytesFromSrcFmt(enum SrcFmtType type)
{
    switch(type)
    {
    case SrcFmtByte: return sizeof(ALbyte);
    case SrcFmtUByte: return sizeof(ALubyte);
    case SrcFmtShort: return sizeof(ALshort);
    case SrcFmtUShort: return sizeof(ALushort);
    case SrcFmtInt: return sizeof(ALint);
    case SrcFmtUInt: return sizeof(ALuint);
    case SrcFmtFloat: return sizeof(ALfloat);
    case SrcFmtDouble: return sizeof(ALdouble);
    case SrcFmtMulaw: return sizeof(ALubyte);
    case SrcFmtIMA4: break; /* not handled here */
    }
    return 0;
}
ALuint ChannelsFromSrcFmt(enum SrcFmtChannels chans)
{
    switch(chans)
    {
    case SrcFmtMono: return 1;
    case SrcFmtStereo: return 2;
    case SrcFmtRear: return 2;
    case SrcFmtQuad: return 4;
    case SrcFmtX51: return 6;
    case SrcFmtX61: return 7;
    case SrcFmtX71: return 8;
    }
    return 0;
}
ALboolean DecomposeInputFormat(ALenum format, enum SrcFmtChannels *chans,
                               enum SrcFmtType *type)
{
    switch(format)
    {
        case AL_FORMAT_MONO8:
            *chans = SrcFmtMono;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_MONO16:
            *chans = SrcFmtMono;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_MONO_FLOAT32:
            *chans = SrcFmtMono;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_MONO_DOUBLE_EXT:
            *chans = SrcFmtMono;
            *type  = SrcFmtDouble;
            return AL_TRUE;
        case AL_FORMAT_MONO_IMA4:
            *chans = SrcFmtMono;
            *type  = SrcFmtIMA4;
            return AL_TRUE;
        case AL_FORMAT_STEREO8:
            *chans = SrcFmtStereo;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_STEREO16:
            *chans = SrcFmtStereo;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_STEREO_FLOAT32:
            *chans = SrcFmtStereo;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_STEREO_DOUBLE_EXT:
            *chans = SrcFmtStereo;
            *type  = SrcFmtDouble;
            return AL_TRUE;
        case AL_FORMAT_STEREO_IMA4:
            *chans = SrcFmtStereo;
            *type  = SrcFmtIMA4;
            return AL_TRUE;
        case AL_FORMAT_QUAD8_LOKI:
        case AL_FORMAT_QUAD8:
            *chans = SrcFmtQuad;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_QUAD16_LOKI:
        case AL_FORMAT_QUAD16:
            *chans = SrcFmtQuad;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_QUAD32:
            *chans = SrcFmtQuad;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_REAR8:
            *chans = SrcFmtRear;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_REAR16:
            *chans = SrcFmtRear;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_REAR32:
            *chans = SrcFmtRear;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_51CHN8:
            *chans = SrcFmtX51;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_51CHN16:
            *chans = SrcFmtX51;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_51CHN32:
            *chans = SrcFmtX51;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_61CHN8:
            *chans = SrcFmtX61;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_61CHN16:
            *chans = SrcFmtX61;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_61CHN32:
            *chans = SrcFmtX61;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_71CHN8:
            *chans = SrcFmtX71;
            *type  = SrcFmtUByte;
            return AL_TRUE;
        case AL_FORMAT_71CHN16:
            *chans = SrcFmtX71;
            *type  = SrcFmtShort;
            return AL_TRUE;
        case AL_FORMAT_71CHN32:
            *chans = SrcFmtX71;
            *type  = SrcFmtFloat;
            return AL_TRUE;
        case AL_FORMAT_MONO_MULAW:
            *chans = SrcFmtMono;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_STEREO_MULAW:
            *chans = SrcFmtStereo;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_QUAD_MULAW:
            *chans = SrcFmtQuad;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_REAR_MULAW:
            *chans = SrcFmtRear;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_51CHN_MULAW:
            *chans = SrcFmtX51;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_61CHN_MULAW:
            *chans = SrcFmtX61;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
        case AL_FORMAT_71CHN_MULAW:
            *chans = SrcFmtX71;
            *type  = SrcFmtMulaw;
            return AL_TRUE;
    }
    return AL_FALSE;
}

ALuint BytesFromFmt(enum FmtType type)
{
    switch(type)
    {
    case FmtUByte: return sizeof(ALubyte);
    case FmtShort: return sizeof(ALshort);
    case FmtFloat: return sizeof(ALfloat);
    }
    return 0;
}
ALuint ChannelsFromFmt(enum FmtChannels chans)
{
    switch(chans)
    {
    case FmtMono: return 1;
    case FmtStereo: return 2;
    case FmtRear: return 2;
    case FmtQuad: return 4;
    case FmtX51: return 6;
    case FmtX61: return 7;
    case FmtX71: return 8;
    }
    return 0;
}
ALboolean DecomposeFormat(ALenum format, enum FmtChannels *chans, enum FmtType *type)
{
    switch(format)
    {
        case AL_FORMAT_MONO8:
            *chans = FmtMono;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_MONO16:
            *chans = FmtMono;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_MONO_FLOAT32:
            *chans = FmtMono;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_STEREO8:
            *chans = FmtStereo;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_STEREO16:
            *chans = FmtStereo;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_STEREO_FLOAT32:
            *chans = FmtStereo;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_QUAD8_LOKI:
        case AL_FORMAT_QUAD8:
            *chans = FmtQuad;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_QUAD16_LOKI:
        case AL_FORMAT_QUAD16:
            *chans = FmtQuad;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_QUAD32:
            *chans = FmtQuad;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_REAR8:
            *chans = FmtRear;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_REAR16:
            *chans = FmtRear;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_REAR32:
            *chans = FmtRear;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_51CHN8:
            *chans = FmtX51;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_51CHN16:
            *chans = FmtX51;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_51CHN32:
            *chans = FmtX51;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_61CHN8:
            *chans = FmtX61;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_61CHN16:
            *chans = FmtX61;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_61CHN32:
            *chans = FmtX61;
            *type  = FmtFloat;
            return AL_TRUE;
        case AL_FORMAT_71CHN8:
            *chans = FmtX71;
            *type  = FmtUByte;
            return AL_TRUE;
        case AL_FORMAT_71CHN16:
            *chans = FmtX71;
            *type  = FmtShort;
            return AL_TRUE;
        case AL_FORMAT_71CHN32:
            *chans = FmtX71;
            *type  = FmtFloat;
            return AL_TRUE;
    }
    return AL_FALSE;
}


/*
 *    ReleaseALBuffers()
 *
 *    INTERNAL FN : Called by alcCloseDevice to destroy any buffers that still exist
 */
ALvoid ReleaseALBuffers(ALCdevice *device)
{
    ALsizei i;
    for(i = 0;i < device->BufferMap.size;i++)
    {
        ALbuffer *temp = device->BufferMap.array[i].value;
        device->BufferMap.array[i].value = NULL;

        // Release sample data
        free(temp->data);

        // Release Buffer structure
        ALTHUNK_REMOVEENTRY(temp->buffer);
        memset(temp, 0, sizeof(ALbuffer));
        free(temp);
    }
}