/**
 * 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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include <ctype.h>
#include <signal.h>

#include "alMain.h"
#include "alSource.h"
#include "alListener.h"
#include "alThunk.h"
#include "alSource.h"
#include "alBuffer.h"
#include "alAuxEffectSlot.h"
#include "alError.h"
#include "alMidi.h"
#include "bs2b.h"
#include "alu.h"

#include "compat.h"
#include "threads.h"
#include "alstring.h"

#include "backends/base.h"
#include "midi/base.h"


/************************************************
 * Backends
 ************************************************/
struct BackendInfo {
    const char *name;
    ALCbackendFactory* (*getFactory)(void);
    ALCboolean (*Init)(BackendFuncs*);
    void (*Deinit)(void);
    void (*Probe)(enum DevProbe);
    BackendFuncs Funcs;
};

#define EmptyFuncs { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
static struct BackendInfo BackendList[] = {
#ifdef HAVE_PULSEAUDIO
    { "pulse", ALCpulseBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif
#ifdef HAVE_ALSA
    { "alsa", ALCalsaBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif
#ifdef HAVE_COREAUDIO
    { "core", NULL, alc_ca_init, alc_ca_deinit, alc_ca_probe, EmptyFuncs },
#endif
#ifdef HAVE_OSS
    { "oss", ALCossBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif
#ifdef HAVE_SOLARIS
    { "solaris", NULL, alc_solaris_init, alc_solaris_deinit, alc_solaris_probe, EmptyFuncs },
#endif
#ifdef HAVE_SNDIO
    { "sndio", NULL, alc_sndio_init, alc_sndio_deinit, alc_sndio_probe, EmptyFuncs },
#endif
#ifdef HAVE_QSA
    { "qsa", NULL, alc_qsa_init, alc_qsa_deinit, alc_qsa_probe, EmptyFuncs },
#endif
#ifdef HAVE_MMDEVAPI
    { "mmdevapi", ALCmmdevBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif
#ifdef HAVE_DSOUND
    { "dsound", ALCdsoundBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif
#ifdef HAVE_WINMM
    { "winmm", NULL, alcWinMMInit, alcWinMMDeinit, alcWinMMProbe, EmptyFuncs },
#endif
#ifdef HAVE_PORTAUDIO
    { "port", NULL, alc_pa_init, alc_pa_deinit, alc_pa_probe, EmptyFuncs },
#endif
#ifdef HAVE_OPENSL
    { "opensl", NULL, alc_opensl_init, alc_opensl_deinit, alc_opensl_probe, EmptyFuncs },
#endif

    { "null", ALCnullBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#ifdef HAVE_WAVE
    { "wave", ALCwaveBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
#endif

    { NULL, NULL, NULL, NULL, NULL, EmptyFuncs }
};
#undef EmptyFuncs

static struct BackendInfo PlaybackBackend;
static struct BackendInfo CaptureBackend;

static bool SuspendAndProcessSupported = false;


/************************************************
 * Functions, enums, and errors
 ************************************************/
typedef struct ALCfunction {
    const ALCchar *funcName;
    ALCvoid *address;
} ALCfunction;

typedef struct ALCenums {
    const ALCchar *enumName;
    ALCenum value;
} ALCenums;

#define DECL(x) { #x, (ALCvoid*)(x) }
static const ALCfunction alcFunctions[] = {
    DECL(alcCreateContext),
    DECL(alcMakeContextCurrent),
    DECL(alcProcessContext),
    DECL(alcSuspendContext),
    DECL(alcDestroyContext),
    DECL(alcGetCurrentContext),
    DECL(alcGetContextsDevice),
    DECL(alcOpenDevice),
    DECL(alcCloseDevice),
    DECL(alcGetError),
    DECL(alcIsExtensionPresent),
    DECL(alcGetProcAddress),
    DECL(alcGetEnumValue),
    DECL(alcGetString),
    DECL(alcGetIntegerv),
    DECL(alcCaptureOpenDevice),
    DECL(alcCaptureCloseDevice),
    DECL(alcCaptureStart),
    DECL(alcCaptureStop),
    DECL(alcCaptureSamples),

    DECL(alcSetThreadContext),
    DECL(alcGetThreadContext),

    DECL(alcLoopbackOpenDeviceSOFT),
    DECL(alcIsRenderFormatSupportedSOFT),
    DECL(alcRenderSamplesSOFT),

    DECL(alcDevicePauseSOFT),
    DECL(alcDeviceResumeSOFT),

    DECL(alcGetInteger64vSOFT),

    DECL(alEnable),
    DECL(alDisable),
    DECL(alIsEnabled),
    DECL(alGetString),
    DECL(alGetBooleanv),
    DECL(alGetIntegerv),
    DECL(alGetFloatv),
    DECL(alGetDoublev),
    DECL(alGetBoolean),
    DECL(alGetInteger),
    DECL(alGetFloat),
    DECL(alGetDouble),
    DECL(alGetError),
    DECL(alIsExtensionPresent),
    DECL(alGetProcAddress),
    DECL(alGetEnumValue),
    DECL(alListenerf),
    DECL(alListener3f),
    DECL(alListenerfv),
    DECL(alListeneri),
    DECL(alListener3i),
    DECL(alListeneriv),
    DECL(alGetListenerf),
    DECL(alGetListener3f),
    DECL(alGetListenerfv),
    DECL(alGetListeneri),
    DECL(alGetListener3i),
    DECL(alGetListeneriv),
    DECL(alGenSources),
    DECL(alDeleteSources),
    DECL(alIsSource),
    DECL(alSourcef),
    DECL(alSource3f),
    DECL(alSourcefv),
    DECL(alSourcei),
    DECL(alSource3i),
    DECL(alSourceiv),
    DECL(alGetSourcef),
    DECL(alGetSource3f),
    DECL(alGetSourcefv),
    DECL(alGetSourcei),
    DECL(alGetSource3i),
    DECL(alGetSourceiv),
    DECL(alSourcePlayv),
    DECL(alSourceStopv),
    DECL(alSourceRewindv),
    DECL(alSourcePausev),
    DECL(alSourcePlay),
    DECL(alSourceStop),
    DECL(alSourceRewind),
    DECL(alSourcePause),
    DECL(alSourceQueueBuffers),
    DECL(alSourceUnqueueBuffers),
    DECL(alGenBuffers),
    DECL(alDeleteBuffers),
    DECL(alIsBuffer),
    DECL(alBufferData),
    DECL(alBufferf),
    DECL(alBuffer3f),
    DECL(alBufferfv),
    DECL(alBufferi),
    DECL(alBuffer3i),
    DECL(alBufferiv),
    DECL(alGetBufferf),
    DECL(alGetBuffer3f),
    DECL(alGetBufferfv),
    DECL(alGetBufferi),
    DECL(alGetBuffer3i),
    DECL(alGetBufferiv),
    DECL(alDopplerFactor),
    DECL(alDopplerVelocity),
    DECL(alSpeedOfSound),
    DECL(alDistanceModel),

    DECL(alGenFilters),
    DECL(alDeleteFilters),
    DECL(alIsFilter),
    DECL(alFilteri),
    DECL(alFilteriv),
    DECL(alFilterf),
    DECL(alFilterfv),
    DECL(alGetFilteri),
    DECL(alGetFilteriv),
    DECL(alGetFilterf),
    DECL(alGetFilterfv),
    DECL(alGenEffects),
    DECL(alDeleteEffects),
    DECL(alIsEffect),
    DECL(alEffecti),
    DECL(alEffectiv),
    DECL(alEffectf),
    DECL(alEffectfv),
    DECL(alGetEffecti),
    DECL(alGetEffectiv),
    DECL(alGetEffectf),
    DECL(alGetEffectfv),
    DECL(alGenAuxiliaryEffectSlots),
    DECL(alDeleteAuxiliaryEffectSlots),
    DECL(alIsAuxiliaryEffectSlot),
    DECL(alAuxiliaryEffectSloti),
    DECL(alAuxiliaryEffectSlotiv),
    DECL(alAuxiliaryEffectSlotf),
    DECL(alAuxiliaryEffectSlotfv),
    DECL(alGetAuxiliaryEffectSloti),
    DECL(alGetAuxiliaryEffectSlotiv),
    DECL(alGetAuxiliaryEffectSlotf),
    DECL(alGetAuxiliaryEffectSlotfv),

    DECL(alBufferSubDataSOFT),

    DECL(alBufferSamplesSOFT),
    DECL(alBufferSubSamplesSOFT),
    DECL(alGetBufferSamplesSOFT),
    DECL(alIsBufferFormatSupportedSOFT),

    DECL(alDeferUpdatesSOFT),
    DECL(alProcessUpdatesSOFT),

    DECL(alSourcedSOFT),
    DECL(alSource3dSOFT),
    DECL(alSourcedvSOFT),
    DECL(alGetSourcedSOFT),
    DECL(alGetSource3dSOFT),
    DECL(alGetSourcedvSOFT),
    DECL(alSourcei64SOFT),
    DECL(alSource3i64SOFT),
    DECL(alSourcei64vSOFT),
    DECL(alGetSourcei64SOFT),
    DECL(alGetSource3i64SOFT),
    DECL(alGetSourcei64vSOFT),

    DECL(alGenSoundfontsSOFT),
    DECL(alDeleteSoundfontsSOFT),
    DECL(alIsSoundfontSOFT),
    DECL(alGetSoundfontivSOFT),
    DECL(alSoundfontPresetsSOFT),
    DECL(alGenPresetsSOFT),
    DECL(alDeletePresetsSOFT),
    DECL(alIsPresetSOFT),
    DECL(alPresetiSOFT),
    DECL(alPresetivSOFT),
    DECL(alGetPresetivSOFT),
    DECL(alPresetFontsoundsSOFT),
    DECL(alGenFontsoundsSOFT),
    DECL(alDeleteFontsoundsSOFT),
    DECL(alIsFontsoundSOFT),
    DECL(alFontsoundiSOFT),
    DECL(alFontsound2iSOFT),
    DECL(alFontsoundivSOFT),
    DECL(alGetFontsoundivSOFT),
    DECL(alFontsoundModulatoriSOFT),
    DECL(alGetFontsoundModulatorivSOFT),
    DECL(alMidiSoundfontSOFT),
    DECL(alMidiSoundfontvSOFT),
    DECL(alMidiEventSOFT),
    DECL(alMidiSysExSOFT),
    DECL(alMidiPlaySOFT),
    DECL(alMidiPauseSOFT),
    DECL(alMidiStopSOFT),
    DECL(alMidiResetSOFT),
    DECL(alMidiGainSOFT),
    DECL(alGetInteger64SOFT),
    DECL(alGetInteger64vSOFT),
    DECL(alLoadSoundfontSOFT),

    { NULL, NULL }
};
#undef DECL

#define DECL(x) { #x, (x) }
static const ALCenums enumeration[] = {
    DECL(ALC_INVALID),
    DECL(ALC_FALSE),
    DECL(ALC_TRUE),

    DECL(ALC_MAJOR_VERSION),
    DECL(ALC_MINOR_VERSION),
    DECL(ALC_ATTRIBUTES_SIZE),
    DECL(ALC_ALL_ATTRIBUTES),
    DECL(ALC_DEFAULT_DEVICE_SPECIFIER),
    DECL(ALC_DEVICE_SPECIFIER),
    DECL(ALC_ALL_DEVICES_SPECIFIER),
    DECL(ALC_DEFAULT_ALL_DEVICES_SPECIFIER),
    DECL(ALC_EXTENSIONS),
    DECL(ALC_FREQUENCY),
    DECL(ALC_REFRESH),
    DECL(ALC_SYNC),
    DECL(ALC_MONO_SOURCES),
    DECL(ALC_STEREO_SOURCES),
    DECL(ALC_CAPTURE_DEVICE_SPECIFIER),
    DECL(ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER),
    DECL(ALC_CAPTURE_SAMPLES),
    DECL(ALC_CONNECTED),

    DECL(ALC_EFX_MAJOR_VERSION),
    DECL(ALC_EFX_MINOR_VERSION),
    DECL(ALC_MAX_AUXILIARY_SENDS),

    DECL(ALC_FORMAT_CHANNELS_SOFT),
    DECL(ALC_FORMAT_TYPE_SOFT),

    DECL(ALC_MONO_SOFT),
    DECL(ALC_STEREO_SOFT),
    DECL(ALC_QUAD_SOFT),
    DECL(ALC_5POINT1_SOFT),
    DECL(ALC_6POINT1_SOFT),
    DECL(ALC_7POINT1_SOFT),

    DECL(ALC_BYTE_SOFT),
    DECL(ALC_UNSIGNED_BYTE_SOFT),
    DECL(ALC_SHORT_SOFT),
    DECL(ALC_UNSIGNED_SHORT_SOFT),
    DECL(ALC_INT_SOFT),
    DECL(ALC_UNSIGNED_INT_SOFT),
    DECL(ALC_FLOAT_SOFT),

    DECL(ALC_NO_ERROR),
    DECL(ALC_INVALID_DEVICE),
    DECL(ALC_INVALID_CONTEXT),
    DECL(ALC_INVALID_ENUM),
    DECL(ALC_INVALID_VALUE),
    DECL(ALC_OUT_OF_MEMORY),


    DECL(AL_INVALID),
    DECL(AL_NONE),
    DECL(AL_FALSE),
    DECL(AL_TRUE),

    DECL(AL_SOURCE_RELATIVE),
    DECL(AL_CONE_INNER_ANGLE),
    DECL(AL_CONE_OUTER_ANGLE),
    DECL(AL_PITCH),
    DECL(AL_POSITION),
    DECL(AL_DIRECTION),
    DECL(AL_VELOCITY),
    DECL(AL_LOOPING),
    DECL(AL_BUFFER),
    DECL(AL_GAIN),
    DECL(AL_MIN_GAIN),
    DECL(AL_MAX_GAIN),
    DECL(AL_ORIENTATION),
    DECL(AL_REFERENCE_DISTANCE),
    DECL(AL_ROLLOFF_FACTOR),
    DECL(AL_CONE_OUTER_GAIN),
    DECL(AL_MAX_DISTANCE),
    DECL(AL_SEC_OFFSET),
    DECL(AL_SAMPLE_OFFSET),
    DECL(AL_SAMPLE_RW_OFFSETS_SOFT),
    DECL(AL_BYTE_OFFSET),
    DECL(AL_BYTE_RW_OFFSETS_SOFT),
    DECL(AL_SOURCE_TYPE),
    DECL(AL_STATIC),
    DECL(AL_STREAMING),
    DECL(AL_UNDETERMINED),
    DECL(AL_METERS_PER_UNIT),
    DECL(AL_DIRECT_CHANNELS_SOFT),

    DECL(AL_DIRECT_FILTER),
    DECL(AL_AUXILIARY_SEND_FILTER),
    DECL(AL_AIR_ABSORPTION_FACTOR),
    DECL(AL_ROOM_ROLLOFF_FACTOR),
    DECL(AL_CONE_OUTER_GAINHF),
    DECL(AL_DIRECT_FILTER_GAINHF_AUTO),
    DECL(AL_AUXILIARY_SEND_FILTER_GAIN_AUTO),
    DECL(AL_AUXILIARY_SEND_FILTER_GAINHF_AUTO),

    DECL(AL_SOURCE_STATE),
    DECL(AL_INITIAL),
    DECL(AL_PLAYING),
    DECL(AL_PAUSED),
    DECL(AL_STOPPED),

    DECL(AL_BUFFERS_QUEUED),
    DECL(AL_BUFFERS_PROCESSED),

    DECL(AL_FORMAT_MONO8),
    DECL(AL_FORMAT_MONO16),
    DECL(AL_FORMAT_MONO_FLOAT32),
    DECL(AL_FORMAT_MONO_DOUBLE_EXT),
    DECL(AL_FORMAT_STEREO8),
    DECL(AL_FORMAT_STEREO16),
    DECL(AL_FORMAT_STEREO_FLOAT32),
    DECL(AL_FORMAT_STEREO_DOUBLE_EXT),
    DECL(AL_FORMAT_MONO_IMA4),
    DECL(AL_FORMAT_STEREO_IMA4),
    DECL(AL_FORMAT_MONO_MSADPCM_SOFT),
    DECL(AL_FORMAT_STEREO_MSADPCM_SOFT),
    DECL(AL_FORMAT_QUAD8_LOKI),
    DECL(AL_FORMAT_QUAD16_LOKI),
    DECL(AL_FORMAT_QUAD8),
    DECL(AL_FORMAT_QUAD16),
    DECL(AL_FORMAT_QUAD32),
    DECL(AL_FORMAT_51CHN8),
    DECL(AL_FORMAT_51CHN16),
    DECL(AL_FORMAT_51CHN32),
    DECL(AL_FORMAT_61CHN8),
    DECL(AL_FORMAT_61CHN16),
    DECL(AL_FORMAT_61CHN32),
    DECL(AL_FORMAT_71CHN8),
    DECL(AL_FORMAT_71CHN16),
    DECL(AL_FORMAT_71CHN32),
    DECL(AL_FORMAT_REAR8),
    DECL(AL_FORMAT_REAR16),
    DECL(AL_FORMAT_REAR32),
    DECL(AL_FORMAT_MONO_MULAW),
    DECL(AL_FORMAT_MONO_MULAW_EXT),
    DECL(AL_FORMAT_STEREO_MULAW),
    DECL(AL_FORMAT_STEREO_MULAW_EXT),
    DECL(AL_FORMAT_QUAD_MULAW),
    DECL(AL_FORMAT_51CHN_MULAW),
    DECL(AL_FORMAT_61CHN_MULAW),
    DECL(AL_FORMAT_71CHN_MULAW),
    DECL(AL_FORMAT_REAR_MULAW),
    DECL(AL_FORMAT_MONO_ALAW_EXT),
    DECL(AL_FORMAT_STEREO_ALAW_EXT),

    DECL(AL_MONO8_SOFT),
    DECL(AL_MONO16_SOFT),
    DECL(AL_MONO32F_SOFT),
    DECL(AL_STEREO8_SOFT),
    DECL(AL_STEREO16_SOFT),
    DECL(AL_STEREO32F_SOFT),
    DECL(AL_QUAD8_SOFT),
    DECL(AL_QUAD16_SOFT),
    DECL(AL_QUAD32F_SOFT),
    DECL(AL_REAR8_SOFT),
    DECL(AL_REAR16_SOFT),
    DECL(AL_REAR32F_SOFT),
    DECL(AL_5POINT1_8_SOFT),
    DECL(AL_5POINT1_16_SOFT),
    DECL(AL_5POINT1_32F_SOFT),
    DECL(AL_6POINT1_8_SOFT),
    DECL(AL_6POINT1_16_SOFT),
    DECL(AL_6POINT1_32F_SOFT),
    DECL(AL_7POINT1_8_SOFT),
    DECL(AL_7POINT1_16_SOFT),
    DECL(AL_7POINT1_32F_SOFT),

    DECL(AL_MONO_SOFT),
    DECL(AL_STEREO_SOFT),
    DECL(AL_QUAD_SOFT),
    DECL(AL_REAR_SOFT),
    DECL(AL_5POINT1_SOFT),
    DECL(AL_6POINT1_SOFT),
    DECL(AL_7POINT1_SOFT),

    DECL(AL_BYTE_SOFT),
    DECL(AL_UNSIGNED_BYTE_SOFT),
    DECL(AL_SHORT_SOFT),
    DECL(AL_UNSIGNED_SHORT_SOFT),
    DECL(AL_INT_SOFT),
    DECL(AL_UNSIGNED_INT_SOFT),
    DECL(AL_FLOAT_SOFT),
    DECL(AL_DOUBLE_SOFT),
    DECL(AL_BYTE3_SOFT),
    DECL(AL_UNSIGNED_BYTE3_SOFT),

    DECL(AL_FREQUENCY),
    DECL(AL_BITS),
    DECL(AL_CHANNELS),
    DECL(AL_SIZE),
    DECL(AL_INTERNAL_FORMAT_SOFT),
    DECL(AL_BYTE_LENGTH_SOFT),
    DECL(AL_SAMPLE_LENGTH_SOFT),
    DECL(AL_SEC_LENGTH_SOFT),
    DECL(AL_UNPACK_BLOCK_ALIGNMENT_SOFT),
    DECL(AL_PACK_BLOCK_ALIGNMENT_SOFT),

    DECL(AL_UNUSED),
    DECL(AL_PENDING),
    DECL(AL_PROCESSED),

    DECL(AL_NO_ERROR),
    DECL(AL_INVALID_NAME),
    DECL(AL_INVALID_ENUM),
    DECL(AL_INVALID_VALUE),
    DECL(AL_INVALID_OPERATION),
    DECL(AL_OUT_OF_MEMORY),

    DECL(AL_VENDOR),
    DECL(AL_VERSION),
    DECL(AL_RENDERER),
    DECL(AL_EXTENSIONS),

    DECL(AL_DOPPLER_FACTOR),
    DECL(AL_DOPPLER_VELOCITY),
    DECL(AL_DISTANCE_MODEL),
    DECL(AL_SPEED_OF_SOUND),
    DECL(AL_SOURCE_DISTANCE_MODEL),
    DECL(AL_DEFERRED_UPDATES_SOFT),

    DECL(AL_INVERSE_DISTANCE),
    DECL(AL_INVERSE_DISTANCE_CLAMPED),
    DECL(AL_LINEAR_DISTANCE),
    DECL(AL_LINEAR_DISTANCE_CLAMPED),
    DECL(AL_EXPONENT_DISTANCE),
    DECL(AL_EXPONENT_DISTANCE_CLAMPED),

    DECL(AL_FILTER_TYPE),
    DECL(AL_FILTER_NULL),
    DECL(AL_FILTER_LOWPASS),
    DECL(AL_FILTER_HIGHPASS),
    DECL(AL_FILTER_BANDPASS),

    DECL(AL_LOWPASS_GAIN),
    DECL(AL_LOWPASS_GAINHF),

    DECL(AL_HIGHPASS_GAIN),
    DECL(AL_HIGHPASS_GAINLF),

    DECL(AL_BANDPASS_GAIN),
    DECL(AL_BANDPASS_GAINHF),
    DECL(AL_BANDPASS_GAINLF),

    DECL(AL_EFFECT_TYPE),
    DECL(AL_EFFECT_NULL),
    DECL(AL_EFFECT_REVERB),
    DECL(AL_EFFECT_EAXREVERB),
    DECL(AL_EFFECT_CHORUS),
    DECL(AL_EFFECT_DISTORTION),
    DECL(AL_EFFECT_ECHO),
    DECL(AL_EFFECT_FLANGER),
#if 0
    DECL(AL_EFFECT_FREQUENCY_SHIFTER),
    DECL(AL_EFFECT_VOCAL_MORPHER),
    DECL(AL_EFFECT_PITCH_SHIFTER),
#endif
    DECL(AL_EFFECT_RING_MODULATOR),
#if 0
    DECL(AL_EFFECT_AUTOWAH),
#endif
    DECL(AL_EFFECT_COMPRESSOR),
    DECL(AL_EFFECT_EQUALIZER),
    DECL(AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT),
    DECL(AL_EFFECT_DEDICATED_DIALOGUE),

    DECL(AL_EAXREVERB_DENSITY),
    DECL(AL_EAXREVERB_DIFFUSION),
    DECL(AL_EAXREVERB_GAIN),
    DECL(AL_EAXREVERB_GAINHF),
    DECL(AL_EAXREVERB_GAINLF),
    DECL(AL_EAXREVERB_DECAY_TIME),
    DECL(AL_EAXREVERB_DECAY_HFRATIO),
    DECL(AL_EAXREVERB_DECAY_LFRATIO),
    DECL(AL_EAXREVERB_REFLECTIONS_GAIN),
    DECL(AL_EAXREVERB_REFLECTIONS_DELAY),
    DECL(AL_EAXREVERB_REFLECTIONS_PAN),
    DECL(AL_EAXREVERB_LATE_REVERB_GAIN),
    DECL(AL_EAXREVERB_LATE_REVERB_DELAY),
    DECL(AL_EAXREVERB_LATE_REVERB_PAN),
    DECL(AL_EAXREVERB_ECHO_TIME),
    DECL(AL_EAXREVERB_ECHO_DEPTH),
    DECL(AL_EAXREVERB_MODULATION_TIME),
    DECL(AL_EAXREVERB_MODULATION_DEPTH),
    DECL(AL_EAXREVERB_AIR_ABSORPTION_GAINHF),
    DECL(AL_EAXREVERB_HFREFERENCE),
    DECL(AL_EAXREVERB_LFREFERENCE),
    DECL(AL_EAXREVERB_ROOM_ROLLOFF_FACTOR),
    DECL(AL_EAXREVERB_DECAY_HFLIMIT),

    DECL(AL_REVERB_DENSITY),
    DECL(AL_REVERB_DIFFUSION),
    DECL(AL_REVERB_GAIN),
    DECL(AL_REVERB_GAINHF),
    DECL(AL_REVERB_DECAY_TIME),
    DECL(AL_REVERB_DECAY_HFRATIO),
    DECL(AL_REVERB_REFLECTIONS_GAIN),
    DECL(AL_REVERB_REFLECTIONS_DELAY),
    DECL(AL_REVERB_LATE_REVERB_GAIN),
    DECL(AL_REVERB_LATE_REVERB_DELAY),
    DECL(AL_REVERB_AIR_ABSORPTION_GAINHF),
    DECL(AL_REVERB_ROOM_ROLLOFF_FACTOR),
    DECL(AL_REVERB_DECAY_HFLIMIT),

    DECL(AL_CHORUS_WAVEFORM),
    DECL(AL_CHORUS_PHASE),
    DECL(AL_CHORUS_RATE),
    DECL(AL_CHORUS_DEPTH),
    DECL(AL_CHORUS_FEEDBACK),
    DECL(AL_CHORUS_DELAY),

    DECL(AL_DISTORTION_EDGE),
    DECL(AL_DISTORTION_GAIN),
    DECL(AL_DISTORTION_LOWPASS_CUTOFF),
    DECL(AL_DISTORTION_EQCENTER),
    DECL(AL_DISTORTION_EQBANDWIDTH),

    DECL(AL_ECHO_DELAY),
    DECL(AL_ECHO_LRDELAY),
    DECL(AL_ECHO_DAMPING),
    DECL(AL_ECHO_FEEDBACK),
    DECL(AL_ECHO_SPREAD),

    DECL(AL_FLANGER_WAVEFORM),
    DECL(AL_FLANGER_PHASE),
    DECL(AL_FLANGER_RATE),
    DECL(AL_FLANGER_DEPTH),
    DECL(AL_FLANGER_FEEDBACK),
    DECL(AL_FLANGER_DELAY),

    DECL(AL_RING_MODULATOR_FREQUENCY),
    DECL(AL_RING_MODULATOR_HIGHPASS_CUTOFF),
    DECL(AL_RING_MODULATOR_WAVEFORM),

#if 0
    DECL(AL_AUTOWAH_ATTACK_TIME),
    DECL(AL_AUTOWAH_PEAK_GAIN),
    DECL(AL_AUTOWAH_RELEASE_TIME),
    DECL(AL_AUTOWAH_RESONANCE),
#endif

    DECL(AL_COMPRESSOR_ONOFF),

    DECL(AL_EQUALIZER_LOW_GAIN),
    DECL(AL_EQUALIZER_LOW_CUTOFF),
    DECL(AL_EQUALIZER_MID1_GAIN),
    DECL(AL_EQUALIZER_MID1_CENTER),
    DECL(AL_EQUALIZER_MID1_WIDTH),
    DECL(AL_EQUALIZER_MID2_GAIN),
    DECL(AL_EQUALIZER_MID2_CENTER),
    DECL(AL_EQUALIZER_MID2_WIDTH),
    DECL(AL_EQUALIZER_HIGH_GAIN),
    DECL(AL_EQUALIZER_HIGH_CUTOFF),

    DECL(AL_DEDICATED_GAIN),

    { NULL, (ALCenum)0 }
};
#undef DECL

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";


/************************************************
 * Global variables
 ************************************************/

/* Enumerated device names */
static const ALCchar alcDefaultName[] = "OpenAL Soft\0";

static al_string alcAllDevicesList;
static al_string alcCaptureDeviceList;

/* Default is always the first in the list */
static ALCchar *alcDefaultAllDevicesSpecifier;
static ALCchar *alcCaptureDefaultDeviceSpecifier;

/* Default context extensions */
static const ALchar alExtList[] =
    "AL_EXT_ALAW AL_EXT_DOUBLE AL_EXT_EXPONENT_DISTANCE AL_EXT_FLOAT32 "
    "AL_EXT_IMA4 AL_EXT_LINEAR_DISTANCE AL_EXT_MCFORMATS AL_EXT_MULAW "
    "AL_EXT_MULAW_MCFORMATS AL_EXT_OFFSET AL_EXT_source_distance_model "
    "AL_LOKI_quadriphonic AL_SOFT_block_alignment AL_SOFT_buffer_samples "
    "AL_SOFT_buffer_sub_data AL_SOFT_deferred_updates AL_SOFT_direct_channels "
    "AL_SOFT_loop_points AL_SOFT_MSADPCM AL_SOFT_source_latency "
    "AL_SOFT_source_length";

static ATOMIC(ALCenum) LastNullDeviceError = ATOMIC_INIT_STATIC(ALC_NO_ERROR);

/* Thread-local current context */
static altss_t LocalContext;
/* Process-wide current context */
static ATOMIC(ALCcontext*) GlobalContext = ATOMIC_INIT_STATIC(NULL);

/* Mixing thread piority level */
ALint RTPrioLevel;

FILE *LogFile;
#ifdef _DEBUG
enum LogLevel LogLevel = LogWarning;
#else
enum LogLevel LogLevel = LogError;
#endif

/* Flag to trap ALC device errors */
static ALCboolean TrapALCError = ALC_FALSE;

/* One-time configuration init control */
static alonce_flag alc_config_once = AL_ONCE_FLAG_INIT;

/* Default effect that applies to sources that don't have an effect on send 0 */
static ALeffect DefaultEffect;


/************************************************
 * ALC information
 ************************************************/
static const ALCchar alcNoDeviceExtList[] =
    "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE "
    "ALC_EXT_thread_local_context ALC_SOFT_loopback";
static const ALCchar alcExtensionList[] =
    "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE "
    "ALC_EXT_DEDICATED ALC_EXT_disconnect ALC_EXT_EFX "
    "ALC_EXT_thread_local_context ALC_SOFTX_device_clock ALC_SOFTX_HRTF "
    "ALC_SOFT_loopback ALC_SOFTX_midi_interface ALC_SOFT_pause_device";
static const ALCint alcMajorVersion = 1;
static const ALCint alcMinorVersion = 1;

static const ALCint alcEFXMajorVersion = 1;
static const ALCint alcEFXMinorVersion = 0;


/************************************************
 * Device lists
 ************************************************/
static ATOMIC(ALCdevice*) DeviceList = ATOMIC_INIT_STATIC(NULL);

static almtx_t ListLock;
static inline void LockLists(void)
{
    int lockret = almtx_lock(&ListLock);
    assert(lockret == althrd_success);
}
static inline void UnlockLists(void)
{
    int unlockret = almtx_unlock(&ListLock);
    assert(unlockret == althrd_success);
}

/************************************************
 * Library initialization
 ************************************************/
#if defined(_WIN32)
static void alc_init(void);
static void alc_deinit(void);
static void alc_deinit_safe(void);

#ifndef AL_LIBTYPE_STATIC
BOOL APIENTRY DllMain(HINSTANCE hModule, DWORD reason, LPVOID lpReserved)
{
    switch(reason)
    {
        case DLL_PROCESS_ATTACH:
            /* Pin the DLL so we won't get unloaded until the process terminates */
            GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_PIN | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
                               (WCHAR*)hModule, &hModule);
            alc_init();
            break;

        case DLL_THREAD_DETACH:
            break;

        case DLL_PROCESS_DETACH:
            if(!lpReserved)
                alc_deinit();
            else
                alc_deinit_safe();
            break;
    }
    return TRUE;
}
#elif defined(_MSC_VER)
#pragma section(".CRT$XCU",read)
static void alc_constructor(void);
static void alc_destructor(void);
__declspec(allocate(".CRT$XCU")) void (__cdecl* alc_constructor_)(void) = alc_constructor;

static void alc_constructor(void)
{
    atexit(alc_destructor);
    alc_init();
}

static void alc_destructor(void)
{
    alc_deinit();
}
#elif defined(HAVE_GCC_DESTRUCTOR)
static void alc_init(void) __attribute__((constructor));
static void alc_deinit(void) __attribute__((destructor));
#else
#error "No static initialization available on this platform!"
#endif

#elif defined(HAVE_GCC_DESTRUCTOR)

static void alc_init(void) __attribute__((constructor));
static void alc_deinit(void) __attribute__((destructor));

#else
#error "No global initialization available on this platform!"
#endif

static void ReleaseThreadCtx(void *ptr);
static void alc_init(void)
{
    const char *str;
    int ret;

    LogFile = stderr;

    AL_STRING_INIT(alcAllDevicesList);
    AL_STRING_INIT(alcCaptureDeviceList);

    str = getenv("__ALSOFT_HALF_ANGLE_CONES");
    if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
        ConeScale *= 0.5f;

    str = getenv("__ALSOFT_REVERSE_Z");
    if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
        ZScale *= -1.0f;

    ret = altss_create(&LocalContext, ReleaseThreadCtx);
    assert(ret == althrd_success);

    ret = almtx_init(&ListLock, almtx_recursive);
    assert(ret == althrd_success);

    ThunkInit();
}

static void alc_initconfig(void)
{
    const char *devs, *str;
    ALuint capfilter;
    float valf;
    int i, n;

    str = getenv("ALSOFT_LOGLEVEL");
    if(str)
    {
        long lvl = strtol(str, NULL, 0);
        if(lvl >= NoLog && lvl <= LogRef)
            LogLevel = lvl;
    }

    str = getenv("ALSOFT_LOGFILE");
    if(str && str[0])
    {
        FILE *logfile = al_fopen(str, "wt");
        if(logfile) LogFile = logfile;
        else ERR("Failed to open log file '%s'\n", str);
    }

    {
        char buf[1024] = "";
        int len = snprintf(buf, sizeof(buf), "%s", BackendList[0].name);
        for(i = 1;BackendList[i].name;i++)
            len += snprintf(buf+len, sizeof(buf)-len, ", %s", BackendList[i].name);
        TRACE("Supported backends: %s\n", buf);
    }
    ReadALConfig();

    capfilter = 0;
#if defined(HAVE_SSE4_1)
    capfilter |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE4_1;
#elif defined(HAVE_SSE2)
    capfilter |= CPU_CAP_SSE | CPU_CAP_SSE2;
#elif defined(HAVE_SSE)
    capfilter |= CPU_CAP_SSE;
#endif
#ifdef HAVE_NEON
    capfilter |= CPU_CAP_NEON;
#endif
    if(ConfigValueStr(NULL, "disable-cpu-exts", &str))
    {
        if(strcasecmp(str, "all") == 0)
            capfilter = 0;
        else
        {
            size_t len;
            const char *next = str;

            do {
                str = next;
                while(isspace(str[0]))
                    str++;
                next = strchr(str, ',');

                if(!str[0] || str[0] == ',')
                    continue;

                len = (next ? ((size_t)(next-str)) : strlen(str));
                while(len > 0 && isspace(str[len-1]))
                    len--;
                if(len == 3 && strncasecmp(str, "sse", len) == 0)
                    capfilter &= ~CPU_CAP_SSE;
                else if(len == 4 && strncasecmp(str, "sse2", len) == 0)
                    capfilter &= ~CPU_CAP_SSE2;
                else if(len == 6 && strncasecmp(str, "sse4.1", len) == 0)
                    capfilter &= ~CPU_CAP_SSE4_1;
                else if(len == 4 && strncasecmp(str, "neon", len) == 0)
                    capfilter &= ~CPU_CAP_NEON;
                else
                    WARN("Invalid CPU extension \"%s\"\n", str);
            } while(next++);
        }
    }
    FillCPUCaps(capfilter);

#ifdef _WIN32
    RTPrioLevel = 1;
#else
    RTPrioLevel = 0;
#endif
    ConfigValueInt(NULL, "rt-prio", &RTPrioLevel);

    if(ConfigValueStr(NULL, "resampler", &str))
    {
        if(strcasecmp(str, "point") == 0 || strcasecmp(str, "none") == 0)
            DefaultResampler = PointResampler;
        else if(strcasecmp(str, "linear") == 0)
            DefaultResampler = LinearResampler;
        else if(strcasecmp(str, "cubic") == 0)
            DefaultResampler = CubicResampler;
        else
        {
            char *end;

            n = strtol(str, &end, 0);
            if(*end == '\0' && (n == PointResampler || n == LinearResampler || n == CubicResampler))
                DefaultResampler = n;
            else
                WARN("Invalid resampler: %s\n", str);
        }
    }

    str = getenv("ALSOFT_TRAP_ERROR");
    if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
    {
        TrapALError  = AL_TRUE;
        TrapALCError = AL_TRUE;
    }
    else
    {
        str = getenv("ALSOFT_TRAP_AL_ERROR");
        if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
            TrapALError = AL_TRUE;
        TrapALError = GetConfigValueBool(NULL, "trap-al-error", TrapALError);

        str = getenv("ALSOFT_TRAP_ALC_ERROR");
        if(str && (strcasecmp(str, "true") == 0 || strtol(str, NULL, 0) == 1))
            TrapALCError = ALC_TRUE;
        TrapALCError = GetConfigValueBool(NULL, "trap-alc-error", TrapALCError);
    }

    if(ConfigValueFloat("reverb", "boost", &valf))
        ReverbBoost *= powf(10.0f, valf / 20.0f);

    EmulateEAXReverb = GetConfigValueBool("reverb", "emulate-eax", AL_FALSE);

    if(((devs=getenv("ALSOFT_DRIVERS")) && devs[0]) ||
       ConfigValueStr(NULL, "drivers", &devs))
    {
        int n;
        size_t len;
        const char *next = devs;
        int endlist, delitem;

        i = 0;
        do {
            devs = next;
            while(isspace(devs[0]))
                devs++;
            next = strchr(devs, ',');

            delitem = (devs[0] == '-');
            if(devs[0] == '-') devs++;

            if(!devs[0] || devs[0] == ',')
            {
                endlist = 0;
                continue;
            }
            endlist = 1;

            len = (next ? ((size_t)(next-devs)) : strlen(devs));
            while(len > 0 && isspace(devs[len-1]))
                len--;
            for(n = i;BackendList[n].name;n++)
            {
                if(len == strlen(BackendList[n].name) &&
                   strncmp(BackendList[n].name, devs, len) == 0)
                {
                    if(delitem)
                    {
                        do {
                            BackendList[n] = BackendList[n+1];
                            ++n;
                        } while(BackendList[n].name);
                    }
                    else
                    {
                        struct BackendInfo Bkp = BackendList[n];
                        while(n > i)
                        {
                            BackendList[n] = BackendList[n-1];
                            --n;
                        }
                        BackendList[n] = Bkp;

                        i++;
                    }
                    break;
                }
            }
        } while(next++);

        if(endlist)
        {
            BackendList[i].name = NULL;
            BackendList[i].getFactory = NULL;
            BackendList[i].Init = NULL;
            BackendList[i].Deinit = NULL;
            BackendList[i].Probe = NULL;
        }
    }

    for(i = 0;(BackendList[i].Init || BackendList[i].getFactory) && (!PlaybackBackend.name || !CaptureBackend.name);i++)
    {
        if(BackendList[i].getFactory)
        {
            ALCbackendFactory *factory = BackendList[i].getFactory();
            if(!V0(factory,init)())
            {
                WARN("Failed to initialize backend \"%s\"\n", BackendList[i].name);
                continue;
            }

            TRACE("Initialized backend \"%s\"\n", BackendList[i].name);
            if(!PlaybackBackend.name && V(factory,querySupport)(ALCbackend_Playback))
            {
                PlaybackBackend = BackendList[i];
                TRACE("Added \"%s\" for playback\n", PlaybackBackend.name);
            }
            if(!CaptureBackend.name && V(factory,querySupport)(ALCbackend_Capture))
            {
                CaptureBackend = BackendList[i];
                TRACE("Added \"%s\" for capture\n", CaptureBackend.name);
            }

            continue;
        }

        if(!BackendList[i].Init(&BackendList[i].Funcs))
        {
            WARN("Failed to initialize backend \"%s\"\n", BackendList[i].name);
            continue;
        }

        TRACE("Initialized backend \"%s\"\n", BackendList[i].name);
        if(BackendList[i].Funcs.OpenPlayback && !PlaybackBackend.name)
        {
            PlaybackBackend = BackendList[i];
            TRACE("Added \"%s\" for playback\n", PlaybackBackend.name);
        }
        if(BackendList[i].Funcs.OpenCapture && !CaptureBackend.name)
        {
            CaptureBackend = BackendList[i];
            TRACE("Added \"%s\" for capture\n", CaptureBackend.name);
        }
    }
    {
        ALCbackendFactory *factory = ALCloopbackFactory_getFactory();
        V0(factory,init)();
    }

    if(ConfigValueStr(NULL, "excludefx", &str))
    {
        size_t len;
        const char *next = str;

        do {
            str = next;
            next = strchr(str, ',');

            if(!str[0] || next == str)
                continue;

            len = (next ? ((size_t)(next-str)) : strlen(str));
            for(n = 0;EffectList[n].name;n++)
            {
                if(len == strlen(EffectList[n].name) &&
                   strncmp(EffectList[n].name, str, len) == 0)
                    DisabledEffects[EffectList[n].type] = AL_TRUE;
            }
        } while(next++);
    }

    InitEffectFactoryMap();

    InitEffect(&DefaultEffect);
    str = getenv("ALSOFT_DEFAULT_REVERB");
    if((str && str[0]) || ConfigValueStr(NULL, "default-reverb", &str))
        LoadReverbPreset(str, &DefaultEffect);
}
#define DO_INITCONFIG() alcall_once(&alc_config_once, alc_initconfig)


/************************************************
 * Library deinitialization
 ************************************************/
static void alc_cleanup(void)
{
    ALCdevice *dev;

    AL_STRING_DEINIT(alcAllDevicesList);
    AL_STRING_DEINIT(alcCaptureDeviceList);

    free(alcDefaultAllDevicesSpecifier);
    alcDefaultAllDevicesSpecifier = NULL;
    free(alcCaptureDefaultDeviceSpecifier);
    alcCaptureDefaultDeviceSpecifier = NULL;

    if((dev=ATOMIC_EXCHANGE(ALCdevice*, &DeviceList, NULL)) != NULL)
    {
        ALCuint num = 0;
        do {
            num++;
        } while((dev=dev->next) != NULL);
        ERR("%u device%s not closed\n", num, (num>1)?"s":"");
    }

    DeinitEffectFactoryMap();
}

static void alc_deinit_safe(void)
{
    alc_cleanup();

    FreeHrtfs();
    FreeALConfig();

    ThunkExit();
    almtx_destroy(&ListLock);
    altss_delete(LocalContext);

    if(LogFile != stderr)
        fclose(LogFile);
    LogFile = NULL;
}

static void alc_deinit(void)
{
    int i;

    alc_cleanup();

    memset(&PlaybackBackend, 0, sizeof(PlaybackBackend));
    memset(&CaptureBackend, 0, sizeof(CaptureBackend));

    for(i = 0;BackendList[i].Deinit || BackendList[i].getFactory;i++)
    {
        if(!BackendList[i].getFactory)
            BackendList[i].Deinit();
        else
        {
            ALCbackendFactory *factory = BackendList[i].getFactory();
            V0(factory,deinit)();
        }
    }
    {
        ALCbackendFactory *factory = ALCloopbackFactory_getFactory();
        V0(factory,deinit)();
    }

    alc_deinit_safe();
}


/************************************************
 * Device enumeration
 ************************************************/
static void ProbeDevices(al_string *list, enum DevProbe type)
{
    DO_INITCONFIG();

    LockLists();
    al_string_clear(list);

    if(type == ALL_DEVICE_PROBE && (PlaybackBackend.Probe || PlaybackBackend.getFactory))
    {
        if(!PlaybackBackend.getFactory)
            PlaybackBackend.Probe(type);
        else
        {
            ALCbackendFactory *factory = PlaybackBackend.getFactory();
            V(factory,probe)(type);
        }
    }
    else if(type == CAPTURE_DEVICE_PROBE && (CaptureBackend.Probe || CaptureBackend.getFactory))
    {
        if(!CaptureBackend.getFactory)
            CaptureBackend.Probe(type);
        else
        {
            ALCbackendFactory *factory = CaptureBackend.getFactory();
            V(factory,probe)(type);
        }
    }
    UnlockLists();
}
static void ProbeAllDevicesList(void)
{ ProbeDevices(&alcAllDevicesList, ALL_DEVICE_PROBE); }
static void ProbeCaptureDeviceList(void)
{ ProbeDevices(&alcCaptureDeviceList, CAPTURE_DEVICE_PROBE); }

static void AppendDevice(const ALCchar *name, al_string *devnames)
{
    size_t len = strlen(name);
    if(len > 0)
    {
        al_string_append_range(devnames, name, name+len);
        al_string_append_char(devnames, '\0');
    }
}
void AppendAllDevicesList(const ALCchar *name)
{ AppendDevice(name, &alcAllDevicesList); }
void AppendCaptureDeviceList(const ALCchar *name)
{ AppendDevice(name, &alcCaptureDeviceList); }


/************************************************
 * Device format information
 ************************************************/
const ALCchar *DevFmtTypeString(enum DevFmtType type)
{
    switch(type)
    {
    case DevFmtByte: return "Signed Byte";
    case DevFmtUByte: return "Unsigned Byte";
    case DevFmtShort: return "Signed Short";
    case DevFmtUShort: return "Unsigned Short";
    case DevFmtInt: return "Signed Int";
    case DevFmtUInt: return "Unsigned Int";
    case DevFmtFloat: return "Float";
    }
    return "(unknown type)";
}
const ALCchar *DevFmtChannelsString(enum DevFmtChannels chans)
{
    switch(chans)
    {
    case DevFmtMono: return "Mono";
    case DevFmtStereo: return "Stereo";
    case DevFmtQuad: return "Quadraphonic";
    case DevFmtX51: return "5.1 Surround";
    case DevFmtX51Side: return "5.1 Side";
    case DevFmtX61: return "6.1 Surround";
    case DevFmtX71: return "7.1 Surround";
    }
    return "(unknown channels)";
}

extern inline ALuint FrameSizeFromDevFmt(enum DevFmtChannels chans, enum DevFmtType type);
ALuint BytesFromDevFmt(enum DevFmtType type)
{
    switch(type)
    {
    case DevFmtByte: return sizeof(ALbyte);
    case DevFmtUByte: return sizeof(ALubyte);
    case DevFmtShort: return sizeof(ALshort);
    case DevFmtUShort: return sizeof(ALushort);
    case DevFmtInt: return sizeof(ALint);
    case DevFmtUInt: return sizeof(ALuint);
    case DevFmtFloat: return sizeof(ALfloat);
    }
    return 0;
}
ALuint ChannelsFromDevFmt(enum DevFmtChannels chans)
{
    switch(chans)
    {
    case DevFmtMono: return 1;
    case DevFmtStereo: return 2;
    case DevFmtQuad: return 4;
    case DevFmtX51: return 6;
    case DevFmtX51Side: return 6;
    case DevFmtX61: return 7;
    case DevFmtX71: return 8;
    }
    return 0;
}

DECL_CONST static ALboolean DecomposeDevFormat(ALenum format,
  enum DevFmtChannels *chans, enum DevFmtType *type)
{
    static const struct {
        ALenum format;
        enum DevFmtChannels channels;
        enum DevFmtType type;
    } list[] = {
        { AL_FORMAT_MONO8,        DevFmtMono, DevFmtUByte },
        { AL_FORMAT_MONO16,       DevFmtMono, DevFmtShort },
        { AL_FORMAT_MONO_FLOAT32, DevFmtMono, DevFmtFloat },

        { AL_FORMAT_STEREO8,        DevFmtStereo, DevFmtUByte },
        { AL_FORMAT_STEREO16,       DevFmtStereo, DevFmtShort },
        { AL_FORMAT_STEREO_FLOAT32, DevFmtStereo, DevFmtFloat },

        { AL_FORMAT_QUAD8,  DevFmtQuad, DevFmtUByte },
        { AL_FORMAT_QUAD16, DevFmtQuad, DevFmtShort },
        { AL_FORMAT_QUAD32, DevFmtQuad, DevFmtFloat },

        { AL_FORMAT_51CHN8,  DevFmtX51, DevFmtUByte },
        { AL_FORMAT_51CHN16, DevFmtX51, DevFmtShort },
        { AL_FORMAT_51CHN32, DevFmtX51, DevFmtFloat },

        { AL_FORMAT_61CHN8,  DevFmtX61, DevFmtUByte },
        { AL_FORMAT_61CHN16, DevFmtX61, DevFmtShort },
        { AL_FORMAT_61CHN32, DevFmtX61, DevFmtFloat },

        { AL_FORMAT_71CHN8,  DevFmtX71, DevFmtUByte },
        { AL_FORMAT_71CHN16, DevFmtX71, DevFmtShort },
        { AL_FORMAT_71CHN32, DevFmtX71, DevFmtFloat },
    };
    ALuint i;

    for(i = 0;i < COUNTOF(list);i++)
    {
        if(list[i].format == format)
        {
            *chans = list[i].channels;
            *type  = list[i].type;
            return AL_TRUE;
        }
    }

    return AL_FALSE;
}

DECL_CONST static ALCboolean IsValidALCType(ALCenum type)
{
    switch(type)
    {
        case ALC_BYTE_SOFT:
        case ALC_UNSIGNED_BYTE_SOFT:
        case ALC_SHORT_SOFT:
        case ALC_UNSIGNED_SHORT_SOFT:
        case ALC_INT_SOFT:
        case ALC_UNSIGNED_INT_SOFT:
        case ALC_FLOAT_SOFT:
            return ALC_TRUE;
    }
    return ALC_FALSE;
}

DECL_CONST static ALCboolean IsValidALCChannels(ALCenum channels)
{
    switch(channels)
    {
        case ALC_MONO_SOFT:
        case ALC_STEREO_SOFT:
        case ALC_QUAD_SOFT:
        case ALC_5POINT1_SOFT:
        case ALC_6POINT1_SOFT:
        case ALC_7POINT1_SOFT:
            return ALC_TRUE;
    }
    return ALC_FALSE;
}


/************************************************
 * Miscellaneous ALC helpers
 ************************************************/
extern inline void LockContext(ALCcontext *context);
extern inline void UnlockContext(ALCcontext *context);

ALint64 ALCdevice_GetLatencyDefault(ALCdevice *UNUSED(device))
{
    return 0;
}

ALint64 ALCdevice_GetLatency(ALCdevice *device)
{
    return V0(device->Backend,getLatency)();
}

void ALCdevice_Lock(ALCdevice *device)
{
    V0(device->Backend,lock)();
}

void ALCdevice_Unlock(ALCdevice *device)
{
    V0(device->Backend,unlock)();
}


/* SetDefaultWFXChannelOrder
 *
 * Sets the default channel order used by WaveFormatEx.
 */
void SetDefaultWFXChannelOrder(ALCdevice *device)
{
    ALuint i;

    for(i = 0;i < MaxChannels;i++)
        device->ChannelOffsets[i] = INVALID_OFFSET;

    switch(device->FmtChans)
    {
    case DevFmtMono: device->ChannelOffsets[FrontCenter] = 0;
                     break;
    case DevFmtStereo: device->ChannelOffsets[FrontLeft]  = 0;
                       device->ChannelOffsets[FrontRight] = 1;
                       break;
    case DevFmtQuad: device->ChannelOffsets[FrontLeft]  = 0;
                     device->ChannelOffsets[FrontRight] = 1;
                     device->ChannelOffsets[BackLeft]   = 2;
                     device->ChannelOffsets[BackRight]  = 3;
                     break;
    case DevFmtX51: device->ChannelOffsets[FrontLeft]   = 0;
                    device->ChannelOffsets[FrontRight]  = 1;
                    device->ChannelOffsets[FrontCenter] = 2;
                    device->ChannelOffsets[LFE]         = 3;
                    device->ChannelOffsets[BackLeft]    = 4;
                    device->ChannelOffsets[BackRight]   = 5;
                    break;
    case DevFmtX51Side: device->ChannelOffsets[FrontLeft]   = 0;
                        device->ChannelOffsets[FrontRight]  = 1;
                        device->ChannelOffsets[FrontCenter] = 2;
                        device->ChannelOffsets[LFE]         = 3;
                        device->ChannelOffsets[SideLeft]    = 4;
                        device->ChannelOffsets[SideRight]   = 5;
                        break;
    case DevFmtX61: device->ChannelOffsets[FrontLeft]   = 0;
                    device->ChannelOffsets[FrontRight]  = 1;
                    device->ChannelOffsets[FrontCenter] = 2;
                    device->ChannelOffsets[LFE]         = 3;
                    device->ChannelOffsets[BackCenter]  = 4;
                    device->ChannelOffsets[SideLeft]    = 5;
                    device->ChannelOffsets[SideRight]   = 6;
                    break;
    case DevFmtX71: device->ChannelOffsets[FrontLeft]   = 0;
                    device->ChannelOffsets[FrontRight]  = 1;
                    device->ChannelOffsets[FrontCenter] = 2;
                    device->ChannelOffsets[LFE]         = 3;
                    device->ChannelOffsets[BackLeft]    = 4;
                    device->ChannelOffsets[BackRight]   = 5;
                    device->ChannelOffsets[SideLeft]    = 6;
                    device->ChannelOffsets[SideRight]   = 7;
                    break;
    }
}

/* SetDefaultChannelOrder
 *
 * Sets the default channel order used by most non-WaveFormatEx-based APIs.
 */
void SetDefaultChannelOrder(ALCdevice *device)
{
    ALuint i;

    for(i = 0;i < MaxChannels;i++)
        device->ChannelOffsets[i] = INVALID_OFFSET;

    switch(device->FmtChans)
    {
    case DevFmtX51: device->ChannelOffsets[FrontLeft]   = 0;
                    device->ChannelOffsets[FrontRight]  = 1;
                    device->ChannelOffsets[BackLeft]    = 2;
                    device->ChannelOffsets[BackRight]   = 3;
                    device->ChannelOffsets[FrontCenter] = 4;
                    device->ChannelOffsets[LFE]         = 5;
                    return;
    case DevFmtX71: device->ChannelOffsets[FrontLeft]   = 0;
                    device->ChannelOffsets[FrontRight]  = 1;
                    device->ChannelOffsets[BackLeft]    = 2;
                    device->ChannelOffsets[BackRight]   = 3;
                    device->ChannelOffsets[FrontCenter] = 4;
                    device->ChannelOffsets[LFE]         = 5;
                    device->ChannelOffsets[SideLeft]    = 6;
                    device->ChannelOffsets[SideRight]   = 7;
                    return;

    /* Same as WFX order */
    case DevFmtMono:
    case DevFmtStereo:
    case DevFmtQuad:
    case DevFmtX51Side:
    case DevFmtX61:
        break;
    }
    SetDefaultWFXChannelOrder(device);
}


/* alcSetError
 *
 * Stores the latest ALC device error
 */
static void alcSetError(ALCdevice *device, ALCenum errorCode)
{
    if(TrapALCError)
    {
#ifdef _WIN32
        /* DebugBreak() will cause an exception if there is no debugger */
        if(IsDebuggerPresent())
            DebugBreak();
#elif defined(SIGTRAP)
        raise(SIGTRAP);
#endif
    }

    if(device)
        ATOMIC_STORE(&device->LastError, errorCode);
    else
        ATOMIC_STORE(&LastNullDeviceError, errorCode);
}


/* UpdateClockBase
 *
 * Updates the device's base clock time with however many samples have been
 * done. This is used so frequency changes on the device don't cause the time
 * to jump forward or back.
 */
static inline void UpdateClockBase(ALCdevice *device)
{
    device->ClockBase += device->SamplesDone * DEVICE_CLOCK_RES / device->Frequency;
    device->SamplesDone = 0;
}

/* UpdateDeviceParams
 *
 * Updates device parameters according to the attribute list (caller is
 * responsible for holding the list lock).
 */
static ALCenum UpdateDeviceParams(ALCdevice *device, const ALCint *attrList)
{
    ALCcontext *context;
    enum DevFmtChannels oldChans;
    enum DevFmtType oldType;
    ALCuint oldFreq;
    FPUCtl oldMode;

    // Check for attributes
    if(device->Type == Loopback)
    {
        enum {
            GotFreq  = 1<<0,
            GotChans = 1<<1,
            GotType  = 1<<2,
            GotAll   = GotFreq|GotChans|GotType
        };
        ALCuint freq, numMono, numStereo, numSends, flags;
        enum DevFmtChannels schans;
        enum DevFmtType stype;
        ALCuint attrIdx = 0;
        ALCint gotFmt = 0;

        if(!attrList)
        {
            WARN("Missing attributes for loopback device\n");
            return ALC_INVALID_VALUE;
        }

        numMono = device->NumMonoSources;
        numStereo = device->NumStereoSources;
        numSends = device->NumAuxSends;
        schans = device->FmtChans;
        stype = device->FmtType;
        freq = device->Frequency;
        flags = device->Flags;

        while(attrList[attrIdx])
        {
            if(attrList[attrIdx] == ALC_FORMAT_CHANNELS_SOFT)
            {
                ALCint val = attrList[attrIdx + 1];
                if(!IsValidALCChannels(val) || !ChannelsFromDevFmt(val))
                    return ALC_INVALID_VALUE;
                schans = val;
                gotFmt |= GotChans;
            }

            if(attrList[attrIdx] == ALC_FORMAT_TYPE_SOFT)
            {
                ALCint val = attrList[attrIdx + 1];
                if(!IsValidALCType(val) || !BytesFromDevFmt(val))
                    return ALC_INVALID_VALUE;
                stype = val;
                gotFmt |= GotType;
            }

            if(attrList[attrIdx] == ALC_FREQUENCY)
            {
                freq = attrList[attrIdx + 1];
                if(freq < MIN_OUTPUT_RATE)
                    return ALC_INVALID_VALUE;
                gotFmt |= GotFreq;
            }

            if(attrList[attrIdx] == ALC_STEREO_SOURCES)
            {
                numStereo = attrList[attrIdx + 1];
                if(numStereo > device->MaxNoOfSources)
                    numStereo = device->MaxNoOfSources;

                numMono = device->MaxNoOfSources - numStereo;
            }

            if(attrList[attrIdx] == ALC_MAX_AUXILIARY_SENDS)
                numSends = attrList[attrIdx + 1];

            if(attrList[attrIdx] == ALC_HRTF_SOFT)
            {
                if(attrList[attrIdx + 1] != ALC_FALSE)
                    flags |= DEVICE_HRTF_REQUEST;
                else
                    flags &= ~DEVICE_HRTF_REQUEST;
            }

            attrIdx += 2;
        }

        if(gotFmt != GotAll)
        {
            WARN("Missing format for loopback device\n");
            return ALC_INVALID_VALUE;
        }

        ConfigValueUInt(NULL, "sends", &numSends);
        numSends = minu(MAX_SENDS, numSends);

        if((device->Flags&DEVICE_RUNNING))
            V0(device->Backend,stop)();
        device->Flags = (flags & ~DEVICE_RUNNING);

        UpdateClockBase(device);

        device->Frequency = freq;
        device->FmtChans = schans;
        device->FmtType = stype;
        device->NumMonoSources = numMono;
        device->NumStereoSources = numStereo;
        device->NumAuxSends = numSends;
    }
    else if(attrList && attrList[0])
    {
        ALCuint freq, numMono, numStereo, numSends;
        ALCuint attrIdx = 0;

        /* If a context is already running on the device, stop playback so the
         * device attributes can be updated. */
        if((device->Flags&DEVICE_RUNNING))
            V0(device->Backend,stop)();
        device->Flags &= ~DEVICE_RUNNING;

        freq = device->Frequency;
        numMono = device->NumMonoSources;
        numStereo = device->NumStereoSources;
        numSends = device->NumAuxSends;

        while(attrList[attrIdx])
        {
            if(attrList[attrIdx] == ALC_FREQUENCY)
            {
                freq = attrList[attrIdx + 1];
                device->Flags |= DEVICE_FREQUENCY_REQUEST;
            }

            if(attrList[attrIdx] == ALC_STEREO_SOURCES)…