/*
** i_sound.cpp
** System interface for sound; uses fmod.dll
**
**---------------------------------------------------------------------------
** Copyright 1998-2008 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

// HEADER FILES ------------------------------------------------------------

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>
#include "resource.h"
extern HWND Window;
#define USE_WINDOWS_DWORD
#else
#define FALSE 0
#define TRUE 1
#endif

#include "templates.h"
#include "fmodsound.h"
#include "c_cvars.h"
#include "i_system.h"
#include "gi.h"
#include "actor.h"
#include "r_state.h"
#include "w_wad.h"
#include "i_music.h"
#include "i_musicinterns.h"
#include "v_text.h"

// MACROS ------------------------------------------------------------------

// killough 2/21/98: optionally use varying pitched sounds
#define PITCH(freq,pitch) (snd_pitched ? ((freq)*(pitch))/128.f : float(freq))

// Just some extra for music and whatever
#define NUM_EXTRA_SOFTWARE_CHANNELS		1

#define FIXED2FLOAT(x)				((x)/65536.f)

#define MAX_CHANNELS				256

#define ERRCHECK(x)


// TYPES -------------------------------------------------------------------

struct FEnumList
{
	const char *Name;
	int Value;
};

// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------

FMOD_RESULT SPC_CreateCodec(FMOD::System *sys);

// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------

// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------

static int Enum_NumForName(const FEnumList *list, const char *name);
static const char *Enum_NameForNum(const FEnumList *list, int num);

// EXTERNAL DATA DECLARATIONS ----------------------------------------------

EXTERN_CVAR (String, snd_output)
EXTERN_CVAR (Float, snd_musicvolume)
EXTERN_CVAR (Int, snd_buffersize)
EXTERN_CVAR (Int, snd_samplerate)
EXTERN_CVAR (Bool, snd_pitched)
EXTERN_CVAR (Int, snd_channels)

// PUBLIC DATA DEFINITIONS -------------------------------------------------

ReverbContainer *ForcedEnvironment;

CVAR (Int, snd_driver, 0, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR (Bool, snd_waterreverb, true, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR (String, snd_resampler, "Linear", CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR (String, snd_speakermode, "Auto", CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR (String, snd_output_format, "PCM-16", CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
CVAR (Bool, snd_dspnet, false, 0)

// PRIVATE DATA DEFINITIONS ------------------------------------------------

static const ReverbContainer *PrevEnvironment;

// The rolloff callback is called during FMOD::Sound::play, so we need this
// global variable to contain the sound info during that time for the
// callback.
static sfxinfo_t *GSfxInfo;
static float GDistScale;

// In the below lists, duplicate entries are for user selection. When
// queried, only the first one for the particular value is shown.
static const FEnumList OutputNames[] =
{
	{ "Auto",					FMOD_OUTPUTTYPE_AUTODETECT },
	{ "Default",				FMOD_OUTPUTTYPE_AUTODETECT },
	{ "No sound",				FMOD_OUTPUTTYPE_NOSOUND },

	// Windows
	{ "DirectSound",			FMOD_OUTPUTTYPE_DSOUND },
	{ "DSound",					FMOD_OUTPUTTYPE_DSOUND },
	{ "Windows Multimedia",		FMOD_OUTPUTTYPE_WINMM },
	{ "WinMM",					FMOD_OUTPUTTYPE_WINMM },
	{ "WaveOut",				FMOD_OUTPUTTYPE_WINMM },
	{ "OpenAL",					FMOD_OUTPUTTYPE_OPENAL },
	{ "WASAPI",					FMOD_OUTPUTTYPE_WASAPI },
	{ "ASIO",					FMOD_OUTPUTTYPE_ASIO },

	// Linux
	{ "OSS",					FMOD_OUTPUTTYPE_OSS },
	{ "ALSA",					FMOD_OUTPUTTYPE_ALSA },
	{ "ESD",					FMOD_OUTPUTTYPE_ESD },

	// Mac
	{ "Sound Manager",			FMOD_OUTPUTTYPE_SOUNDMANAGER },
	{ "Core Audio",				FMOD_OUTPUTTYPE_COREAUDIO },

	{ NULL, 0 }
};

static const FEnumList SpeakerModeNames[] =
{
	{ "Mono",					FMOD_SPEAKERMODE_MONO },
	{ "Stereo",					FMOD_SPEAKERMODE_STEREO },
	{ "Quad",					FMOD_SPEAKERMODE_QUAD },
	{ "Surround",				FMOD_SPEAKERMODE_SURROUND },
	{ "5.1",					FMOD_SPEAKERMODE_5POINT1 },
	{ "7.1",					FMOD_SPEAKERMODE_7POINT1 },
	{ "Prologic",				FMOD_SPEAKERMODE_PROLOGIC },
	{ "1",						FMOD_SPEAKERMODE_MONO },
	{ "2",						FMOD_SPEAKERMODE_STEREO },
	{ "4",						FMOD_SPEAKERMODE_QUAD },
	{ "Headphones",				9001 },
	{ "HRTF",					9001 },
	{ NULL, 0 }
};

static const FEnumList ResamplerNames[] =
{
	{ "No Interpolation",		FMOD_DSP_RESAMPLER_NOINTERP },
	{ "NoInterp",				FMOD_DSP_RESAMPLER_NOINTERP },
	{ "Linear",					FMOD_DSP_RESAMPLER_LINEAR },
	{ "Cubic",					FMOD_DSP_RESAMPLER_CUBIC },
	{ "Spline",					FMOD_DSP_RESAMPLER_SPLINE },
	{ NULL, 0 }
};

static const FEnumList SoundFormatNames[] =
{
	{ "None",					FMOD_SOUND_FORMAT_NONE },
	{ "PCM-8",					FMOD_SOUND_FORMAT_PCM8 },
	{ "PCM-16",					FMOD_SOUND_FORMAT_PCM16 },
	{ "PCM-24",					FMOD_SOUND_FORMAT_PCM24 },
	{ "PCM-32",					FMOD_SOUND_FORMAT_PCM32 },
	{ "PCM-Float",				FMOD_SOUND_FORMAT_PCMFLOAT },
	{ "GCADPCM",				FMOD_SOUND_FORMAT_GCADPCM },
	{ "IMAADPCM",				FMOD_SOUND_FORMAT_IMAADPCM },
	{ "VAG",					FMOD_SOUND_FORMAT_VAG },
	{ "XMA",					FMOD_SOUND_FORMAT_XMA },
	{ "MPEG",					FMOD_SOUND_FORMAT_MPEG },
	{ NULL, 0 }
};

// CODE --------------------------------------------------------------------

//==========================================================================
//
// Enum_NumForName
//
// Returns the value of an enum name, or -1 if not found.
//
//==========================================================================

static int Enum_NumForName(const FEnumList *list, const char *name)
{
	while (list->Name != NULL)
	{
		if (stricmp(list->Name, name) == 0)
		{
			return list->Value;
		}
		list++;
	}
	return -1;
}

//==========================================================================
//
// Enum_NameForNum
//
// Returns the name of an enum value. If there is more than one name for a
// value, on the first one in the list is returned. Returns NULL if there
// was no match.
//
//==========================================================================

static const char *Enum_NameForNum(const FEnumList *list, int num)
{
	while (list->Name != NULL)
	{
		if (list->Value == num)
		{
			return list->Name;
		}
		list++;
	}
	return NULL;
}

//==========================================================================
//
// The container for a FSOUND_STREAM.
//
//==========================================================================

class FMODStreamCapsule : public SoundStream
{
public:
	FMODStreamCapsule(FMOD::Sound *stream, FMODSoundRenderer *owner)
		: Owner(owner), Stream(NULL), Channel(NULL), DSP(NULL),
		  UserData(NULL), Callback(NULL)
	{
		SetStream(stream);
	}

	FMODStreamCapsule(void *udata, SoundStreamCallback callback, FMODSoundRenderer *owner)
		: Owner(owner), Stream(NULL), Channel(NULL), DSP(NULL),
		  UserData(udata), Callback(callback)
	{}

	~FMODStreamCapsule()
	{
		if (Stream != NULL)
		{
			Stream->release();
		}
	}

	void SetStream(FMOD::Sound *stream)
	{
		float frequency;

		Stream = stream;

		// As this interface is for music, make it super-high priority.
		if (FMOD_OK == stream->getDefaults(&frequency, NULL, NULL, NULL))
		{
			stream->setDefaults(frequency, 1, 0, 0);
		}
	}

	bool Play(bool looping, float volume, bool normalize)
	{
		FMOD_RESULT result;

		Stream->setMode(looping ? FMOD_LOOP_NORMAL : FMOD_LOOP_OFF);
		result = Owner->Sys->playSound(FMOD_CHANNEL_FREE, Stream, true, &Channel);
		if (result != FMOD_OK)
		{
			return false;
		}
		Channel->setChannelGroup(Owner->MusicGroup);
		Channel->setSpeakerMix(1, 1, 1, 1, 1, 1, 1, 1);
		Channel->setVolume(volume);
		// Ensure reverb is disabled.
		FMOD_REVERB_CHANNELPROPERTIES reverb;
		if (FMOD_OK == Channel->getReverbProperties(&reverb))
		{
			reverb.Room = -10000;
			Channel->setReverbProperties(&reverb);
		}
		if (normalize)
		{ // Attach a normalizer DSP unit to the channel.
			result = Owner->Sys->createDSPByType(FMOD_DSP_TYPE_NORMALIZE, &DSP);
			if (result == FMOD_OK)
			{
				Channel->addDSP(DSP);
			}
		}
		Channel->setPaused(false);
		return true;
	}

	void Stop()
	{
		if (Channel != NULL)
		{
			Channel->stop();
			Channel = NULL;
		}
		if (DSP != NULL)
		{
			DSP->release();
			DSP = NULL;
		}
	}

	bool SetPaused(bool paused)
	{
		if (Channel != NULL)
		{
			return FMOD_OK == Channel->setPaused(paused);
		}
		return false;
	}

	unsigned int GetPosition()
	{
		unsigned int pos;

		if (Channel != NULL && FMOD_OK == Channel->getPosition(&pos, FMOD_TIMEUNIT_MS))
		{
			return pos;
		}
		return 0;
	}

	void SetVolume(float volume)
	{
		if (Channel != NULL)
		{
			Channel->setVolume(volume);
		}
	}

	// Sets the current order number for a MOD-type song, or the position in ms
	// for anything else.
	bool SetPosition(int pos)
	{
		FMOD_SOUND_TYPE type;

		if (FMOD_OK == Stream->getFormat(&type, NULL, NULL, NULL) &&
			(type == FMOD_SOUND_TYPE_IT ||
			 type == FMOD_SOUND_TYPE_MOD ||
			 type == FMOD_SOUND_TYPE_S3M ||
			 type == FMOD_SOUND_TYPE_XM))
		{
			return FMOD_OK == Channel->setPosition(pos, FMOD_TIMEUNIT_MODORDER);
		}
		return FMOD_OK == Channel->setPosition(pos, FMOD_TIMEUNIT_MS);
	}

	static FMOD_RESULT F_CALLBACK PCMReadCallback(FMOD_SOUND *sound, void *data, unsigned int datalen)
	{
		FMOD_RESULT result;
		FMODStreamCapsule *self;
		
		result = ((FMOD::Sound *)sound)->getUserData((void **)&self);
		if (result != FMOD_OK || self == NULL || self->Callback == NULL)
		{
			return FMOD_ERR_INVALID_PARAM;
		}
		if (self->Callback(self, data, datalen, self->UserData))
		{
			return FMOD_OK;
		}
		else
		{
			return FMOD_ERR_FILE_EOF;
		}
	}

	static FMOD_RESULT F_CALLBACK PCMSetPosCallback(FMOD_SOUND *sound, int subsound, unsigned int position, FMOD_TIMEUNIT postype)
	{
		// This is useful if the user calls Channel::setPosition and you want
		// to seek your data accordingly.
		return FMOD_OK;
	}

private:
	FMODSoundRenderer *Owner;
	FMOD::Sound *Stream;
	FMOD::Channel *Channel;
	FMOD::DSP *DSP;
	void *UserData;
	SoundStreamCallback Callback;
};

//==========================================================================
//
// The interface the game uses to talk to FMOD.
//
//==========================================================================

FMODSoundRenderer::FMODSoundRenderer()
{
	InitSuccess = Init();
}

FMODSoundRenderer::~FMODSoundRenderer()
{
	Shutdown();
}

bool FMODSoundRenderer::IsValid()
{
	return InitSuccess;
}

//==========================================================================
//
// FMODSoundRenderer :: Init
//
//==========================================================================

bool FMODSoundRenderer::Init()
{
	FMOD_RESULT result;
	unsigned int version;
	FMOD_SPEAKERMODE speakermode;
	FMOD_SOUND_FORMAT format;
	FMOD_DSP_RESAMPLER resampler;
	FMOD_INITFLAGS initflags;

	int eval;

	SFXPaused = false;
	MusicGroup = NULL;
	SfxGroup = NULL;
	PausableSfx = NULL;
	PrevEnvironment = DefaultEnvironments[0];

	Printf ("I_InitSound: Initializing FMOD\n");

	// Create a System object and initialize.
	result = FMOD::System_Create(&Sys);
	ERRCHECK(result);

	result = Sys->getVersion(&version);
	ERRCHECK(result);

	if (version < FMOD_VERSION)
	{
		Printf (" "TEXTCOLOR_ORANGE"Error! You are using an old version of FMOD (%x.%02x.%02x).\n"
				" "TEXTCOLOR_ORANGE"This program requires version %x.%02x.%02x\n",
				version >> 16, (version >> 8) & 255, version & 255,
				FMOD_VERSION >> 16, (FMOD_VERSION >> 8) & 255, FMOD_VERSION & 255);
		return false;
	}

	result = Sys->getDriverCaps(0, &Driver_Caps, &Driver_MinFrequency, &Driver_MaxFrequency, &speakermode);
	ERRCHECK(result);

	// Set the user selected speaker mode.
	eval = Enum_NumForName(SpeakerModeNames, snd_speakermode);
	if (eval >= 0)
	{
		speakermode = FMOD_SPEAKERMODE(eval);
	}
	result = Sys->setSpeakerMode(speakermode < 9000 ? speakermode : FMOD_SPEAKERMODE_STEREO);
	ERRCHECK(result);

	// Set software format
	eval = Enum_NumForName(SoundFormatNames, snd_output_format);
	format = eval >= 0 ? FMOD_SOUND_FORMAT(eval) : FMOD_SOUND_FORMAT_PCM16;
	eval = Enum_NumForName(ResamplerNames, snd_resampler);
	resampler = eval >= 0 ? FMOD_DSP_RESAMPLER(eval) : FMOD_DSP_RESAMPLER_LINEAR;
	result = Sys->setSoftwareFormat(snd_samplerate, format, 0, 0, resampler);
	ERRCHECK(result);

	// Set software channels according to snd_channels
	result = Sys->setSoftwareChannels(snd_channels + NUM_EXTRA_SOFTWARE_CHANNELS);
	ERRCHECK(result);

#ifdef _WIN32
	if (OSPlatform == os_WinNT4)
	{
		// The following was true as of FMOD 3. I don't know if it still
		// applies to FMOD Ex, nor do I have an NT 4 install anymore, but
		// there's no reason to get rid of it yet.
		//
		// If running Windows NT 4, we need to initialize DirectSound before
		// using WinMM. If we don't, then FSOUND_Close will corrupt a
		// heap. This might just be the Audigy's drivers--I don't know why
		// it happens. At least the fix is simple enough. I only need to
		// initialize DirectSound once, and then I can initialize/close
		// WinMM as many times as I want.
		//
		// Yes, using WinMM under NT 4 is a good idea. I can get latencies as
		// low as 20 ms with WinMM, but with DirectSound I need to have the
		// latency as high as 120 ms to avoid crackling--quite the opposite
		// from the other Windows versions with real DirectSound support.

		static bool inited_dsound = false;

		if (!inited_dsound)
		{
			if (Sys->setOutput(FMOD_OUTPUTTYPE_DSOUND) == FMOD_OK)
			{
				if (Sys->init(1, FMOD_INIT_NORMAL, 0) == FMOD_OK)
				{
					inited_dsound = true;
					Sleep(50);
					Sys->close();
				}
				Sys->setOutput(FMOD_OUTPUTTYPE_WINMM);
			}
		}
	}
#endif

	// Set the user specified output mode.
	eval = Enum_NumForName(OutputNames, snd_output);
	if (eval >= 0)
	{
		result = Sys->setOutput(FMOD_OUTPUTTYPE(eval));
		ERRCHECK(result);
	}

	if (Driver_Caps & FMOD_CAPS_HARDWARE_EMULATED)
	{ // The user has the 'Acceleration' slider set to off!
	  // This is really bad for latency!
		Printf ("Warning: The sound acceleration slider has been set to off.\n");
		Printf ("Please turn it back on if you want decent sound.\n");
		result = Sys->setDSPBufferSize(1024, 10);	// At 48khz, the latency between issuing an fmod command and hearing it will now be about 213ms.
		ERRCHECK(result);
	}

	// Try to init
	initflags = FMOD_INIT_NORMAL;
	if (speakermode > 9000)
	{
		initflags |= FMOD_INIT_SOFTWARE_HRTF;
	}
	if (snd_dspnet)
	{
		initflags |= FMOD_INIT_ENABLE_DSPNET;
	}
	result = Sys->init(snd_channels + NUM_EXTRA_SOFTWARE_CHANNELS, initflags, 0);
	if (result == FMOD_ERR_OUTPUT_CREATEBUFFER)
	{ // The speaker mode selected isn't supported by this soundcard. Switch it back to stereo.
		result = Sys->setSpeakerMode(FMOD_SPEAKERMODE_STEREO);
		ERRCHECK(result);

		result = Sys->init(snd_channels + NUM_EXTRA_SOFTWARE_CHANNELS, initflags, 0);
		ERRCHECK(result);
	}
	if (result != FMOD_OK)
	{ // Initializing FMOD failed. Cry cry.
		return false;
	}

	// Create channel groups
	result = Sys->createChannelGroup("Music", &MusicGroup);
	ERRCHECK(result);

	result = Sys->createChannelGroup("SFX", &SfxGroup);
	ERRCHECK(result);

	result = Sys->createChannelGroup("Pausable SFX", &PausableSfx);
	ERRCHECK(result);

	result = SfxGroup->addGroup(PausableSfx);
	ERRCHECK(result);

	result = SPC_CreateCodec(Sys);

	Sys->set3DSettings(0.5f, 96.f, 1.f);
	Sys->set3DRolloffCallback(RolloffCallback);
	snd_sfxvolume.Callback ();
	return true;
}

//==========================================================================
//
// FMODSoundRenderer :: Shutdown
//
//==========================================================================

void FMODSoundRenderer::Shutdown()
{
	if (Sys != NULL)
	{
		unsigned int i;

		S_StopAllChannels();

		if (MusicGroup != NULL)
		{
			MusicGroup->release();
			MusicGroup = NULL;
		}
		if (PausableSfx != NULL)
		{
			PausableSfx->release();
			PausableSfx = NULL;
		}
		if (SfxGroup != NULL)
		{
			SfxGroup->release();
			SfxGroup = NULL;
		}

		// Free all loaded samples
		for (i = 0; i < S_sfx.Size(); i++)
		{
			if (S_sfx[i].data != NULL)
			{
				((FMOD::Sound *)S_sfx[i].data)->release();
				S_sfx[i].data = NULL;
			}
		}

		Sys->close();
		Sys = NULL;
	}
}

//==========================================================================
//
// FMODSoundRenderer :: PrintStatus
//
//==========================================================================

void FMODSoundRenderer::PrintStatus()
{
	FMOD_OUTPUTTYPE output;
	FMOD_SPEAKERMODE speakermode;
	FMOD_SOUND_FORMAT format;
	FMOD_DSP_RESAMPLER resampler;
	int driver;
	int samplerate;
	int numoutputchannels;
	int num2d, num3d, total;

	if (FMOD_OK == Sys->getOutput(&output))
	{
		Printf ("Output type: "TEXTCOLOR_GREEN"%s\n", Enum_NameForNum(OutputNames, output));
	}
	if (FMOD_OK == Sys->getSpeakerMode(&speakermode))
	{
		Printf ("Speaker mode: "TEXTCOLOR_GREEN"%s\n", Enum_NameForNum(SpeakerModeNames, speakermode));
	}
	if (FMOD_OK == Sys->getDriver(&driver))
	{
		char name[256];
		if (FMOD_OK != Sys->getDriverInfo(driver, name, sizeof(name), NULL))
		{
			strcpy(name, "Unknown");
		}
		Printf ("Driver: "TEXTCOLOR_GREEN"%d"TEXTCOLOR_NORMAL" ("TEXTCOLOR_ORANGE"%s"TEXTCOLOR_NORMAL")\n", driver, name);
		DumpDriverCaps(Driver_Caps, Driver_MinFrequency, Driver_MaxFrequency);
	}
	if (FMOD_OK == Sys->getHardwareChannels(&num2d, &num3d, &total))
	{
		Printf (TEXTCOLOR_YELLOW "Hardware 2D channels: "TEXTCOLOR_GREEN"%d\n", num2d);
		Printf (TEXTCOLOR_YELLOW "Hardware 3D channels: "TEXTCOLOR_GREEN"%d\n", num3d);
		Printf (TEXTCOLOR_YELLOW "Total hardware channels: "TEXTCOLOR_GREEN"%d\n", total);
	}
	if (FMOD_OK == Sys->getSoftwareFormat(&samplerate, &format, &numoutputchannels, NULL, &resampler, NULL))
	{
		Printf (TEXTCOLOR_LIGHTBLUE "Software mixer sample rate: "TEXTCOLOR_GREEN"%d\n", samplerate);
		Printf (TEXTCOLOR_LIGHTBLUE "Software mixer format: "TEXTCOLOR_GREEN"%s\n", Enum_NameForNum(SoundFormatNames, format));
		Printf (TEXTCOLOR_LIGHTBLUE "Software mixer channels: "TEXTCOLOR_GREEN"%d\n", numoutputchannels);
		Printf (TEXTCOLOR_LIGHTBLUE "Software mixer resampler: "TEXTCOLOR_GREEN"%s\n", Enum_NameForNum(ResamplerNames, resampler));
	}
}

//==========================================================================
//
// FMODSoundRenderer :: DumpDriverCaps
//
//==========================================================================

void FMODSoundRenderer::DumpDriverCaps(FMOD_CAPS caps, int minfrequency, int maxfrequency)
{
	Printf (TEXTCOLOR_OLIVE "   Min. frequency: "TEXTCOLOR_GREEN"%d\n", minfrequency);
	Printf (TEXTCOLOR_OLIVE "   Max. frequency: "TEXTCOLOR_GREEN"%d\n", maxfrequency);
	Printf ("  Features:\n");
	if (caps == 0)									Printf(TEXTCOLOR_OLIVE "   None\n");
	if (caps & FMOD_CAPS_HARDWARE)					Printf(TEXTCOLOR_OLIVE "   Hardware mixing\n");
	if (caps & FMOD_CAPS_HARDWARE_EMULATED)			Printf(TEXTCOLOR_OLIVE "   Hardware acceleration is turned off!\n");
	if (caps & FMOD_CAPS_OUTPUT_MULTICHANNEL)		Printf(TEXTCOLOR_OLIVE "   Multichannel\n");
	if (caps & FMOD_CAPS_OUTPUT_FORMAT_PCM8)		Printf(TEXTCOLOR_OLIVE "   PCM-8");
	if (caps & FMOD_CAPS_OUTPUT_FORMAT_PCM16)		Printf(TEXTCOLOR_OLIVE "   PCM-16");
	if (caps & FMOD_CAPS_OUTPUT_FORMAT_PCM24)		Printf(TEXTCOLOR_OLIVE "   PCM-24");
	if (caps & FMOD_CAPS_OUTPUT_FORMAT_PCM32)		Printf(TEXTCOLOR_OLIVE "   PCM-32");
	if (caps & FMOD_CAPS_OUTPUT_FORMAT_PCMFLOAT)	Printf(TEXTCOLOR_OLIVE "   PCM-Float");
	if (caps & (FMOD_CAPS_OUTPUT_FORMAT_PCM8 | FMOD_CAPS_OUTPUT_FORMAT_PCM16 | FMOD_CAPS_OUTPUT_FORMAT_PCM24 | FMOD_CAPS_OUTPUT_FORMAT_PCM32 | FMOD_CAPS_OUTPUT_FORMAT_PCMFLOAT))
	{
		Printf("\n");
	}
	if (caps & FMOD_CAPS_REVERB_EAX2)				Printf(TEXTCOLOR_OLIVE "   EAX2");
	if (caps & FMOD_CAPS_REVERB_EAX3)				Printf(TEXTCOLOR_OLIVE "   EAX3");
	if (caps & FMOD_CAPS_REVERB_EAX4)				Printf(TEXTCOLOR_OLIVE "   EAX4");
	if (caps & FMOD_CAPS_REVERB_EAX5)				Printf(TEXTCOLOR_OLIVE "   EAX5");
	if (caps & FMOD_CAPS_REVERB_I3DL2)				Printf(TEXTCOLOR_OLIVE "   I3DL2");
	if (caps & (FMOD_CAPS_REVERB_EAX2 | FMOD_CAPS_REVERB_EAX3 | FMOD_CAPS_REVERB_EAX4 | FMOD_CAPS_REVERB_EAX5 | FMOD_CAPS_REVERB_I3DL2))
	{
		Printf("\n");
	}
	if (caps & FMOD_CAPS_REVERB_LIMITED)			Printf("TEXTCOLOR_OLIVE    Limited reverb\n");
}

//==========================================================================
//
// FMODSoundRenderer :: PrintDriversList
//
//==========================================================================

void FMODSoundRenderer::PrintDriversList()
{
	int numdrivers;
	int i;
	char name[256];
	
	if (FMOD_OK == Sys->getNumDrivers(&numdrivers))
	{
		for (i = 0; i < numdrivers; ++i)
		{
			if (FMOD_OK == Sys->getDriverInfo(i, name, sizeof(name), NULL))
			{
				Printf("%d. %s\n", i, name);
			}
		}
	}
}

//==========================================================================
//
// FMODSoundRenderer :: GatherStats
//
//==========================================================================

FString FMODSoundRenderer::GatherStats()
{
	int channels;
	float dsp, stream, update, total;
	FString out;

	channels = 0;
	total = update = stream = dsp = 0;
	Sys->getChannelsPlaying(&channels);
	Sys->getCPUUsage(&dsp, &stream, &update, &total);

	out.Format ("%d channels,%5.2f%% CPU (%.2f%% DSP  %.2f%% Stream  %.2f%% Update)",
		channels, total, dsp, stream, update);
	return out;
}

//==========================================================================
//
// FMODSoundRenderer :: MovieDisableSound
//
//==========================================================================

void FMODSoundRenderer::MovieDisableSound()
{
	I_ShutdownMusic();
	Shutdown();
}

//==========================================================================
//
// FMODSoundRenderer :: MovieResumeSound
//
//==========================================================================

void FMODSoundRenderer::MovieResumeSound()
{
	Init();
	S_Init();
	S_RestartMusic();
}

//==========================================================================
//
// FMODSoundRenderer :: SetSfxVolume
//
//==========================================================================

void FMODSoundRenderer::SetSfxVolume(float volume)
{
	SfxGroup->setVolume(volume);
}

//==========================================================================
//
// FMODSoundRenderer :: SetMusicVolume
//
//==========================================================================

void FMODSoundRenderer::SetMusicVolume(float volume)
{
	MusicGroup->setVolume(volume);
}

//==========================================================================
//
// FMODSoundRenderer :: CreateStream
//
// Creates a streaming sound that receives PCM data through a callback.
//
//==========================================================================

SoundStream *FMODSoundRenderer::CreateStream (SoundStreamCallback callback, int buffbytes, int flags, int samplerate, void *userdata)
{
	FMODStreamCapsule *capsule;
	FMOD::Sound *sound;
	FMOD_RESULT result;
	FMOD_CREATESOUNDEXINFO exinfo = { sizeof(exinfo), };
	FMOD_MODE mode;
	int sample_shift;
	int channel_shift;
	
	capsule = new FMODStreamCapsule (userdata, callback, this);

	mode = FMOD_2D | FMOD_OPENUSER | FMOD_LOOP_NORMAL | FMOD_SOFTWARE | FMOD_CREATESTREAM;
	sample_shift = (flags & SoundStream::Bits8) ? 0 : 1;
	channel_shift = (flags & SoundStream::Mono) ? 0 : 1;

	// Chunk size of stream update in samples. This will be the amount of data
	// passed to the user callback.
	exinfo.decodebuffersize	 = buffbytes >> (sample_shift + channel_shift);

	// Number of channels in the sound.
	exinfo.numchannels		 = 1 << channel_shift;

	// Length of PCM data in bytes of whole song (for Sound::getLength).
	// This pretends it's 5 seconds long.
	exinfo.length			 = (samplerate * 5) << (sample_shift + channel_shift);

	// Default playback rate of sound. */
	exinfo.defaultfrequency	 = samplerate;

	// Data format of sound.
	exinfo.format			 = (flags & SoundStream::Bits8) ? FMOD_SOUND_FORMAT_PCM8 : FMOD_SOUND_FORMAT_PCM16;

	// User callback for reading.
	exinfo.pcmreadcallback	 = FMODStreamCapsule::PCMReadCallback;

	// User callback for seeking.
	exinfo.pcmsetposcallback = FMODStreamCapsule::PCMSetPosCallback;

	// User data to be attached to the sound during creation.  Access via Sound::getUserData.
	exinfo.userdata = capsule;

	result = Sys->createSound(NULL, mode, &exinfo, &sound);
	if (result != FMOD_OK)
	{
		delete capsule;
		return NULL;
	}
	capsule->SetStream(sound);
	return capsule;
}

//==========================================================================
//
// FMODSoundRenderer :: OpenStream
//
// Creates a streaming sound from a file on disk.
//
//==========================================================================

SoundStream *FMODSoundRenderer::OpenStream(const char *filename_or_data, int flags, int offset, int length)
{
	FMOD_MODE mode;
	FMOD_CREATESOUNDEXINFO exinfo = { sizeof(exinfo), };
	FMOD::Sound *stream;

	mode = FMOD_SOFTWARE | FMOD_2D | FMOD_CREATESTREAM;
	if (flags & SoundStream::Loop)
	{
		mode |= FMOD_LOOP_NORMAL;
	}
	if (offset == -1)
	{
		mode |= FMOD_OPENMEMORY;
		offset = 0;
	}
	exinfo.length = length;
	exinfo.fileoffset = offset;

	if (FMOD_OK == Sys->createSound(filename_or_data, mode, &exinfo, &stream))
	{
		return new FMODStreamCapsule(stream, this);
	}
	return NULL;
}

//==========================================================================
//
// FMODSoundRenderer :: StartSound
//
//==========================================================================

FSoundChan *FMODSoundRenderer::StartSound(sfxinfo_t *sfx, float vol, int pitch, bool looping, bool pausable)
{
	int id = int(sfx - &S_sfx[0]);
	FMOD_RESULT result;
	FMOD_MODE mode;
	FMOD::Channel *chan;
	float freq;

	freq = PITCH(sfx->frequency, pitch);

	GSfxInfo = sfx;
	result = Sys->playSound(FMOD_CHANNEL_FREE, (FMOD::Sound *)sfx->data, true, &chan);
	if (FMOD_OK == result)
	{
		result = chan->getMode(&mode);

		if (result != FMOD_OK)
		{
			assert(0);
			mode = FMOD_SOFTWARE;
		}
		mode = (mode & ~FMOD_3D) | FMOD_2D;
		if (looping)
		{
			mode = (mode & ~FMOD_LOOP_OFF) | FMOD_LOOP_NORMAL;
		}
		chan->setMode(mode);
		
		chan->setChannelGroup((pausable && !SFXPaused) ? PausableSfx : SfxGroup);
		chan->setFrequency(freq);
		chan->setVolume(vol);
		chan->setPaused(false);
		return CommonChannelSetup(chan, false);
	}

	DPrintf ("Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
	return 0;
}

//==========================================================================
//
// FMODSoundRenderer :: StartSound3D
//
//==========================================================================

FSoundChan *FMODSoundRenderer::StartSound3D(sfxinfo_t *sfx, float vol, float distscale,
	int pitch, int priority, bool looping, float pos[3], float vel[3], bool pausable)
{
	int id = int(sfx - &S_sfx[0]);
	FMOD_RESULT result;
	FMOD_MODE mode;
	FMOD::Channel *chan;
	float freq;
	float def_freq, def_vol, def_pan;
	int def_priority;

	freq = PITCH(sfx->frequency, pitch);

	// Change the sound's default priority before playing it.
	if (FMOD_OK == ((FMOD::Sound *)sfx->data)->getDefaults(&def_freq, &def_vol, &def_pan, &def_priority))
	{
		((FMOD::Sound *)sfx->data)->setDefaults(def_freq, def_vol, def_pan, clamp(def_priority - priority, 1, 256));
	}
	else
	{
		def_priority = -1;
	}

	// Play it.
	GSfxInfo = sfx;
	GDistScale = distscale;
	result = Sys->playSound(FMOD_CHANNEL_FREE, (FMOD::Sound *)sfx->data, true, &chan);

	// Then set the priority back.
	if (def_priority >= 0)
	{
		((FMOD::Sound *)sfx->data)->setDefaults(def_freq, def_vol, def_pan, def_priority);
	}

	if (FMOD_OK == result)
	{
		result = chan->getMode(&mode);
		if (result != FMOD_OK)
		{
			mode = FMOD_3D | FMOD_SOFTWARE;
		}
		if (looping)
		{
			mode = (mode & ~FMOD_LOOP_OFF) | FMOD_LOOP_NORMAL;
		}
		// If this sound is played at the same coordinates as the listener,
		// make it head relative.
		if (players[consoleplayer].camera != NULL)
		{
			float cpos[3];

			cpos[0] = FIXED2FLOAT(players[consoleplayer].camera->x);
			cpos[2] = FIXED2FLOAT(players[consoleplayer].camera->y);
			cpos[1] = FIXED2FLOAT(players[consoleplayer].camera->z);
			if (cpos[0] == pos[0] && cpos[1] == pos[1] && cpos[2] == pos[2])
			{
				mode = (mode & ~FMOD_3D_WORLDRELATIVE) | FMOD_3D_HEADRELATIVE;
				pos[0] = 0;
				pos[1] = 0;
				pos[2] = 0;
			}
		}
		chan->setMode(mode);
		chan->setChannelGroup((pausable && !SFXPaused) ? PausableSfx : SfxGroup);
		chan->setFrequency(freq);
		chan->setVolume(vol);
		chan->set3DAttributes((FMOD_VECTOR *)pos, (FMOD_VECTOR *)vel);
		chan->setPaused(false);
		FSoundChan *schan = CommonChannelSetup(chan, true);
		schan->DistanceScale = distscale;
		return schan;
	}

	DPrintf ("Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
	return 0;
}

//==========================================================================
//
// FMODSoundRenderer :: CommonChannelSetup
//
// Assign an end callback to the channel and allocates a game channel for
// it.
//
//==========================================================================

FSoundChan *FMODSoundRenderer::CommonChannelSetup(FMOD::Channel *chan, bool is3d)
{
	FSoundChan *schan = S_GetChannel(chan);
	chan->setUserData(schan);
	chan->setCallback(FMOD_CHANNEL_CALLBACKTYPE_END, ChannelEndCallback, 0);
	schan->Is3D = is3d;
	GSfxInfo = NULL;
	return schan;
}

//==========================================================================
//
// FMODSoundRenderer :: StopSound
//
//==========================================================================

void FMODSoundRenderer::StopSound(FSoundChan *chan)
{
	if (chan == NULL)
		return;

	if (chan->SysChannel != NULL)
	{
		((FMOD::Channel *)chan->SysChannel)->stop();
	}
}

//==========================================================================
//
// FMODSoundRenderer :: SetSfxPaused
//
//==========================================================================

void FMODSoundRenderer::SetSfxPaused(bool paused)
{
	if (SFXPaused != paused)
	{
		PausableSfx->setPaused(paused);
		SFXPaused = paused;
	}
}

//==========================================================================
//
// FMODSoundRenderer :: UpdateSoundParams3D
//
//==========================================================================

void FMODSoundRenderer::UpdateSoundParams3D(FSoundChan *chan, float pos[3], float vel[3])
{
	if (chan == NULL || chan->SysChannel == NULL)
		return;

	FMOD::Channel *fchan = (FMOD::Channel *)chan->SysChannel;

	// Sounds at the same location as the listener should be head relative, others
	// should be world relative.
	if (players[consoleplayer].camera != NULL)
	{
		FMOD_MODE oldmode, mode;
		float cpos[3];

		cpos[0] = FIXED2FLOAT(players[consoleplayer].camera->x);
		cpos[2] = FIXED2FLOAT(players[consoleplayer].camera->y);
		cpos[1] = FIXED2FLOAT(players[consoleplayer].camera->z);
		if (FMOD_OK != fchan->getMode(&oldmode))
		{
			oldmode = FMOD_3D | FMOD_SOFTWARE;
		}
		if (cpos[0] == pos[0] && cpos[1] == pos[1] && cpos[2] == pos[2])
		{
			mode = (oldmode & ~FMOD_3D_WORLDRELATIVE) | FMOD_3D_HEADRELATIVE;
			pos[0] = 0;
			pos[1] = 0;
			pos[2] = 0;
		}
		else
		{
			mode = (oldmode & ~FMOD_3D_HEADRELATIVE) | FMOD_3D_WORLDRELATIVE;
		}
		// Only set the mode if it changed.
		if (((mode ^ oldmode) & (FMOD_3D_WORLDRELATIVE | FMOD_3D_HEADRELATIVE)) == 0)
		{
			fchan->setMode(mode);
		}
	}

	fchan->set3DAttributes((FMOD_VECTOR *)pos, (FMOD_VECTOR *)vel);
}

//==========================================================================
//
// FMODSoundRenderer :: ResetEnvironment
//
//==========================================================================

void FMODSoundRenderer::ResetEnvironment()
{
	PrevEnvironment = NULL;
}

//==========================================================================
//
// FMODSoundRenderer :: UpdateListener
//
//==========================================================================

void FMODSoundRenderer::UpdateListener()
{
	AActor *listener = players[consoleplayer].camera;
	float angle;
	FMOD_VECTOR pos, vel;
	FMOD_VECTOR forward;
	FMOD_VECTOR up;

	if (listener == NULL)
	{
		return;
	}

	vel.x = listener->momx * (TICRATE/65536.f);
	vel.y = listener->momz * (TICRATE/65536.f);
	vel.z = listener->momy * (TICRATE/65536.f);
	pos.x = listener->x / 65536.f;
	pos.y = listener->z / 65536.f;
	pos.z = listener->y / 65536.f;

	angle = (float)(listener->angle) * ((float)PI / 2147483648.f);

	forward.x = cosf(angle);
	forward.y = 0;
	forward.z = sinf(angle);

	up.x = 0;
	up.y = 1;
	up.z = 0;

	Sys->set3DListenerAttributes(0, &pos, &vel, &forward, &up);

	bool underwater = false;
	const ReverbContainer *env;

	if (ForcedEnvironment)
	{
		env = ForcedEnvironment;
	}
	else
	{
		underwater = (listener->waterlevel == 3 && snd_waterreverb);
		assert (zones != NULL);
		env = zones[listener->Sector->ZoneNumber].Environment;
		if (env == NULL)
		{
			env = DefaultEnvironments[0];
		}
		if (env == DefaultEnvironments[0] && underwater)
		{
			env = DefaultEnvironments[22];
		}
	}
	if (env != PrevEnvironment || env->Modified)
	{
		DPrintf ("Reverb Environment %s\n", env->Name);
		const_cast<ReverbContainer*>(env)->Modified = false;
		Sys->setReverbProperties((FMOD_REVERB_PROPERTIES *)(&env->Properties));
		PausableSfx->setPitch(underwater ? 0.64171f : 1);
		PrevEnvironment = env;
	}
}

//==========================================================================
//
// FMODSoundRenderer :: UpdateSounds
//
//==========================================================================

void FMODSoundRenderer::UpdateSounds()
{
	Sys->update();
}

//==========================================================================
//
// FMODSoundRenderer :: LoadSound
//
//==========================================================================

void FMODSoundRenderer::LoadSound(sfxinfo_t *sfx)
{
	if (sfx->data == NULL)
	{
		DPrintf("loading sound \"%s\" (%d) ", sfx->name.GetChars(), sfx - &S_sfx[0]);
		getsfx(sfx);
	}
}

//==========================================================================
//
// FMODSoundRenderer :: UnloadSound
//
//==========================================================================

void FMODSoundRenderer::UnloadSound(sfxinfo_t *sfx)
{
	if (sfx->data != NULL)
	{
		((FMOD::Sound *)sfx->data)->release();
		sfx->data = NULL;
		DPrintf("Unloaded sound \"%s\" (%d)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
	}
}

//==========================================================================
//
// FMODSoundRenderer :: GetMSLength
//
//==========================================================================

unsigned int FMODSoundRenderer::GetMSLength(sfxinfo_t *sfx)
{
	if (sfx->data == NULL)
	{
		LoadSound(sfx);
	}
	if (sfx->data != NULL)
	{
		unsigned int length;

		if (((FMOD::Sound *)sfx->data)->getLength(&length, FMOD_TIMEUNIT_MS) == FMOD_OK)
		{
			return length;
		}
	}
	return 0;	// Don't know.
}

//==========================================================================
//
// FMODSoundRenderer :: DoLoad
//
//==========================================================================

void FMODSoundRenderer::DoLoad(void **slot, sfxinfo_t *sfx)
{
	BYTE *sfxdata;
	BYTE *sfxstart;
	int size;
	int errcount;
	FMOD_RESULT result;
	FMOD_MODE samplemode;
	FMOD_CREATESOUNDEXINFO exinfo = { sizeof(exinfo), };
	FMOD::Sound *sample;
	int rolloff;
	float mindist, maxdist;

	samplemode = FMOD_3D | FMOD_OPENMEMORY | FMOD_SOFTWARE;

	if (sfx->MaxDistance == 0)
	{
		mindist = S_MinDistance;
		maxdist = S_MaxDistanceOrRolloffFactor;
		rolloff = S_RolloffType;
	}
	else
	{
		mindist = sfx->MinDistance;
		maxdist = sfx->MaxDistance;
		rolloff = sfx->RolloffType;
	}

	sfxdata = NULL;

	errcount = 0;
	while (errcount < 2)
	{
		if (sfxdata != NULL)
		{
			delete[] sfxdata;
			sfxdata = NULL;
		}

		if (errcount)
			sfx->lumpnum = Wads.GetNumForName("dsempty", ns_sounds);

		size = Wads.LumpLength(sfx->lumpnum);
		if (size == 0)
		{
			errcount++;
			continue;
		}

		FWadLump wlump = Wads.OpenLumpNum(sfx->lumpnum);
		sfxstart = sfxdata = new BYTE[size];
		wlump.Read(sfxdata, size);
		SDWORD len = ((SDWORD *)sfxdata)[1];

		// If the sound is raw, just load it as such.
		// Otherwise, try the sound as DMX format.
		// If that fails, let FMOD try and figure it out.
		if (sfx->bLoadRAW ||
			(((BYTE *)sfxdata)[0] == 3 && ((BYTE *)sfxdata)[1] == 0 && len <= size - 8))
		{
			if (sfx->bLoadRAW)
			{
				len = Wads.LumpLength (sfx->lumpnum);
				sfx->frequency = (sfx->bForce22050 ? 22050 : 11025);
			}
			else
			{
				sfx->frequency = ((WORD *)sfxdata)[1];
				if (sfx->frequency == 0)
				{
					sfx->frequency = 11025;
				}
				sfxstart = sfxdata + 8;
			}

			exinfo.length = len;
			exinfo.numchannels = 1;
			exinfo.defaultfrequency = sfx->frequency;
			exinfo.format = FMOD_SOUND_FORMAT_PCM8;

			samplemode |= FMOD_OPENRAW;

			// Need to convert sample data from unsigned to signed.
			for (int i = 0; i < len; ++i)
			{
				sfxstart[i] = sfxstart[i] - 128;
			}
		}
		else
		{
			exinfo.length = size;
		}
		result = Sys->createSound((char *)sfxstart, samplemode, &exinfo, &sample);
		if (result == FMOD_ERR_OUTPUT_CREATEBUFFER && !(samplemode & FMOD_SOFTWARE))
		{
			DPrintf("Trying to fall back to software sample\n");
			samplemode = (samplemode & ~FMOD_HARDWARE) | FMOD_SOFTWARE;
			result = Sys->createSound((char *)sfxstart, samplemode, &exinfo, &sample);
		}
		if (result != FMOD_OK)
		{
			DPrintf("Failed to allocate sample: %d\n", result);
			errcount++;
			continue;
		}
		*slot = sample;
		// Get frequency and length for sounds FMOD handled for us.
		if (!(samplemode & FMOD_OPENRAW))
		{
			float freq;

			result = sample->getDefaults(&freq, NULL, NULL, NULL);
			if (result != FMOD_OK)
			{
				DPrintf("Failed getting default sound frequency, assuming 11025Hz\n");
				freq = 11025;
			}
			sfx->frequency = (unsigned int)freq;
		}
		break;
	}

	if (sample != NULL)
	{
		if (rolloff == ROLLOFF_Log)
		{
			maxdist = 10000.f;
		}
		sample->set3DMinMaxDistance(mindist, maxdist);
		sample->setUserData(sfx);
	}

	if (sfxdata != NULL)
	{
		delete[] sfxdata;
	}
}

//==========================================================================
//
// FMODSoundRenderer :: getsfx
//
// Get the sound data from the WAD and register it with sound library
//
//==========================================================================

void FMODSoundRenderer::getsfx(sfxinfo_t *sfx)
{
	unsigned int i;

	// If the sound doesn't exist, replace it with the empty sound.
	if (sfx->lumpnum == -1)
	{
		sfx->lumpnum = Wads.GetNumForName("dsempty", ns_sounds);
	}
	
	// See if there is another sound already initialized with this lump. If so,
	// then set this one up as a link, and don't load the sound again.
	for (i = 0; i < S_sfx.Size(); i++)
	{
		if (S_sfx[i].data && S_sfx[i].link == sfxinfo_t::NO_LINK && S_sfx[i].lumpnum == sfx->lumpnum)
		{
			DPrintf ("Linked to %s (%d)\n", S_sfx[i].name.GetChars(), i);
			sfx->link = i;
			return;
		}
	}
	DoLoad(&sfx->data, sfx);
}

//==========================================================================
//
// FMODSoundRenderer :: ChannelEndCallback							static
//
// Called when the channel finishes playing.
//
//==========================================================================

FMOD_RESULT F_CALLBACK FMODSoundRenderer::ChannelEndCallback
	(FMOD_CHANNEL *channel, FMOD_CHANNEL_CALLBACKTYPE type,
	 int cmd, unsigned int data1, unsigned int data2)
{
	assert(type == FMOD_CHANNEL_CALLBACKTYPE_END);
	FMOD::Channel *chan = (FMOD::Channel *)channel;
	FSoundChan *schan;

	if (chan->getUserData((void **)&schan) == FMOD_OK && schan != NULL)
	{
		S_ReturnChannel(schan);
	}
	return FMOD_OK;
}


//==========================================================================
//
// FMODSoundRenderer :: RolloffCallback								static
//
// Calculates a volume for the sound based on distance.
//
//==========================================================================

float F_CALLBACK FMODSoundRenderer::RolloffCallback(FMOD_CHANNEL *channel, float distance)
{
	FMOD::Channel *chan = (FMOD::Channel *)channel;
	FSoundChan *schan;
	// Defaults for Doom.
	int type = ROLLOFF_Doom;
	sfxinfo_t *sfx;
	float min;
	float max;
	float factor;
	float volume;

	type = S_RolloffType;
	factor = S_MaxDistanceOrRolloffFactor;
	min = S_MinDistance;
	max = S_MaxDistanceOrRolloffFactor;

	if (GSfxInfo != NULL)
	{
		sfx = GSfxInfo;
		distance *= GDistScale;
	}
	else if (chan->getUserData((void **)&schan) == FMOD_OK && schan != NULL)
	{
		sfx = schan->SfxInfo;
		distance *= schan->DistanceScale;
	}
	else
	{
		return 0;
	}
	if (sfx == NULL)
	{
		return 0;
	}

	if (sfx->MaxDistance == 0)
	{
		type = sfx->RolloffType;
		factor = sfx->RolloffFactor;
	}
	chan->get3DMinMaxDistance(&min, &max);

	if (distance <= min)
	{
		return 1;
	}
	if (type == ROLLOFF_Log)
	{ // Logarithmic rolloff has no max distance where it goes silent.
		return min / (min + factor * (distance - min));
	}
	if (distance >= max)
	{
		return 0;
	}
	volume = (max - distance) / (max - min);
	if (type == ROLLOFF_Custom && S_SoundCurve != NULL)
	{
		volume = S_SoundCurve[int(S_SoundCurveSize * (1 - volume))] / 127.f;
	}
	if (type == ROLLOFF_Linear)
	{
		return volume;
	}
	else
	{
		return (powf(10.f, volume) - 1.f) / 9.f;
	}
}