(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uSound;

(*

 * This unit controls the sounds and music of the game.

 * Doesn't really do anything if isSoundEnabled = false and isMusicEnabled = false

 *

 * There are three basic types of sound controls:

 *    Music        - The background music of the game:

 *                   * will only be played if isMusicEnabled = true

 *                   * can be started, changed, paused and resumed

 *    Sound        - Can be started and stopped

 *    Looped Sound - Subtype of sound: plays in a loop using a

 *                   "channel", of which the id is returned on start.

 *                   The channel id can be used to stop a specific sound loop.

 *)

interface

uses SDLh, uConsts, uTypes;

procedure preInitModule;

procedure initModule;

procedure freeModule;

procedure InitSound;                            // Initiates sound-system if isSoundEnabled.

procedure ReleaseSound(complete: boolean);      // Releases sound-system and used resources.

procedure ResetSound;                           // Reset sound state to the previous state.

procedure SetSound(enabled: boolean);           // Enable/disable sound-system and backup status.

procedure SetAudioDampen(enabled: boolean);     // Enable/disable automatic dampening if losing window focus.

// MUSIC

// Obvious music commands for music track

procedure SetMusic(enabled: boolean);           // Enable/disable music.

procedure SetMusicName(musicname: shortstring); // Set name of the file to play.

procedure PlayMusic;                            // Play music from the start.

procedure PauseMusic;                           // Pause music.

procedure ResumeMusic;                          // Resume music from pause point.

procedure ChangeMusic(musicname: shortstring);  // Replaces music track with musicname and plays it.

procedure StopMusic;                            // Stops and releases the current track.

// SOUNDS

// Plays the sound snd [from a given voicepack],

// if keepPlaying is given and true,

// then the sound's playback won't be interrupted if asked to play again.

procedure PlaySound(snd: TSound);

procedure PlaySound(snd: TSound; keepPlaying: boolean);

procedure PlaySound(snd: TSound; keepPlaying: boolean; ignoreMask: boolean);

procedure PlaySound(snd: TSound; keepPlaying, ignoreMask, soundAsMusic: boolean);

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack);

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack; keepPlaying: boolean);

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack; keepPlaying, ignoreMask: boolean);

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack; keepPlaying, ignoreMask, soundAsMusic: boolean);

// Plays/stops a sound to replace the main background music temporarily.

procedure PlayMusicSound(snd: TSound);

procedure StopMusicSound(snd: TSound);

// Plays sound snd [of voicepack] in a loop, but starts with fadems milliseconds of fade-in.

// Returns sound channel of the looped sound.

function  LoopSound(snd: TSound): LongInt;

function  LoopSound(snd: TSound; fadems: LongInt): LongInt;

function  LoopSoundV(snd: TSound; voicepack: PVoicepack): LongInt;

function  LoopSoundV(snd: TSound; voicepack: PVoicepack; fadems: LongInt): LongInt;

// Stops the normal/looped sound of the given type/in the given channel

// [with a fade-out effect for fadems milliseconds].

procedure StopSound(snd: TSound);

procedure StopSound(snd: TSound; soundAsMusic: boolean);

procedure StopSoundChan(chn: LongInt);

procedure StopSoundChan(chn, fadems: LongInt);

procedure AddVoice(snd: TSound; voicepack: PVoicepack);

procedure AddVoice(snd: TSound; voicepack: PVoicepack; ignoreMask: boolean);

procedure PlayNextVoice;

// GLOBAL FUNCTIONS

// Drastically lower the volume when we lose focus (and restore the previous value).

procedure DampenAudio;

procedure UndampenAudio;

// Mute/Unmute audio

procedure MuteAudio;

// MISC

// Set the initial volume

procedure SetVolume(vol: LongInt);

// Modifies the sound volume of the game by voldelta and returns the new volume level.

function  ChangeVolume(voldelta: LongInt): LongInt;

// Returns the current volume in percent

function  GetVolumePercent(): LongInt;

// Returns a pointer to the voicepack with the given name.

function  AskForVoicepack(name: shortstring): Pointer;

var MusicFN: shortstring; // music file name

    SDMusicFN: shortstring; // SD music file name

    FallbackMusicFN: shortstring; // fallback music file name

    FallbackSDMusicFN: shortstring; // fallback SD music fille name

var Volume: LongInt;

    SoundTimerTicks: Longword;

implementation

uses uVariables, uConsole, uCommands, uDebug, uPhysFSLayer;

const chanTPU = 32;

var cInitVolume: LongInt;

    previousVolume: LongInt; // cached volume value

    lastChan: array [TSound] of LongInt;

    voicepacks: array[0..cMaxTeams] of TVoicepack;

    defVoicepack: PVoicepack;

    Mus: PMixMusic; // music pointer

    isMusicEnabled: boolean;

    isSoundEnabled: boolean;

    isAutoDampening: boolean;

    isSEBackup: boolean;

    VoiceList : array[0..7] of TVoice =  (

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil),

                    ( snd: sndNone; voicepack: nil));

    Soundz: array[TSound] of record

            FileName: string[31];

            Path, AltPath    : TPathType;

            end = (

            (FileName:                         ''; Path: ptNone; AltPath: ptNone),// sndNone

            (FileName:        'grenadeimpact.ogg'; Path: ptSounds; AltPath: ptNone),// sndGrenadeImpact

            (FileName:            'explosion.ogg'; Path: ptSounds; AltPath: ptNone),// sndExplosion

            (FileName:         'throwpowerup.ogg'; Path: ptSounds; AltPath: ptNone),// sndThrowPowerUp

            (FileName:         'throwrelease.ogg'; Path: ptSounds; AltPath: ptNone),// sndThrowRelease

            (FileName:               'splash.ogg'; Path: ptCurrTheme; AltPath: ptSounds),// sndSplash

            (FileName:        'shotgunreload.ogg'; Path: ptSounds; AltPath: ptNone),// sndShotgunReload

            (FileName:          'shotgunfire.ogg'; Path: ptSounds; AltPath: ptNone),// sndShotgunFire

            (FileName:          'graveimpact.ogg'; Path: ptSounds; AltPath: ptNone),// sndGraveImpact

            (FileName:           'mineimpact.ogg'; Path: ptSounds; AltPath: ptNone),// sndMineImpact

            (FileName:             'minetick.ogg'; Path: ptSounds; AltPath: ptNone),// sndMineTicks

            // TODO: New mudball sound?

            (FileName:             'Droplet1.ogg'; Path: ptSounds; AltPath: ptNone),// sndMudballImpact

            (FileName:           'pickhammer.ogg'; Path: ptSounds; AltPath: ptNone),// sndPickhammer

            (FileName:                  'gun.ogg'; Path: ptSounds; AltPath: ptNone),// sndGun

            (FileName:                  'bee.ogg'; Path: ptSounds; AltPath: ptNone),// sndBee

            (FileName:                'Jump1.ogg'; Path: ptVoices; AltPath: ptNone),// sndJump1

            (FileName:                'Jump2.ogg'; Path: ptVoices; AltPath: ptNone),// sndJump2

            (FileName:                'Jump3.ogg'; Path: ptVoices; AltPath: ptNone),// sndJump3

            (FileName:               'Yessir.ogg'; Path: ptVoices; AltPath: ptNone),// sndYesSir

            (FileName:                'Laugh.ogg'; Path: ptVoices; AltPath: ptNone),// sndLaugh

            (FileName:            'Illgetyou.ogg'; Path: ptVoices; AltPath: ptNone),// sndIllGetYou

            (FileName:          'Justyouwait.ogg'; Path: ptVoices; AltPath: ptNone),// sndJustyouwait

            (FileName:             'Incoming.ogg'; Path: ptVoices; AltPath: ptNone),// sndIncoming

            (FileName:               'Missed.ogg'; Path: ptVoices; AltPath: ptNone),// sndMissed

            (FileName:               'Stupid.ogg'; Path: ptVoices; AltPath: ptNone),// sndStupid

            (FileName:           'Firstblood.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirstBlood

            (FileName:               'Boring.ogg'; Path: ptVoices; AltPath: ptNone),// sndBoring

            (FileName:               'Byebye.ogg'; Path: ptVoices; AltPath: ptNone),// sndByeBye

            (FileName:             'Sameteam.ogg'; Path: ptVoices; AltPath: ptNone),// sndSameTeam

            (FileName:               'Nutter.ogg'; Path: ptVoices; AltPath: ptNone),// sndNutter

            (FileName:       'Reinforcements.ogg'; Path: ptVoices; AltPath: ptNone),// sndReinforce

            (FileName:              'Traitor.ogg'; Path: ptVoices; AltPath: ptNone),// sndTraitor

            (FileName:      'Youllregretthat.ogg'; Path: ptVoices; AltPath: ptNone),// sndRegret

            (FileName:            'Enemydown.ogg'; Path: ptVoices; AltPath: ptNone),// sndEnemyDown

            (FileName:               'Coward.ogg'; Path: ptVoices; AltPath: ptNone),// sndCoward

            (FileName:                'Hurry.ogg'; Path: ptVoices; AltPath: ptNone),// sndHurry

            (FileName:              'Watchit.ogg'; Path: ptVoices; AltPath: ptNone),// sndWatchIt

            (FileName:             'Kamikaze.ogg'; Path: ptVoices; AltPath: ptNone),// sndKamikaze

            (FileName:                'cake2.ogg'; Path: ptSounds; AltPath: ptNone),// sndCake

            (FileName:                  'Ow1.ogg'; Path: ptVoices; AltPath: ptNone),// sndOw1

            (FileName:                  'Ow2.ogg'; Path: ptVoices; AltPath: ptNone),// sndOw2

            (FileName:                  'Ow3.ogg'; Path: ptVoices; AltPath: ptNone),// sndOw3

            (FileName:                  'Ow4.ogg'; Path: ptVoices; AltPath: ptNone),// sndOw4

            (FileName:           'Firepunch1.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch1

            (FileName:           'Firepunch2.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch2

            (FileName:           'Firepunch3.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch3

            (FileName:           'Firepunch4.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch4

            (FileName:           'Firepunch5.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch5

            (FileName:           'Firepunch6.ogg'; Path: ptVoices; AltPath: ptNone),// sndFirePunch6

            (FileName:                'Melon.ogg'; Path: ptVoices; AltPath: ptNone),// sndMelon

            (FileName:              'Hellish.ogg'; Path: ptSounds; AltPath: ptNone),// sndHellish

            (FileName:               'Yoohoo.ogg'; Path: ptSounds; AltPath: ptNone),// sndYoohoo

            (FileName:              'rcplane.ogg'; Path: ptSounds; AltPath: ptNone),// sndRCPlane

            (FileName:            'whipcrack.ogg'; Path: ptSounds; AltPath: ptNone),// sndWhipCrack

            (FileName:'ride_of_the_valkyries.ogg'; Path: ptSounds; AltPath: ptNone),// sndRideOfTheValkyries

            (FileName:               'denied.ogg'; Path: ptSounds; AltPath: ptNone),// sndDenied

            (FileName:               'placed.ogg'; Path: ptSounds; AltPath: ptNone),// sndPlaced

            (FileName:          'baseballbat.ogg'; Path: ptSounds; AltPath: ptNone),// sndBaseballBat

            (FileName:                'steam.ogg'; Path: ptSounds; AltPath: ptNone),// sndVaporize

            (FileName:                 'warp.ogg'; Path: ptSounds; AltPath: ptNone),// sndWarp

            (FileName:          'suddendeath.ogg'; Path: ptSounds; AltPath: ptNone),// sndSuddenDeath

            (FileName:               'mortar.ogg'; Path: ptSounds; AltPath: ptNone),// sndMortar

            (FileName:         'shutterclick.ogg'; Path: ptSounds; AltPath: ptNone),// sndShutter

            (FileName:              'homerun.ogg'; Path: ptSounds; AltPath: ptNone),// sndHomerun

            (FileName:              'molotov.ogg'; Path: ptSounds; AltPath: ptNone),// sndMolotov

            (FileName:            'Takecover.ogg'; Path: ptVoices; AltPath: ptNone),// sndCover

            (FileName:                'Uh-oh.ogg'; Path: ptVoices; AltPath: ptNone),// sndUhOh

            (FileName:                 'Oops.ogg'; Path: ptVoices; AltPath: ptNone),// sndOops

            (FileName:                 'Nooo.ogg'; Path: ptVoices; AltPath: ptNone),// sndNooo

            (FileName:                'Hello.ogg'; Path: ptVoices; AltPath: ptNone),// sndHello

            (FileName:             'ropeshot.ogg'; Path: ptSounds; AltPath: ptNone),// sndRopeShot

            (FileName:           'ropeattach.ogg'; Path: ptSounds; AltPath: ptNone),// sndRopeAttach

            (FileName:          'roperelease.ogg'; Path: ptSounds; AltPath: ptNone),// sndRopeRelease

            (FileName:            'switchhog.ogg'; Path: ptSounds; AltPath: ptNone),// sndSwitchHog

            (FileName:              'Victory.ogg'; Path: ptVoices; AltPath: ptNone),// sndVictory

            (FileName:             'Flawless.ogg'; Path: ptVoices; AltPath: ptNone),// sndFlawless

            (FileName:         'sniperreload.ogg'; Path: ptSounds; AltPath: ptNone),// sndSniperReload

            (FileName:                'steps.ogg'; Path: ptSounds; AltPath: ptNone),// sndSteps

            (FileName:           'lowgravity.ogg'; Path: ptSounds; AltPath: ptNone),// sndLowGravity

            (FileName:           'hell_growl.ogg'; Path: ptSounds; AltPath: ptNone),// sndHellishImpact1

            (FileName:            'hell_ooff.ogg'; Path: ptSounds; AltPath: ptNone),// sndHellishImpact2

            (FileName:              'hell_ow.ogg'; Path: ptSounds; AltPath: ptNone),// sndHellishImpact3

            (FileName:             'hell_ugh.ogg'; Path: ptSounds; AltPath: ptNone),// sndHellishImpact4

            (FileName:          'melonimpact.ogg'; Path: ptSounds; AltPath: ptNone),// sndMelonImpact

            (FileName:             'Droplet1.ogg'; Path: ptCurrTheme; AltPath: ptSounds),// sndDroplet1

            (FileName:             'Droplet2.ogg'; Path: ptCurrTheme; AltPath: ptSounds),// sndDroplet2

            (FileName:             'Droplet3.ogg'; Path: ptCurrTheme; AltPath: ptSounds),// sndDroplet3

            (FileName:                  'egg.ogg'; Path: ptSounds; AltPath: ptNone),// sndEggBreak

            (FileName:             'drillgun.ogg'; Path: ptSounds; AltPath: ptNone),// sndDrillRocket

            (FileName:          'PoisonCough.ogg'; Path: ptVoices; AltPath: ptNone),// sndPoisonCough

            (FileName:           'PoisonMoan.ogg'; Path: ptVoices; AltPath: ptNone),// sndPoisonMoan

            (FileName:             'BirdyLay.ogg'; Path: ptSounds; AltPath: ptNone),// sndBirdyLay

            (FileName:              'Whistle.ogg'; Path: ptSounds; AltPath: ptNone),// sndWhistle

            (FileName:             'beewater.ogg'; Path: ptSounds; AltPath: ptNone),// sndBeeWater

            (FileName:                   '1C.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano0

            (FileName:                   '2D.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano1

            (FileName:                   '3E.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano2

            (FileName:                   '4F.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano3

            (FileName:                   '5G.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano4

            (FileName:                   '6A.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano5

            (FileName:                   '7B.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano6

            (FileName:                   '8C.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano7

            (FileName:                   '9D.ogg'; Path: ptSounds; AltPath: ptNone),// sndPiano8

            (FileName:                 'skip.ogg'; Path: ptCurrTheme; AltPath: ptSounds),// sndSkip

            (FileName:              'sinegun.ogg'; Path: ptSounds; AltPath: ptNone),// sndSineGun

            (FileName:                'Ooff1.ogg'; Path: ptVoices; AltPath: ptNone),// sndOoff1

            (FileName:                'Ooff2.ogg'; Path: ptVoices; AltPath: ptNone),// sndOoff2

            (FileName:                'Ooff3.ogg'; Path: ptVoices; AltPath: ptNone),// sndOoff3

            (FileName:               'hammer.ogg'; Path: ptSounds; AltPath: ptNone),// sndWhack

            (FileName:           'Comeonthen.ogg'; Path: ptVoices; AltPath: ptNone),// sndComeonthen

            (FileName:            'parachute.ogg'; Path: ptSounds; AltPath: ptNone),// sndParachute

            (FileName:                 'bump.ogg'; Path: ptSounds; AltPath: ptNone),// sndBump

            (FileName:            'hogchant3.ogg'; Path: ptSounds; AltPath: ptNone),// sndResurrector

            (FileName:                'plane.ogg'; Path: ptSounds; AltPath: ptNone),// sndPlane

            (FileName:               'TARDIS.ogg'; Path: ptSounds; AltPath: ptNone),// sndTardis

            (FileName:    'frozen_hog_impact.ogg'; Path: ptSounds; AltPath: ptNone),// sndFrozenHogImpact

            (FileName:             'ice_beam.ogg'; Path: ptSounds; AltPath: ptNone),// sndIceBeam

            (FileName:           'hog_freeze.ogg'; Path: ptSounds; AltPath: ptNone), // sndHogFreeze

            (FileName:       'airmine_impact.ogg'; Path: ptSounds; AltPath: ptNone),// sndAirMineImpact

            (FileName:         'knife_impact.ogg'; Path: ptSounds; AltPath: ptNone),// sndKnifeImpact

            (FileName:            'extratime.ogg'; Path: ptSounds; AltPath: ptNone),// sndExtraTime

            (FileName:           'lasersight.ogg'; Path: ptSounds; AltPath: ptNone),// sndLaserSight

            (FileName:         'invulnerable.ogg'; Path: ptSounds; AltPath: ptNone),// sndInvulnerable

            (FileName:                  'ufo.ogg'; Path: ptSounds; AltPath: ptNone),// sndJetpackLaunch

            (FileName:         'jetpackboost.ogg'; Path: ptSounds; AltPath: ptNone),// sndJetpackBoost

            (FileName:           'portalshot.ogg'; Path: ptSounds; AltPath: ptNone),// sndPortalShot

            (FileName:         'portalswitch.ogg'; Path: ptSounds; AltPath: ptNone),// sndPortalSwitch

            (FileName:           'portalopen.ogg'; Path: ptSounds; AltPath: ptNone),// sndPortalOpen

            (FileName:            'blowtorch.ogg'; Path: ptSounds; AltPath: ptNone),// sndBlowTorch

            (FileName:           'countdown1.ogg'; Path: ptSounds; AltPath: ptNone),// sndCountdown1

            (FileName:           'countdown2.ogg'; Path: ptSounds; AltPath: ptNone),// sndCountdown2

            (FileName:           'countdown3.ogg'; Path: ptSounds; AltPath: ptNone),// sndCountdown3

            (FileName:           'countdown4.ogg'; Path: ptSounds; AltPath: ptNone),// sndCountdown4

            // TODO: Check which creeper (formerly rubberduck) sounds are needed, maybe rename them

            (FileName:      'rubberduck_drop.ogg'; Path: ptSounds; AltPath: ptNone),// sndCreeperDrop

            (FileName:     'rubberduck_water.ogg'; Path: ptSounds; AltPath: ptNone),// sndCreeperWater

            (FileName:       'rubberduck_die.ogg'; Path: ptSounds; AltPath: ptNone),// sndCreeperDie

            (FileName:              'custom1.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom1

            (FileName:              'custom2.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom2

            (FileName:              'custom3.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom3

            (FileName:              'custom4.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom4

            (FileName:              'custom5.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom5

            (FileName:              'custom6.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom6

            (FileName:              'custom7.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom7

            (FileName:              'custom8.ogg'; Path: ptSounds; AltPath: ptNone),// sndCustom8

            (FileName:              'minigun.ogg'; Path: ptSounds; AltPath: ptNone),// sndMinigun

            (FileName:         'flamethrower.ogg'; Path: ptSounds; AltPath: ptNone),// sndFlamethrower

            (FileName:        'ice_beam_idle.ogg'; Path: ptSounds; AltPath: ptNone),// sndIceBeamIdle

            (FileName:              'landgun.ogg'; Path: ptSounds; AltPath: ptNone),// sndLandGun

            (FileName:          'graveimpact.ogg'; Path: ptSounds; AltPath: ptNone),// sndCaseImpact

            // TODO: New Extra Damage sound

            );

function  AskForVoicepack(name: shortstring): Pointer;

var i: Longword;

    locName, path: shortstring;

begin

    i:= 0;

    // Adjust voicepack name if there's a localised version version of the voice

    if cLocale <> 'en' then

        begin

        locName:= name+'_'+cLocale;

        path:= cPathz[ptVoices] + '/' + locName;

        if pfsExists(path) then

            name:= locName

        else

            if Length(cLocale) > 3 then

                begin

                locName:= name+'_'+Copy(cLocale,1,2);

                path:= cPathz[ptVoices] + '/' + locName;

                if pfsExists(path) then

                    name:= locName

                end

        end;

    path:= cPathz[ptVoices] + '/' + name;

    // Fallback to Default if voicepack can't be found at all

    if (name <> 'Default') and (not pfsExists(path)) then

        begin

        path:= cPathz[ptVoices] + '/Default';

        if pfsExists(path) then

            exit(AskForVoicepack('Default'));

        end;

    while (voicepacks[i].name <> name) and (voicepacks[i].name <> '') and (i < cMaxTeams) do

        begin

        inc(i);

        //TryDo(i <= cMaxTeams, 'Engine bug: AskForVoicepack i > cMaxTeams', true)

        end;

    voicepacks[i].name:= name;

    AskForVoicepack:= @voicepacks[i]

end;

procedure InitSound;

const channels: LongInt = 2;

var success: boolean;

begin

    if not (isSoundEnabled or isMusicEnabled) then

        begin

        isAudioMuted:= true;

        cInitVolume:= 0;

        exit;

        end;

    WriteToConsole('Init sound...');

    success:= SDL_InitSubSystem(SDL_INIT_AUDIO) = 0;

    if success then

        begin

        WriteLnToConsole(msgOK);

        WriteToConsole('Open audio...');

        success:= Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, channels, 1024) = 0;

        end;

    if success then

        WriteLnToConsole(msgOK)

    else

    begin

        WriteLnToConsole(msgFailed);

        isSoundEnabled:= false;

        isMusicEnabled:= false;

        isAudioMuted:= true;

        cInitVolume:= 0;

    end;

    WriteToConsole('Init SDL_mixer... ');

    if SDLCheck(Mix_Init(MIX_INIT_OGG) <> 0, 'Mix_Init', true) then exit;

    WriteLnToConsole(msgOK);

    // from uVariables to be used by other modules

    cIsSoundEnabled:= true;

    Mix_AllocateChannels(Succ(chanTPU));

    previousVolume:= cInitVolume;

    ChangeVolume(cInitVolume);

end;

procedure ResetSound;

begin

    isSoundEnabled:= isSEBackup;

end;

procedure SetSound(enabled: boolean);

begin

    isSEBackup:= isSoundEnabled;

    isSoundEnabled:= enabled;

end;

procedure SetAudioDampen(enabled: boolean);

begin

    isAutoDampening:= enabled;

end;

// when complete is false, this procedure just releases some of the chucks on inactive channels

// in this way music is not stopped, nor are chucks currently being played

procedure ReleaseSound(complete: boolean);

var i: TSound;

    t: Longword;

begin

    // release and nil all sounds

    for t:= 0 to cMaxTeams do

        if voicepacks[t].name <> '' then

            for i:= Low(TSound) to High(TSound) do

                if voicepacks[t].chunks[i] <> nil then

                    if complete or (Mix_Playing(lastChan[i]) = 0) then

                        begin

                        Mix_HaltChannel(lastChan[i]);

                        lastChan[i]:= -1;

                        Mix_FreeChunk(voicepacks[t].chunks[i]);

                        voicepacks[t].chunks[i]:= nil;

                        end;

    // stop music

    if complete then

        begin

        if Mus <> nil then

            begin

            Mix_HaltMusic();

            Mix_FreeMusic(Mus);

            Mus:= nil;

            end;

        // make sure all instances of sdl_mixer are unloaded before continuing

        while Mix_Init(0) <> 0 do

            Mix_Quit();

        Mix_CloseAudio();

        end;

end;

procedure PlaySound(snd: TSound);

begin

    PlaySoundV(snd, nil, false, false, false);

end;

procedure PlaySound(snd: TSound; keepPlaying: boolean);

begin

    PlaySoundV(snd, nil, keepPlaying, false, false);

end;

procedure PlaySound(snd: TSound; keepPlaying: boolean; ignoreMask: boolean);

begin

    PlaySoundV(snd, nil, keepPlaying, ignoreMask, false);

end;

procedure PlaySound(snd: TSound; keepPlaying: boolean; ignoreMask, soundAsMusic: boolean);

begin

    PlaySoundV(snd, nil, keepPlaying, ignoreMask, soundAsMusic);

end;

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack);

begin

    PlaySoundV(snd, voicepack, false, false, false);

end;

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack; keepPlaying: boolean);

begin

    PlaySoundV(snd, voicepack, keepPlaying, false, false);

end;

procedure PlaySoundV(snd: TSound; voicepack: PVoicepack; keepPlaying, ignoreMask: boolean);

begin

    PlaySoundV(snd, voicepack, keepPlaying, ignoreMask, false);