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diff --git a/3rdparty/include/SDL2/SDL_mixer.h b/3rdparty/include/SDL2/SDL_mixer.h
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+/*
+  SDL_mixer:  An audio mixer library based on the SDL library
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_MIXER_H_
+#define SDL_MIXER_H_
+
+#include "SDL_stdinc.h"
+#include "SDL_rwops.h"
+#include "SDL_audio.h"
+#include "SDL_endian.h"
+#include "SDL_version.h"
+#include "begin_code.h"
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Printable format: "%d.%d.%d", MAJOR, MINOR, PATCHLEVEL
+*/
+#define SDL_MIXER_MAJOR_VERSION 2
+#define SDL_MIXER_MINOR_VERSION 0
+#define SDL_MIXER_PATCHLEVEL    4
+
+/* This macro can be used to fill a version structure with the compile-time
+ * version of the SDL_mixer library.
+ */
+#define SDL_MIXER_VERSION(X)                        \
+{                                                   \
+    (X)->major = SDL_MIXER_MAJOR_VERSION;           \
+    (X)->minor = SDL_MIXER_MINOR_VERSION;           \
+    (X)->patch = SDL_MIXER_PATCHLEVEL;              \
+}
+
+/* Backwards compatibility */
+#define MIX_MAJOR_VERSION   SDL_MIXER_MAJOR_VERSION
+#define MIX_MINOR_VERSION   SDL_MIXER_MINOR_VERSION
+#define MIX_PATCHLEVEL      SDL_MIXER_PATCHLEVEL
+#define MIX_VERSION(X)      SDL_MIXER_VERSION(X)
+
+/**
+ *  This is the version number macro for the current SDL_mixer version.
+ */
+#define SDL_MIXER_COMPILEDVERSION \
+    SDL_VERSIONNUM(SDL_MIXER_MAJOR_VERSION, SDL_MIXER_MINOR_VERSION, SDL_MIXER_PATCHLEVEL)
+
+/**
+ *  This macro will evaluate to true if compiled with SDL_mixer at least X.Y.Z.
+ */
+#define SDL_MIXER_VERSION_ATLEAST(X, Y, Z) \
+    (SDL_MIXER_COMPILEDVERSION >= SDL_VERSIONNUM(X, Y, Z))
+
+/* This function gets the version of the dynamically linked SDL_mixer library.
+   it should NOT be used to fill a version structure, instead you should
+   use the SDL_MIXER_VERSION() macro.
+ */
+extern DECLSPEC const SDL_version * SDLCALL Mix_Linked_Version(void);
+
+typedef enum
+{
+    MIX_INIT_FLAC   = 0x00000001,
+    MIX_INIT_MOD    = 0x00000002,
+    MIX_INIT_MP3    = 0x00000008,
+    MIX_INIT_OGG    = 0x00000010,
+    MIX_INIT_MID    = 0x00000020,
+    MIX_INIT_OPUS   = 0x00000040
+} MIX_InitFlags;
+
+/* Loads dynamic libraries and prepares them for use.  Flags should be
+   one or more flags from MIX_InitFlags OR'd together.
+   It returns the flags successfully initialized, or 0 on failure.
+ */
+extern DECLSPEC int SDLCALL Mix_Init(int flags);
+
+/* Unloads libraries loaded with Mix_Init */
+extern DECLSPEC void SDLCALL Mix_Quit(void);
+
+
+/* The default mixer has 8 simultaneous mixing channels */
+#ifndef MIX_CHANNELS
+#define MIX_CHANNELS    8
+#endif
+
+/* Good default values for a PC soundcard */
+#define MIX_DEFAULT_FREQUENCY   22050
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+#define MIX_DEFAULT_FORMAT  AUDIO_S16LSB
+#else
+#define MIX_DEFAULT_FORMAT  AUDIO_S16MSB
+#endif
+#define MIX_DEFAULT_CHANNELS    2
+#define MIX_MAX_VOLUME          SDL_MIX_MAXVOLUME /* Volume of a chunk */
+
+/* The internal format for an audio chunk */
+typedef struct Mix_Chunk {
+    int allocated;
+    Uint8 *abuf;
+    Uint32 alen;
+    Uint8 volume;       /* Per-sample volume, 0-128 */
+} Mix_Chunk;
+
+/* The different fading types supported */
+typedef enum {
+    MIX_NO_FADING,
+    MIX_FADING_OUT,
+    MIX_FADING_IN
+} Mix_Fading;
+
+/* These are types of music files (not libraries used to load them) */
+typedef enum {
+    MUS_NONE,
+    MUS_CMD,
+    MUS_WAV,
+    MUS_MOD,
+    MUS_MID,
+    MUS_OGG,
+    MUS_MP3,
+    MUS_MP3_MAD_UNUSED,
+    MUS_FLAC,
+    MUS_MODPLUG_UNUSED,
+    MUS_OPUS
+} Mix_MusicType;
+
+/* The internal format for a music chunk interpreted via mikmod */
+typedef struct _Mix_Music Mix_Music;
+
+/* Open the mixer with a certain audio format */
+extern DECLSPEC int SDLCALL Mix_OpenAudio(int frequency, Uint16 format, int channels, int chunksize);
+
+/* Open the mixer with specific device and certain audio format */
+extern DECLSPEC int SDLCALL Mix_OpenAudioDevice(int frequency, Uint16 format, int channels, int chunksize, const char* device, int allowed_changes);
+
+/* Dynamically change the number of channels managed by the mixer.
+   If decreasing the number of channels, the upper channels are
+   stopped.
+   This function returns the new number of allocated channels.
+ */
+extern DECLSPEC int SDLCALL Mix_AllocateChannels(int numchans);
+
+/* Find out what the actual audio device parameters are.
+   This function returns 1 if the audio has been opened, 0 otherwise.
+ */
+extern DECLSPEC int SDLCALL Mix_QuerySpec(int *frequency,Uint16 *format,int *channels);
+
+/* Load a wave file or a music (.mod .s3m .it .xm) file */
+extern DECLSPEC Mix_Chunk * SDLCALL Mix_LoadWAV_RW(SDL_RWops *src, int freesrc);
+#define Mix_LoadWAV(file)   Mix_LoadWAV_RW(SDL_RWFromFile(file, "rb"), 1)
+extern DECLSPEC Mix_Music * SDLCALL Mix_LoadMUS(const char *file);
+
+/* Load a music file from an SDL_RWop object (Ogg and MikMod specific currently)
+   Matt Campbell (matt@campbellhome.dhs.org) April 2000 */
+extern DECLSPEC Mix_Music * SDLCALL Mix_LoadMUS_RW(SDL_RWops *src, int freesrc);
+
+/* Load a music file from an SDL_RWop object assuming a specific format */
+extern DECLSPEC Mix_Music * SDLCALL Mix_LoadMUSType_RW(SDL_RWops *src, Mix_MusicType type, int freesrc);
+
+/* Load a wave file of the mixer format from a memory buffer */
+extern DECLSPEC Mix_Chunk * SDLCALL Mix_QuickLoad_WAV(Uint8 *mem);
+
+/* Load raw audio data of the mixer format from a memory buffer */
+extern DECLSPEC Mix_Chunk * SDLCALL Mix_QuickLoad_RAW(Uint8 *mem, Uint32 len);
+
+/* Free an audio chunk previously loaded */
+extern DECLSPEC void SDLCALL Mix_FreeChunk(Mix_Chunk *chunk);
+extern DECLSPEC void SDLCALL Mix_FreeMusic(Mix_Music *music);
+
+/* Get a list of chunk/music decoders that this build of SDL_mixer provides.
+   This list can change between builds AND runs of the program, if external
+   libraries that add functionality become available.
+   You must successfully call Mix_OpenAudio() before calling these functions.
+   This API is only available in SDL_mixer 1.2.9 and later.
+
+   // usage...
+   int i;
+   const int total = Mix_GetNumChunkDecoders();
+   for (i = 0; i < total; i++)
+       printf("Supported chunk decoder: [%s]\n", Mix_GetChunkDecoder(i));
+
+   Appearing in this list doesn't promise your specific audio file will
+   decode...but it's handy to know if you have, say, a functioning Timidity
+   install.
+
+   These return values are static, read-only data; do not modify or free it.
+   The pointers remain valid until you call Mix_CloseAudio().
+*/
+extern DECLSPEC int SDLCALL Mix_GetNumChunkDecoders(void);
+extern DECLSPEC const char * SDLCALL Mix_GetChunkDecoder(int index);
+extern DECLSPEC SDL_bool SDLCALL Mix_HasChunkDecoder(const char *name);
+extern DECLSPEC int SDLCALL Mix_GetNumMusicDecoders(void);
+extern DECLSPEC const char * SDLCALL Mix_GetMusicDecoder(int index);
+extern DECLSPEC SDL_bool SDLCALL Mix_HasMusicDecoder(const char *name);
+
+/* Find out the music format of a mixer music, or the currently playing
+   music, if 'music' is NULL.
+*/
+extern DECLSPEC Mix_MusicType SDLCALL Mix_GetMusicType(const Mix_Music *music);
+
+/* Set a function that is called after all mixing is performed.
+   This can be used to provide real-time visual display of the audio stream
+   or add a custom mixer filter for the stream data.
+*/
+extern DECLSPEC void SDLCALL Mix_SetPostMix(void (SDLCALL *mix_func)(void *udata, Uint8 *stream, int len), void *arg);
+
+/* Add your own music player or additional mixer function.
+   If 'mix_func' is NULL, the default music player is re-enabled.
+ */
+extern DECLSPEC void SDLCALL Mix_HookMusic(void (SDLCALL *mix_func)(void *udata, Uint8 *stream, int len), void *arg);
+
+/* Add your own callback for when the music has finished playing or when it is
+ * stopped from a call to Mix_HaltMusic.
+ */
+extern DECLSPEC void SDLCALL Mix_HookMusicFinished(void (SDLCALL *music_finished)(void));
+
+/* Get a pointer to the user data for the current music hook */
+extern DECLSPEC void * SDLCALL Mix_GetMusicHookData(void);
+
+/*
+ * Add your own callback when a channel has finished playing. NULL
+ *  to disable callback. The callback may be called from the mixer's audio
+ *  callback or it could be called as a result of Mix_HaltChannel(), etc.
+ *  do not call SDL_LockAudio() from this callback; you will either be
+ *  inside the audio callback, or SDL_mixer will explicitly lock the audio
+ *  before calling your callback.
+ */
+extern DECLSPEC void SDLCALL Mix_ChannelFinished(void (SDLCALL *channel_finished)(int channel));
+
+
+/* Special Effects API by ryan c. gordon. (icculus@icculus.org) */
+
+#define MIX_CHANNEL_POST  -2
+
+/* This is the format of a special effect callback:
+ *
+ *   myeffect(int chan, void *stream, int len, void *udata);
+ *
+ * (chan) is the channel number that your effect is affecting. (stream) is
+ *  the buffer of data to work upon. (len) is the size of (stream), and
+ *  (udata) is a user-defined bit of data, which you pass as the last arg of
+ *  Mix_RegisterEffect(), and is passed back unmolested to your callback.
+ *  Your effect changes the contents of (stream) based on whatever parameters
+ *  are significant, or just leaves it be, if you prefer. You can do whatever
+ *  you like to the buffer, though, and it will continue in its changed state
+ *  down the mixing pipeline, through any other effect functions, then finally
+ *  to be mixed with the rest of the channels and music for the final output
+ *  stream.
+ *
+ * DO NOT EVER call SDL_LockAudio() from your callback function!
+ */
+typedef void (SDLCALL *Mix_EffectFunc_t)(int chan, void *stream, int len, void *udata);
+
+/*
+ * This is a callback that signifies that a channel has finished all its
+ *  loops and has completed playback. This gets called if the buffer
+ *  plays out normally, or if you call Mix_HaltChannel(), implicitly stop
+ *  a channel via Mix_AllocateChannels(), or unregister a callback while
+ *  it's still playing.
+ *
+ * DO NOT EVER call SDL_LockAudio() from your callback function!
+ */
+typedef void (SDLCALL *Mix_EffectDone_t)(int chan, void *udata);
+
+
+/* Register a special effect function. At mixing time, the channel data is
+ *  copied into a buffer and passed through each registered effect function.
+ *  After it passes through all the functions, it is mixed into the final
+ *  output stream. The copy to buffer is performed once, then each effect
+ *  function performs on the output of the previous effect. Understand that
+ *  this extra copy to a buffer is not performed if there are no effects
+ *  registered for a given chunk, which saves CPU cycles, and any given
+ *  effect will be extra cycles, too, so it is crucial that your code run
+ *  fast. Also note that the data that your function is given is in the
+ *  format of the sound device, and not the format you gave to Mix_OpenAudio(),
+ *  although they may in reality be the same. This is an unfortunate but
+ *  necessary speed concern. Use Mix_QuerySpec() to determine if you can
+ *  handle the data before you register your effect, and take appropriate
+ *  actions.
+ * You may also specify a callback (Mix_EffectDone_t) that is called when
+ *  the channel finishes playing. This gives you a more fine-grained control
+ *  than Mix_ChannelFinished(), in case you need to free effect-specific
+ *  resources, etc. If you don't need this, you can specify NULL.
+ * You may set the callbacks before or after calling Mix_PlayChannel().
+ * Things like Mix_SetPanning() are just internal special effect functions,
+ *  so if you are using that, you've already incurred the overhead of a copy
+ *  to a separate buffer, and that these effects will be in the queue with
+ *  any functions you've registered. The list of registered effects for a
+ *  channel is reset when a chunk finishes playing, so you need to explicitly
+ *  set them with each call to Mix_PlayChannel*().
+ * You may also register a special effect function that is to be run after
+ *  final mixing occurs. The rules for these callbacks are identical to those
+ *  in Mix_RegisterEffect, but they are run after all the channels and the
+ *  music have been mixed into a single stream, whereas channel-specific
+ *  effects run on a given channel before any other mixing occurs. These
+ *  global effect callbacks are call "posteffects". Posteffects only have
+ *  their Mix_EffectDone_t function called when they are unregistered (since
+ *  the main output stream is never "done" in the same sense as a channel).
+ *  You must unregister them manually when you've had enough. Your callback
+ *  will be told that the channel being mixed is (MIX_CHANNEL_POST) if the
+ *  processing is considered a posteffect.
+ *
+ * After all these effects have finished processing, the callback registered
+ *  through Mix_SetPostMix() runs, and then the stream goes to the audio
+ *  device.
+ *
+ * DO NOT EVER call SDL_LockAudio() from your callback function!
+ *
+ * returns zero if error (no such channel), nonzero if added.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_RegisterEffect(int chan, Mix_EffectFunc_t f, Mix_EffectDone_t d, void *arg);
+
+
+/* You may not need to call this explicitly, unless you need to stop an
+ *  effect from processing in the middle of a chunk's playback.
+ * Posteffects are never implicitly unregistered as they are for channels,
+ *  but they may be explicitly unregistered through this function by
+ *  specifying MIX_CHANNEL_POST for a channel.
+ * returns zero if error (no such channel or effect), nonzero if removed.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_UnregisterEffect(int channel, Mix_EffectFunc_t f);
+
+
+/* You may not need to call this explicitly, unless you need to stop all
+ *  effects from processing in the middle of a chunk's playback. Note that
+ *  this will also shut off some internal effect processing, since
+ *  Mix_SetPanning() and others may use this API under the hood. This is
+ *  called internally when a channel completes playback.
+ * Posteffects are never implicitly unregistered as they are for channels,
+ *  but they may be explicitly unregistered through this function by
+ *  specifying MIX_CHANNEL_POST for a channel.
+ * returns zero if error (no such channel), nonzero if all effects removed.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_UnregisterAllEffects(int channel);
+
+
+#define MIX_EFFECTSMAXSPEED  "MIX_EFFECTSMAXSPEED"
+
+/*
+ * These are the internally-defined mixing effects. They use the same API that
+ *  effects defined in the application use, but are provided here as a
+ *  convenience. Some effects can reduce their quality or use more memory in
+ *  the name of speed; to enable this, make sure the environment variable
+ *  MIX_EFFECTSMAXSPEED (see above) is defined before you call
+ *  Mix_OpenAudio().
+ */
+
+
+/* Set the panning of a channel. The left and right channels are specified
+ *  as integers between 0 and 255, quietest to loudest, respectively.
+ *
+ * Technically, this is just individual volume control for a sample with
+ *  two (stereo) channels, so it can be used for more than just panning.
+ *  If you want real panning, call it like this:
+ *
+ *   Mix_SetPanning(channel, left, 255 - left);
+ *
+ * ...which isn't so hard.
+ *
+ * Setting (channel) to MIX_CHANNEL_POST registers this as a posteffect, and
+ *  the panning will be done to the final mixed stream before passing it on
+ *  to the audio device.
+ *
+ * This uses the Mix_RegisterEffect() API internally, and returns without
+ *  registering the effect function if the audio device is not configured
+ *  for stereo output. Setting both (left) and (right) to 255 causes this
+ *  effect to be unregistered, since that is the data's normal state.
+ *
+ * returns zero if error (no such channel or Mix_RegisterEffect() fails),
+ *  nonzero if panning effect enabled. Note that an audio device in mono
+ *  mode is a no-op, but this call will return successful in that case.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_SetPanning(int channel, Uint8 left, Uint8 right);
+
+
+/* Set the position of a channel. (angle) is an integer from 0 to 360, that
+ *  specifies the location of the sound in relation to the listener. (angle)
+ *  will be reduced as neccesary (540 becomes 180 degrees, -100 becomes 260).
+ *  Angle 0 is due north, and rotates clockwise as the value increases.
+ *  For efficiency, the precision of this effect may be limited (angles 1
+ *  through 7 might all produce the same effect, 8 through 15 are equal, etc).
+ *  (distance) is an integer between 0 and 255 that specifies the space
+ *  between the sound and the listener. The larger the number, the further
+ *  away the sound is. Using 255 does not guarantee that the channel will be
+ *  culled from the mixing process or be completely silent. For efficiency,
+ *  the precision of this effect may be limited (distance 0 through 5 might
+ *  all produce the same effect, 6 through 10 are equal, etc). Setting (angle)
+ *  and (distance) to 0 unregisters this effect, since the data would be
+ *  unchanged.
+ *
+ * If you need more precise positional audio, consider using OpenAL for
+ *  spatialized effects instead of SDL_mixer. This is only meant to be a
+ *  basic effect for simple "3D" games.
+ *
+ * If the audio device is configured for mono output, then you won't get
+ *  any effectiveness from the angle; however, distance attenuation on the
+ *  channel will still occur. While this effect will function with stereo
+ *  voices, it makes more sense to use voices with only one channel of sound,
+ *  so when they are mixed through this effect, the positioning will sound
+ *  correct. You can convert them to mono through SDL before giving them to
+ *  the mixer in the first place if you like.
+ *
+ * Setting (channel) to MIX_CHANNEL_POST registers this as a posteffect, and
+ *  the positioning will be done to the final mixed stream before passing it
+ *  on to the audio device.
+ *
+ * This is a convenience wrapper over Mix_SetDistance() and Mix_SetPanning().
+ *
+ * returns zero if error (no such channel or Mix_RegisterEffect() fails),
+ *  nonzero if position effect is enabled.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_SetPosition(int channel, Sint16 angle, Uint8 distance);
+
+
+/* Set the "distance" of a channel. (distance) is an integer from 0 to 255
+ *  that specifies the location of the sound in relation to the listener.
+ *  Distance 0 is overlapping the listener, and 255 is as far away as possible
+ *  A distance of 255 does not guarantee silence; in such a case, you might
+ *  want to try changing the chunk's volume, or just cull the sample from the
+ *  mixing process with Mix_HaltChannel().
+ * For efficiency, the precision of this effect may be limited (distances 1
+ *  through 7 might all produce the same effect, 8 through 15 are equal, etc).
+ *  (distance) is an integer between 0 and 255 that specifies the space
+ *  between the sound and the listener. The larger the number, the further
+ *  away the sound is.
+ * Setting (distance) to 0 unregisters this effect, since the data would be
+ *  unchanged.
+ * If you need more precise positional audio, consider using OpenAL for
+ *  spatialized effects instead of SDL_mixer. This is only meant to be a
+ *  basic effect for simple "3D" games.
+ *
+ * Setting (channel) to MIX_CHANNEL_POST registers this as a posteffect, and
+ *  the distance attenuation will be done to the final mixed stream before
+ *  passing it on to the audio device.
+ *
+ * This uses the Mix_RegisterEffect() API internally.
+ *
+ * returns zero if error (no such channel or Mix_RegisterEffect() fails),
+ *  nonzero if position effect is enabled.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_SetDistance(int channel, Uint8 distance);
+
+
+/*
+ * !!! FIXME : Haven't implemented, since the effect goes past the
+ *              end of the sound buffer. Will have to think about this.
+ *               --ryan.
+ */
+#if 0
+/* Causes an echo effect to be mixed into a sound. (echo) is the amount
+ *  of echo to mix. 0 is no echo, 255 is infinite (and probably not
+ *  what you want).
+ *
+ * Setting (channel) to MIX_CHANNEL_POST registers this as a posteffect, and
+ *  the reverbing will be done to the final mixed stream before passing it on
+ *  to the audio device.
+ *
+ * This uses the Mix_RegisterEffect() API internally. If you specify an echo
+ *  of zero, the effect is unregistered, as the data is already in that state.
+ *
+ * returns zero if error (no such channel or Mix_RegisterEffect() fails),
+ *  nonzero if reversing effect is enabled.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern no_parse_DECLSPEC int SDLCALL Mix_SetReverb(int channel, Uint8 echo);
+#endif
+
+/* Causes a channel to reverse its stereo. This is handy if the user has his
+ *  speakers hooked up backwards, or you would like to have a minor bit of
+ *  psychedelia in your sound code.  :)  Calling this function with (flip)
+ *  set to non-zero reverses the chunks's usual channels. If (flip) is zero,
+ *  the effect is unregistered.
+ *
+ * This uses the Mix_RegisterEffect() API internally, and thus is probably
+ *  more CPU intensive than having the user just plug in his speakers
+ *  correctly. Mix_SetReverseStereo() returns without registering the effect
+ *  function if the audio device is not configured for stereo output.
+ *
+ * If you specify MIX_CHANNEL_POST for (channel), then this the effect is used
+ *  on the final mixed stream before sending it on to the audio device (a
+ *  posteffect).
+ *
+ * returns zero if error (no such channel or Mix_RegisterEffect() fails),
+ *  nonzero if reversing effect is enabled. Note that an audio device in mono
+ *  mode is a no-op, but this call will return successful in that case.
+ *  Error messages can be retrieved from Mix_GetError().
+ */
+extern DECLSPEC int SDLCALL Mix_SetReverseStereo(int channel, int flip);
+
+/* end of effects API. --ryan. */
+
+
+/* Reserve the first channels (0 -> n-1) for the application, i.e. don't allocate
+   them dynamically to the next sample if requested with a -1 value below.
+   Returns the number of reserved channels.
+ */
+extern DECLSPEC int SDLCALL Mix_ReserveChannels(int num);
+
+/* Channel grouping functions */
+
+/* Attach a tag to a channel. A tag can be assigned to several mixer
+   channels, to form groups of channels.
+   If 'tag' is -1, the tag is removed (actually -1 is the tag used to
+   represent the group of all the channels).
+   Returns true if everything was OK.
+ */
+extern DECLSPEC int SDLCALL Mix_GroupChannel(int which, int tag);
+/* Assign several consecutive channels to a group */
+extern DECLSPEC int SDLCALL Mix_GroupChannels(int from, int to, int tag);
+/* Finds the first available channel in a group of channels,
+   returning -1 if none are available.
+ */
+extern DECLSPEC int SDLCALL Mix_GroupAvailable(int tag);
+/* Returns the number of channels in a group. This is also a subtle
+   way to get the total number of channels when 'tag' is -1
+ */
+extern DECLSPEC int SDLCALL Mix_GroupCount(int tag);
+/* Finds the "oldest" sample playing in a group of channels */
+extern DECLSPEC int SDLCALL Mix_GroupOldest(int tag);
+/* Finds the "most recent" (i.e. last) sample playing in a group of channels */
+extern DECLSPEC int SDLCALL Mix_GroupNewer(int tag);
+
+/* Play an audio chunk on a specific channel.
+   If the specified channel is -1, play on the first free channel.
+   If 'loops' is greater than zero, loop the sound that many times.
+   If 'loops' is -1, loop inifinitely (~65000 times).
+   Returns which channel was used to play the sound.
+*/
+#define Mix_PlayChannel(channel,chunk,loops) Mix_PlayChannelTimed(channel,chunk,loops,-1)
+/* The same as above, but the sound is played at most 'ticks' milliseconds */
+extern DECLSPEC int SDLCALL Mix_PlayChannelTimed(int channel, Mix_Chunk *chunk, int loops, int ticks);
+extern DECLSPEC int SDLCALL Mix_PlayMusic(Mix_Music *music, int loops);
+
+/* Fade in music or a channel over "ms" milliseconds, same semantics as the "Play" functions */
+extern DECLSPEC int SDLCALL Mix_FadeInMusic(Mix_Music *music, int loops, int ms);
+extern DECLSPEC int SDLCALL Mix_FadeInMusicPos(Mix_Music *music, int loops, int ms, double position);
+#define Mix_FadeInChannel(channel,chunk,loops,ms) Mix_FadeInChannelTimed(channel,chunk,loops,ms,-1)
+extern DECLSPEC int SDLCALL Mix_FadeInChannelTimed(int channel, Mix_Chunk *chunk, int loops, int ms, int ticks);
+
+/* Set the volume in the range of 0-128 of a specific channel or chunk.
+   If the specified channel is -1, set volume for all channels.
+   Returns the original volume.
+   If the specified volume is -1, just return the current volume.
+*/
+extern DECLSPEC int SDLCALL Mix_Volume(int channel, int volume);
+extern DECLSPEC int SDLCALL Mix_VolumeChunk(Mix_Chunk *chunk, int volume);
+extern DECLSPEC int SDLCALL Mix_VolumeMusic(int volume);
+
+/* Halt playing of a particular channel */
+extern DECLSPEC int SDLCALL Mix_HaltChannel(int channel);
+extern DECLSPEC int SDLCALL Mix_HaltGroup(int tag);
+extern DECLSPEC int SDLCALL Mix_HaltMusic(void);
+
+/* Change the expiration delay for a particular channel.
+   The sample will stop playing after the 'ticks' milliseconds have elapsed,
+   or remove the expiration if 'ticks' is -1
+*/
+extern DECLSPEC int SDLCALL Mix_ExpireChannel(int channel, int ticks);
+
+/* Halt a channel, fading it out progressively till it's silent
+   The ms parameter indicates the number of milliseconds the fading
+   will take.
+ */
+extern DECLSPEC int SDLCALL Mix_FadeOutChannel(int which, int ms);
+extern DECLSPEC int SDLCALL Mix_FadeOutGroup(int tag, int ms);
+extern DECLSPEC int SDLCALL Mix_FadeOutMusic(int ms);
+
+/* Query the fading status of a channel */
+extern DECLSPEC Mix_Fading SDLCALL Mix_FadingMusic(void);
+extern DECLSPEC Mix_Fading SDLCALL Mix_FadingChannel(int which);
+
+/* Pause/Resume a particular channel */
+extern DECLSPEC void SDLCALL Mix_Pause(int channel);
+extern DECLSPEC void SDLCALL Mix_Resume(int channel);
+extern DECLSPEC int SDLCALL Mix_Paused(int channel);
+
+/* Pause/Resume the music stream */
+extern DECLSPEC void SDLCALL Mix_PauseMusic(void);
+extern DECLSPEC void SDLCALL Mix_ResumeMusic(void);
+extern DECLSPEC void SDLCALL Mix_RewindMusic(void);
+extern DECLSPEC int SDLCALL Mix_PausedMusic(void);
+
+/* Set the current position in the music stream.
+   This returns 0 if successful, or -1 if it failed or isn't implemented.
+   This function is only implemented for MOD music formats (set pattern
+   order number) and for OGG, FLAC, MP3_MAD, MP3_MPG and MODPLUG music
+   (set position in seconds), at the moment.
+*/
+extern DECLSPEC int SDLCALL Mix_SetMusicPosition(double position);
+
+/* Check the status of a specific channel.
+   If the specified channel is -1, check all channels.
+*/
+extern DECLSPEC int SDLCALL Mix_Playing(int channel);
+extern DECLSPEC int SDLCALL Mix_PlayingMusic(void);
+
+/* Stop music and set external music playback command */
+extern DECLSPEC int SDLCALL Mix_SetMusicCMD(const char *command);
+
+/* Synchro value is set by MikMod from modules while playing */
+extern DECLSPEC int SDLCALL Mix_SetSynchroValue(int value);
+extern DECLSPEC int SDLCALL Mix_GetSynchroValue(void);
+
+/* Set/Get/Iterate SoundFonts paths to use by supported MIDI backends */
+extern DECLSPEC int SDLCALL Mix_SetSoundFonts(const char *paths);
+extern DECLSPEC const char* SDLCALL Mix_GetSoundFonts(void);
+extern DECLSPEC int SDLCALL Mix_EachSoundFont(int (SDLCALL *function)(const char*, void*), void *data);
+
+/* Get the Mix_Chunk currently associated with a mixer channel
+    Returns NULL if it's an invalid channel, or there's no chunk associated.
+*/
+extern DECLSPEC Mix_Chunk * SDLCALL Mix_GetChunk(int channel);
+
+/* Close the mixer, halting all playing audio */
+extern DECLSPEC void SDLCALL Mix_CloseAudio(void);
+
+/* We'll use SDL for reporting errors */
+#define Mix_SetError    SDL_SetError
+#define Mix_GetError    SDL_GetError
+#define Mix_ClearError  SDL_ClearError
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_MIXER_H_ */
+
+/* vi: set ts=4 sw=4 expandtab: */