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+/*******************************************************************************
+  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ 
+  (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
+                            Jerremy Koot (jkoot@snes9x.com)
+
+  (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
+
+  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
+                            funkyass (funkyass@spam.shaw.ca),
+                            Joel Yliluoma (http://iki.fi/bisqwit/)
+                            Kris Bleakley (codeviolation@hotmail.com),
+                            Matthew Kendora,
+                            Nach (n-a-c-h@users.sourceforge.net),
+                            Peter Bortas (peter@bortas.org) and
+                            zones (kasumitokoduck@yahoo.com)
+
+  C4 x86 assembler and some C emulation code
+  (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
+                            _Demo_ (_demo_@zsnes.com), and Nach
+
+  C4 C++ code
+  (c) Copyright 2003 Brad Jorsch
+
+  DSP-1 emulator code
+  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
+                            John Weidman, neviksti (neviksti@hotmail.com),
+                            Kris Bleakley, Andreas Naive
+
+  DSP-2 emulator code
+  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
+                     Lord Nightmare (lord_nightmare@users.sourceforge.net
+
+  OBC1 emulator code
+  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
+                            Kris Bleakley
+  Ported from x86 assembler to C by sanmaiwashi
+
+  SPC7110 and RTC C++ emulator code
+  (c) Copyright 2002 Matthew Kendora with research by
+                     zsKnight, John Weidman, and Dark Force
+
+  S-DD1 C emulator code
+  (c) Copyright 2003 Brad Jorsch with research by
+                     Andreas Naive and John Weidman
+ 
+  S-RTC C emulator code
+  (c) Copyright 2001 John Weidman
+  
+  ST010 C++ emulator code
+  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
+
+  Super FX x86 assembler emulator code 
+  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 
+
+  Super FX C emulator code 
+  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
+
+
+  SH assembler code partly based on x86 assembler code
+  (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se) 
+
+ 
+  Specific ports contains the works of other authors. See headers in
+  individual files.
+ 
+  Snes9x homepage: http://www.snes9x.com
+ 
+  Permission to use, copy, modify and distribute Snes9x in both binary and
+  source form, for non-commercial purposes, is hereby granted without fee,
+  providing that this license information and copyright notice appear with
+  all copies and any derived work.
+ 
+  This software is provided 'as-is', without any express or implied
+  warranty. In no event shall the authors be held liable for any damages
+  arising from the use of this software.
+ 
+  Snes9x is freeware for PERSONAL USE only. Commercial users should
+  seek permission of the copyright holders first. Commercial use includes
+  charging money for Snes9x or software derived from Snes9x.
+ 
+  The copyright holders request that bug fixes and improvements to the code
+  should be forwarded to them so everyone can benefit from the modifications
+  in future versions.
+ 
+  Super NES and Super Nintendo Entertainment System are trademarks of
+  Nintendo Co., Limited and its subsidiary companies.
+*******************************************************************************/
+#ifndef _SOUND_H_
+#define _SOUND_H_
+
+enum { SOUND_SAMPLE = 0, SOUND_NOISE, SOUND_EXTRA_NOISE, SOUND_MUTE };
+enum { SOUND_SILENT, SOUND_ATTACK, SOUND_DECAY, SOUND_SUSTAIN,
+       SOUND_RELEASE, SOUND_GAIN, SOUND_INCREASE_LINEAR,
+       SOUND_INCREASE_BENT_LINE, SOUND_DECREASE_LINEAR,
+       SOUND_DECREASE_EXPONENTIAL};
+
+enum { MODE_NONE = SOUND_SILENT, MODE_ADSR, MODE_RELEASE = SOUND_RELEASE,
+       MODE_GAIN, MODE_INCREASE_LINEAR, MODE_INCREASE_BENT_LINE,
+       MODE_DECREASE_LINEAR, MODE_DECREASE_EXPONENTIAL};
+
+#define MAX_ENVELOPE_HEIGHT 127
+#define ENVELOPE_SHIFT 7
+#define MAX_VOLUME 127
+#define VOLUME_SHIFT 7
+#define VOL_DIV 128
+#define SOUND_DECODE_LENGTH 16
+
+#define NUM_CHANNELS    8
+#define SOUND_BUFFER_SIZE (1024 * 16)
+#define MAX_BUFFER_SIZE SOUND_BUFFER_SIZE
+#define SOUND_BUFFER_SIZE_MASK (SOUND_BUFFER_SIZE - 1)
+
+#define SOUND_BUFS      4
+
+#ifdef __sgi
+#  include <audio.h>
+#endif /* __sgi */
+
+typedef struct {
+    int sound_fd;
+    int sound_switch;
+    int playback_rate;
+    int buffer_size;
+    int noise_gen;
+    bool8 mute_sound;
+    int stereo;
+    bool8 sixteen_bit;
+    bool8 encoded;
+#ifdef __sun
+    int last_eof;
+#endif
+#ifdef __sgi
+    ALport al_port;
+#endif /* __sgi */
+    int32  samples_mixed_so_far;
+    int32  play_position;
+    uint32 err_counter;
+    uint32 err_rate;
+} SoundStatus;
+
+EXTERN_C volatile SoundStatus so;
+
+typedef struct {
+    int state;
+    int type;
+    short volume_left;
+    short volume_right;
+    uint32 hertz;
+    uint32 frequency;
+    uint32 count;
+    bool8 loop;
+    int envx;
+    short left_vol_level;
+    short right_vol_level;
+    short envx_target;
+    unsigned long int env_error;
+    unsigned long erate;
+    int direction;
+    unsigned long attack_rate;
+    unsigned long decay_rate;
+    unsigned long sustain_rate;
+    unsigned long release_rate;
+    unsigned long sustain_level;
+    signed short sample;
+    signed short decoded [16];
+    signed short previous16 [2];
+    signed short *block;
+    uint16 sample_number;
+    bool8 last_block;
+    bool8 needs_decode;
+    uint32 block_pointer;
+    uint32 sample_pointer;
+    int *echo_buf_ptr;
+    int mode;
+    int32 envxx;
+    signed short next_sample;
+    int32 interpolate;
+    int32 previous [2];
+    // Just incase they are needed in the future, for snapshot compatibility.
+    uint32 dummy [8];
+//	unsigned short last_valid_header;
+} Channel;
+
+typedef struct
+{
+    short master_volume_left;
+    short master_volume_right;
+    short echo_volume_left;
+    short echo_volume_right;
+    int echo_enable;
+    int echo_feedback;
+    int echo_ptr;
+    int echo_buffer_size;
+    int echo_write_enabled;
+    int echo_channel_enable;
+    int pitch_mod;
+    // Just incase they are needed in the future, for snapshot compatibility.
+    uint32 dummy [3];
+    Channel channels [NUM_CHANNELS];
+    bool8 no_filter;
+    int master_volume [2];
+    int echo_volume [2];
+    int noise_hertz;
+} SSoundData;
+
+EXTERN_C SSoundData SoundData;
+
+void S9xSetSoundVolume (int channel, short volume_left, short volume_right);
+void S9xSetSoundFrequency (int channel, int hertz);
+void S9xSetSoundHertz (int channel, int hertz);
+void S9xSetSoundType (int channel, int type_of_sound);
+void S9xSetMasterVolume (short master_volume_left, short master_volume_right);
+void S9xSetEchoVolume (short echo_volume_left, short echo_volume_right);
+void S9xSetSoundControl (int sound_switch);
+bool8 S9xSetSoundMute (bool8 mute);
+void S9xSetEnvelopeHeight (int channel, int height);
+void S9xSetSoundADSR (int channel, int attack, int decay, int sustain,
+		      int sustain_level, int release);
+void S9xSetSoundKeyOff (int channel);
+void S9xSetSoundDecayMode (int channel);
+void S9xSetSoundAttachMode (int channel);
+void S9xSoundStartEnvelope (Channel *);
+void S9xSetSoundSample (int channel, uint16 sample_number);
+void S9xSetEchoFeedback (int echo_feedback);
+void S9xSetEchoEnable (uint8 byte);
+void S9xSetEchoDelay (int byte);
+void S9xSetEchoWriteEnable (uint8 byte);
+void S9xSetFilterCoefficient (int tap, int value);
+void S9xSetFrequencyModulationEnable (uint8 byte);
+void S9xSetEnvelopeRate (int channel, unsigned long rate, int direction,
+			 int target);
+bool8 S9xSetSoundMode (int channel, int mode);
+int S9xGetEnvelopeHeight (int channel);
+void S9xResetSound (bool8 full);
+void S9xFixSoundAfterSnapshotLoad ();
+void S9xPlaybackSoundSetting (int channel);
+void S9xPlaySample (int channel);
+void S9xFixEnvelope (int channel, uint8 gain, uint8 adsr1, uint8 adsr2);
+void S9xStartSample (int channel);
+
+EXTERN_C void S9xMixSamples (uint8 *buffer, int sample_count);
+EXTERN_C void S9xMixSamplesO (uint8 *buffer, int sample_count, int byte_offset);
+bool8 S9xOpenSoundDevice (int, bool8, int);
+void S9xSetPlaybackRate (uint32 rate);
+#endif
+