/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
Copyright (C) 2007 HermitWorks Entertainment Corporation

This file is part of the Space Trader source code.

The Space Trader source code 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; either version 2 of the License,
or (at your option) any later version.

The Space Trader source code 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 the Space Trader source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
// snd_local.h -- private sound definations


#include "../qcommon/q_shared.h"
#include "../qcommon/qcommon.h"
#include "snd_public.h"

#define	PAINTBUFFER_SIZE		4096					// this is in samples

#define SND_CHUNK_SIZE			1024					// samples
#define SND_CHUNK_SIZE_FLOAT	(SND_CHUNK_SIZE/2)		// floats
#define SND_CHUNK_SIZE_BYTE		(SND_CHUNK_SIZE*2)		// floats

typedef struct {
	int			left;	// the final values will be clamped to +/- 0x00ffff00 and shifted down
	int			right;
} portable_samplepair_t;

typedef struct adpcm_state {
    short	sample;		/* Previous output value */
    char	index;		/* Index into stepsize table */
} adpcm_state_t;

typedef	struct sndBuffer_s {
	short					sndChunk[SND_CHUNK_SIZE];
	struct sndBuffer_s		*next;
    int						size;
	adpcm_state_t			adpcm;
} sndBuffer;

typedef struct sfx_s {
	sndBuffer		*soundData;
	qboolean		defaultSound;			// couldn't be loaded, so use buzz
	qboolean		inMemory;				// not in Memory
	qboolean		soundCompressed;		// not in Memory
	int				soundCompressionMethod;	
	int 			soundLength;
	char 			soundName[MAX_QPATH];
	int				lastTimeUsed;
	struct sfx_s	*next;
} sfx_t;

typedef struct {
	int			channels;
	int			samples;				// mono samples in buffer
	int			submission_chunk;		// don't mix less than this #
	int			samplebits;
	int			speed;
	byte		*buffer;
} dma_t;

#define START_SAMPLE_IMMEDIATE	0x7fffffff

#define MAX_DOPPLER_SCALE 50.0f //arbitrary

typedef struct loopSound_s {
	vec3_t		origin;
	vec3_t		velocity;
	sfx_t		*sfx;
	int			mergeFrame;
	qboolean	active;
	qboolean	kill;
	qboolean	doppler;
	float		dopplerScale;
	float		oldDopplerScale;
	int			framenum;
} loopSound_t;

typedef struct channel_s
{
	/*
		The first few bytes of this struct are shared
		between the allocTime and the freelist.

		The only way to tell which of the two is valid seems
		to be the thesfx field. If it's null the channel is in
		the free list and allocTime is garbage. I'm not sure if
		the converse holds.
	*/
	
	int			allocTime;
	int			startSample;	// START_SAMPLE_IMMEDIATE = set immediately on next mix
	int			entnum;			// to allow overriding a specific sound
	int			entchannel;		// to allow overriding a specific sound
	int			leftvol;		// 0-255 volume after spatialization
	int			rightvol;		// 0-255 volume after spatialization
	int			master_vol;		// 0-255 volume before spatialization
	float		dopplerScale;
	float		oldDopplerScale;
	vec3_t		origin;			// only use if fixed_origin is set
	qboolean	fixed_origin;	// use origin instead of fetching entnum's origin
	sfx_t		*thesfx;		// sfx structure
	qboolean	doppler;

	struct channel_s *nextFree;	// only valid while sfx = NULL
} channel_t;


#define	WAV_FORMAT_PCM		1


typedef struct {
	int			format;
	int			rate;
	int			width;
	int			channels;
	int			samples;
	int			dataofs;		// chunk starts this many bytes from file start
} wavinfo_t;

// Interface between Q3 sound "api" and the sound backend
typedef struct
{
	void (*Shutdown)(void);
	void (*StartSound)( vec3_t origin, int entnum, int entchannel, sfxHandle_t sfx );
	void (*StartLocalSound)( sfxHandle_t sfx, int channelNum );
	void (*StartBackgroundTrack)( const char *intro, const char *loop );
	void (*StopBackgroundTrack)( void );
	void (*RawSamples)(int samples, int rate, int width, int channels, const byte *data, float volume);
	void (*StopAllSounds)( void );
	void (*ClearLoopingSounds)( qboolean killall );
	void (*AddLoopingSound)( int entityNum, const vec3_t origin, const vec3_t velocity, sfxHandle_t sfx );
	void (*AddRealLoopingSound)( int entityNum, const vec3_t origin, const vec3_t velocity, sfxHandle_t sfx );
	void (*StopLoopingSound)(int entityNum );
	void (*Respatialize)( int entityNum, const vec3_t origin, vec3_t axis[3], int inwater );
	void (*UpdateEntityPosition)( int entityNum, const vec3_t origin );
	void (*Update)( void );
	void (*DisableSounds)( void );
	void (*BeginRegistration)( void );
	sfxHandle_t (*RegisterSound)( const char *sample, qboolean compressed );
	void (*ClearSoundBuffer)( void );
	void (*SoundInfo)( void );
	void (*SoundList)( void );
	char *(*DumpGetSoundString)( const char *pre, const char *post, const char *fmt );
} soundInterface_t;


/*
====================================================================

  SYSTEM SPECIFIC FUNCTIONS

====================================================================
*/

// initializes cycling through a DMA buffer and returns information on it
qboolean SNDDMA_Init(void);

// gets the current DMA position
int		SNDDMA_GetDMAPos(void);

// shutdown the DMA xfer.
void	SNDDMA_Shutdown(void);

void	SNDDMA_BeginPainting (void);

void	SNDDMA_Submit(void);

//====================================================================

#define	MAX_CHANNELS			96

extern	channel_t   s_channels[MAX_CHANNELS];
extern	channel_t   loop_channels[MAX_CHANNELS];
extern	int		numLoopChannels;

extern	int		s_paintedtime;
extern	int		s_rawend;
extern	vec3_t	listener_forward;
extern	vec3_t	listener_right;
extern	vec3_t	listener_up;
extern	dma_t	dma;

#define	MAX_RAW_SAMPLES	16384
extern	portable_samplepair_t	s_rawsamples[MAX_RAW_SAMPLES];

extern cvar_t *s_volume;
extern cvar_t *s_musicVolume;
extern cvar_t *s_doppler;

extern cvar_t *s_testsound;

qboolean S_LoadSound( sfx_t *sfx );

void		SND_free(sndBuffer *v);
sndBuffer*	SND_malloc( void );
void		SND_setup( void );
void		SND_shutdown( void );

void S_PaintChannels(int endtime);

void S_memoryLoad(sfx_t *sfx);
portable_samplepair_t *S_GetRawSamplePointer( void );

// spatializes a channel
void S_Spatialize(channel_t *ch);

// adpcm functions
int  S_AdpcmMemoryNeeded( const wavinfo_t *info );
void S_AdpcmEncodeSound( sfx_t *sfx, short *samples );
void S_AdpcmGetSamples(sndBuffer *chunk, short *to);

// wavelet function

#define SENTINEL_MULAW_ZERO_RUN 127
#define SENTINEL_MULAW_FOUR_BIT_RUN 126

void S_FreeOldestSound( void );

#define	NXStream byte

void encodeWavelet(sfx_t *sfx, short *packets);
void decodeWavelet( sndBuffer *stream, short *packets);

void encodeMuLaw( sfx_t *sfx, short *packets);
extern short mulawToShort[256];

extern short *sfxScratchBuffer;
extern sfx_t *sfxScratchPointer;
extern int	   sfxScratchIndex;

qboolean S_Base_Init( soundInterface_t *si );

// OpenAL stuff
typedef enum
{
	SRCPRI_AMBIENT = 0,	// Ambient sound effects
	SRCPRI_ENTITY,			// Entity sound effects
	SRCPRI_ONESHOT,			// One-shot sounds
	SRCPRI_LOCAL,				// Local sounds
	SRCPRI_STREAM				// Streams (music, cutscenes)
} alSrcPriority_t;

typedef int srcHandle_t;

qboolean S_AL_Init( soundInterface_t *si );