/*
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/* Audio Core API (derived from OpenAL)
 */

#ifndef _AUDIOCORE_H
#define _AUDIOCORE_H

#include "config.h"
#include "types.h"


/* Available drivers */
enum
{
	audio_DRIVER_MIXSDL,
	audio_DRIVER_NOSOUND,
	audio_DRIVER_OPENAL
};

/* Initialization flags */
#define audio_QUALITY_HIGH   (1 << 0)
#define audio_QUALITY_MEDIUM (1 << 1)
#define audio_QUALITY_LOW    (1 << 2)


/* Interface Types */
typedef uintptr_t audio_Object;
typedef intptr_t audio_IntVal;
typedef const sint32 audio_SourceProp;
typedef const sint32 audio_BufferProp;

enum
{
	/* Errors */
	audio_NO_ERROR = 0,
	audio_INVALID_NAME,
	audio_INVALID_ENUM,
	audio_INVALID_VALUE,
	audio_INVALID_OPERATION,
	audio_OUT_OF_MEMORY,
	audio_DRIVER_FAILURE,

	/* Source properties */
	audio_POSITION,
	audio_LOOPING,
	audio_BUFFER,
	audio_GAIN,
	audio_SOURCE_STATE,
	audio_BUFFERS_QUEUED,
	audio_BUFFERS_PROCESSED,
	
	/* Source state information */
	audio_INITIAL,
	audio_STOPPED,
	audio_PLAYING,
	audio_PAUSED,

	/* Sound buffer properties */ 
	audio_FREQUENCY,
	audio_BITS,
	audio_CHANNELS,
	audio_SIZE,
	audio_FORMAT_MONO16,
	audio_FORMAT_STEREO16,
	audio_FORMAT_MONO8,
	audio_FORMAT_STEREO8,
	audio_ENUM_SIZE
};

extern int snddriver, soundflags;

typedef struct {
	/* General */
	void (* Uninitialize) (void);
	sint32 (* GetError) (void);
	sint32 driverID;
	sint32 EnumLookup[audio_ENUM_SIZE];

	/* Sources */
	void (* GenSources) (uint32 n, audio_Object *psrcobj);
	void (* DeleteSources) (uint32 n, audio_Object *psrcobj);
	bool (* IsSource) (audio_Object srcobj);
	void (* Sourcei) (audio_Object srcobj, audio_SourceProp pname,
			audio_IntVal value);
	void (* Sourcef) (audio_Object srcobj, audio_SourceProp pname,
			float value);
	void (* Sourcefv) (audio_Object srcobj, audio_SourceProp pname,
			float *value);
	void (* GetSourcei) (audio_Object srcobj, audio_SourceProp pname,
			audio_IntVal *value);
	void (* GetSourcef) (audio_Object srcobj, audio_SourceProp pname,
			float *value);
	void (* SourceRewind) (audio_Object srcobj);
	void (* SourcePlay) (audio_Object srcobj);
	void (* SourcePause) (audio_Object srcobj);
	void (* SourceStop) (audio_Object srcobj);
	void (* SourceQueueBuffers) (audio_Object srcobj, uint32 n,
			audio_Object* pbufobj);
	void (* SourceUnqueueBuffers) (audio_Object srcobj, uint32 n,
			audio_Object* pbufobj);

	/* Buffers */
	void (* GenBuffers) (uint32 n, audio_Object *pbufobj);
	void (* DeleteBuffers) (uint32 n, audio_Object *pbufobj);
	bool (* IsBuffer) (audio_Object bufobj);
	void (* GetBufferi) (audio_Object bufobj, audio_BufferProp pname,
			audio_IntVal *value);
	void (* BufferData) (audio_Object bufobj, uint32 format, void* data,
			uint32 size, uint32 freq);
} audio_Driver;


/* Initialization */
sint32 initAudio (sint32 driver, sint32 flags);
void unInitAudio (void);

/* General */
sint32 audio_GetError (void);

/* Sources */
void audio_GenSources (uint32 n, audio_Object *psrcobj);
void audio_DeleteSources (uint32 n, audio_Object *psrcobj);
bool audio_IsSource (audio_Object srcobj);
void audio_Sourcei (audio_Object srcobj, audio_SourceProp pname,
		audio_IntVal value);
void audio_Sourcef (audio_Object srcobj, audio_SourceProp pname,
		float value);
void audio_Sourcefv (audio_Object srcobj, audio_SourceProp pname,
		float *value);
void audio_GetSourcei (audio_Object srcobj, audio_SourceProp pname,
		audio_IntVal *value);
void audio_GetSourcef (audio_Object srcobj, audio_SourceProp pname,
		float *value);
void audio_SourceRewind (audio_Object srcobj);
void audio_SourcePlay (audio_Object srcobj);
void audio_SourcePause (audio_Object srcobj);
void audio_SourceStop (audio_Object srcobj);
void audio_SourceQueueBuffers (audio_Object srcobj, uint32 n,
		audio_Object* pbufobj);
void audio_SourceUnqueueBuffers (audio_Object srcobj, uint32 n,
		audio_Object* pbufobj);

/* Buffers */
void audio_GenBuffers (uint32 n, audio_Object *pbufobj);
void audio_DeleteBuffers (uint32 n, audio_Object *pbufobj);
bool audio_IsBuffer (audio_Object bufobj);
void audio_GetBufferi (audio_Object bufobj, audio_BufferProp pname,
		audio_IntVal *value);
void audio_BufferData (audio_Object bufobj, uint32 format, void* data,
		uint32 size, uint32 freq);

bool audio_GetFormatInfo (uint32 format, int *channels, int *sample_size);

#endif /* _AUDIOCORE_H */
