/*

 * OpenAL Bridge - a simple portable library for OpenAL interface

 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#ifdef __CPLUSPLUS

extern "C" {

#endif 

#pragma once

#pragma pack(1)

	typedef struct _WAV_header_t {

		uint32_t ChunkID;

		uint32_t ChunkSize;

		uint32_t Format;

		uint32_t Subchunk1ID;

		uint32_t Subchunk1Size;

		uint16_t AudioFormat;

		uint16_t NumChannels;

		uint32_t SampleRate;

		uint32_t ByteRate;

		uint16_t BlockAlign;

		uint16_t BitsPerSample;

		uint32_t Subchunk2ID;

		uint32_t Subchunk2Size;

	} WAV_header_t;

#pragma pack()

	/*data types for ogg and vorbis*/

#ifndef ogg_int64_t	

#define ogg_int64_t int64_t

#endif

	typedef struct {

		unsigned char *data;

		int storage;

		int fill;

		int returned;

		int unsynced;

		int headerbytes;

		int bodybytes;

	} ogg_sync_state;

	typedef struct vorbis_info{

		int version;

		int channels;

		long rate;

		/* The below bitrate declarations are *hints*.

		 Combinations of the three values carry the following implications:

		 all three set to the same value:

		 implies a fixed rate bitstream

		 only nominal set:

		 implies a VBR stream that averages the nominal bitrate.  No hard

		 upper/lower limit

		 upper and or lower set:

		 implies a VBR bitstream that obeys the bitrate limits. nominal

		 may also be set to give a nominal rate.

		 none set:

		 the coder does not care to speculate.

		 */

		long bitrate_upper;

		long bitrate_nominal;

		long bitrate_lower;

		long bitrate_window;

		void *codec_setup;

	} vorbis_info;

	typedef struct vorbis_comment{

		/* unlimited user comment fields.  libvorbis writes 'libvorbis'

		 whatever vendor is set to in encode */

		char **user_comments;

		int   *comment_lengths;

		int    comments;

		char  *vendor;

	} vorbis_comment;

	typedef struct {

		unsigned char   *body_data;    /* bytes from packet bodies */

		long    body_storage;          /* storage elements allocated */

		long    body_fill;             /* elements stored; fill mark */

		long    body_returned;         /* elements of fill returned */

		int     *lacing_vals;      /* The values that will go to the segment table */

		ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact

		 this way, but it is simple coupled to the

		 lacing fifo */

		long    lacing_storage;

		long    lacing_fill;

		long    lacing_packet;

		long    lacing_returned;

		unsigned char    header[282];      /* working space for header encode */

		int              header_fill;

		int     e_o_s;          /* set when we have buffered the last packet in the

		 logical bitstream */

		int     b_o_s;          /* set after we've written the initial page

		 of a logical bitstream */

		long    serialno;

		long    pageno;

		ogg_int64_t  packetno;      /* sequence number for decode; the framing

		 knows where there's a hole in the data,

		 but we need coupling so that the codec

		 (which is in a seperate abstraction

		 layer) also knows about the gap */

		ogg_int64_t   granulepos;

	} ogg_stream_state;

	typedef struct vorbis_dsp_state{

		int analysisp;

		vorbis_info *vi;

		float **pcm;

		float **pcmret;

		int      pcm_storage;

		int      pcm_current;

		int      pcm_returned;

		int  preextrapolate;

		int  eofflag;

		long lW;

		long W;

		long nW;

		long centerW;

		ogg_int64_t granulepos;

		ogg_int64_t sequence;

		ogg_int64_t glue_bits;

		ogg_int64_t time_bits;

		ogg_int64_t floor_bits;

		ogg_int64_t res_bits;

		void       *backend_state;

	} vorbis_dsp_state;

	typedef struct {

		long endbyte;

		int  endbit;

		unsigned char *buffer;

		unsigned char *ptr;

		long storage;

	} oggpack_buffer;

	typedef struct vorbis_block{

		/* necessary stream state for linking to the framing abstraction */

		float  **pcm;       /* this is a pointer into local storage */

		oggpack_buffer opb;

		long  lW;

		long  W;

		long  nW;

		int   pcmend;

		int   mode;

		int         eofflag;

		ogg_int64_t granulepos;

		ogg_int64_t sequence;

		vorbis_dsp_state *vd; /* For read-only access of configuration */

		/* local storage to avoid remallocing; it's up to the mapping to

		 structure it */

		void               *localstore;

		long                localtop;

		long                localalloc;

		long                totaluse;

		struct alloc_chain *reap;

		/* bitmetrics for the frame */

		long glue_bits;

		long time_bits;

		long floor_bits;

		long res_bits;

		void *internal;

	} vorbis_block;

	typedef struct {

		size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);

		int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);

		int    (*close_func) (void *datasource);

		long   (*tell_func)  (void *datasource);

	} ov_callbacks;

	typedef struct OggVorbis_File {

		void            *datasource; /* Pointer to a FILE *, etc. */

		int              seekable;

		ogg_int64_t      offset;

		ogg_int64_t      end;

		ogg_sync_state   oy;

		/* If the FILE handle isn't seekable (eg, a pipe), only the current

		 stream appears */

		int              links;

		ogg_int64_t     *offsets;

		ogg_int64_t     *dataoffsets;

		long            *serialnos;

		ogg_int64_t     *pcmlengths; /* overloaded to maintain binary

		 compatability; x2 size, stores both

		 beginning and end values */

		vorbis_info     *vi;

		vorbis_comment  *vc;

		/* Decoding working state local storage */

		ogg_int64_t      pcm_offset;

		int              ready_state;

		long             current_serialno;

		int              current_link;

		double           bittrack;

		double           samptrack;

		ogg_stream_state os; /* take physical pages, weld into a logical

		 stream of packets */

		vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */

		vorbis_block     vb; /* local working space for packet->PCM decode */

		ov_callbacks callbacks;

	} OggVorbis_File;

	int load_WavPcm		(const char *filename, ALenum *format, uint8_t **data, ALsizei *bitsize, ALsizei *freq);

	int load_OggVorbis	(const char *filename, ALenum *format, uint8_t **data, ALsizei *bitsize, ALsizei *freq);

#ifdef __CPLUSPLUS

}

#endif