openalbridge/loaders.h
author unc0rr
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/*
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 * OpenAL Bridge - a simple portable library for OpenAL interface
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 * Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include "al.h"
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#include "alc.h"
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#include "endianness.h"
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#include "wrappers.h"
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#ifndef _WIN32
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#include <stdint.h>
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#else
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#include "winstdint.h"
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#endif
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#ifdef __CPLUSPLUS
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extern "C" {
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#endif 
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#pragma once
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#pragma pack(1)
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	typedef struct _WAV_header_t {
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		uint32_t ChunkID;
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		uint32_t ChunkSize;
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		uint32_t Format;
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		uint32_t Subchunk1ID;
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		uint32_t Subchunk1Size;
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		uint16_t AudioFormat;
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		uint16_t NumChannels;
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		uint32_t SampleRate;
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		uint32_t ByteRate;
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		uint16_t BlockAlign;
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		uint16_t BitsPerSample;
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		uint32_t Subchunk2ID;
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		uint32_t Subchunk2Size;
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	} WAV_header_t;
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#pragma pack()
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	/*data types for ogg and vorbis*/
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#ifndef ogg_int64_t	
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#define ogg_int64_t int64_t
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#endif
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	typedef struct {
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		unsigned char *data;
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		int storage;
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		int fill;
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		int returned;
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		int unsynced;
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		int headerbytes;
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		int bodybytes;
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	} ogg_sync_state;
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	typedef struct vorbis_info{
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		int version;
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		int channels;
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		long rate;
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		/* The below bitrate declarations are *hints*.
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		 Combinations of the three values carry the following implications:
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		 all three set to the same value:
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		 implies a fixed rate bitstream
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		 only nominal set:
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		 implies a VBR stream that averages the nominal bitrate.  No hard
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		 upper/lower limit
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		 upper and or lower set:
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		 implies a VBR bitstream that obeys the bitrate limits. nominal
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		 may also be set to give a nominal rate.
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		 none set:
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		 the coder does not care to speculate.
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		 */
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		long bitrate_upper;
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		long bitrate_nominal;
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		long bitrate_lower;
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		long bitrate_window;
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		void *codec_setup;
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	} vorbis_info;
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	typedef struct vorbis_comment{
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		/* unlimited user comment fields.  libvorbis writes 'libvorbis'
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		 whatever vendor is set to in encode */
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		char **user_comments;
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		int   *comment_lengths;
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		int    comments;
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		char  *vendor;
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	} vorbis_comment;
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	typedef struct {
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		unsigned char   *body_data;    /* bytes from packet bodies */
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		long    body_storage;          /* storage elements allocated */
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		long    body_fill;             /* elements stored; fill mark */
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		long    body_returned;         /* elements of fill returned */
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		int     *lacing_vals;      /* The values that will go to the segment table */
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		ogg_int64_t *granule_vals; /* granulepos values for headers. Not compact
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		 this way, but it is simple coupled to the
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		 lacing fifo */
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		long    lacing_storage;
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		long    lacing_fill;
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		long    lacing_packet;
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		long    lacing_returned;
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		unsigned char    header[282];      /* working space for header encode */
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		int              header_fill;
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		int     e_o_s;          /* set when we have buffered the last packet in the
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		 logical bitstream */
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		int     b_o_s;          /* set after we've written the initial page
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		 of a logical bitstream */
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		long    serialno;
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		long    pageno;
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		ogg_int64_t  packetno;      /* sequence number for decode; the framing
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		 knows where there's a hole in the data,
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		 but we need coupling so that the codec
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		 (which is in a seperate abstraction
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		 layer) also knows about the gap */
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		ogg_int64_t   granulepos;
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	} ogg_stream_state;
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	typedef struct vorbis_dsp_state{
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		int analysisp;
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		vorbis_info *vi;
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		float **pcm;
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		float **pcmret;
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		int      pcm_storage;
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		int      pcm_current;
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		int      pcm_returned;
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		int  preextrapolate;
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		int  eofflag;
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		long lW;
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		long W;
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		long nW;
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		long centerW;
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		ogg_int64_t granulepos;
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		ogg_int64_t sequence;
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		ogg_int64_t glue_bits;
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		ogg_int64_t time_bits;
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		ogg_int64_t floor_bits;
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		ogg_int64_t res_bits;
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		void       *backend_state;
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	} vorbis_dsp_state;
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	typedef struct {
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		long endbyte;
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		int  endbit;
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		unsigned char *buffer;
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		unsigned char *ptr;
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		long storage;
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	} oggpack_buffer;
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	typedef struct vorbis_block{
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		/* necessary stream state for linking to the framing abstraction */
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		float  **pcm;       /* this is a pointer into local storage */
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		oggpack_buffer opb;
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		long  lW;
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		long  W;
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		long  nW;
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		int   pcmend;
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		int   mode;
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		int         eofflag;
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		ogg_int64_t granulepos;
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		ogg_int64_t sequence;
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		vorbis_dsp_state *vd; /* For read-only access of configuration */
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		/* local storage to avoid remallocing; it's up to the mapping to
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		 structure it */
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		void               *localstore;
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		long                localtop;
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		long                localalloc;
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		long                totaluse;
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		struct alloc_chain *reap;
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		/* bitmetrics for the frame */
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		long glue_bits;
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		long time_bits;
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		long floor_bits;
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		long res_bits;
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		void *internal;
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	} vorbis_block;
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	typedef struct {
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		size_t (*read_func)  (void *ptr, size_t size, size_t nmemb, void *datasource);
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		int    (*seek_func)  (void *datasource, ogg_int64_t offset, int whence);
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		int    (*close_func) (void *datasource);
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		long   (*tell_func)  (void *datasource);
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	} ov_callbacks;
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	typedef struct OggVorbis_File {
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		void            *datasource; /* Pointer to a FILE *, etc. */
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		int              seekable;
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		ogg_int64_t      offset;
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		ogg_int64_t      end;
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		ogg_sync_state   oy;
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		/* If the FILE handle isn't seekable (eg, a pipe), only the current
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		 stream appears */
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		int              links;
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		ogg_int64_t     *offsets;
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		ogg_int64_t     *dataoffsets;
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		long            *serialnos;
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		ogg_int64_t     *pcmlengths; /* overloaded to maintain binary
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		 compatability; x2 size, stores both
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		 beginning and end values */
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		vorbis_info     *vi;
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		vorbis_comment  *vc;
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		/* Decoding working state local storage */
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		ogg_int64_t      pcm_offset;
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		int              ready_state;
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		long             current_serialno;
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		int              current_link;
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		double           bittrack;
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		double           samptrack;
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		ogg_stream_state os; /* take physical pages, weld into a logical
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		 stream of packets */
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		vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */
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		vorbis_block     vb; /* local working space for packet->PCM decode */
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		ov_callbacks callbacks;
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	} OggVorbis_File;
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	int load_WavPcm		(const char *filename, ALenum *format, uint8_t **data, ALsizei *bitsize, ALsizei *freq);
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	int load_OggVorbis	(const char *filename, ALenum *format, uint8_t **data, ALsizei *bitsize, ALsizei *freq);
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#ifdef __CPLUSPLUS
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}
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#endif