vgmstream/src/vgmstream.h

/*
 * vgmstream.h - definitions for VGMSTREAM, encapsulating a multi-channel, looped audio stream
 */

#ifndef _VGMSTREAM_H
#define _VGMSTREAM_H

enum { PATH_LIMIT = 32768 };

#include "streamfile.h"

/* Due mostly to licensing issues, Vorbis, MPEG, G.722.1, etc decoding is
 * done by external libraries.
 * If someone wants to do a standalone build, they can do it by simply
 * removing these defines (and the references to the libraries in the Makefile) */
#define VGM_USE_VORBIS

/* can be disabled to decode with FFmpeg instead */
#ifndef VGM_DISABLE_MPEG
#define VGM_USE_MPEG
#endif

/* disabled by default, defined on compile-time for builds that support it*/
//#define VGM_USE_G7221
//#define VGM_USE_G719
//#define VGM_USE_MP4V2
//#define VGM_USE_FDKAAC
//#define VGM_USE_MAIATRAC3PLUS
//#define VGM_USE_FFMPEG

#ifdef VGM_USE_VORBIS
#include <vorbis/vorbisfile.h>
#endif

#ifdef VGM_USE_MPEG
#include <mpg123.h>
#endif

#ifdef VGM_USE_G7221
#include "g7221.h"
#endif
#ifdef VGM_USE_G719
#include "g719.h"
#endif

#ifdef VGM_USE_MP4V2
#define MP4V2_NO_STDINT_DEFS
#include <mp4v2/mp4v2.h>
#endif

#ifdef VGM_USE_FDKAAC
#include <aacdecoder_lib.h>
#endif

#ifdef VGM_USE_MAIATRAC3PLUS
#include "maiatrac3plus.h"
#endif

#ifdef VGM_USE_FFMPEG
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#endif

#include "coding/g72x_state.h"
#include "coding/acm_decoder.h"
#include "coding/nwa_decoder.h"
#include "clHCA.h"


/* The encoding type specifies the format the sound data itself takes */
typedef enum {
    /* 16-bit PCM */
    coding_PCM16LE,         /* little endian 16-bit PCM */
    coding_PCM16LE_int,		/* little endian 16-bit PCM with sample-level interleave */
    coding_PCM16LE_XOR_int, /* little endian 16-bit PCM with sample-level xor */
    coding_PCM16BE,         /* big endian 16-bit PCM */

    /* 8-bit PCM */
    coding_PCM8,            /* 8-bit PCM */
    coding_PCM8_int,        /* 8-Bit PCM with sample-level interleave */
    coding_PCM8_U,          /* 8-bit PCM, unsigned (0x80 = 0) */
    coding_PCM8_U_int,      /* 8-bit PCM, unsigned (0x80 = 0) with sample-level interleave */
    coding_PCM8_SB_int,     /* 8-bit PCM, sign bit (others are 2's complement) with sample-level interleave */

    /* 4-bit ADPCM */
    coding_CRI_ADX,         /* CRI ADX */
    coding_CRI_ADX_enc_8,   /* CRI ADX, type 8 encryption (God Hand) */
    coding_CRI_ADX_enc_9,   /* CRI ADX, type 9 encryption (PSO2) */

    coding_NGC_DSP,         /* Nintendo DSP ADPCM */
    coding_NGC_DTK,         /* Nintendo DTK ADPCM (hardware disc), also called TRK or ADP */
    coding_NGC_AFC,         /* Nintendo AFC ADPCM */

    coding_G721,            /* CCITT G.721 */

    coding_XA,              /* CD-ROM XA */
    coding_PSX,				/* Sony PS ADPCM (VAG) */
    coding_PSX_badflags,    /* Sony PS ADPCM with garbage in the flag byte */
    coding_PSX_bmdx,        /* Sony PS ADPCM with BMDX encryption */
    coding_PSX_cfg,         /* Sony PS ADPCM with configurable frame size (FF XI, SGXD type 5, Bizarre Creations) */
    coding_HEVAG,           /* Sony PSVita ADPCM */

    coding_EA_XA,			/* Electronic Arts XA ADPCM */
    coding_EA_ADPCM,		/* Electronic Arts R1 ADPCM */
	coding_MAXIS_ADPCM,		/* Maxis ADPCM */
	coding_NDS_PROCYON,     /* Procyon Studio ADPCM */

    coding_XBOX,            /* XBOX IMA ADPCM */
    coding_INT_XBOX,        /* XBOX IMA ADPCM (interleaved) */
    coding_IMA,             /* IMA ADPCM (low nibble first) */
    coding_INT_IMA,         /* IMA ADPCM (interleaved) */
    coding_DVI_IMA,         /* DVI IMA ADPCM (high nibble first), aka ADP4 */
    coding_INT_DVI_IMA,		/* DVI IMA ADPCM (Interleaved) */
    coding_NDS_IMA,         /* IMA ADPCM w/ NDS layout */
    coding_EACS_IMA,
    coding_MS_IMA,          /* Microsoft IMA */
    coding_RAD_IMA,         /* "Radical ADPCM" IMA */
    coding_RAD_IMA_mono,    /* "Radical ADPCM" IMA, mono (for interleave) */
    coding_APPLE_IMA4,      /* Apple Quicktime IMA4 */
    coding_DAT4_IMA,        /* Eurocom 'DAT4' IMA ADPCM */
    coding_SNDS_IMA,        /* Heavy Iron Studios .snds IMA ADPCM */
    coding_OTNS_IMA,        /* Omikron The Nomad Soul IMA ADPCM */
    coding_FSB_IMA,         /* FMOD's FSB multichannel IMA ADPCM */

    coding_WS,              /* Westwood Studios VBR ADPCM */
    coding_MSADPCM,         /* Microsoft ADPCM */
    coding_AICA,            /* Yamaha AICA ADPCM */
    coding_L5_555,          /* Level-5 0x555 ADPCM */
    coding_SASSC,           /* Activision EXAKT SASSC DPCM */
    coding_LSF,             /* lsf ADPCM (Fastlane Street Racing iPhone)*/
    coding_MTAF,            /* Konami MTAF ADPCM (IMA-derived) */

    /* others */
    coding_SDX2,            /* SDX2 2:1 Squareroot-Delta-Exact compression DPCM */
    coding_SDX2_int,        /* SDX2 2:1 Squareroot-Delta-Exact compression with sample-level interleave */
    coding_CBD2,            /* CBD2 2:1 Cuberoot-Delta-Exact compression DPCM */
    coding_CBD2_int,        /* CBD2 2:1 Cuberoot-Delta-Exact compression, with sample-level interleave  */

    coding_ACM,             /* InterPlay ACM */

    coding_NWA0,            /* Visual Art's NWA (compressed at various levels) */
    coding_NWA1,
    coding_NWA2,
    coding_NWA3,
    coding_NWA4,
    coding_NWA5,

    coding_CRI_HCA,         /* CRI High Compression Audio (MDCT-based) */

#ifdef VGM_USE_VORBIS
    coding_ogg_vorbis,      /* Xiph Vorbis (MDCT-based) */
#endif

#ifdef VGM_USE_MPEG
    coding_fake_MPEG2_L2,   /* MPEG-2 Layer 2 (AHX), with lying headers */
    /* I don't even know offhand if all these combinations exist... */
    coding_MPEG1_L1,
    coding_MPEG1_L2,
    coding_MPEG1_L3,        /* good ol' MPEG-1 Layer 3 (MP3) */
    coding_MPEG2_L1,
    coding_MPEG2_L2,
    coding_MPEG2_L3,
    coding_MPEG25_L1,
    coding_MPEG25_L2,
    coding_MPEG25_L3,
#endif

#ifdef VGM_USE_G7221
    coding_G7221,           /* ITU G.722.1 (Polycom Siren 7) */
    coding_G7221C,          /* ITU G.722.1 annex C (Polycom Siren 14) */
#endif

#ifdef VGM_USE_G719
    coding_G719,            /* ITU G.719 annex B (Polycom Siren 22) */
#endif

#if defined(VGM_USE_MP4V2) && defined(VGM_USE_FDKAAC)
	coding_MP4_AAC,         /* AAC (MDCT-based) */
#endif

#ifdef VGM_USE_MAIATRAC3PLUS
	coding_AT3plus,         /* Sony ATRAC3plus (MDCT-based) */
#endif

#ifdef VGM_USE_FFMPEG
    coding_FFmpeg,          /* Formats handled by FFmpeg (ATRAC3, XMA, AC3, etc) */
#endif
} coding_t;

/* The layout type specifies how the sound data is laid out in the file */
typedef enum {
    /* generic */
    layout_none,            /* straight data */

    /* interleave */
    layout_interleave,      /* equal interleave throughout the stream */
    layout_interleave_shortblock, /* interleave with a short last block */
    layout_interleave_byte,  /* full byte interleave  */

    /* headered blocks */
    layout_ast_blocked,
    layout_halpst_blocked,
    layout_xa_blocked,
    layout_ea_blocked,
    layout_eacs_blocked,
    layout_caf_blocked,
    layout_wsi_blocked,
    layout_str_snds_blocked,
    layout_ws_aud_blocked,
    layout_matx_blocked,
    layout_de2_blocked,
    layout_xvas_blocked,
    layout_vs_blocked,
    layout_emff_ps2_blocked,
    layout_emff_ngc_blocked,
    layout_gsb_blocked,
    layout_thp_blocked,
    layout_filp_blocked,
    layout_psx_mgav_blocked,
    layout_ps2_adm_blocked,
    layout_dsp_bdsp_blocked,
    layout_mxch_blocked,
    layout_ivaud_blocked,   /* GTA IV .ivaud blocks */
    layout_tra_blocked,     /* DefJam Rapstar .tra blocks */
    layout_ps2_iab_blocked,
    layout_ps2_strlr_blocked,

    /* otherwise odd */
    layout_acm,             /* libacm layout */
    layout_mus_acm,         /* mus has multi-files to deal with */
    layout_aix,             /* CRI AIX's wheels within wheels */
    layout_aax,             /* CRI AAX's wheels within databases */
	layout_scd_int,         /* deinterleave done by the SCDINTSTREAMFILE */

#ifdef VGM_USE_VORBIS
    layout_ogg_vorbis,      /* ogg vorbis file */
#endif
#ifdef VGM_USE_MPEG
    layout_fake_mpeg,       /* MPEG audio stream with bad frame headers (AHX) */
    layout_mpeg,            /* proper MPEG audio stream */
#endif
} layout_t;

/* The meta type specifies how we know what we know about the file.
 * We may know because of a header we read, some of it may have been guessed from filenames, etc. */
typedef enum {
    /* DSP-specific */
    meta_DSP_STD,           /* Nintendo standard GC ADPCM (DSP) header */
    meta_DSP_CSMP,          /* Retro: Metroid Prime 3, Donkey Kong Country Returns */
    meta_DSP_CSTR,          /* Star Fox Assault "Cstr" */
    meta_DSP_RS03,          /* Retro: Metroid Prime 2 "RS03" */
    meta_DSP_STM,           /* Paper Mario 2 STM */
    meta_DSP_AGSC,          /* Retro: Metroid Prime 2 title */
    meta_DSP_MPDSP,         /* Monopoly Party single header stereo */
    meta_DSP_JETTERS,       /* Bomberman Jetters .dsp */
    meta_DSP_MSS,           /* ? */
    meta_DSP_GCM,           /* ? */
    meta_DSP_STR,			/* Conan .str files */
    meta_DSP_SADB,          /* .sad */
    meta_DSP_WSI,           /* .wsi */
    meta_DSP_AMTS,			/* .amts */
    meta_DSP_WII_IDSP,		/* .gcm with IDSP header */
    meta_DSP_WII_MUS,       /* .mus */
    meta_DSP_WII_WSD,		/* Phantom Brave (WII) */
    meta_WII_NDP,		    /* Vertigo (Wii) */
	meta_DSP_YGO,           /* Konami: Yu-Gi-Oh! The Falsebound Kingdom (NGC), Hikaru no Go 3 (NGC) */

    /* Nintendo */
    meta_STRM,              /* Nintendo STRM */
    meta_RSTM,              /* Nintendo RSTM (similar to STRM) */
    meta_AFC,               /* AFC */
    meta_AST,               /* AST */
    meta_RWSD,              /* single-stream RWSD */
    meta_RWAR,              /* single-stream RWAR */
    meta_RWAV,              /* contents of RWAR */
    meta_CWAV,              /* contents of CWAR */
	meta_FWAV,				/* contents of FWAR */
    meta_RSTM_SPM,          /* RSTM with 44->22khz hack */
    meta_THP,               /* THP movie files */
    meta_RSTM_shrunken,     /* Atlus' mutant shortened RSTM */
	meta_NDS_SWAV,		    /* Asphalt Urban GT 1 & 2 */
	meta_NDS_RRDS,		    /* Ridge Racer DS */
    meta_WII_BNS,           /* Wii BNS Banner Sound (similar to RSTM) */
    meta_STX,               /* Pikmin .stx */
	meta_WIIU_BTSND,		/* Wii U Boot Sound */

    meta_ADX_03,            /* CRI ADX "type 03" */
    meta_ADX_04,            /* CRI ADX "type 04" */
    meta_ADX_05,            /* CRI ADX "type 05" */
    meta_AIX,               /* CRI AIX */
    meta_AAX,               /* CRI AAX */
    meta_UTF_DSP,           /* CRI ADPCM_WII, like AAX with DSP */

    meta_NGC_ADPDTK,        /* NGC DTK/ADP (.adp/dkt DTK) [no header_id] */
    meta_kRAW,              /* almost headerless PCM */
    meta_RSF,               /* Retro Studios RSF (Metroid Prime .rsf) [no header_id] */
    meta_HALPST,            /* HAL Labs HALPST */
    meta_GCSW,              /* GCSW (PCM) */
    meta_CFN,				/* Namco CAF Audio File */
    meta_MYSPD,             /* U-Sing .myspd */
    meta_HIS,               /* Her Ineractive .his */
    meta_BNSF,              /* Bandai Namco Sound Format */

    meta_PSX_XA,            /* CD-ROM XA with RIFF header */
    meta_PS2_SShd,			/* .ADS with SShd header */
    meta_PS2_NPSF,			/* Namco Production Sound File */
    meta_PS2_RXW,			/* Sony Arc The Lad Sound File */
    meta_PS2_RAW,			/* RAW Interleaved Format */
    meta_PS2_EXST,			/* Shadow of Colossus EXST */
    meta_PS2_SVAG,			/* Konami SVAG */
    meta_PS2_MIB,			/* MIB File */
    meta_PS2_MIB_MIH,		/* MIB File + MIH Header*/
    meta_PS2_MIC,			/* KOEI MIC File */
    meta_PS2_VAGi,			/* VAGi Interleaved File */
    meta_PS2_VAGp,			/* VAGp Mono File */
    meta_PS2_VAGm,			/* VAGp Mono File */
    meta_PS2_pGAV,			/* VAGp with Little Endian Header */
    meta_PSX_GMS,           /* GMS File (used in PS1 & PS2) [no header_id] */
    meta_PS2_STR,			/* Pacman STR+STH files */
    meta_PS2_ILD,			/* ILD File */
    meta_PS2_PNB,			/* PsychoNauts Bgm File */
    meta_PS2_VAGs,			/* VAG Stereo from Kingdom Hearts */
    meta_PS2_VPK,			/* VPK Audio File */
    meta_PS2_BMDX,          /* Beatmania thing */
    meta_PS2_IVB,           /* Langrisser 3 IVB */
    meta_PS2_SND,           /* some Might & Magics SSND header */
    meta_PS2_SVS,           /* Square SVS */
    meta_XSS,				/* Dino Crisis 3 */
    meta_SL3,				/* Test Drive Unlimited */
    meta_HGC1,				/* Knights of the Temple 2 */
    meta_AUS,				/* Various Capcom games */
    meta_RWS,				/* Various Konami games */
    meta_FSB1,              /* FMOD Sample Bank, version 1 */
    meta_FSB2,              /* FMOD Sample Bank, version 2 */
    meta_FSB3,              /* FMOD Sample Bank, version 3.0/3.1 */
    meta_FSB4,              /* FMOD Sample Bank, version 4 */
    meta_FSB5,              /* FMOD Sample Bank, version 5 */
    meta_RWX,				/* Air Force Delta Storm (XBOX) */
    meta_XWB,				/* King of Fighters (XBOX) */
    meta_XA30,				/* Driver - Parallel Lines (PS2) */
    meta_MUSC,				/* Spyro Games, possibly more */
    meta_MUSX_V004,			/* Spyro Games, possibly more */
    meta_MUSX_V005,			/* Spyro Games, possibly more */
    meta_MUSX_V006,			/* Spyro Games, possibly more */
    meta_MUSX_V010,			/* Spyro Games, possibly more */
    meta_MUSX_V201,			/* Sphinx and the cursed Mummy */
    meta_LEG,				/* Legaia 2 [no header_id] */
    meta_FILP,				/* Resident Evil - Dead Aim */
    meta_IKM,				/* Zwei! */
    meta_SFS,				/* Baroque */
    meta_BG00,				/* Ibara, Mushihimesama */
    meta_PS2_RSTM,			/* Midnight Club 3 */
    meta_PS2_KCES,			/* Dance Dance Revolution */
    meta_PS2_DXH,			/* Tokobot Plus - Myteries of the Karakuri */
    meta_PS2_PSH,			/* Dawn of Mana - Seiken Densetsu 4 */
    meta_PCM_SCD,			/* Lunar - Eternal Blue */
	meta_PCM_PS2,			/* Konami: Ephemeral Fantasia, Yu-Gi-Oh! The Duelists of the Roses */
    meta_PS2_RKV,			/* Legacy of Kain - Blood Omen 2 */
    meta_PS2_PSW,			/* Rayman Raving Rabbids */
    meta_PS2_VAS,			/* Pro Baseball Spirits 5 */
    meta_PS2_TEC,			/* TECMO badflagged stream */
    meta_PS2_ENTH,			/* Enthusia */
    meta_SDT,				/* Baldur's Gate - Dark Alliance */
    meta_NGC_TYDSP,			/* Ty - The Tasmanian Tiger */
    meta_NGC_SWD,			/* Conflict - Desert Storm 1 & 2 */
    meta_CAPDSP,            /* Capcom DSP Header [no header_id] */
    meta_DC_STR,			/* SEGA Stream Asset Builder */
    meta_DC_STR_V2,			/* variant of SEGA Stream Asset Builder */
    meta_NGC_BH2PCM,		/* Bio Hazard 2 */
    meta_SAT_SAP,			/* Bubble Symphony */
    meta_DC_IDVI,			/* Eldorado Gate */
    meta_KRAW,				/* Geometry Wars - Galaxies */
    meta_PS2_OMU,			/* PS2 Int file with Header */
    meta_PS2_XA2,			/* XG3 Extreme-G Racing */
    meta_IDSP,				/* Chronicles of Narnia, Soul Calibur Legends, Mario Strikers Charged */
	meta_SPT_SPD,			/* Various (SPT+SPT DSP) */
    meta_ISH_ISD,			/* Various (ISH+ISD DSP) */
    meta_GSP_GSB,			/* Tecmo games (Super Swing Golf 1 & 2, Quamtum Theory) */
    meta_YDSP,				/* WWE Day of Reckoning */
    meta_FFCC_STR,          /* Final Fantasy: Crystal Chronicles */
    
    meta_WAA_WAC_WAD_WAM,	/* Beyond Good & Evil */
    meta_GCA,				/* Metal Slug Anthology */
    meta_MSVP,				/* Popcap Hits */
    meta_NGC_SSM,			/* Golden Gashbell Full Power */
    meta_PS2_JOE,			/* Wall-E / Pixar games */

    meta_NGC_YMF,			/* WWE WrestleMania X8 */
    meta_SADL,              /* .sad */
    meta_PS2_CCC,           /* Tokyo Xtreme Racer DRIFT 2 */
    meta_PSX_FAG,           /* Jackie Chan - Stuntmaster */
    meta_PS2_MIHB,          /* Merged MIH+MIB */
    meta_NGC_PDT,           /* Mario Party 6 */
    meta_DC_ASD,    		/* Miss Moonligh */
    meta_NAOMI_SPSD,		/* Guilty Gear X */
    
    meta_RSD2VAG,			/* RSD2VAG */
    meta_RSD2PCMB,			/* RSD2PCMB */
    meta_RSD2XADP,			/* RSD2XADP */
	meta_RSD3VAG,			/* RSD3VAG */
	meta_RSD3GADP,			/* RSD3GADP */
    meta_RSD3PCM,		  	/* RSD3PCM */
    meta_RSD3PCMB,			/* RSD3PCMB */
    meta_RSD4PCMB,			/* RSD4PCMB */
    meta_RSD4PCM,			/* RSD4PCM */
	meta_RSD4RADP,			/* RSD4RADP */
    meta_RSD4VAG,			/* RSD4VAG */
    meta_RSD6VAG,			/* RSD6VAG */
    meta_RSD6WADP,			/* RSD6WADP */
    meta_RSD6XADP,			/* RSD6XADP */
    meta_RSD6RADP,			/* RSD6RADP */
	meta_RSD6OOGV,          /* RSD6OOGV */

    meta_PS2_ASS,			/* ASS */
    meta_PS2_SEG,			/* Eragon */
    meta_XBOX_SEG,          /* Eragon */
    meta_NDS_STRM_FFTA2,	/* Final Fantasy Tactics A2 */
    meta_STR_ASR,			/* Donkey Kong Jet Race */
    meta_ZWDSP,				/* Zack and Wiki */
    meta_VGS,				/* Guitar Hero Encore - Rocks the 80s */
    meta_DC_DCSW_DCS,		/* Evil Twin - Cypriens Chronicles (DC) */
    meta_WII_SMP,			/* Mushroom Men - The Spore Wars */
    meta_WII_SNG,           /* Excite Trucks */
    meta_EMFF_PS2,			/* Eidos Music File Format for PS2*/
    meta_EMFF_NGC,			/* Eidos Music File Format for NGC/WII */
    meta_SAT_BAKA,			/* Crypt Killer */
    meta_PS2_VSF,           /* Musashi: Samurai Legend */
	meta_PS2_VSF_TTA,       /* Tiny Toon Adventures: Defenders of the Universe */
	meta_ADS,               /* Gauntlet Dark Legends (GC) */
	meta_PS2_SPS,           /* Ape Escape 2 */
    meta_PS2_XA2_RRP,       /* RC Revenge Pro */
    meta_PS2_STM,           /* Red Dead Revolver .stm, renamed .ps2stm */
    meta_NGC_DSP_KONAMI,    /* Konami DSP header, found in various games */
	meta_UBI_CKD,           /* Ubisoft CKD RIFF header from Rayman Origins */

    meta_XBOX_WAVM,			/* XBOX WAVM File */
    meta_XBOX_RIFF,			/* XBOX RIFF/WAVE File */
    meta_XBOX_WVS,			/* XBOX WVS */
    meta_NGC_WVS,			/* Metal Arms - Glitch in the System */
    meta_XBOX_STMA,			/* XBOX STMA */
    meta_XBOX_MATX,			/* XBOX MATX */
    meta_XBOX_XMU,			/* XBOX XMU */
    meta_XBOX_XVAS,			/* XBOX VAS */
    
    meta_EAXA_R2,			/* EA XA Release 2 */
    meta_EAXA_R3,			/* EA XA Release 3 */
    meta_EAXA_PSX,			/* EA with PSX ADPCM */
    meta_EACS_PC,			/* EACS PC */
    meta_EACS_PSX,			/* EACS PSX */
    meta_EACS_SAT,			/* EACS SATURN */
    meta_EA_ADPCM,			/* EA header using XA ADPCM */
    meta_EA_IMA,			/* EA header using IMA */
    meta_EA_PCM,			/* EA header using PCM */

    meta_RAW,				/* RAW PCM file */

    meta_GENH,              /* generic header */

    meta_AIFC,              /* Audio Interchange File Format AIFF-C */
    meta_AIFF,              /* Audio Interchange File Format */
    meta_STR_SNDS,          /* .str with SNDS blocks and SHDR header */
    meta_WS_AUD,            /* Westwood Studios .aud */
    meta_WS_AUD_old,        /* Westwood Studios .aud, old style */
    meta_RIFF_WAVE,         /* RIFF, for WAVs */
    meta_RIFF_WAVE_POS,     /* .wav + .pos for looping */
    meta_RIFF_WAVE_labl,    /* RIFF w/ loop Markers in LIST-adtl-labl */
    meta_RIFF_WAVE_smpl,    /* RIFF w/ loop data in smpl chunk */
    meta_RIFF_WAVE_MWV,     /* .mwv RIFF w/ loop data in ctrl chunk pflt */
    meta_RIFF_WAVE_SNS,     /* .sns RIFF */
    meta_RIFX_WAVE,         /* RIFX, for big-endian WAVs */
    meta_RIFX_WAVE_smpl,    /* RIFX w/ loop data in smpl chunk */
    meta_XNBm,              /* XNBm, which has a RIFF fmt chunk */
    meta_PC_MXST,           /* Lego Island MxSt */
	meta_PC_SOB_SAB,		/* Worms 4 Mayhem SOB+SAB file */
    meta_NWA,               /* Visual Art's NWA */
    meta_NWA_NWAINFOINI,    /* Visual Art's NWA w/ NWAINFO.INI for looping */
    meta_NWA_GAMEEXEINI,    /* Visual Art's NWA w/ Gameexe.ini for looping */
    meta_DVI,				/* DVI Interleaved */
    meta_KCEY,				/* KCEYCOMP */
    meta_ACM,               /* InterPlay ACM header */
    meta_MUS_ACM,           /* MUS playlist of InterPlay ACM files */
    meta_DE2,               /* Falcom (Gurumin) .de2 */
    meta_VS,				/* Men in Black .vs */
    meta_FFXI_BGW,          /* FFXI BGW */
    meta_FFXI_SPW,          /* FFXI SPW */
    meta_STS_WII,			/* Shikigami No Shiro 3 STS Audio File */
    meta_PS2_P2BT,			/* Pop'n'Music 7 Audio File */
    meta_PS2_GBTS,			/* Pop'n'Music 9 Audio File */
    meta_NGC_DSP_IADP,      /* Gamecube Interleave DSP */
	meta_PS2_TK5,			/* Tekken 5 Stream Files */
	meta_WII_STR,			/* House of The Dead Overkill STR+STH */
	meta_PS2_MCG,			/* Gunvari MCG Files (was name .GCM on disk) */
    meta_ZSD,               /* Dragon Booster ZSD */
    meta_RedSpark,          /* "RedSpark" RSD (MadWorld) */
	meta_PC_IVAUD,			/* .ivaud GTA IV */
    meta_NDS_HWAS,			/* Spider-Man 3, Tony Hawk's Downhill Jam, possibly more... */
	meta_NGC_LPS,			/* Rave Master (Groove Adventure Rave)(GC) */
    meta_NAOMI_ADPCM,		/* NAOMI/NAOMI2 ARcade games */
	meta_SD9,               /* beatmaniaIIDX16 - EMPRESS (Arcade) */
	meta_2DX9,              /* beatmaniaIIDX16 - EMPRESS (Arcade) */
    meta_PS2_VGV,           /* Rune: Viking Warlord */
    meta_NGC_GCUB,          /* Sega Soccer Slam */
    meta_MAXIS_XA,          /* Sim City 3000 (PC) */
    meta_NGC_SCK_DSP,       /* Scorpion King (NGC) */
    meta_CAFF,              /* iPhone .caf */
    meta_EXAKT_SC,          /* Activision EXAKT .SC (PS2) */
    meta_WII_WAS,           /* DiRT 2 (WII) */
    meta_PONA_3DO,          /* Policenauts (3DO) */
    meta_PONA_PSX,          /* Policenauts (PSX) */
    meta_XBOX_HLWAV,        /* Half Life 2 (XBOX) */
	meta_PS2_AST,			/* Some KOEI game (PS2) */
	meta_DMSG,				/* Nightcaster II - Equinox (XBOX) */
    meta_NGC_DSP_AAAP,  	/* Turok: Evolution (NGC), Vexx (NGC) */
    meta_PS2_STER,          /* Juuni Kokuki: Kakukaku Taru Ou Michi Beni Midori no Uka */
    meta_PS2_WB,            /* Shooting Love. ~TRIZEAL~ */
    meta_S14,               /* raw Siren 14, 24kbit mono */
    meta_SSS,               /* raw Siren 14, 48kbit stereo */
    meta_PS2_GCM,           /* NamCollection */
    meta_PS2_SMPL,          /* Homura */
    meta_PS2_MSA,           /* Psyvariar -Complete Edition- */
    meta_PS2_VOI,           /* RAW Danger (Zettaizetsumei Toshi 2 - Itetsuita Kiokutachi) [PS2] */
    meta_PS2_KHV,           /* Kingdom Hearts 2 VAG streams */
    meta_PC_SMP,            /* Ghostbusters PC .smp */
    meta_P3D,               /* Prototype P3D */
	meta_PS2_TK1,           /* Tekken (NamCollection) */
    meta_PS2_ADSC,          /* Kenka Bancho 2: Full Throttle */
    meta_NGC_BO2,           /* Blood Omen 2 (NGC) */
    meta_DSP_DDSP,          /* Various (2 dsp files stuck together */
    meta_NGC_DSP_MPDS,      /* Big Air Freestyle, Terminator 3 */
    meta_DSP_STR_IG,        /* Micro Machines, Superman Superman: Shadow of Apokolis */
    meta_PSX_MGAV,          /* Future Cop L.A.P.D. */
    meta_NGC_DSP_STH_STR,   /* SpongeBob Squarepants (NGC), Taz Wanted (NGC), Cubix (NGC), Tak (WII)*/
    meta_PS2_B1S,           /* 7 Wonders of the ancient world */
    meta_PS2_WAD,           /* The golden Compass */
    meta_DSP_XIII,          /* XIII, possibly more (Ubisoft header???) */
    meta_DSP_CABELAS,       /* Cabelas games */
    meta_PS2_ADM,           /* Dragon Quest 5 */
	meta_PS2_LPCM,          /* Ah! My Goddess */
    meta_DSP_BDSP,          /* Ah! My Goddess */
	meta_PS2_VMS,           /* Autobahn Raser - Police Madness */
	meta_PS2_XAU,			/* Spectral Force Chronicle */
    meta_GH3_BAR,           /* Guitar Hero III Mobile .bar */
    meta_FFW,               /* Freedom Fighters [NGC] */
    meta_DSP_DSPW,          /* Sengoku Basara 3 [WII] */
    meta_PS2_JSTM,          /* Tantei Jinguji Saburo - Kind of Blue (PS2) */
    meta_SQEX_SCD,          /* Square-Enix SCD */
    meta_NGC_NST_DSP,       /* Animaniacs [NGC] */
    meta_BAF,               /* Bizarre Creations (Blur, James Bond) */
	meta_PS3_XVAG,          /* Ratchet & Clank Future: Quest for Booty (PS3) */
	meta_PS3_CPS,           /* Eternal Sonata (PS3) */
    meta_PS3_MSF,           /* MSF header */
	meta_NUB_VAG,           /* VAG from Nub archives */
	meta_PS3_PAST,          /* Bakugan Battle Brawlers (PS3) */
    meta_SGXD,              /* Sony: Folklore, Genji, Tokyo Jungle (PS3), Brave Story, Kurohyo (PSP)  */
	meta_NGCA,              /* GoldenEye 007 (Wii) */
	meta_WII_RAS,           /* Donkey Kong Country Returns (Wii) */
	meta_PS2_SPM,           /* Lethal Skies Elite Pilot: Team SW */
	meta_X360_TRA,			/* Def Jam Rapstar */
	meta_PS2_VGS,			/* Princess Soft PS2 games */
	meta_PS2_IAB,			/* Ueki no Housoku - Taosu ze Robert Juudan!! (PS2) */
	meta_PS2_STRLR,         /* The Bouncer */
    meta_LSF_N1NJ4N,        /* .lsf n1nj4n Fastlane Street Racing (iPhone) */
    meta_VAWX,              /* feelplus: No More Heroes Heroes Paradise, Moon Diver */
    meta_PC_SNDS,           // Incredibles PC .snds
    meta_PS2_WMUS,          // The Warriors (PS2)
    meta_HYPERSCAN_KVAG,	// Hyperscan KVAG/BVG 
    meta_IOS_PSND,          // Crash Bandicoot Nitro Kart 2 (iOS)
    meta_BOS_ADP,           // ADP! (Balls of Steel, PC)
    meta_OTNS_ADP,          // Omikron: The Nomad Soul .adp (PC/DC)
    meta_EB_SFX,            // Excitebots .sfx
    meta_EB_SF0,            // Excitebots .sf0
	meta_PS3_KLBS,          // L@VE ONCE (PS3)
    meta_PS2_MTAF,          // Metal Gear Solid 3 MTAF
    meta_PS2_VAG1,          // Metal Gear Solid 3 VAG1
    meta_PS2_VAG2,          // Metal Gear Solid 3 VAG2
	meta_TUN,               // LEGO Racers (PC)
	meta_WPD,               // Shuffle! (PC)
	meta_MN_STR,            // Mini Ninjas (PC/PS3/WII)
	meta_PS2_MSS,			// Guerilla: ShellShock Nam '67, Killzone (PS2)
	meta_PS2_HSF,			// Lowrider (PS2)
	meta_PS3_IVAG,			// Interleaved VAG files (PS3)
	meta_PS2_2PFS,			// Konami: Mahoromatic: Moetto - KiraKira Maid-San, GANTZ (PS2)
	meta_PS2_VBK,           // Disney's Stitch - Experiment 626
    meta_OTM,               // Otomedius (Arcade)
    meta_CSTM,              // Nintendo 3DS CSTM
    meta_FSTM,              // Nintendo Wii U FSTM
    meta_3DS_IDSP,          // Nintendo 3DS/Wii U IDSP
    meta_KT_WIIBGM,         // Koei Tecmo WiiBGM
    meta_MCA,               // Capcom MCA "MADP"
    meta_XB3D_ADX,          // Xenoblade Chronicles 3D ADX
    meta_HCA,               /* CRI HCA */
    meta_PS2_SVAG_SNK,      /* SNK PS2 SVAG */
    meta_PS2_VDS_VDM,       /* Graffiti Kingdom */
    meta_X360_CXS,          /* Eternal Sonata (Xbox 360) */
    meta_AKB,               /* SQEX iOS */

#ifdef VGM_USE_VORBIS
    meta_OGG_VORBIS,        /* Ogg Vorbis */
    meta_OGG_SLI,           /* Ogg Vorbis file w/ companion .sli for looping */
    meta_OGG_SLI2,          /* Ogg Vorbis file w/ different styled .sli for looping */
    meta_OGG_SFL,           /* Ogg Vorbis file w/ .sfl (RIFF SFPL) for looping */
    meta_OGG_UM3,           /* Ogg Vorbis with first 0x800 bytes XOR 0xFF */
    meta_OGG_KOVS,          /* Ogg Vorbis with exta header and 0x100 bytes XOR */
    meta_OGG_PSYCH,         /* Ogg Vorbis with all bytes -0x23*/
#endif
#ifdef VGM_USE_MPEG
    meta_AHX,               /* CRI AHX header (same structure as ADX) */
#endif
#ifdef VGM_USE_MP4V2
    meta_MP4,               /* AAC (iOS) */
#endif
#ifdef VGM_USE_FFMPEG
    meta_FFmpeg,
#endif
} meta_t;


/* info for a single vgmstream channel */
typedef struct {
    STREAMFILE * streamfile; /* file used by this channel */
    off_t channel_start_offset; /* where data for this channel begins */
    off_t offset;           /* current location in the file */

    off_t frame_header_offset;  /* offset of the current frame header (for WS) */
    int samples_left_in_frame;  /* for WS */

    /* format specific */

    /* adpcm */
    int16_t adpcm_coef[16]; /* for formats with decode coefficients built in */
    int32_t adpcm_coef_3by32[0x60];     /* for Level-5 0x555 */
    union {
        int16_t adpcm_history1_16;  /* previous sample */
        int32_t adpcm_history1_32;
    };
    union {
        int16_t adpcm_history2_16;  /* previous previous sample */
        int32_t adpcm_history2_32;
    };
    union {
        int16_t adpcm_history3_16;
        int32_t adpcm_history3_32;
    };
    union {
        int16_t adpcm_history4_16;
        int32_t adpcm_history4_32;
    };

	double adpcm_history1_double;
	double adpcm_history2_double;

    int adpcm_step_index;       /* for IMA */
    int adpcm_scale;            /* for MS ADPCM */

    /* state for G.721 decoder, sort of big but we might as well keep it around */
    struct g72x_state g72x_state;

    /* ADX encryption */
    int adx_channels;
    uint16_t adx_xor;
    uint16_t adx_mult;
    uint16_t adx_add;

    /* BMDX encryption */
    uint8_t bmdx_xor;
    uint8_t bmdx_add;
    
    /* generic encryption */
    uint16_t key_xor;
} VGMSTREAMCHANNEL;

/* main vgmstream info */
typedef struct {
    /* basics */
    int32_t num_samples;    /* the actual number of samples in this stream */
    int32_t sample_rate;    /* sample rate in Hz */
    int channels;           /* number of channels */
    coding_t coding_type;   /* type of encoding */
    layout_t layout_type;   /* type of layout for data */
    meta_t meta_type;       /* how we know the metadata */
    int num_streams;        /* info only, for a few multi-stream formats (0=not set/one, 1=one stream) */

    /* looping */
    int loop_flag;          /* is this stream looped? */
    int32_t loop_start_sample; /* first sample of the loop (included in the loop) */
    int32_t loop_end_sample; /* last sample of the loop (not included in the loop) */

    /* channels */
    VGMSTREAMCHANNEL * ch;   /* pointer to array of channels */

    /* channel copies */
    VGMSTREAMCHANNEL * start_ch;    /* copies of channel status as they were at the beginning of the stream */
    VGMSTREAMCHANNEL * loop_ch;     /* copies of channel status as they were at the loop point */

    /* layout-specific */
    int32_t current_sample;         /* number of samples we've passed */
    int32_t samples_into_block;     /* number of samples into the current block */
    /* interleave */
    size_t interleave_block_size;   /* interleave for this file */
    size_t interleave_smallblock_size;  /* smaller interleave for last block */
    /* headered blocks */
    off_t current_block_offset;     /* start of this block (offset of block header) */
    size_t current_block_size;      /* size of the block we're in now */
    off_t next_block_offset;        /* offset of header of the next block */
	int	block_count;				/* count of "semi" block in total block */

    int hit_loop;                   /* have we seen the loop yet? */

    /* loop layout (saved values) */
    int32_t loop_sample;            /* saved from current_sample, should be loop_start_sample... */
    int32_t loop_samples_into_block;/* saved from samples_into_block */
    off_t loop_block_offset;        /* saved from current_block_offset */
    size_t loop_block_size;         /* saved from current_block_size */
    off_t loop_next_block_offset;   /* saved from next_block_offset */

    /* decoder specific */
    uint8_t xa_channel;				/* XA ADPCM: selected channel */
    int32_t xa_sector_length;		/* XA ADPCM: XA block */
	uint8_t xa_headerless;			/* XA ADPCM: headerless XA block */

    int8_t get_high_nibble;         /* ADPCM: which nibble (XA, IMA, EA) */

    uint8_t	ea_big_endian;          /* EA ADPCM stuff */
    uint8_t	ea_compression_type;
    uint8_t	ea_compression_version;
    uint8_t	ea_platform;

    int32_t ws_output_size;         /* WS ADPCM: output bytes for this block */

    int32_t thpNextFrameSize;       /* THP */

    void * start_vgmstream;         /* a copy of the VGMSTREAM as it was at the beginning of the stream (for AAX/AIX/SCD) */

	/* Data the codec needs for the whole stream. This is for codecs too
     * different from vgmstream's structure to be reasonably shoehorned into
     * using the ch structures.
     * Note also that support must be added for resetting, looping and
     * closing for every codec that uses this, as it will not be handled. */
    void * codec_data;
} VGMSTREAM;

#ifdef VGM_USE_VORBIS
typedef struct {
    STREAMFILE *streamfile;
    ogg_int64_t offset;
    ogg_int64_t size;
    ogg_int64_t other_header_bytes;

    /* XOR setup (SCD) */
    int decryption_enabled;
    void (*decryption_callback)(void *ptr, size_t size, size_t nmemb, void *datasource, int bytes_read);
    uint8_t scd_xor;
    off_t scd_xor_length;
} ogg_vorbis_streamfile;

typedef struct {
    OggVorbis_File ogg_vorbis_file;
    int bitstream;

    ogg_vorbis_streamfile ov_streamfile;
} ogg_vorbis_codec_data;
#endif

#ifdef VGM_USE_MPEG
typedef struct {
    uint8_t *buffer; /* raw (coded) data buffer */
    size_t buffer_size;
    size_t bytes_in_buffer;
    int buffer_full; /* raw buffer has been filled */
    int buffer_used; /* raw buffer has been fed to the decoder */

    mpg123_handle *m; /* "base" MPEG stream */

    /* base values, assumed to be constant in the file */
    int sample_rate_per_frame;
    int channels_per_frame;
    size_t samples_per_frame;

    size_t samples_to_discard; /* for interleaved looping */

    /* interleaved MPEG internals */
    int interleaved; /* flag */
    mpg123_handle **ms; /* array of MPEG streams */
    size_t ms_size;
    uint8_t *frame_buffer; /* temp buffer with samples from a single decoded frame */
    size_t frame_buffer_size;
    uint8_t *interleave_buffer; /* intermediate buffer with samples from all channels */
    size_t interleave_buffer_size;
    size_t bytes_in_interleave_buffer;
    size_t bytes_used_in_interleave_buffer;

    /* messy stuff for padded FSB frames */
    size_t fixed_frame_size; /* when given a fixed size (XVAG) */
    size_t current_frame_size;
    int fsb_padding; /* for FSBs that have extra garbage between frames */
    size_t current_padding; /* padding needed for current frame size */

} mpeg_codec_data;
#endif

#ifdef VGM_USE_G7221
typedef struct {
    sample buffer[640];
    g7221_handle *handle;
} g7221_codec_data;
#endif

#ifdef VGM_USE_G719
typedef struct {
   sample buffer[960];
   g719_handle *handle;
} g719_codec_data;
#endif

#ifdef VGM_USE_MAIATRAC3PLUS
typedef struct {
	sample *buffer;
	int channels;
	int samples_discard;
	void *handle;
} maiatrac3plus_codec_data;
#endif

/* with one file this is also used for just ACM */
typedef struct {
    int file_count;
    int current_file;
    /* the index we return to upon loop completion */
    int loop_start_file;
    /* one after the index of the last file, typically
     * will be equal to file_count */
    int loop_end_file;
    /* Upon exit from a loop, which file to play. */
    /* -1 if there is no such file */
    /*int end_file;*/
    ACMStream **files;
} mus_acm_codec_data;

#define AIX_BUFFER_SIZE 0x1000
/* AIXery */
typedef struct {
    sample buffer[AIX_BUFFER_SIZE];
    int segment_count;
    int stream_count;
    int current_segment;
    /* one per segment */
    int32_t *sample_counts;
    /* organized like:
     * segment1_stream1, segment1_stream2, segment2_stream1, segment2_stream2*/
    VGMSTREAM **adxs;
} aix_codec_data;

typedef struct {
    int segment_count;
    int current_segment;
    int loop_segment;
    /* one per segment */
    int32_t *sample_counts;
    VGMSTREAM **adxs;
} aax_codec_data;

/* for compressed NWA */
typedef struct {
    NWAData *nwa;
} nwa_codec_data;

/* SQEX SCD interleaved */
typedef struct {
    int substream_count;
    VGMSTREAM **substreams;
    STREAMFILE **intfiles;
} scd_int_codec_data;

typedef struct {
    STREAMFILE *streamfile;
    uint64_t start;
    uint64_t size;
    clHCA_stInfo info;
    unsigned int curblock;
    unsigned int sample_ptr, samples_discard;
    signed short sample_buffer[clHCA_samplesPerBlock * 16];
    // clHCA exists here
} hca_codec_data;

#ifdef VGM_USE_FFMPEG
typedef struct {
    /*** init data ***/
    STREAMFILE *streamfile;
    
    // offset and total size of raw stream data
    uint64_t start;
    uint64_t size;
    
    // offset into stream, includes header_size if header exists
    uint64_t offset;
    
    // inserted header, ie. fake RIFF header
    uint8_t *header_insert_block;
    // header/fake RIFF over the real (parseable by FFmpeg) file start
    uint64_t header_size;
    
    /*** "public" API (read-only) ***/
    // stream info
    int channels;
    int bitsPerSample;
    int floatingPoint;
    int sampleRate;
    int bitrate;
    // extra info: 0 if unknown or not fixed
    int64_t totalSamples; // estimated count (may not be accurate for some demuxers)
    int64_t blockAlign; // coded block of bytes, counting channels (the block can be joint stereo)
    int64_t frameSize; // decoded samples per block
    int64_t skipSamples; // number of start samples that will be skipped (encoder delay), for looping adjustments
    int streamCount; // number of FFmpeg audio streams
    
    /*** internal state ***/
    // Intermediate byte buffer
    uint8_t *sampleBuffer;
    // max samples we can held (can be less or more than frameSize)
    size_t sampleBufferBlock;
    
    // FFmpeg context used for metadata
    AVCodec *codec;
    
    // FFmpeg decoder state
    unsigned char *buffer;
    AVIOContext *ioCtx;
    int streamIndex;
    AVFormatContext *formatCtx;
    AVCodecContext *codecCtx;
    AVFrame *lastDecodedFrame;
    AVPacket *lastReadPacket;
    int bytesConsumedFromDecodedFrame;
    int readNextPacket;
    int endOfStream;
    int endOfAudio;
    int skipSamplesSet; // flag to know skip samples were manually added from vgmstream
    
    // Seeking is not ideal, so rollback is necessary
    int samplesToDiscard;
} ffmpeg_codec_data;
#endif

#ifdef VGM_USE_MP4V2
typedef struct {
	STREAMFILE *streamfile;
	uint64_t start;
	uint64_t offset;
	uint64_t size;
} mp4_streamfile;

#ifdef VGM_USE_FDKAAC
typedef struct {
	mp4_streamfile if_file;
	MP4FileHandle h_mp4file;
	MP4TrackId track_id;
	unsigned long sampleId, numSamples;
	UINT codec_init_data_size;
	HANDLE_AACDECODER h_aacdecoder;
	unsigned int sample_ptr, samples_per_frame, samples_discard;
	INT_PCM sample_buffer[( (6) * (2048)*4 )];
} mp4_aac_codec_data;
#endif
#endif


/* -------------------------------------------------------------------------*/
/* vgmstream "public" API                                                   */
/* -------------------------------------------------------------------------*/

/* do format detection, return pointer to a usable VGMSTREAM, or NULL on failure */
VGMSTREAM * init_vgmstream(const char * const filename);

VGMSTREAM * init_vgmstream_from_STREAMFILE(STREAMFILE *streamFile);

/* reset a VGMSTREAM to start of stream */
void reset_vgmstream(VGMSTREAM * vgmstream);

/* close an open vgmstream */
void close_vgmstream(VGMSTREAM * vgmstream);

/* calculate the number of samples to be played based on looping parameters */
int32_t get_vgmstream_play_samples(double looptimes, double fadeseconds, double fadedelayseconds, VGMSTREAM * vgmstream);

/* render! */
void render_vgmstream(sample * buffer, int32_t sample_count, VGMSTREAM * vgmstream);

/* Write a description of the stream into array pointed by desc,
 * which must be length bytes long. Will always be null-terminated if length > 0 */
void describe_vgmstream(VGMSTREAM * vgmstream, char * desc, int length);

/* Return the average bitrate in bps of all unique files contained within this
 * stream. Compares files by absolute paths. */
int get_vgmstream_average_bitrate(VGMSTREAM * vgmstream);

/* -------------------------------------------------------------------------*/
/* vgmstream "private" API                                                  */
/* -------------------------------------------------------------------------*/

/* allocate a VGMSTREAM and channel stuff */
VGMSTREAM * allocate_vgmstream(int channel_count, int looped);

/* smallest self-contained group of samples is a frame */
int get_vgmstream_samples_per_frame(VGMSTREAM * vgmstream);
/* number of bytes per frame */
int get_vgmstream_frame_size(VGMSTREAM * vgmstream);
/* in NDS IMA the frame size is the block size, so the last one is short */
int get_vgmstream_samples_per_shortframe(VGMSTREAM * vgmstream);
int get_vgmstream_shortframe_size(VGMSTREAM * vgmstream);

/* Assume that we have written samples_written into the buffer already, and we have samples_to_do consecutive
 * samples ahead of us. Decode those samples into the buffer. */
void decode_vgmstream(VGMSTREAM * vgmstream, int samples_written, int samples_to_do, sample * buffer);

/* Assume additionally that we have samples_to_do consecutive samples in "data",
 * and this this is for channel number "channel" */
void decode_vgmstream_mem(VGMSTREAM * vgmstream, int samples_written, int samples_to_do, sample * buffer, uint8_t * data, int channel);

/* calculate number of consecutive samples to do (taking into account stopping for loop start and end)  */
int vgmstream_samples_to_do(int samples_this_block, int samples_per_frame, VGMSTREAM * vgmstream);

/* Detect start and save values, also detect end and restore values. Only works on exact sample values.
 * Returns 1 if loop was done. */
int vgmstream_do_loop(VGMSTREAM * vgmstream);

/* See if there is a second file which may be the second channel, given
 * already opened mono opened_stream which was opened from filename.
 * If a suitable file is found, open it and change opened_stream to a stereo stream. */
void try_dual_file_stereo(VGMSTREAM * opened_stream, STREAMFILE *streamFile);


/* Open the stream for reading at offset (standarized taking into account layouts, channels and so on).
 * returns 0 on failure */
int vgmstream_open_stream(VGMSTREAM * vgmstream, STREAMFILE *streamFile, off_t start_offset);

#endif