misc/libtremor/ivorbiscodec.h
author mikade
Thu, 01 Sep 2011 00:28:38 +0200
changeset 5720 a962d0823f49
parent 5170 f7e49eff3708
permissions -rw-r--r--
onHogAttack hook. Might reposition this later. Updates to Tumbler gameplay mode -- Better HUD -- Allow more user customization -- Bugfix for new gear spawns -- Performance tweaks -- Variety of small gameplay changes
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
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 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
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 *                                                                  *
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 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
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 *                                                                  *
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 ********************************************************************
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 function: libvorbis codec headers
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 ********************************************************************/
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#ifndef _vorbis_codec_h_
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#define _vorbis_codec_h_
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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#include "ogg.h"
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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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/* vorbis_dsp_state buffers the current vorbis audio
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   analysis/synthesis state.  The DSP state belongs to a specific
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   logical bitstream ****************************************************/
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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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  ogg_int32_t **pcm;
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  ogg_int32_t **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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  void       *backend_state;
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} vorbis_dsp_state;
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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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  ogg_int32_t  **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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} vorbis_block;
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/* vorbis_block is a single block of data to be processed as part of
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the analysis/synthesis stream; it belongs to a specific logical
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bitstream, but is independant from other vorbis_blocks belonging to
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that logical bitstream. *************************************************/
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struct alloc_chain{
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  void *ptr;
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  struct alloc_chain *next;
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};
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/* vorbis_info contains all the setup information specific to the
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   specific compression/decompression mode in progress (eg,
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   psychoacoustic settings, channel setup, options, codebook
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   etc). vorbis_info and substructures are in backends.h.
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*********************************************************************/
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/* the comments are not part of vorbis_info so that vorbis_info can be
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   static storage */
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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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/* libvorbis encodes in two abstraction layers; first we perform DSP
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   and produce a packet (see docs/analysis.txt).  The packet is then
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   coded into a framed OggSquish bitstream by the second layer (see
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   docs/framing.txt).  Decode is the reverse process; we sync/frame
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   the bitstream and extract individual packets, then decode the
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   packet back into PCM audio.
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   The extra framing/packetizing is used in streaming formats, such as
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   files.  Over the net (such as with UDP), the framing and
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   packetization aren't necessary as they're provided by the transport
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   and the streaming layer is not used */
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/* Vorbis PRIMITIVES: general ***************************************/
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extern void     vorbis_info_init(vorbis_info *vi);
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extern void     vorbis_info_clear(vorbis_info *vi);
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extern int      vorbis_info_blocksize(vorbis_info *vi,int zo);
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extern void     vorbis_comment_init(vorbis_comment *vc);
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extern void     vorbis_comment_add(vorbis_comment *vc, char *comment); 
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extern void     vorbis_comment_add_tag(vorbis_comment *vc, 
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				       char *tag, char *contents);
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extern char    *vorbis_comment_query(vorbis_comment *vc, char *tag, int count);
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extern int      vorbis_comment_query_count(vorbis_comment *vc, char *tag);
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extern void     vorbis_comment_clear(vorbis_comment *vc);
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extern int      vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb);
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extern int      vorbis_block_clear(vorbis_block *vb);
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extern void     vorbis_dsp_clear(vorbis_dsp_state *v);
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/* Vorbis PRIMITIVES: synthesis layer *******************************/
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extern int      vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,
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					  ogg_packet *op);
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extern int      vorbis_synthesis_init(vorbis_dsp_state *v,vorbis_info *vi);
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extern int      vorbis_synthesis_restart(vorbis_dsp_state *v);
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extern int      vorbis_synthesis(vorbis_block *vb,ogg_packet *op,int decodep);
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extern int      vorbis_synthesis_blockin(vorbis_dsp_state *v,vorbis_block *vb);
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extern int      vorbis_synthesis_pcmout(vorbis_dsp_state *v,ogg_int32_t ***pcm);
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extern int      vorbis_synthesis_read(vorbis_dsp_state *v,int samples);
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extern long     vorbis_packet_blocksize(vorbis_info *vi,ogg_packet *op);
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/* Vorbis ERRORS and return codes ***********************************/
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#define OV_FALSE      -1  
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#define OV_EOF        -2
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#define OV_HOLE       -3
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#define OV_EREAD      -128
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#define OV_EFAULT     -129
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#define OV_EIMPL      -130
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#define OV_EINVAL     -131
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#define OV_ENOTVORBIS -132
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#define OV_EBADHEADER -133
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#define OV_EVERSION   -134
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#define OV_ENOTAUDIO  -135
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#define OV_EBADPACKET -136
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#define OV_EBADLINK   -137
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#define OV_ENOSEEK    -138
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif
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