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+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
+ * *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2015 *
+ * by the Xiph.Org Foundation https://xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: basic shared codebook operations
+
+ ********************************************************************/
+
+#ifndef _V_CODEBOOK_H_
+#define _V_CODEBOOK_H_
+
+#include <ogg/ogg.h>
+
+/* This structure encapsulates huffman and VQ style encoding books; it
+ doesn't do anything specific to either.
+
+ valuelist/quantlist are nonNULL (and q_* significant) only if
+ there's entry->value mapping to be done.
+
+ If encode-side mapping must be done (and thus the entry needs to be
+ hunted), the auxiliary encode pointer will point to a decision
+ tree. This is true of both VQ and huffman, but is mostly useful
+ with VQ.
+
+*/
+
+typedef struct static_codebook{
+ long dim; /* codebook dimensions (elements per vector) */
+ long entries; /* codebook entries */
+ char *lengthlist; /* codeword lengths in bits */
+
+ /* mapping ***************************************************************/
+ int maptype; /* 0=none
+ 1=implicitly populated values from map column
+ 2=listed arbitrary values */
+
+ /* The below does a linear, single monotonic sequence mapping. */
+ long q_min; /* packed 32 bit float; quant value 0 maps to minval */
+ long q_delta; /* packed 32 bit float; val 1 - val 0 == delta */
+ int q_quant; /* bits: 0 < quant <= 16 */
+ int q_sequencep; /* bitflag */
+
+ long *quantlist; /* map == 1: (int)(entries^(1/dim)) element column map
+ map == 2: list of dim*entries quantized entry vals
+ */
+ int allocedp;
+} static_codebook;
+
+typedef struct codebook{
+ long dim; /* codebook dimensions (elements per vector) */
+ long entries; /* codebook entries */
+ long used_entries; /* populated codebook entries */
+ const static_codebook *c;
+
+ /* for encode, the below are entry-ordered, fully populated */
+ /* for decode, the below are ordered by bitreversed codeword and only
+ used entries are populated */
+ float *valuelist; /* list of dim*entries actual entry values */
+ ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */
+
+ int *dec_index; /* only used if sparseness collapsed */
+ char *dec_codelengths;
+ ogg_uint32_t *dec_firsttable;
+ int dec_firsttablen;
+ int dec_maxlength;
+
+ /* The current encoder uses only centered, integer-only lattice books. */
+ int quantvals;
+ int minval;
+ int delta;
+} codebook;
+
+extern void vorbis_staticbook_destroy(static_codebook *b);
+extern int vorbis_book_init_encode(codebook *dest,const static_codebook *source);
+extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
+extern void vorbis_book_clear(codebook *b);
+
+extern float *_book_unquantize(const static_codebook *b,int n,int *map);
+extern float *_book_logdist(const static_codebook *b,float *vals);
+extern float _float32_unpack(long val);
+extern long _float32_pack(float val);
+extern int _best(codebook *book, float *a, int step);
+extern long _book_maptype1_quantvals(const static_codebook *b);
+
+extern int vorbis_book_besterror(codebook *book,float *a,int step,int addmul);
+extern long vorbis_book_codeword(codebook *book,int entry);
+extern long vorbis_book_codelen(codebook *book,int entry);
+
+
+
+extern int vorbis_staticbook_pack(const static_codebook *c,oggpack_buffer *b);
+extern static_codebook *vorbis_staticbook_unpack(oggpack_buffer *b);
+
+extern int vorbis_book_encode(codebook *book, int a, oggpack_buffer *b);
+
+extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
+extern long vorbis_book_decodevs_add(codebook *book, float *a,
+ oggpack_buffer *b,int n);
+extern long vorbis_book_decodev_set(codebook *book, float *a,
+ oggpack_buffer *b,int n);
+extern long vorbis_book_decodev_add(codebook *book, float *a,
+ oggpack_buffer *b,int n);
+extern long vorbis_book_decodevv_add(codebook *book, float **a,
+ long off,int ch,
+ oggpack_buffer *b,int n);
+
+
+
+#endif