Merge commit '74f4b1bc3b627ba4c7e03498234d88cacdfbe97b' as 'vorbis'

1 files changed, 117 insertions, 0 deletions

diff --git a/vorbis/lib/codebook.h b/vorbis/lib/codebook.h
new file mode 100644
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+++ b/vorbis/lib/codebook.h
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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 http://www.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