--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libtremor/tremor/codebook.h Sun Oct 09 20:41:17 2011 +0200
@@ -0,0 +1,102 @@
+/********************************************************************
+ * *
+ * THIS FILE IS PART OF THE OggVorbis 'TREMOR' 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 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
+ * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: basic shared codebook operations
+
+ ********************************************************************/
+
+#ifndef _V_CODEBOOK_H_
+#define _V_CODEBOOK_H_
+
+#include "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 */
+ long *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
+ */
+} static_codebook;
+
+typedef struct codebook{
+ long dim; /* codebook dimensions (elements per vector) */
+ long entries; /* codebook entries */
+ long used_entries; /* populated codebook entries */
+
+ /* the below are ordered by bitreversed codeword and only used
+ entries are populated */
+ int binarypoint;
+ ogg_int32_t *valuelist; /* list of dim*entries actual entry values */
+ ogg_uint32_t *codelist; /* list of bitstream codewords for each entry */
+
+ int *dec_index;
+ char *dec_codelengths;
+ ogg_uint32_t *dec_firsttable;
+ int dec_firsttablen;
+ int dec_maxlength;
+
+ 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 */
+
+} codebook;
+
+extern void vorbis_staticbook_clear(static_codebook *b);
+extern void vorbis_staticbook_destroy(static_codebook *b);
+extern int vorbis_book_init_decode(codebook *dest,const static_codebook *source);
+
+extern void vorbis_book_clear(codebook *b);
+extern long _book_maptype1_quantvals(const static_codebook *b);
+
+extern int vorbis_staticbook_unpack(oggpack_buffer *b,static_codebook *c);
+
+extern long vorbis_book_decode(codebook *book, oggpack_buffer *b);
+extern long vorbis_book_decodevs_add(codebook *book, ogg_int32_t *a,
+ oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodev_set(codebook *book, ogg_int32_t *a,
+ oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodev_add(codebook *book, ogg_int32_t *a,
+ oggpack_buffer *b,int n,int point);
+extern long vorbis_book_decodevv_add(codebook *book, ogg_int32_t **a,
+ long off,int ch,
+ oggpack_buffer *b,int n,int point);
+
+extern int _ilog(unsigned int v);
+
+
+#endif