apps/codecs/libmusepack

/********************************************************************
 *                                                                  *
 * 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: floor backend 0 implementation

 ********************************************************************/

#include "config-tremor.h"
#include <string.h>
#include <math.h>
#include "ogg.h"
#include "ivorbiscodec.h"
#include "codec_internal.h"
#include "registry.h"
#include "codebook.h"
#include "misc.h"
#include "os.h"

#define LSP_FRACBITS 14

typedef struct {
  long n;
  int ln;
  int  m;
  int *linearmap;

  vorbis_info_floor0 *vi;
  ogg_int32_t *lsp_look;

} vorbis_look_floor0;

/*************** LSP decode ********************/

#include "lsp_lookup.h"

/* interpolated 1./sqrt(p) where .5 <= a < 1. (.100000... to .111111...) in
   16.16 format 
   returns in m.8 format */

static const long ADJUST_SQRT2[2] ICONST_ATTR ={8192,5792};
static inline ogg_int32_t vorbis_invsqlook_i(long a,long e){
  long i=(a&0x7fff)>>(INVSQ_LOOKUP_I_SHIFT-1); 
  long d=a&INVSQ_LOOKUP_I_MASK;                              /*  0.10 */
  long val=INVSQ_LOOKUP_I[i]-                                /*  1.16 */
    ((INVSQ_LOOKUP_IDel[i]*d)>>INVSQ_LOOKUP_I_SHIFT);        /* result 1.16 */
  val*=ADJUST_SQRT2[e&1];
  e=(e>>1)+21;
  return(val>>e);
}

/* interpolated lookup based fromdB function, domain -140dB to 0dB only */
/* a is in n.12 format */
static inline ogg_int32_t vorbis_fromdBlook_i(long a){
  int i=(-a)>>(12-FROMdB2_SHIFT);
  if(i<0) return 0x7fffffff;
  if(i>=(FROMdB_LOOKUP_SZ<<FROMdB_SHIFT))return 0;
  
  return FROMdB_LOOKUP[i>>FROMdB_SHIFT] * FROMdB2_LOOKUP[i&FROMdB2_MASK];
}

/* interpolated lookup based cos function, domain 0 to PI only */
/* a is in 0.16 format, where 0==0, 2^^16-1==PI, return 0.14 */
static inline ogg_int32_t vorbis_coslook_i(long a){
  int i=a>>COS_LOOKUP_I_SHIFT;
  int d=a&COS_LOOKUP_I_MASK;
  return COS_LOOKUP_I[i]- ((d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
			   COS_LOOKUP_I_SHIFT);
}

/* interpolated lookup based cos function */
/* a is in 0.16 format, where 0==0, 2^^16==PI, return .LSP_FRACBITS */
static inline ogg_int32_t vorbis_coslook2_i(long a){
  a=a&0x1ffff;

  if(a>0x10000)a=0x20000-a;
  {               
    int i=a>>COS_LOOKUP_I_SHIFT;
    int d=a&COS_LOOKUP_I_MASK;
    a=((COS_LOOKUP_I[i]<<COS_LOOKUP_I_SHIFT)-
       d*(COS_LOOKUP_I[i]-COS_LOOKUP_I[i+1]))>>
      (COS_LOOKUP_I_SHIFT-LSP_FRACBITS+14);
  }
  
  return(a);
}

static const int barklook[28] IDATA_ATTR ={
  0,100,200,301,          405,516,635,766,
  912,1077,1263,1476,     1720,2003,2333,2721,
  3184,3742,4428,5285,    6376,7791,9662,12181,
  15624,20397,27087,36554
};
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-rw-r--r--	COPYING	1563	log plain
-rw-r--r--	ChangeLog	295	log plain
-rw-r--r--	Makefile	1402	log plain
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-rw-r--r--	README.rockbox	925	log plain
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-rw-r--r--	config-mpc.h	2951	log plain
-rw-r--r--	config_types.h	2008	log plain
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-rw-r--r--	huffman.h	1995	log plain
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-rwxr-xr-x	mpc_config.h	1741	log plain
-rw-r--r--	mpc_decoder.c	63412	log plain
-rw-r--r--	musepack.h	5693	log plain
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