Add cmake as optional build system to Travis-CI configuration

[platform/upstream/libvorbis.git] / lib / mdct.h

diff --git a/lib/mdct.h b/lib/mdct.h
index f7d3dbd..289a8e7 100644 (file)
--- a/lib/mdct.h
+++ b/lib/mdct.h
@@ -1,47 +1,71 @@
 /********************************************************************
  *                                                                  *
- * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE.  *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
- * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE.    *
- * PLEASE READ THESE TERMS DISTRIBUTING.                            *
+ * 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 OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-1999             *
- * by 1999 Monty and The XIPHOPHORUS Company                        *
- * http://www.xiph.org/                                             *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
  *                                                                  *
  ********************************************************************
 
  function: modified discrete cosine transform prototypes
+ last mod: $Id$
 
  ********************************************************************/
 
-#ifndef _OGG_MDCT_H_
-#define _OGG_MDCT_H_
+#ifndef _OGG_mdct_H_
+#define _OGG_mdct_H_
 
-typedef struct {
-  int n;
-  int log2n;
-  
-  double *trig;
-  int    *bitrev;
+#include "vorbis/codec.h"
 
-} MDCT_lookup;
 
-extern MDCT_lookup *MDCT_init(int n);
-extern void MDCT_free(MDCT_lookup *l);
-extern void MDCT(double *in, double *out, MDCT_lookup *init, double *window);
-extern void iMDCT(double *in, double *out, MDCT_lookup *init, double *window);
 
-#endif
 
 
+/*#define MDCT_INTEGERIZED  <- be warned there could be some hurt left here*/
+#ifdef MDCT_INTEGERIZED
 
+#define DATA_TYPE int
+#define REG_TYPE  register int
+#define TRIGBITS 14
+#define cPI3_8 6270
+#define cPI2_8 11585
+#define cPI1_8 15137
 
+#define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
+#define MULT_NORM(x) ((x)>>TRIGBITS)
+#define HALVE(x) ((x)>>1)
 
+#else
 
+#define DATA_TYPE float
+#define REG_TYPE  float
+#define cPI3_8 .38268343236508977175F
+#define cPI2_8 .70710678118654752441F
+#define cPI1_8 .92387953251128675613F
 
+#define FLOAT_CONV(x) (x)
+#define MULT_NORM(x) (x)
+#define HALVE(x) ((x)*.5f)
 
+#endif
 
 
+typedef struct {
+  int n;
+  int log2n;
+
+  DATA_TYPE *trig;
+  int       *bitrev;
 
+  DATA_TYPE scale;
+} mdct_lookup;
 
+extern void mdct_init(mdct_lookup *lookup,int n);
+extern void mdct_clear(mdct_lookup *l);
+extern void mdct_forward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
+extern void mdct_backward(mdct_lookup *init, DATA_TYPE *in, DATA_TYPE *out);
+
+#endif