/********************************************************************
* *
- * 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 1994-2000 *
- * by Monty <monty@xiph.org> 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: mdct.h,v 1.10 2000/01/22 13:28:26 xiphmont Exp $
********************************************************************/
#include "vorbis/codec.h"
-extern void mdct_init(mdct_lookup *lookup,int n);
-extern void mdct_clear(mdct_lookup *l);
-extern void mdct_forward(mdct_lookup *init, double *in, double *out);
-extern void mdct_backward(mdct_lookup *init, double *in, double *out);
-#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