Merge commit '74f4b1bc3b627ba4c7e03498234d88cacdfbe97b' as 'vorbis'

1 files changed, 70 insertions, 0 deletions

diff --git a/vorbis/lib/mdct.h b/vorbis/lib/mdct.h
new file mode 100644
index 0000000..3b8c9ba
--- /dev/null
+++ b/vorbis/lib/mdct.h
@@ -0,0 +1,70 @@
+/********************************************************************
+ *                                                                  *
+ * 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 1994-2009             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+ function: modified discrete cosine transform prototypes
+
+ ********************************************************************/
+
+#ifndef _OGG_mdct_H_
+#define _OGG_mdct_H_
+
+#include "vorbis/codec.h"
+
+
+
+
+
+/*#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