* 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 1994-2001 *
- * by the XIPHOPHORUS Company http://www.xiph.org/ *
-
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
+ * by the Xiph.Org Foundation https://xiph.org/ *
+ * *
********************************************************************
function: PCM data envelope analysis and manipulation
- last mod: $Id: envelope.h,v 1.17 2001/12/12 09:45:25 xiphmont Exp $
********************************************************************/
#ifndef _V_ENVELOPE_
#define _V_ENVELOPE_
-#include "iir.h"
-#include "smallft.h"
+#include "mdct.h"
+
+#define VE_PRE 16
+#define VE_WIN 4
+#define VE_POST 2
+#define VE_AMP (VE_PRE+VE_POST-1)
+
+#define VE_BANDS 7
+#define VE_NEARDC 15
+
+#define VE_MINSTRETCH 2 /* a bit less than short block */
+#define VE_MAXSTRETCH 12 /* one-third full block */
+
+typedef struct {
+ float ampbuf[VE_AMP];
+ int ampptr;
+
+ float nearDC[VE_NEARDC];
+ float nearDC_acc;
+ float nearDC_partialacc;
+ int nearptr;
+
+} envelope_filter_state;
+
+typedef struct {
+ int begin;
+ int end;
+ float *window;
+ float total;
+} envelope_band;
typedef struct {
int ch;
int searchstep;
float minenergy;
- IIR_state *iir;
- float **filtered;
+ mdct_lookup mdct;
+ float *mdct_win;
+
+ envelope_band band[VE_BANDS];
+ envelope_filter_state *filter;
+ int stretch;
+
+ int *mark;
long storage;
long current;
- long mark;
- long prevmark;
+ long curmark;
long cursor;
} envelope_lookup;
#endif
-