some cleanup

svn-id: r9575

1 files changed, 38 insertions, 55 deletions

diff --git a/sound/resample.h b/sound/resample.h
index f66ad75a5d..c64787906d 100644
--- a/sound/resample.h
+++ b/sound/resample.h
@@ -1,61 +1,44 @@
-/*
- * FILE: resample.h
- *   BY: Julius Smith (at CCRMA, Stanford U)
- * C BY: translated from SAIL to C by Christopher Lee Fraley
- *          (cf0v@andrew.cmu.edu)
- * DATE: 7-JUN-88
- * VERS: 2.0  (17-JUN-88, 3:00pm)
- */
-
-/*
- * October 29, 1999
- * Various changes, bugfixes(?), increased precision, by Stan Brooks.
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001-2003 The ScummVM project
  *
- * This source code is distributed in the hope that it will be useful,
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- */
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
 
-/* Conversion constants */
-#define Lc        7
-#define Nc       (1<<Lc)
-#define La        16
-#define Na       (1<<La)
-#define Lp       (Lc+La)
-#define Np       (1<<Lp)
-#define Amask    (Na-1)
-#define Pmask    (Np-1)
-
-#define MAXNWING  (80<<Lc)
-/* Description of constants:
- *
- * Nc - is the number of look-up values available for the lowpass filter
- *    between the beginning of its impulse response and the "cutoff time"
- *    of the filter.  The cutoff time is defined as the reciprocal of the
- *    lowpass-filter cut off frequence in Hz.  For example, if the
- *    lowpass filter were a sinc function, Nc would be the index of the
- *    impulse-response lookup-table corresponding to the first zero-
- *    crossing of the sinc function.  (The inverse first zero-crossing
- *    time of a sinc function equals its nominal cutoff frequency in Hz.)
- *    Nc must be a power of 2 due to the details of the current
- *    implementation. The default value of 128 is sufficiently high that
- *    using linear interpolation to fill in between the table entries
- *    gives approximately 16-bit precision, and quadratic interpolation
- *    gives about 23-bit (float) precision in filter coefficients.
- *
- * Lc - is log base 2 of Nc.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  *
- * La - is the number of bits devoted to linear interpolation of the
- *    filter coefficients.
- *
- * Lp - is La + Lc, the number of bits to the right of the binary point
- *    in the integer "time" variable. To the left of the point, it indexes
- *    the input array (X), and to the right, it is interpreted as a number
- *    between 0 and 1 sample of the input X.  The default value of 23 is
- *    about right.  There is a constraint that the filter window must be
- *    "addressable" in a int32_t, more precisely, if Nmult is the number
- *    of sinc zero-crossings in the right wing of the filter window, then
- *    (Nwing<<Lp) must be expressible in 31 bits.
+ * $Header$
  *
  */
+
+#ifndef SOUND_RESAMPLE_H
+#define SOUND_RESAMPLE_H
+
+#include "sound/rate.h"
+
+typedef struct {
+	byte priv[1024];
+} eff_struct;
+typedef eff_struct *eff_t;
+
+/** High quality rate conversion algorithm, based on SoX (http://sox.sourceforge.net). */
+class ResampleRateConverter : public RateConverter {
+protected:
+	eff_struct effp;
+public:
+	ResampleRateConverter(st_rate_t inrate, st_rate_t outrate, int quality);
+	~ResampleRateConverter();
+	virtual int flow(AudioInputStream &input, st_sample_t *obuf, st_size_t osamp, st_volume_t vol);
+	virtual int drain(st_sample_t *obuf, st_size_t osamp, st_volume_t vol);
+};
+
+
+#endif