From 01beb9919b95479d8be040bec74abc5cc67a5e43 Mon Sep 17 00:00:00 2001
From: Mikko Tiusanen <ams@daug.net>
Date: Sun, 4 May 2014 01:18:52 +0300
Subject: Initial import.

---
 src/libspeex/vorbis_psy.h | 97 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/libspeex/vorbis_psy.h

(limited to 'src/libspeex/vorbis_psy.h')

diff --git a/src/libspeex/vorbis_psy.h b/src/libspeex/vorbis_psy.h
new file mode 100644
index 0000000..6871057
--- /dev/null
+++ b/src/libspeex/vorbis_psy.h
@@ -0,0 +1,97 @@
+/* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery
+   File: vorbis_psy.h
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef VORBIS_PSY_H
+#define VORBIS_PSY_H
+
+#ifdef VORBIS_PSYCHO
+
+#include "smallft.h"
+#define P_BANDS 17      /* 62Hz to 16kHz */
+#define NOISE_COMPAND_LEVELS 40
+
+
+#define todB(x)   ((x)>1e-13?log((x)*(x))*4.34294480f:-30)
+#define fromdB(x) (exp((x)*.11512925f))  
+
+/* The bark scale equations are approximations, since the original
+   table was somewhat hand rolled.  The below are chosen to have the
+   best possible fit to the rolled tables, thus their somewhat odd
+   appearance (these are more accurate and over a longer range than
+   the oft-quoted bark equations found in the texts I have).  The
+   approximations are valid from 0 - 30kHz (nyquist) or so.
+
+   all f in Hz, z in Bark */
+
+#define toBARK(n)   (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n))
+#define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f)
+
+/* Frequency to octave.  We arbitrarily declare 63.5 Hz to be octave
+   0.0 */
+
+#define toOC(n)     (log(n)*1.442695f-5.965784f)
+#define fromOC(o)   (exp(((o)+5.965784f)*.693147f))
+
+
+typedef struct {
+
+  float noisewindowlo;
+  float noisewindowhi;
+  int   noisewindowlomin;
+  int   noisewindowhimin;
+  int   noisewindowfixed;
+  float noiseoff[P_BANDS];
+  float noisecompand[NOISE_COMPAND_LEVELS];
+
+} VorbisPsyInfo;
+
+
+
+typedef struct {
+  int n;
+  int rate;
+  struct drft_lookup lookup;
+  VorbisPsyInfo *vi;
+
+  float *window;
+  float *noiseoffset;
+  long  *bark;
+
+} VorbisPsy;
+
+
+VorbisPsy *vorbis_psy_init(int rate, int size);
+void vorbis_psy_destroy(VorbisPsy *psy);
+void compute_curve(VorbisPsy *psy, float *audio, float *curve);
+void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord);
+
+#endif
+#endif
-- 
cgit