summaryrefslogtreecommitdiffstats
path: root/media/libvorbis/lib/scales.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
commit43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree620249daf56c0258faa40cbdcf9cfba06de2a846 /media/libvorbis/lib/scales.h
parentInitial commit. (diff)
downloadfirefox-upstream.tar.xz
firefox-upstream.zip
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'media/libvorbis/lib/scales.h')
-rw-r--r--media/libvorbis/lib/scales.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/media/libvorbis/lib/scales.h b/media/libvorbis/lib/scales.h
new file mode 100644
index 0000000000..3c2ae48d9e
--- /dev/null
+++ b/media/libvorbis/lib/scales.h
@@ -0,0 +1,89 @@
+/********************************************************************
+ * *
+ * 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 https://xiph.org/ *
+ * *
+ ********************************************************************
+
+ function: linear scale -> dB, Bark and Mel scales
+
+ ********************************************************************/
+
+#ifndef _V_SCALES_H_
+#define _V_SCALES_H_
+
+#include <math.h>
+#include "os.h"
+
+#ifdef _MSC_VER
+/* MS Visual Studio doesn't have C99 inline keyword. */
+#define inline __inline
+#endif
+
+/* 20log10(x) */
+#define VORBIS_IEEE_FLOAT32 1
+#ifdef VORBIS_IEEE_FLOAT32
+
+static inline float unitnorm(float x){
+ union {
+ ogg_uint32_t i;
+ float f;
+ } ix;
+ ix.f = x;
+ ix.i = (ix.i & 0x80000000U) | (0x3f800000U);
+ return ix.f;
+}
+
+/* Segher was off (too high) by ~ .3 decibel. Center the conversion correctly. */
+static inline float todB(const float *x){
+ union {
+ ogg_uint32_t i;
+ float f;
+ } ix;
+ ix.f = *x;
+ ix.i = ix.i&0x7fffffff;
+ return (float)(ix.i * 7.17711438e-7f -764.6161886f);
+}
+
+#define todB_nn(x) todB(x)
+
+#else
+
+static float unitnorm(float x){
+ if(x<0)return(-1.f);
+ return(1.f);
+}
+
+#define todB(x) (*(x)==0?-400.f:log(*(x)**(x))*4.34294480f)
+#define todB_nn(x) (*(x)==0.f?-400.f:log(*(x))*8.6858896f)
+
+#endif
+
+#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)
+#define toMEL(n) (log(1.f+(n)*.001f)*1442.695f)
+#define fromMEL(m) (1000.f*exp((m)/1442.695f)-1000.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))
+
+#endif