Initial community commit

9 files changed, 1199 insertions, 0 deletions

diff --git a/Src/ReplayGainAnalysis/ReplayGainAnalysis.rc b/Src/ReplayGainAnalysis/ReplayGainAnalysis.rc
new file mode 100644
index 00000000..1c4615df
--- /dev/null
+++ b/Src/ReplayGainAnalysis/ReplayGainAnalysis.rc
@@ -0,0 +1,63 @@
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+//
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "afxres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (U.K.) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENG)
+#ifdef _WIN32
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_UK
+#pragma code_page(1252)
+#endif //_WIN32
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE 
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE 
+BEGIN
+    "#include ""afxres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE 
+BEGIN
+    "#include ""version.rc2""\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+#endif    // English (U.K.) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+#include "version.rc2"
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED
+
diff --git a/Src/ReplayGainAnalysis/ReplayGainAnalysis.sln b/Src/ReplayGainAnalysis/ReplayGainAnalysis.sln
new file mode 100644
index 00000000..c5f826f3
--- /dev/null
+++ b/Src/ReplayGainAnalysis/ReplayGainAnalysis.sln
@@ -0,0 +1,44 @@
+
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+MinimumVisualStudioVersion = 10.0.40219.1
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+	ProjectSection(ProjectDependencies) = postProject
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F} = {DABE6307-F8DD-416D-9DAC-673E2DECB73F}
+	EndProjectSection
+EndProject
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+EndProject
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+		Debug|x64 = Debug|x64
+		Release|Win32 = Release|Win32
+		Release|x64 = Release|x64
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+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}.Debug|Win32.Build.0 = Debug|Win32
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+		{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}.Release|Win32.Build.0 = Release|Win32
+		{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}.Release|x64.ActiveCfg = Release|x64
+		{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}.Release|x64.Build.0 = Release|x64
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Debug|Win32.ActiveCfg = Debug|Win32
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Debug|Win32.Build.0 = Debug|Win32
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Debug|x64.ActiveCfg = Debug|x64
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Debug|x64.Build.0 = Debug|x64
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Release|Win32.ActiveCfg = Release|Win32
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Release|Win32.Build.0 = Release|Win32
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Release|x64.ActiveCfg = Release|x64
+		{DABE6307-F8DD-416D-9DAC-673E2DECB73F}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {52EA9FC4-8D53-4004-86F4-7EE5E887F47B}
+	EndGlobalSection
+EndGlobal
diff --git a/Src/ReplayGainAnalysis/ReplayGainAnalysis.vcxproj b/Src/ReplayGainAnalysis/ReplayGainAnalysis.vcxproj
new file mode 100644
index 00000000..bcdea7ed
--- /dev/null
+++ b/Src/ReplayGainAnalysis/ReplayGainAnalysis.vcxproj
@@ -0,0 +1,260 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
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+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{8155E1C4-B6F8-4A1D-96A3-E4FF0FE9192D}</ProjectGuid>
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+    <VcpkgInstalledDir>..\external_dependencies\vcpkg</VcpkgInstalledDir>
+    <VcpkgUseStatic>true</VcpkgUseStatic>
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+  <PropertyGroup Label="Vcpkg" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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new file mode 100644
index 00000000..c4c0be3d
--- /dev/null
+++ b/Src/ReplayGainAnalysis/ReplayGainAnalysis.vcxproj.filters
@@ -0,0 +1,32 @@
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new file mode 100644
index 00000000..e8d67496
--- /dev/null
+++ b/Src/ReplayGainAnalysis/ReplayGainAnalysis.xcodeproj/project.pbxproj
@@ -0,0 +1,191 @@
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diff --git a/Src/ReplayGainAnalysis/gain_analysis.c b/Src/ReplayGainAnalysis/gain_analysis.c
new file mode 100644
index 00000000..ade89a80
--- /dev/null
+++ b/Src/ReplayGainAnalysis/gain_analysis.c
@@ -0,0 +1,496 @@
+/*
+*  ReplayGainAnalysis - analyzes input samples and give the recommended dB change
+*  Copyright (C) 2001 David Robinson and Glen Sawyer
+*  Improvements and optimizations added by Frank Klemm, and by Marcel Müller 
+*
+*  This library is free software; you can redistribute it and/or
+*  modify it under the terms of the GNU Lesser General Public
+*  License as published by the Free Software Foundation; either
+*  version 2.1 of the License, or (at your option) any later version.
+*
+*  This library 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.  See the GNU
+*  Lesser General Public License for more details.
+*
+*  You should have received a copy of the GNU Lesser General Public
+*  License along with this library; if not, write to the Free Software
+*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*
+*  concept and filter values by David Robinson (David@Robinson.org)
+*    -- blame him if you think the idea is flawed
+*  original coding by Glen Sawyer (mp3gain@hotmail.com)
+*    -- blame him if you think this runs too slowly, or the coding is otherwise flawed
+*
+*  lots of code improvements by Frank Klemm ( http://www.uni-jena.de/~pfk/mpp/ )
+*    -- credit him for all the _good_ programming ;)
+*
+*
+*  For an explanation of the concepts and the basic algorithms involved, go to:
+*    http://www.replaygain.org/
+*/
+
+/*
+ *  Here's the deal. Call
+ *
+ *    InitGainAnalysis ( long samplefreq );
+ *
+ *  to initialize everything. Call
+ *
+ *    AnalyzeSamples ( const Float_t*  left_samples,
+ *                     const Float_t*  right_samples,
+ *                     size_t          num_samples,
+ *                     int             num_channels );
+ *
+ *  as many times as you want, with as many or as few samples as you want.
+ *  If mono, pass the sample buffer in through left_samples, leave
+ *  right_samples NULL, and make sure num_channels = 1.
+ *
+ *    GetTitleGain()
+ *
+ *  will return the recommended dB level change for all samples analyzed
+ *  SINCE THE LAST TIME you called GetTitleGain() OR InitGainAnalysis().
+ *
+ *    GetAlbumGain()
+ *
+ *  will return the recommended dB level change for all samples analyzed
+ *  since InitGainAnalysis() was called and finalized with GetTitleGain().
+ *
+ *  Pseudo-code to process an album:
+ *
+ *    Float_t       l_samples [4096];
+ *    Float_t       r_samples [4096];
+ *    size_t        num_samples;
+ *    unsigned int  num_songs;
+ *    unsigned int  i;
+ *
+ *    InitGainAnalysis ( 44100 );
+ *    for ( i = 1; i <= num_songs; i++ ) {
+ *        while ( ( num_samples = getSongSamples ( song[i], left_samples, right_samples ) ) > 0 )
+ *            AnalyzeSamples ( left_samples, right_samples, num_samples, 2 );
+ *        fprintf ("Recommended dB change for song %2d: %+6.2f dB\n", i, GetTitleGain() );
+ *    }
+ *    fprintf ("Recommended dB change for whole album: %+6.2f dB\n", GetAlbumGain() );
+ */
+
+/*
+ *  So here's the main source of potential code confusion:
+ *
+ *  The filters applied to the incoming samples are IIR filters,
+ *  meaning they rely on up to <filter order> number of previous samples
+ *  AND up to <filter order> number of previous filtered samples.
+ *
+ *  I set up the AnalyzeSamples routine to minimize memory usage and interface
+ *  complexity. The speed isn't compromised too much (I don't think), but the
+ *  internal complexity is higher than it should be for such a relatively
+ *  simple routine.
+ *
+ *  Optimization/clarity suggestions are welcome.
+ */
+
+/*
+ *  30 Aug 2006 - Ben Allison (benski[]nullsoft.com)
+ *   Modification to allow for multiple instances to be run simtulaneously (via context pointer)
+ *  03 July 2007 - Marc Lerch (marc.lerch[]gmail.com) and Ben Allison (benski[]nullsoft.com)
+ *   Coefficients for 64000, 88200 and 96000 sampling rates
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "gain_analysis.h"
+#include "../nsutil/iir.h"
+#include "../nsutil/stats.h"
+
+typedef unsigned short Uint16_t;
+typedef signed short Int16_t;
+typedef unsigned int Uint32_t;
+typedef signed int Int32_t;
+
+#define YULE_ORDER         10
+#define BUTTER_ORDER        2
+#define RMS_PERCENTILE      0.95        // percentile which is louder than the proposed level
+#define MAX_SAMP_FREQ   192000.          // maximum allowed sample frequency [Hz]
+#define RMS_WINDOW_TIME     0.050       // Time slice size [s]
+#define STEPS_per_dB      100.          // Table entries per dB
+#define MAX_dB            120.          // Table entries for 0...MAX_dB (normal max. values are 70...80 dB)
+
+#define MAX_ORDER               (BUTTER_ORDER > YULE_ORDER ? BUTTER_ORDER : YULE_ORDER)
+#define MAX_SAMPLES_PER_WINDOW  (size_t) (MAX_SAMP_FREQ * RMS_WINDOW_TIME)      // max. Samples per Time slice
+#define PINK_REF                64.82 //298640883795                              // calibration value
+
+
+typedef struct
+{
+	Float_t linprebuf [MAX_ORDER * 2];
+	Float_t* linpre;                                          // left input samples, with pre-buffer
+	Float_t loutbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
+	Float_t* lout;                                            // left "out" (i.e. post second filter) samples
+	Float_t rinprebuf [MAX_ORDER * 2];
+	Float_t* rinpre;                                          // right input samples ...
+	Float_t routbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER];
+	Float_t* rout;
+	size_t sampleWindow;                                    // number of samples required to reach number of milliseconds required for RMS window
+	size_t totsamp;
+	double lsum;
+	double rsum;
+	int freqindex;
+	int first;
+
+	Uint32_t A [(size_t)(STEPS_per_dB * MAX_dB)];
+	Uint32_t B [(size_t)(STEPS_per_dB * MAX_dB)];
+	nsutil_iir_t butter_iir;
+	nsutil_iir_t yule_iir;
+} ReplayGainContext;
+
+
+#ifdef WIN32
+#ifndef __GNUC__
+#pragma warning ( disable : 4305 )
+#endif
+#endif
+
+typedef const float yule_coefficients[2*(YULE_ORDER + 1)]; 
+static yule_coefficients ABYule[] =
+{
+{ 0.038575994352, -0.02160367184185, -0.00123395316851, -9.291677959e-005, -0.01655260341619, 0.02161526843274, -0.02074045215285, 0.00594298065125, 0.00306428023191, 0.00012025322027, 0.00288463683916,
+  1, -3.8466461711807, 7.8150165300554, -11.34170355132, 13.055042193275, -12.287598951453, 9.4829380631979, -5.87257861776, 2.7546586187461, -0.86984376593551, 0.13919314567432 },
+{ 0.0541865640643, -0.02911007808948, -0.00848709379851, -0.00851165645469, -0.00834990904936, 0.02245293253339, -0.02596338512915, 0.01624864962975, -0.00240879051584, 0.00674613682247, -0.00187763777362,
+  1, -3.4784594855007, 6.3631777756615, -8.5475152747187, 9.4769360780128, -8.8149868137015, 6.85401540937, -4.3947099607956, 2.1961168489077, -0.75104302451432, 0.13149317958808 },
+{ 0.15457299681924, -0.09331049056315, -0.06247880153653, 0.02163541888798, -0.05588393329856, 0.04781476674921, 0.00222312597743, 0.03174092540049, -0.01390589421898, 0.00651420667831, -0.00881362733839,
+  1, -2.3789883497308, 2.8486815115633, -2.6457717022983, 2.2369765745171, -1.671481533676, 1.0059595480855, -0.45953458054983, 0.16378164858596, -0.05032077717131, 0.0234789740702 },
+{ 0.30296907319327, -0.22613988682123, -0.08587323730772, 0.03282930172664, -0.00915702933434, -0.02364141202522, -0.00584456039913, 0.06276101321749, -8.28086748e-006, 0.00205861885564, -0.02950134983287,
+  1, -1.6127316513725, 1.0797749225997, -0.2565625775407, -0.1627671912044, -0.22638893773906, 0.39120800788284, -0.22138138954925, 0.04500235387352, 0.02005851806501, 0.00302439095741 },
+{ 0.33642304856132, -0.2557224142557, -0.11828570177555, 0.11921148675203, -0.07834489609479, -0.0046997791438, -0.0058950022444, 0.05724228140351, 0.00832043980773, -0.0163538138454, -0.0176017656815,
+  1, -1.498589793678, 0.87350271418188, 0.12205022308084, -0.80774944671438, 0.47854794562326, -0.12453458140019, -0.04067510197014, 0.08333755284107, -0.04237348025746, 0.02977207319925 },
+{ 0.4491525660845, -0.14351757464547, -0.22784394429749, -0.01419140100551, 0.04078262797139, -0.12398163381748, 0.04097565135648, 0.10478503600251, -0.01863887810927, -0.03193428438915, 0.00541907748707,
+  1, -0.62820619233671, 0.29661783706366, -0.372563729424, 0.00213767857124, -0.42029820170918, 0.22199650564824, 0.00613424350682, 0.06747620744683, 0.05784820375801, 0.03222754072173 },
+{ 0.56619470757641, -0.75464456939302, 0.1624213774223, 0.16744243493672, -0.18901604199609, 0.3093178284183, -0.27562961986224, 0.00647310677246, 0.08647503780351, -0.0378898455484, -0.00588215443421,
+  1, -1.0480033512635, 0.29156311971249, -0.26806001042947, 0.00819999645858, 0.45054734505008, -0.33032403314006, 0.0673936833311, -0.04784254229033, 0.01639907836189, 0.01807364323573 },
+{ 0.58100494960553, -0.53174909058578, -0.14289799034253, 0.17520704835522, 0.02377945217615, 0.15558449135573, -0.25344790059353, 0.01628462406333, 0.06920467763959, -0.03721611395801, -0.00749618797172,
+  1, -0.51035327095184, -0.31863563325245, -0.20256413484477, 0.1472815413433, 0.38952639978999, -0.23313271880868, -0.05246019024463, -0.02505961724053, 0.02442357316099, 0.01818801111503 },
+{ 0.53648789255105, -0.42163034350696, -0.00275953611929, 0.04267842219415, -0.10214864179676, 0.14590772289388, -0.02459864859345, -0.11202315195388, -0.04060034127, 0.0478866554818, -0.02217936801134,
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+  1, -1.2970891840453, 0.90399339674203, -0.29613799017877, -0.42326645916207, 0.379348874022, -0.37919795944938, 0.23410283284785, -0.03892971758879, 0.00403009552351, 0.03640166626278 },
+{ 0.08717879977844, -0.01000374016172, -0.06265852122368, -0.0111932880095, -0.0011427937296, 0.02081333954769, -0.01603261863207, 0.01936763028546, 0.00760044736442, -0.00303979112271, -0.00075088605788,
+  1, -2.6281631147215, 3.5373453581799, -3.8100344867892, 3.9129163673013, -3.5351860589629, 2.7135686615787, -1.8672331184659, 1.1207538236766, -0.4857408688689, 0.11330544663849 },
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+  1, -4.8737731309003, 12.039221601402, -20.101511183814, 25.103885344152, -24.290655608159, 18.271584690907, -10.452495525606, 4.30319491872, -1.1371699207019, 0.14510733527035 },
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+  1, -5.7362547709212, 16.15249794355, -29.686549124645, 39.557061556741, -39.825245562463, 30.50605345013, -17.430517728212, 7.0515457390802, -1.8078383972051, 0.22127840210813 },
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+{ 0.01184742123123, -0.04631092400086, 0.06584226961238, -0.02165588522478, -0.05656260778952, 0.0860749359276, -0.03375544339786, -0.04216579932754, 0.06416711490648, -0.03444708260844, 0.00697275872241,
+  1, -5.2472731834817, 10.608215851922, -8.7412766581041, -1.3390607137168, 8.0797288209661, -5.4617991895085, 0.54318070652536, 0.8745096922428, -0.34656083539754, 0.03034796843589 }
+};
+
+typedef __declspec(align(32)) const float butter_coefficients[2*(BUTTER_ORDER + 1)];
+static butter_coefficients ABButter[] =
+{
+{ 0.98621192462708, -1.9724238492542, 0.98621192462708, 1, -1.9722337291953, 0.97261396931306 },
+{ 0.98500175787242, -1.9700035157448, 0.98500175787242, 1, -1.9697785558262, 0.9702284756635 },
+{ 0.97938932735214, -1.9587786547043, 0.97938932735214, 1, -1.958353809754, 0.95920349965459 },
+{ 0.97531843204928, -1.9506368640986, 0.97531843204928, 1, -1.9500275914988, 0.95124613669835 },
+{ 0.97316523498161, -1.9463304699632, 0.97316523498161, 1, -1.9456102356653, 0.94705070426118 },
+{ 0.96454515552826, -1.9290903110565, 0.96454515552826, 1, -1.9278328697704, 0.93034775234268 },
+{ 0.96009142950541, -1.9201828590108, 0.96009142950541, 1, -1.9185895303378, 0.92177618768381 },
+{ 0.95856916599601, -1.917138331992, 0.95856916599601, 1, -1.9154210807478, 0.91885558323625 },
+{ 0.94597685600279, -1.8919537120056, 0.94597685600279, 1, -1.8890330793945, 0.89487434461664 },
+{ 0.96535326815829, -1.9307065363166, 0.96535326815829, 1, -1.9295057798352, 0.93190729279793 },
+{ 0.98252400815195, -1.9650480163039, 0.98252400815195, 1, -1.9647425826904, 0.9653534499174 },
+{ 0.98816995007392, -1.9763399001478, 0.98816995007392, 1, -1.9761999451697, 0.97647985512594 },
+{ 0.98964101933472, -1.9792820386694, 0.98964101933472, 1, -1.9791747273101, 0.9793893500288 },
+{ 0.99247255046129, -1.9849451009226, 0.99247255046129, 1, -1.9848884376234, 0.98500176422183 },
+{ 0.99308203517541, -1.9861640703508, 0.99308203517541, 1, -1.9861162115409, 0.98621192916075 },
+{ 0.99406737810867, -1.9881347562173, 0.99406737810867, 1, -1.9880995599051, 0.98816995252954 },
+{ 0.99480702681278, -1.9896140536256, 0.99480702681278, 1, -1.9895870864732, 0.9896410207779 },
+{ 0.99538268958706, -1.9907653791741, 0.99538268958706, 1, -1.9907440595051, 0.99078669884321 },
+{ 0.99622916581118, -1.9924583316224, 0.99622916581118, 1, -1.9924441123813, 0.99247255086339 },
+{ 0.99653501465135, -1.9930700293027, 0.99653501465135, 1, -1.9930580231432, 0.99308203546221 },
+};
+
+
+#ifdef WIN32
+#ifndef __GNUC__
+#pragma warning ( default : 4305 )
+#endif
+#endif
+
+// When calling these filter procedures, make sure that ip[-order] and op[-order] point to real data!
+
+// If your compiler complains that "'operation on 'output' may be undefined", you can
+// either ignore the warnings or uncomment the three "y" lines (and comment out the indicated line)
+
+static void YULE_FILTER(nsutil_iir_t *iir, const Float_t* input, Float_t* output, size_t nSamples)
+{
+
+	nsutil_iir_Filter_F32(iir, input, output, (int)nSamples);
+}
+
+static void BUTTER_FILTER(nsutil_iir_t *iir, Float_t* samples, size_t nSamples)
+{
+	nsutil_iir_Filter_F32_IP(iir, samples, (int)nSamples);
+}
+
+// returns a INIT_GAIN_ANALYSIS_OK if successful, INIT_GAIN_ANALYSIS_ERROR if not
+
+DLLEXPORT int WAResetSampleFrequency(void *context,  long samplefreq )
+{
+	int i;
+	ReplayGainContext *rg=context;
+
+	// zero out initial values
+	for ( i = 0; i < MAX_ORDER; i++ )
+		rg->linprebuf[i] = rg->loutbuf[i] = rg->rinprebuf[i] = rg->routbuf[i] = 0.;
+
+	switch ( (int)(samplefreq) )
+	{
+	case 48000: rg->freqindex = 0; break;
+	case 44100: rg->freqindex = 1; break;
+	case 32000: rg->freqindex = 2; break;
+	case 24000: rg->freqindex = 3; break;
+	case 22050: rg->freqindex = 4; break;
+	case 16000: rg->freqindex = 5; break;
+	case 12000: rg->freqindex = 6; break;
+	case 11025: rg->freqindex = 7; break;
+	case 8000: rg->freqindex = 8; break;
+	case 18900: rg->freqindex = 9; break;
+	case 37800: rg->freqindex = 10; break;
+	case 56000: rg->freqindex = 11; break;
+	case 64000: rg->freqindex = 12; break;
+	case 88200: rg->freqindex = 13; break;
+	case 96000: rg->freqindex = 14; break;
+	case 112000: rg->freqindex = 15; break;
+	case 128000: rg->freqindex = 16; break;
+	case 144000: rg->freqindex = 17; break;
+	case 176400: rg->freqindex = 18; break;
+	case 192000: rg->freqindex = 19; break;
+	default: return INIT_GAIN_ANALYSIS_ERROR;
+	}
+
+	rg->sampleWindow = (int) ceil (samplefreq * RMS_WINDOW_TIME);
+
+	rg->lsum = 0.;
+	rg->rsum = 0.;
+	rg->totsamp = 0;
+
+	// TODO: ippsZero_32f
+	memset ( rg->A, 0, sizeof(rg->A) );
+
+	if (rg->butter_iir)
+		nsutil_iir_Destroy_F32(rg->butter_iir);
+
+	if (rg->yule_iir)
+		nsutil_iir_Destroy_F32(rg->yule_iir);
+
+	nsutil_iir_Create_F32(ABButter[rg->freqindex], 2, &rg->butter_iir);
+	nsutil_iir_Create_F32(ABYule[rg->freqindex], 10, &rg->yule_iir);
+
+	return INIT_GAIN_ANALYSIS_OK;
+}
+
+DLLEXPORT int WAInitGainAnalysis(void *context,  long samplefreq)
+{
+	ReplayGainContext *rg=context;
+
+	if (WAResetSampleFrequency(context, samplefreq) != INIT_GAIN_ANALYSIS_OK)
+	{
+		return INIT_GAIN_ANALYSIS_ERROR;
+	}
+
+	rg->linpre = rg->linprebuf + MAX_ORDER;
+	rg->rinpre = rg->rinprebuf + MAX_ORDER;
+	rg->lout = rg->loutbuf + MAX_ORDER;
+	rg->rout = rg->routbuf + MAX_ORDER;
+
+	// TODO: ippsZero_32f
+	memset ( rg->B, 0, sizeof(rg->B) );
+
+
+	return INIT_GAIN_ANALYSIS_OK;
+}
+
+// returns GAIN_ANALYSIS_OK if successful, GAIN_ANALYSIS_ERROR if not
+
+static __inline double fsqr(const double d)
+{
+	return d*d;
+}
+
+DLLEXPORT
+int WAAnalyzeSamples(void *context, const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels)
+{
+	ReplayGainContext *rg=context;
+	const Float_t* curleft;
+	const Float_t* curright;
+	float left_rms, right_rms;
+	size_t batchsamples;
+	size_t cursamplepos;
+
+	if ( num_samples == 0 )
+		return GAIN_ANALYSIS_OK;
+
+	cursamplepos = 0;
+	batchsamples = num_samples;
+
+	switch ( num_channels)
+	{
+	case 1: right_samples = left_samples;
+	case 2: break;
+	default: return GAIN_ANALYSIS_ERROR;
+	}
+
+	if ( num_samples < MAX_ORDER )
+	{
+		memcpy ( rg->linprebuf + MAX_ORDER, left_samples , num_samples * sizeof(Float_t) );
+		memcpy ( rg->rinprebuf + MAX_ORDER, right_samples, num_samples * sizeof(Float_t) );
+	}
+	else
+	{
+		memcpy ( rg->linprebuf + MAX_ORDER, left_samples, MAX_ORDER * sizeof(Float_t) );
+		memcpy ( rg->rinprebuf + MAX_ORDER, right_samples, MAX_ORDER * sizeof(Float_t) );
+	}
+
+	while ( batchsamples > 0 )
+	{
+		size_t cursamples = batchsamples > rg->sampleWindow - rg->totsamp ? rg->sampleWindow - rg->totsamp : batchsamples;
+		if ( cursamplepos < MAX_ORDER )
+		{
+			curleft = rg->linpre + cursamplepos;
+			curright = rg->rinpre + cursamplepos;
+			if (cursamples > MAX_ORDER - cursamplepos )
+				cursamples = MAX_ORDER - cursamplepos;
+		}
+		else
+		{
+			curleft = left_samples + cursamplepos;
+			curright = right_samples + cursamplepos;
+		}
+
+		YULE_FILTER( rg->yule_iir, curleft , rg->lout + rg->totsamp, cursamples);
+		YULE_FILTER( rg->yule_iir, curright, rg->rout + rg->totsamp, cursamples);
+
+		BUTTER_FILTER(rg->butter_iir, rg->lout + rg->totsamp, cursamples);
+		BUTTER_FILTER(rg->butter_iir, rg->rout + rg->totsamp, cursamples);
+
+		curleft = rg->lout + rg->totsamp;                   // Get the squared values
+		curright = rg->rout + rg->totsamp;
+
+		nsutil_stats_RMS_F32(curleft, cursamples, &left_rms);
+		nsutil_stats_RMS_F32(curright, cursamples, &right_rms);
+		rg->lsum += left_rms*left_rms;
+		rg->rsum += right_rms*right_rms;
+
+		batchsamples -= cursamples;
+		cursamplepos += cursamples;
+		rg->totsamp += cursamples;
+		if ( rg->totsamp == rg->sampleWindow )
+		{  // Get the Root Mean Square (RMS) for this set of samples
+			double val = STEPS_per_dB * 10. * log10 ( (rg->lsum + rg->rsum) / rg->totsamp * 0.5 + 1.e-37 );
+			int ival = (int) val;
+			if ( ival < 0 ) ival = 0;
+			if ( ival >= (int)(sizeof(rg->A) / sizeof(*(rg->A))) ) ival = sizeof(rg->A) / sizeof(*(rg->A)) - 1;
+			rg->A [ival]++;
+			rg->lsum = rg->rsum = 0.;
+			memmove ( rg->loutbuf , rg->loutbuf + rg->totsamp, MAX_ORDER * sizeof(Float_t) );
+			memmove ( rg->routbuf , rg->routbuf + rg->totsamp, MAX_ORDER * sizeof(Float_t) );
+			rg->totsamp = 0;
+		}
+		if ( rg->totsamp > rg->sampleWindow )   // somehow I really screwed up: Error in programming! Contact author about totsamp > sampleWindow
+			return GAIN_ANALYSIS_ERROR;
+	}
+	if ( num_samples < MAX_ORDER )
+	{
+		memmove ( rg->linprebuf, rg->linprebuf + num_samples, (MAX_ORDER - num_samples) * sizeof(Float_t) );
+		memmove ( rg->rinprebuf, rg->rinprebuf + num_samples, (MAX_ORDER - num_samples) * sizeof(Float_t) );
+		memcpy ( rg->linprebuf + MAX_ORDER - num_samples, left_samples, num_samples * sizeof(Float_t) );
+		memcpy ( rg->rinprebuf + MAX_ORDER - num_samples, right_samples, num_samples * sizeof(Float_t) );
+	}
+	else
+	{
+		memcpy ( rg->linprebuf, left_samples + num_samples - MAX_ORDER, MAX_ORDER * sizeof(Float_t) );
+		memcpy ( rg->rinprebuf, right_samples + num_samples - MAX_ORDER, MAX_ORDER * sizeof(Float_t) );
+	}
+
+	return GAIN_ANALYSIS_OK;
+}
+
+
+static Float_t analyzeResult(Uint32_t* Array, size_t len)
+{
+	Uint32_t elems;
+	Int32_t upper;
+	size_t i;
+
+	elems = 0;
+	for ( i = 0; i < len; i++ )
+		elems += Array[i];
+	if ( elems == 0 )
+		return GAIN_NOT_ENOUGH_SAMPLES;
+
+	upper = (Int32_t) ceil (elems * (1. - RMS_PERCENTILE));
+	for ( i = len; i-- > 0; )
+	{
+		if ( (upper -= Array[i]) <= 0 )
+			break;
+	}
+
+	return (Float_t) ((Float_t)PINK_REF - (Float_t)i / (Float_t)STEPS_per_dB);
+}
+
+
+DLLEXPORT Float_t WAGetTitleGain(void *context)
+{
+	ReplayGainContext *rg=context;
+	Float_t retval;
+	int i;
+
+	retval = analyzeResult ( rg->A, sizeof(rg->A) / sizeof(*(rg->A)) );
+
+	for ( i = 0; i < (int)(sizeof(rg->A) / sizeof(*(rg->A))); i++ )
+	{
+		// TODO: ippsAdd_32f_I
+		rg->B[i] += rg->A[i];
+		rg->A[i] = 0;
+	}
+
+	for ( i = 0; i < MAX_ORDER; i++ )
+		rg->linprebuf[i] =  rg->loutbuf[i] = rg->rinprebuf[i] = rg->routbuf[i] = 0.f;
+
+	nsutil_iir_Reset_F32(rg->yule_iir);
+	nsutil_iir_Reset_F32(rg->butter_iir);
+	rg->totsamp = 0;
+	rg->lsum = rg->rsum = 0.;
+	return retval;
+}
+
+
+DLLEXPORT Float_t WAGetAlbumGain(void *context)
+{
+	ReplayGainContext *rg=context;
+	return analyzeResult(rg->B, sizeof(rg->B) / sizeof(*(rg->B)) );
+}
+
+DLLEXPORT void *WACreateRGContext()
+{
+	return calloc(1, sizeof(ReplayGainContext));
+}
+DLLEXPORT	void WAFreeRGContext(void *context)
+{
+	free(context);
+}
+
+/* end of gain_analysis.c */
diff --git a/Src/ReplayGainAnalysis/gain_analysis.h b/Src/ReplayGainAnalysis/gain_analysis.h
new file mode 100644
index 00000000..7127079b
--- /dev/null
+++ b/Src/ReplayGainAnalysis/gain_analysis.h
@@ -0,0 +1,61 @@
+/*
+*  ReplayGainAnalysis - analyzes input samples and give the recommended dB change
+*  Copyright (C) 2001 David Robinson and Glen Sawyer
+*
+*  This library is free software; you can redistribute it and/or
+*  modify it under the terms of the GNU Lesser General Public
+*  License as published by the Free Software Foundation; either
+*  version 2.1 of the License, or (at your option) any later version.
+*
+*  This library 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.  See the GNU
+*  Lesser General Public License for more details.
+*
+*  You should have received a copy of the GNU Lesser General Public
+*  License along with this library; if not, write to the Free Software
+*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*
+*  concept and filter values by David Robinson (David@Robinson.org)
+*    -- blame him if you think the idea is flawed
+*  coding by Glen Sawyer (mp3gain@hotmail.com) 735 W 255 N, Orem, UT 84057-4505 USA
+*    -- blame him if you think this runs too slowly, or the coding is otherwise flawed
+*
+*  For an explanation of the concepts and the basic algorithms involved, go to:
+*    http://www.replaygain.org/
+*/
+
+#ifndef GAIN_ANALYSIS_H
+#define GAIN_ANALYSIS_H
+
+#include <stddef.h>
+#include <bfc/platform/export.h>
+
+#define GAIN_NOT_ENOUGH_SAMPLES  -24601
+#define GAIN_ANALYSIS_ERROR           0
+#define GAIN_ANALYSIS_OK              1
+
+#define INIT_GAIN_ANALYSIS_ERROR      0
+#define INIT_GAIN_ANALYSIS_OK         1
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+	typedef float Float_t;         // Type used for filtering
+
+	DLLEXPORT void * WACreateRGContext();
+	DLLEXPORT void WAFreeRGContext(void *context);
+
+	int DLLEXPORT WAInitGainAnalysis(void *context, long samplefreq);
+	int DLLEXPORT WAAnalyzeSamples(void *context, const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels);
+	int	DLLEXPORT WAResetSampleFrequency ( void *context, long samplefreq );
+	Float_t DLLEXPORT WAGetTitleGain(void *context);
+	Float_t DLLEXPORT WAGetAlbumGain(void *context);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GAIN_ANALYSIS_H */
diff --git a/Src/ReplayGainAnalysis/resource.h b/Src/ReplayGainAnalysis/resource.h
new file mode 100644
index 00000000..2c6d38cd
--- /dev/null
+++ b/Src/ReplayGainAnalysis/resource.h
@@ -0,0 +1,14 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by ReplayGainAnalysis.rc
+
+// Next default values for new objects
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        101
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif
diff --git a/Src/ReplayGainAnalysis/version.rc2 b/Src/ReplayGainAnalysis/version.rc2
new file mode 100644
index 00000000..b45b8fde
--- /dev/null
+++ b/Src/ReplayGainAnalysis/version.rc2
@@ -0,0 +1,38 @@
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Version
+//
+#include "../Winamp/buildType.h"
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION WINAMP_PRODUCTVER
+ PRODUCTVERSION WINAMP_PRODUCTVER
+ FILEFLAGSMASK 0x17L
+#ifdef _DEBUG
+ FILEFLAGS 0x1L
+#else
+ FILEFLAGS 0x0L
+#endif
+ FILEOS 0x4L
+ FILETYPE 0x2L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "CompanyName", "Winamp SA"
+            VALUE "FileDescription", "Winamp Support Library"
+            VALUE "FileVersion", STR_WINAMP_PRODUCTVER
+            VALUE "InternalName", "ReplayGainAnalysis.dll"
+            VALUE "LegalTrademarks", "Nullsoft and Winamp are trademarks of Winamp SA"
+            VALUE "OriginalFilename", "ReplayGainAnalysis.dll"
+            VALUE "ProductName", "Winamp Support Library"
+            VALUE "ProductVersion", STR_WINAMP_PRODUCTVER
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1200
+    END
+END