Index: breplaygain/CMakeLists.txt =================================================================== --- /libreplaygain/CMakeLists.txt (revision 229) +++ (revision ) @@ -1,2 +1,0 @@ -include_directories(${libmpc_SOURCE_DIR}/include) -add_library(replaygain_static STATIC gain_analysis) Index: breplaygain/Makefile.am =================================================================== --- /libreplaygain/Makefile.am (revision 229) +++ (revision ) @@ -1,6 +1,0 @@ -INCLUDES = -I$(top_srcdir)/include -METASOURCES = AUTO -lib_LTLIBRARIES = libreplaygain.la -libreplaygain_la_LDFLAGS = -no-undefined -version-info 1:0:0 -libreplaygain_la_SOURCES = gain_analysis.c - Index: breplaygain/gain_analysis.c =================================================================== --- /libreplaygain/gain_analysis.c (revision 229) +++ (revision ) @@ -1,472 +1,0 @@ -/* - * 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 Mller - * - * 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 number of previous samples - * AND up to 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. - */ - -#include -#include -#include -#include - -#include - -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 YULE_FILTER filterYule -#define BUTTER_FILTER filterButter -#define RMS_PERCENTILE 0.95 // percentile which is louder than the proposed level -#define MAX_SAMP_FREQ 48000. // 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 - -Float_t linprebuf [MAX_ORDER * 2]; -Float_t* linpre; // left input samples, with pre-buffer -Float_t lstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; -Float_t* lstep; // left "first step" (i.e. post first filter) samples -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 rstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; -Float_t* rstep; -Float_t routbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; -Float_t* rout; -long sampleWindow; // number of samples required to reach number of milliseconds required for RMS window -long totsamp; -double lsum; -double rsum; -int freqindex; -int first; -static Uint32_t A [(size_t)(STEPS_per_dB * MAX_dB)]; -static Uint32_t B [(size_t)(STEPS_per_dB * MAX_dB)]; - -// for each filter: -// [0] 48 kHz, [1] 44.1 kHz, [2] 32 kHz, [3] 24 kHz, [4] 22050 Hz, [5] 16 kHz, [6] 12 kHz, [7] is 11025 Hz, [8] 8 kHz - -#ifdef WIN32 -#ifndef __GNUC__ -#pragma warning ( disable : 4305 ) -#endif -#endif - -static const Float_t ABYule[9][2*YULE_ORDER + 1] = { - {0.03857599435200, -3.84664617118067, -0.02160367184185, 7.81501653005538, -0.00123395316851,-11.34170355132042, -0.00009291677959, 13.05504219327545, -0.01655260341619,-12.28759895145294, 0.02161526843274, 9.48293806319790, -0.02074045215285, -5.87257861775999, 0.00594298065125, 2.75465861874613, 0.00306428023191, -0.86984376593551, 0.00012025322027, 0.13919314567432, 0.00288463683916 }, - {0.05418656406430, -3.47845948550071, -0.02911007808948, 6.36317777566148, -0.00848709379851, -8.54751527471874, -0.00851165645469, 9.47693607801280, -0.00834990904936, -8.81498681370155, 0.02245293253339, 6.85401540936998, -0.02596338512915, -4.39470996079559, 0.01624864962975, 2.19611684890774, -0.00240879051584, -0.75104302451432, 0.00674613682247, 0.13149317958808, -0.00187763777362 }, - {0.15457299681924, -2.37898834973084, -0.09331049056315, 2.84868151156327, -0.06247880153653, -2.64577170229825, 0.02163541888798, 2.23697657451713, -0.05588393329856, -1.67148153367602, 0.04781476674921, 1.00595954808547, 0.00222312597743, -0.45953458054983, 0.03174092540049, 0.16378164858596, -0.01390589421898, -0.05032077717131, 0.00651420667831, 0.02347897407020, -0.00881362733839 }, - {0.30296907319327, -1.61273165137247, -0.22613988682123, 1.07977492259970, -0.08587323730772, -0.25656257754070, 0.03282930172664, -0.16276719120440, -0.00915702933434, -0.22638893773906, -0.02364141202522, 0.39120800788284, -0.00584456039913, -0.22138138954925, 0.06276101321749, 0.04500235387352, -0.00000828086748, 0.02005851806501, 0.00205861885564, 0.00302439095741, -0.02950134983287 }, - {0.33642304856132, -1.49858979367799, -0.25572241425570, 0.87350271418188, -0.11828570177555, 0.12205022308084, 0.11921148675203, -0.80774944671438, -0.07834489609479, 0.47854794562326, -0.00469977914380, -0.12453458140019, -0.00589500224440, -0.04067510197014, 0.05724228140351, 0.08333755284107, 0.00832043980773, -0.04237348025746, -0.01635381384540, 0.02977207319925, -0.01760176568150 }, - {0.44915256608450, -0.62820619233671, -0.14351757464547, 0.29661783706366, -0.22784394429749, -0.37256372942400, -0.01419140100551, 0.00213767857124, 0.04078262797139, -0.42029820170918, -0.12398163381748, 0.22199650564824, 0.04097565135648, 0.00613424350682, 0.10478503600251, 0.06747620744683, -0.01863887810927, 0.05784820375801, -0.03193428438915, 0.03222754072173, 0.00541907748707 }, - {0.56619470757641, -1.04800335126349, -0.75464456939302, 0.29156311971249, 0.16242137742230, -0.26806001042947, 0.16744243493672, 0.00819999645858, -0.18901604199609, 0.45054734505008, 0.30931782841830, -0.33032403314006, -0.27562961986224, 0.06739368333110, 0.00647310677246, -0.04784254229033, 0.08647503780351, 0.01639907836189, -0.03788984554840, 0.01807364323573, -0.00588215443421 }, - {0.58100494960553, -0.51035327095184, -0.53174909058578, -0.31863563325245, -0.14289799034253, -0.20256413484477, 0.17520704835522, 0.14728154134330, 0.02377945217615, 0.38952639978999, 0.15558449135573, -0.23313271880868, -0.25344790059353, -0.05246019024463, 0.01628462406333, -0.02505961724053, 0.06920467763959, 0.02442357316099, -0.03721611395801, 0.01818801111503, -0.00749618797172 }, - {0.53648789255105, -0.25049871956020, -0.42163034350696, -0.43193942311114, -0.00275953611929, -0.03424681017675, 0.04267842219415, -0.04678328784242, -0.10214864179676, 0.26408300200955, 0.14590772289388, 0.15113130533216, -0.02459864859345, -0.17556493366449, -0.11202315195388, -0.18823009262115, -0.04060034127000, 0.05477720428674, 0.04788665548180, 0.04704409688120, -0.02217936801134 } -}; - -static const Float_t ABButter[9][2*BUTTER_ORDER + 1] = { - {0.98621192462708, -1.97223372919527, -1.97242384925416, 0.97261396931306, 0.98621192462708 }, - {0.98500175787242, -1.96977855582618, -1.97000351574484, 0.97022847566350, 0.98500175787242 }, - {0.97938932735214, -1.95835380975398, -1.95877865470428, 0.95920349965459, 0.97938932735214 }, - {0.97531843204928, -1.95002759149878, -1.95063686409857, 0.95124613669835, 0.97531843204928 }, - {0.97316523498161, -1.94561023566527, -1.94633046996323, 0.94705070426118, 0.97316523498161 }, - {0.96454515552826, -1.92783286977036, -1.92909031105652, 0.93034775234268, 0.96454515552826 }, - {0.96009142950541, -1.91858953033784, -1.92018285901082, 0.92177618768381, 0.96009142950541 }, - {0.95856916599601, -1.91542108074780, -1.91713833199203, 0.91885558323625, 0.95856916599601 }, - {0.94597685600279, -1.88903307939452, -1.89195371200558, 0.89487434461664, 0.94597685600279 } -}; - - -#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 -filterYule (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel) -{ - - while (nSamples--) { - *output = 1e-10 /* 1e-10 is a hack to avoid slowdown because of denormals */ - + input [0] * kernel[0] - - output[-1] * kernel[1] - + input [-1] * kernel[2] - - output[-2] * kernel[3] - + input [-2] * kernel[4] - - output[-3] * kernel[5] - + input [-3] * kernel[6] - - output[-4] * kernel[7] - + input [-4] * kernel[8] - - output[-5] * kernel[9] - + input [-5] * kernel[10] - - output[-6] * kernel[11] - + input [-6] * kernel[12] - - output[-7] * kernel[13] - + input [-7] * kernel[14] - - output[-8] * kernel[15] - + input [-8] * kernel[16] - - output[-9] * kernel[17] - + input [-9] * kernel[18] - - output[-10]* kernel[19] - + input [-10]* kernel[20]; - ++output; - ++input; - } -} - -static void -filterButter (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel) -{ - - while (nSamples--) { - *output = - input [0] * kernel[0] - - output[-1] * kernel[1] - + input [-1] * kernel[2] - - output[-2] * kernel[3] - + input [-2] * kernel[4]; - ++output; - ++input; - } -} - - -// returns a INIT_GAIN_ANALYSIS_OK if successful, INIT_GAIN_ANALYSIS_ERROR if not - -int -ResetSampleFrequency ( long samplefreq ) { - int i; - - // zero out initial values - for ( i = 0; i < MAX_ORDER; i++ ) - linprebuf[i] = lstepbuf[i] = loutbuf[i] = rinprebuf[i] = rstepbuf[i] = routbuf[i] = 0.; - - switch ( (int)(samplefreq) ) { - case 48000: freqindex = 0; break; - case 44100: freqindex = 1; break; - case 32000: freqindex = 2; break; - case 24000: freqindex = 3; break; - case 22050: freqindex = 4; break; - case 16000: freqindex = 5; break; - case 12000: freqindex = 6; break; - case 11025: freqindex = 7; break; - case 8000: freqindex = 8; break; - default: return INIT_GAIN_ANALYSIS_ERROR; - } - - sampleWindow = (int) ceil (samplefreq * RMS_WINDOW_TIME); - - lsum = 0.; - rsum = 0.; - totsamp = 0; - - memset ( A, 0, sizeof(A) ); - - return INIT_GAIN_ANALYSIS_OK; -} - -int -InitGainAnalysis ( long samplefreq ) -{ - if (ResetSampleFrequency(samplefreq) != INIT_GAIN_ANALYSIS_OK) { - return INIT_GAIN_ANALYSIS_ERROR; - } - - linpre = linprebuf + MAX_ORDER; - rinpre = rinprebuf + MAX_ORDER; - lstep = lstepbuf + MAX_ORDER; - rstep = rstepbuf + MAX_ORDER; - lout = loutbuf + MAX_ORDER; - rout = routbuf + MAX_ORDER; - - memset ( B, 0, sizeof(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; -} - -int -AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ) -{ - const Float_t* curleft; - const Float_t* curright; - long batchsamples; - long cursamples; - long cursamplepos; - int i; - - 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 ( linprebuf + MAX_ORDER, left_samples , num_samples * sizeof(Float_t) ); - memcpy ( rinprebuf + MAX_ORDER, right_samples, num_samples * sizeof(Float_t) ); - } - else { - memcpy ( linprebuf + MAX_ORDER, left_samples, MAX_ORDER * sizeof(Float_t) ); - memcpy ( rinprebuf + MAX_ORDER, right_samples, MAX_ORDER * sizeof(Float_t) ); - } - - while ( batchsamples > 0 ) { - cursamples = batchsamples > sampleWindow-totsamp ? sampleWindow - totsamp : batchsamples; - if ( cursamplepos < MAX_ORDER ) { - curleft = linpre+cursamplepos; - curright = rinpre+cursamplepos; - if (cursamples > MAX_ORDER - cursamplepos ) - cursamples = MAX_ORDER - cursamplepos; - } - else { - curleft = left_samples + cursamplepos; - curright = right_samples + cursamplepos; - } - - YULE_FILTER ( curleft , lstep + totsamp, cursamples, ABYule[freqindex]); - YULE_FILTER ( curright, rstep + totsamp, cursamples, ABYule[freqindex]); - - BUTTER_FILTER ( lstep + totsamp, lout + totsamp, cursamples, ABButter[freqindex]); - BUTTER_FILTER ( rstep + totsamp, rout + totsamp, cursamples, ABButter[freqindex]); - - curleft = lout + totsamp; // Get the squared values - curright = rout + totsamp; - - i = cursamples % 16; - while (i--) - { lsum += fsqr(*curleft++); - rsum += fsqr(*curright++); - } - i = cursamples / 16; - while (i--) - { lsum += fsqr(curleft[0]) - + fsqr(curleft[1]) - + fsqr(curleft[2]) - + fsqr(curleft[3]) - + fsqr(curleft[4]) - + fsqr(curleft[5]) - + fsqr(curleft[6]) - + fsqr(curleft[7]) - + fsqr(curleft[8]) - + fsqr(curleft[9]) - + fsqr(curleft[10]) - + fsqr(curleft[11]) - + fsqr(curleft[12]) - + fsqr(curleft[13]) - + fsqr(curleft[14]) - + fsqr(curleft[15]); - curleft += 16; - rsum += fsqr(curright[0]) - + fsqr(curright[1]) - + fsqr(curright[2]) - + fsqr(curright[3]) - + fsqr(curright[4]) - + fsqr(curright[5]) - + fsqr(curright[6]) - + fsqr(curright[7]) - + fsqr(curright[8]) - + fsqr(curright[9]) - + fsqr(curright[10]) - + fsqr(curright[11]) - + fsqr(curright[12]) - + fsqr(curright[13]) - + fsqr(curright[14]) - + fsqr(curright[15]); - curright += 16; - } - - batchsamples -= cursamples; - cursamplepos += cursamples; - totsamp += cursamples; - if ( totsamp == sampleWindow ) { // Get the Root Mean Square (RMS) for this set of samples - double val = STEPS_per_dB * 10. * log10 ( (lsum+rsum) / totsamp * 0.5 + 1.e-37 ); - int ival = (int) val; - if ( ival < 0 ) ival = 0; - if ( ival >= (int)(sizeof(A)/sizeof(*A)) ) ival = sizeof(A)/sizeof(*A) - 1; - A [ival]++; - lsum = rsum = 0.; - memmove ( loutbuf , loutbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); - memmove ( routbuf , routbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); - memmove ( lstepbuf, lstepbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); - memmove ( rstepbuf, rstepbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); - totsamp = 0; - } - if ( totsamp > sampleWindow ) // somehow I really screwed up: Error in programming! Contact author about totsamp > sampleWindow - return GAIN_ANALYSIS_ERROR; - } - if ( num_samples < MAX_ORDER ) { - memmove ( linprebuf, linprebuf + num_samples, (MAX_ORDER-num_samples) * sizeof(Float_t) ); - memmove ( rinprebuf, rinprebuf + num_samples, (MAX_ORDER-num_samples) * sizeof(Float_t) ); - memcpy ( linprebuf + MAX_ORDER - num_samples, left_samples, num_samples * sizeof(Float_t) ); - memcpy ( rinprebuf + MAX_ORDER - num_samples, right_samples, num_samples * sizeof(Float_t) ); - } - else { - memcpy ( linprebuf, left_samples + num_samples - MAX_ORDER, MAX_ORDER * sizeof(Float_t) ); - memcpy ( 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)i / (Float_t)STEPS_per_dB; -} - - -Float_t -GetTitleGain ( void ) -{ - Float_t retval; - int i; - - retval = analyzeResult ( A, sizeof(A)/sizeof(*A) ); - - for ( i = 0; i < (int)(sizeof(A)/sizeof(*A)); i++ ) { - B[i] += A[i]; - A[i] = 0; - } - - for ( i = 0; i < MAX_ORDER; i++ ) - linprebuf[i] = lstepbuf[i] = loutbuf[i] = rinprebuf[i] = rstepbuf[i] = routbuf[i] = 0.f; - - totsamp = 0; - lsum = rsum = 0.; - return retval; -} - - -Float_t -GetAlbumGain ( void ) -{ - return analyzeResult ( B, sizeof(B)/sizeof(*B) ); -} - -/* end of gain_analysis.c */ Index: breplaygain/include/gain_analysis.h =================================================================== --- /libreplaygain/include/gain_analysis.h (revision 229) +++ (revision ) @@ -1,56 +1,0 @@ -/* - * 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 - -#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 double Float_t; // Type used for filtering - -int InitGainAnalysis ( long samplefreq ); -int AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ); -int ResetSampleFrequency ( long samplefreq ); -Float_t GetTitleGain ( void ); -Float_t GetAlbumGain ( void ); - -#ifdef __cplusplus -} -#endif - -#endif /* GAIN_ANALYSIS_H */ Index: /libreplaygain/include/replaygain/gain_analysis.h =================================================================== --- /libreplaygain/include/replaygain/gain_analysis.h (revision 230) +++ /libreplaygain/include/replaygain/gain_analysis.h (revision 230) @@ -0,0 +1,56 @@ +/* + * 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 + +#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 double Float_t; // Type used for filtering + +int InitGainAnalysis ( long samplefreq ); +int AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ); +int ResetSampleFrequency ( long samplefreq ); +Float_t GetTitleGain ( void ); +Float_t GetAlbumGain ( void ); + +#ifdef __cplusplus +} +#endif + +#endif /* GAIN_ANALYSIS_H */ Index: /libreplaygain/src/CMakeLists.txt =================================================================== --- /libreplaygain/src/CMakeLists.txt (revision 230) +++ /libreplaygain/src/CMakeLists.txt (revision 230) @@ -0,0 +1,2 @@ +include_directories(${libmpc_SOURCE_DIR}/include) +add_library(replaygain_static STATIC gain_analysis) Index: /libreplaygain/src/Makefile.am =================================================================== --- /libreplaygain/src/Makefile.am (revision 230) +++ /libreplaygain/src/Makefile.am (revision 230) @@ -0,0 +1,6 @@ +INCLUDES = -I$(top_srcdir)/include +METASOURCES = AUTO +lib_LTLIBRARIES = libreplaygain.la +libreplaygain_la_LDFLAGS = -no-undefined -version-info 1:0:0 +libreplaygain_la_SOURCES = gain_analysis.c + Index: /libreplaygain/src/gain_analysis.c =================================================================== --- /libreplaygain/src/gain_analysis.c (revision 230) +++ /libreplaygain/src/gain_analysis.c (revision 230) @@ -0,0 +1,472 @@ +/* + * 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 Mller + * + * 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 number of previous samples + * AND up to 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. + */ + +#include +#include +#include +#include + +#include + +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 YULE_FILTER filterYule +#define BUTTER_FILTER filterButter +#define RMS_PERCENTILE 0.95 // percentile which is louder than the proposed level +#define MAX_SAMP_FREQ 48000. // 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 + +Float_t linprebuf [MAX_ORDER * 2]; +Float_t* linpre; // left input samples, with pre-buffer +Float_t lstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; +Float_t* lstep; // left "first step" (i.e. post first filter) samples +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 rstepbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; +Float_t* rstep; +Float_t routbuf [MAX_SAMPLES_PER_WINDOW + MAX_ORDER]; +Float_t* rout; +long sampleWindow; // number of samples required to reach number of milliseconds required for RMS window +long totsamp; +double lsum; +double rsum; +int freqindex; +int first; +static Uint32_t A [(size_t)(STEPS_per_dB * MAX_dB)]; +static Uint32_t B [(size_t)(STEPS_per_dB * MAX_dB)]; + +// for each filter: +// [0] 48 kHz, [1] 44.1 kHz, [2] 32 kHz, [3] 24 kHz, [4] 22050 Hz, [5] 16 kHz, [6] 12 kHz, [7] is 11025 Hz, [8] 8 kHz + +#ifdef WIN32 +#ifndef __GNUC__ +#pragma warning ( disable : 4305 ) +#endif +#endif + +static const Float_t ABYule[9][2*YULE_ORDER + 1] = { + {0.03857599435200, -3.84664617118067, -0.02160367184185, 7.81501653005538, -0.00123395316851,-11.34170355132042, -0.00009291677959, 13.05504219327545, -0.01655260341619,-12.28759895145294, 0.02161526843274, 9.48293806319790, -0.02074045215285, -5.87257861775999, 0.00594298065125, 2.75465861874613, 0.00306428023191, -0.86984376593551, 0.00012025322027, 0.13919314567432, 0.00288463683916 }, + {0.05418656406430, -3.47845948550071, -0.02911007808948, 6.36317777566148, -0.00848709379851, -8.54751527471874, -0.00851165645469, 9.47693607801280, -0.00834990904936, -8.81498681370155, 0.02245293253339, 6.85401540936998, -0.02596338512915, -4.39470996079559, 0.01624864962975, 2.19611684890774, -0.00240879051584, -0.75104302451432, 0.00674613682247, 0.13149317958808, -0.00187763777362 }, + {0.15457299681924, -2.37898834973084, -0.09331049056315, 2.84868151156327, -0.06247880153653, -2.64577170229825, 0.02163541888798, 2.23697657451713, -0.05588393329856, -1.67148153367602, 0.04781476674921, 1.00595954808547, 0.00222312597743, -0.45953458054983, 0.03174092540049, 0.16378164858596, -0.01390589421898, -0.05032077717131, 0.00651420667831, 0.02347897407020, -0.00881362733839 }, + {0.30296907319327, -1.61273165137247, -0.22613988682123, 1.07977492259970, -0.08587323730772, -0.25656257754070, 0.03282930172664, -0.16276719120440, -0.00915702933434, -0.22638893773906, -0.02364141202522, 0.39120800788284, -0.00584456039913, -0.22138138954925, 0.06276101321749, 0.04500235387352, -0.00000828086748, 0.02005851806501, 0.00205861885564, 0.00302439095741, -0.02950134983287 }, + {0.33642304856132, -1.49858979367799, -0.25572241425570, 0.87350271418188, -0.11828570177555, 0.12205022308084, 0.11921148675203, -0.80774944671438, -0.07834489609479, 0.47854794562326, -0.00469977914380, -0.12453458140019, -0.00589500224440, -0.04067510197014, 0.05724228140351, 0.08333755284107, 0.00832043980773, -0.04237348025746, -0.01635381384540, 0.02977207319925, -0.01760176568150 }, + {0.44915256608450, -0.62820619233671, -0.14351757464547, 0.29661783706366, -0.22784394429749, -0.37256372942400, -0.01419140100551, 0.00213767857124, 0.04078262797139, -0.42029820170918, -0.12398163381748, 0.22199650564824, 0.04097565135648, 0.00613424350682, 0.10478503600251, 0.06747620744683, -0.01863887810927, 0.05784820375801, -0.03193428438915, 0.03222754072173, 0.00541907748707 }, + {0.56619470757641, -1.04800335126349, -0.75464456939302, 0.29156311971249, 0.16242137742230, -0.26806001042947, 0.16744243493672, 0.00819999645858, -0.18901604199609, 0.45054734505008, 0.30931782841830, -0.33032403314006, -0.27562961986224, 0.06739368333110, 0.00647310677246, -0.04784254229033, 0.08647503780351, 0.01639907836189, -0.03788984554840, 0.01807364323573, -0.00588215443421 }, + {0.58100494960553, -0.51035327095184, -0.53174909058578, -0.31863563325245, -0.14289799034253, -0.20256413484477, 0.17520704835522, 0.14728154134330, 0.02377945217615, 0.38952639978999, 0.15558449135573, -0.23313271880868, -0.25344790059353, -0.05246019024463, 0.01628462406333, -0.02505961724053, 0.06920467763959, 0.02442357316099, -0.03721611395801, 0.01818801111503, -0.00749618797172 }, + {0.53648789255105, -0.25049871956020, -0.42163034350696, -0.43193942311114, -0.00275953611929, -0.03424681017675, 0.04267842219415, -0.04678328784242, -0.10214864179676, 0.26408300200955, 0.14590772289388, 0.15113130533216, -0.02459864859345, -0.17556493366449, -0.11202315195388, -0.18823009262115, -0.04060034127000, 0.05477720428674, 0.04788665548180, 0.04704409688120, -0.02217936801134 } +}; + +static const Float_t ABButter[9][2*BUTTER_ORDER + 1] = { + {0.98621192462708, -1.97223372919527, -1.97242384925416, 0.97261396931306, 0.98621192462708 }, + {0.98500175787242, -1.96977855582618, -1.97000351574484, 0.97022847566350, 0.98500175787242 }, + {0.97938932735214, -1.95835380975398, -1.95877865470428, 0.95920349965459, 0.97938932735214 }, + {0.97531843204928, -1.95002759149878, -1.95063686409857, 0.95124613669835, 0.97531843204928 }, + {0.97316523498161, -1.94561023566527, -1.94633046996323, 0.94705070426118, 0.97316523498161 }, + {0.96454515552826, -1.92783286977036, -1.92909031105652, 0.93034775234268, 0.96454515552826 }, + {0.96009142950541, -1.91858953033784, -1.92018285901082, 0.92177618768381, 0.96009142950541 }, + {0.95856916599601, -1.91542108074780, -1.91713833199203, 0.91885558323625, 0.95856916599601 }, + {0.94597685600279, -1.88903307939452, -1.89195371200558, 0.89487434461664, 0.94597685600279 } +}; + + +#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 +filterYule (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel) +{ + + while (nSamples--) { + *output = 1e-10 /* 1e-10 is a hack to avoid slowdown because of denormals */ + + input [0] * kernel[0] + - output[-1] * kernel[1] + + input [-1] * kernel[2] + - output[-2] * kernel[3] + + input [-2] * kernel[4] + - output[-3] * kernel[5] + + input [-3] * kernel[6] + - output[-4] * kernel[7] + + input [-4] * kernel[8] + - output[-5] * kernel[9] + + input [-5] * kernel[10] + - output[-6] * kernel[11] + + input [-6] * kernel[12] + - output[-7] * kernel[13] + + input [-7] * kernel[14] + - output[-8] * kernel[15] + + input [-8] * kernel[16] + - output[-9] * kernel[17] + + input [-9] * kernel[18] + - output[-10]* kernel[19] + + input [-10]* kernel[20]; + ++output; + ++input; + } +} + +static void +filterButter (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel) +{ + + while (nSamples--) { + *output = + input [0] * kernel[0] + - output[-1] * kernel[1] + + input [-1] * kernel[2] + - output[-2] * kernel[3] + + input [-2] * kernel[4]; + ++output; + ++input; + } +} + + +// returns a INIT_GAIN_ANALYSIS_OK if successful, INIT_GAIN_ANALYSIS_ERROR if not + +int +ResetSampleFrequency ( long samplefreq ) { + int i; + + // zero out initial values + for ( i = 0; i < MAX_ORDER; i++ ) + linprebuf[i] = lstepbuf[i] = loutbuf[i] = rinprebuf[i] = rstepbuf[i] = routbuf[i] = 0.; + + switch ( (int)(samplefreq) ) { + case 48000: freqindex = 0; break; + case 44100: freqindex = 1; break; + case 32000: freqindex = 2; break; + case 24000: freqindex = 3; break; + case 22050: freqindex = 4; break; + case 16000: freqindex = 5; break; + case 12000: freqindex = 6; break; + case 11025: freqindex = 7; break; + case 8000: freqindex = 8; break; + default: return INIT_GAIN_ANALYSIS_ERROR; + } + + sampleWindow = (int) ceil (samplefreq * RMS_WINDOW_TIME); + + lsum = 0.; + rsum = 0.; + totsamp = 0; + + memset ( A, 0, sizeof(A) ); + + return INIT_GAIN_ANALYSIS_OK; +} + +int +InitGainAnalysis ( long samplefreq ) +{ + if (ResetSampleFrequency(samplefreq) != INIT_GAIN_ANALYSIS_OK) { + return INIT_GAIN_ANALYSIS_ERROR; + } + + linpre = linprebuf + MAX_ORDER; + rinpre = rinprebuf + MAX_ORDER; + lstep = lstepbuf + MAX_ORDER; + rstep = rstepbuf + MAX_ORDER; + lout = loutbuf + MAX_ORDER; + rout = routbuf + MAX_ORDER; + + memset ( B, 0, sizeof(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; +} + +int +AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ) +{ + const Float_t* curleft; + const Float_t* curright; + long batchsamples; + long cursamples; + long cursamplepos; + int i; + + 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 ( linprebuf + MAX_ORDER, left_samples , num_samples * sizeof(Float_t) ); + memcpy ( rinprebuf + MAX_ORDER, right_samples, num_samples * sizeof(Float_t) ); + } + else { + memcpy ( linprebuf + MAX_ORDER, left_samples, MAX_ORDER * sizeof(Float_t) ); + memcpy ( rinprebuf + MAX_ORDER, right_samples, MAX_ORDER * sizeof(Float_t) ); + } + + while ( batchsamples > 0 ) { + cursamples = batchsamples > sampleWindow-totsamp ? sampleWindow - totsamp : batchsamples; + if ( cursamplepos < MAX_ORDER ) { + curleft = linpre+cursamplepos; + curright = rinpre+cursamplepos; + if (cursamples > MAX_ORDER - cursamplepos ) + cursamples = MAX_ORDER - cursamplepos; + } + else { + curleft = left_samples + cursamplepos; + curright = right_samples + cursamplepos; + } + + YULE_FILTER ( curleft , lstep + totsamp, cursamples, ABYule[freqindex]); + YULE_FILTER ( curright, rstep + totsamp, cursamples, ABYule[freqindex]); + + BUTTER_FILTER ( lstep + totsamp, lout + totsamp, cursamples, ABButter[freqindex]); + BUTTER_FILTER ( rstep + totsamp, rout + totsamp, cursamples, ABButter[freqindex]); + + curleft = lout + totsamp; // Get the squared values + curright = rout + totsamp; + + i = cursamples % 16; + while (i--) + { lsum += fsqr(*curleft++); + rsum += fsqr(*curright++); + } + i = cursamples / 16; + while (i--) + { lsum += fsqr(curleft[0]) + + fsqr(curleft[1]) + + fsqr(curleft[2]) + + fsqr(curleft[3]) + + fsqr(curleft[4]) + + fsqr(curleft[5]) + + fsqr(curleft[6]) + + fsqr(curleft[7]) + + fsqr(curleft[8]) + + fsqr(curleft[9]) + + fsqr(curleft[10]) + + fsqr(curleft[11]) + + fsqr(curleft[12]) + + fsqr(curleft[13]) + + fsqr(curleft[14]) + + fsqr(curleft[15]); + curleft += 16; + rsum += fsqr(curright[0]) + + fsqr(curright[1]) + + fsqr(curright[2]) + + fsqr(curright[3]) + + fsqr(curright[4]) + + fsqr(curright[5]) + + fsqr(curright[6]) + + fsqr(curright[7]) + + fsqr(curright[8]) + + fsqr(curright[9]) + + fsqr(curright[10]) + + fsqr(curright[11]) + + fsqr(curright[12]) + + fsqr(curright[13]) + + fsqr(curright[14]) + + fsqr(curright[15]); + curright += 16; + } + + batchsamples -= cursamples; + cursamplepos += cursamples; + totsamp += cursamples; + if ( totsamp == sampleWindow ) { // Get the Root Mean Square (RMS) for this set of samples + double val = STEPS_per_dB * 10. * log10 ( (lsum+rsum) / totsamp * 0.5 + 1.e-37 ); + int ival = (int) val; + if ( ival < 0 ) ival = 0; + if ( ival >= (int)(sizeof(A)/sizeof(*A)) ) ival = sizeof(A)/sizeof(*A) - 1; + A [ival]++; + lsum = rsum = 0.; + memmove ( loutbuf , loutbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); + memmove ( routbuf , routbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); + memmove ( lstepbuf, lstepbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); + memmove ( rstepbuf, rstepbuf + totsamp, MAX_ORDER * sizeof(Float_t) ); + totsamp = 0; + } + if ( totsamp > sampleWindow ) // somehow I really screwed up: Error in programming! Contact author about totsamp > sampleWindow + return GAIN_ANALYSIS_ERROR; + } + if ( num_samples < MAX_ORDER ) { + memmove ( linprebuf, linprebuf + num_samples, (MAX_ORDER-num_samples) * sizeof(Float_t) ); + memmove ( rinprebuf, rinprebuf + num_samples, (MAX_ORDER-num_samples) * sizeof(Float_t) ); + memcpy ( linprebuf + MAX_ORDER - num_samples, left_samples, num_samples * sizeof(Float_t) ); + memcpy ( rinprebuf + MAX_ORDER - num_samples, right_samples, num_samples * sizeof(Float_t) ); + } + else { + memcpy ( linprebuf, left_samples + num_samples - MAX_ORDER, MAX_ORDER * sizeof(Float_t) ); + memcpy ( 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)i / (Float_t)STEPS_per_dB; +} + + +Float_t +GetTitleGain ( void ) +{ + Float_t retval; + int i; + + retval = analyzeResult ( A, sizeof(A)/sizeof(*A) ); + + for ( i = 0; i < (int)(sizeof(A)/sizeof(*A)); i++ ) { + B[i] += A[i]; + A[i] = 0; + } + + for ( i = 0; i < MAX_ORDER; i++ ) + linprebuf[i] = lstepbuf[i] = loutbuf[i] = rinprebuf[i] = rstepbuf[i] = routbuf[i] = 0.f; + + totsamp = 0; + lsum = rsum = 0.; + return retval; +} + + +Float_t +GetAlbumGain ( void ) +{ + return analyzeResult ( B, sizeof(B)/sizeof(*B) ); +} + +/* end of gain_analysis.c */