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Diffstat (limited to 'command/audio_gain_analysis.cpp')
| -rw-r--r-- | command/audio_gain_analysis.cpp | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/command/audio_gain_analysis.cpp b/command/audio_gain_analysis.cpp new file mode 100644 index 0000000..b5abf9b --- /dev/null +++ b/command/audio_gain_analysis.cpp @@ -0,0 +1,423 @@ +/* + * ReplayGainAnalysis - analyzes input samples and give the recommended dB change + * Copyright (C) 2001-2009 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. + * + * GetGain() + * + * will return the recommended dB level change for all samples analyzed + * SINCE THE LAST TIME you called InitGainAnalysis(). + * + */ + +/* + * 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. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> + +#include "audio_gain_analysis.h" + +const Float_t cMarkAdAudioGainAnalysis::ABYule[12][2*YULE_ORDER + 1] = +{ + {0.006471345933032, -7.22103125152679, -0.02567678242161, 24.7034187975904, 0.049805860704367, -52.6825833623896, -0.05823001743528, 77.4825736677539, 0.040611847441914, -82.0074753444205, -0.010912036887501, 63.1566097101925, -0.00901635868667, -34.889569769245, 0.012448886238123, 13.2126852760198, -0.007206683749426, -3.09445623301669, 0.002167156433951, 0.340344741393305, -0.000261819276949}, + {0.015415414474287, -7.19001570087017, -0.07691359399407, 24.4109412087159, 0.196677418516518, -51.6306373580801, -0.338855114128061, 75.3978476863163, 0.430094579594561, -79.4164552507386, -0.415015413747894, 61.0373661948115, 0.304942508151101, -33.7446462547014, -0.166191795926663, 12.8168791146274, 0.063198189938739, -3.01332198541437, -0.015003978694525, 0.223619893831468, 0.001748085184539}, + {0.021776466467053, -5.74819833657784, -0.062376961003801, 16.246507961894, 0.107731165328514, -29.9691822642542, -0.150994515142316, 40.027597579378, 0.170334807313632, -40.3209196052655, -0.157984942890531, 30.8542077487718, 0.121639833268721, -17.5965138737281, -0.074094040816409, 7.10690214103873, 0.031282852041061, -1.82175564515191, -0.00755421235941, 0.223619893831468, 0.00117925454213 }, + {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 } +}; + +const Float_t cMarkAdAudioGainAnalysis::ABButter[12][2*BUTTER_ORDER + 1] = +{ + {0.99308203517541, -1.98611621154089, -1.98616407035082, 0.986211929160751, 0.99308203517541 }, + {0.992472550461293,-1.98488843762334, -1.98494510092258, 0.979389350028798, 0.992472550461293}, + {0.989641019334721,-1.97917472731008, -1.97928203866944, 0.979389350028798, 0.989641019334721}, + {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 } +}; + +void cMarkAdAudioGainAnalysis::filterYule (const Float_t* input, Float_t* output, size_t nSamples, const Float_t* kernel) +{ + // 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 + + // When calling these filter procedures, make sure that ip[-order] and op[-order] point to real data! + + 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; + } +} + +void cMarkAdAudioGainAnalysis::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; + } +} + +int cMarkAdAudioGainAnalysis::ResetSampleFrequency ( long samplefreq ) +{ + // returns a INIT_GAIN_ANALYSIS_OK if successful, INIT_GAIN_ANALYSIS_ERROR if not + 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 96000: + freqindex = 0; + break; + case 88200: + freqindex = 1; + break; + case 64000: + freqindex = 2; + break; + case 48000: + freqindex = 3; + break; + case 44100: + freqindex = 4; + break; + case 32000: + freqindex = 5; + break; + case 24000: + freqindex = 6; + break; + case 22050: + freqindex = 7; + break; + case 16000: + freqindex = 8; + break; + case 12000: + freqindex = 9; + break; + case 11025: + freqindex = 10; + break; + case 8000: + freqindex = 11; + 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 cMarkAdAudioGainAnalysis::Init(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) ); + + gnum_samples=0; + + return INIT_GAIN_ANALYSIS_OK; +} + +static __inline double fsqr(const double d) +{ + return d*d; +} + +int cMarkAdAudioGainAnalysis::AnalyzeSamples ( const Float_t* left_samples, const Float_t* right_samples, size_t num_samples, int num_channels ) +{ + // returns GAIN_ANALYSIS_OK if successful, GAIN_ANALYSIS_ERROR if not + const Float_t* curleft; + const Float_t* curright; + long batchsamples; + long cursamples; + long cursamplepos; + int i; + + if ( num_samples == 0 ) + return GAIN_ANALYSIS_OK; + + gnum_samples+=num_samples; + + cursamplepos = 0; + batchsamples = (long)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; +} + +Float_t cMarkAdAudioGainAnalysis::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); +} + +Float_t cMarkAdAudioGainAnalysis::GetGain ( void ) +{ + return analyzeResult ( A, sizeof(A)/sizeof(*A) ); +} |