| /* |
| * Copyright (c) 1998 - 2009 Conifer Software |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * ReplayGain scanner |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "audio.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| |
| #define HISTOGRAM_SLOTS 12000 |
| #define BUTTER_ORDER 2 |
| #define YULE_ORDER 10 |
| |
| typedef struct ReplayGainFreqInfo { |
| int sample_rate; |
| double BYule[YULE_ORDER + 1]; |
| double AYule[YULE_ORDER + 1]; |
| double BButter[BUTTER_ORDER + 1]; |
| double AButter[BUTTER_ORDER + 1]; |
| } ReplayGainFreqInfo; |
| |
| static const ReplayGainFreqInfo freqinfos[] = |
| { |
| { |
| 192000, |
| { 0.01184742123123, -0.04631092400086, 0.06584226961238, |
| -0.02165588522478, -0.05656260778952, 0.08607493592760, |
| -0.03375544339786, -0.04216579932754, 0.06416711490648, |
| -0.03444708260844, 0.00697275872241 }, |
| { 1.00000000000000, -5.24727318348167, 10.60821585192244, |
| -8.74127665810413, -1.33906071371683, 8.07972882096606, |
| -5.46179918950847, 0.54318070652536, 0.87450969224280, |
| -0.34656083539754, 0.03034796843589 }, |
| { 0.99653501465135, -1.99307002930271, 0.99653501465135 }, |
| { 1.00000000000000, -1.99305802314321, 0.99308203546221 }, |
| }, |
| { |
| 176400, |
| { 0.00268568524529, -0.00852379426080, 0.00852704191347, |
| 0.00146116310295, -0.00950855828762, 0.00625449515499, |
| 0.00116183868722, -0.00362461417136, 0.00203961000134, |
| -0.00050664587933, 0.00004327455427 }, |
| { 1.00000000000000, -5.57512782763045, 12.44291056065794, |
| -12.87462799681221, 3.08554846961576, 6.62493459880692, |
| -7.07662766313248, 2.51175542736441, 0.06731510802735, |
| -0.24567753819213, 0.03961404162376 }, |
| { 0.99622916581118, -1.99245833162236, 0.99622916581118 }, |
| { 1.00000000000000, -1.99244411238133, 0.99247255086339 }, |
| }, |
| { |
| 144000, |
| { 0.00639682359450, -0.02556437970955, 0.04230854400938, |
| -0.03722462201267, 0.01718514827295, 0.00610592243009, |
| -0.03065965747365, 0.04345745003539, -0.03298592681309, |
| 0.01320937236809, -0.00220304127757 }, |
| { 1.00000000000000, -6.14814623523425, 15.80002457141566, |
| -20.78487587686937, 11.98848552310315, 3.36462015062606, |
| -10.22419868359470, 6.65599702146473, -1.67141861110485, |
| -0.05417956536718, 0.07374767867406 }, |
| { 0.99538268958706, -1.99076537917413, 0.99538268958706 }, |
| { 1.00000000000000, -1.99074405950505, 0.99078669884321 }, |
| }, |
| { |
| 128000, |
| { 0.00553120584305, -0.02112620545016, 0.03549076243117, |
| -0.03362498312306, 0.01425867248183, 0.01344686928787, |
| -0.03392770787836, 0.03464136459530, -0.02039116051549, |
| 0.00667420794705, -0.00093763762995 }, |
| { 1.00000000000000, -6.14581710839925, 16.04785903675838, |
| -22.19089131407749, 15.24756471580286, -0.52001440400238, |
| -8.00488641699940, 6.60916094768855, -2.37856022810923, |
| 0.33106947986101, 0.00459820832036 }, |
| { 0.99480702681278, -1.98961405362557, 0.99480702681278 }, |
| { 1.00000000000000, -1.98958708647324, 0.98964102077790 }, |
| }, |
| { |
| 112000, |
| { 0.00528778718259, -0.01893240907245, 0.03185982561867, |
| -0.02926260297838, 0.00715743034072, 0.01985743355827, |
| -0.03222614850941, 0.02565681978192, -0.01210662313473, |
| 0.00325436284541, -0.00044173593001 }, |
| { 1.00000000000000, -6.24932108456288, 17.42344320538476, |
| -27.86819709054896, 26.79087344681326,-13.43711081485123, |
| -0.66023612948173, 6.03658091814935, -4.24926577030310, |
| 1.40829268709186, -0.19480852628112 }, |
| { 0.99406737810867, -1.98813475621734, 0.99406737810867 }, |
| { 1.00000000000000, -1.98809955990514, 0.98816995252954 }, |
| }, |
| { |
| 96000, |
| { 0.00588138296683, -0.01613559730421, 0.02184798954216, |
| -0.01742490405317, 0.00464635643780, 0.01117772513205, |
| -0.02123865824368, 0.01959354413350, -0.01079720643523, |
| 0.00352183686289, -0.00063124341421 }, |
| { 1.00000000000000, -5.97808823642008, 16.21362507964068, |
| -25.72923730652599, 25.40470663139513,-14.66166287771134, |
| 2.81597484359752, 2.51447125969733, -2.23575306985286, |
| 0.75788151036791, -0.10078025199029 }, |
| { 0.99308203517541, -1.98616407035082, 0.99308203517541 }, |
| { 1.00000000000000, -1.98611621154089, 0.98621192916075 }, |
| }, |
| { |
| 88200, |
| { 0.02667482047416, -0.11377479336097, 0.23063167910965, |
| -0.30726477945593, 0.33188520686529, -0.33862680249063, |
| 0.31807161531340, -0.23730796929880, 0.12273894790371, |
| -0.03840017967282, 0.00549673387936 }, |
| { 1.00000000000000, -6.31836451657302, 18.31351310801799, |
| -31.88210014815921, 36.53792146976740,-28.23393036467559, |
| 14.24725258227189, -4.04670980012854, 0.18865757280515, |
| 0.25420333563908, -0.06012333531065 }, |
| { 0.99247255046129, -1.98494510092259, 0.99247255046129 }, |
| { 1.00000000000000, -1.98488843762335, 0.98500176422183 }, |
| }, |
| { |
| 64000, |
| { 0.02613056568174, -0.08128786488109, 0.14937282347325, |
| -0.21695711675126, 0.25010286673402, -0.23162283619278, |
| 0.17424041833052, -0.10299599216680, 0.04258696481981, |
| -0.00977952936493, 0.00105325558889 }, |
| { 1.00000000000000, -5.73625477092119, 16.15249794355035, |
| -29.68654912464508, 39.55706155674083,-39.82524556246253, |
| 30.50605345013009,-17.43051772821245, 7.05154573908017, |
| -1.80783839720514, 0.22127840210813 }, |
| { 0.98964101933472, -1.97928203866944, 0.98964101933472 }, |
| { 1.00000000000000, -1.97917472731009, 0.97938935002880 }, |
| }, |
| { |
| 56000, |
| { 0.03144914734085, -0.06151729206963, 0.08066788708145, |
| -0.09737939921516, 0.08943210803999, -0.06989984672010, |
| 0.04926972841044, -0.03161257848451, 0.01456837493506, |
| -0.00316015108496, 0.00132807215875 }, |
| { 1.00000000000000, -4.87377313090032, 12.03922160140209, |
| -20.10151118381395, 25.10388534415171,-24.29065560815903, |
| 18.27158469090663,-10.45249552560593, 4.30319491872003, |
| -1.13716992070185, 0.14510733527035 }, |
| { 0.98816995007392, -1.97633990014784, 0.98816995007392 }, |
| { 1.00000000000000, -1.97619994516973, 0.97647985512594 }, |
| }, |
| { |
| 48000, |
| { 0.03857599435200, -0.02160367184185, -0.00123395316851, |
| -0.00009291677959, -0.01655260341619, 0.02161526843274, |
| -0.02074045215285, 0.00594298065125, 0.00306428023191, |
| 0.00012025322027, 0.00288463683916 }, |
| { 1.00000000000000, -3.84664617118067, 7.81501653005538, |
| -11.34170355132042, 13.05504219327545,-12.28759895145294, |
| 9.48293806319790, -5.87257861775999, 2.75465861874613, |
| -0.86984376593551, 0.13919314567432 }, |
| { 0.98621192462708, -1.97242384925416, 0.98621192462708 }, |
| { 1.00000000000000, -1.97223372919527, 0.97261396931306 }, |
| }, |
| { |
| 44100, |
| { 0.05418656406430, -0.02911007808948, -0.00848709379851, |
| -0.00851165645469, -0.00834990904936, 0.02245293253339, |
| -0.02596338512915, 0.01624864962975, -0.00240879051584, |
| 0.00674613682247, -0.00187763777362 }, |
| { 1.00000000000000, -3.47845948550071, 6.36317777566148, |
| -8.54751527471874, 9.47693607801280, -8.81498681370155, |
| 6.85401540936998, -4.39470996079559, 2.19611684890774, |
| -0.75104302451432, 0.13149317958808 }, |
| { 0.98500175787242, -1.97000351574484, 0.98500175787242 }, |
| { 1.00000000000000, -1.96977855582618, 0.97022847566350 }, |
| }, |
| { |
| 37800, |
| { 0.08717879977844, -0.01000374016172, -0.06265852122368, |
| -0.01119328800950, -0.00114279372960, 0.02081333954769, |
| -0.01603261863207, 0.01936763028546, 0.00760044736442, |
| -0.00303979112271, -0.00075088605788 }, |
| { 1.00000000000000, -2.62816311472146, 3.53734535817992, |
| -3.81003448678921, 3.91291636730132, -3.53518605896288, |
| 2.71356866157873, -1.86723311846592, 1.12075382367659, |
| -0.48574086886890, 0.11330544663849 }, |
| { 0.98252400815195, -1.96504801630391, 0.98252400815195 }, |
| { 1.00000000000000, -1.96474258269041, 0.96535344991740 }, |
| }, |
| { |
| 32000, |
| { 0.15457299681924, -0.09331049056315, -0.06247880153653, |
| 0.02163541888798, -0.05588393329856, 0.04781476674921, |
| 0.00222312597743, 0.03174092540049, -0.01390589421898, |
| 0.00651420667831, -0.00881362733839 }, |
| { 1.00000000000000, -2.37898834973084, 2.84868151156327, |
| -2.64577170229825, 2.23697657451713, -1.67148153367602, |
| 1.00595954808547, -0.45953458054983, 0.16378164858596, |
| -0.05032077717131, 0.02347897407020 }, |
| { 0.97938932735214, -1.95877865470428, 0.97938932735214 }, |
| { 1.00000000000000, -1.95835380975398, 0.95920349965459 }, |
| }, |
| { |
| 24000, |
| { 0.30296907319327, -0.22613988682123, -0.08587323730772, |
| 0.03282930172664, -0.00915702933434, -0.02364141202522, |
| -0.00584456039913, 0.06276101321749, -0.00000828086748, |
| 0.00205861885564, -0.02950134983287 }, |
| { 1.00000000000000, -1.61273165137247, 1.07977492259970, |
| -0.25656257754070, -0.16276719120440, -0.22638893773906, |
| 0.39120800788284, -0.22138138954925, 0.04500235387352, |
| 0.02005851806501, 0.00302439095741 }, |
| { 0.97531843204928, -1.95063686409857, 0.97531843204928 }, |
| { 1.00000000000000, -1.95002759149878, 0.95124613669835 }, |
| }, |
| { |
| 22050, |
| { 0.33642304856132, -0.25572241425570, -0.11828570177555, |
| 0.11921148675203, -0.07834489609479, -0.00469977914380, |
| -0.00589500224440, 0.05724228140351, 0.00832043980773, |
| -0.01635381384540, -0.01760176568150 }, |
| { 1.00000000000000, -1.49858979367799, 0.87350271418188, |
| 0.12205022308084, -0.80774944671438, 0.47854794562326, |
| -0.12453458140019, -0.04067510197014, 0.08333755284107, |
| -0.04237348025746, 0.02977207319925 }, |
| { 0.97316523498161, -1.94633046996323, 0.97316523498161 }, |
| { 1.00000000000000, -1.94561023566527, 0.94705070426118 }, |
| }, |
| { |
| 18900, |
| { 0.38524531015142, -0.27682212062067, -0.09980181488805, |
| 0.09951486755646, -0.08934020156622, -0.00322369330199, |
| -0.00110329090689, 0.03784509844682, 0.01683906213303, |
| -0.01147039862572, -0.01941767987192 }, |
| { 1.00000000000000, -1.29708918404534, 0.90399339674203, |
| -0.29613799017877, -0.42326645916207, 0.37934887402200, |
| -0.37919795944938, 0.23410283284785, -0.03892971758879, |
| 0.00403009552351, 0.03640166626278 }, |
| { 0.96535326815829, -1.93070653631658, 0.96535326815829 }, |
| { 1.00000000000000, -1.92950577983524, 0.93190729279793 }, |
| }, |
| { |
| 16000, |
| { 0.44915256608450, -0.14351757464547, -0.22784394429749, |
| -0.01419140100551, 0.04078262797139, -0.12398163381748, |
| 0.04097565135648, 0.10478503600251, -0.01863887810927, |
| -0.03193428438915, 0.00541907748707 }, |
| { 1.00000000000000, -0.62820619233671, 0.29661783706366, |
| -0.37256372942400, 0.00213767857124, -0.42029820170918, |
| 0.22199650564824, 0.00613424350682, 0.06747620744683, |
| 0.05784820375801, 0.03222754072173 }, |
| { 0.96454515552826, -1.92909031105652, 0.96454515552826 }, |
| { 1.00000000000000, -1.92783286977036, 0.93034775234268 }, |
| }, |
| { |
| 12000, |
| { 0.56619470757641, -0.75464456939302, 0.16242137742230, |
| 0.16744243493672, -0.18901604199609, 0.30931782841830, |
| -0.27562961986224, 0.00647310677246, 0.08647503780351, |
| -0.03788984554840, -0.00588215443421 }, |
| { 1.00000000000000, -1.04800335126349, 0.29156311971249, |
| -0.26806001042947, 0.00819999645858, 0.45054734505008, |
| -0.33032403314006, 0.06739368333110, -0.04784254229033, |
| 0.01639907836189, 0.01807364323573 }, |
| { 0.96009142950541, -1.92018285901082, 0.96009142950541 }, |
| { 1.00000000000000, -1.91858953033784, 0.92177618768381 }, |
| }, |
| { |
| 11025, |
| { 0.58100494960553, -0.53174909058578, -0.14289799034253, |
| 0.17520704835522, 0.02377945217615, 0.15558449135573, |
| -0.25344790059353, 0.01628462406333, 0.06920467763959, |
| -0.03721611395801, -0.00749618797172 }, |
| { 1.00000000000000, -0.51035327095184, -0.31863563325245, |
| -0.20256413484477, 0.14728154134330, 0.38952639978999, |
| -0.23313271880868, -0.05246019024463, -0.02505961724053, |
| 0.02442357316099, 0.01818801111503 }, |
| { 0.95856916599601, -1.91713833199203, 0.95856916599601 }, |
| { 1.00000000000000, -1.91542108074780, 0.91885558323625 }, |
| }, |
| { |
| 8000, |
| { 0.53648789255105, -0.42163034350696, -0.00275953611929, |
| 0.04267842219415, -0.10214864179676, 0.14590772289388, |
| -0.02459864859345, -0.11202315195388, -0.04060034127000, |
| 0.04788665548180, -0.02217936801134 }, |
| { 1.00000000000000, -0.25049871956020, -0.43193942311114, |
| -0.03424681017675, -0.04678328784242, 0.26408300200955, |
| 0.15113130533216, -0.17556493366449, -0.18823009262115, |
| 0.05477720428674, 0.04704409688120 }, |
| { 0.94597685600279, -1.89195371200558, 0.94597685600279 }, |
| { 1.00000000000000, -1.88903307939452, 0.89487434461664 }, |
| }, |
| }; |
| |
| typedef struct ReplayGainContext { |
| uint32_t histogram[HISTOGRAM_SLOTS]; |
| float peak; |
| int yule_hist_i, butter_hist_i; |
| const double *yule_coeff_a; |
| const double *yule_coeff_b; |
| const double *butter_coeff_a; |
| const double *butter_coeff_b; |
| float yule_hist_a[256]; |
| float yule_hist_b[256]; |
| float butter_hist_a[256]; |
| float butter_hist_b[256]; |
| } ReplayGainContext; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layout = NULL; |
| int i, ret; |
| |
| if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 || |
| (ret = ff_set_common_formats (ctx , formats )) < 0 || |
| (ret = ff_add_channel_layout (&layout , AV_CH_LAYOUT_STEREO)) < 0 || |
| (ret = ff_set_common_channel_layouts (ctx , layout )) < 0) |
| return ret; |
| |
| formats = NULL; |
| for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) { |
| if ((ret = ff_add_format(&formats, freqinfos[i].sample_rate)) < 0) |
| return ret; |
| } |
| |
| return ff_set_common_samplerates(ctx, formats); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ReplayGainContext *s = ctx->priv; |
| int i; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) { |
| if (freqinfos[i].sample_rate == inlink->sample_rate) |
| break; |
| } |
| av_assert0(i < FF_ARRAY_ELEMS(freqinfos)); |
| |
| s->yule_coeff_a = freqinfos[i].AYule; |
| s->yule_coeff_b = freqinfos[i].BYule; |
| s->butter_coeff_a = freqinfos[i].AButter; |
| s->butter_coeff_b = freqinfos[i].BButter; |
| |
| s->yule_hist_i = 20; |
| s->butter_hist_i = 4; |
| inlink->partial_buf_size = |
| inlink->min_samples = |
| inlink->max_samples = inlink->sample_rate / 20; |
| |
| return 0; |
| } |
| |
| /* |
| * Update largest absolute sample value. |
| */ |
| static void calc_stereo_peak(const float *samples, int nb_samples, |
| float *peak_p) |
| { |
| float peak = 0.0; |
| |
| while (nb_samples--) { |
| if (samples[0] > peak) |
| peak = samples[0]; |
| else if (-samples[0] > peak) |
| peak = -samples[0]; |
| |
| if (samples[1] > peak) |
| peak = samples[1]; |
| else if (-samples[1] > peak) |
| peak = -samples[1]; |
| |
| samples += 2; |
| } |
| |
| *peak_p = FFMAX(peak, *peak_p); |
| } |
| |
| /* |
| * Calculate stereo RMS level. Minimum value is about -100 dB for |
| * digital silence. The 90 dB offset is to compensate for the |
| * normalized float range and 3 dB is for stereo samples. |
| */ |
| static double calc_stereo_rms(const float *samples, int nb_samples) |
| { |
| int count = nb_samples; |
| double sum = 1e-16; |
| |
| while (count--) { |
| sum += samples[0] * samples[0] + samples[1] * samples[1]; |
| samples += 2; |
| } |
| |
| return 10 * log10 (sum / nb_samples) + 90.0 - 3.0; |
| } |
| |
| /* |
| * Optimized implementation of 2nd-order IIR stereo filter. |
| */ |
| static void butter_filter_stereo_samples(ReplayGainContext *s, |
| float *samples, int nb_samples) |
| { |
| const double *coeff_a = s->butter_coeff_a; |
| const double *coeff_b = s->butter_coeff_b; |
| float *hist_a = s->butter_hist_a; |
| float *hist_b = s->butter_hist_b; |
| double left, right; |
| int i, j; |
| |
| i = s->butter_hist_i; |
| |
| // If filter history is very small magnitude, clear it completely |
| // to prevent denormals from rattling around in there forever |
| // (slowing us down). |
| |
| for (j = -4; j < 0; ++j) |
| if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10) |
| break; |
| |
| if (!j) { |
| memset(s->butter_hist_a, 0, sizeof(s->butter_hist_a)); |
| memset(s->butter_hist_b, 0, sizeof(s->butter_hist_b)); |
| } |
| |
| while (nb_samples--) { |
| left = (hist_b[i ] = samples[0]) * coeff_b[0]; |
| right = (hist_b[i + 1] = samples[1]) * coeff_b[0]; |
| left += hist_b[i - 2] * coeff_b[1] - hist_a[i - 2] * coeff_a[1]; |
| right += hist_b[i - 1] * coeff_b[1] - hist_a[i - 1] * coeff_a[1]; |
| left += hist_b[i - 4] * coeff_b[2] - hist_a[i - 4] * coeff_a[2]; |
| right += hist_b[i - 3] * coeff_b[2] - hist_a[i - 3] * coeff_a[2]; |
| samples[0] = hist_a[i ] = (float) left; |
| samples[1] = hist_a[i + 1] = (float) right; |
| samples += 2; |
| |
| if ((i += 2) == 256) { |
| memcpy(hist_a, hist_a + 252, sizeof(*hist_a) * 4); |
| memcpy(hist_b, hist_b + 252, sizeof(*hist_b) * 4); |
| i = 4; |
| } |
| } |
| |
| s->butter_hist_i = i; |
| } |
| |
| /* |
| * Optimized implementation of 10th-order IIR stereo filter. |
| */ |
| static void yule_filter_stereo_samples(ReplayGainContext *s, const float *src, |
| float *dst, int nb_samples) |
| { |
| const double *coeff_a = s->yule_coeff_a; |
| const double *coeff_b = s->yule_coeff_b; |
| float *hist_a = s->yule_hist_a; |
| float *hist_b = s->yule_hist_b; |
| double left, right; |
| int i, j; |
| |
| i = s->yule_hist_i; |
| |
| // If filter history is very small magnitude, clear it completely to |
| // prevent denormals from rattling around in there forever |
| // (slowing us down). |
| |
| for (j = -20; j < 0; ++j) |
| if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10) |
| break; |
| |
| if (!j) { |
| memset(s->yule_hist_a, 0, sizeof(s->yule_hist_a)); |
| memset(s->yule_hist_b, 0, sizeof(s->yule_hist_b)); |
| } |
| |
| while (nb_samples--) { |
| left = (hist_b[i] = src[0]) * coeff_b[0]; |
| right = (hist_b[i + 1] = src[1]) * coeff_b[0]; |
| left += hist_b[i - 2] * coeff_b[ 1] - hist_a[i - 2] * coeff_a[1 ]; |
| right += hist_b[i - 1] * coeff_b[ 1] - hist_a[i - 1] * coeff_a[1 ]; |
| left += hist_b[i - 4] * coeff_b[ 2] - hist_a[i - 4] * coeff_a[2 ]; |
| right += hist_b[i - 3] * coeff_b[ 2] - hist_a[i - 3] * coeff_a[2 ]; |
| left += hist_b[i - 6] * coeff_b[ 3] - hist_a[i - 6] * coeff_a[3 ]; |
| right += hist_b[i - 5] * coeff_b[ 3] - hist_a[i - 5] * coeff_a[3 ]; |
| left += hist_b[i - 8] * coeff_b[ 4] - hist_a[i - 8] * coeff_a[4 ]; |
| right += hist_b[i - 7] * coeff_b[ 4] - hist_a[i - 7] * coeff_a[4 ]; |
| left += hist_b[i - 10] * coeff_b[ 5] - hist_a[i - 10] * coeff_a[5 ]; |
| right += hist_b[i - 9] * coeff_b[ 5] - hist_a[i - 9] * coeff_a[5 ]; |
| left += hist_b[i - 12] * coeff_b[ 6] - hist_a[i - 12] * coeff_a[6 ]; |
| right += hist_b[i - 11] * coeff_b[ 6] - hist_a[i - 11] * coeff_a[6 ]; |
| left += hist_b[i - 14] * coeff_b[ 7] - hist_a[i - 14] * coeff_a[7 ]; |
| right += hist_b[i - 13] * coeff_b[ 7] - hist_a[i - 13] * coeff_a[7 ]; |
| left += hist_b[i - 16] * coeff_b[ 8] - hist_a[i - 16] * coeff_a[8 ]; |
| right += hist_b[i - 15] * coeff_b[ 8] - hist_a[i - 15] * coeff_a[8 ]; |
| left += hist_b[i - 18] * coeff_b[ 9] - hist_a[i - 18] * coeff_a[9 ]; |
| right += hist_b[i - 17] * coeff_b[ 9] - hist_a[i - 17] * coeff_a[9 ]; |
| left += hist_b[i - 20] * coeff_b[10] - hist_a[i - 20] * coeff_a[10]; |
| right += hist_b[i - 19] * coeff_b[10] - hist_a[i - 19] * coeff_a[10]; |
| dst[0] = hist_a[i ] = (float)left; |
| dst[1] = hist_a[i + 1] = (float)right; |
| src += 2; |
| dst += 2; |
| |
| if ((i += 2) == 256) { |
| memcpy(hist_a, hist_a + 236, sizeof(*hist_a) * 20); |
| memcpy(hist_b, hist_b + 236, sizeof(*hist_b) * 20); |
| i = 20; |
| } |
| } |
| |
| s->yule_hist_i = i; |
| } |
| |
| /* |
| * Calculate the ReplayGain value from the specified loudness histogram; |
| * clip to -24 / +64 dB. |
| */ |
| static float calc_replaygain(uint32_t *histogram) |
| { |
| uint32_t loud_count = 0, total_windows = 0; |
| float gain; |
| int i; |
| |
| for (i = 0; i < HISTOGRAM_SLOTS; i++) |
| total_windows += histogram [i]; |
| |
| while (i--) |
| if ((loud_count += histogram [i]) * 20 >= total_windows) |
| break; |
| |
| gain = (float)(64.54 - i / 100.0); |
| |
| return av_clipf(gain, -24.0, 64.0); |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ReplayGainContext *s = ctx->priv; |
| uint32_t level; |
| AVFrame *out; |
| |
| out = ff_get_audio_buffer(inlink, in->nb_samples); |
| if (!out) { |
| av_frame_free(&in); |
| return AVERROR(ENOMEM); |
| } |
| |
| calc_stereo_peak((float *)in->data[0], |
| in->nb_samples, &s->peak); |
| yule_filter_stereo_samples(s, (const float *)in->data[0], |
| (float *)out->data[0], |
| out->nb_samples); |
| butter_filter_stereo_samples(s, (float *)out->data[0], |
| out->nb_samples); |
| level = (uint32_t)floor(100 * calc_stereo_rms((float *)out->data[0], |
| out->nb_samples)); |
| level = av_clip(level, 0, HISTOGRAM_SLOTS - 1); |
| |
| s->histogram[level]++; |
| |
| av_frame_free(&out); |
| return ff_filter_frame(outlink, in); |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ReplayGainContext *s = ctx->priv; |
| float gain = calc_replaygain(s->histogram); |
| |
| av_log(ctx, AV_LOG_INFO, "track_gain = %+.2f dB\n", gain); |
| av_log(ctx, AV_LOG_INFO, "track_peak = %.6f\n", s->peak); |
| } |
| |
| static const AVFilterPad replaygain_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| .config_props = config_input, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad replaygain_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_af_replaygain = { |
| .name = "replaygain", |
| .description = NULL_IF_CONFIG_SMALL("ReplayGain scanner."), |
| .query_formats = query_formats, |
| .uninit = uninit, |
| .priv_size = sizeof(ReplayGainContext), |
| .inputs = replaygain_inputs, |
| .outputs = replaygain_outputs, |
| }; |
