2 * Copyright (c) 1998 - 2009 Conifer Software
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/avassert.h"
27 #include "libavutil/channel_layout.h"
32 #define HISTOGRAM_SLOTS 12000
33 #define BUTTER_ORDER 2
36 typedef struct ReplayGainFreqInfo
{
38 double BYule
[YULE_ORDER
+ 1];
39 double AYule
[YULE_ORDER
+ 1];
40 double BButter
[BUTTER_ORDER
+ 1];
41 double AButter
[BUTTER_ORDER
+ 1];
44 static const ReplayGainFreqInfo freqinfos
[] =
48 { 0.01184742123123, -0.04631092400086, 0.06584226961238,
49 -0.02165588522478, -0.05656260778952, 0.08607493592760,
50 -0.03375544339786, -0.04216579932754, 0.06416711490648,
51 -0.03444708260844, 0.00697275872241 },
52 { 1.00000000000000, -5.24727318348167, 10.60821585192244,
53 -8.74127665810413, -1.33906071371683, 8.07972882096606,
54 -5.46179918950847, 0.54318070652536, 0.87450969224280,
55 -0.34656083539754, 0.03034796843589 },
56 { 0.99653501465135, -1.99307002930271, 0.99653501465135 },
57 { 1.00000000000000, -1.99305802314321, 0.99308203546221 },
61 { 0.00268568524529, -0.00852379426080, 0.00852704191347,
62 0.00146116310295, -0.00950855828762, 0.00625449515499,
63 0.00116183868722, -0.00362461417136, 0.00203961000134,
64 -0.00050664587933, 0.00004327455427 },
65 { 1.00000000000000, -5.57512782763045, 12.44291056065794,
66 -12.87462799681221, 3.08554846961576, 6.62493459880692,
67 -7.07662766313248, 2.51175542736441, 0.06731510802735,
68 -0.24567753819213, 0.03961404162376 },
69 { 0.99622916581118, -1.99245833162236, 0.99622916581118 },
70 { 1.00000000000000, -1.99244411238133, 0.99247255086339 },
74 { 0.00639682359450, -0.02556437970955, 0.04230854400938,
75 -0.03722462201267, 0.01718514827295, 0.00610592243009,
76 -0.03065965747365, 0.04345745003539, -0.03298592681309,
77 0.01320937236809, -0.00220304127757 },
78 { 1.00000000000000, -6.14814623523425, 15.80002457141566,
79 -20.78487587686937, 11.98848552310315, 3.36462015062606,
80 -10.22419868359470, 6.65599702146473, -1.67141861110485,
81 -0.05417956536718, 0.07374767867406 },
82 { 0.99538268958706, -1.99076537917413, 0.99538268958706 },
83 { 1.00000000000000, -1.99074405950505, 0.99078669884321 },
87 { 0.00553120584305, -0.02112620545016, 0.03549076243117,
88 -0.03362498312306, 0.01425867248183, 0.01344686928787,
89 -0.03392770787836, 0.03464136459530, -0.02039116051549,
90 0.00667420794705, -0.00093763762995 },
91 { 1.00000000000000, -6.14581710839925, 16.04785903675838,
92 -22.19089131407749, 15.24756471580286, -0.52001440400238,
93 -8.00488641699940, 6.60916094768855, -2.37856022810923,
94 0.33106947986101, 0.00459820832036 },
95 { 0.99480702681278, -1.98961405362557, 0.99480702681278 },
96 { 1.00000000000000, -1.98958708647324, 0.98964102077790 },
100 { 0.00528778718259, -0.01893240907245, 0.03185982561867,
101 -0.02926260297838, 0.00715743034072, 0.01985743355827,
102 -0.03222614850941, 0.02565681978192, -0.01210662313473,
103 0.00325436284541, -0.00044173593001 },
104 { 1.00000000000000, -6.24932108456288, 17.42344320538476,
105 -27.86819709054896, 26.79087344681326,-13.43711081485123,
106 -0.66023612948173, 6.03658091814935, -4.24926577030310,
107 1.40829268709186, -0.19480852628112 },
108 { 0.99406737810867, -1.98813475621734, 0.99406737810867 },
109 { 1.00000000000000, -1.98809955990514, 0.98816995252954 },
113 { 0.00588138296683, -0.01613559730421, 0.02184798954216,
114 -0.01742490405317, 0.00464635643780, 0.01117772513205,
115 -0.02123865824368, 0.01959354413350, -0.01079720643523,
116 0.00352183686289, -0.00063124341421 },
117 { 1.00000000000000, -5.97808823642008, 16.21362507964068,
118 -25.72923730652599, 25.40470663139513,-14.66166287771134,
119 2.81597484359752, 2.51447125969733, -2.23575306985286,
120 0.75788151036791, -0.10078025199029 },
121 { 0.99308203517541, -1.98616407035082, 0.99308203517541 },
122 { 1.00000000000000, -1.98611621154089, 0.98621192916075 },
126 { 0.02667482047416, -0.11377479336097, 0.23063167910965,
127 -0.30726477945593, 0.33188520686529, -0.33862680249063,
128 0.31807161531340, -0.23730796929880, 0.12273894790371,
129 -0.03840017967282, 0.00549673387936 },
130 { 1.00000000000000, -6.31836451657302, 18.31351310801799,
131 -31.88210014815921, 36.53792146976740,-28.23393036467559,
132 14.24725258227189, -4.04670980012854, 0.18865757280515,
133 0.25420333563908, -0.06012333531065 },
134 { 0.99247255046129, -1.98494510092259, 0.99247255046129 },
135 { 1.00000000000000, -1.98488843762335, 0.98500176422183 },
139 { 0.02613056568174, -0.08128786488109, 0.14937282347325,
140 -0.21695711675126, 0.25010286673402, -0.23162283619278,
141 0.17424041833052, -0.10299599216680, 0.04258696481981,
142 -0.00977952936493, 0.00105325558889 },
143 { 1.00000000000000, -5.73625477092119, 16.15249794355035,
144 -29.68654912464508, 39.55706155674083,-39.82524556246253,
145 30.50605345013009,-17.43051772821245, 7.05154573908017,
146 -1.80783839720514, 0.22127840210813 },
147 { 0.98964101933472, -1.97928203866944, 0.98964101933472 },
148 { 1.00000000000000, -1.97917472731009, 0.97938935002880 },
152 { 0.03144914734085, -0.06151729206963, 0.08066788708145,
153 -0.09737939921516, 0.08943210803999, -0.06989984672010,
154 0.04926972841044, -0.03161257848451, 0.01456837493506,
155 -0.00316015108496, 0.00132807215875 },
156 { 1.00000000000000, -4.87377313090032, 12.03922160140209,
157 -20.10151118381395, 25.10388534415171,-24.29065560815903,
158 18.27158469090663,-10.45249552560593, 4.30319491872003,
159 -1.13716992070185, 0.14510733527035 },
160 { 0.98816995007392, -1.97633990014784, 0.98816995007392 },
161 { 1.00000000000000, -1.97619994516973, 0.97647985512594 },
165 { 0.03857599435200, -0.02160367184185, -0.00123395316851,
166 -0.00009291677959, -0.01655260341619, 0.02161526843274,
167 -0.02074045215285, 0.00594298065125, 0.00306428023191,
168 0.00012025322027, 0.00288463683916 },
169 { 1.00000000000000, -3.84664617118067, 7.81501653005538,
170 -11.34170355132042, 13.05504219327545,-12.28759895145294,
171 9.48293806319790, -5.87257861775999, 2.75465861874613,
172 -0.86984376593551, 0.13919314567432 },
173 { 0.98621192462708, -1.97242384925416, 0.98621192462708 },
174 { 1.00000000000000, -1.97223372919527, 0.97261396931306 },
178 { 0.05418656406430, -0.02911007808948, -0.00848709379851,
179 -0.00851165645469, -0.00834990904936, 0.02245293253339,
180 -0.02596338512915, 0.01624864962975, -0.00240879051584,
181 0.00674613682247, -0.00187763777362 },
182 { 1.00000000000000, -3.47845948550071, 6.36317777566148,
183 -8.54751527471874, 9.47693607801280, -8.81498681370155,
184 6.85401540936998, -4.39470996079559, 2.19611684890774,
185 -0.75104302451432, 0.13149317958808 },
186 { 0.98500175787242, -1.97000351574484, 0.98500175787242 },
187 { 1.00000000000000, -1.96977855582618, 0.97022847566350 },
191 { 0.08717879977844, -0.01000374016172, -0.06265852122368,
192 -0.01119328800950, -0.00114279372960, 0.02081333954769,
193 -0.01603261863207, 0.01936763028546, 0.00760044736442,
194 -0.00303979112271, -0.00075088605788 },
195 { 1.00000000000000, -2.62816311472146, 3.53734535817992,
196 -3.81003448678921, 3.91291636730132, -3.53518605896288,
197 2.71356866157873, -1.86723311846592, 1.12075382367659,
198 -0.48574086886890, 0.11330544663849 },
199 { 0.98252400815195, -1.96504801630391, 0.98252400815195 },
200 { 1.00000000000000, -1.96474258269041, 0.96535344991740 },
204 { 0.15457299681924, -0.09331049056315, -0.06247880153653,
205 0.02163541888798, -0.05588393329856, 0.04781476674921,
206 0.00222312597743, 0.03174092540049, -0.01390589421898,
207 0.00651420667831, -0.00881362733839 },
208 { 1.00000000000000, -2.37898834973084, 2.84868151156327,
209 -2.64577170229825, 2.23697657451713, -1.67148153367602,
210 1.00595954808547, -0.45953458054983, 0.16378164858596,
211 -0.05032077717131, 0.02347897407020 },
212 { 0.97938932735214, -1.95877865470428, 0.97938932735214 },
213 { 1.00000000000000, -1.95835380975398, 0.95920349965459 },
217 { 0.30296907319327, -0.22613988682123, -0.08587323730772,
218 0.03282930172664, -0.00915702933434, -0.02364141202522,
219 -0.00584456039913, 0.06276101321749, -0.00000828086748,
220 0.00205861885564, -0.02950134983287 },
221 { 1.00000000000000, -1.61273165137247, 1.07977492259970,
222 -0.25656257754070, -0.16276719120440, -0.22638893773906,
223 0.39120800788284, -0.22138138954925, 0.04500235387352,
224 0.02005851806501, 0.00302439095741 },
225 { 0.97531843204928, -1.95063686409857, 0.97531843204928 },
226 { 1.00000000000000, -1.95002759149878, 0.95124613669835 },
230 { 0.33642304856132, -0.25572241425570, -0.11828570177555,
231 0.11921148675203, -0.07834489609479, -0.00469977914380,
232 -0.00589500224440, 0.05724228140351, 0.00832043980773,
233 -0.01635381384540, -0.01760176568150 },
234 { 1.00000000000000, -1.49858979367799, 0.87350271418188,
235 0.12205022308084, -0.80774944671438, 0.47854794562326,
236 -0.12453458140019, -0.04067510197014, 0.08333755284107,
237 -0.04237348025746, 0.02977207319925 },
238 { 0.97316523498161, -1.94633046996323, 0.97316523498161 },
239 { 1.00000000000000, -1.94561023566527, 0.94705070426118 },
243 { 0.38524531015142, -0.27682212062067, -0.09980181488805,
244 0.09951486755646, -0.08934020156622, -0.00322369330199,
245 -0.00110329090689, 0.03784509844682, 0.01683906213303,
246 -0.01147039862572, -0.01941767987192 },
247 { 1.00000000000000, -1.29708918404534, 0.90399339674203,
248 -0.29613799017877, -0.42326645916207, 0.37934887402200,
249 -0.37919795944938, 0.23410283284785, -0.03892971758879,
250 0.00403009552351, 0.03640166626278 },
251 { 0.96535326815829, -1.93070653631658, 0.96535326815829 },
252 { 1.00000000000000, -1.92950577983524, 0.93190729279793 },
256 { 0.44915256608450, -0.14351757464547, -0.22784394429749,
257 -0.01419140100551, 0.04078262797139, -0.12398163381748,
258 0.04097565135648, 0.10478503600251, -0.01863887810927,
259 -0.03193428438915, 0.00541907748707 },
260 { 1.00000000000000, -0.62820619233671, 0.29661783706366,
261 -0.37256372942400, 0.00213767857124, -0.42029820170918,
262 0.22199650564824, 0.00613424350682, 0.06747620744683,
263 0.05784820375801, 0.03222754072173 },
264 { 0.96454515552826, -1.92909031105652, 0.96454515552826 },
265 { 1.00000000000000, -1.92783286977036, 0.93034775234268 },
269 { 0.56619470757641, -0.75464456939302, 0.16242137742230,
270 0.16744243493672, -0.18901604199609, 0.30931782841830,
271 -0.27562961986224, 0.00647310677246, 0.08647503780351,
272 -0.03788984554840, -0.00588215443421 },
273 { 1.00000000000000, -1.04800335126349, 0.29156311971249,
274 -0.26806001042947, 0.00819999645858, 0.45054734505008,
275 -0.33032403314006, 0.06739368333110, -0.04784254229033,
276 0.01639907836189, 0.01807364323573 },
277 { 0.96009142950541, -1.92018285901082, 0.96009142950541 },
278 { 1.00000000000000, -1.91858953033784, 0.92177618768381 },
282 { 0.58100494960553, -0.53174909058578, -0.14289799034253,
283 0.17520704835522, 0.02377945217615, 0.15558449135573,
284 -0.25344790059353, 0.01628462406333, 0.06920467763959,
285 -0.03721611395801, -0.00749618797172 },
286 { 1.00000000000000, -0.51035327095184, -0.31863563325245,
287 -0.20256413484477, 0.14728154134330, 0.38952639978999,
288 -0.23313271880868, -0.05246019024463, -0.02505961724053,
289 0.02442357316099, 0.01818801111503 },
290 { 0.95856916599601, -1.91713833199203, 0.95856916599601 },
291 { 1.00000000000000, -1.91542108074780, 0.91885558323625 },
295 { 0.53648789255105, -0.42163034350696, -0.00275953611929,
296 0.04267842219415, -0.10214864179676, 0.14590772289388,
297 -0.02459864859345, -0.11202315195388, -0.04060034127000,
298 0.04788665548180, -0.02217936801134 },
299 { 1.00000000000000, -0.25049871956020, -0.43193942311114,
300 -0.03424681017675, -0.04678328784242, 0.26408300200955,
301 0.15113130533216, -0.17556493366449, -0.18823009262115,
302 0.05477720428674, 0.04704409688120 },
303 { 0.94597685600279, -1.89195371200558, 0.94597685600279 },
304 { 1.00000000000000, -1.88903307939452, 0.89487434461664 },
308 typedef struct ReplayGainContext
{
309 uint32_t histogram
[HISTOGRAM_SLOTS
];
311 int yule_hist_i
, butter_hist_i
;
312 const double *yule_coeff_a
;
313 const double *yule_coeff_b
;
314 const double *butter_coeff_a
;
315 const double *butter_coeff_b
;
316 float yule_hist_a
[256];
317 float yule_hist_b
[256];
318 float butter_hist_a
[256];
319 float butter_hist_b
[256];
322 static int query_formats(AVFilterContext
*ctx
)
324 AVFilterFormats
*formats
= NULL
;
325 AVFilterChannelLayouts
*layout
= NULL
;
328 ff_add_format(&formats
, AV_SAMPLE_FMT_FLT
);
329 ff_set_common_formats(ctx
, formats
);
330 ff_add_channel_layout(&layout
, AV_CH_LAYOUT_STEREO
);
331 ff_set_common_channel_layouts(ctx
, layout
);
334 for (i
= 0; i
< FF_ARRAY_ELEMS(freqinfos
); i
++)
335 ff_add_format(&formats
, freqinfos
[i
].sample_rate
);
336 ff_set_common_samplerates(ctx
, formats
);
341 static int config_input(AVFilterLink
*inlink
)
343 AVFilterContext
*ctx
= inlink
->dst
;
344 ReplayGainContext
*s
= ctx
->priv
;
347 for (i
= 0; i
< FF_ARRAY_ELEMS(freqinfos
); i
++) {
348 if (freqinfos
[i
].sample_rate
== inlink
->sample_rate
)
351 av_assert0(i
< FF_ARRAY_ELEMS(freqinfos
));
353 s
->yule_coeff_a
= freqinfos
[i
].AYule
;
354 s
->yule_coeff_b
= freqinfos
[i
].BYule
;
355 s
->butter_coeff_a
= freqinfos
[i
].AButter
;
356 s
->butter_coeff_b
= freqinfos
[i
].BButter
;
359 s
->butter_hist_i
= 4;
360 inlink
->partial_buf_size
=
361 inlink
->min_samples
=
362 inlink
->max_samples
= inlink
->sample_rate
/ 20;
368 * Update largest absolute sample value.
370 static void calc_stereo_peak(const float *samples
, int nb_samples
,
375 while (nb_samples
--) {
376 if (samples
[0] > peak
)
378 else if (-samples
[0] > peak
)
381 if (samples
[1] > peak
)
383 else if (-samples
[1] > peak
)
389 *peak_p
= FFMAX(peak
, *peak_p
);
393 * Calculate stereo RMS level. Minimum value is about -100 dB for
394 * digital silence. The 90 dB offset is to compensate for the
395 * normalized float range and 3 dB is for stereo samples.
397 static double calc_stereo_rms(const float *samples
, int nb_samples
)
399 int count
= nb_samples
;
403 sum
+= samples
[0] * samples
[0] + samples
[1] * samples
[1];
407 return 10 * log10 (sum
/ nb_samples
) + 90.0 - 3.0;
411 * Optimized implementation of 2nd-order IIR stereo filter.
413 static void butter_filter_stereo_samples(ReplayGainContext
*s
,
414 float *samples
, int nb_samples
)
416 const double *coeff_a
= s
->butter_coeff_a
;
417 const double *coeff_b
= s
->butter_coeff_b
;
418 float *hist_a
= s
->butter_hist_a
;
419 float *hist_b
= s
->butter_hist_b
;
423 i
= s
->butter_hist_i
;
425 // If filter history is very small magnitude, clear it completely
426 // to prevent denormals from rattling around in there forever
427 // (slowing us down).
429 for (j
= -4; j
< 0; ++j
)
430 if (fabs(hist_a
[i
+ j
]) > 1e-10 || fabs(hist_b
[i
+ j
]) > 1e-10)
434 memset(s
->butter_hist_a
, 0, sizeof(s
->butter_hist_a
));
435 memset(s
->butter_hist_b
, 0, sizeof(s
->butter_hist_b
));
438 while (nb_samples
--) {
439 left
= (hist_b
[i
] = samples
[0]) * coeff_b
[0];
440 right
= (hist_b
[i
+ 1] = samples
[1]) * coeff_b
[0];
441 left
+= hist_b
[i
- 2] * coeff_b
[1] - hist_a
[i
- 2] * coeff_a
[1];
442 right
+= hist_b
[i
- 1] * coeff_b
[1] - hist_a
[i
- 1] * coeff_a
[1];
443 left
+= hist_b
[i
- 4] * coeff_b
[2] - hist_a
[i
- 4] * coeff_a
[2];
444 right
+= hist_b
[i
- 3] * coeff_b
[2] - hist_a
[i
- 3] * coeff_a
[2];
445 samples
[0] = hist_a
[i
] = (float) left
;
446 samples
[1] = hist_a
[i
+ 1] = (float) right
;
449 if ((i
+= 2) == 256) {
450 memcpy(hist_a
, hist_a
+ 252, sizeof(*hist_a
) * 4);
451 memcpy(hist_b
, hist_b
+ 252, sizeof(*hist_b
) * 4);
456 s
->butter_hist_i
= i
;
460 * Optimized implementation of 10th-order IIR stereo filter.
462 static void yule_filter_stereo_samples(ReplayGainContext
*s
, const float *src
,
463 float *dst
, int nb_samples
)
465 const double *coeff_a
= s
->yule_coeff_a
;
466 const double *coeff_b
= s
->yule_coeff_b
;
467 float *hist_a
= s
->yule_hist_a
;
468 float *hist_b
= s
->yule_hist_b
;
474 // If filter history is very small magnitude, clear it completely to
475 // prevent denormals from rattling around in there forever
476 // (slowing us down).
478 for (j
= -20; j
< 0; ++j
)
479 if (fabs(hist_a
[i
+ j
]) > 1e-10 || fabs(hist_b
[i
+ j
]) > 1e-10)
483 memset(s
->yule_hist_a
, 0, sizeof(s
->yule_hist_a
));
484 memset(s
->yule_hist_b
, 0, sizeof(s
->yule_hist_b
));
487 while (nb_samples
--) {
488 left
= (hist_b
[i
] = src
[0]) * coeff_b
[0];
489 right
= (hist_b
[i
+ 1] = src
[1]) * coeff_b
[0];
490 left
+= hist_b
[i
- 2] * coeff_b
[ 1] - hist_a
[i
- 2] * coeff_a
[1 ];
491 right
+= hist_b
[i
- 1] * coeff_b
[ 1] - hist_a
[i
- 1] * coeff_a
[1 ];
492 left
+= hist_b
[i
- 4] * coeff_b
[ 2] - hist_a
[i
- 4] * coeff_a
[2 ];
493 right
+= hist_b
[i
- 3] * coeff_b
[ 2] - hist_a
[i
- 3] * coeff_a
[2 ];
494 left
+= hist_b
[i
- 6] * coeff_b
[ 3] - hist_a
[i
- 6] * coeff_a
[3 ];
495 right
+= hist_b
[i
- 5] * coeff_b
[ 3] - hist_a
[i
- 5] * coeff_a
[3 ];
496 left
+= hist_b
[i
- 8] * coeff_b
[ 4] - hist_a
[i
- 8] * coeff_a
[4 ];
497 right
+= hist_b
[i
- 7] * coeff_b
[ 4] - hist_a
[i
- 7] * coeff_a
[4 ];
498 left
+= hist_b
[i
- 10] * coeff_b
[ 5] - hist_a
[i
- 10] * coeff_a
[5 ];
499 right
+= hist_b
[i
- 9] * coeff_b
[ 5] - hist_a
[i
- 9] * coeff_a
[5 ];
500 left
+= hist_b
[i
- 12] * coeff_b
[ 6] - hist_a
[i
- 12] * coeff_a
[6 ];
501 right
+= hist_b
[i
- 11] * coeff_b
[ 6] - hist_a
[i
- 11] * coeff_a
[6 ];
502 left
+= hist_b
[i
- 14] * coeff_b
[ 7] - hist_a
[i
- 14] * coeff_a
[7 ];
503 right
+= hist_b
[i
- 13] * coeff_b
[ 7] - hist_a
[i
- 13] * coeff_a
[7 ];
504 left
+= hist_b
[i
- 16] * coeff_b
[ 8] - hist_a
[i
- 16] * coeff_a
[8 ];
505 right
+= hist_b
[i
- 15] * coeff_b
[ 8] - hist_a
[i
- 15] * coeff_a
[8 ];
506 left
+= hist_b
[i
- 18] * coeff_b
[ 9] - hist_a
[i
- 18] * coeff_a
[9 ];
507 right
+= hist_b
[i
- 17] * coeff_b
[ 9] - hist_a
[i
- 17] * coeff_a
[9 ];
508 left
+= hist_b
[i
- 20] * coeff_b
[10] - hist_a
[i
- 20] * coeff_a
[10];
509 right
+= hist_b
[i
- 19] * coeff_b
[10] - hist_a
[i
- 19] * coeff_a
[10];
510 dst
[0] = hist_a
[i
] = (float)left
;
511 dst
[1] = hist_a
[i
+ 1] = (float)right
;
515 if ((i
+= 2) == 256) {
516 memcpy(hist_a
, hist_a
+ 236, sizeof(*hist_a
) * 20);
517 memcpy(hist_b
, hist_b
+ 236, sizeof(*hist_b
) * 20);
526 * Calculate the ReplayGain value from the specified loudness histogram;
527 * clip to -24 / +64 dB.
529 static float calc_replaygain(uint32_t *histogram
)
531 uint32_t loud_count
= 0, total_windows
= 0;
535 for (i
= 0; i
< HISTOGRAM_SLOTS
; i
++)
536 total_windows
+= histogram
[i
];
539 if ((loud_count
+= histogram
[i
]) * 20 >= total_windows
)
542 gain
= (float)(64.54 - i
/ 100.0);
544 return av_clipf(gain
, -24.0, 64.0);
547 static int filter_frame(AVFilterLink
*inlink
, AVFrame
*in
)
549 AVFilterContext
*ctx
= inlink
->dst
;
550 AVFilterLink
*outlink
= ctx
->outputs
[0];
551 ReplayGainContext
*s
= ctx
->priv
;
555 out
= ff_get_audio_buffer(inlink
, in
->nb_samples
);
558 return AVERROR(ENOMEM
);
561 calc_stereo_peak((float *)in
->data
[0],
562 in
->nb_samples
, &s
->peak
);
563 yule_filter_stereo_samples(s
, (const float *)in
->data
[0],
564 (float *)out
->data
[0],
566 butter_filter_stereo_samples(s
, (float *)out
->data
[0],
568 level
= (uint32_t)floor(100 * calc_stereo_rms((float *)out
->data
[0],
570 level
= av_clip(level
, 0, HISTOGRAM_SLOTS
- 1);
572 s
->histogram
[level
]++;
575 return ff_filter_frame(outlink
, in
);
578 static av_cold
void uninit(AVFilterContext
*ctx
)
580 ReplayGainContext
*s
= ctx
->priv
;
581 float gain
= calc_replaygain(s
->histogram
);
583 av_log(ctx
, AV_LOG_INFO
, "track_gain = %+.2f dB\n", gain
);
584 av_log(ctx
, AV_LOG_INFO
, "track_peak = %.6f\n", s
->peak
);
587 static const AVFilterPad replaygain_inputs
[] = {
590 .type
= AVMEDIA_TYPE_AUDIO
,
591 .filter_frame
= filter_frame
,
592 .config_props
= config_input
,
597 static const AVFilterPad replaygain_outputs
[] = {
600 .type
= AVMEDIA_TYPE_AUDIO
,
605 AVFilter ff_af_replaygain
= {
606 .name
= "replaygain",
607 .description
= NULL_IF_CONFIG_SMALL("ReplayGain scanner."),
608 .query_formats
= query_formats
,
610 .priv_size
= sizeof(ReplayGainContext
),
611 .inputs
= replaygain_inputs
,
612 .outputs
= replaygain_outputs
,