FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/af_replaygain.c
Date: 2024-07-24 19:24:46
Exec Total Coverage
Lines: 0 161 0.0%
Functions: 0 9 0.0%
Branches: 0 66 0.0%

Line Branch Exec Source
1 /*
2 * Copyright (c) 1998 - 2009 Conifer Software
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /**
22 * @file
23 * ReplayGain scanner
24 */
25
26 #include <float.h>
27
28 #include "libavutil/avassert.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/opt.h"
31 #include "audio.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35
36 #define HISTOGRAM_SLOTS 12000
37 #define BUTTER_ORDER 2
38 #define YULE_ORDER 10
39
40 typedef struct ReplayGainFreqInfo {
41 int sample_rate;
42 double BYule[YULE_ORDER + 1];
43 double AYule[YULE_ORDER + 1];
44 double BButter[BUTTER_ORDER + 1];
45 double AButter[BUTTER_ORDER + 1];
46 } ReplayGainFreqInfo;
47
48 static const ReplayGainFreqInfo freqinfos[] =
49 {
50 {
51 192000,
52 { 0.01184742123123, -0.04631092400086, 0.06584226961238,
53 -0.02165588522478, -0.05656260778952, 0.08607493592760,
54 -0.03375544339786, -0.04216579932754, 0.06416711490648,
55 -0.03444708260844, 0.00697275872241 },
56 { 1.00000000000000, -5.24727318348167, 10.60821585192244,
57 -8.74127665810413, -1.33906071371683, 8.07972882096606,
58 -5.46179918950847, 0.54318070652536, 0.87450969224280,
59 -0.34656083539754, 0.03034796843589 },
60 { 0.99653501465135, -1.99307002930271, 0.99653501465135 },
61 { 1.00000000000000, -1.99305802314321, 0.99308203546221 },
62 },
63 {
64 176400,
65 { 0.00268568524529, -0.00852379426080, 0.00852704191347,
66 0.00146116310295, -0.00950855828762, 0.00625449515499,
67 0.00116183868722, -0.00362461417136, 0.00203961000134,
68 -0.00050664587933, 0.00004327455427 },
69 { 1.00000000000000, -5.57512782763045, 12.44291056065794,
70 -12.87462799681221, 3.08554846961576, 6.62493459880692,
71 -7.07662766313248, 2.51175542736441, 0.06731510802735,
72 -0.24567753819213, 0.03961404162376 },
73 { 0.99622916581118, -1.99245833162236, 0.99622916581118 },
74 { 1.00000000000000, -1.99244411238133, 0.99247255086339 },
75 },
76 {
77 144000,
78 { 0.00639682359450, -0.02556437970955, 0.04230854400938,
79 -0.03722462201267, 0.01718514827295, 0.00610592243009,
80 -0.03065965747365, 0.04345745003539, -0.03298592681309,
81 0.01320937236809, -0.00220304127757 },
82 { 1.00000000000000, -6.14814623523425, 15.80002457141566,
83 -20.78487587686937, 11.98848552310315, 3.36462015062606,
84 -10.22419868359470, 6.65599702146473, -1.67141861110485,
85 -0.05417956536718, 0.07374767867406 },
86 { 0.99538268958706, -1.99076537917413, 0.99538268958706 },
87 { 1.00000000000000, -1.99074405950505, 0.99078669884321 },
88 },
89 {
90 128000,
91 { 0.00553120584305, -0.02112620545016, 0.03549076243117,
92 -0.03362498312306, 0.01425867248183, 0.01344686928787,
93 -0.03392770787836, 0.03464136459530, -0.02039116051549,
94 0.00667420794705, -0.00093763762995 },
95 { 1.00000000000000, -6.14581710839925, 16.04785903675838,
96 -22.19089131407749, 15.24756471580286, -0.52001440400238,
97 -8.00488641699940, 6.60916094768855, -2.37856022810923,
98 0.33106947986101, 0.00459820832036 },
99 { 0.99480702681278, -1.98961405362557, 0.99480702681278 },
100 { 1.00000000000000, -1.98958708647324, 0.98964102077790 },
101 },
102 {
103 112000,
104 { 0.00528778718259, -0.01893240907245, 0.03185982561867,
105 -0.02926260297838, 0.00715743034072, 0.01985743355827,
106 -0.03222614850941, 0.02565681978192, -0.01210662313473,
107 0.00325436284541, -0.00044173593001 },
108 { 1.00000000000000, -6.24932108456288, 17.42344320538476,
109 -27.86819709054896, 26.79087344681326,-13.43711081485123,
110 -0.66023612948173, 6.03658091814935, -4.24926577030310,
111 1.40829268709186, -0.19480852628112 },
112 { 0.99406737810867, -1.98813475621734, 0.99406737810867 },
113 { 1.00000000000000, -1.98809955990514, 0.98816995252954 },
114 },
115 {
116 96000,
117 { 0.00588138296683, -0.01613559730421, 0.02184798954216,
118 -0.01742490405317, 0.00464635643780, 0.01117772513205,
119 -0.02123865824368, 0.01959354413350, -0.01079720643523,
120 0.00352183686289, -0.00063124341421 },
121 { 1.00000000000000, -5.97808823642008, 16.21362507964068,
122 -25.72923730652599, 25.40470663139513,-14.66166287771134,
123 2.81597484359752, 2.51447125969733, -2.23575306985286,
124 0.75788151036791, -0.10078025199029 },
125 { 0.99308203517541, -1.98616407035082, 0.99308203517541 },
126 { 1.00000000000000, -1.98611621154089, 0.98621192916075 },
127 },
128 {
129 88200,
130 { 0.02667482047416, -0.11377479336097, 0.23063167910965,
131 -0.30726477945593, 0.33188520686529, -0.33862680249063,
132 0.31807161531340, -0.23730796929880, 0.12273894790371,
133 -0.03840017967282, 0.00549673387936 },
134 { 1.00000000000000, -6.31836451657302, 18.31351310801799,
135 -31.88210014815921, 36.53792146976740,-28.23393036467559,
136 14.24725258227189, -4.04670980012854, 0.18865757280515,
137 0.25420333563908, -0.06012333531065 },
138 { 0.99247255046129, -1.98494510092259, 0.99247255046129 },
139 { 1.00000000000000, -1.98488843762335, 0.98500176422183 },
140 },
141 {
142 64000,
143 { 0.02613056568174, -0.08128786488109, 0.14937282347325,
144 -0.21695711675126, 0.25010286673402, -0.23162283619278,
145 0.17424041833052, -0.10299599216680, 0.04258696481981,
146 -0.00977952936493, 0.00105325558889 },
147 { 1.00000000000000, -5.73625477092119, 16.15249794355035,
148 -29.68654912464508, 39.55706155674083,-39.82524556246253,
149 30.50605345013009,-17.43051772821245, 7.05154573908017,
150 -1.80783839720514, 0.22127840210813 },
151 { 0.98964101933472, -1.97928203866944, 0.98964101933472 },
152 { 1.00000000000000, -1.97917472731009, 0.97938935002880 },
153 },
154 {
155 56000,
156 { 0.03144914734085, -0.06151729206963, 0.08066788708145,
157 -0.09737939921516, 0.08943210803999, -0.06989984672010,
158 0.04926972841044, -0.03161257848451, 0.01456837493506,
159 -0.00316015108496, 0.00132807215875 },
160 { 1.00000000000000, -4.87377313090032, 12.03922160140209,
161 -20.10151118381395, 25.10388534415171,-24.29065560815903,
162 18.27158469090663,-10.45249552560593, 4.30319491872003,
163 -1.13716992070185, 0.14510733527035 },
164 { 0.98816995007392, -1.97633990014784, 0.98816995007392 },
165 { 1.00000000000000, -1.97619994516973, 0.97647985512594 },
166 },
167 {
168 48000,
169 { 0.03857599435200, -0.02160367184185, -0.00123395316851,
170 -0.00009291677959, -0.01655260341619, 0.02161526843274,
171 -0.02074045215285, 0.00594298065125, 0.00306428023191,
172 0.00012025322027, 0.00288463683916 },
173 { 1.00000000000000, -3.84664617118067, 7.81501653005538,
174 -11.34170355132042, 13.05504219327545,-12.28759895145294,
175 9.48293806319790, -5.87257861775999, 2.75465861874613,
176 -0.86984376593551, 0.13919314567432 },
177 { 0.98621192462708, -1.97242384925416, 0.98621192462708 },
178 { 1.00000000000000, -1.97223372919527, 0.97261396931306 },
179 },
180 {
181 44100,
182 { 0.05418656406430, -0.02911007808948, -0.00848709379851,
183 -0.00851165645469, -0.00834990904936, 0.02245293253339,
184 -0.02596338512915, 0.01624864962975, -0.00240879051584,
185 0.00674613682247, -0.00187763777362 },
186 { 1.00000000000000, -3.47845948550071, 6.36317777566148,
187 -8.54751527471874, 9.47693607801280, -8.81498681370155,
188 6.85401540936998, -4.39470996079559, 2.19611684890774,
189 -0.75104302451432, 0.13149317958808 },
190 { 0.98500175787242, -1.97000351574484, 0.98500175787242 },
191 { 1.00000000000000, -1.96977855582618, 0.97022847566350 },
192 },
193 {
194 37800,
195 { 0.08717879977844, -0.01000374016172, -0.06265852122368,
196 -0.01119328800950, -0.00114279372960, 0.02081333954769,
197 -0.01603261863207, 0.01936763028546, 0.00760044736442,
198 -0.00303979112271, -0.00075088605788 },
199 { 1.00000000000000, -2.62816311472146, 3.53734535817992,
200 -3.81003448678921, 3.91291636730132, -3.53518605896288,
201 2.71356866157873, -1.86723311846592, 1.12075382367659,
202 -0.48574086886890, 0.11330544663849 },
203 { 0.98252400815195, -1.96504801630391, 0.98252400815195 },
204 { 1.00000000000000, -1.96474258269041, 0.96535344991740 },
205 },
206 {
207 32000,
208 { 0.15457299681924, -0.09331049056315, -0.06247880153653,
209 0.02163541888798, -0.05588393329856, 0.04781476674921,
210 0.00222312597743, 0.03174092540049, -0.01390589421898,
211 0.00651420667831, -0.00881362733839 },
212 { 1.00000000000000, -2.37898834973084, 2.84868151156327,
213 -2.64577170229825, 2.23697657451713, -1.67148153367602,
214 1.00595954808547, -0.45953458054983, 0.16378164858596,
215 -0.05032077717131, 0.02347897407020 },
216 { 0.97938932735214, -1.95877865470428, 0.97938932735214 },
217 { 1.00000000000000, -1.95835380975398, 0.95920349965459 },
218 },
219 {
220 24000,
221 { 0.30296907319327, -0.22613988682123, -0.08587323730772,
222 0.03282930172664, -0.00915702933434, -0.02364141202522,
223 -0.00584456039913, 0.06276101321749, -0.00000828086748,
224 0.00205861885564, -0.02950134983287 },
225 { 1.00000000000000, -1.61273165137247, 1.07977492259970,
226 -0.25656257754070, -0.16276719120440, -0.22638893773906,
227 0.39120800788284, -0.22138138954925, 0.04500235387352,
228 0.02005851806501, 0.00302439095741 },
229 { 0.97531843204928, -1.95063686409857, 0.97531843204928 },
230 { 1.00000000000000, -1.95002759149878, 0.95124613669835 },
231 },
232 {
233 22050,
234 { 0.33642304856132, -0.25572241425570, -0.11828570177555,
235 0.11921148675203, -0.07834489609479, -0.00469977914380,
236 -0.00589500224440, 0.05724228140351, 0.00832043980773,
237 -0.01635381384540, -0.01760176568150 },
238 { 1.00000000000000, -1.49858979367799, 0.87350271418188,
239 0.12205022308084, -0.80774944671438, 0.47854794562326,
240 -0.12453458140019, -0.04067510197014, 0.08333755284107,
241 -0.04237348025746, 0.02977207319925 },
242 { 0.97316523498161, -1.94633046996323, 0.97316523498161 },
243 { 1.00000000000000, -1.94561023566527, 0.94705070426118 },
244 },
245 {
246 18900,
247 { 0.38524531015142, -0.27682212062067, -0.09980181488805,
248 0.09951486755646, -0.08934020156622, -0.00322369330199,
249 -0.00110329090689, 0.03784509844682, 0.01683906213303,
250 -0.01147039862572, -0.01941767987192 },
251 { 1.00000000000000, -1.29708918404534, 0.90399339674203,
252 -0.29613799017877, -0.42326645916207, 0.37934887402200,
253 -0.37919795944938, 0.23410283284785, -0.03892971758879,
254 0.00403009552351, 0.03640166626278 },
255 { 0.96535326815829, -1.93070653631658, 0.96535326815829 },
256 { 1.00000000000000, -1.92950577983524, 0.93190729279793 },
257 },
258 {
259 16000,
260 { 0.44915256608450, -0.14351757464547, -0.22784394429749,
261 -0.01419140100551, 0.04078262797139, -0.12398163381748,
262 0.04097565135648, 0.10478503600251, -0.01863887810927,
263 -0.03193428438915, 0.00541907748707 },
264 { 1.00000000000000, -0.62820619233671, 0.29661783706366,
265 -0.37256372942400, 0.00213767857124, -0.42029820170918,
266 0.22199650564824, 0.00613424350682, 0.06747620744683,
267 0.05784820375801, 0.03222754072173 },
268 { 0.96454515552826, -1.92909031105652, 0.96454515552826 },
269 { 1.00000000000000, -1.92783286977036, 0.93034775234268 },
270 },
271 {
272 12000,
273 { 0.56619470757641, -0.75464456939302, 0.16242137742230,
274 0.16744243493672, -0.18901604199609, 0.30931782841830,
275 -0.27562961986224, 0.00647310677246, 0.08647503780351,
276 -0.03788984554840, -0.00588215443421 },
277 { 1.00000000000000, -1.04800335126349, 0.29156311971249,
278 -0.26806001042947, 0.00819999645858, 0.45054734505008,
279 -0.33032403314006, 0.06739368333110, -0.04784254229033,
280 0.01639907836189, 0.01807364323573 },
281 { 0.96009142950541, -1.92018285901082, 0.96009142950541 },
282 { 1.00000000000000, -1.91858953033784, 0.92177618768381 },
283 },
284 {
285 11025,
286 { 0.58100494960553, -0.53174909058578, -0.14289799034253,
287 0.17520704835522, 0.02377945217615, 0.15558449135573,
288 -0.25344790059353, 0.01628462406333, 0.06920467763959,
289 -0.03721611395801, -0.00749618797172 },
290 { 1.00000000000000, -0.51035327095184, -0.31863563325245,
291 -0.20256413484477, 0.14728154134330, 0.38952639978999,
292 -0.23313271880868, -0.05246019024463, -0.02505961724053,
293 0.02442357316099, 0.01818801111503 },
294 { 0.95856916599601, -1.91713833199203, 0.95856916599601 },
295 { 1.00000000000000, -1.91542108074780, 0.91885558323625 },
296 },
297 {
298 8000,
299 { 0.53648789255105, -0.42163034350696, -0.00275953611929,
300 0.04267842219415, -0.10214864179676, 0.14590772289388,
301 -0.02459864859345, -0.11202315195388, -0.04060034127000,
302 0.04788665548180, -0.02217936801134 },
303 { 1.00000000000000, -0.25049871956020, -0.43193942311114,
304 -0.03424681017675, -0.04678328784242, 0.26408300200955,
305 0.15113130533216, -0.17556493366449, -0.18823009262115,
306 0.05477720428674, 0.04704409688120 },
307 { 0.94597685600279, -1.89195371200558, 0.94597685600279 },
308 { 1.00000000000000, -1.88903307939452, 0.89487434461664 },
309 },
310 };
311
312 typedef struct ReplayGainContext {
313 const AVClass *class;
314
315 uint32_t histogram[HISTOGRAM_SLOTS];
316 float peak;
317 float gain;
318 int yule_hist_i, butter_hist_i;
319 const double *yule_coeff_a;
320 const double *yule_coeff_b;
321 const double *butter_coeff_a;
322 const double *butter_coeff_b;
323 float yule_hist_a[256];
324 float yule_hist_b[256];
325 float butter_hist_a[256];
326 float butter_hist_b[256];
327 } ReplayGainContext;
328
329 static int query_formats(AVFilterContext *ctx)
330 {
331 AVFilterFormats *formats = NULL;
332 AVFilterChannelLayouts *layout = NULL;
333 int i, ret;
334
335 if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 ||
336 (ret = ff_set_common_formats (ctx , formats )) < 0 ||
337 (ret = ff_add_channel_layout (&layout , &(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO)) < 0 ||
338 (ret = ff_set_common_channel_layouts (ctx , layout )) < 0)
339 return ret;
340
341 formats = NULL;
342 for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) {
343 if ((ret = ff_add_format(&formats, freqinfos[i].sample_rate)) < 0)
344 return ret;
345 }
346
347 return ff_set_common_samplerates(ctx, formats);
348 }
349
350 static int config_input(AVFilterLink *inlink)
351 {
352 AVFilterContext *ctx = inlink->dst;
353 ReplayGainContext *s = ctx->priv;
354 int i;
355
356 for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) {
357 if (freqinfos[i].sample_rate == inlink->sample_rate)
358 break;
359 }
360 av_assert0(i < FF_ARRAY_ELEMS(freqinfos));
361
362 s->yule_coeff_a = freqinfos[i].AYule;
363 s->yule_coeff_b = freqinfos[i].BYule;
364 s->butter_coeff_a = freqinfos[i].AButter;
365 s->butter_coeff_b = freqinfos[i].BButter;
366
367 s->yule_hist_i = 20;
368 s->butter_hist_i = 4;
369 inlink->min_samples =
370 inlink->max_samples = inlink->sample_rate / 20;
371
372 return 0;
373 }
374
375 /*
376 * Update largest absolute sample value.
377 */
378 static void calc_stereo_peak(const float *samples, int nb_samples,
379 float *peak_p)
380 {
381 float peak = 0.0;
382
383 while (nb_samples--) {
384 if (samples[0] > peak)
385 peak = samples[0];
386 else if (-samples[0] > peak)
387 peak = -samples[0];
388
389 if (samples[1] > peak)
390 peak = samples[1];
391 else if (-samples[1] > peak)
392 peak = -samples[1];
393
394 samples += 2;
395 }
396
397 *peak_p = FFMAX(peak, *peak_p);
398 }
399
400 /*
401 * Calculate stereo RMS level. Minimum value is about -100 dB for
402 * digital silence. The 90 dB offset is to compensate for the
403 * normalized float range and 3 dB is for stereo samples.
404 */
405 static double calc_stereo_rms(const float *samples, int nb_samples)
406 {
407 int count = nb_samples;
408 double sum = 1e-16;
409
410 while (count--) {
411 sum += samples[0] * samples[0] + samples[1] * samples[1];
412 samples += 2;
413 }
414
415 return 10 * log10 (sum / nb_samples) + 90.0 - 3.0;
416 }
417
418 /*
419 * Optimized implementation of 2nd-order IIR stereo filter.
420 */
421 static void butter_filter_stereo_samples(ReplayGainContext *s,
422 float *samples, int nb_samples)
423 {
424 const double *coeff_a = s->butter_coeff_a;
425 const double *coeff_b = s->butter_coeff_b;
426 float *hist_a = s->butter_hist_a;
427 float *hist_b = s->butter_hist_b;
428 double left, right;
429 int i, j;
430
431 i = s->butter_hist_i;
432
433 // If filter history is very small magnitude, clear it completely
434 // to prevent denormals from rattling around in there forever
435 // (slowing us down).
436
437 for (j = -4; j < 0; ++j)
438 if (fabsf(hist_a[i + j]) > 1e-10f || fabsf(hist_b[i + j]) > 1e-10f)
439 break;
440
441 if (!j) {
442 memset(s->butter_hist_a, 0, sizeof(s->butter_hist_a));
443 memset(s->butter_hist_b, 0, sizeof(s->butter_hist_b));
444 }
445
446 while (nb_samples--) {
447 left = (hist_b[i ] = samples[0]) * coeff_b[0];
448 right = (hist_b[i + 1] = samples[1]) * coeff_b[0];
449 left += hist_b[i - 2] * coeff_b[1] - hist_a[i - 2] * coeff_a[1];
450 right += hist_b[i - 1] * coeff_b[1] - hist_a[i - 1] * coeff_a[1];
451 left += hist_b[i - 4] * coeff_b[2] - hist_a[i - 4] * coeff_a[2];
452 right += hist_b[i - 3] * coeff_b[2] - hist_a[i - 3] * coeff_a[2];
453 samples[0] = hist_a[i ] = (float) left;
454 samples[1] = hist_a[i + 1] = (float) right;
455 samples += 2;
456
457 if ((i += 2) == 256) {
458 memcpy(hist_a, hist_a + 252, sizeof(*hist_a) * 4);
459 memcpy(hist_b, hist_b + 252, sizeof(*hist_b) * 4);
460 i = 4;
461 }
462 }
463
464 s->butter_hist_i = i;
465 }
466
467 /*
468 * Optimized implementation of 10th-order IIR stereo filter.
469 */
470 static void yule_filter_stereo_samples(ReplayGainContext *s, const float *src,
471 float *dst, int nb_samples)
472 {
473 const double *coeff_a = s->yule_coeff_a;
474 const double *coeff_b = s->yule_coeff_b;
475 float *hist_a = s->yule_hist_a;
476 float *hist_b = s->yule_hist_b;
477 double left, right;
478 int i, j;
479
480 i = s->yule_hist_i;
481
482 // If filter history is very small magnitude, clear it completely to
483 // prevent denormals from rattling around in there forever
484 // (slowing us down).
485
486 for (j = -20; j < 0; ++j)
487 if (fabsf(hist_a[i + j]) > 1e-10f || fabsf(hist_b[i + j]) > 1e-10f)
488 break;
489
490 if (!j) {
491 memset(s->yule_hist_a, 0, sizeof(s->yule_hist_a));
492 memset(s->yule_hist_b, 0, sizeof(s->yule_hist_b));
493 }
494
495 while (nb_samples--) {
496 left = (hist_b[i] = src[0]) * coeff_b[0];
497 right = (hist_b[i + 1] = src[1]) * coeff_b[0];
498 left += hist_b[i - 2] * coeff_b[ 1] - hist_a[i - 2] * coeff_a[1 ];
499 right += hist_b[i - 1] * coeff_b[ 1] - hist_a[i - 1] * coeff_a[1 ];
500 left += hist_b[i - 4] * coeff_b[ 2] - hist_a[i - 4] * coeff_a[2 ];
501 right += hist_b[i - 3] * coeff_b[ 2] - hist_a[i - 3] * coeff_a[2 ];
502 left += hist_b[i - 6] * coeff_b[ 3] - hist_a[i - 6] * coeff_a[3 ];
503 right += hist_b[i - 5] * coeff_b[ 3] - hist_a[i - 5] * coeff_a[3 ];
504 left += hist_b[i - 8] * coeff_b[ 4] - hist_a[i - 8] * coeff_a[4 ];
505 right += hist_b[i - 7] * coeff_b[ 4] - hist_a[i - 7] * coeff_a[4 ];
506 left += hist_b[i - 10] * coeff_b[ 5] - hist_a[i - 10] * coeff_a[5 ];
507 right += hist_b[i - 9] * coeff_b[ 5] - hist_a[i - 9] * coeff_a[5 ];
508 left += hist_b[i - 12] * coeff_b[ 6] - hist_a[i - 12] * coeff_a[6 ];
509 right += hist_b[i - 11] * coeff_b[ 6] - hist_a[i - 11] * coeff_a[6 ];
510 left += hist_b[i - 14] * coeff_b[ 7] - hist_a[i - 14] * coeff_a[7 ];
511 right += hist_b[i - 13] * coeff_b[ 7] - hist_a[i - 13] * coeff_a[7 ];
512 left += hist_b[i - 16] * coeff_b[ 8] - hist_a[i - 16] * coeff_a[8 ];
513 right += hist_b[i - 15] * coeff_b[ 8] - hist_a[i - 15] * coeff_a[8 ];
514 left += hist_b[i - 18] * coeff_b[ 9] - hist_a[i - 18] * coeff_a[9 ];
515 right += hist_b[i - 17] * coeff_b[ 9] - hist_a[i - 17] * coeff_a[9 ];
516 left += hist_b[i - 20] * coeff_b[10] - hist_a[i - 20] * coeff_a[10];
517 right += hist_b[i - 19] * coeff_b[10] - hist_a[i - 19] * coeff_a[10];
518 dst[0] = hist_a[i ] = (float)left;
519 dst[1] = hist_a[i + 1] = (float)right;
520 src += 2;
521 dst += 2;
522
523 if ((i += 2) == 256) {
524 memcpy(hist_a, hist_a + 236, sizeof(*hist_a) * 20);
525 memcpy(hist_b, hist_b + 236, sizeof(*hist_b) * 20);
526 i = 20;
527 }
528 }
529
530 s->yule_hist_i = i;
531 }
532
533 /*
534 * Calculate the ReplayGain value from the specified loudness histogram;
535 * clip to -24 / +64 dB.
536 */
537 static float calc_replaygain(uint32_t *histogram)
538 {
539 uint32_t loud_count = 0, total_windows = 0;
540 float gain;
541 int i;
542
543 for (i = 0; i < HISTOGRAM_SLOTS; i++)
544 total_windows += histogram [i];
545
546 while (i--)
547 if ((loud_count += histogram [i]) * 20 >= total_windows)
548 break;
549
550 gain = (float)(64.54 - i / 100.0);
551
552 return av_clipf(gain, -24.0, 64.0);
553 }
554
555 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
556 {
557 AVFilterContext *ctx = inlink->dst;
558 AVFilterLink *outlink = ctx->outputs[0];
559 ReplayGainContext *s = ctx->priv;
560 int64_t level;
561 AVFrame *out;
562
563 out = ff_get_audio_buffer(outlink, in->nb_samples);
564 if (!out) {
565 av_frame_free(&in);
566 return AVERROR(ENOMEM);
567 }
568
569 calc_stereo_peak((float *)in->data[0],
570 in->nb_samples, &s->peak);
571 yule_filter_stereo_samples(s, (const float *)in->data[0],
572 (float *)out->data[0],
573 out->nb_samples);
574 butter_filter_stereo_samples(s, (float *)out->data[0],
575 out->nb_samples);
576 level = lrint(floor(100 * calc_stereo_rms((float *)out->data[0],
577 out->nb_samples)));
578 level = av_clip64(level, 0, HISTOGRAM_SLOTS - 1);
579
580 s->histogram[level]++;
581
582 av_frame_free(&out);
583 return ff_filter_frame(outlink, in);
584 }
585
586 static int request_frame(AVFilterLink *outlink)
587 {
588 AVFilterContext *ctx = outlink->src;
589 ReplayGainContext *s = ctx->priv;
590 int ret = 0;
591
592 ret = ff_request_frame(ctx->inputs[0]);
593
594 if (ret == AVERROR_EOF) {
595 s->gain = calc_replaygain(s->histogram);
596
597 av_log(ctx, AV_LOG_INFO, "track_gain = %+.2f dB\n", s->gain);
598 av_log(ctx, AV_LOG_INFO, "track_peak = %.6f\n", s->peak);
599 }
600
601 return ret;
602 }
603
604 static const AVFilterPad replaygain_inputs[] = {
605 {
606 .name = "default",
607 .type = AVMEDIA_TYPE_AUDIO,
608 .filter_frame = filter_frame,
609 .config_props = config_input,
610 },
611 };
612
613 static const AVFilterPad replaygain_outputs[] = {
614 {
615 .name = "default",
616 .type = AVMEDIA_TYPE_AUDIO,
617 .request_frame = request_frame,
618 },
619 };
620
621 #define OFFSET(x) offsetof(ReplayGainContext, x)
622 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_EXPORT|AV_OPT_FLAG_READONLY
623
624 static const AVOption replaygain_options[] = {
625 { "track_gain", "track gain (dB)", OFFSET(gain), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
626 { "track_peak", "track peak", OFFSET(peak), AV_OPT_TYPE_FLOAT,{.dbl=0}, -FLT_MAX, FLT_MAX, FLAGS },
627 { NULL }
628 };
629
630 AVFILTER_DEFINE_CLASS(replaygain);
631
632 const AVFilter ff_af_replaygain = {
633 .name = "replaygain",
634 .description = NULL_IF_CONFIG_SMALL("ReplayGain scanner."),
635 .priv_size = sizeof(ReplayGainContext),
636 .priv_class = &replaygain_class,
637 .flags = AVFILTER_FLAG_METADATA_ONLY,
638 FILTER_INPUTS(replaygain_inputs),
639 FILTER_OUTPUTS(replaygain_outputs),
640 FILTER_QUERY_FUNC(query_formats),
641 };
642