FFmpeg
af_replaygain.c
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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 "libavutil/avassert.h"
28 #include "audio.h"
29 #include "avfilter.h"
30 #include "internal.h"
31 
32 #define HISTOGRAM_SLOTS 12000
33 #define BUTTER_ORDER 2
34 #define YULE_ORDER 10
35 
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];
43 
44 static const ReplayGainFreqInfo freqinfos[] =
45 {
46  {
47  192000,
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 },
58  },
59  {
60  176400,
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 },
71  },
72  {
73  144000,
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 },
84  },
85  {
86  128000,
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 },
97  },
98  {
99  112000,
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 },
110  },
111  {
112  96000,
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 },
123  },
124  {
125  88200,
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 },
136  },
137  {
138  64000,
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 },
149  },
150  {
151  56000,
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 },
162  },
163  {
164  48000,
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 },
175  },
176  {
177  44100,
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 },
188  },
189  {
190  37800,
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 },
201  },
202  {
203  32000,
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 },
214  },
215  {
216  24000,
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 },
227  },
228  {
229  22050,
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 },
240  },
241  {
242  18900,
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 },
253  },
254  {
255  16000,
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 },
266  },
267  {
268  12000,
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 },
279  },
280  {
281  11025,
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 },
292  },
293  {
294  8000,
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 },
305  },
306 };
307 
308 typedef struct ReplayGainContext {
310  float peak;
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];
321 
323 {
326  int i, ret;
327 
328  if ((ret = ff_add_format (&formats, AV_SAMPLE_FMT_FLT )) < 0 ||
329  (ret = ff_set_common_formats (ctx , formats )) < 0 ||
332  return ret;
333 
334  formats = NULL;
335  for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) {
337  return ret;
338  }
339 
341 }
342 
344 {
345  AVFilterContext *ctx = inlink->dst;
346  ReplayGainContext *s = ctx->priv;
347  int i;
348 
349  for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) {
350  if (freqinfos[i].sample_rate == inlink->sample_rate)
351  break;
352  }
354 
355  s->yule_coeff_a = freqinfos[i].AYule;
356  s->yule_coeff_b = freqinfos[i].BYule;
357  s->butter_coeff_a = freqinfos[i].AButter;
358  s->butter_coeff_b = freqinfos[i].BButter;
359 
360  s->yule_hist_i = 20;
361  s->butter_hist_i = 4;
362  inlink->min_samples =
363  inlink->max_samples = inlink->sample_rate / 20;
364 
365  return 0;
366 }
367 
368 /*
369  * Update largest absolute sample value.
370  */
371 static void calc_stereo_peak(const float *samples, int nb_samples,
372  float *peak_p)
373 {
374  float peak = 0.0;
375 
376  while (nb_samples--) {
377  if (samples[0] > peak)
378  peak = samples[0];
379  else if (-samples[0] > peak)
380  peak = -samples[0];
381 
382  if (samples[1] > peak)
383  peak = samples[1];
384  else if (-samples[1] > peak)
385  peak = -samples[1];
386 
387  samples += 2;
388  }
389 
390  *peak_p = FFMAX(peak, *peak_p);
391 }
392 
393 /*
394  * Calculate stereo RMS level. Minimum value is about -100 dB for
395  * digital silence. The 90 dB offset is to compensate for the
396  * normalized float range and 3 dB is for stereo samples.
397  */
398 static double calc_stereo_rms(const float *samples, int nb_samples)
399 {
400  int count = nb_samples;
401  double sum = 1e-16;
402 
403  while (count--) {
404  sum += samples[0] * samples[0] + samples[1] * samples[1];
405  samples += 2;
406  }
407 
408  return 10 * log10 (sum / nb_samples) + 90.0 - 3.0;
409 }
410 
411 /*
412  * Optimized implementation of 2nd-order IIR stereo filter.
413  */
415  float *samples, int nb_samples)
416 {
417  const double *coeff_a = s->butter_coeff_a;
418  const double *coeff_b = s->butter_coeff_b;
419  float *hist_a = s->butter_hist_a;
420  float *hist_b = s->butter_hist_b;
421  double left, right;
422  int i, j;
423 
424  i = s->butter_hist_i;
425 
426  // If filter history is very small magnitude, clear it completely
427  // to prevent denormals from rattling around in there forever
428  // (slowing us down).
429 
430  for (j = -4; j < 0; ++j)
431  if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10)
432  break;
433 
434  if (!j) {
435  memset(s->butter_hist_a, 0, sizeof(s->butter_hist_a));
436  memset(s->butter_hist_b, 0, sizeof(s->butter_hist_b));
437  }
438 
439  while (nb_samples--) {
440  left = (hist_b[i ] = samples[0]) * coeff_b[0];
441  right = (hist_b[i + 1] = samples[1]) * coeff_b[0];
442  left += hist_b[i - 2] * coeff_b[1] - hist_a[i - 2] * coeff_a[1];
443  right += hist_b[i - 1] * coeff_b[1] - hist_a[i - 1] * coeff_a[1];
444  left += hist_b[i - 4] * coeff_b[2] - hist_a[i - 4] * coeff_a[2];
445  right += hist_b[i - 3] * coeff_b[2] - hist_a[i - 3] * coeff_a[2];
446  samples[0] = hist_a[i ] = (float) left;
447  samples[1] = hist_a[i + 1] = (float) right;
448  samples += 2;
449 
450  if ((i += 2) == 256) {
451  memcpy(hist_a, hist_a + 252, sizeof(*hist_a) * 4);
452  memcpy(hist_b, hist_b + 252, sizeof(*hist_b) * 4);
453  i = 4;
454  }
455  }
456 
457  s->butter_hist_i = i;
458 }
459 
460 /*
461  * Optimized implementation of 10th-order IIR stereo filter.
462  */
464  float *dst, int nb_samples)
465 {
466  const double *coeff_a = s->yule_coeff_a;
467  const double *coeff_b = s->yule_coeff_b;
468  float *hist_a = s->yule_hist_a;
469  float *hist_b = s->yule_hist_b;
470  double left, right;
471  int i, j;
472 
473  i = s->yule_hist_i;
474 
475  // If filter history is very small magnitude, clear it completely to
476  // prevent denormals from rattling around in there forever
477  // (slowing us down).
478 
479  for (j = -20; j < 0; ++j)
480  if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10)
481  break;
482 
483  if (!j) {
484  memset(s->yule_hist_a, 0, sizeof(s->yule_hist_a));
485  memset(s->yule_hist_b, 0, sizeof(s->yule_hist_b));
486  }
487 
488  while (nb_samples--) {
489  left = (hist_b[i] = src[0]) * coeff_b[0];
490  right = (hist_b[i + 1] = src[1]) * coeff_b[0];
491  left += hist_b[i - 2] * coeff_b[ 1] - hist_a[i - 2] * coeff_a[1 ];
492  right += hist_b[i - 1] * coeff_b[ 1] - hist_a[i - 1] * coeff_a[1 ];
493  left += hist_b[i - 4] * coeff_b[ 2] - hist_a[i - 4] * coeff_a[2 ];
494  right += hist_b[i - 3] * coeff_b[ 2] - hist_a[i - 3] * coeff_a[2 ];
495  left += hist_b[i - 6] * coeff_b[ 3] - hist_a[i - 6] * coeff_a[3 ];
496  right += hist_b[i - 5] * coeff_b[ 3] - hist_a[i - 5] * coeff_a[3 ];
497  left += hist_b[i - 8] * coeff_b[ 4] - hist_a[i - 8] * coeff_a[4 ];
498  right += hist_b[i - 7] * coeff_b[ 4] - hist_a[i - 7] * coeff_a[4 ];
499  left += hist_b[i - 10] * coeff_b[ 5] - hist_a[i - 10] * coeff_a[5 ];
500  right += hist_b[i - 9] * coeff_b[ 5] - hist_a[i - 9] * coeff_a[5 ];
501  left += hist_b[i - 12] * coeff_b[ 6] - hist_a[i - 12] * coeff_a[6 ];
502  right += hist_b[i - 11] * coeff_b[ 6] - hist_a[i - 11] * coeff_a[6 ];
503  left += hist_b[i - 14] * coeff_b[ 7] - hist_a[i - 14] * coeff_a[7 ];
504  right += hist_b[i - 13] * coeff_b[ 7] - hist_a[i - 13] * coeff_a[7 ];
505  left += hist_b[i - 16] * coeff_b[ 8] - hist_a[i - 16] * coeff_a[8 ];
506  right += hist_b[i - 15] * coeff_b[ 8] - hist_a[i - 15] * coeff_a[8 ];
507  left += hist_b[i - 18] * coeff_b[ 9] - hist_a[i - 18] * coeff_a[9 ];
508  right += hist_b[i - 17] * coeff_b[ 9] - hist_a[i - 17] * coeff_a[9 ];
509  left += hist_b[i - 20] * coeff_b[10] - hist_a[i - 20] * coeff_a[10];
510  right += hist_b[i - 19] * coeff_b[10] - hist_a[i - 19] * coeff_a[10];
511  dst[0] = hist_a[i ] = (float)left;
512  dst[1] = hist_a[i + 1] = (float)right;
513  src += 2;
514  dst += 2;
515 
516  if ((i += 2) == 256) {
517  memcpy(hist_a, hist_a + 236, sizeof(*hist_a) * 20);
518  memcpy(hist_b, hist_b + 236, sizeof(*hist_b) * 20);
519  i = 20;
520  }
521  }
522 
523  s->yule_hist_i = i;
524 }
525 
526 /*
527  * Calculate the ReplayGain value from the specified loudness histogram;
528  * clip to -24 / +64 dB.
529  */
530 static float calc_replaygain(uint32_t *histogram)
531 {
532  uint32_t loud_count = 0, total_windows = 0;
533  float gain;
534  int i;
535 
536  for (i = 0; i < HISTOGRAM_SLOTS; i++)
537  total_windows += histogram [i];
538 
539  while (i--)
540  if ((loud_count += histogram [i]) * 20 >= total_windows)
541  break;
542 
543  gain = (float)(64.54 - i / 100.0);
544 
545  return av_clipf(gain, -24.0, 64.0);
546 }
547 
549 {
550  AVFilterContext *ctx = inlink->dst;
551  AVFilterLink *outlink = ctx->outputs[0];
552  ReplayGainContext *s = ctx->priv;
553  int64_t level;
554  AVFrame *out;
555 
556  out = ff_get_audio_buffer(outlink, in->nb_samples);
557  if (!out) {
558  av_frame_free(&in);
559  return AVERROR(ENOMEM);
560  }
561 
562  calc_stereo_peak((float *)in->data[0],
563  in->nb_samples, &s->peak);
564  yule_filter_stereo_samples(s, (const float *)in->data[0],
565  (float *)out->data[0],
566  out->nb_samples);
567  butter_filter_stereo_samples(s, (float *)out->data[0],
568  out->nb_samples);
569  level = lrint(floor(100 * calc_stereo_rms((float *)out->data[0],
570  out->nb_samples)));
572 
573  s->histogram[level]++;
574 
575  av_frame_free(&out);
576  return ff_filter_frame(outlink, in);
577 }
578 
580 {
581  ReplayGainContext *s = ctx->priv;
582  float gain = calc_replaygain(s->histogram);
583 
584  av_log(ctx, AV_LOG_INFO, "track_gain = %+.2f dB\n", gain);
585  av_log(ctx, AV_LOG_INFO, "track_peak = %.6f\n", s->peak);
586 }
587 
588 static const AVFilterPad replaygain_inputs[] = {
589  {
590  .name = "default",
591  .type = AVMEDIA_TYPE_AUDIO,
592  .filter_frame = filter_frame,
593  .config_props = config_input,
594  },
595 };
596 
597 static const AVFilterPad replaygain_outputs[] = {
598  {
599  .name = "default",
600  .type = AVMEDIA_TYPE_AUDIO,
601  },
602 };
603 
605  .name = "replaygain",
606  .description = NULL_IF_CONFIG_SMALL("ReplayGain scanner."),
607  .query_formats = query_formats,
608  .uninit = uninit,
609  .priv_size = sizeof(ReplayGainContext),
612 };
formats
formats
Definition: signature.h:48
ff_get_audio_buffer
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
Definition: audio.c:88
AVFilterChannelLayouts
A list of supported channel layouts.
Definition: formats.h:85
level
uint8_t level
Definition: svq3.c:204
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
out
FILE * out
Definition: movenc.c:54
YULE_ORDER
#define YULE_ORDER
Definition: af_replaygain.c:34
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1019
HISTOGRAM_SLOTS
#define HISTOGRAM_SLOTS
Definition: af_replaygain.c:32
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_replaygain.c:322
ReplayGainContext::butter_hist_i
int butter_hist_i
Definition: af_replaygain.c:311
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
ReplayGainContext
Definition: af_replaygain.c:308
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
ReplayGainContext::butter_coeff_a
const double * butter_coeff_a
Definition: af_replaygain.c:314
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
calc_replaygain
static float calc_replaygain(uint32_t *histogram)
Definition: af_replaygain.c:530
butter_filter_stereo_samples
static void butter_filter_stereo_samples(ReplayGainContext *s, float *samples, int nb_samples)
Definition: af_replaygain.c:414
av_clip64
#define av_clip64
Definition: common.h:99
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
avassert.h
lrint
#define lrint
Definition: tablegen.h:53
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:697
ReplayGainContext::yule_coeff_a
const double * yule_coeff_a
Definition: af_replaygain.c:312
ff_add_channel_layout
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:425
s
#define s(width, name)
Definition: cbs_vp9.c:257
floor
static __device__ float floor(float a)
Definition: cuda_runtime.h:173
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
ctx
AVFormatContext * ctx
Definition: movenc.c:48
ReplayGainFreqInfo::AButter
double AButter[BUTTER_ORDER+1]
Definition: af_replaygain.c:41
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:152
ReplayGainContext::yule_coeff_b
const double * yule_coeff_b
Definition: af_replaygain.c:313
ReplayGainContext::yule_hist_i
int yule_hist_i
Definition: af_replaygain.c:311
ReplayGainContext::butter_coeff_b
const double * butter_coeff_b
Definition: af_replaygain.c:315
ReplayGainContext::butter_hist_a
float butter_hist_a[256]
Definition: af_replaygain.c:318
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: af_replaygain.c:548
fabs
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
ReplayGainContext::peak
float peak
Definition: af_replaygain.c:310
NULL
#define NULL
Definition: coverity.c:32
replaygain_inputs
static const AVFilterPad replaygain_inputs[]
Definition: af_replaygain.c:588
ReplayGainFreqInfo::sample_rate
int sample_rate
Definition: af_replaygain.c:37
av_clipf
#define av_clipf
Definition: common.h:144
src
#define src
Definition: vp8dsp.c:255
ff_add_format
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:419
config_input
static int config_input(AVFilterLink *inlink)
Definition: af_replaygain.c:343
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_replaygain.c:579
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ReplayGainContext::histogram
uint32_t histogram[HISTOGRAM_SLOTS]
Definition: af_replaygain.c:309
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
yule_filter_stereo_samples
static void yule_filter_stereo_samples(ReplayGainContext *s, const float *src, float *dst, int nb_samples)
Definition: af_replaygain.c:463
internal.h
layout
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel layout
Definition: filter_design.txt:18
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:369
i
int i
Definition: input.c:406
ReplayGainContext::yule_hist_b
float yule_hist_b[256]
Definition: af_replaygain.c:317
replaygain_outputs
static const AVFilterPad replaygain_outputs[]
Definition: af_replaygain.c:597
BUTTER_ORDER
#define BUTTER_ORDER
Definition: af_replaygain.c:33
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
calc_stereo_rms
static double calc_stereo_rms(const float *samples, int nb_samples)
Definition: af_replaygain.c:398
AVFilter
Filter definition.
Definition: avfilter.h:149
ret
ret
Definition: filter_design.txt:187
freqinfos
static const ReplayGainFreqInfo freqinfos[]
Definition: af_replaygain.c:44
ReplayGainFreqInfo::BButter
double BButter[BUTTER_ORDER+1]
Definition: af_replaygain.c:40
ReplayGainFreqInfo
Definition: af_replaygain.c:36
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
channel_layout.h
ReplayGainContext::yule_hist_a
float yule_hist_a[256]
Definition: af_replaygain.c:316
avfilter.h
calc_stereo_peak
static void calc_stereo_peak(const float *samples, int nb_samples, float *peak_p)
Definition: af_replaygain.c:371
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
ff_af_replaygain
const AVFilter ff_af_replaygain
Definition: af_replaygain.c:604
AVFilterContext
An instance of a filter.
Definition: avfilter.h:346
audio.h
ReplayGainFreqInfo::AYule
double AYule[YULE_ORDER+1]
Definition: af_replaygain.c:39
ReplayGainContext::butter_hist_b
float butter_hist_b[256]
Definition: af_replaygain.c:319
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:153
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
ff_set_common_samplerates
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:674
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:63
ReplayGainFreqInfo::BYule
double BYule[YULE_ORDER+1]
Definition: af_replaygain.c:38
ff_set_common_channel_layouts
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *channel_layouts)
Helpers for query_formats() which set all free audio links to the same list of channel layouts/sample...
Definition: formats.c:656