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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" | |
27 | #include "libavutil/channel_layout.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 { | |
37 | int sample_rate; | |
38 | double BYule[YULE_ORDER + 1]; | |
39 | double AYule[YULE_ORDER + 1]; | |
40 | double BButter[BUTTER_ORDER + 1]; | |
41 | double AButter[BUTTER_ORDER + 1]; | |
42 | } ReplayGainFreqInfo; | |
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 { | |
309 | uint32_t histogram[HISTOGRAM_SLOTS]; | |
310 | float peak; | |
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]; | |
320 | } ReplayGainContext; | |
321 | ||
322 | static int query_formats(AVFilterContext *ctx) | |
323 | { | |
324 | AVFilterFormats *formats = NULL; | |
325 | AVFilterChannelLayouts *layout = NULL; | |
326 | int i; | |
327 | ||
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); | |
332 | ||
333 | formats = NULL; | |
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); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static int config_input(AVFilterLink *inlink) | |
342 | { | |
343 | AVFilterContext *ctx = inlink->dst; | |
344 | ReplayGainContext *s = ctx->priv; | |
345 | int i; | |
346 | ||
347 | for (i = 0; i < FF_ARRAY_ELEMS(freqinfos); i++) { | |
348 | if (freqinfos[i].sample_rate == inlink->sample_rate) | |
349 | break; | |
350 | } | |
351 | av_assert0(i < FF_ARRAY_ELEMS(freqinfos)); | |
352 | ||
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; | |
357 | ||
358 | s->yule_hist_i = 20; | |
359 | s->butter_hist_i = 4; | |
360 | inlink->partial_buf_size = | |
361 | inlink->min_samples = | |
362 | inlink->max_samples = inlink->sample_rate / 20; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Update largest absolute sample value. | |
369 | */ | |
370 | static void calc_stereo_peak(const float *samples, int nb_samples, | |
371 | float *peak_p) | |
372 | { | |
373 | float peak = 0.0; | |
374 | ||
375 | while (nb_samples--) { | |
376 | if (samples[0] > peak) | |
377 | peak = samples[0]; | |
378 | else if (-samples[0] > peak) | |
379 | peak = -samples[0]; | |
380 | ||
381 | if (samples[1] > peak) | |
382 | peak = samples[1]; | |
383 | else if (-samples[1] > peak) | |
384 | peak = -samples[1]; | |
385 | ||
386 | samples += 2; | |
387 | } | |
388 | ||
389 | *peak_p = FFMAX(peak, *peak_p); | |
390 | } | |
391 | ||
392 | /* | |
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. | |
396 | */ | |
397 | static double calc_stereo_rms(const float *samples, int nb_samples) | |
398 | { | |
399 | int count = nb_samples; | |
400 | double sum = 1e-16; | |
401 | ||
402 | while (count--) { | |
403 | sum += samples[0] * samples[0] + samples[1] * samples[1]; | |
404 | samples += 2; | |
405 | } | |
406 | ||
407 | return 10 * log10 (sum / nb_samples) + 90.0 - 3.0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Optimized implementation of 2nd-order IIR stereo filter. | |
412 | */ | |
413 | static void butter_filter_stereo_samples(ReplayGainContext *s, | |
414 | float *samples, int nb_samples) | |
415 | { | |
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; | |
420 | double left, right; | |
421 | int i, j; | |
422 | ||
423 | i = s->butter_hist_i; | |
424 | ||
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). | |
428 | ||
429 | for (j = -4; j < 0; ++j) | |
430 | if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10) | |
431 | break; | |
432 | ||
433 | if (!j) { | |
434 | memset(s->butter_hist_a, 0, sizeof(s->butter_hist_a)); | |
435 | memset(s->butter_hist_b, 0, sizeof(s->butter_hist_b)); | |
436 | } | |
437 | ||
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; | |
447 | samples += 2; | |
448 | ||
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); | |
452 | i = 4; | |
453 | } | |
454 | } | |
455 | ||
456 | s->butter_hist_i = i; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Optimized implementation of 10th-order IIR stereo filter. | |
461 | */ | |
462 | static void yule_filter_stereo_samples(ReplayGainContext *s, const float *src, | |
463 | float *dst, int nb_samples) | |
464 | { | |
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; | |
469 | double left, right; | |
470 | int i, j; | |
471 | ||
472 | i = s->yule_hist_i; | |
473 | ||
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). | |
477 | ||
478 | for (j = -20; j < 0; ++j) | |
479 | if (fabs(hist_a[i + j]) > 1e-10 || fabs(hist_b[i + j]) > 1e-10) | |
480 | break; | |
481 | ||
482 | if (!j) { | |
483 | memset(s->yule_hist_a, 0, sizeof(s->yule_hist_a)); | |
484 | memset(s->yule_hist_b, 0, sizeof(s->yule_hist_b)); | |
485 | } | |
486 | ||
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; | |
512 | src += 2; | |
513 | dst += 2; | |
514 | ||
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); | |
518 | i = 20; | |
519 | } | |
520 | } | |
521 | ||
522 | s->yule_hist_i = i; | |
523 | } | |
524 | ||
525 | /* | |
526 | * Calculate the ReplayGain value from the specified loudness histogram; | |
527 | * clip to -24 / +64 dB. | |
528 | */ | |
529 | static float calc_replaygain(uint32_t *histogram) | |
530 | { | |
531 | uint32_t loud_count = 0, total_windows = 0; | |
532 | float gain; | |
533 | int i; | |
534 | ||
535 | for (i = 0; i < HISTOGRAM_SLOTS; i++) | |
536 | total_windows += histogram [i]; | |
537 | ||
538 | while (i--) | |
539 | if ((loud_count += histogram [i]) * 20 >= total_windows) | |
540 | break; | |
541 | ||
542 | gain = (float)(64.54 - i / 100.0); | |
543 | ||
544 | return av_clipf(gain, -24.0, 64.0); | |
545 | } | |
546 | ||
547 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) | |
548 | { | |
549 | AVFilterContext *ctx = inlink->dst; | |
550 | AVFilterLink *outlink = ctx->outputs[0]; | |
551 | ReplayGainContext *s = ctx->priv; | |
552 | uint32_t level; | |
553 | AVFrame *out; | |
554 | ||
555 | out = ff_get_audio_buffer(inlink, in->nb_samples); | |
556 | if (!out) { | |
557 | av_frame_free(&in); | |
558 | return AVERROR(ENOMEM); | |
559 | } | |
560 | ||
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], | |
565 | out->nb_samples); | |
566 | butter_filter_stereo_samples(s, (float *)out->data[0], | |
567 | out->nb_samples); | |
568 | level = (uint32_t)floor(100 * calc_stereo_rms((float *)out->data[0], | |
569 | out->nb_samples)); | |
570 | level = av_clip(level, 0, HISTOGRAM_SLOTS - 1); | |
571 | ||
572 | s->histogram[level]++; | |
573 | ||
574 | av_frame_free(&out); | |
575 | return ff_filter_frame(outlink, in); | |
576 | } | |
577 | ||
578 | static av_cold void uninit(AVFilterContext *ctx) | |
579 | { | |
580 | ReplayGainContext *s = ctx->priv; | |
581 | float gain = calc_replaygain(s->histogram); | |
582 | ||
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); | |
585 | } | |
586 | ||
587 | static const AVFilterPad replaygain_inputs[] = { | |
588 | { | |
589 | .name = "default", | |
590 | .type = AVMEDIA_TYPE_AUDIO, | |
591 | .filter_frame = filter_frame, | |
592 | .config_props = config_input, | |
593 | }, | |
594 | { NULL } | |
595 | }; | |
596 | ||
597 | static const AVFilterPad replaygain_outputs[] = { | |
598 | { | |
599 | .name = "default", | |
600 | .type = AVMEDIA_TYPE_AUDIO, | |
601 | }, | |
602 | { NULL } | |
603 | }; | |
604 | ||
605 | AVFilter ff_af_replaygain = { | |
606 | .name = "replaygain", | |
607 | .description = NULL_IF_CONFIG_SMALL("ReplayGain scanner."), | |
608 | .query_formats = query_formats, | |
609 | .uninit = uninit, | |
610 | .priv_size = sizeof(ReplayGainContext), | |
611 | .inputs = replaygain_inputs, | |
612 | .outputs = replaygain_outputs, | |
613 | }; |