DCA: simplify lfe_interpolation_fir()
authorMåns Rullgård <mans@mansr.com>
Mon, 12 Apr 2010 11:14:55 +0000 (11:14 +0000)
committerMåns Rullgård <mans@mansr.com>
Mon, 12 Apr 2010 11:14:55 +0000 (11:14 +0000)
This reorders the lfe_fir tables, and drops the mirrored half,
such that the loops in lfe_interpolation_fir() can be simplified.
The new loop structure should be easier to implement with SIMD.
Static data size is reduced by 2kB.
3% faster on Cortex-A8.

Originally committed as revision 22849 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dca.c
libavcodec/dcadata.h

index 7a6841d..79ea373 100644 (file)
@@ -802,28 +802,37 @@ static void lfe_interpolation_fir(int decimation_select,
 
     int decifactor, k, j;
     const float *prCoeff;
-
-    int interp_index = 0;       /* Index to the interpolated samples */
     int deciindex;
 
     /* Select decimation filter */
     if (decimation_select == 1) {
-        decifactor = 128;
+        decifactor = 64;
         prCoeff = lfe_fir_128;
     } else {
-        decifactor = 64;
+        decifactor = 32;
         prCoeff = lfe_fir_64;
     }
     /* Interpolation */
     for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {
-        /* One decimated sample generates decifactor interpolated ones */
+        float *samples_out2 = samples_out + decifactor;
+        const float *cf0 = prCoeff;
+        const float *cf1 = prCoeff + 256;
+
+        /* One decimated sample generates 2*decifactor interpolated ones */
         for (k = 0; k < decifactor; k++) {
-            float rTmp = 0.0;
-            //FIXME the coeffs are symetric, fix that
-            for (j = 0; j < 512 / decifactor; j++)
-                rTmp += samples_in[deciindex - j] * prCoeff[k + j * decifactor];
-            samples_out[interp_index++] = (rTmp * scale) + bias;
+            float v0 = 0.0;
+            float v1 = 0.0;
+            for (j = 0; j < 256 / decifactor; j++) {
+                float s = samples_in[-j];
+                v0 += s * *cf0++;
+                v1 += s * *--cf1;
+            }
+            *samples_out++  = (v0 * scale) + bias;
+            *samples_out2++ = (v1 * scale) + bias;
         }
+
+        samples_in++;
+        samples_out += decifactor;
     }
 }
 
index c7266aa..657f3c8 100644 (file)
@@ -7315,1039 +7315,204 @@ DECLARE_ALIGNED(16, static const float, fir_32bands_nonperfect)[] =
 +1.390191784E-007
 };
 
-//FIXME the coeffs are symmetric
 static const float lfe_fir_64[] =
 {
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-1.4548087492585180E-002,
-1.3961089774966240E-002,
-1.3392185792326930E-002,
-1.2841059826314450E-002,
-1.2307321652770040E-002,
-1.1790650896728040E-002,
-1.1290682479739190E-002,
-1.0807084850966930E-002,
-1.0339494794607160E-002,
-9.8875602707266800E-003,
-9.4509534537792200E-003,
-9.0293306857347480E-003,
-8.6223213002085690E-003,
-8.2296309992671010E-003,
-7.8508658334612850E-003,
-7.4857366271317010E-003,
-7.1338820271193980E-003,
-6.7949919030070300E-003,
-6.4686913974583150E-003,
-6.1547122895717620E-003,
-5.8526843786239620E-003,
-5.5623454973101620E-003,
-5.2832840010523800E-003,
-5.0153112970292570E-003,
-4.7580120153725150E-003,
-4.5111598446965220E-003,
-4.2744171805679800E-003,
-4.0474990382790560E-003,
-3.8300913292914630E-003,
-3.6219672765582800E-003,
-3.4227769356220960E-003,
-3.2322725746780640E-003,
-3.0501529108732940E-003,
-2.8761904686689380E-003,
-2.7100932784378530E-003,
-2.5515670422464610E-003,
-2.4004334118217230E-003,
-2.2563596721738580E-003,
-2.1191518753767010E-003,
-1.9886041991412640E-003,
-1.8643775256350640E-003,
-1.7463274998590350E-003,
-1.6342115122824910E-003,
-1.5278297942131760E-003,
-1.4268938684836030E-003,
-1.3312589144334200E-003,
-1.2406768510118130E-003,
-1.1550235794857140E-003,
-1.0739302961155770E-003,
-9.9747709464281800E-004,
-9.2511920956894760E-004,
-8.5701106581836940E-004,
-7.9285167157649990E-004,
-7.3241489008069040E-004,
-6.7555153509601950E-004,
-6.2221300322562460E-004,
-5.7215924607589840E-004,
-5.2524596685543660E-004,
-4.8127761692740020E-004,
-4.4018754852004350E-004,
-4.0182814700528980E-004,
-3.6589911906048660E-004,
-3.3283955417573450E-004,
-3.0138631700538100E-004,
-2.7261159266345200E-004,
-2.4602311896160240E-004,
-2.2118473134469240E-004,
-1.9817386055365200E-004,
-1.7699223826639360E-004,
-1.5759580128360540E-004,
-1.3974857574794440E-004,
-1.2333714403212070E-004,
-1.0821702744578940E-004,
-9.4393239123746760E-005,
-8.1793652498163280E-005,
-2.6584343868307770E-004
+    2.658434386830777e-4, 9.029330685734748e-3,
+    7.939263433218002e-2, 2.425158768892288e-1,
+    3.430179357528686e-1, 2.398228943347931e-1,
+    7.746443897485733e-2, 8.622321300208569e-3,
+    8.179365249816328e-5, 9.450953453779220e-3,
+    8.134882897138596e-2, 2.451938837766648e-1,
+    3.429597318172455e-1, 2.371159791946411e-1,
+    7.556436210870743e-2, 8.229630999267101e-3,
+    9.439323912374676e-5, 9.887560270726680e-3,
+    8.333285897970200e-2, 2.478559017181396e-1,
+    3.428434133529663e-1, 2.343961596488952e-1,
+    7.369252294301987e-2, 7.850865833461285e-3,
+    1.082170274457894e-4, 1.033949479460716e-2,
+    8.534456789493561e-2, 2.505008876323700e-1,
+    3.426689505577088e-1, 2.316644787788391e-1,
+    7.184901088476181e-2, 7.485736627131701e-3,
+    1.233371440321207e-4, 1.080708485096693e-2,
+    8.738376945257187e-2, 2.531278133392334e-1,
+    3.424364924430847e-1, 2.289219647645950e-1,
+    7.003392279148102e-2, 7.133882027119398e-3,
+    1.397485757479444e-4, 1.129068247973919e-2,
+    8.945026248693466e-2, 2.557355761528015e-1,
+    3.421461284160614e-1, 2.261696159839630e-1,
+    6.824731826782227e-2, 6.794991903007030e-3,
+    1.575958012836054e-4, 1.179065089672804e-2,
+    9.154383838176728e-2, 2.583232223987580e-1,
+    3.417979776859284e-1, 2.234084606170654e-1,
+    6.648923456668854e-2, 6.468691397458315e-3,
+    1.769922382663936e-4, 1.230732165277004e-2,
+    9.366425126791000e-2, 2.608896791934967e-1,
+    3.413922190666198e-1, 2.206395119428635e-1,
+    6.475970894098282e-2, 6.154712289571762e-3,
+    1.981738605536520e-4, 1.284105982631445e-2,
+    9.581124037504196e-2, 2.634339034557342e-1,
+    3.409290313720703e-1, 2.178637981414795e-1,
+    6.305878609418869e-2, 5.852684378623962e-3,
+    2.211847313446924e-4, 1.339218579232693e-2,
+    9.798453748226166e-2, 2.659549415111542e-1,
+    3.404086530208588e-1, 2.150822728872299e-1,
+    6.138643622398376e-2, 5.562345497310162e-3,
+    2.460231189616024e-4, 1.396108977496624e-2,
+    1.001838669180870e-1, 2.684516608715058e-1,
+    3.398312926292420e-1, 2.122959494590759e-1,
+    5.974265560507774e-2, 5.283284001052380e-3,
+    2.726115926634520e-4, 1.454808749258518e-2,
+    1.024089083075523e-1, 2.709231376647949e-1,
+    3.391972482204438e-1, 2.095058411359787e-1,
+    5.812742188572884e-2, 5.015311297029257e-3,
+    3.013863170053810e-4, 1.515355054289102e-2,
+    1.046593263745308e-1, 2.733682692050934e-1,
+    3.385068178176880e-1, 2.067128717899322e-1,
+    5.654069408774376e-2, 4.758012015372515e-3,
+    3.328395541757345e-4, 1.577781140804291e-2,
+    1.069347932934761e-1, 2.757860720157624e-1,
+    3.377602994441986e-1, 2.039180546998978e-1,
+    5.498242005705833e-2, 4.511159844696522e-3,
+    3.658991190604866e-4, 1.642123050987720e-2,
+    1.092349365353584e-1, 2.781755328178406e-1,
+    3.369580209255218e-1, 2.011223286390304e-1,
+    5.345252528786659e-2, 4.274417180567980e-3,
+    4.018281470052898e-4, 1.708412915468216e-2,
+    1.115593686699867e-1, 2.805356979370117e-1,
+    3.361004292964936e-1, 1.983266174793244e-1,
+    5.195093154907227e-2, 4.047499038279056e-3,
+    4.401875485200435e-4, 1.776690222322941e-2,
+    1.139076948165894e-1, 2.828655838966370e-1,
+    3.351879119873047e-1, 1.955319195985794e-1,
+    5.047753453254700e-2, 3.830091329291463e-3,
+    4.812776169274002e-4, 1.846982724964619e-2,
+    1.162794977426529e-1, 2.851640880107880e-1,
+    3.342207968235016e-1, 1.927391141653061e-1,
+    4.903224110603333e-2, 3.621967276558280e-3,
+    5.252459668554366e-4, 1.919330470263958e-2,
+    1.186743453145027e-1, 2.874303460121155e-1,
+    3.331996202468872e-1, 1.899491697549820e-1,
+    4.761491715908051e-2, 3.422776935622096e-3,
+    5.721592460758984e-4, 1.993762329220772e-2,
+    1.210917681455612e-1, 2.896633744239807e-1,
+    3.321248590946198e-1, 1.871629506349564e-1,
+    4.622544348239899e-2, 3.232272574678064e-3,
+    6.222130032256246e-4, 2.070316113531590e-2,
+    1.235313042998314e-1, 2.918621897697448e-1,
+    3.309969604015350e-1, 1.843813359737396e-1,
+    4.486365616321564e-2, 3.050152910873294e-3,
+    6.755515350960195e-4, 2.149021252989769e-2,
+    1.259924471378326e-1, 2.940258979797364e-1,
+    3.298164308071136e-1, 1.816052496433258e-1,
+    4.352942481637001e-2, 2.876190468668938e-3,
+    7.324148900806904e-4, 2.229913882911205e-2,
+    1.284746825695038e-1, 2.961534857749939e-1,
+    3.285838961601258e-1, 1.788355410099030e-1,
+    4.222255200147629e-2, 2.710093278437853e-3,
+    7.928516715764999e-4, 2.313023805618286e-2,
+    1.309774816036224e-1, 2.982441186904907e-1,
+    3.272998929023742e-1, 1.760730892419815e-1,
+    4.094288870692253e-2, 2.551567042246461e-3,
+    8.570110658183694e-4, 2.398385666310787e-2,
+    1.335003077983856e-1, 3.002967536449432e-1,
+    3.259649574756622e-1, 1.733186990022659e-1,
+    3.969023004174232e-2, 2.400433411821723e-3,
+    9.251192095689476e-4, 2.486028522253036e-2,
+    1.360425949096680e-1, 3.023106753826142e-1,
+    3.245797157287598e-1, 1.705732345581055e-1,
+    3.846437484025955e-2, 2.256359672173858e-3,
+    9.974770946428180e-4, 2.575986087322235e-2,
+    1.386037617921829e-1, 3.042849004268646e-1,
+    3.231448531150818e-1, 1.678375005722046e-1,
+    3.726511076092720e-2, 2.119151875376701e-3,
+    1.073930296115577e-3, 2.668286114931106e-2,
+    1.411831974983215e-1, 3.062185347080230e-1,
+    3.216609656810760e-1, 1.651122719049454e-1,
+    3.609224036335945e-2, 1.988604199141264e-3,
+    1.155023579485714e-3, 2.762960828840732e-2,
+    1.437802612781525e-1, 3.081108033657074e-1,
+    3.201287388801574e-1, 1.623983532190323e-1,
+    3.494550660252571e-2, 1.864377525635064e-3,
+    1.240676851011813e-3, 2.860039286315441e-2,
+    1.463943719863892e-1, 3.099608123302460e-1,
+    3.185488879680634e-1, 1.596965193748474e-1,
+    3.382468968629837e-2, 1.746327499859035e-3,
+    1.331258914433420e-3, 2.959549613296986e-2,
+    1.490248143672943e-1, 3.117676973342896e-1,
+    3.169221282005310e-1, 1.570075154304504e-1,
+    3.272953629493714e-2, 1.634211512282491e-3,
+    1.426893868483603e-3, 3.061520494520664e-2,
+    1.516709625720978e-1, 3.135308027267456e-1,
+    3.152491748332978e-1, 1.543320864439010e-1,
+    3.165979683399200e-2, 1.527829794213176e-3,
 };
 
-//FIXME the coeffs are symmetric
-
 static const float lfe_fir_128[] =
 {
-0.00053168571,
-0.00016358691,
-0.00018878609,
-0.00021643363,
-0.00024667382,
-0.00027949660,
-0.00031519096,
-0.00035398375,
-0.00039634691,
-0.00044236859,
-0.00049204525,
-0.00054522208,
-0.00060277141,
-0.00066567765,
-0.00073179678,
-0.00080365466,
-0.00088037323,
-0.00096255314,
-0.00105048984,
-0.00114431616,
-0.00124442333,
-0.00135110028,
-0.00146482687,
-0.00158570008,
-0.00171401864,
-0.00185023469,
-0.00199495023,
-0.00214785640,
-0.00231004250,
-0.00248134881,
-0.00266251224,
-0.00285378192,
-0.00305565330,
-0.00326841651,
-0.00349264755,
-0.00372874714,
-0.00397720048,
-0.00423829490,
-0.00451271003,
-0.00480085658,
-0.00510312291,
-0.00542017492,
-0.00575236930,
-0.00610029325,
-0.00646453211,
-0.00684553990,
-0.00724391919,
-0.00766016589,
-0.00809498038,
-0.00854881573,
-0.00902230106,
-0.00951600447,
-0.01003060210,
-0.01056654565,
-0.01112466771,
-0.01170534454,
-0.01230939943,
-0.01293735672,
-0.01358995494,
-0.01426773332,
-0.01497144438,
-0.01570170000,
-0.01645922661,
-0.01724460535,
-0.01805862412,
-0.01890186779,
-0.01977507770,
-0.02067894675,
-0.02161412500,
-0.02258131653,
-0.02358125709,
-0.02461459488,
-0.02568206564,
-0.02678431384,
-0.02792212367,
-0.02909611352,
-0.03030703776,
-0.03155555204,
-0.03284239396,
-0.03416819125,
-0.03553372994,
-0.03693958372,
-0.03838652745,
-0.03987516090,
-0.04140623659,
-0.04298033938,
-0.04459818453,
-0.04626038298,
-0.04796761274,
-0.04972046614,
-0.05151961371,
-0.05336561054,
-0.05525910854,
-0.05720067024,
-0.05919086933,
-0.06123027951,
-0.06331945211,
-0.06545893103,
-0.06764923781,
-0.06989086419,
-0.07218432426,
-0.07453006506,
-0.07692859322,
-0.07938029617,
-0.08188561350,
-0.08444493264,
-0.08705867827,
-0.08972713351,
-0.09245070815,
-0.09522963315,
-0.09806428105,
-0.10095486045,
-0.10390164703,
-0.10690483451,
-0.10996460915,
-0.11308115721,
-0.11625462025,
-0.11948505789,
-0.12277261168,
-0.12611730397,
-0.12951917946,
-0.13297818601,
-0.13649433851,
-0.14006754756,
-0.14369773865,
-0.14738474786,
-0.15112841129,
-0.15492856503,
-0.15878495574,
-0.16269733012,
-0.16666537523,
-0.17068879306,
-0.17476719618,
-0.17890018225,
-0.18308731914,
-0.18732811511,
-0.19162209332,
-0.19596865773,
-0.20036731660,
-0.20481738448,
-0.20931822062,
-0.21386915445,
-0.21846942604,
-0.22311829031,
-0.22781492770,
-0.23255851865,
-0.23734821379,
-0.24218304455,
-0.24706205726,
-0.25198432803,
-0.25694879889,
-0.26195442677,
-0.26700007915,
-0.27208462358,
-0.27720692754,
-0.28236576915,
-0.28755992651,
-0.29278811812,
-0.29804900289,
-0.30334126949,
-0.30866351724,
-0.31401440501,
-0.31939238310,
-0.32479602098,
-0.33022382855,
-0.33567428589,
-0.34114575386,
-0.34663668275,
-0.35214546323,
-0.35767036676,
-0.36320972443,
-0.36876192689,
-0.37432509661,
-0.37989753485,
-0.38547745347,
-0.39106300473,
-0.39665243030,
-0.40224379301,
-0.40783521533,
-0.41342487931,
-0.41901078820,
-0.42459106445,
-0.43016362190,
-0.43572667241,
-0.44127810001,
-0.44681602716,
-0.45233830810,
-0.45784294605,
-0.46332800388,
-0.46879136562,
-0.47423094511,
-0.47964480519,
-0.48503074050,
-0.49038675427,
-0.49571081996,
-0.50100076199,
-0.50625455379,
-0.51147013903,
-0.51664537191,
-0.52177828550,
-0.52686679363,
-0.53190881014,
-0.53690224886,
-0.54184508324,
-0.54673534632,
-0.55157101154,
-0.55634999275,
-0.56107026339,
-0.56572991610,
-0.57032698393,
-0.57485944033,
-0.57932555676,
-0.58372318745,
-0.58805054426,
-0.59230577946,
-0.59648692608,
-0.60059231520,
-0.60462015867,
-0.60856848955,
-0.61243581772,
-0.61622029543,
-0.61992025375,
-0.62353414297,
-0.62706029415,
-0.63049703836,
-0.63384294510,
-0.63709646463,
-0.64025616646,
-0.64332056046,
-0.64628833532,
-0.64915806055,
-0.65192854404,
-0.65459835529,
-0.65716648102,
-0.65963155031,
-0.66199249029,
-0.66424828768,
-0.66639786959,
-0.66844022274,
-0.67037439346,
-0.67219948769,
-0.67391467094,
-0.67551922798,
-0.67701220512,
-0.67839306593,
-0.67966115475,
-0.68081587553,
-0.68185669184,
-0.68278300762,
-0.68359452486,
-0.68429082632,
-0.68487155437,
-0.68533653021,
-0.68568539619,
-0.68591803312,
-0.68603444099,
-0.68603444099,
-0.68591803312,
-0.68568539619,
-0.68533653021,
-0.68487155437,
-0.68429082632,
-0.68359452486,
-0.68278300762,
-0.68185669184,
-0.68081587553,
-0.67966115475,
-0.67839306593,
-0.67701220512,
-0.67551922798,
-0.67391467094,
-0.67219948769,
-0.67037439346,
-0.66844022274,
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 };
 
 /* 10^-(dB/20), with dB being a list of dB values ranging from 0 to -72 */