LCOV - code coverage report
Current view: top level - libavcodec - nellymoser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 85 86 98.8 %
Date: 2017-12-17 04:34:43 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Common code between Nellymoser encoder and decoder
       3             :  * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
       4             :  *                    539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
       5             :  *                    520e17cd55896441042b14df2566a6eb610ed444
       6             :  * Copyright (c) 2007 Loic Minier <lool at dooz.org>
       7             :  *                    Benjamin Larsson
       8             :  *
       9             :  * Permission is hereby granted, free of charge, to any person obtaining a
      10             :  * copy of this software and associated documentation files (the "Software"),
      11             :  * to deal in the Software without restriction, including without limitation
      12             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      13             :  * and/or sell copies of the Software, and to permit persons to whom the
      14             :  * Software is furnished to do so, subject to the following conditions:
      15             :  *
      16             :  * The above copyright notice and this permission notice shall be included in
      17             :  * all copies or substantial portions of the Software.
      18             :  *
      19             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      20             :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      21             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      22             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      23             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      24             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      25             :  * DEALINGS IN THE SOFTWARE.
      26             :  */
      27             : 
      28             : /**
      29             :  * @file
      30             :  * The 3 alphanumeric copyright notices are md5summed they are from the original
      31             :  * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
      32             :  */
      33             : 
      34             : #include "libavutil/common.h"
      35             : 
      36             : #include "avcodec.h"
      37             : #include "nellymoser.h"
      38             : 
      39             : const float ff_nelly_dequantization_table[127] = {
      40             :  0.0000000000,
      41             : 
      42             : -0.8472560048, 0.7224709988,
      43             : 
      44             : -1.5247479677,-0.4531480074, 0.3753609955, 1.4717899561,
      45             : 
      46             : -1.9822579622,-1.1929379702,-0.5829370022,-0.0693780035, 0.3909569979, 0.9069200158, 1.4862740040, 2.2215409279,
      47             : 
      48             : -2.3887870312,-1.8067539930,-1.4105420113,-1.0773609877,-0.7995010018,-0.5558109879,-0.3334020078,-0.1324490011,
      49             :  0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398, 1.3954459429, 1.8098750114, 2.3918759823,
      50             : 
      51             : -2.3893830776,-1.9884680510,-1.7514040470,-1.5643119812,-1.3922129869,-1.2164649963,-1.0469499826,-0.8905100226,
      52             : -0.7645580173,-0.6454579830,-0.5259280205,-0.4059549868,-0.3029719889,-0.2096900046,-0.1239869967,-0.0479229987,
      53             :  0.0257730000, 0.1001340002, 0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119,
      54             :  0.8425520062, 1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354,
      55             : 
      56             : -2.5756309032,-2.0573320389,-1.8984919786,-1.7727810144,-1.6662600040,-1.5742180347,-1.4993319511,-1.4316639900,
      57             : -1.3652280569,-1.3000990152,-1.2280930281,-1.1588579416,-1.0921250582,-1.0135740042,-0.9202849865,-0.8287050128,
      58             : -0.7374889851,-0.6447759867,-0.5590940118,-0.4857139885,-0.4110319912,-0.3459700048,-0.2851159871,-0.2341620028,
      59             : -0.1870580018,-0.1442500055,-0.1107169986,-0.0739680007,-0.0365610011,-0.0073290002, 0.0203610007, 0.0479039997,
      60             :  0.0751969963, 0.0980999991, 0.1220389977, 0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984,
      61             :  0.2870100141, 0.3197099864, 0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058,
      62             :  0.6122040153, 0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
      63             :  1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547, 2.2903931141
      64             : };
      65             : 
      66             : const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS] = {
      67             : 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
      68             : };
      69             : 
      70             : const uint16_t ff_nelly_init_table[64] = {
      71             : 3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770,
      72             : 12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824,
      73             : 16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078,
      74             : 19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453,
      75             : 22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
      76             : 26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
      77             : };
      78             : 
      79             : const int16_t ff_nelly_delta_table[32] = {
      80             : -11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596,
      81             : -2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433,
      82             : 2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
      83             : };
      84             : 
      85      399962 : static inline int signed_shift(int i, int shift) {
      86      399962 :     if (shift > 0)
      87       23619 :         return (unsigned)i << shift;
      88      376343 :     return i >> -shift;
      89             : }
      90             : 
      91       56205 : static int sum_bits(short *buf, short shift, short off)
      92             : {
      93       56205 :     int i, ret = 0;
      94             : 
      95     7025625 :     for (i = 0; i < NELLY_FILL_LEN; i++) {
      96     6969420 :         int b = buf[i]-off;
      97     6969420 :         b = ((b>>(shift-1))+1)>>1;
      98     6969420 :         ret += av_clip(b, 0, NELLY_BIT_CAP);
      99             :     }
     100             : 
     101       56205 :     return ret;
     102             : }
     103             : 
     104        6350 : static int headroom(int *la)
     105             : {
     106             :     int l;
     107        6350 :     if (*la == 0) {
     108           0 :         return 31;
     109             :     }
     110        6350 :     l = 30 - av_log2(FFABS(*la));
     111        6350 :     *la *= 1<<l;
     112        6350 :     return l;
     113             : }
     114             : 
     115             : 
     116        3175 : void ff_nelly_get_sample_bits(const float *buf, int *bits)
     117             : {
     118             :     int i, j;
     119             :     short sbuf[128];
     120        3175 :     int bitsum = 0, last_bitsum, small_bitsum, big_bitsum;
     121             :     short shift, shift_saved;
     122             :     int max, sum, last_off, tmp;
     123             :     int big_off, small_off;
     124             :     int off;
     125             : 
     126        3175 :     max = 0;
     127      396875 :     for (i = 0; i < NELLY_FILL_LEN; i++) {
     128      393700 :         max = FFMAX(max, buf[i]);
     129             :     }
     130        3175 :     shift = -16;
     131        3175 :     shift += headroom(&max);
     132             : 
     133        3175 :     sum = 0;
     134      396875 :     for (i = 0; i < NELLY_FILL_LEN; i++) {
     135      393700 :         sbuf[i] = signed_shift(buf[i], shift);
     136      393700 :         sbuf[i] = (3*sbuf[i])>>2;
     137      393700 :         sum += sbuf[i];
     138             :     }
     139             : 
     140        3175 :     shift += 11;
     141        3175 :     shift_saved = shift;
     142        3175 :     sum -= NELLY_DETAIL_BITS << shift;
     143        3175 :     shift += headroom(&sum);
     144        3175 :     small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15;
     145        3175 :     shift = shift_saved - (NELLY_BASE_SHIFT+shift-31);
     146             : 
     147        3175 :     small_off = signed_shift(small_off, shift);
     148             : 
     149        3175 :     bitsum = sum_bits(sbuf, shift_saved, small_off);
     150             : 
     151        3175 :     if (bitsum != NELLY_DETAIL_BITS) {
     152        3087 :         off = bitsum - NELLY_DETAIL_BITS;
     153             : 
     154       37387 :         for(shift=0; FFABS(off) <= 16383; shift++)
     155       34300 :             off *= 2;
     156             : 
     157        3087 :         off = (off * NELLY_BASE_OFF) >> 15;
     158        3087 :         shift = shift_saved-(NELLY_BASE_SHIFT+shift-15);
     159             : 
     160        3087 :         off = signed_shift(off, shift);
     161             : 
     162        7361 :         for (j = 1; j < 20; j++) {
     163        7347 :             last_off = small_off;
     164        7347 :             small_off += off;
     165        7347 :             last_bitsum = bitsum;
     166             : 
     167        7347 :             bitsum = sum_bits(sbuf, shift_saved, small_off);
     168             : 
     169        7347 :             if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0)
     170        3073 :                 break;
     171             :         }
     172             : 
     173        3087 :         if (bitsum > NELLY_DETAIL_BITS) {
     174        1166 :             big_off = small_off;
     175        1166 :             small_off = last_off;
     176        1166 :             big_bitsum=bitsum;
     177        1166 :             small_bitsum=last_bitsum;
     178             :         } else {
     179        1921 :             big_off = last_off;
     180        1921 :             big_bitsum=last_bitsum;
     181        1921 :             small_bitsum=bitsum;
     182             :         }
     183             : 
     184       51857 :         while (bitsum != NELLY_DETAIL_BITS && j <= 19) {
     185       45683 :             off = (big_off+small_off)>>1;
     186       45683 :             bitsum = sum_bits(sbuf, shift_saved, off);
     187       45683 :             if (bitsum > NELLY_DETAIL_BITS) {
     188       36145 :                 big_off=off;
     189       36145 :                 big_bitsum=bitsum;
     190             :             } else {
     191        9538 :                 small_off = off;
     192        9538 :                 small_bitsum=bitsum;
     193             :             }
     194       45683 :             j++;
     195             :         }
     196             : 
     197        6174 :         if (abs(big_bitsum-NELLY_DETAIL_BITS) >=
     198        3087 :             abs(small_bitsum-NELLY_DETAIL_BITS)) {
     199        2111 :             bitsum = small_bitsum;
     200             :         } else {
     201         976 :             small_off = big_off;
     202         976 :             bitsum = big_bitsum;
     203             :         }
     204             :     }
     205             : 
     206      396875 :     for (i = 0; i < NELLY_FILL_LEN; i++) {
     207      393700 :         tmp = sbuf[i]-small_off;
     208      393700 :         tmp = ((tmp>>(shift_saved-1))+1)>>1;
     209      393700 :         bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP);
     210             :     }
     211             : 
     212        3175 :     if (bitsum > NELLY_DETAIL_BITS) {
     213         985 :         tmp = i = 0;
     214       93122 :         while (tmp < NELLY_DETAIL_BITS) {
     215       91152 :             tmp += bits[i];
     216       91152 :             i++;
     217             :         }
     218             : 
     219         985 :         bits[i-1] -= tmp - NELLY_DETAIL_BITS;
     220       31973 :         for(; i < NELLY_FILL_LEN; i++)
     221       30988 :             bits[i] = 0;
     222             :     }
     223        3175 : }

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