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 libavcodec/nellymoser.c 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 "nellymoser.h" 35#include "libavutil/random.h" 36#include "avcodec.h" 37#include "dsputil.h" 38 39#define ALT_BITSTREAM_READER_LE 40#include "bitstream.h" 41 42const float ff_nelly_dequantization_table[127] = { 43 0.0000000000, 44 45-0.8472560048, 0.7224709988, 46 47-1.5247479677,-0.4531480074, 0.3753609955, 1.4717899561, 48 49-1.9822579622,-1.1929379702,-0.5829370022,-0.0693780035, 0.3909569979, 0.9069200158, 1.4862740040, 2.2215409279, 50 51-2.3887870312,-1.8067539930,-1.4105420113,-1.0773609877,-0.7995010018,-0.5558109879,-0.3334020078,-0.1324490011, 52 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398, 1.3954459429, 1.8098750114, 2.3918759823, 53 54-2.3893830776,-1.9884680510,-1.7514040470,-1.5643119812,-1.3922129869,-1.2164649963,-1.0469499826,-0.8905100226, 55-0.7645580173,-0.6454579830,-0.5259280205,-0.4059549868,-0.3029719889,-0.2096900046,-0.1239869967,-0.0479229987, 56 0.0257730000, 0.1001340002, 0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 57 0.8425520062, 1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354, 58 59-2.5756309032,-2.0573320389,-1.8984919786,-1.7727810144,-1.6662600040,-1.5742180347,-1.4993319511,-1.4316639900, 60-1.3652280569,-1.3000990152,-1.2280930281,-1.1588579416,-1.0921250582,-1.0135740042,-0.9202849865,-0.8287050128, 61-0.7374889851,-0.6447759867,-0.5590940118,-0.4857139885,-0.4110319912,-0.3459700048,-0.2851159871,-0.2341620028, 62-0.1870580018,-0.1442500055,-0.1107169986,-0.0739680007,-0.0365610011,-0.0073290002, 0.0203610007, 0.0479039997, 63 0.0751969963, 0.0980999991, 0.1220389977, 0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 64 0.2870100141, 0.3197099864, 0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 65 0.6122040153, 0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075, 66 1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547, 2.2903931141 67}; 68 69const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS] = { 702, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15 71}; 72 73const uint16_t ff_nelly_init_table[64] = { 743134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770, 7512116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824, 7616157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078, 7719381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453, 7822756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730, 7926120, 26497, 26895, 27344, 27877, 28463, 29426, 31355 80}; 81 82const int16_t ff_nelly_delta_table[32] = { 83-11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596, 84-2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433, 852968, 3569, 4314, 5279, 6622, 8154, 10076, 12975 86}; 87 88static inline int signed_shift(int i, int shift) { 89 if (shift > 0) 90 return i << shift; 91 return i >> -shift; 92} 93 94static int sum_bits(short *buf, short shift, short off) 95{ 96 int i, ret = 0; 97 98 for (i = 0; i < NELLY_FILL_LEN; i++) { 99 int b = buf[i]-off; 100 b = ((b>>(shift-1))+1)>>1; 101 ret += av_clip(b, 0, NELLY_BIT_CAP); 102 } 103 104 return ret; 105} 106 107static int headroom(int *la) 108{ 109 int l; 110 if (*la == 0) { 111 return 31; 112 } 113 l = 30 - av_log2(FFABS(*la)); 114 *la <<= l; 115 return l; 116} 117 118 119void ff_nelly_get_sample_bits(const float *buf, int *bits) 120{ 121 int i, j; 122 short sbuf[128]; 123 int bitsum = 0, last_bitsum, small_bitsum, big_bitsum; 124 short shift, shift_saved; 125 int max, sum, last_off, tmp; 126 int big_off, small_off; 127 int off; 128 129 max = 0; 130 for (i = 0; i < NELLY_FILL_LEN; i++) { 131 max = FFMAX(max, buf[i]); 132 } 133 shift = -16; 134 shift += headroom(&max); 135 136 sum = 0; 137 for (i = 0; i < NELLY_FILL_LEN; i++) { 138 sbuf[i] = signed_shift(buf[i], shift); 139 sbuf[i] = (3*sbuf[i])>>2; 140 sum += sbuf[i]; 141 } 142 143 shift += 11; 144 shift_saved = shift; 145 sum -= NELLY_DETAIL_BITS << shift; 146 shift += headroom(&sum); 147 small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15; 148 shift = shift_saved - (NELLY_BASE_SHIFT+shift-31); 149 150 small_off = signed_shift(small_off, shift); 151 152 bitsum = sum_bits(sbuf, shift_saved, small_off); 153 154 if (bitsum != NELLY_DETAIL_BITS) { 155 off = bitsum - NELLY_DETAIL_BITS; 156 157 for(shift=0; FFABS(off) <= 16383; shift++) 158 off *= 2; 159 160 off = (off * NELLY_BASE_OFF) >> 15; 161 shift = shift_saved-(NELLY_BASE_SHIFT+shift-15); 162 163 off = signed_shift(off, shift); 164 165 for (j = 1; j < 20; j++) { 166 last_off = small_off; 167 small_off += off; 168 last_bitsum = bitsum; 169 170 bitsum = sum_bits(sbuf, shift_saved, small_off); 171 172 if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0) 173 break; 174 } 175 176 if (bitsum > NELLY_DETAIL_BITS) { 177 big_off = small_off; 178 small_off = last_off; 179 big_bitsum=bitsum; 180 small_bitsum=last_bitsum; 181 } else { 182 big_off = last_off; 183 big_bitsum=last_bitsum; 184 small_bitsum=bitsum; 185 } 186 187 while (bitsum != NELLY_DETAIL_BITS && j <= 19) { 188 off = (big_off+small_off)>>1; 189 bitsum = sum_bits(sbuf, shift_saved, off); 190 if (bitsum > NELLY_DETAIL_BITS) { 191 big_off=off; 192 big_bitsum=bitsum; 193 } else { 194 small_off = off; 195 small_bitsum=bitsum; 196 } 197 j++; 198 } 199 200 if (abs(big_bitsum-NELLY_DETAIL_BITS) >= 201 abs(small_bitsum-NELLY_DETAIL_BITS)) { 202 bitsum = small_bitsum; 203 } else { 204 small_off = big_off; 205 bitsum = big_bitsum; 206 } 207 } 208 209 for (i = 0; i < NELLY_FILL_LEN; i++) { 210 tmp = sbuf[i]-small_off; 211 tmp = ((tmp>>(shift_saved-1))+1)>>1; 212 bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP); 213 } 214 215 if (bitsum > NELLY_DETAIL_BITS) { 216 tmp = i = 0; 217 while (tmp < NELLY_DETAIL_BITS) { 218 tmp += bits[i]; 219 i++; 220 } 221 222 bits[i-1] -= tmp - NELLY_DETAIL_BITS; 223 for(; i < NELLY_FILL_LEN; i++) 224 bits[i] = 0; 225 } 226} 227 228