blob: 027726e0ba657b44662066ce849a38f6ebfa18ee
| 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 | static inline int signed_shift(int i, int shift) { |
| 86 | if (shift > 0) |
| 87 | return i << shift; |
| 88 | return i >> -shift; |
| 89 | } |
| 90 | |
| 91 | static int sum_bits(short *buf, short shift, short off) |
| 92 | { |
| 93 | int i, ret = 0; |
| 94 | |
| 95 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 96 | int b = buf[i]-off; |
| 97 | b = ((b>>(shift-1))+1)>>1; |
| 98 | ret += av_clip(b, 0, NELLY_BIT_CAP); |
| 99 | } |
| 100 | |
| 101 | return ret; |
| 102 | } |
| 103 | |
| 104 | static int headroom(int *la) |
| 105 | { |
| 106 | int l; |
| 107 | if (*la == 0) { |
| 108 | return 31; |
| 109 | } |
| 110 | l = 30 - av_log2(FFABS(*la)); |
| 111 | *la <<= l; |
| 112 | return l; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | void ff_nelly_get_sample_bits(const float *buf, int *bits) |
| 117 | { |
| 118 | int i, j; |
| 119 | short sbuf[128]; |
| 120 | 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 | max = 0; |
| 127 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 128 | max = FFMAX(max, buf[i]); |
| 129 | } |
| 130 | shift = -16; |
| 131 | shift += headroom(&max); |
| 132 | |
| 133 | sum = 0; |
| 134 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 135 | sbuf[i] = signed_shift(buf[i], shift); |
| 136 | sbuf[i] = (3*sbuf[i])>>2; |
| 137 | sum += sbuf[i]; |
| 138 | } |
| 139 | |
| 140 | shift += 11; |
| 141 | shift_saved = shift; |
| 142 | sum -= NELLY_DETAIL_BITS << shift; |
| 143 | shift += headroom(&sum); |
| 144 | small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15; |
| 145 | shift = shift_saved - (NELLY_BASE_SHIFT+shift-31); |
| 146 | |
| 147 | small_off = signed_shift(small_off, shift); |
| 148 | |
| 149 | bitsum = sum_bits(sbuf, shift_saved, small_off); |
| 150 | |
| 151 | if (bitsum != NELLY_DETAIL_BITS) { |
| 152 | off = bitsum - NELLY_DETAIL_BITS; |
| 153 | |
| 154 | for(shift=0; FFABS(off) <= 16383; shift++) |
| 155 | off *= 2; |
| 156 | |
| 157 | off = (off * NELLY_BASE_OFF) >> 15; |
| 158 | shift = shift_saved-(NELLY_BASE_SHIFT+shift-15); |
| 159 | |
| 160 | off = signed_shift(off, shift); |
| 161 | |
| 162 | for (j = 1; j < 20; j++) { |
| 163 | last_off = small_off; |
| 164 | small_off += off; |
| 165 | last_bitsum = bitsum; |
| 166 | |
| 167 | bitsum = sum_bits(sbuf, shift_saved, small_off); |
| 168 | |
| 169 | if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0) |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | if (bitsum > NELLY_DETAIL_BITS) { |
| 174 | big_off = small_off; |
| 175 | small_off = last_off; |
| 176 | big_bitsum=bitsum; |
| 177 | small_bitsum=last_bitsum; |
| 178 | } else { |
| 179 | big_off = last_off; |
| 180 | big_bitsum=last_bitsum; |
| 181 | small_bitsum=bitsum; |
| 182 | } |
| 183 | |
| 184 | while (bitsum != NELLY_DETAIL_BITS && j <= 19) { |
| 185 | off = (big_off+small_off)>>1; |
| 186 | bitsum = sum_bits(sbuf, shift_saved, off); |
| 187 | if (bitsum > NELLY_DETAIL_BITS) { |
| 188 | big_off=off; |
| 189 | big_bitsum=bitsum; |
| 190 | } else { |
| 191 | small_off = off; |
| 192 | small_bitsum=bitsum; |
| 193 | } |
| 194 | j++; |
| 195 | } |
| 196 | |
| 197 | if (abs(big_bitsum-NELLY_DETAIL_BITS) >= |
| 198 | abs(small_bitsum-NELLY_DETAIL_BITS)) { |
| 199 | bitsum = small_bitsum; |
| 200 | } else { |
| 201 | small_off = big_off; |
| 202 | bitsum = big_bitsum; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 207 | tmp = sbuf[i]-small_off; |
| 208 | tmp = ((tmp>>(shift_saved-1))+1)>>1; |
| 209 | bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP); |
| 210 | } |
| 211 | |
| 212 | if (bitsum > NELLY_DETAIL_BITS) { |
| 213 | tmp = i = 0; |
| 214 | while (tmp < NELLY_DETAIL_BITS) { |
| 215 | tmp += bits[i]; |
| 216 | i++; |
| 217 | } |
| 218 | |
| 219 | bits[i-1] -= tmp - NELLY_DETAIL_BITS; |
| 220 | for(; i < NELLY_FILL_LEN; i++) |
| 221 | bits[i] = 0; |
| 222 | } |
| 223 | } |
| 224 |