| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 <stdlib.h> | ||
| 35 | |||
| 36 | #include "libavutil/intmath.h" | ||
| 37 | #include "libavutil/common.h" | ||
| 38 | |||
| 39 | #include "nellymoser.h" | ||
| 40 | |||
| 41 | const float ff_nelly_dequantization_table[127] = { | ||
| 42 | 0.0000000000, | ||
| 43 | |||
| 44 | -0.8472560048, 0.7224709988, | ||
| 45 | |||
| 46 | -1.5247479677,-0.4531480074, 0.3753609955, 1.4717899561, | ||
| 47 | |||
| 48 | -1.9822579622,-1.1929379702,-0.5829370022,-0.0693780035, 0.3909569979, 0.9069200158, 1.4862740040, 2.2215409279, | ||
| 49 | |||
| 50 | -2.3887870312,-1.8067539930,-1.4105420113,-1.0773609877,-0.7995010018,-0.5558109879,-0.3334020078,-0.1324490011, | ||
| 51 | 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398, 1.3954459429, 1.8098750114, 2.3918759823, | ||
| 52 | |||
| 53 | -2.3893830776,-1.9884680510,-1.7514040470,-1.5643119812,-1.3922129869,-1.2164649963,-1.0469499826,-0.8905100226, | ||
| 54 | -0.7645580173,-0.6454579830,-0.5259280205,-0.4059549868,-0.3029719889,-0.2096900046,-0.1239869967,-0.0479229987, | ||
| 55 | 0.0257730000, 0.1001340002, 0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, | ||
| 56 | 0.8425520062, 1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354, | ||
| 57 | |||
| 58 | -2.5756309032,-2.0573320389,-1.8984919786,-1.7727810144,-1.6662600040,-1.5742180347,-1.4993319511,-1.4316639900, | ||
| 59 | -1.3652280569,-1.3000990152,-1.2280930281,-1.1588579416,-1.0921250582,-1.0135740042,-0.9202849865,-0.8287050128, | ||
| 60 | -0.7374889851,-0.6447759867,-0.5590940118,-0.4857139885,-0.4110319912,-0.3459700048,-0.2851159871,-0.2341620028, | ||
| 61 | -0.1870580018,-0.1442500055,-0.1107169986,-0.0739680007,-0.0365610011,-0.0073290002, 0.0203610007, 0.0479039997, | ||
| 62 | 0.0751969963, 0.0980999991, 0.1220389977, 0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, | ||
| 63 | 0.2870100141, 0.3197099864, 0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, | ||
| 64 | 0.6122040153, 0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075, | ||
| 65 | 1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547, 2.2903931141 | ||
| 66 | }; | ||
| 67 | |||
| 68 | const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS] = { | ||
| 69 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15 | ||
| 70 | }; | ||
| 71 | |||
| 72 | const uint16_t ff_nelly_init_table[64] = { | ||
| 73 | 3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770, | ||
| 74 | 12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824, | ||
| 75 | 16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078, | ||
| 76 | 19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453, | ||
| 77 | 22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730, | ||
| 78 | 26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355 | ||
| 79 | }; | ||
| 80 | |||
| 81 | const int16_t ff_nelly_delta_table[32] = { | ||
| 82 | -11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596, | ||
| 83 | -2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433, | ||
| 84 | 2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975 | ||
| 85 | }; | ||
| 86 | |||
| 87 | 400718 | static inline int signed_shift(int i, int shift) { | |
| 88 |
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400718 | if (shift > 0) |
| 89 | 23748 | return (unsigned)i << shift; | |
| 90 | 376970 | return i >> -shift; | |
| 91 | } | ||
| 92 | |||
| 93 | 56313 | static int sum_bits(short *buf, short shift, short off) | |
| 94 | { | ||
| 95 | 56313 | int i, ret = 0; | |
| 96 | |||
| 97 |
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7039125 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 98 | 6982812 | int b = buf[i]-off; | |
| 99 | 6982812 | b = ((b>>(shift-1))+1)>>1; | |
| 100 | 6982812 | ret += av_clip(b, 0, NELLY_BIT_CAP); | |
| 101 | } | ||
| 102 | |||
| 103 | 56313 | return ret; | |
| 104 | } | ||
| 105 | |||
| 106 | 6362 | static int headroom(int *la) | |
| 107 | { | ||
| 108 | int l; | ||
| 109 |
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6362 | if (*la == 0) { |
| 110 | ✗ | return 31; | |
| 111 | } | ||
| 112 | 6362 | l = 30 - av_log2(FFABS(*la)); | |
| 113 | 6362 | *la *= 1<<l; | |
| 114 | 6362 | return l; | |
| 115 | } | ||
| 116 | |||
| 117 | |||
| 118 | 3181 | void ff_nelly_get_sample_bits(const float *buf, int *bits) | |
| 119 | { | ||
| 120 | int i, j; | ||
| 121 | short sbuf[128]; | ||
| 122 | 3181 | int bitsum = 0, last_bitsum, small_bitsum, big_bitsum; | |
| 123 | short shift, shift_saved; | ||
| 124 | int max, sum, last_off, tmp; | ||
| 125 | int big_off, small_off; | ||
| 126 | int off; | ||
| 127 | |||
| 128 | 3181 | max = 0; | |
| 129 |
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397625 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 130 |
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394444 | max = FFMAX(max, buf[i]); |
| 131 | } | ||
| 132 | 3181 | shift = -16; | |
| 133 | 3181 | shift += headroom(&max); | |
| 134 | |||
| 135 | 3181 | sum = 0; | |
| 136 |
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397625 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 137 | 394444 | sbuf[i] = signed_shift(buf[i], shift); | |
| 138 | 394444 | sbuf[i] = (3*sbuf[i])>>2; | |
| 139 | 394444 | sum += sbuf[i]; | |
| 140 | } | ||
| 141 | |||
| 142 | 3181 | shift += 11; | |
| 143 | 3181 | shift_saved = shift; | |
| 144 | 3181 | sum -= NELLY_DETAIL_BITS << shift; | |
| 145 | 3181 | shift += headroom(&sum); | |
| 146 | 3181 | small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15; | |
| 147 | 3181 | shift = shift_saved - (NELLY_BASE_SHIFT+shift-31); | |
| 148 | |||
| 149 | 3181 | small_off = signed_shift(small_off, shift); | |
| 150 | |||
| 151 | 3181 | bitsum = sum_bits(sbuf, shift_saved, small_off); | |
| 152 | |||
| 153 |
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3181 | if (bitsum != NELLY_DETAIL_BITS) { |
| 154 | 3093 | off = bitsum - NELLY_DETAIL_BITS; | |
| 155 | |||
| 156 |
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37463 | for(shift=0; FFABS(off) <= 16383; shift++) |
| 157 | 34370 | off *= 2; | |
| 158 | |||
| 159 | 3093 | off = (off * NELLY_BASE_OFF) >> 15; | |
| 160 | 3093 | shift = shift_saved-(NELLY_BASE_SHIFT+shift-15); | |
| 161 | |||
| 162 | 3093 | off = signed_shift(off, shift); | |
| 163 | |||
| 164 |
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7375 | for (j = 1; j < 20; j++) { |
| 165 | 7361 | last_off = small_off; | |
| 166 | 7361 | small_off += off; | |
| 167 | 7361 | last_bitsum = bitsum; | |
| 168 | |||
| 169 | 7361 | bitsum = sum_bits(sbuf, shift_saved, small_off); | |
| 170 | |||
| 171 |
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7361 | if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0) |
| 172 | 3079 | break; | |
| 173 | } | ||
| 174 | |||
| 175 |
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3093 | if (bitsum > NELLY_DETAIL_BITS) { |
| 176 | 1169 | big_off = small_off; | |
| 177 | 1169 | small_off = last_off; | |
| 178 | 1169 | big_bitsum=bitsum; | |
| 179 | 1169 | small_bitsum=last_bitsum; | |
| 180 | } else { | ||
| 181 | 1924 | big_off = last_off; | |
| 182 | 1924 | big_bitsum=last_bitsum; | |
| 183 | 1924 | small_bitsum=bitsum; | |
| 184 | } | ||
| 185 | |||
| 186 |
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48864 | while (bitsum != NELLY_DETAIL_BITS && j <= 19) { |
| 187 | 45771 | off = (big_off+small_off)>>1; | |
| 188 | 45771 | bitsum = sum_bits(sbuf, shift_saved, off); | |
| 189 |
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45771 | if (bitsum > NELLY_DETAIL_BITS) { |
| 190 | 36216 | big_off=off; | |
| 191 | 36216 | big_bitsum=bitsum; | |
| 192 | } else { | ||
| 193 | 9555 | small_off = off; | |
| 194 | 9555 | small_bitsum=bitsum; | |
| 195 | } | ||
| 196 | 45771 | j++; | |
| 197 | } | ||
| 198 | |||
| 199 | 3093 | if (abs(big_bitsum-NELLY_DETAIL_BITS) >= | |
| 200 |
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3093 | abs(small_bitsum-NELLY_DETAIL_BITS)) { |
| 201 | 2115 | bitsum = small_bitsum; | |
| 202 | } else { | ||
| 203 | 978 | small_off = big_off; | |
| 204 | 978 | bitsum = big_bitsum; | |
| 205 | } | ||
| 206 | } | ||
| 207 | |||
| 208 |
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397625 | for (i = 0; i < NELLY_FILL_LEN; i++) { |
| 209 | 394444 | tmp = sbuf[i]-small_off; | |
| 210 | 394444 | tmp = ((tmp>>(shift_saved-1))+1)>>1; | |
| 211 | 394444 | bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP); | |
| 212 | } | ||
| 213 | |||
| 214 |
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3181 | if (bitsum > NELLY_DETAIL_BITS) { |
| 215 | 987 | tmp = i = 0; | |
| 216 |
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92325 | while (tmp < NELLY_DETAIL_BITS) { |
| 217 | 91338 | tmp += bits[i]; | |
| 218 | 91338 | i++; | |
| 219 | } | ||
| 220 | |||
| 221 | 987 | bits[i-1] -= tmp - NELLY_DETAIL_BITS; | |
| 222 |
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32037 | for(; i < NELLY_FILL_LEN; i++) |
| 223 | 31050 | bits[i] = 0; | |
| 224 | } | ||
| 225 | 3181 | } | |
| 226 |