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