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224 lines
7.7 KiB
224 lines
7.7 KiB
/* |
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* Common code between Nellymoser encoder and decoder |
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* Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5, |
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* 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and |
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* 520e17cd55896441042b14df2566a6eb610ed444 |
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* Copyright (c) 2007 Loic Minier <lool at dooz.org> |
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* Benjamin Larsson |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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*/ |
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/** |
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* @file |
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* The 3 alphanumeric copyright notices are md5summed they are from the original |
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* implementors. The original code is available from http://code.google.com/p/nelly2pcm/ |
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*/ |
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#include "nellymoser.h" |
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#include "avcodec.h" |
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#define BITSTREAM_READER_LE |
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#include "get_bits.h" |
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const float ff_nelly_dequantization_table[127] = { |
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0.0000000000, |
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-0.8472560048, 0.7224709988, |
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-1.5247479677,-0.4531480074, 0.3753609955, 1.4717899561, |
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-1.9822579622,-1.1929379702,-0.5829370022,-0.0693780035, 0.3909569979, 0.9069200158, 1.4862740040, 2.2215409279, |
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-2.3887870312,-1.8067539930,-1.4105420113,-1.0773609877,-0.7995010018,-0.5558109879,-0.3334020078,-0.1324490011, |
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0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398, 1.3954459429, 1.8098750114, 2.3918759823, |
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-2.3893830776,-1.9884680510,-1.7514040470,-1.5643119812,-1.3922129869,-1.2164649963,-1.0469499826,-0.8905100226, |
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-0.7645580173,-0.6454579830,-0.5259280205,-0.4059549868,-0.3029719889,-0.2096900046,-0.1239869967,-0.0479229987, |
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0.0257730000, 0.1001340002, 0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, |
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0.8425520062, 1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354, |
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-2.5756309032,-2.0573320389,-1.8984919786,-1.7727810144,-1.6662600040,-1.5742180347,-1.4993319511,-1.4316639900, |
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-1.3652280569,-1.3000990152,-1.2280930281,-1.1588579416,-1.0921250582,-1.0135740042,-0.9202849865,-0.8287050128, |
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-0.7374889851,-0.6447759867,-0.5590940118,-0.4857139885,-0.4110319912,-0.3459700048,-0.2851159871,-0.2341620028, |
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-0.1870580018,-0.1442500055,-0.1107169986,-0.0739680007,-0.0365610011,-0.0073290002, 0.0203610007, 0.0479039997, |
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0.0751969963, 0.0980999991, 0.1220389977, 0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, |
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0.2870100141, 0.3197099864, 0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, |
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0.6122040153, 0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075, |
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1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547, 2.2903931141 |
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}; |
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const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS] = { |
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2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15 |
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}; |
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const uint16_t ff_nelly_init_table[64] = { |
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3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770, |
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12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824, |
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16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078, |
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19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453, |
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22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730, |
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26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355 |
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}; |
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const int16_t ff_nelly_delta_table[32] = { |
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-11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596, |
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-2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433, |
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2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975 |
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}; |
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static inline int signed_shift(int i, int shift) { |
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if (shift > 0) |
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return i << shift; |
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return i >> -shift; |
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} |
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static int sum_bits(short *buf, short shift, short off) |
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{ |
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int i, ret = 0; |
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for (i = 0; i < NELLY_FILL_LEN; i++) { |
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int b = buf[i]-off; |
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b = ((b>>(shift-1))+1)>>1; |
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ret += av_clip(b, 0, NELLY_BIT_CAP); |
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} |
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return ret; |
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} |
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static int headroom(int *la) |
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{ |
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int l; |
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if (*la == 0) { |
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return 31; |
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} |
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l = 30 - av_log2(FFABS(*la)); |
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*la <<= l; |
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return l; |
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} |
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void ff_nelly_get_sample_bits(const float *buf, int *bits) |
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{ |
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int i, j; |
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short sbuf[128]; |
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int bitsum = 0, last_bitsum, small_bitsum, big_bitsum; |
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short shift, shift_saved; |
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int max, sum, last_off, tmp; |
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int big_off, small_off; |
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int off; |
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max = 0; |
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for (i = 0; i < NELLY_FILL_LEN; i++) { |
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max = FFMAX(max, buf[i]); |
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} |
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shift = -16; |
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shift += headroom(&max); |
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sum = 0; |
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for (i = 0; i < NELLY_FILL_LEN; i++) { |
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sbuf[i] = signed_shift(buf[i], shift); |
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sbuf[i] = (3*sbuf[i])>>2; |
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sum += sbuf[i]; |
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} |
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shift += 11; |
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shift_saved = shift; |
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sum -= NELLY_DETAIL_BITS << shift; |
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shift += headroom(&sum); |
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small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15; |
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shift = shift_saved - (NELLY_BASE_SHIFT+shift-31); |
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small_off = signed_shift(small_off, shift); |
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bitsum = sum_bits(sbuf, shift_saved, small_off); |
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if (bitsum != NELLY_DETAIL_BITS) { |
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off = bitsum - NELLY_DETAIL_BITS; |
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for(shift=0; FFABS(off) <= 16383; shift++) |
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off *= 2; |
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off = (off * NELLY_BASE_OFF) >> 15; |
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shift = shift_saved-(NELLY_BASE_SHIFT+shift-15); |
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off = signed_shift(off, shift); |
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for (j = 1; j < 20; j++) { |
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last_off = small_off; |
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small_off += off; |
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last_bitsum = bitsum; |
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bitsum = sum_bits(sbuf, shift_saved, small_off); |
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if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0) |
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break; |
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} |
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if (bitsum > NELLY_DETAIL_BITS) { |
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big_off = small_off; |
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small_off = last_off; |
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big_bitsum=bitsum; |
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small_bitsum=last_bitsum; |
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} else { |
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big_off = last_off; |
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big_bitsum=last_bitsum; |
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small_bitsum=bitsum; |
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} |
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while (bitsum != NELLY_DETAIL_BITS && j <= 19) { |
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off = (big_off+small_off)>>1; |
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bitsum = sum_bits(sbuf, shift_saved, off); |
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if (bitsum > NELLY_DETAIL_BITS) { |
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big_off=off; |
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big_bitsum=bitsum; |
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} else { |
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small_off = off; |
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small_bitsum=bitsum; |
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} |
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j++; |
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} |
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if (abs(big_bitsum-NELLY_DETAIL_BITS) >= |
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abs(small_bitsum-NELLY_DETAIL_BITS)) { |
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bitsum = small_bitsum; |
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} else { |
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small_off = big_off; |
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bitsum = big_bitsum; |
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} |
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} |
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for (i = 0; i < NELLY_FILL_LEN; i++) { |
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tmp = sbuf[i]-small_off; |
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tmp = ((tmp>>(shift_saved-1))+1)>>1; |
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bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP); |
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} |
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if (bitsum > NELLY_DETAIL_BITS) { |
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tmp = i = 0; |
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while (tmp < NELLY_DETAIL_BITS) { |
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tmp += bits[i]; |
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i++; |
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} |
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bits[i-1] -= tmp - NELLY_DETAIL_BITS; |
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for(; i < NELLY_FILL_LEN; i++) |
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bits[i] = 0; |
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} |
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}
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