mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 10741 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Benjamin Larsson
17 years ago
parent
85aec3bd48
commit
636b13c5fc
7 changed files with 490 additions and 2 deletions
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/*
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* NellyMoser audio 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 nellymoserdec.c |
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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 "avcodec.h" |
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#include "random.h" |
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#include "dsputil.h" |
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#define ALT_BITSTREAM_READER_LE |
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#include "bitstream.h" |
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#define NELLY_BANDS 23 |
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#define NELLY_BLOCK_LEN 64 |
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#define NELLY_HEADER_BITS 116 |
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#define NELLY_DETAIL_BITS 198 |
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#define NELLY_BUF_LEN 128 |
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#define NELLY_FILL_LEN 124 |
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#define NELLY_BIT_CAP 6 |
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#define NELLY_BASE_OFF 4228 |
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#define NELLY_BASE_SHIFT 19 |
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#define NELLY_SAMPLES 256 |
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static const float dequantization_table[127] = { |
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0.0000000000,-0.8472560048, 0.7224709988, -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, |
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2.2215409279, -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877, -0.7995010018,-0.5558109879, |
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-0.3334020078, -0.1324490011, 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398, |
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1.3954459429, 1.8098750114, 2.3918759823,-2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812, |
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-1.3922129869,-1.2164649963, -1.0469499826, -0.8905100226, -0.7645580173, -0.6454579830, -0.5259280205, |
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-0.4059549868, -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987, 0.0257730000, 0.1001340002, |
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0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 0.8425520062, |
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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, |
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-1.4316639900, -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416, -1.0921250582, -1.0135740042, |
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-0.9202849865, -0.8287050128, -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885, -0.4110319912, |
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-0.3459700048, -0.2851159871, -0.2341620028, -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007, |
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-0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997, 0.0751969963, 0.0980999991, 0.1220389977, |
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0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 0.2870100141, 0.3197099864, |
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0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 0.6122040153, |
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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, |
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2.2903931141 |
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}; |
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static const uint8_t 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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static const uint16_t 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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static const int16_t 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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typedef struct NellyMoserDecodeContext { |
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AVCodecContext* avctx; |
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float float_buf[NELLY_SAMPLES]; |
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float state[64]; |
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AVRandomState random_state; |
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GetBitContext gb; |
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int add_bias; |
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int scale_bias; |
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DSPContext dsp; |
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FFTContext fftc; |
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} NellyMoserDecodeContext; |
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DECLARE_ALIGNED_16(float,sine_window[128]); |
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DECLARE_ALIGNED_16(float,tcos[64]); |
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DECLARE_ALIGNED_16(float,tsin[64]); |
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DECLARE_ALIGNED_16(float,cos_tab[64]); |
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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 void antialias(float *buf, float *audio) |
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{ |
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int i, end, mid_hi, mid_lo; |
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end = NELLY_BUF_LEN-1; |
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mid_hi = NELLY_BUF_LEN/2; |
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mid_lo = mid_hi-1; |
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for (i = 0; i < NELLY_BUF_LEN/4; i++) { |
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audio[2*i] = buf[2*i ]*tcos[i ] - buf[end-2*i]*tsin[i]; |
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audio[2*i+1] = -(buf[end-2*i ]*tcos[i ] + buf[2*i ]*tsin[i]); |
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audio[end-2*i-1]= buf[end-2*i-1]*tcos[mid_lo-i] - buf[2*i+1 ]*tsin[mid_lo-i]; |
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audio[end-2*i ]= -(buf[2*i+1 ]*tcos[mid_lo-i] + buf[end-2*i]*tsin[mid_lo-i]); |
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} |
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} |
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static void complex2signal(float *audio) |
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{ |
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int i, end, mid_hi, mid_lo; |
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float *aptr, *sigptr, a, b, c, d, e, f, g; |
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end = NELLY_BUF_LEN-1; |
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mid_hi = NELLY_BUF_LEN/2; |
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mid_lo = mid_hi-1; |
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a = -audio[end]; |
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b = audio[end-1]; |
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c = -audio[1]; |
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d = cos_tab[0]; |
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e = audio[0]; |
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f = cos_tab[mid_lo]; |
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g = cos_tab[1]; |
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audio[0] = d*e; |
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audio[1] = b*g-a*f; |
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audio[end-1] = a*g+b*f; |
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audio[end] = c*(-d); |
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aptr = audio+end-2; |
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sigptr = cos_tab+mid_hi-1; |
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for (i = 3; i < NELLY_BUF_LEN/2; i += 2) { |
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a = audio[i-1]; |
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b = -audio[i]; |
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c = cos_tab[i/2]; |
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d = *sigptr; |
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e = *(aptr-1); |
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f = -(*aptr); |
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audio[i-1] = a*c+b*d; |
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*aptr = a*d-b*c; |
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a = cos_tab[(i/2)+1]; |
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b = *(sigptr-1); |
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*(aptr-1) = b*e+a*f; |
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audio[i] = a*e-b*f; |
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sigptr--; |
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aptr -= 2; |
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} |
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} |
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static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio) |
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{ |
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int bot, mid_up, mid_down, top; |
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float s_bot, s_top; |
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bot = 0; |
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top = NELLY_BUF_LEN-1; |
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mid_up = NELLY_BUF_LEN/2; |
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mid_down = (NELLY_BUF_LEN/2)-1; |
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while (bot < NELLY_BUF_LEN/4) { |
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s_bot = audio[bot]; |
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s_top = audio[top]; |
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audio[bot] = (audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias; |
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audio[top] = (-state[bot ]*sine_window[bot]-audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias; |
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state[bot] = audio[mid_down]; |
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audio[mid_down] = (s_top *sine_window[mid_down]-state[mid_down]*sine_window[mid_up])/s->scale_bias + s->add_bias; |
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audio[mid_up ] = (-state[mid_down]*sine_window[mid_down]-s_top *sine_window[mid_up])/s->scale_bias + s->add_bias; |
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state[mid_down] = s_bot; |
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bot++; |
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mid_up++; |
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mid_down--; |
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top--; |
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} |
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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 b, i = 0, ret = 0; |
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for (i = 0; i < NELLY_FILL_LEN; i++) { |
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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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static void get_sample_bits(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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shift = 0; |
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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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void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES]) |
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{ |
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int i,j; |
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float buf[NELLY_BUF_LEN], pows[NELLY_BUF_LEN]; |
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float *aptr, *bptr, *pptr, val, pval; |
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int bits[NELLY_BUF_LEN]; |
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unsigned char v; |
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init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8); |
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bptr = buf; |
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pptr = pows; |
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val = nelly_init_table[get_bits(&s->gb, 6)]; |
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for (i=0 ; i<NELLY_BANDS ; i++) { |
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if (i > 0) |
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val += nelly_delta_table[get_bits(&s->gb, 5)]; |
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pval = pow(2, val/2048); |
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for (j = 0; j < nelly_band_sizes_table[i]; j++) { |
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*bptr++ = val; |
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*pptr++ = pval; |
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} |
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} |
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memset(&buf[NELLY_FILL_LEN],0,4*sizeof(float)); |
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memset(&pows[NELLY_FILL_LEN],0,4*sizeof(float)); |
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get_sample_bits(buf, bits); |
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for (i = 0; i < 2; i++) { |
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aptr = audio+i*128; |
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init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8); |
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skip_bits(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS); |
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for (j = 0; j < NELLY_FILL_LEN; j++) { |
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if (bits[j] <= 0) { |
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buf[j] = M_SQRT1_2*pows[j]; |
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if (av_random(&s->random_state) & 1) |
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buf[j] *= -1.0; |
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} else { |
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v = get_bits(&s->gb, bits[j]); |
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buf[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j]; |
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} |
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} |
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antialias(buf, aptr); |
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ff_fft_permute(&s->fftc, (FFTComplex*)aptr); |
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ff_fft_calc(&s->fftc, (FFTComplex*)aptr); |
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complex2signal(aptr); |
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overlap_and_window(s, s->state, aptr); |
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} |
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} |
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static int decode_init(AVCodecContext * avctx) { |
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NellyMoserDecodeContext *s = avctx->priv_data; |
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int i; |
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float alpha; |
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s->avctx = avctx; |
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av_init_random(0, &s->random_state); |
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ff_fft_init(&s->fftc, 6, 1); |
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dsputil_init(&s->dsp, avctx); |
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if(s->dsp.float_to_int16 == ff_float_to_int16_c) { |
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s->add_bias = 385; |
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s->scale_bias = 32768; |
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} else { |
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s->add_bias = 0; |
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s->scale_bias = 1; |
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} |
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/* Generate overlap window */ |
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if (!sine_window[0]) |
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for (i=0 ; i<128; i++) { |
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sine_window[i] = sin((i + 0.5) / 256.0 * M_PI); |
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} |
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/* Generate tables */ |
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if (!tcos[0]) |
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for(i=0;i<64;i++) { |
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alpha = 2*M_PI * (i + 1.0 / 4.0) / 256; |
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tcos[i] = cos(alpha); |
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tsin[i] = -sin(alpha); |
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cos_tab[i] = cos(i/128.0*M_PI)/8.0; |
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} |
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return 0; |
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} |
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static int decode_tag(AVCodecContext * avctx, |
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void *data, int *data_size, |
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uint8_t * buf, int buf_size) { |
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NellyMoserDecodeContext *s = avctx->priv_data; |
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int blocks, i; |
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int16_t* samples; |
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*data_size = 0; |
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samples = (int16_t*)data; |
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if (buf_size < avctx->block_align) |
||||
return buf_size; |
||||
|
||||
switch (buf_size) { |
||||
case 64: // 8000Hz
|
||||
blocks = 1; break; |
||||
case 128: // 11025Hz
|
||||
blocks = 2; break; |
||||
case 256: // 22050Hz
|
||||
blocks = 4; break; |
||||
default: |
||||
av_log(avctx, AV_LOG_DEBUG, "Tag size %d unknown, report sample!\n", buf_size); |
||||
return buf_size; |
||||
} |
||||
|
||||
for (i=0 ; i<blocks ; i++) { |
||||
nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf); |
||||
s->dsp.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES); |
||||
*data_size += NELLY_SAMPLES*sizeof(int16_t); |
||||
} |
||||
|
||||
return blocks*NELLY_SAMPLES*sizeof(int16_t); |
||||
} |
||||
|
||||
static int decode_end(AVCodecContext * avctx) { |
||||
NellyMoserDecodeContext *s = avctx->priv_data; |
||||
|
||||
ff_fft_end(&s->fftc); |
||||
return 0; |
||||
} |
||||
|
||||
AVCodec nellymoser_decoder = { |
||||
"nellymoser", |
||||
CODEC_TYPE_AUDIO, |
||||
CODEC_ID_NELLYMOSER, |
||||
sizeof(NellyMoserDecodeContext), |
||||
decode_init, |
||||
NULL, |
||||
decode_end, |
||||
decode_tag, |
||||
}; |
||||
|
||||
Loading…
Reference in new issue