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1 /* Copyright (c) 2007-2008 CSIRO
2    Copyright (c) 2007-2009 Xiph.Org Foundation
3    Copyright (c) 2008-2009 Gregory Maxwell
4    Written by Jean-Marc Valin and Gregory Maxwell */
5 /*
6    Redistribution and use in source and binary forms, with or without
7    modification, are permitted provided that the following conditions
8    are met:
9 
10    - Redistributions of source code must retain the above copyright
11    notice, this list of conditions and the following disclaimer.
12 
13    - Redistributions in binary form must reproduce the above copyright
14    notice, this list of conditions and the following disclaimer in the
15    documentation and/or other materials provided with the distribution.
16 
17    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
21    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
24    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
25    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
26    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 
30 #ifndef BANDS_H
31 #define BANDS_H
32 
33 #include "arch.h"
34 #include "modes.h"
35 #include "entenc.h"
36 #include "entdec.h"
37 #include "rate.h"
38 
39 opus_int16 bitexact_cos(opus_int16 x);
40 int bitexact_log2tan(int isin,int icos);
41 
42 /** Compute the amplitude (sqrt energy) in each of the bands
43  * @param m Mode data
44  * @param X Spectrum
45  * @param bandE Square root of the energy for each band (returned)
46  */
47 void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bandE, int end, int C, int LM, int arch);
48 
49 /*void compute_noise_energies(const CELTMode *m, const celt_sig *X, const opus_val16 *tonality, celt_ener *bandE);*/
50 
51 /** Normalise each band of X such that the energy in each band is
52     equal to 1
53  * @param m Mode data
54  * @param X Spectrum (returned normalised)
55  * @param bandE Square root of the energy for each band
56  */
57 void normalise_bands(const CELTMode *m, const celt_sig * OPUS_RESTRICT freq, celt_norm * OPUS_RESTRICT X, const celt_ener *bandE, int end, int C, int M);
58 
59 /** Denormalise each band of X to restore full amplitude
60  * @param m Mode data
61  * @param X Spectrum (returned de-normalised)
62  * @param bandE Square root of the energy for each band
63  */
64 void denormalise_bands(const CELTMode *m, const celt_norm * OPUS_RESTRICT X,
65       celt_sig * OPUS_RESTRICT freq, const opus_val16 *bandE, int start,
66       int end, int M, int downsample, int silence);
67 
68 #define SPREAD_NONE       (0)
69 #define SPREAD_LIGHT      (1)
70 #define SPREAD_NORMAL     (2)
71 #define SPREAD_AGGRESSIVE (3)
72 
73 int spreading_decision(const CELTMode *m, const celt_norm *X, int *average,
74       int last_decision, int *hf_average, int *tapset_decision, int update_hf,
75       int end, int C, int M, const int *spread_weight);
76 
77 #ifdef MEASURE_NORM_MSE
78 void measure_norm_mse(const CELTMode *m, float *X, float *X0, float *bandE, float *bandE0, int M, int N, int C);
79 #endif
80 
81 void haar1(celt_norm *X, int N0, int stride);
82 
83 /** Quantisation/encoding of the residual spectrum
84  * @param encode flag that indicates whether we're encoding (1) or decoding (0)
85  * @param m Mode data
86  * @param start First band to process
87  * @param end Last band to process + 1
88  * @param X Residual (normalised)
89  * @param Y Residual (normalised) for second channel (or NULL for mono)
90  * @param collapse_masks Anti-collapse tracking mask
91  * @param bandE Square root of the energy for each band
92  * @param pulses Bit allocation (per band) for PVQ
93  * @param shortBlocks Zero for long blocks, non-zero for short blocks
94  * @param spread Amount of spreading to use
95  * @param dual_stereo Zero for MS stereo, non-zero for dual stereo
96  * @param intensity First band to use intensity stereo
97  * @param tf_res Time-frequency resolution change
98  * @param total_bits Total number of bits that can be used for the frame (including the ones already spent)
99  * @param balance Number of unallocated bits
100  * @param en Entropy coder state
101  * @param LM log2() of the number of 2.5 subframes in the frame
102  * @param codedBands Last band to receive bits + 1
103  * @param seed Random generator seed
104  * @param arch Run-time architecture (see opus_select_arch())
105  */
106 void quant_all_bands(int encode, const CELTMode *m, int start, int end,
107       celt_norm * X, celt_norm * Y, unsigned char *collapse_masks,
108       const celt_ener *bandE, int *pulses, int shortBlocks, int spread,
109       int dual_stereo, int intensity, int *tf_res, opus_int32 total_bits,
110       opus_int32 balance, ec_ctx *ec, int M, int codedBands, opus_uint32 *seed,
111       int complexity, int arch, int disable_inv);
112 
113 void anti_collapse(const CELTMode *m, celt_norm *X_,
114       unsigned char *collapse_masks, int LM, int C, int size, int start,
115       int end, const opus_val16 *logE, const opus_val16 *prev1logE,
116       const opus_val16 *prev2logE, const int *pulses, opus_uint32 seed,
117       int arch);
118 
119 opus_uint32 celt_lcg_rand(opus_uint32 seed);
120 
121 int hysteresis_decision(opus_val16 val, const opus_val16 *thresholds, const opus_val16 *hysteresis, int N, int prev);
122 
123 #endif /* BANDS_H */
124