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1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6 - Redistributions of source code must retain the above copyright notice,
7 this list of conditions and the following disclaimer.
8 - Redistributions in binary form must reproduce the above copyright
9 notice, this list of conditions and the following disclaimer in the
10 documentation and/or other materials provided with the distribution.
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 names of specific contributors, may be used to endorse or promote
13 products derived from this software without specific prior written
14 permission.
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 POSSIBILITY OF SUCH DAMAGE.
26 ***********************************************************************/
27 
28 #ifndef SILK_MAIN_H
29 #define SILK_MAIN_H
30 
31 #include "SigProc_FIX.h"
32 #include "define.h"
33 #include "structs.h"
34 #include "tables.h"
35 #include "PLC.h"
36 #include "control.h"
37 #include "debug.h"
38 #include "entenc.h"
39 #include "entdec.h"
40 
41 #if defined(OPUS_X86_MAY_HAVE_SSE4_1)
42 #include "x86/main_sse.h"
43 #endif
44 
45 #if (defined(OPUS_ARM_ASM) || defined(OPUS_ARM_MAY_HAVE_NEON_INTR))
46 #include "arm/NSQ_del_dec_arm.h"
47 #endif
48 
49 /* Convert Left/Right stereo signal to adaptive Mid/Side representation */
50 void silk_stereo_LR_to_MS(
51     stereo_enc_state            *state,                         /* I/O  State                                       */
52     opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
53     opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
54     opus_int8                   ix[ 2 ][ 3 ],                   /* O    Quantization indices                        */
55     opus_int8                   *mid_only_flag,                 /* O    Flag: only mid signal coded                 */
56     opus_int32                  mid_side_rates_bps[],           /* O    Bitrates for mid and side signals           */
57     opus_int32                  total_rate_bps,                 /* I    Total bitrate                               */
58     opus_int                    prev_speech_act_Q8,             /* I    Speech activity level in previous frame     */
59     opus_int                    toMono,                         /* I    Last frame before a stereo->mono transition */
60     opus_int                    fs_kHz,                         /* I    Sample rate (kHz)                           */
61     opus_int                    frame_length                    /* I    Number of samples                           */
62 );
63 
64 /* Convert adaptive Mid/Side representation to Left/Right stereo signal */
65 void silk_stereo_MS_to_LR(
66     stereo_dec_state            *state,                         /* I/O  State                                       */
67     opus_int16                  x1[],                           /* I/O  Left input signal, becomes mid signal       */
68     opus_int16                  x2[],                           /* I/O  Right input signal, becomes side signal     */
69     const opus_int32            pred_Q13[],                     /* I    Predictors                                  */
70     opus_int                    fs_kHz,                         /* I    Samples rate (kHz)                          */
71     opus_int                    frame_length                    /* I    Number of samples                           */
72 );
73 
74 /* Find least-squares prediction gain for one signal based on another and quantize it */
75 opus_int32 silk_stereo_find_predictor(                          /* O    Returns predictor in Q13                    */
76     opus_int32                  *ratio_Q14,                     /* O    Ratio of residual and mid energies          */
77     const opus_int16            x[],                            /* I    Basis signal                                */
78     const opus_int16            y[],                            /* I    Target signal                               */
79     opus_int32                  mid_res_amp_Q0[],               /* I/O  Smoothed mid, residual norms                */
80     opus_int                    length,                         /* I    Number of samples                           */
81     opus_int                    smooth_coef_Q16                 /* I    Smoothing coefficient                       */
82 );
83 
84 /* Quantize mid/side predictors */
85 void silk_stereo_quant_pred(
86     opus_int32                  pred_Q13[],                     /* I/O  Predictors (out: quantized)                 */
87     opus_int8                   ix[ 2 ][ 3 ]                    /* O    Quantization indices                        */
88 );
89 
90 /* Entropy code the mid/side quantization indices */
91 void silk_stereo_encode_pred(
92     ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
93     opus_int8                   ix[ 2 ][ 3 ]                    /* I    Quantization indices                        */
94 );
95 
96 /* Entropy code the mid-only flag */
97 void silk_stereo_encode_mid_only(
98     ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
99     opus_int8                   mid_only_flag
100 );
101 
102 /* Decode mid/side predictors */
103 void silk_stereo_decode_pred(
104     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
105     opus_int32                  pred_Q13[]                      /* O    Predictors                                  */
106 );
107 
108 /* Decode mid-only flag */
109 void silk_stereo_decode_mid_only(
110     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
111     opus_int                    *decode_only_mid                /* O    Flag that only mid channel has been coded   */
112 );
113 
114 /* Encodes signs of excitation */
115 void silk_encode_signs(
116     ec_enc                      *psRangeEnc,                        /* I/O  Compressor data structure               */
117     const opus_int8             pulses[],                           /* I    pulse signal                            */
118     opus_int                    length,                             /* I    length of input                         */
119     const opus_int              signalType,                         /* I    Signal type                             */
120     const opus_int              quantOffsetType,                    /* I    Quantization offset type                */
121     const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block        */
122 );
123 
124 /* Decodes signs of excitation */
125 void silk_decode_signs(
126     ec_dec                      *psRangeDec,                        /* I/O  Compressor data structure               */
127     opus_int16                  pulses[],                           /* I/O  pulse signal                            */
128     opus_int                    length,                             /* I    length of input                         */
129     const opus_int              signalType,                         /* I    Signal type                             */
130     const opus_int              quantOffsetType,                    /* I    Quantization offset type                */
131     const opus_int              sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block        */
132 );
133 
134 /* Check encoder control struct */
135 opus_int check_control_input(
136     silk_EncControlStruct        *encControl                    /* I    Control structure                           */
137 );
138 
139 /* Control internal sampling rate */
140 opus_int silk_control_audio_bandwidth(
141     silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
142     silk_EncControlStruct       *encControl                     /* I    Control structure                           */
143 );
144 
145 /* Control SNR of redidual quantizer */
146 opus_int silk_control_SNR(
147     silk_encoder_state          *psEncC,                        /* I/O  Pointer to Silk encoder state               */
148     opus_int32                  TargetRate_bps                  /* I    Target max bitrate (bps)                    */
149 );
150 
151 /***************/
152 /* Shell coder */
153 /***************/
154 
155 /* Encode quantization indices of excitation */
156 void silk_encode_pulses(
157     ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
158     const opus_int              signalType,                     /* I    Signal type                                 */
159     const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
160     opus_int8                   pulses[],                       /* I    quantization indices                        */
161     const opus_int              frame_length                    /* I    Frame length                                */
162 );
163 
164 /* Shell encoder, operates on one shell code frame of 16 pulses */
165 void silk_shell_encoder(
166     ec_enc                      *psRangeEnc,                    /* I/O  compressor data structure                   */
167     const opus_int              *pulses0                        /* I    data: nonnegative pulse amplitudes          */
168 );
169 
170 /* Shell decoder, operates on one shell code frame of 16 pulses */
171 void silk_shell_decoder(
172     opus_int16                  *pulses0,                       /* O    data: nonnegative pulse amplitudes          */
173     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
174     const opus_int              pulses4                         /* I    number of pulses per pulse-subframe         */
175 );
176 
177 /* Gain scalar quantization with hysteresis, uniform on log scale */
178 void silk_gains_quant(
179     opus_int8                   ind[ MAX_NB_SUBFR ],            /* O    gain indices                                */
180     opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* I/O  gains (quantized out)                       */
181     opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
182     const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
183     const opus_int              nb_subfr                        /* I    number of subframes                         */
184 );
185 
186 /* Gains scalar dequantization, uniform on log scale */
187 void silk_gains_dequant(
188     opus_int32                  gain_Q16[ MAX_NB_SUBFR ],       /* O    quantized gains                             */
189     const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
190     opus_int8                   *prev_ind,                      /* I/O  last index in previous frame                */
191     const opus_int              conditional,                    /* I    first gain is delta coded if 1              */
192     const opus_int              nb_subfr                        /* I    number of subframes                          */
193 );
194 
195 /* Compute unique identifier of gain indices vector */
196 opus_int32 silk_gains_ID(                                       /* O    returns unique identifier of gains          */
197     const opus_int8             ind[ MAX_NB_SUBFR ],            /* I    gain indices                                */
198     const opus_int              nb_subfr                        /* I    number of subframes                         */
199 );
200 
201 /* Interpolate two vectors */
202 void silk_interpolate(
203     opus_int16                  xi[ MAX_LPC_ORDER ],            /* O    interpolated vector                         */
204     const opus_int16            x0[ MAX_LPC_ORDER ],            /* I    first vector                                */
205     const opus_int16            x1[ MAX_LPC_ORDER ],            /* I    second vector                               */
206     const opus_int              ifact_Q2,                       /* I    interp. factor, weight on 2nd vector        */
207     const opus_int              d                               /* I    number of parameters                        */
208 );
209 
210 /* LTP tap quantizer */
211 void silk_quant_LTP_gains(
212     opus_int16                  B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],          /* O    Quantized LTP gains             */
213     opus_int8                   cbk_index[ MAX_NB_SUBFR ],                  /* O    Codebook Index                  */
214     opus_int8                   *periodicity_index,                         /* O    Periodicity Index               */
215     opus_int32                  *sum_gain_dB_Q7,                            /* I/O  Cumulative max prediction gain  */
216     opus_int                    *pred_gain_dB_Q7,                           /* O    LTP prediction gain             */
217     const opus_int32            XX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I    Correlation matrix in Q18       */
218     const opus_int32            xX_Q17[ MAX_NB_SUBFR*LTP_ORDER ],           /* I    Correlation vector in Q18       */
219     const opus_int              subfr_len,                                  /* I    Number of samples per subframe  */
220     const opus_int              nb_subfr,                                   /* I    Number of subframes             */
221     int                         arch                                        /* I    Run-time architecture           */
222 );
223 
224 /* Entropy constrained matrix-weighted VQ, for a single input data vector */
225 void silk_VQ_WMat_EC_c(
226     opus_int8                   *ind,                           /* O    index of best codebook vector               */
227     opus_int32                  *res_nrg_Q15,                   /* O    best residual energy                        */
228     opus_int32                  *rate_dist_Q8,                  /* O    best total bitrate                          */
229     opus_int                    *gain_Q7,                       /* O    sum of absolute LTP coefficients            */
230     const opus_int32            *XX_Q17,                        /* I    correlation matrix                          */
231     const opus_int32            *xX_Q17,                        /* I    correlation vector                          */
232     const opus_int8             *cb_Q7,                         /* I    codebook                                    */
233     const opus_uint8            *cb_gain_Q7,                    /* I    codebook effective gain                     */
234     const opus_uint8            *cl_Q5,                         /* I    code length for each codebook vector        */
235     const opus_int              subfr_len,                      /* I    number of samples per subframe              */
236     const opus_int32            max_gain_Q7,                    /* I    maximum sum of absolute LTP coefficients    */
237     const opus_int              L                               /* I    number of vectors in codebook               */
238 );
239 
240 #if !defined(OVERRIDE_silk_VQ_WMat_EC)
241 #define silk_VQ_WMat_EC(ind, res_nrg_Q15, rate_dist_Q8, gain_Q7, XX_Q17, xX_Q17, cb_Q7, cb_gain_Q7, cl_Q5, subfr_len, max_gain_Q7, L, arch) \
242     ((void)(arch),silk_VQ_WMat_EC_c(ind, res_nrg_Q15, rate_dist_Q8, gain_Q7, XX_Q17, xX_Q17, cb_Q7, cb_gain_Q7, cl_Q5, subfr_len, max_gain_Q7, L))
243 #endif
244 
245 /************************************/
246 /* Noise shaping quantization (NSQ) */
247 /************************************/
248 
249 void silk_NSQ_c(
250     const silk_encoder_state    *psEncC,                                    /* I    Encoder State                   */
251     silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
252     SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
253     const opus_int16            x16[],                                      /* I    Input                           */
254     opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
255     const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
256     const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
257     const opus_int16            AR_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I  Noise shaping coefs             */
258     const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
259     const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
260     const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
261     const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
262     const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
263     const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
264     const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
265 );
266 
267 #if !defined(OVERRIDE_silk_NSQ)
268 #define silk_NSQ(psEncC, NSQ, psIndices, x16, pulses, PredCoef_Q12, LTPCoef_Q14, AR_Q13, \
269                    HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, pitchL, Lambda_Q10, LTP_scale_Q14, arch) \
270     ((void)(arch),silk_NSQ_c(psEncC, NSQ, psIndices, x16, pulses, PredCoef_Q12, LTPCoef_Q14, AR_Q13, \
271                    HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, pitchL, Lambda_Q10, LTP_scale_Q14))
272 #endif
273 
274 /* Noise shaping using delayed decision */
275 void silk_NSQ_del_dec_c(
276     const silk_encoder_state    *psEncC,                                    /* I    Encoder State                   */
277     silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
278     SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
279     const opus_int16            x16[],                                      /* I    Input                           */
280     opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
281     const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
282     const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
283     const opus_int16            AR_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I  Noise shaping coefs             */
284     const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
285     const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
286     const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
287     const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
288     const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
289     const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
290     const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
291 );
292 
293 #if !defined(OVERRIDE_silk_NSQ_del_dec)
294 #define silk_NSQ_del_dec(psEncC, NSQ, psIndices, x16, pulses, PredCoef_Q12, LTPCoef_Q14, AR_Q13, \
295                            HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, pitchL, Lambda_Q10, LTP_scale_Q14, arch) \
296     ((void)(arch),silk_NSQ_del_dec_c(psEncC, NSQ, psIndices, x16, pulses, PredCoef_Q12, LTPCoef_Q14, AR_Q13, \
297                            HarmShapeGain_Q14, Tilt_Q14, LF_shp_Q14, Gains_Q16, pitchL, Lambda_Q10, LTP_scale_Q14))
298 #endif
299 
300 /************/
301 /* Silk VAD */
302 /************/
303 /* Initialize the Silk VAD */
304 opus_int silk_VAD_Init(                                         /* O    Return value, 0 if success                  */
305     silk_VAD_state              *psSilk_VAD                     /* I/O  Pointer to Silk VAD state                   */
306 );
307 
308 /* Get speech activity level in Q8 */
309 opus_int silk_VAD_GetSA_Q8_c(                                   /* O    Return value, 0 if success                  */
310     silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
311     const opus_int16            pIn[]                           /* I    PCM input                                   */
312 );
313 
314 #if !defined(OVERRIDE_silk_VAD_GetSA_Q8)
315 #define silk_VAD_GetSA_Q8(psEnC, pIn, arch) ((void)(arch),silk_VAD_GetSA_Q8_c(psEnC, pIn))
316 #endif
317 
318 /* Low-pass filter with variable cutoff frequency based on  */
319 /* piece-wise linear interpolation between elliptic filters */
320 /* Start by setting transition_frame_no = 1;                */
321 void silk_LP_variable_cutoff(
322     silk_LP_state               *psLP,                          /* I/O  LP filter state                             */
323     opus_int16                  *frame,                         /* I/O  Low-pass filtered output signal             */
324     const opus_int              frame_length                    /* I    Frame length                                */
325 );
326 
327 /******************/
328 /* NLSF Quantizer */
329 /******************/
330 /* Limit, stabilize, convert and quantize NLSFs */
331 void silk_process_NLSFs(
332     silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
333     opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
334     opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
335     const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
336 );
337 
338 opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
339           opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
340           opus_int16            *pNLSF_Q15,                     /* I/O  Quantized NLSF vector [ LPC_ORDER ]         */
341     const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
342     const opus_int16            *pW_QW,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
343     const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
344     const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
345     const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
346 );
347 
348 /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
349 void silk_NLSF_VQ(
350     opus_int32                  err_Q26[],                      /* O    Quantization errors [K]                     */
351     const opus_int16            in_Q15[],                       /* I    Input vectors to be quantized [LPC_order]   */
352     const opus_uint8            pCB_Q8[],                       /* I    Codebook vectors [K*LPC_order]              */
353     const opus_int16            pWght_Q9[],                     /* I    Codebook weights [K*LPC_order]              */
354     const opus_int              K,                              /* I    Number of codebook vectors                  */
355     const opus_int              LPC_order                       /* I    Number of LPCs                              */
356 );
357 
358 /* Delayed-decision quantizer for NLSF residuals */
359 opus_int32 silk_NLSF_del_dec_quant(                             /* O    Returns RD value in Q25                     */
360     opus_int8                   indices[],                      /* O    Quantization indices [ order ]              */
361     const opus_int16            x_Q10[],                        /* I    Input [ order ]                             */
362     const opus_int16            w_Q5[],                         /* I    Weights [ order ]                           */
363     const opus_uint8            pred_coef_Q8[],                 /* I    Backward predictor coefs [ order ]          */
364     const opus_int16            ec_ix[],                        /* I    Indices to entropy coding tables [ order ]  */
365     const opus_uint8            ec_rates_Q5[],                  /* I    Rates []                                    */
366     const opus_int              quant_step_size_Q16,            /* I    Quantization step size                      */
367     const opus_int16            inv_quant_step_size_Q6,         /* I    Inverse quantization step size              */
368     const opus_int32            mu_Q20,                         /* I    R/D tradeoff                                */
369     const opus_int16            order                           /* I    Number of input values                      */
370 );
371 
372 /* Unpack predictor values and indices for entropy coding tables */
373 void silk_NLSF_unpack(
374           opus_int16            ec_ix[],                        /* O    Indices to entropy tables [ LPC_ORDER ]     */
375           opus_uint8            pred_Q8[],                      /* O    LSF predictor [ LPC_ORDER ]                 */
376     const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
377     const opus_int              CB1_index                       /* I    Index of vector in first LSF codebook       */
378 );
379 
380 /***********************/
381 /* NLSF vector decoder */
382 /***********************/
383 void silk_NLSF_decode(
384           opus_int16            *pNLSF_Q15,                     /* O    Quantized NLSF vector [ LPC_ORDER ]         */
385           opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
386     const silk_NLSF_CB_struct   *psNLSF_CB                      /* I    Codebook object                             */
387 );
388 
389 /****************************************************/
390 /* Decoder Functions                                */
391 /****************************************************/
392 opus_int silk_init_decoder(
393     silk_decoder_state          *psDec                          /* I/O  Decoder state pointer                       */
394 );
395 
396 /* Set decoder sampling rate */
397 opus_int silk_decoder_set_fs(
398     silk_decoder_state          *psDec,                         /* I/O  Decoder state pointer                       */
399     opus_int                    fs_kHz,                         /* I    Sampling frequency (kHz)                    */
400     opus_int32                  fs_API_Hz                       /* I    API Sampling frequency (Hz)                 */
401 );
402 
403 /****************/
404 /* Decode frame */
405 /****************/
406 opus_int silk_decode_frame(
407     silk_decoder_state          *psDec,                         /* I/O  Pointer to Silk decoder state               */
408     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
409     opus_int16                  pOut[],                         /* O    Pointer to output speech frame              */
410     opus_int32                  *pN,                            /* O    Pointer to size of output frame             */
411     opus_int                    lostFlag,                       /* I    0: no loss, 1 loss, 2 decode fec            */
412     opus_int                    condCoding,                     /* I    The type of conditional coding to use       */
413     int                         arch                            /* I    Run-time architecture                       */
414 );
415 
416 /* Decode indices from bitstream */
417 void silk_decode_indices(
418     silk_decoder_state          *psDec,                         /* I/O  State                                       */
419     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
420     opus_int                    FrameIndex,                     /* I    Frame number                                */
421     opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
422     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
423 );
424 
425 /* Decode parameters from payload */
426 void silk_decode_parameters(
427     silk_decoder_state          *psDec,                         /* I/O  State                                       */
428     silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
429     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
430 );
431 
432 /* Core decoder. Performs inverse NSQ operation LTP + LPC */
433 void silk_decode_core(
434     silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
435     silk_decoder_control        *psDecCtrl,                     /* I    Decoder control                             */
436     opus_int16                  xq[],                           /* O    Decoded speech                              */
437     const opus_int16            pulses[ MAX_FRAME_LENGTH ],     /* I    Pulse signal                                */
438     int                         arch                            /* I    Run-time architecture                       */
439 );
440 
441 /* Decode quantization indices of excitation (Shell coding) */
442 void silk_decode_pulses(
443     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
444     opus_int16                  pulses[],                       /* O    Excitation signal                           */
445     const opus_int              signalType,                     /* I    Sigtype                                     */
446     const opus_int              quantOffsetType,                /* I    quantOffsetType                             */
447     const opus_int              frame_length                    /* I    Frame length                                */
448 );
449 
450 /******************/
451 /* CNG */
452 /******************/
453 
454 /* Reset CNG */
455 void silk_CNG_Reset(
456     silk_decoder_state          *psDec                          /* I/O  Decoder state                               */
457 );
458 
459 /* Updates CNG estimate, and applies the CNG when packet was lost */
460 void silk_CNG(
461     silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
462     silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
463     opus_int16                  frame[],                        /* I/O  Signal                                      */
464     opus_int                    length                          /* I    Length of residual                          */
465 );
466 
467 /* Encoding of various parameters */
468 void silk_encode_indices(
469     silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
470     ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
471     opus_int                    FrameIndex,                     /* I    Frame number                                */
472     opus_int                    encode_LBRR,                    /* I    Flag indicating LBRR data is being encoded  */
473     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
474 );
475 
476 #endif
477