Eliminate some unreachable cases from the cwrs code and fixup the
[opus.git] / silk / silk_main.h
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27
28 #ifndef SILK_MAIN_H
29 #define SILK_MAIN_H
30
31 #ifdef __cplusplus
32 extern "C"
33 {
34 #endif
35
36 #include "silk_SigProc_FIX.h"
37 #include "silk_define.h"
38 #include "silk_structs.h"
39 #include "silk_tables.h"
40 #include "silk_PLC.h"
41 #include "silk_control.h"
42 #include "silk_debug.h"
43 #include "entenc.h"
44 #include "entdec.h"
45
46
47 /* Uncomment the next line to store intermadiate data to files */
48 //#define SAVE_ALL_INTERNAL_DATA      1
49 /* Uncomment the next line to force a fixed internal sampling rate (independent of what bitrate is used */
50 //#define FORCE_INTERNAL_FS_KHZ       16
51
52
53 /* Convert Left/Right stereo signal to adaptive Mid/Side representation */
54 void silk_stereo_LR_to_MS(
55     stereo_enc_state    *state,                         /* I/O  State                                       */
56     opus_int16           x1[],                           /* I/O  Left input signal, becomes mid signal       */
57     opus_int16           x2[],                           /* I/O  Right input signal, becomes side signal     */
58     opus_int8            ix[ 2 ][ 4 ],                   /* O    Quantization indices                        */
59     opus_int32           mid_side_rates_bps[],           /* O    Bitrates for mid and side signals           */
60     opus_int32           total_rate_bps,                 /* I    Total bitrate                               */
61     opus_int             prev_speech_act_Q8,             /* I    Speech activity level in previous frame     */
62     opus_int             fs_kHz,                         /* I    Sample rate (kHz)                           */
63     opus_int             frame_length                    /* I    Number of samples                           */
64 );
65
66 /* Convert adaptive Mid/Side representation to Left/Right stereo signal */
67 void silk_stereo_MS_to_LR(
68     stereo_dec_state    *state,                         /* I/O  State                                       */
69     opus_int16           x1[],                           /* I/O  Left input signal, becomes mid signal       */
70     opus_int16           x2[],                           /* I/O  Right input signal, becomes side signal     */
71     const opus_int32     pred_Q13[],                     /* I    Predictors                                  */
72     opus_int             fs_kHz,                         /* I    Samples rate (kHz)                          */
73     opus_int             frame_length                    /* I    Number of samples                           */
74 );
75
76 /* Find least-squares prediction gain for one signal based on another and quantize it */
77 opus_int32 silk_stereo_find_predictor(                   /* O    Returns predictor in Q13                    */
78     opus_int32           *ratio_Q14,                     /* O    Ratio of residual and mid energies          */
79     const opus_int16     x[],                            /* I    Basis signal                                */
80     const opus_int16     y[],                            /* I    Target signal                               */
81     opus_int32           mid_res_amp_Q0[],               /* I/O  Smoothed mid, residual norms                */
82     opus_int             length,                         /* I    Number of samples                           */
83     opus_int             smooth_coef_Q16                 /* I    Smoothing coefficient                       */
84 );
85
86 /* Quantize mid/side predictors */
87 void silk_stereo_quant_pred(
88     stereo_enc_state    *state,                         /* I/O  State                                       */
89     opus_int32           pred_Q13[],                     /* I/O  Predictors (out: quantized)                 */
90     opus_int8            ix[ 2 ][ 4 ]                    /* O    Quantization indices                        */
91 );
92
93 /* Entropy code the mid/side quantization indices */
94 void silk_stereo_encode_pred(
95     ec_enc              *psRangeEnc,                    /* I/O  Compressor data structure                   */
96     opus_int8            ix[ 2 ][ 4 ]                    /* I    Quantization indices                        */
97 );
98
99 /* Decode mid/side predictors */
100 void silk_stereo_decode_pred(
101     ec_dec              *psRangeDec,                    /* I/O  Compressor data structure                   */
102     opus_int             *decode_only_mid,               /* O    Flag that only mid channel has been coded   */
103     opus_int32           pred_Q13[]                      /* O    Predictors                                  */
104 );
105
106 /* Encodes signs of excitation */
107 void silk_encode_signs(
108     ec_enc                      *psRangeEnc,                        /* I/O  Compressor data structure                   */
109     const opus_int8              pulses[],                           /* I    pulse signal                                */
110     opus_int                     length,                             /* I    length of input                             */
111     const opus_int               signalType,                         /* I    Signal type                                 */
112     const opus_int               quantOffsetType,                    /* I    Quantization offset type                    */
113     const opus_int               sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
114 );
115
116 /* Decodes signs of excitation */
117 void silk_decode_signs(
118     ec_dec                      *psRangeDec,                        /* I/O  Compressor data structure                   */
119     opus_int                     pulses[],                           /* I/O  pulse signal                                */
120     opus_int                     length,                             /* I    length of input                             */
121     const opus_int               signalType,                         /* I    Signal type                                 */
122     const opus_int               quantOffsetType,                    /* I    Quantization offset type                    */
123     const opus_int               sum_pulses[ MAX_NB_SHELL_BLOCKS ]   /* I    Sum of absolute pulses per block            */
124 );
125
126 /* Check encoder control struct */
127 opus_int check_control_input(
128     silk_EncControlStruct        *encControl     /* I:   Control structure                               */
129 );
130
131 /* Control internal sampling rate */
132 opus_int silk_control_audio_bandwidth(
133     silk_encoder_state          *psEncC             /* I/O  Pointer to Silk encoder state               */
134 );
135
136 /* Control SNR of redidual quantizer */
137 opus_int silk_control_SNR(
138     silk_encoder_state          *psEncC,            /* I/O  Pointer to Silk encoder state               */
139     opus_int32                   TargetRate_bps      /* I    Target max bitrate (bps)                    */
140 );
141
142 /***************/
143 /* Shell coder */
144 /***************/
145
146 /* Encode quantization indices of excitation */
147 void silk_encode_pulses(
148     ec_enc                      *psRangeEnc,        /* I/O  compressor data structure                   */
149     const opus_int               signalType,         /* I    Signal type                                 */
150     const opus_int               quantOffsetType,    /* I    quantOffsetType                             */
151     opus_int8                    pulses[],           /* I    quantization indices                        */
152     const opus_int               frame_length        /* I    Frame length                                */
153 );
154
155 /* Shell encoder, operates on one shell code frame of 16 pulses */
156 void silk_shell_encoder(
157     ec_enc                      *psRangeEnc,        /* I/O  compressor data structure                   */
158     const opus_int               *pulses0            /* I    data: nonnegative pulse amplitudes          */
159 );
160
161 /* Shell decoder, operates on one shell code frame of 16 pulses */
162 void silk_shell_decoder(
163     opus_int                     *pulses0,           /* O    data: nonnegative pulse amplitudes          */
164     ec_dec                      *psRangeDec,        /* I/O  Compressor data structure                   */
165     const opus_int               pulses4             /* I    number of pulses per pulse-subframe         */
166 );
167
168 /* Gain scalar quantization with hysteresis, uniform on log scale */
169 void silk_gains_quant(
170     opus_int8                        ind[ MAX_NB_SUBFR ],        /* O    gain indices                            */
171     opus_int32                       gain_Q16[ MAX_NB_SUBFR ],   /* I/O  gains (quantized out)                   */
172     opus_int8                        *prev_ind,                  /* I/O  last index in previous frame            */
173     const opus_int                   conditional,                /* I    first gain is delta coded if 1          */
174     const opus_int                   nb_subfr                    /* I    number of subframes                     */
175 );
176
177 /* Gains scalar dequantization, uniform on log scale */
178 void silk_gains_dequant(
179     opus_int32                       gain_Q16[ MAX_NB_SUBFR ],   /* O    quantized gains                         */
180     const opus_int8                  ind[ MAX_NB_SUBFR ],        /* I    gain indices                            */
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 /* Interpolate two vectors */
187 void silk_interpolate(
188     opus_int16                       xi[ MAX_LPC_ORDER ],    /* O    interpolated vector                     */
189     const opus_int16                 x0[ MAX_LPC_ORDER ],    /* I    first vector                            */
190     const opus_int16                 x1[ MAX_LPC_ORDER ],    /* I    second vector                           */
191     const opus_int                   ifact_Q2,               /* I    interp. factor, weight on 2nd vector    */
192     const opus_int                   d                       /* I    number of parameters                    */
193 );
194
195 /* LTP tap quantizer */
196 void silk_quant_LTP_gains(
197     opus_int16           B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],              /* I/O  (un)quantized LTP gains     */
198     opus_int8            cbk_index[ MAX_NB_SUBFR ],                      /* O    Codebook Index              */
199     opus_int8            *periodicity_index,                             /* O    Periodicity Index           */
200     const opus_int32     W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ],      /* I    Error Weights in Q18        */
201     opus_int             mu_Q9,                                          /* I    Mu value (R/D tradeoff)     */
202     opus_int             lowComplexity,                                  /* I    Flag for low complexity     */
203     const opus_int       nb_subfr                                        /* I    number of subframes         */
204 );
205
206 /* Entropy constrained matrix-weighted VQ, for a single input data vector */
207 void silk_VQ_WMat_EC(
208     opus_int8                        *ind,               /* O    index of best codebook vector               */
209     opus_int32                       *rate_dist_Q14,     /* O    best weighted quantization error + mu * rate*/
210     const opus_int16                 *in_Q14,            /* I    input vector to be quantized                */
211     const opus_int32                 *W_Q18,             /* I    weighting matrix                            */
212     const opus_int8                  *cb_Q7,             /* I    codebook                                    */
213     const opus_uint8                 *cl_Q5,             /* I    code length for each codebook vector        */
214     const opus_int                   mu_Q9,              /* I    tradeoff between weighted error and rate    */
215     opus_int                         L                   /* I    number of vectors in codebook               */
216 );
217
218 /***********************************/
219 /* Noise shaping quantization (NSQ)*/
220 /***********************************/
221 void silk_NSQ(
222     const silk_encoder_state        *psEncC,                                    /* I/O  Encoder State                       */
223     silk_nsq_state                  *NSQ,                                       /* I/O  NSQ state                           */
224     SideInfoIndices                 *psIndices,                                 /* I/O  Quantization Indices                */
225     const opus_int16                 x[],                                        /* I    prefiltered input signal            */
226     opus_int8                        pulses[],                                   /* O    quantized qulse signal              */
227     const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefficients  */
228     const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefficients   */
229     const opus_int16                 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I                                     */
230     const opus_int                   HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I                                        */
231     const opus_int                   Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                       */
232     const opus_int32                 LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I                                        */
233     const opus_int32                 Gains_Q16[ MAX_NB_SUBFR ],                  /* I                                        */
234     const opus_int                   pitchL[ MAX_NB_SUBFR ],                     /* I                                        */
235     const opus_int                   Lambda_Q10,                                 /* I                                        */
236     const opus_int                   LTP_scale_Q14                               /* I    LTP state scaling                   */
237 );
238
239 /* Noise shaping using delayed decision */
240 void silk_NSQ_del_dec(
241     const silk_encoder_state        *psEncC,                                    /* I/O  Encoder State                       */
242     silk_nsq_state                  *NSQ,                                       /* I/O  NSQ state                           */
243     SideInfoIndices                 *psIndices,                                 /* I/O  Quantization Indices                */
244     const opus_int16                 x[],                                        /* I    Prefiltered input signal            */
245     opus_int8                        pulses[],                                   /* O    Quantized pulse signal              */
246     const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Prediction coefs                    */
247     const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    LT prediction coefs                 */
248     const opus_int16                 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I                                     */
249     const opus_int                   HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I                                        */
250     const opus_int                   Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                       */
251     const opus_int32                 LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I                                        */
252     const opus_int32                 Gains_Q16[ MAX_NB_SUBFR ],                  /* I                                        */
253     const opus_int                   pitchL[ MAX_NB_SUBFR ],                     /* I                                        */
254     const opus_int                   Lambda_Q10,                                 /* I                                        */
255     const opus_int                   LTP_scale_Q14                               /* I    LTP state scaling                   */
256 );
257
258 /************/
259 /* Silk VAD */
260 /************/
261 /* Initialize the Silk VAD */
262 opus_int silk_VAD_Init(                              /* O    Return value, 0 if success                  */
263     silk_VAD_state              *psSilk_VAD         /* I/O  Pointer to Silk VAD state                   */
264 );
265
266 /* Silk VAD noise level estimation */
267 void silk_VAD_GetNoiseLevels(
268     const opus_int32             pX[ VAD_N_BANDS ],  /* I    subband energies                            */
269     silk_VAD_state              *psSilk_VAD         /* I/O  Pointer to Silk VAD state                   */
270 );
271
272 /* Get speech activity level in Q8 */
273 opus_int silk_VAD_GetSA_Q8(                          /* O    Return value, 0 if success                  */
274     silk_encoder_state          *psEncC,            /* I/O  Encoder state                               */
275     const opus_int16             pIn[]               /* I    PCM input                                   */
276 );
277
278 /* Low-pass filter with variable cutoff frequency based on  */
279 /* piece-wise linear interpolation between elliptic filters */
280 /* Start by setting transition_frame_no = 1;                */
281 void silk_LP_variable_cutoff(
282     silk_LP_state               *psLP,              /* I/O  LP filter state                             */
283     opus_int16                   *signal,            /* I/O  Low-pass filtered output signal             */
284     const opus_int               frame_length        /* I    Frame length                                */
285 );
286
287 /******************/
288 /* NLSF Quantizer */
289 /******************/
290 /* Limit, stabilize, convert and quantize NLSFs */
291 void silk_process_NLSFs(
292     silk_encoder_state              *psEncC,                                /* I/O  Encoder state                               */
293     opus_int16                       PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ],     /* O    Prediction coefficients                     */
294     opus_int16                       pNLSF_Q15[         MAX_LPC_ORDER ],     /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
295     const opus_int16                 prev_NLSFq_Q15[    MAX_LPC_ORDER ]      /* I    Previous Normalized LSFs (0 - (2^15-1))     */
296 );
297
298 opus_int32 silk_NLSF_encode(                                 /* O    Returns RD value in Q25                 */
299           opus_int8                  *NLSFIndices,           /* I    Codebook path vector [ LPC_ORDER + 1 ]  */
300           opus_int16                 *pNLSF_Q15,             /* I/O  Quantized NLSF vector [ LPC_ORDER ]     */
301     const silk_NLSF_CB_struct       *psNLSF_CB,             /* I    Codebook object                         */
302     const opus_int16                 *pW_QW,                 /* I    NLSF weight vector [ LPC_ORDER ]        */
303     const opus_int                   NLSF_mu_Q20,            /* I    Rate weight for the RD optimization     */
304     const opus_int                   nSurvivors,             /* I    Max survivors after first stage         */
305     const opus_int                   signalType              /* I    Signal type: 0/1/2                      */
306 );
307
308 /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
309 void silk_NLSF_VQ(
310     opus_int32                   err_Q26[],              /* O    Quantization errors [K]                     */
311     const opus_int16             in_Q15[],               /* I    Input vectors to be quantized [LPC_order]   */
312     const opus_uint8             pCB_Q8[],               /* I    Codebook vectors [K*LPC_order]              */
313     const opus_int               K,                      /* I    Number of codebook vectors                  */
314     const opus_int               LPC_order               /* I    Number of LPCs                              */
315 );
316
317 /* Delayed-decision quantizer for NLSF residuals */
318 opus_int32 silk_NLSF_del_dec_quant(                      /* O    Returns RD value in Q25                     */
319     opus_int8                    indices[],              /* O    Quantization indices [ order ]              */
320     const opus_int16             x_Q10[],                /* I    Input [ order ]                             */
321     const opus_int16             w_Q5[],                 /* I    Weights [ order ]                           */
322     const opus_uint8             pred_coef_Q8[],         /* I    Backward predictor coefs [ order ]          */
323     const opus_int16             ec_ix[],                /* I    Indices to entropy coding tables [ order ]  */
324     const opus_uint8             ec_rates_Q5[],          /* I    Rates []                                    */
325     const opus_int               quant_step_size_Q16,    /* I    Quantization step size                      */
326     const opus_int16             inv_quant_step_size_Q6, /* I    Inverse quantization step size              */
327     const opus_int32             mu_Q20,                 /* I    R/D tradeoff                                */
328     const opus_int16             order                   /* I    Number of input values                      */
329 );
330
331 /* Unpack predictor values and indices for entropy coding tables */
332 void silk_NLSF_unpack(
333           opus_int16                 ec_ix[],                /* O    Indices to entropy tales [ LPC_ORDER ]  */
334           opus_uint8                 pred_Q8[],              /* O    LSF predictor [ LPC_ORDER ]             */
335     const silk_NLSF_CB_struct       *psNLSF_CB,             /* I    Codebook object                         */
336     const opus_int                   CB1_index               /* I    Index of vector in first LSF codebook   */
337 );
338
339 /***********************/
340 /* NLSF vector decoder */
341 /***********************/
342 void silk_NLSF_decode(
343           opus_int16                 *pNLSF_Q15,             /* O    Quantized NLSF vector [ LPC_ORDER ]     */
344           opus_int8                  *NLSFIndices,           /* I    Codebook path vector [ LPC_ORDER + 1 ]  */
345     const silk_NLSF_CB_struct       *psNLSF_CB              /* I    Codebook object                         */
346 );
347
348 /****************************************************/
349 /* Decoder Functions                                */
350 /****************************************************/
351 opus_int silk_create_decoder(
352     silk_decoder_state              **ppsDec            /* I/O  Decoder state pointer pointer               */
353 );
354
355 opus_int silk_free_decoder(
356     silk_decoder_state              *psDec              /* I/O  Decoder state pointer                       */
357 );
358
359 opus_int silk_init_decoder(
360     silk_decoder_state              *psDec              /* I/O  Decoder state pointer                       */
361 );
362
363 /* Set decoder sampling rate */
364 void silk_decoder_set_fs(
365     silk_decoder_state              *psDec,             /* I/O  Decoder state pointer                       */
366     opus_int                         fs_kHz              /* I    Sampling frequency (kHz)                    */
367 );
368
369 /****************/
370 /* Decode frame */
371 /****************/
372 opus_int silk_decode_frame(
373     silk_decoder_state          *psDec,             /* I/O  Pointer to Silk decoder state               */
374     ec_dec                      *psRangeDec,        /* I/O  Compressor data structure                   */
375     opus_int16                   pOut[],             /* O    Pointer to output speech frame              */
376     opus_int32                   *pN,                /* O    Pointer to size of output frame             */
377     opus_int                     lostFlag            /* I    0: no loss, 1 loss, 2 decode fec            */
378 );
379
380 /* Decode LBRR side info and excitation */
381 void silk_LBRR_extract(
382     silk_decoder_state          *psDec,             /* I/O  State                                       */
383     ec_dec                      *psRangeDec         /* I/O  Compressor data structure                   */
384 );
385
386 /* Decode indices from payload v4 Bitstream */
387 void silk_decode_indices(
388     silk_decoder_state          *psDec,             /* I/O  State                                       */
389     ec_dec                      *psRangeDec,        /* I/O  Compressor data structure                   */
390     opus_int                     FrameIndex,         /* I    Frame number                                */
391     opus_int                     decode_LBRR         /* I    Flag indicating LBRR data is being decoded  */
392 );
393
394 /* Decode parameters from payload */
395 void silk_decode_parameters(
396     silk_decoder_state      *psDec,                             /* I/O  State                                    */
397     silk_decoder_control    *psDecCtrl                          /* I/O  Decoder control                          */
398 );
399
400 /* Core decoder. Performs inverse NSQ operation LTP + LPC */
401 void silk_decode_core(
402     silk_decoder_state          *psDec,                             /* I/O  Decoder state               */
403     silk_decoder_control        *psDecCtrl,                         /* I    Decoder control             */
404     opus_int16                   xq[],                               /* O    Decoded speech              */
405     const opus_int               pulses[ MAX_FRAME_LENGTH ]          /* I    Pulse signal                */
406 );
407
408 /* Decode quantization indices of excitation (Shell coding) */
409 void silk_decode_pulses(
410     ec_dec                          *psRangeDec,        /* I/O  Compressor data structure                   */
411     opus_int                         pulses[],           /* O    Excitation signal                           */
412     const opus_int                   signalType,         /* I    Sigtype                                     */
413     const opus_int                   quantOffsetType,    /* I    quantOffsetType                             */
414     const opus_int                   frame_length        /* I    Frame length                                */
415 );
416
417 /******************/
418 /* CNG */
419 /******************/
420
421 /* Reset CNG */
422 void silk_CNG_Reset(
423     silk_decoder_state          *psDec              /* I/O  Decoder state                               */
424 );
425
426 /* Updates CNG estimate, and applies the CNG when packet was lost */
427 void silk_CNG(
428     silk_decoder_state          *psDec,             /* I/O  Decoder state                               */
429     silk_decoder_control        *psDecCtrl,         /* I/O  Decoder control                             */
430     opus_int16                   signal[],           /* I/O  Signal                                      */
431     opus_int                     length              /* I    Length of residual                          */
432 );
433
434 /* Encoding of various parameters */
435 void silk_encode_indices(
436     silk_encoder_state          *psEncC,            /* I/O  Encoder state                               */
437     ec_enc                      *psRangeEnc,        /* I/O  Compressor data structure                   */
438     opus_int                     FrameIndex,         /* I    Frame number                                */
439     opus_int                     encode_LBRR         /* I    Flag indicating LBRR data is being encoded  */
440 );
441
442 #ifdef __cplusplus
443 }
444 #endif
445
446 #endif