Implements glitchless switching between SILK bandwidths
[opus.git] / silk / main.h
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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 /* Uncomment the next line to store intermadiate data to files */
42 /*#define SAVE_ALL_INTERNAL_DATA      1*/
43 /* Uncomment the next line to force a fixed internal sampling rate (independent of what bitrate is used */
44 /*#define FORCE_INTERNAL_FS_KHZ       16*/
45
46 /* Simple way to make [8000, 12000, 16000, 24000, 48000] to [0,1,2,3,4] */
47 #define rateID(R) ( ( ( ((R)>>12) - ((R)>16000) ) >> ((R)>24000) ) - 1 )
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_int                     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_int                     *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 /* Interpolate two vectors */
196 void silk_interpolate(
197     opus_int16                       xi[ MAX_LPC_ORDER ],    /* O    interpolated vector                     */
198     const opus_int16                 x0[ MAX_LPC_ORDER ],    /* I    first vector                            */
199     const opus_int16                 x1[ MAX_LPC_ORDER ],    /* I    second vector                           */
200     const opus_int                   ifact_Q2,               /* I    interp. factor, weight on 2nd vector    */
201     const opus_int                   d                       /* I    number of parameters                    */
202 );
203
204 /* LTP tap quantizer */
205 void silk_quant_LTP_gains(
206     opus_int16           B_Q14[ MAX_NB_SUBFR * LTP_ORDER ],              /* I/O  (un)quantized LTP gains     */
207     opus_int8            cbk_index[ MAX_NB_SUBFR ],                      /* O    Codebook Index              */
208     opus_int8            *periodicity_index,                             /* O    Periodicity Index           */
209     const opus_int32     W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ],      /* I    Error Weights in Q18        */
210     opus_int             mu_Q9,                                          /* I    Mu value (R/D tradeoff)     */
211     opus_int             lowComplexity,                                  /* I    Flag for low complexity     */
212     const opus_int       nb_subfr                                        /* I    number of subframes         */
213 );
214
215 /* Entropy constrained matrix-weighted VQ, for a single input data vector */
216 void silk_VQ_WMat_EC(
217     opus_int8                        *ind,               /* O    index of best codebook vector               */
218     opus_int32                       *rate_dist_Q14,     /* O    best weighted quantization error + mu * rate*/
219     const opus_int16                 *in_Q14,            /* I    input vector to be quantized                */
220     const opus_int32                 *W_Q18,             /* I    weighting matrix                            */
221     const opus_int8                  *cb_Q7,             /* I    codebook                                    */
222     const opus_uint8                 *cl_Q5,             /* I    code length for each codebook vector        */
223     const opus_int                   mu_Q9,              /* I    tradeoff between weighted error and rate    */
224     opus_int                         L                   /* I    number of vectors in codebook               */
225 );
226
227 /***********************************/
228 /* Noise shaping quantization (NSQ)*/
229 /***********************************/
230 void silk_NSQ(
231     const silk_encoder_state        *psEncC,                                    /* I/O  Encoder State                       */
232     silk_nsq_state                  *NSQ,                                       /* I/O  NSQ state                           */
233     SideInfoIndices                 *psIndices,                                 /* I/O  Quantization Indices                */
234     const opus_int16                 x[],                                        /* I    prefiltered input signal            */
235     opus_int8                        pulses[],                                   /* O    quantized qulse signal              */
236     const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefficients  */
237     const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefficients   */
238     const opus_int16                 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I                                     */
239     const opus_int                   HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I                                        */
240     const opus_int                   Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                       */
241     const opus_int32                 LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I                                        */
242     const opus_int32                 Gains_Q16[ MAX_NB_SUBFR ],                  /* I                                        */
243     const opus_int                   pitchL[ MAX_NB_SUBFR ],                     /* I                                        */
244     const opus_int                   Lambda_Q10,                                 /* I                                        */
245     const opus_int                   LTP_scale_Q14                               /* I    LTP state scaling                   */
246 );
247
248 /* Noise shaping using delayed decision */
249 void silk_NSQ_del_dec(
250     const silk_encoder_state        *psEncC,                                    /* I/O  Encoder State                       */
251     silk_nsq_state                  *NSQ,                                       /* I/O  NSQ state                           */
252     SideInfoIndices                 *psIndices,                                 /* I/O  Quantization Indices                */
253     const opus_int16                 x[],                                        /* I    Prefiltered input signal            */
254     opus_int8                        pulses[],                                   /* O    Quantized pulse signal              */
255     const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Prediction coefs                    */
256     const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    LT prediction coefs                 */
257     const opus_int16                 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I                                     */
258     const opus_int                   HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I                                        */
259     const opus_int                   Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                       */
260     const opus_int32                 LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I                                        */
261     const opus_int32                 Gains_Q16[ MAX_NB_SUBFR ],                  /* I                                        */
262     const opus_int                   pitchL[ MAX_NB_SUBFR ],                     /* I                                        */
263     const opus_int                   Lambda_Q10,                                 /* I                                        */
264     const opus_int                   LTP_scale_Q14                               /* I    LTP state scaling                   */
265 );
266
267 /************/
268 /* Silk VAD */
269 /************/
270 /* Initialize the Silk VAD */
271 opus_int silk_VAD_Init(                              /* O    Return value, 0 if success                  */
272     silk_VAD_state              *psSilk_VAD         /* I/O  Pointer to Silk VAD state                   */
273 );
274
275 /* Get speech activity level in Q8 */
276 opus_int silk_VAD_GetSA_Q8(                          /* O    Return value, 0 if success                  */
277     silk_encoder_state          *psEncC,            /* I/O  Encoder state                               */
278     const opus_int16             pIn[]               /* I    PCM input                                   */
279 );
280
281 /* Low-pass filter with variable cutoff frequency based on  */
282 /* piece-wise linear interpolation between elliptic filters */
283 /* Start by setting transition_frame_no = 1;                */
284 void silk_LP_variable_cutoff(
285     silk_LP_state               *psLP,              /* I/O  LP filter state                             */
286     opus_int16                   *signal,            /* I/O  Low-pass filtered output signal             */
287     const opus_int               frame_length        /* I    Frame length                                */
288 );
289
290 /******************/
291 /* NLSF Quantizer */
292 /******************/
293 /* Limit, stabilize, convert and quantize NLSFs */
294 void silk_process_NLSFs(
295     silk_encoder_state              *psEncC,                                /* I/O  Encoder state                               */
296     opus_int16                       PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ],     /* O    Prediction coefficients                     */
297     opus_int16                       pNLSF_Q15[         MAX_LPC_ORDER ],     /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
298     const opus_int16                 prev_NLSFq_Q15[    MAX_LPC_ORDER ]      /* I    Previous Normalized LSFs (0 - (2^15-1))     */
299 );
300
301 opus_int32 silk_NLSF_encode(                                 /* O    Returns RD value in Q25                 */
302           opus_int8                  *NLSFIndices,           /* I    Codebook path vector [ LPC_ORDER + 1 ]  */
303           opus_int16                 *pNLSF_Q15,             /* I/O  Quantized NLSF vector [ LPC_ORDER ]     */
304     const silk_NLSF_CB_struct       *psNLSF_CB,             /* I    Codebook object                         */
305     const opus_int16                 *pW_QW,                 /* I    NLSF weight vector [ LPC_ORDER ]        */
306     const opus_int                   NLSF_mu_Q20,            /* I    Rate weight for the RD optimization     */
307     const opus_int                   nSurvivors,             /* I    Max survivors after first stage         */
308     const opus_int                   signalType              /* I    Signal type: 0/1/2                      */
309 );
310
311 /* Compute quantization errors for an LPC_order element input vector for a VQ codebook */
312 void silk_NLSF_VQ(
313     opus_int32                   err_Q26[],              /* O    Quantization errors [K]                     */
314     const opus_int16             in_Q15[],               /* I    Input vectors to be quantized [LPC_order]   */
315     const opus_uint8             pCB_Q8[],               /* I    Codebook vectors [K*LPC_order]              */
316     const opus_int               K,                      /* I    Number of codebook vectors                  */
317     const opus_int               LPC_order               /* I    Number of LPCs                              */
318 );
319
320 /* Delayed-decision quantizer for NLSF residuals */
321 opus_int32 silk_NLSF_del_dec_quant(                      /* O    Returns RD value in Q25                     */
322     opus_int8                    indices[],              /* O    Quantization indices [ order ]              */
323     const opus_int16             x_Q10[],                /* I    Input [ order ]                             */
324     const opus_int16             w_Q5[],                 /* I    Weights [ order ]                           */
325     const opus_uint8             pred_coef_Q8[],         /* I    Backward predictor coefs [ order ]          */
326     const opus_int16             ec_ix[],                /* I    Indices to entropy coding tables [ order ]  */
327     const opus_uint8             ec_rates_Q5[],          /* I    Rates []                                    */
328     const opus_int               quant_step_size_Q16,    /* I    Quantization step size                      */
329     const opus_int16             inv_quant_step_size_Q6, /* I    Inverse quantization step size              */
330     const opus_int32             mu_Q20,                 /* I    R/D tradeoff                                */
331     const opus_int16             order                   /* I    Number of input values                      */
332 );
333
334 /* Unpack predictor values and indices for entropy coding tables */
335 void silk_NLSF_unpack(
336           opus_int16                 ec_ix[],                /* O    Indices to entropy tales [ LPC_ORDER ]  */
337           opus_uint8                 pred_Q8[],              /* O    LSF predictor [ LPC_ORDER ]             */
338     const silk_NLSF_CB_struct       *psNLSF_CB,             /* I    Codebook object                         */
339     const opus_int                   CB1_index               /* I    Index of vector in first LSF codebook   */
340 );
341
342 /***********************/
343 /* NLSF vector decoder */
344 /***********************/
345 void silk_NLSF_decode(
346           opus_int16                 *pNLSF_Q15,             /* O    Quantized NLSF vector [ LPC_ORDER ]     */
347           opus_int8                  *NLSFIndices,           /* I    Codebook path vector [ LPC_ORDER + 1 ]  */
348     const silk_NLSF_CB_struct       *psNLSF_CB              /* I    Codebook object                         */
349 );
350
351 /****************************************************/
352 /* Decoder Functions                                */
353 /****************************************************/
354 opus_int silk_create_decoder(
355     silk_decoder_state              **ppsDec            /* I/O  Decoder state pointer pointer               */
356 );
357
358 opus_int silk_free_decoder(
359     silk_decoder_state              *psDec              /* I/O  Decoder state pointer                       */
360 );
361
362 opus_int silk_init_decoder(
363     silk_decoder_state              *psDec              /* I/O  Decoder state pointer                       */
364 );
365
366 /* Set decoder sampling rate */
367 opus_int silk_decoder_set_fs(
368     silk_decoder_state              *psDec,             /* I/O  Decoder state pointer                       */
369     opus_int                         fs_kHz,             /* I    Sampling frequency (kHz)                    */
370     opus_int                         fs_API_Hz           /* I    API Sampling frequency (Hz)                 */
371 );
372
373 /****************/
374 /* Decode frame */
375 /****************/
376 opus_int silk_decode_frame(
377     silk_decoder_state          *psDec,             /* I/O  Pointer to Silk decoder state               */
378     ec_dec                      *psRangeDec,        /* I/O  Compressor data structure                   */
379     opus_int16                   pOut[],             /* O    Pointer to output speech frame              */
380     opus_int32                   *pN,                /* O    Pointer to size of output frame             */
381     opus_int                     lostFlag,           /* I    0: no loss, 1 loss, 2 decode fec            */
382     opus_int                     condCoding          /* I    The type of conditional coding to use       */
383 );
384
385 /* Decode LBRR side info and excitation */
386 void silk_LBRR_extract(
387     silk_decoder_state          *psDec,             /* I/O  State                                       */
388     ec_dec                      *psRangeDec         /* I/O  Compressor data structure                   */
389 );
390
391 /* Decode indices from payload v4 Bitstream */
392 void silk_decode_indices(
393     silk_decoder_state          *psDec,             /* I/O  State                                       */
394     ec_dec                      *psRangeDec,        /* I/O  Compressor data structure                   */
395     opus_int                     FrameIndex,         /* I    Frame number                                */
396     opus_int                     decode_LBRR,        /* I    Flag indicating LBRR data is being decoded  */
397     opus_int                     condCoding          /* I    The type of conditional coding to use       */
398 );
399
400 /* Decode parameters from payload */
401 void silk_decode_parameters(
402     silk_decoder_state      *psDec,                             /* I/O  State                                    */
403     silk_decoder_control    *psDecCtrl,                         /* I/O  Decoder control                          */
404     opus_int                 condCoding                         /* I    The type of conditional coding to use    */
405 );
406
407 /* Core decoder. Performs inverse NSQ operation LTP + LPC */
408 void silk_decode_core(
409     silk_decoder_state          *psDec,                             /* I/O  Decoder state               */
410     silk_decoder_control        *psDecCtrl,                         /* I    Decoder control             */
411     opus_int16                   xq[],                               /* O    Decoded speech              */
412     const opus_int               pulses[ MAX_FRAME_LENGTH ]          /* I    Pulse signal                */
413 );
414
415 /* Decode quantization indices of excitation (Shell coding) */
416 void silk_decode_pulses(
417     ec_dec                          *psRangeDec,        /* I/O  Compressor data structure                   */
418     opus_int                         pulses[],           /* O    Excitation signal                           */
419     const opus_int                   signalType,         /* I    Sigtype                                     */
420     const opus_int                   quantOffsetType,    /* I    quantOffsetType                             */
421     const opus_int                   frame_length        /* I    Frame length                                */
422 );
423
424 /******************/
425 /* CNG */
426 /******************/
427
428 /* Reset CNG */
429 void silk_CNG_Reset(
430     silk_decoder_state          *psDec              /* I/O  Decoder state                               */
431 );
432
433 /* Updates CNG estimate, and applies the CNG when packet was lost */
434 void silk_CNG(
435     silk_decoder_state          *psDec,             /* I/O  Decoder state                               */
436     silk_decoder_control        *psDecCtrl,         /* I/O  Decoder control                             */
437     opus_int16                   signal[],           /* I/O  Signal                                      */
438     opus_int                     length              /* I    Length of residual                          */
439 );
440
441 /* Encoding of various parameters */
442 void silk_encode_indices(
443     silk_encoder_state          *psEncC,            /* I/O  Encoder state                               */
444     ec_enc                      *psRangeEnc,        /* I/O  Compressor data structure                   */
445     opus_int                     FrameIndex,         /* I    Frame number                                */
446     opus_int                     encode_LBRR,        /* I    Flag indicating LBRR data is being encoded  */
447     opus_int                     condCoding          /* I    The type of conditional coding to use       */
448 );
449
450 #endif