0e17ec28acbeedcfeb00024502f0a019bb8db8bc
[opus.git] / silk / structs.h
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
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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_STRUCTS_H
29 #define SILK_STRUCTS_H
30
31 #include "typedef.h"
32 #include "SigProc_FIX.h"
33 #include "define.h"
34 #include "entenc.h"
35 #include "entdec.h"
36
37 #ifdef __cplusplus
38 extern "C"
39 {
40 #endif
41
42 /************************************/
43 /* Noise shaping quantization state */
44 /************************************/
45 typedef struct {
46     opus_int16                  xq[           2 * MAX_FRAME_LENGTH ]; /* Buffer for quantized output signal                             */
47     opus_int32                  sLTP_shp_Q14[ 2 * MAX_FRAME_LENGTH ];
48     opus_int32                  sLPC_Q14[ MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH ];
49     opus_int32                  sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
50     opus_int32                  sLF_AR_shp_Q14;
51     opus_int                    lagPrev;
52     opus_int                    sLTP_buf_idx;
53     opus_int                    sLTP_shp_buf_idx;
54     opus_int32                  rand_seed;
55     opus_int32                  prev_gain_Q16;
56     opus_int                    rewhite_flag;
57 } silk_nsq_state;
58
59 /********************************/
60 /* VAD state                    */
61 /********************************/
62 typedef struct {
63     opus_int32                  AnaState[ 2 ];                  /* Analysis filterbank state: 0-8 kHz                                   */
64     opus_int32                  AnaState1[ 2 ];                 /* Analysis filterbank state: 0-4 kHz                                   */
65     opus_int32                  AnaState2[ 2 ];                 /* Analysis filterbank state: 0-2 kHz                                   */
66     opus_int32                  XnrgSubfr[ VAD_N_BANDS ];       /* Subframe energies                                                    */
67     opus_int32                  NrgRatioSmth_Q8[ VAD_N_BANDS ]; /* Smoothed energy level in each band                                   */
68     opus_int16                  HPstate;                        /* State of differentiator in the lowest band                           */
69     opus_int32                  NL[ VAD_N_BANDS ];              /* Noise energy level in each band                                      */
70     opus_int32                  inv_NL[ VAD_N_BANDS ];          /* Inverse noise energy level in each band                              */
71     opus_int32                  NoiseLevelBias[ VAD_N_BANDS ];  /* Noise level estimator bias/offset                                    */
72     opus_int32                  counter;                        /* Frame counter used in the initial phase                              */
73 } silk_VAD_state;
74
75 /* Variable cut-off low-pass filter state */
76 typedef struct {
77     opus_int32                   In_LP_State[ 2 ];           /* Low pass filter state */
78     opus_int32                   transition_frame_no;        /* Counter which is mapped to a cut-off frequency */
79     opus_int                     mode;                       /* Operating mode, <0: switch down, >0: switch up; 0: do nothing           */
80 } silk_LP_state;
81
82 /* Structure containing NLSF codebook */
83 typedef struct {
84     const opus_int16             nVectors;
85     const opus_int16             order;
86     const opus_int16             quantStepSize_Q16;
87     const opus_int16             invQuantStepSize_Q6;
88     const opus_uint8             *CB1_NLSF_Q8;
89     const opus_int16             *CB1_Wght_Q9;
90     const opus_uint8             *CB1_iCDF;
91     const opus_uint8             *pred_Q8;
92     const opus_uint8             *ec_sel;
93     const opus_uint8             *ec_iCDF;
94     const opus_uint8             *ec_Rates_Q5;
95     const opus_int16             *deltaMin_Q15;
96 } silk_NLSF_CB_struct;
97
98 typedef struct {
99     opus_int16                   pred_prev_Q13[ 2 ];
100     opus_int16                   sMid[ 2 ];
101     opus_int16                   sSide[ 2 ];
102     opus_int32                   mid_side_amp_Q0[ 4 ];
103     opus_int16                   smth_width_Q14;
104     opus_int16                   width_prev_Q14;
105     opus_int16                   silent_side_len;
106     opus_int8                    predIx[ MAX_FRAMES_PER_PACKET ][ 2 ][ 3 ];
107     opus_int8                    mid_only_flags[ MAX_FRAMES_PER_PACKET ];
108 } stereo_enc_state;
109
110 typedef struct {
111     opus_int16                   pred_prev_Q13[ 2 ];
112     opus_int16                   sMid[ 2 ];
113     opus_int16                   sSide[ 2 ];
114 } stereo_dec_state;
115
116 typedef struct {
117     opus_int8                    GainsIndices[ MAX_NB_SUBFR ];
118     opus_int8                    LTPIndex[ MAX_NB_SUBFR ];
119     opus_int8                    NLSFIndices[ MAX_LPC_ORDER + 1 ];
120     opus_int16                   lagIndex;
121     opus_int8                    contourIndex;
122     opus_int8                    signalType;
123     opus_int8                    quantOffsetType;
124     opus_int8                    NLSFInterpCoef_Q2;
125     opus_int8                    PERIndex;
126     opus_int8                    LTP_scaleIndex;
127     opus_int8                    Seed;
128 } SideInfoIndices;
129
130 /********************************/
131 /* Encoder state                */
132 /********************************/
133 typedef struct {
134     opus_int32                   In_HP_State[ 2 ];                  /* High pass filter state                                           */
135     opus_int32                   variable_HP_smth1_Q15;             /* State of first smoother                                          */
136     opus_int32                   variable_HP_smth2_Q15;             /* State of second smoother                                         */
137     silk_LP_state                sLP;                               /* Low pass filter state                                            */
138     silk_VAD_state               sVAD;                              /* Voice activity detector state                                    */
139     silk_nsq_state               sNSQ;                              /* Noise Shape Quantizer State                                      */
140     opus_int16                   prev_NLSFq_Q15[ MAX_LPC_ORDER ];   /* Previously quantized NLSF vector                                 */
141     opus_int                     speech_activity_Q8;                /* Speech activity                                                  */
142     opus_int                     allow_bandwidth_switch;            /* Flag indicating that switching of internal bandwidth is allowed  */
143     opus_int8                    LBRRprevLastGainIndex;
144     opus_int8                    prevSignalType;
145     opus_int                     prevLag;
146     opus_int                     pitch_LPC_win_length;
147     opus_int                     max_pitch_lag;                     /* Highest possible pitch lag (samples)                             */
148     opus_int32                   API_fs_Hz;                         /* API sampling frequency (Hz)                                      */
149     opus_int32                   prev_API_fs_Hz;                    /* Previous API sampling frequency (Hz)                             */
150     opus_int                     maxInternal_fs_Hz;                 /* Maximum internal sampling frequency (Hz)                         */
151     opus_int                     minInternal_fs_Hz;                 /* Minimum internal sampling frequency (Hz)                         */
152     opus_int                     desiredInternal_fs_Hz;             /* Soft request for internal sampling frequency (Hz)                */
153     opus_int                     fs_kHz;                            /* Internal sampling frequency (kHz)                                */
154     opus_int                     nb_subfr;                          /* Number of 5 ms subframes in a frame                              */
155     opus_int                     frame_length;                      /* Frame length (samples)                                           */
156     opus_int                     subfr_length;                      /* Subframe length (samples)                                        */
157     opus_int                     ltp_mem_length;                    /* Length of LTP memory                                             */
158     opus_int                     la_pitch;                          /* Look-ahead for pitch analysis (samples)                          */
159     opus_int                     la_shape;                          /* Look-ahead for noise shape analysis (samples)                    */
160     opus_int                     shapeWinLength;                    /* Window length for noise shape analysis (samples)                 */
161     opus_int32                   TargetRate_bps;                    /* Target bitrate (bps)                                             */
162     opus_int                     PacketSize_ms;                     /* Number of milliseconds to put in each packet                     */
163     opus_int                     PacketLoss_perc;                   /* Packet loss rate measured by farend                              */
164     opus_int32                   frameCounter;
165     opus_int                     Complexity;                        /* Complexity setting                                               */
166     opus_int                     nStatesDelayedDecision;            /* Number of states in delayed decision quantization                */
167     opus_int                     useInterpolatedNLSFs;              /* Flag for using NLSF interpolation                                */
168     opus_int                     shapingLPCOrder;                   /* Filter order for noise shaping filters                           */
169     opus_int                     predictLPCOrder;                   /* Filter order for prediction filters                              */
170     opus_int                     pitchEstimationComplexity;         /* Complexity level for pitch estimator                             */
171     opus_int                     pitchEstimationLPCOrder;           /* Whitening filter order for pitch estimator                       */
172     opus_int32                   pitchEstimationThreshold_Q16;      /* Threshold for pitch estimator                                    */
173     opus_int32                   sum_log_gain_Q7;                   /* Cumulative max prediction gain                                   */
174     opus_int                     NLSF_MSVQ_Survivors;               /* Number of survivors in NLSF MSVQ                                 */
175     opus_int                     first_frame_after_reset;           /* Flag for deactivating NLSF interpolation, pitch prediction       */
176     opus_int                     controlled_since_last_payload;     /* Flag for ensuring codec_control only runs once per packet        */
177     opus_int                     warping_Q16;                       /* Warping parameter for warped noise shaping                       */
178     opus_int                     useCBR;                            /* Flag to enable constant bitrate                                  */
179     opus_int                     prefillFlag;                       /* Flag to indicate that only buffers are prefilled, no coding      */
180     const opus_uint8             *pitch_lag_low_bits_iCDF;          /* Pointer to iCDF table for low bits of pitch lag index            */
181     const opus_uint8             *pitch_contour_iCDF;               /* Pointer to iCDF table for pitch contour index                    */
182     const silk_NLSF_CB_struct    *psNLSF_CB;                        /* Pointer to NLSF codebook                                         */
183     opus_int                     input_quality_bands_Q15[ VAD_N_BANDS ];
184     opus_int                     input_tilt_Q15;
185     opus_int                     SNR_dB_Q7;                         /* Quality setting                                                  */
186
187     opus_int8                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
188     opus_int8                    LBRR_flag;
189     opus_int                     LBRR_flags[ MAX_FRAMES_PER_PACKET ];
190
191     SideInfoIndices              indices;
192     opus_int8                    pulses[ MAX_FRAME_LENGTH ];
193
194     int                          arch;
195
196     /* Input/output buffering */
197     opus_int16                   inputBuf[ MAX_FRAME_LENGTH + 2 ];  /* Buffer containing input signal                                   */
198     opus_int                     inputBufIx;
199     opus_int                     nFramesPerPacket;
200     opus_int                     nFramesEncoded;                    /* Number of frames analyzed in current packet                      */
201
202     opus_int                     nChannelsAPI;
203     opus_int                     nChannelsInternal;
204     opus_int                     channelNb;
205
206     /* Parameters For LTP scaling Control */
207     opus_int                     frames_since_onset;
208
209     /* Specifically for entropy coding */
210     opus_int                     ec_prevSignalType;
211     opus_int16                   ec_prevLagIndex;
212
213     silk_resampler_state_struct resampler_state;
214
215     /* DTX */
216     opus_int                     useDTX;                            /* Flag to enable DTX                                               */
217     opus_int                     inDTX;                             /* Flag to signal DTX period                                        */
218     opus_int                     noSpeechCounter;                   /* Counts concecutive nonactive frames, used by DTX                 */
219
220     /* Inband Low Bitrate Redundancy (LBRR) data */
221     opus_int                     useInBandFEC;                      /* Saves the API setting for query                                  */
222     opus_int                     LBRR_enabled;                      /* Depends on useInBandFRC, bitrate and packet loss rate            */
223     opus_int                     LBRR_GainIncreases;                /* Gains increment for coding LBRR frames                           */
224     SideInfoIndices              indices_LBRR[ MAX_FRAMES_PER_PACKET ];
225     opus_int8                    pulses_LBRR[ MAX_FRAMES_PER_PACKET ][ MAX_FRAME_LENGTH ];
226 } silk_encoder_state;
227
228
229 /* Struct for Packet Loss Concealment */
230 typedef struct {
231     opus_int32                  pitchL_Q8;                          /* Pitch lag to use for voiced concealment                          */
232     opus_int16                  LTPCoef_Q14[ LTP_ORDER ];           /* LTP coeficients to use for voiced concealment                    */
233     opus_int16                  prevLPC_Q12[ MAX_LPC_ORDER ];
234     opus_int                    last_frame_lost;                    /* Was previous frame lost                                          */
235     opus_int32                  rand_seed;                          /* Seed for unvoiced signal generation                              */
236     opus_int16                  randScale_Q14;                      /* Scaling of unvoiced random signal                                */
237     opus_int32                  conc_energy;
238     opus_int                    conc_energy_shift;
239     opus_int16                  prevLTP_scale_Q14;
240     opus_int32                  prevGain_Q16[ 2 ];
241     opus_int                    fs_kHz;
242     opus_int                    nb_subfr;
243     opus_int                    subfr_length;
244 } silk_PLC_struct;
245
246 /* Struct for CNG */
247 typedef struct {
248     opus_int32                  CNG_exc_buf_Q14[ MAX_FRAME_LENGTH ];
249     opus_int16                  CNG_smth_NLSF_Q15[ MAX_LPC_ORDER ];
250     opus_int32                  CNG_synth_state[ MAX_LPC_ORDER ];
251     opus_int32                  CNG_smth_Gain_Q16;
252     opus_int32                  rand_seed;
253     opus_int                    fs_kHz;
254 } silk_CNG_struct;
255
256 /********************************/
257 /* Decoder state                */
258 /********************************/
259 typedef struct {
260     opus_int32                  prev_gain_Q16;
261     opus_int32                  exc_Q14[ MAX_FRAME_LENGTH ];
262     opus_int32                  sLPC_Q14_buf[ MAX_LPC_ORDER ];
263     opus_int16                  outBuf[ MAX_FRAME_LENGTH + 2 * MAX_SUB_FRAME_LENGTH ];  /* Buffer for output signal                     */
264     opus_int                    lagPrev;                            /* Previous Lag                                                     */
265     opus_int8                   LastGainIndex;                      /* Previous gain index                                              */
266     opus_int                    fs_kHz;                             /* Sampling frequency in kHz                                        */
267     opus_int32                  fs_API_hz;                          /* API sample frequency (Hz)                                        */
268     opus_int                    nb_subfr;                           /* Number of 5 ms subframes in a frame                              */
269     opus_int                    frame_length;                       /* Frame length (samples)                                           */
270     opus_int                    subfr_length;                       /* Subframe length (samples)                                        */
271     opus_int                    ltp_mem_length;                     /* Length of LTP memory                                             */
272     opus_int                    LPC_order;                          /* LPC order                                                        */
273     opus_int16                  prevNLSF_Q15[ MAX_LPC_ORDER ];      /* Used to interpolate LSFs                                         */
274     opus_int                    first_frame_after_reset;            /* Flag for deactivating NLSF interpolation                         */
275     const opus_uint8            *pitch_lag_low_bits_iCDF;           /* Pointer to iCDF table for low bits of pitch lag index            */
276     const opus_uint8            *pitch_contour_iCDF;                /* Pointer to iCDF table for pitch contour index                    */
277
278     /* For buffering payload in case of more frames per packet */
279     opus_int                    nFramesDecoded;
280     opus_int                    nFramesPerPacket;
281
282     /* Specifically for entropy coding */
283     opus_int                    ec_prevSignalType;
284     opus_int16                  ec_prevLagIndex;
285
286     opus_int                    VAD_flags[ MAX_FRAMES_PER_PACKET ];
287     opus_int                    LBRR_flag;
288     opus_int                    LBRR_flags[ MAX_FRAMES_PER_PACKET ];
289
290     silk_resampler_state_struct resampler_state;
291
292     const silk_NLSF_CB_struct   *psNLSF_CB;                         /* Pointer to NLSF codebook                                         */
293
294     /* Quantization indices */
295     SideInfoIndices             indices;
296
297     /* CNG state */
298     silk_CNG_struct             sCNG;
299
300     /* Stuff used for PLC */
301     opus_int                    lossCnt;
302     opus_int                    prevSignalType;
303
304     silk_PLC_struct sPLC;
305
306 } silk_decoder_state;
307
308 /************************/
309 /* Decoder control      */
310 /************************/
311 typedef struct {
312     /* Prediction and coding parameters */
313     opus_int                    pitchL[ MAX_NB_SUBFR ];
314     opus_int32                  Gains_Q16[ MAX_NB_SUBFR ];
315     /* Holds interpolated and final coefficients, 4-byte aligned */
316     silk_DWORD_ALIGN opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ];
317     opus_int16                  LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ];
318     opus_int                    LTP_scale_Q14;
319 } silk_decoder_control;
320
321
322 #ifdef __cplusplus
323 }
324 #endif
325
326 #endif