Implements glitchless switching between SILK bandwidths
[opus.git] / silk / control_codec.c
1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without
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7 this list of conditions and the following disclaimer.
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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 Skype Limited, nor the names of specific
12 contributors, may be used to endorse or promote products derived from
13 this software without specific prior written permission.
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16 CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
17 BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
18 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 #ifdef FIXED_POINT
32 #include "main_FIX.h"
33 #define silk_encoder_state_Fxx      silk_encoder_state_FIX
34 #else
35 #include "main_FLP.h"
36 #define silk_encoder_state_Fxx      silk_encoder_state_FLP
37 #endif
38 #include "tuning_parameters.h"
39
40
41 static const opus_int enc_delay_matrix[3][5] = {
42 /*SILK API 8  12  16  24  48 */
43 /* 8 */   {5,  0,  3,  4,  8},
44 /*12 */   {0,  6,  0,  0,  0},
45 /*16 */   {4,  5, 11,  5, 18}
46 };
47
48 opus_int silk_setup_resamplers(
49     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
50     opus_int                         fs_kHz              /* I                        */
51 );
52
53 opus_int silk_setup_fs(
54     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
55     opus_int                         fs_kHz,             /* I                        */
56     opus_int                         PacketSize_ms       /* I                        */
57 );
58
59 opus_int silk_setup_complexity(
60     silk_encoder_state              *psEncC,            /* I/O                      */
61     opus_int                         Complexity          /* I                        */
62 );
63
64 static inline opus_int silk_setup_LBRR(
65     silk_encoder_state              *psEncC,            /* I/O                      */
66     const opus_int32                 TargetRate_bps      /* I                        */
67 );
68
69
70 /* Control encoder */
71 opus_int silk_control_encoder(
72     silk_encoder_state_Fxx          *psEnc,             /* I/O  Pointer to Silk encoder state           */
73     silk_EncControlStruct           *encControl,        /* I:   Control structure                       */
74     const opus_int32                 TargetRate_bps,     /* I    Target max bitrate (bps)                */
75     const opus_int                   allow_bw_switch,    /* I    Flag to allow switching audio bandwidth */
76     const opus_int                   channelNb,           /* I    Channel number                          */
77     const opus_int                   force_fs_kHz
78 )
79 {
80     opus_int   fs_kHz, ret = 0;
81
82     psEnc->sCmn.useDTX                 = encControl->useDTX;
83     psEnc->sCmn.useCBR                 = encControl->useCBR;
84     psEnc->sCmn.API_fs_Hz              = encControl->API_sampleRate;
85     psEnc->sCmn.maxInternal_fs_Hz      = encControl->maxInternalSampleRate;
86     psEnc->sCmn.minInternal_fs_Hz      = encControl->minInternalSampleRate;
87     psEnc->sCmn.desiredInternal_fs_Hz  = encControl->desiredInternalSampleRate;
88     psEnc->sCmn.useInBandFEC           = encControl->useInBandFEC;
89     psEnc->sCmn.nChannelsAPI           = encControl->nChannelsAPI;
90     psEnc->sCmn.nChannelsInternal      = encControl->nChannelsInternal;
91     psEnc->sCmn.allow_bandwidth_switch = allow_bw_switch;
92     psEnc->sCmn.channelNb              = channelNb;
93
94     if( psEnc->sCmn.controlled_since_last_payload != 0 && psEnc->sCmn.prefillFlag == 0 ) {
95         if( psEnc->sCmn.API_fs_Hz != psEnc->sCmn.prev_API_fs_Hz && psEnc->sCmn.fs_kHz > 0 ) {
96             /* Change in API sampling rate in the middle of encoding a packet */
97             ret += silk_setup_resamplers( psEnc, psEnc->sCmn.fs_kHz );
98         }
99         return ret;
100     }
101
102     /* Beyond this point we know that there are no previously coded frames in the payload buffer */
103
104     /********************************************/
105     /* Determine internal sampling rate         */
106     /********************************************/
107     fs_kHz = silk_control_audio_bandwidth( &psEnc->sCmn, encControl );
108     if (force_fs_kHz)
109        fs_kHz = force_fs_kHz;
110     /********************************************/
111     /* Prepare resampler and buffered data      */
112     /********************************************/
113     ret += silk_setup_resamplers( psEnc, fs_kHz );
114
115     /********************************************/
116     /* Set internal sampling frequency          */
117     /********************************************/
118     ret += silk_setup_fs( psEnc, fs_kHz, encControl->payloadSize_ms );
119
120     /********************************************/
121     /* Set encoding complexity                  */
122     /********************************************/
123     ret += silk_setup_complexity( &psEnc->sCmn, encControl->complexity  );
124
125     /********************************************/
126     /* Set packet loss rate measured by farend  */
127     /********************************************/
128     psEnc->sCmn.PacketLoss_perc = encControl->packetLossPercentage;
129
130     /********************************************/
131     /* Set LBRR usage                           */
132     /********************************************/
133     ret += silk_setup_LBRR( &psEnc->sCmn, TargetRate_bps );
134
135     psEnc->sCmn.controlled_since_last_payload = 1;
136
137     return ret;
138 }
139
140 opus_int silk_setup_resamplers(
141     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
142     opus_int                         fs_kHz              /* I                        */
143 )
144 {
145     opus_int   ret = SILK_NO_ERROR;
146     opus_int32 nSamples_temp;
147
148     if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz )
149     {
150         if( psEnc->sCmn.fs_kHz == 0 ) {
151             /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
152             ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000 );
153         } else {
154             /* Allocate worst case space for temporary upsampling, 8 to 48 kHz, so a factor 6 */
155             opus_int16 x_buf_API_fs_Hz[ ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * MAX_API_FS_KHZ ];
156             silk_resampler_state_struct  temp_resampler_state;
157 #ifdef FIXED_POINT
158             opus_int16 *x_bufFIX = psEnc->x_buf;
159 #else
160             opus_int16 x_bufFIX[ 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ];
161 #endif
162
163             nSamples_temp = silk_LSHIFT( psEnc->sCmn.frame_length, 1 ) + LA_SHAPE_MS * psEnc->sCmn.fs_kHz;
164
165 #ifndef FIXED_POINT
166             silk_float2short_array( x_bufFIX, psEnc->x_buf, nSamples_temp );
167 #endif
168
169             /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */
170             ret += silk_resampler_init( &temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz );
171
172             /* Temporary resampling of x_buf data to API_fs_Hz */
173             ret += silk_resampler( &temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, nSamples_temp );
174
175             /* Calculate number of samples that has been temporarily upsampled */
176             nSamples_temp = silk_DIV32_16( nSamples_temp * psEnc->sCmn.API_fs_Hz, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ) );
177
178             /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
179             ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ) );
180
181             /* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */
182             ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, nSamples_temp );
183
184 #ifndef FIXED_POINT
185             silk_short2float_array( psEnc->x_buf, x_bufFIX, ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * fs_kHz );
186 #endif
187         }
188     }
189
190     psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz;
191
192     return ret;
193 }
194
195 opus_int silk_setup_fs(
196     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
197     opus_int                         fs_kHz,             /* I                        */
198     opus_int                         PacketSize_ms       /* I                        */
199 )
200 {
201     opus_int ret = SILK_NO_ERROR;
202
203     /* Set packet size */
204     if( PacketSize_ms != psEnc->sCmn.PacketSize_ms ) {
205         if( ( PacketSize_ms !=  10 ) &&
206             ( PacketSize_ms !=  20 ) &&
207             ( PacketSize_ms !=  40 ) &&
208             ( PacketSize_ms !=  60 ) ) {
209             ret = SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
210         }
211         if( PacketSize_ms <= 10 ) {
212             psEnc->sCmn.nFramesPerPacket = 1;
213             psEnc->sCmn.nb_subfr = PacketSize_ms == 10 ? 2 : 1;
214             psEnc->sCmn.frame_length = silk_SMULBB( PacketSize_ms, fs_kHz );
215             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
216             if( psEnc->sCmn.fs_kHz == 8 ) {
217                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
218             } else {
219                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
220             }
221         } else {
222             psEnc->sCmn.nFramesPerPacket = silk_DIV32_16( PacketSize_ms, MAX_FRAME_LENGTH_MS );
223             psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
224             psEnc->sCmn.frame_length = silk_SMULBB( 20, fs_kHz );
225             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
226             if( psEnc->sCmn.fs_kHz == 8 ) {
227                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
228             } else {
229                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
230             }
231         }
232         psEnc->sCmn.PacketSize_ms  = PacketSize_ms;
233         psEnc->sCmn.TargetRate_bps = 0;         /* trigger new SNR computation */
234     }
235
236     psEnc->sCmn.delay = enc_delay_matrix[rateID(fs_kHz*1000)][rateID(psEnc->sCmn.API_fs_Hz)];
237     silk_assert(psEnc->sCmn.delay <= MAX_ENCODER_DELAY);
238
239     /* Set internal sampling frequency */
240     silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
241     silk_assert( psEnc->sCmn.nb_subfr == 2 || psEnc->sCmn.nb_subfr == 4 );
242     if( psEnc->sCmn.fs_kHz != fs_kHz ) {
243         /* reset part of the state */
244         silk_memset( &psEnc->sShape,               0, sizeof( psEnc->sShape ) );
245         silk_memset( &psEnc->sPrefilt,             0, sizeof( psEnc->sPrefilt ) );
246         silk_memset( &psEnc->sCmn.sNSQ,            0, sizeof( psEnc->sCmn.sNSQ ) );
247         silk_memset( psEnc->sCmn.prev_NLSFq_Q15,   0, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
248         silk_memset( &psEnc->sCmn.sLP.In_LP_State, 0, sizeof( psEnc->sCmn.sLP.In_LP_State ) );
249         psEnc->sCmn.inputBufIx                  = 0;
250         psEnc->sCmn.nFramesEncoded              = 0;
251         psEnc->sCmn.TargetRate_bps              = 0;     /* trigger new SNR computation */
252
253         /* Initialize non-zero parameters */
254         psEnc->sCmn.prevLag                     = 100;
255         psEnc->sCmn.first_frame_after_reset     = 1;
256         psEnc->sPrefilt.lagPrev                 = 100;
257         psEnc->sShape.LastGainIndex             = 10;
258         psEnc->sCmn.sNSQ.lagPrev                = 100;
259         psEnc->sCmn.sNSQ.prev_inv_gain_Q16      = 65536;
260         psEnc->sCmn.prevSignalType              = TYPE_NO_VOICE_ACTIVITY;
261
262         psEnc->sCmn.fs_kHz = fs_kHz;
263         if( psEnc->sCmn.fs_kHz == 8 ) {
264             if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
265                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
266             } else {
267                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
268             }
269         } else {
270             if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
271                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
272             } else {
273                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
274             }
275         }
276         if( psEnc->sCmn.fs_kHz == 8 || psEnc->sCmn.fs_kHz == 12 ) {
277             psEnc->sCmn.predictLPCOrder = MIN_LPC_ORDER;
278             psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_NB_MB;
279         } else {
280             psEnc->sCmn.predictLPCOrder = MAX_LPC_ORDER;
281             psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_WB;
282         }
283         psEnc->sCmn.subfr_length   = SUB_FRAME_LENGTH_MS * fs_kHz;
284         psEnc->sCmn.frame_length   = silk_SMULBB( psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
285         psEnc->sCmn.ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
286         psEnc->sCmn.la_pitch       = silk_SMULBB( LA_PITCH_MS, fs_kHz );
287         psEnc->sCmn.max_pitch_lag  = silk_SMULBB( 18, fs_kHz );
288         if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
289             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
290         } else {
291             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
292         }
293         if( psEnc->sCmn.fs_kHz == 16 ) {
294             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_WB, 9 );
295             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
296         } else if( psEnc->sCmn.fs_kHz == 12 ) {
297             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_MB, 9 );
298             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
299         } else {
300             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_NB, 9 );
301             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
302         }
303     }
304
305     /* Check that settings are valid */
306     silk_assert( ( psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr ) == psEnc->sCmn.frame_length );
307
308     return ret;
309 }
310
311 opus_int silk_setup_complexity(
312     silk_encoder_state              *psEncC,            /* I/O                      */
313     opus_int                         Complexity          /* I                        */
314 )
315 {
316     opus_int ret = 0;
317
318     /* Set encoding complexity */
319     silk_assert( Complexity >= 0 && Complexity <= 10 );
320     if( Complexity < 2 ) {
321         psEncC->pitchEstimationComplexity       = SILK_PE_MIN_COMPLEX;
322         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.8, 16 );
323         psEncC->pitchEstimationLPCOrder         = 6;
324         psEncC->shapingLPCOrder                 = 8;
325         psEncC->la_shape                        = 3 * psEncC->fs_kHz;
326         psEncC->nStatesDelayedDecision          = 1;
327         psEncC->useInterpolatedNLSFs            = 0;
328         psEncC->LTPQuantLowComplexity           = 1;
329         psEncC->NLSF_MSVQ_Survivors             = 2;
330         psEncC->warping_Q16                     = 0;
331     } else if( Complexity < 4 ) {
332         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
333         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.76, 16 );
334         psEncC->pitchEstimationLPCOrder         = 8;
335         psEncC->shapingLPCOrder                 = 10;
336         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
337         psEncC->nStatesDelayedDecision          = 1;
338         psEncC->useInterpolatedNLSFs            = 1;
339         psEncC->LTPQuantLowComplexity           = 0;
340         psEncC->NLSF_MSVQ_Survivors             = 4;
341         psEncC->warping_Q16                     = 0;
342     } else if( Complexity < 6 ) {
343         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
344         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.74, 16 );
345         psEncC->pitchEstimationLPCOrder         = 10;
346         psEncC->shapingLPCOrder                 = 12;
347         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
348         psEncC->nStatesDelayedDecision          = 2;
349         psEncC->useInterpolatedNLSFs            = 0;
350         psEncC->LTPQuantLowComplexity           = 0;
351         psEncC->NLSF_MSVQ_Survivors             = 8;
352         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
353     } else if( Complexity < 8 ) {
354         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
355         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.72, 16 );
356         psEncC->pitchEstimationLPCOrder         = 12;
357         psEncC->shapingLPCOrder                 = 14;
358         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
359         psEncC->nStatesDelayedDecision          = 3;
360         psEncC->useInterpolatedNLSFs            = 0;
361         psEncC->LTPQuantLowComplexity           = 0;
362         psEncC->NLSF_MSVQ_Survivors             = 16;
363         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
364     } else {
365         psEncC->pitchEstimationComplexity       = SILK_PE_MAX_COMPLEX;
366         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.7, 16 );
367         psEncC->pitchEstimationLPCOrder         = 16;
368         psEncC->shapingLPCOrder                 = 16;
369         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
370         psEncC->nStatesDelayedDecision          = MAX_DEL_DEC_STATES;
371         psEncC->useInterpolatedNLSFs            = 1;
372         psEncC->LTPQuantLowComplexity           = 0;
373         psEncC->NLSF_MSVQ_Survivors             = 32;
374         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
375     }
376
377     /* Do not allow higher pitch estimation LPC order than predict LPC order */
378     psEncC->pitchEstimationLPCOrder = silk_min_int( psEncC->pitchEstimationLPCOrder, psEncC->predictLPCOrder );
379     psEncC->shapeWinLength          = SUB_FRAME_LENGTH_MS * psEncC->fs_kHz + 2 * psEncC->la_shape;
380     psEncC->Complexity              = Complexity;
381
382     silk_assert( psEncC->pitchEstimationLPCOrder <= MAX_FIND_PITCH_LPC_ORDER );
383     silk_assert( psEncC->shapingLPCOrder         <= MAX_SHAPE_LPC_ORDER      );
384     silk_assert( psEncC->nStatesDelayedDecision  <= MAX_DEL_DEC_STATES       );
385     silk_assert( psEncC->warping_Q16             <= 32767                    );
386     silk_assert( psEncC->la_shape                <= LA_SHAPE_MAX             );
387     silk_assert( psEncC->shapeWinLength          <= SHAPE_LPC_WIN_MAX        );
388     silk_assert( psEncC->NLSF_MSVQ_Survivors     <= NLSF_VQ_MAX_SURVIVORS    );
389
390     return ret;
391 }
392
393 static inline opus_int silk_setup_LBRR(
394     silk_encoder_state          *psEncC,            /* I/O                      */
395     const opus_int32                 TargetRate_bps      /* I                        */
396 )
397 {
398     opus_int   ret = SILK_NO_ERROR;
399     opus_int32 LBRR_rate_thres_bps;
400
401     psEncC->LBRR_enabled = 0;
402     if( psEncC->useInBandFEC && psEncC->PacketLoss_perc > 0 ) {
403         if( psEncC->fs_kHz == 8 ) {
404             LBRR_rate_thres_bps = LBRR_NB_MIN_RATE_BPS;
405         } else if( psEncC->fs_kHz == 12 ) {
406             LBRR_rate_thres_bps = LBRR_MB_MIN_RATE_BPS;
407         } else {
408             LBRR_rate_thres_bps = LBRR_WB_MIN_RATE_BPS;
409         }
410         LBRR_rate_thres_bps = silk_SMULWB( silk_MUL( LBRR_rate_thres_bps, 125 - silk_min( psEncC->PacketLoss_perc, 25 ) ), SILK_FIX_CONST( 0.01, 16 ) );
411
412         if( TargetRate_bps > LBRR_rate_thres_bps ) {
413             /* Set gain increase for coding LBRR excitation */
414             psEncC->LBRR_enabled = 1;
415             psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.4, 16 ) ), 2 );
416         }
417     }
418
419     return ret;
420 }