Reformatting changes with an update to the MSVC project files
[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
4 modification, (subject to the limitations in the disclaimer below)
5 are permitted provided that the following conditions 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 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.
14 NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
15 BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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,
20 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
22 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
23 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 #include "pitch_est_defines.h"
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     /********************************************/
112     /* Prepare resampler and buffered data      */
113     /********************************************/
114     ret += silk_setup_resamplers( psEnc, fs_kHz );
115
116     /********************************************/
117     /* Set internal sampling frequency          */
118     /********************************************/
119     ret += silk_setup_fs( psEnc, fs_kHz, encControl->payloadSize_ms );
120
121     /********************************************/
122     /* Set encoding complexity                  */
123     /********************************************/
124     ret += silk_setup_complexity( &psEnc->sCmn, encControl->complexity  );
125
126     /********************************************/
127     /* Set packet loss rate measured by farend  */
128     /********************************************/
129     psEnc->sCmn.PacketLoss_perc = encControl->packetLossPercentage;
130
131     /********************************************/
132     /* Set LBRR usage                           */
133     /********************************************/
134     ret += silk_setup_LBRR( &psEnc->sCmn, TargetRate_bps );
135
136     psEnc->sCmn.controlled_since_last_payload = 1;
137
138     return ret;
139 }
140
141 opus_int silk_setup_resamplers(
142     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
143     opus_int                         fs_kHz              /* I                        */
144 )
145 {
146     opus_int   ret = SILK_NO_ERROR;
147     opus_int32 nSamples_temp;
148
149     if( psEnc->sCmn.fs_kHz != fs_kHz || psEnc->sCmn.prev_API_fs_Hz != psEnc->sCmn.API_fs_Hz )
150     {
151         if( psEnc->sCmn.fs_kHz == 0 ) {
152             /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
153             ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, fs_kHz * 1000 );
154         } else {
155             /* Allocate worst case space for temporary upsampling, 8 to 48 kHz, so a factor 6 */
156             opus_int16 x_buf_API_fs_Hz[ ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * MAX_API_FS_KHZ ];
157             silk_resampler_state_struct  temp_resampler_state;
158 #ifdef FIXED_POINT
159             opus_int16 *x_bufFIX = psEnc->x_buf;
160 #else
161             opus_int16 x_bufFIX[ 2 * MAX_FRAME_LENGTH + LA_SHAPE_MAX ];
162 #endif
163
164             nSamples_temp = silk_LSHIFT( psEnc->sCmn.frame_length, 1 ) + LA_SHAPE_MS * psEnc->sCmn.fs_kHz;
165
166 #ifndef FIXED_POINT
167             silk_float2short_array( x_bufFIX, psEnc->x_buf, nSamples_temp );
168 #endif
169
170             /* Initialize resampler for temporary resampling of x_buf data to API_fs_Hz */
171             ret += silk_resampler_init( &temp_resampler_state, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ), psEnc->sCmn.API_fs_Hz );
172
173             /* Temporary resampling of x_buf data to API_fs_Hz */
174             ret += silk_resampler( &temp_resampler_state, x_buf_API_fs_Hz, x_bufFIX, nSamples_temp );
175
176             /* Calculate number of samples that has been temporarily upsampled */
177             nSamples_temp = silk_DIV32_16( nSamples_temp * psEnc->sCmn.API_fs_Hz, silk_SMULBB( psEnc->sCmn.fs_kHz, 1000 ) );
178
179             /* Initialize the resampler for enc_API.c preparing resampling from API_fs_Hz to fs_kHz */
180             ret += silk_resampler_init( &psEnc->sCmn.resampler_state, psEnc->sCmn.API_fs_Hz, silk_SMULBB( fs_kHz, 1000 ) );
181
182             /* Correct resampler state by resampling buffered data from API_fs_Hz to fs_kHz */
183             ret += silk_resampler( &psEnc->sCmn.resampler_state, x_bufFIX, x_buf_API_fs_Hz, nSamples_temp );
184
185 #ifndef FIXED_POINT
186             silk_short2float_array( psEnc->x_buf, x_bufFIX, ( 2 * MAX_FRAME_LENGTH_MS + LA_SHAPE_MS ) * fs_kHz );
187 #endif
188         }
189     }
190
191     psEnc->sCmn.prev_API_fs_Hz = psEnc->sCmn.API_fs_Hz;
192
193     return ret;
194 }
195
196 opus_int silk_setup_fs(
197     silk_encoder_state_Fxx          *psEnc,             /* I/O                      */
198     opus_int                        fs_kHz,             /* I                        */
199     opus_int                        PacketSize_ms       /* I                        */
200 )
201 {
202     opus_int ret = SILK_NO_ERROR;
203
204     /* Set packet size */
205     if( PacketSize_ms != psEnc->sCmn.PacketSize_ms ) {
206         if( ( PacketSize_ms !=  10 ) &&
207             ( PacketSize_ms !=  20 ) &&
208             ( PacketSize_ms !=  40 ) &&
209             ( PacketSize_ms !=  60 ) ) {
210             ret = SILK_ENC_PACKET_SIZE_NOT_SUPPORTED;
211         }
212         if( PacketSize_ms <= 10 ) {
213             psEnc->sCmn.nFramesPerPacket = 1;
214             psEnc->sCmn.nb_subfr = PacketSize_ms == 10 ? 2 : 1;
215             psEnc->sCmn.frame_length = silk_SMULBB( PacketSize_ms, fs_kHz );
216             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
217             if( psEnc->sCmn.fs_kHz == 8 ) {
218                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
219             } else {
220                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
221             }
222         } else {
223             psEnc->sCmn.nFramesPerPacket = silk_DIV32_16( PacketSize_ms, MAX_FRAME_LENGTH_MS );
224             psEnc->sCmn.nb_subfr = MAX_NB_SUBFR;
225             psEnc->sCmn.frame_length = silk_SMULBB( 20, fs_kHz );
226             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
227             if( psEnc->sCmn.fs_kHz == 8 ) {
228                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
229             } else {
230                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
231             }
232         }
233         psEnc->sCmn.PacketSize_ms  = PacketSize_ms;
234         psEnc->sCmn.TargetRate_bps = 0;         /* trigger new SNR computation */
235     }
236
237     psEnc->sCmn.delay = enc_delay_matrix[rateID(fs_kHz*1000)][rateID(psEnc->sCmn.API_fs_Hz)];
238     silk_assert(psEnc->sCmn.delay <= MAX_ENCODER_DELAY);
239
240     /* Set internal sampling frequency */
241     silk_assert( fs_kHz == 8 || fs_kHz == 12 || fs_kHz == 16 );
242     silk_assert( psEnc->sCmn.nb_subfr == 2 || psEnc->sCmn.nb_subfr == 4 );
243     if( psEnc->sCmn.fs_kHz != fs_kHz ) {
244         /* reset part of the state */
245         silk_memset( &psEnc->sShape,               0, sizeof( psEnc->sShape ) );
246         silk_memset( &psEnc->sPrefilt,             0, sizeof( psEnc->sPrefilt ) );
247         silk_memset( &psEnc->sCmn.sNSQ,            0, sizeof( psEnc->sCmn.sNSQ ) );
248         silk_memset( psEnc->sCmn.prev_NLSFq_Q15,   0, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
249         silk_memset( &psEnc->sCmn.sLP.In_LP_State, 0, sizeof( psEnc->sCmn.sLP.In_LP_State ) );
250         psEnc->sCmn.inputBufIx                  = 0;
251         psEnc->sCmn.nFramesEncoded              = 0;
252         psEnc->sCmn.TargetRate_bps              = 0;     /* trigger new SNR computation */
253
254         /* Initialize non-zero parameters */
255         psEnc->sCmn.prevLag                     = 100;
256         psEnc->sCmn.first_frame_after_reset     = 1;
257         psEnc->sPrefilt.lagPrev                 = 100;
258         psEnc->sShape.LastGainIndex             = 10;
259         psEnc->sCmn.sNSQ.lagPrev                = 100;
260         psEnc->sCmn.sNSQ.prev_inv_gain_Q16      = 65536;
261         psEnc->sCmn.prevSignalType              = TYPE_NO_VOICE_ACTIVITY;
262
263         psEnc->sCmn.fs_kHz = fs_kHz;
264         if( psEnc->sCmn.fs_kHz == 8 ) {
265             if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
266                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_NB_iCDF;
267             } else {
268                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_NB_iCDF;
269             }
270         } else {
271             if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
272                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_iCDF;
273             } else {
274                 psEnc->sCmn.pitch_contour_iCDF = silk_pitch_contour_10_ms_iCDF;
275             }
276         }
277         if( psEnc->sCmn.fs_kHz == 8 || psEnc->sCmn.fs_kHz == 12 ) {
278             psEnc->sCmn.predictLPCOrder = MIN_LPC_ORDER;
279             psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_NB_MB;
280         } else {
281             psEnc->sCmn.predictLPCOrder = MAX_LPC_ORDER;
282             psEnc->sCmn.psNLSF_CB  = &silk_NLSF_CB_WB;
283         }
284         psEnc->sCmn.subfr_length   = SUB_FRAME_LENGTH_MS * fs_kHz;
285         psEnc->sCmn.frame_length   = silk_SMULBB( psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
286         psEnc->sCmn.ltp_mem_length = silk_SMULBB( LTP_MEM_LENGTH_MS, fs_kHz );
287         psEnc->sCmn.la_pitch       = silk_SMULBB( LA_PITCH_MS, fs_kHz );
288         psEnc->sCmn.max_pitch_lag  = silk_SMULBB( 18, fs_kHz );
289         if( psEnc->sCmn.nb_subfr == MAX_NB_SUBFR ) {
290             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS, fs_kHz );
291         } else {
292             psEnc->sCmn.pitch_LPC_win_length = silk_SMULBB( FIND_PITCH_LPC_WIN_MS_2_SF, fs_kHz );
293         }
294         if( psEnc->sCmn.fs_kHz == 16 ) {
295             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_WB, 9 );
296             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform8_iCDF;
297         } else if( psEnc->sCmn.fs_kHz == 12 ) {
298             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_MB, 9 );
299             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform6_iCDF;
300         } else {
301             psEnc->sCmn.mu_LTP_Q9 = SILK_FIX_CONST( MU_LTP_QUANT_NB, 9 );
302             psEnc->sCmn.pitch_lag_low_bits_iCDF = silk_uniform4_iCDF;
303         }
304     }
305
306     /* Check that settings are valid */
307     silk_assert( ( psEnc->sCmn.subfr_length * psEnc->sCmn.nb_subfr ) == psEnc->sCmn.frame_length );
308
309     return ret;
310 }
311
312 opus_int silk_setup_complexity(
313     silk_encoder_state              *psEncC,            /* I/O                      */
314     opus_int                        Complexity          /* I                        */
315 )
316 {
317     opus_int ret = 0;
318
319     /* Set encoding complexity */
320     silk_assert( Complexity >= 0 && Complexity <= 10 );
321     if( Complexity < 2 ) {
322         psEncC->pitchEstimationComplexity       = SILK_PE_MIN_COMPLEX;
323         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.8, 16 );
324         psEncC->pitchEstimationLPCOrder         = 6;
325         psEncC->shapingLPCOrder                 = 8;
326         psEncC->la_shape                        = 3 * psEncC->fs_kHz;
327         psEncC->nStatesDelayedDecision          = 1;
328         psEncC->useInterpolatedNLSFs            = 0;
329         psEncC->LTPQuantLowComplexity           = 1;
330         psEncC->NLSF_MSVQ_Survivors             = 2;
331         psEncC->warping_Q16                     = 0;
332     } else if( Complexity < 4 ) {
333         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
334         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.76, 16 );
335         psEncC->pitchEstimationLPCOrder         = 8;
336         psEncC->shapingLPCOrder                 = 10;
337         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
338         psEncC->nStatesDelayedDecision          = 1;
339         psEncC->useInterpolatedNLSFs            = 1;
340         psEncC->LTPQuantLowComplexity           = 0;
341         psEncC->NLSF_MSVQ_Survivors             = 4;
342         psEncC->warping_Q16                     = 0;
343     } else if( Complexity < 6 ) {
344         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
345         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.74, 16 );
346         psEncC->pitchEstimationLPCOrder         = 10;
347         psEncC->shapingLPCOrder                 = 12;
348         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
349         psEncC->nStatesDelayedDecision          = 2;
350         psEncC->useInterpolatedNLSFs            = 0;
351         psEncC->LTPQuantLowComplexity           = 0;
352         psEncC->NLSF_MSVQ_Survivors             = 8;
353         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
354     } else if( Complexity < 8 ) {
355         psEncC->pitchEstimationComplexity       = SILK_PE_MID_COMPLEX;
356         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.72, 16 );
357         psEncC->pitchEstimationLPCOrder         = 12;
358         psEncC->shapingLPCOrder                 = 14;
359         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
360         psEncC->nStatesDelayedDecision          = 3;
361         psEncC->useInterpolatedNLSFs            = 0;
362         psEncC->LTPQuantLowComplexity           = 0;
363         psEncC->NLSF_MSVQ_Survivors             = 16;
364         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
365     } else {
366         psEncC->pitchEstimationComplexity       = SILK_PE_MAX_COMPLEX;
367         psEncC->pitchEstimationThreshold_Q16    = SILK_FIX_CONST( 0.7, 16 );
368         psEncC->pitchEstimationLPCOrder         = 16;
369         psEncC->shapingLPCOrder                 = 16;
370         psEncC->la_shape                        = 5 * psEncC->fs_kHz;
371         psEncC->nStatesDelayedDecision          = MAX_DEL_DEC_STATES;
372         psEncC->useInterpolatedNLSFs            = 1;
373         psEncC->LTPQuantLowComplexity           = 0;
374         psEncC->NLSF_MSVQ_Survivors             = 32;
375         psEncC->warping_Q16                     = psEncC->fs_kHz * SILK_FIX_CONST( WARPING_MULTIPLIER, 16 );
376     }
377
378     /* Do not allow higher pitch estimation LPC order than predict LPC order */
379     psEncC->pitchEstimationLPCOrder = silk_min_int( psEncC->pitchEstimationLPCOrder, psEncC->predictLPCOrder );
380     psEncC->shapeWinLength          = SUB_FRAME_LENGTH_MS * psEncC->fs_kHz + 2 * psEncC->la_shape;
381     psEncC->Complexity              = Complexity;
382
383     silk_assert( psEncC->pitchEstimationLPCOrder <= MAX_FIND_PITCH_LPC_ORDER );
384     silk_assert( psEncC->shapingLPCOrder         <= MAX_SHAPE_LPC_ORDER      );
385     silk_assert( psEncC->nStatesDelayedDecision  <= MAX_DEL_DEC_STATES       );
386     silk_assert( psEncC->warping_Q16             <= 32767                    );
387     silk_assert( psEncC->la_shape                <= LA_SHAPE_MAX             );
388     silk_assert( psEncC->shapeWinLength          <= SHAPE_LPC_WIN_MAX        );
389     silk_assert( psEncC->NLSF_MSVQ_Survivors     <= NLSF_VQ_MAX_SURVIVORS    );
390
391     return ret;
392 }
393
394 static inline opus_int silk_setup_LBRR(
395     silk_encoder_state          *psEncC,            /* I/O                      */
396     const opus_int32            TargetRate_bps      /* I                        */
397 )
398 {
399     opus_int   ret = SILK_NO_ERROR;
400     opus_int32 LBRR_rate_thres_bps;
401
402     psEncC->LBRR_enabled = 0;
403     if( psEncC->useInBandFEC && psEncC->PacketLoss_perc > 0 ) {
404         if( psEncC->fs_kHz == 8 ) {
405             LBRR_rate_thres_bps = LBRR_NB_MIN_RATE_BPS;
406         } else if( psEncC->fs_kHz == 12 ) {
407             LBRR_rate_thres_bps = LBRR_MB_MIN_RATE_BPS;
408         } else {
409             LBRR_rate_thres_bps = LBRR_WB_MIN_RATE_BPS;
410         }
411         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 ) );
412
413         if( TargetRate_bps > LBRR_rate_thres_bps ) {
414             /* Set gain increase for coding LBRR excitation */
415             psEncC->LBRR_enabled = 1;
416             psEncC->LBRR_GainIncreases = silk_max_int( 7 - silk_SMULWB( psEncC->PacketLoss_perc, SILK_FIX_CONST( 0.4, 16 ) ), 2 );
417         }
418     }
419
420     return ret;
421 }