michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: #include "main_FIX.h"
michael@0: #include "stack_alloc.h"
michael@0: #include "tuning_parameters.h"
michael@0: 
michael@0: /* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate           */
michael@0: static OPUS_INLINE void silk_LBRR_encode_FIX(
michael@0:     silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
michael@0:     silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Pointer to Silk FIX encoder control struct                                  */
michael@0:     const opus_int32                xfw_Q3[],                               /* I    Input signal                                                                */
michael@0:     opus_int                        condCoding                              /* I    The type of conditional coding used so far for this frame                   */
michael@0: );
michael@0: 
michael@0: void silk_encode_do_VAD_FIX(
michael@0:     silk_encoder_state_FIX          *psEnc                                  /* I/O  Pointer to Silk FIX encoder state                                           */
michael@0: )
michael@0: {
michael@0:     /****************************/
michael@0:     /* Voice Activity Detection */
michael@0:     /****************************/
michael@0:     silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1 );
michael@0: 
michael@0:     /**************************************************/
michael@0:     /* Convert speech activity into VAD and DTX flags */
michael@0:     /**************************************************/
michael@0:     if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) {
michael@0:         psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
michael@0:         psEnc->sCmn.noSpeechCounter++;
michael@0:         if( psEnc->sCmn.noSpeechCounter < NB_SPEECH_FRAMES_BEFORE_DTX ) {
michael@0:             psEnc->sCmn.inDTX = 0;
michael@0:         } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
michael@0:             psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
michael@0:             psEnc->sCmn.inDTX           = 0;
michael@0:         }
michael@0:         psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
michael@0:     } else {
michael@0:         psEnc->sCmn.noSpeechCounter    = 0;
michael@0:         psEnc->sCmn.inDTX              = 0;
michael@0:         psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
michael@0:         psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
michael@0:     }
michael@0: }
michael@0: 
michael@0: /****************/
michael@0: /* Encode frame */
michael@0: /****************/
michael@0: opus_int silk_encode_frame_FIX(
michael@0:     silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
michael@0:     opus_int32                      *pnBytesOut,                            /* O    Pointer to number of payload bytes;                                         */
michael@0:     ec_enc                          *psRangeEnc,                            /* I/O  compressor data structure                                                   */
michael@0:     opus_int                        condCoding,                             /* I    The type of conditional coding to use                                       */
michael@0:     opus_int                        maxBits,                                /* I    If > 0: maximum number of output bits                                       */
michael@0:     opus_int                        useCBR                                  /* I    Flag to force constant-bitrate operation                                    */
michael@0: )
michael@0: {
michael@0:     silk_encoder_control_FIX sEncCtrl;
michael@0:     opus_int     i, iter, maxIter, found_upper, found_lower, ret = 0;
michael@0:     opus_int16   *x_frame;
michael@0:     ec_enc       sRangeEnc_copy, sRangeEnc_copy2;
michael@0:     silk_nsq_state sNSQ_copy, sNSQ_copy2;
michael@0:     opus_int32   seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
michael@0:     opus_int32   gainsID, gainsID_lower, gainsID_upper;
michael@0:     opus_int16   gainMult_Q8;
michael@0:     opus_int16   ec_prevLagIndex_copy;
michael@0:     opus_int     ec_prevSignalType_copy;
michael@0:     opus_int8    LastGainIndex_copy2;
michael@0:     SAVE_STACK;
michael@0: 
michael@0:     /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
michael@0:     LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
michael@0: 
michael@0:     psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
michael@0: 
michael@0:     /**************************************************************/
michael@0:     /* Set up Input Pointers, and insert frame in input buffer   */
michael@0:     /*************************************************************/
michael@0:     /* start of frame to encode */
michael@0:     x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length;
michael@0: 
michael@0:     /***************************************/
michael@0:     /* Ensure smooth bandwidth transitions */
michael@0:     /***************************************/
michael@0:     silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
michael@0: 
michael@0:     /*******************************************/
michael@0:     /* Copy new frame to front of input buffer */
michael@0:     /*******************************************/
michael@0:     silk_memcpy( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length * sizeof( opus_int16 ) );
michael@0: 
michael@0:     if( !psEnc->sCmn.prefillFlag ) {
michael@0:         VARDECL( opus_int32, xfw_Q3 );
michael@0:         VARDECL( opus_int16, res_pitch );
michael@0:         VARDECL( opus_uint8, ec_buf_copy );
michael@0:         opus_int16 *res_pitch_frame;
michael@0: 
michael@0:         ALLOC( res_pitch,
michael@0:                psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length
michael@0:                    + psEnc->sCmn.ltp_mem_length, opus_int16 );
michael@0:         /* start of pitch LPC residual frame */
michael@0:         res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length;
michael@0: 
michael@0:         /*****************************************/
michael@0:         /* Find pitch lags, initial LPC analysis */
michael@0:         /*****************************************/
michael@0:         silk_find_pitch_lags_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
michael@0: 
michael@0:         /************************/
michael@0:         /* Noise shape analysis */
michael@0:         /************************/
michael@0:         silk_noise_shape_analysis_FIX( psEnc, &sEncCtrl, res_pitch_frame, x_frame, psEnc->sCmn.arch );
michael@0: 
michael@0:         /***************************************************/
michael@0:         /* Find linear prediction coefficients (LPC + LTP) */
michael@0:         /***************************************************/
michael@0:         silk_find_pred_coefs_FIX( psEnc, &sEncCtrl, res_pitch, x_frame, condCoding );
michael@0: 
michael@0:         /****************************************/
michael@0:         /* Process gains                        */
michael@0:         /****************************************/
michael@0:         silk_process_gains_FIX( psEnc, &sEncCtrl, condCoding );
michael@0: 
michael@0:         /*****************************************/
michael@0:         /* Prefiltering for noise shaper         */
michael@0:         /*****************************************/
michael@0:         ALLOC( xfw_Q3, psEnc->sCmn.frame_length, opus_int32 );
michael@0:         silk_prefilter_FIX( psEnc, &sEncCtrl, xfw_Q3, x_frame );
michael@0: 
michael@0:         /****************************************/
michael@0:         /* Low Bitrate Redundant Encoding       */
michael@0:         /****************************************/
michael@0:         silk_LBRR_encode_FIX( psEnc, &sEncCtrl, xfw_Q3, condCoding );
michael@0: 
michael@0:         /* Loop over quantizer and entropy coding to control bitrate */
michael@0:         maxIter = 6;
michael@0:         gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
michael@0:         found_lower = 0;
michael@0:         found_upper = 0;
michael@0:         gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
michael@0:         gainsID_lower = -1;
michael@0:         gainsID_upper = -1;
michael@0:         /* Copy part of the input state */
michael@0:         silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
michael@0:         silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
michael@0:         seed_copy = psEnc->sCmn.indices.Seed;
michael@0:         ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
michael@0:         ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
michael@0:         ALLOC( ec_buf_copy, 1275, opus_uint8 );
michael@0:         for( iter = 0; ; iter++ ) {
michael@0:             if( gainsID == gainsID_lower ) {
michael@0:                 nBits = nBits_lower;
michael@0:             } else if( gainsID == gainsID_upper ) {
michael@0:                 nBits = nBits_upper;
michael@0:             } else {
michael@0:                 /* Restore part of the input state */
michael@0:                 if( iter > 0 ) {
michael@0:                     silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
michael@0:                     silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) );
michael@0:                     psEnc->sCmn.indices.Seed = seed_copy;
michael@0:                     psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
michael@0:                     psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
michael@0:                 }
michael@0: 
michael@0:                 /*****************************************/
michael@0:                 /* Noise shaping quantization            */
michael@0:                 /*****************************************/
michael@0:                 if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
michael@0:                     silk_NSQ_del_dec( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses,
michael@0:                            sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
michael@0:                            sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
michael@0:                 } else {
michael@0:                     silk_NSQ( &psEnc->sCmn, &psEnc->sCmn.sNSQ, &psEnc->sCmn.indices, xfw_Q3, psEnc->sCmn.pulses,
michael@0:                             sEncCtrl.PredCoef_Q12[ 0 ], sEncCtrl.LTPCoef_Q14, sEncCtrl.AR2_Q13, sEncCtrl.HarmShapeGain_Q14,
michael@0:                             sEncCtrl.Tilt_Q14, sEncCtrl.LF_shp_Q14, sEncCtrl.Gains_Q16, sEncCtrl.pitchL, sEncCtrl.Lambda_Q10, sEncCtrl.LTP_scale_Q14 );
michael@0:                 }
michael@0: 
michael@0:                 /****************************************/
michael@0:                 /* Encode Parameters                    */
michael@0:                 /****************************************/
michael@0:                 silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
michael@0: 
michael@0:                 /****************************************/
michael@0:                 /* Encode Excitation Signal             */
michael@0:                 /****************************************/
michael@0:                 silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
michael@0:                     psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
michael@0: 
michael@0:                 nBits = ec_tell( psRangeEnc );
michael@0: 
michael@0:                 if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
michael@0:                     break;
michael@0:                 }
michael@0:             }
michael@0: 
michael@0:             if( iter == maxIter ) {
michael@0:                 if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
michael@0:                     /* Restore output state from earlier iteration that did meet the bitrate budget */
michael@0:                     silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
michael@0:                     silk_assert( sRangeEnc_copy2.offs <= 1275 );
michael@0:                     silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
michael@0:                     silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) );
michael@0:                     psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
michael@0:                 }
michael@0:                 break;
michael@0:             }
michael@0: 
michael@0:             if( nBits > maxBits ) {
michael@0:                 if( found_lower == 0 && iter >= 2 ) {
michael@0:                     /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
michael@0:                     sEncCtrl.Lambda_Q10 = silk_ADD_RSHIFT32( sEncCtrl.Lambda_Q10, sEncCtrl.Lambda_Q10, 1 );
michael@0:                     found_upper = 0;
michael@0:                     gainsID_upper = -1;
michael@0:                 } else {
michael@0:                     found_upper = 1;
michael@0:                     nBits_upper = nBits;
michael@0:                     gainMult_upper = gainMult_Q8;
michael@0:                     gainsID_upper = gainsID;
michael@0:                 }
michael@0:             } else if( nBits < maxBits - 5 ) {
michael@0:                 found_lower = 1;
michael@0:                 nBits_lower = nBits;
michael@0:                 gainMult_lower = gainMult_Q8;
michael@0:                 if( gainsID != gainsID_lower ) {
michael@0:                     gainsID_lower = gainsID;
michael@0:                     /* Copy part of the output state */
michael@0:                     silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
michael@0:                     silk_assert( psRangeEnc->offs <= 1275 );
michael@0:                     silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
michael@0:                     silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
michael@0:                     LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
michael@0:                 }
michael@0:             } else {
michael@0:                 /* Within 5 bits of budget: close enough */
michael@0:                 break;
michael@0:             }
michael@0: 
michael@0:             if( ( found_lower & found_upper ) == 0 ) {
michael@0:                 /* Adjust gain according to high-rate rate/distortion curve */
michael@0:                 opus_int32 gain_factor_Q16;
michael@0:                 gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) );
michael@0:                 gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) );
michael@0:                 if( nBits > maxBits ) {
michael@0:                     gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) );
michael@0:                 }
michael@0:                 gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 );
michael@0:             } else {
michael@0:                 /* Adjust gain by interpolating */
michael@0:                 gainMult_Q8 = gainMult_lower + silk_DIV32_16( silk_MUL( gainMult_upper - gainMult_lower, maxBits - nBits_lower ), nBits_upper - nBits_lower );
michael@0:                 /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
michael@0:                 if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
michael@0:                     gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
michael@0:                 } else
michael@0:                 if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
michael@0:                     gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
michael@0:                 }
michael@0:             }
michael@0: 
michael@0:             for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
michael@0:                 sEncCtrl.Gains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 8 );
michael@0:             }
michael@0:  
michael@0:             /* Quantize gains */
michael@0:             psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
michael@0:             silk_gains_quant( psEnc->sCmn.indices.GainsIndices, sEncCtrl.Gains_Q16,
michael@0:                   &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
michael@0: 
michael@0:             /* Unique identifier of gains vector */
michael@0:             gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /* Update input buffer */
michael@0:     silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
michael@0:         ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( opus_int16 ) );
michael@0: 
michael@0:     /* Exit without entropy coding */
michael@0:     if( psEnc->sCmn.prefillFlag ) {
michael@0:         /* No payload */
michael@0:         *pnBytesOut = 0;
michael@0:         RESTORE_STACK;
michael@0:         return ret;
michael@0:     }
michael@0: 
michael@0:     /* Parameters needed for next frame */
michael@0:     psEnc->sCmn.prevLag        = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
michael@0:     psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
michael@0: 
michael@0:     /****************************************/
michael@0:     /* Finalize payload                     */
michael@0:     /****************************************/
michael@0:     psEnc->sCmn.first_frame_after_reset = 0;
michael@0:     /* Payload size */
michael@0:     *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
michael@0: 
michael@0:     RESTORE_STACK;
michael@0:     return ret;
michael@0: }
michael@0: 
michael@0: /* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate  */
michael@0: static OPUS_INLINE void silk_LBRR_encode_FIX(
michael@0:     silk_encoder_state_FIX          *psEnc,                                 /* I/O  Pointer to Silk FIX encoder state                                           */
michael@0:     silk_encoder_control_FIX        *psEncCtrl,                             /* I/O  Pointer to Silk FIX encoder control struct                                  */
michael@0:     const opus_int32                xfw_Q3[],                               /* I    Input signal                                                                */
michael@0:     opus_int                        condCoding                              /* I    The type of conditional coding used so far for this frame                   */
michael@0: )
michael@0: {
michael@0:     opus_int32   TempGains_Q16[ MAX_NB_SUBFR ];
michael@0:     SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
michael@0:     silk_nsq_state sNSQ_LBRR;
michael@0: 
michael@0:     /*******************************************/
michael@0:     /* Control use of inband LBRR              */
michael@0:     /*******************************************/
michael@0:     if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
michael@0:         psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
michael@0: 
michael@0:         /* Copy noise shaping quantizer state and quantization indices from regular encoding */
michael@0:         silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
michael@0:         silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
michael@0: 
michael@0:         /* Save original gains */
michael@0:         silk_memcpy( TempGains_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
michael@0: 
michael@0:         if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
michael@0:             /* First frame in packet or previous frame not LBRR coded */
michael@0:             psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
michael@0: 
michael@0:             /* Increase Gains to get target LBRR rate */
michael@0:             psIndices_LBRR->GainsIndices[ 0 ] = psIndices_LBRR->GainsIndices[ 0 ] + psEnc->sCmn.LBRR_GainIncreases;
michael@0:             psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
michael@0:         }
michael@0: 
michael@0:         /* Decode to get gains in sync with decoder         */
michael@0:         /* Overwrite unquantized gains with quantized gains */
michael@0:         silk_gains_dequant( psEncCtrl->Gains_Q16, psIndices_LBRR->GainsIndices,
michael@0:             &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
michael@0: 
michael@0:         /*****************************************/
michael@0:         /* Noise shaping quantization            */
michael@0:         /*****************************************/
michael@0:         if( psEnc->sCmn.nStatesDelayedDecision > 1 || psEnc->sCmn.warping_Q16 > 0 ) {
michael@0:             silk_NSQ_del_dec( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3,
michael@0:                 psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
michael@0:                 psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
michael@0:                 psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
michael@0:         } else {
michael@0:             silk_NSQ( &psEnc->sCmn, &sNSQ_LBRR, psIndices_LBRR, xfw_Q3,
michael@0:                 psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], psEncCtrl->PredCoef_Q12[ 0 ], psEncCtrl->LTPCoef_Q14,
michael@0:                 psEncCtrl->AR2_Q13, psEncCtrl->HarmShapeGain_Q14, psEncCtrl->Tilt_Q14, psEncCtrl->LF_shp_Q14,
michael@0:                 psEncCtrl->Gains_Q16, psEncCtrl->pitchL, psEncCtrl->Lambda_Q10, psEncCtrl->LTP_scale_Q14 );
michael@0:         }
michael@0: 
michael@0:         /* Restore original gains */
michael@0:         silk_memcpy( psEncCtrl->Gains_Q16, TempGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
michael@0:     }
michael@0: }