/src/opus/silk/float/encode_frame_FLP.c

Source
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of Internet Society, IETF or IETF Trust, nor the
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include "main_FLP.h"
#include "tuning_parameters.h"
#include "stack_alloc.h"

/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
static OPUS_INLINE void silk_LBRR_encode_FLP(
    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
    const silk_float                xfw[],                              /* I    Input signal                                */
    opus_int                        condCoding                          /* I    The type of conditional coding used so far for this frame */
);

void silk_encode_do_VAD_FLP(
    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
    opus_int                        activity                            /* I    Decision of Opus voice activity detector    */
)
{
    const opus_int activity_threshold = SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 );

    /****************************/
    /* Voice Activity Detection */
    /****************************/
    silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch );
    /* If Opus VAD is inactive and Silk VAD is active: lower Silk VAD to just under the threshold */
    if( activity == VAD_NO_ACTIVITY && psEnc->sCmn.speech_activity_Q8 >= activity_threshold ) {
        psEnc->sCmn.speech_activity_Q8 = activity_threshold - 1;
    }

    /**************************************************/
    /* Convert speech activity into VAD and DTX flags */
    /**************************************************/
    if( psEnc->sCmn.speech_activity_Q8 < activity_threshold ) {
        psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
        psEnc->sCmn.noSpeechCounter++;
        if( psEnc->sCmn.noSpeechCounter <= NB_SPEECH_FRAMES_BEFORE_DTX ) {
            psEnc->sCmn.inDTX = 0;
        } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
            psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
            psEnc->sCmn.inDTX           = 0;
        }
        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
    } else {
        psEnc->sCmn.noSpeechCounter    = 0;
        psEnc->sCmn.inDTX              = 0;
        psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
        psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
    }
}

/****************/
/* Encode frame */
/****************/
opus_int silk_encode_frame_FLP(
    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
    opus_int32                      *pnBytesOut,                        /* O    Number of payload bytes;                    */
    ec_enc                          *psRangeEnc,                        /* I/O  compressor data structure                   */
    opus_int                        condCoding,                         /* I    The type of conditional coding to use       */
    opus_int                        maxBits,                            /* I    If > 0: maximum number of output bits       */
    opus_int                        useCBR                              /* I    Flag to force constant-bitrate operation    */
)
{
    silk_encoder_control_FLP sEncCtrl;
    opus_int     i, iter, maxIter, found_upper, found_lower, ret = 0;
    silk_float   *x_frame, *res_pitch_frame;
    silk_float   res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
    ec_enc       sRangeEnc_copy, sRangeEnc_copy2;
    VARDECL(silk_nsq_state, sNSQ_copy);
    opus_int32   seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
    opus_int32   gainsID, gainsID_lower, gainsID_upper;
    opus_int16   gainMult_Q8;
    opus_int16   ec_prevLagIndex_copy;
    opus_int     ec_prevSignalType_copy;
    opus_int8    LastGainIndex_copy2;
    opus_int32   pGains_Q16[ MAX_NB_SUBFR ];
    opus_int     gain_lock[ MAX_NB_SUBFR ] = {0};
    opus_int16   best_gain_mult[ MAX_NB_SUBFR ];
    opus_int     best_sum[ MAX_NB_SUBFR ];
    opus_int     bits_margin;
    SAVE_STACK;

    /* Using ALLOC() instead of a regular stack allocation to minimize real stack use when using the pseudostack.
       This is useful on some embedded systems. */
    ALLOC(sNSQ_copy, 2, silk_nsq_state);

    /* For CBR, 5 bits below budget is close enough. For VBR, allow up to 25% below the cap if we initially busted the budget. */
    bits_margin = useCBR ? 5 : maxBits/4;
    /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
    LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;

    psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;

    /**************************************************************/
    /* Set up Input Pointers, and insert frame in input buffer    */
    /**************************************************************/
    /* pointers aligned with start of frame to encode */
    x_frame         = psEnc->x_buf + psEnc->sCmn.ltp_mem_length;    /* start of frame to encode */
    res_pitch_frame = res_pitch    + psEnc->sCmn.ltp_mem_length;    /* start of pitch LPC residual frame */

    /***************************************/
    /* Ensure smooth bandwidth transitions */
    /***************************************/
    silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );

    /*******************************************/
    /* Copy new frame to front of input buffer */
    /*******************************************/
    silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );

    /* Add tiny signal to avoid high CPU load from denormalized floating point numbers */
    for( i = 0; i < 8; i++ ) {
        x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f;
    }

    if( !psEnc->sCmn.prefillFlag ) {
        VARDECL( opus_uint8, ec_buf_copy );
        /*****************************************/
        /* Find pitch lags, initial LPC analysis */
        /*****************************************/
        silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );

        /************************/
        /* Noise shape analysis */
        /************************/
        silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );

        /***************************************************/
        /* Find linear prediction coefficients (LPC + LTP) */
        /***************************************************/
        silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame, condCoding );

        /****************************************/
        /* Process gains                        */
        /****************************************/
        silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding );

        /****************************************/
        /* Low Bitrate Redundant Encoding       */
        /****************************************/
        silk_LBRR_encode_FLP( psEnc, &sEncCtrl, x_frame, condCoding );

        /* Loop over quantizer and entroy coding to control bitrate */
        maxIter = 6;
        gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
        found_lower = 0;
        found_upper = 0;
        gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
        gainsID_lower = -1;
        gainsID_upper = -1;
        /* Copy part of the input state */
        silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
        silk_memcpy( &sNSQ_copy[0], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
        seed_copy = psEnc->sCmn.indices.Seed;
        ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
        ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
        ALLOC( ec_buf_copy, 1275, opus_uint8 );
        for( iter = 0; ; iter++ ) {
            if( gainsID == gainsID_lower ) {
                nBits = nBits_lower;
            } else if( gainsID == gainsID_upper ) {
                nBits = nBits_upper;
            } else {
                /* Restore part of the input state */
                if( iter > 0 ) {
                    silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy[0], sizeof( silk_nsq_state ) );
                    psEnc->sCmn.indices.Seed = seed_copy;
                    psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
                    psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
                }

                /*****************************************/
                /* Noise shaping quantization            */
                /*****************************************/
                silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, x_frame );

                if ( iter == maxIter && !found_lower ) {
                    silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
                }

                /****************************************/
                /* Encode Parameters                    */
                /****************************************/
                silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );

                /****************************************/
                /* Encode Excitation Signal             */
                /****************************************/
                silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
                      psEnc->sCmn.pulses, psEnc->sCmn.frame_length );

                nBits = ec_tell( psRangeEnc );

                /* If we still bust after the last iteration, do some damage control. */
                if ( iter == maxIter && !found_lower && nBits > maxBits ) {
                    silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );

                    /* Keep gains the same as the last frame. */
                    psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
                    for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
                        psEnc->sCmn.indices.GainsIndices[ i ] = 4;
                    }
                    if (condCoding != CODE_CONDITIONALLY) {
                       psEnc->sCmn.indices.GainsIndices[ 0 ] = sEncCtrl.lastGainIndexPrev;
                    }
                    psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
                    psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
                    /* Clear all pulses. */
                    for ( i = 0; i < psEnc->sCmn.frame_length; i++ ) {
                        psEnc->sCmn.pulses[ i ] = 0;
                    }

                    silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );

                    silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
                        psEnc->sCmn.pulses, psEnc->sCmn.frame_length );

                    nBits = ec_tell( psRangeEnc );
                }

                if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
                    break;
                }
            }

            if( iter == maxIter ) {
                if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) {
                    /* Restore output state from earlier iteration that did meet the bitrate budget */
                    silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
                    celt_assert( sRangeEnc_copy2.offs <= 1275 );
                    silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
                    silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy[1], sizeof( silk_nsq_state ) );
                    psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
                }
                break;
            }

            if( nBits > maxBits ) {
                if( found_lower == 0 && iter >= 2 ) {
                    /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
                    sEncCtrl.Lambda = silk_max_float(sEncCtrl.Lambda*1.5f, 1.5f);
                    /* Reducing dithering can help us hit the target. */
                    psEnc->sCmn.indices.quantOffsetType = 0;
                    found_upper = 0;
                    gainsID_upper = -1;
                } else {
                    found_upper = 1;
                    nBits_upper = nBits;
                    gainMult_upper = gainMult_Q8;
                    gainsID_upper = gainsID;
                }
            } else if( nBits < maxBits - bits_margin ) {
                found_lower = 1;
                nBits_lower = nBits;
                gainMult_lower = gainMult_Q8;
                if( gainsID != gainsID_lower ) {
                    gainsID_lower = gainsID;
                    /* Copy part of the output state */
                    silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
                    celt_assert( psRangeEnc->offs <= 1275 );
                    silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
                    silk_memcpy( &sNSQ_copy[1], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
                    LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
                }
            } else {
                /* Close enough */
                break;
            }

            if ( !found_lower && nBits > maxBits ) {
                int j;
                for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
                    int sum=0;
                    for ( j = i*psEnc->sCmn.subfr_length; j < (i+1)*psEnc->sCmn.subfr_length; j++ ) {
                        sum += abs( psEnc->sCmn.pulses[j] );
                    }
                    if ( iter == 0 || (sum < best_sum[i] && !gain_lock[i]) ) {
                        best_sum[i] = sum;
                        best_gain_mult[i] = gainMult_Q8;
                    } else {
                        gain_lock[i] = 1;
                    }
                }
            }
            if( ( found_lower & found_upper ) == 0 ) {
                /* Adjust gain according to high-rate rate/distortion curve */
                if( nBits > maxBits ) {
                    gainMult_Q8 = silk_min_32( 1024, gainMult_Q8*3/2 );
                } else {
                    gainMult_Q8 = silk_max_32( 64, gainMult_Q8*4/5 );
                }
            } else {
                /* Adjust gain by interpolating */
                gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower );
                /* New gain multiplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
                if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
                    gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
                } else
                if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
                    gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
                }
            }

            for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
                opus_int16 tmp;
                if ( gain_lock[i] ) {
                    tmp = best_gain_mult[i];
                } else {
                    tmp = gainMult_Q8;
                }
                pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], tmp ), 8 );
            }

            /* Quantize gains */
            psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
            silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
                  &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );

            /* Unique identifier of gains vector */
            gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );

            /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
            for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
                sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f;
            }
        }
    }

    /* Update input buffer */
    silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
        ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) );

    /* Exit without entropy coding */
    if( psEnc->sCmn.prefillFlag ) {
        /* No payload */
        *pnBytesOut = 0;
        RESTORE_STACK;
        return ret;
    }

    /* Parameters needed for next frame */
    psEnc->sCmn.prevLag        = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
    psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;

    /****************************************/
    /* Finalize payload                     */
    /****************************************/
    psEnc->sCmn.first_frame_after_reset = 0;
    /* Payload size */
    *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );

    RESTORE_STACK;
    return ret;
}

/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate  */
static OPUS_INLINE void silk_LBRR_encode_FLP(
    silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
    silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
    const silk_float                xfw[],                              /* I    Input signal                                */
    opus_int                        condCoding                          /* I    The type of conditional coding used so far for this frame */
)
{
    opus_int     k;
    opus_int32   Gains_Q16[ MAX_NB_SUBFR ];
    silk_float   TempGains[ MAX_NB_SUBFR ];
    SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
    VARDECL(silk_nsq_state, sNSQ_LBRR);
    SAVE_STACK;

    /*******************************************/
    /* Control use of inband LBRR              */
    /*******************************************/
    if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
        /* Using ALLOC() instead of a regular stack allocation to minimize real stack use when using the pseudostack.
           This is useful on some embedded systems. */
        ALLOC(sNSQ_LBRR, 1, silk_nsq_state);

        psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;

        /* Copy noise shaping quantizer state and quantization indices from regular encoding */
        silk_memcpy( &sNSQ_LBRR[0], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
        silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );

        /* Save original gains */
        silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );

        if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
            /* First frame in packet or previous frame not LBRR coded */
            psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;

            /* Increase Gains to get target LBRR rate */
            psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases;
            psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
        }

        /* Decode to get gains in sync with decoder */
        silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
            &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );

        /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
        for( k = 0; k <  psEnc->sCmn.nb_subfr; k++ ) {
            psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f );
        }

        /*****************************************/
        /* Noise shaping quantization            */
        /*****************************************/
        silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR[0],
            psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw );

        /* Restore original gains */
        silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
    }
    RESTORE_STACK;
}

Coverage Report

Created: 2026-04-12 08:03

Line	Count	Source
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
20		CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21		SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23		CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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		#ifdef HAVE_CONFIG_H
29		#include "config.h"
30		#endif
31
32		#include <stdlib.h>
33		#include "main_FLP.h"
34		#include "tuning_parameters.h"
35		#include "stack_alloc.h"
36
37		/* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */
38		static OPUS_INLINE void silk_LBRR_encode_FLP(
39		silk_encoder_state_FLP psEnc, / I/O Encoder state FLP */
40		silk_encoder_control_FLP psEncCtrl, / I/O Encoder control FLP */
41		const silk_float xfw[], /* I Input signal */
42		opus_int condCoding /* I The type of conditional coding used so far for this frame */
43		);
44
45		void silk_encode_do_VAD_FLP(
46		silk_encoder_state_FLP psEnc, / I/O Encoder state FLP */
47		opus_int activity /* I Decision of Opus voice activity detector */
48		)
49	234k	{
50	234k	const opus_int activity_threshold = SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 );
51
52		/****************************/
53		/* Voice Activity Detection */
54		/****************************/
55	234k	silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch );
56		/* If Opus VAD is inactive and Silk VAD is active: lower Silk VAD to just under the threshold */
57	234k	if( activity == VAD_NO_ACTIVITY && psEnc->sCmn.speech_activity_Q8 >= activity_threshold ) {
58	911	psEnc->sCmn.speech_activity_Q8 = activity_threshold - 1;
59	911	}
60
61		/**************************************************/
62		/* Convert speech activity into VAD and DTX flags */
63		/**************************************************/
64	234k	if( psEnc->sCmn.speech_activity_Q8 < activity_threshold ) {
65	45.4k	psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY;
66	45.4k	psEnc->sCmn.noSpeechCounter++;
67	45.4k	if( psEnc->sCmn.noSpeechCounter <= NB_SPEECH_FRAMES_BEFORE_DTX ) {
68	45.4k	psEnc->sCmn.inDTX = 0;
69	45.4k	} else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) {
70	0	psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX;
71	0	psEnc->sCmn.inDTX = 0;
72	0	}
73	45.4k	psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0;
74	189k	} else {
75	189k	psEnc->sCmn.noSpeechCounter = 0;
76	189k	psEnc->sCmn.inDTX = 0;
77	189k	psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
78	189k	psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
79	189k	}
80	234k	}
81
82		/****************/
83		/* Encode frame */
84		/****************/
85		opus_int silk_encode_frame_FLP(
86		silk_encoder_state_FLP psEnc, / I/O Encoder state FLP */
87		opus_int32 pnBytesOut, / O Number of payload bytes; */
88		ec_enc psRangeEnc, / I/O compressor data structure */
89		opus_int condCoding, /* I The type of conditional coding to use */
90		opus_int maxBits, /* I If > 0: maximum number of output bits */
91		opus_int useCBR /* I Flag to force constant-bitrate operation */
92		)
93	234k	{
94	234k	silk_encoder_control_FLP sEncCtrl;
95	234k	opus_int i, iter, maxIter, found_upper, found_lower, ret = 0;
96	234k	silk_float x_frame, res_pitch_frame;
97	234k	silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ];
98	234k	ec_enc sRangeEnc_copy, sRangeEnc_copy2;
99	234k	VARDECL(silk_nsq_state, sNSQ_copy);
100	234k	opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper;
101	234k	opus_int32 gainsID, gainsID_lower, gainsID_upper;
102	234k	opus_int16 gainMult_Q8;
103	234k	opus_int16 ec_prevLagIndex_copy;
104	234k	opus_int ec_prevSignalType_copy;
105	234k	opus_int8 LastGainIndex_copy2;
106	234k	opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
107	234k	opus_int gain_lock[ MAX_NB_SUBFR ] = {0};
108	234k	opus_int16 best_gain_mult[ MAX_NB_SUBFR ];
109	234k	opus_int best_sum[ MAX_NB_SUBFR ];
110	234k	opus_int bits_margin;
111	234k	SAVE_STACK;
112
113		/* Using ALLOC() instead of a regular stack allocation to minimize real stack use when using the pseudostack.
114		This is useful on some embedded systems. */
115	234k	ALLOC(sNSQ_copy, 2, silk_nsq_state);
116
117		/* For CBR, 5 bits below budget is close enough. For VBR, allow up to 25% below the cap if we initially busted the budget. */
118	234k	bits_margin = useCBR ? 5 : maxBits/4;
119		/* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */
120	234k	LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0;
121
122	234k	psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3;
123
124		/**************************************************************/
125		/* Set up Input Pointers, and insert frame in input buffer */
126		/**************************************************************/
127		/* pointers aligned with start of frame to encode */
128	234k	x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; /* start of frame to encode */
129	234k	res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; /* start of pitch LPC residual frame */
130
131		/***************************************/
132		/* Ensure smooth bandwidth transitions */
133		/***************************************/
134	234k	silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
135
136		/*******************************************/
137		/* Copy new frame to front of input buffer */
138		/*******************************************/
139	234k	silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length );
140
141		/* Add tiny signal to avoid high CPU load from denormalized floating point numbers */
142	2.11M	for( i = 0; i < 8; i++ ) {
143	1.87M	x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f;
144	1.87M	}
145
146	234k	if( !psEnc->sCmn.prefillFlag ) {
147	234k	VARDECL( opus_uint8, ec_buf_copy );
148		/*****************************************/
149		/* Find pitch lags, initial LPC analysis */
150		/*****************************************/
151	234k	silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch );
152
153		/************************/
154		/* Noise shape analysis */
155		/************************/
156	234k	silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame );
157
158		/***************************************************/
159		/* Find linear prediction coefficients (LPC + LTP) */
160		/***************************************************/
161	234k	silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame, condCoding );
162
163		/****************************************/
164		/* Process gains */
165		/****************************************/
166	234k	silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding );
167
168		/****************************************/
169		/* Low Bitrate Redundant Encoding */
170		/****************************************/
171	234k	silk_LBRR_encode_FLP( psEnc, &sEncCtrl, x_frame, condCoding );
172
173		/* Loop over quantizer and entroy coding to control bitrate */
174	234k	maxIter = 6;
175	234k	gainMult_Q8 = SILK_FIX_CONST( 1, 8 );
176	234k	found_lower = 0;
177	234k	found_upper = 0;
178	234k	gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
179	234k	gainsID_lower = -1;
180	234k	gainsID_upper = -1;
181		/* Copy part of the input state */
182	234k	silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) );
183	234k	silk_memcpy( &sNSQ_copy[0], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
184	234k	seed_copy = psEnc->sCmn.indices.Seed;
185	234k	ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex;
186	234k	ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType;
187	234k	ALLOC( ec_buf_copy, 1275, opus_uint8 );
188	711k	for( iter = 0; ; iter++ ) {
189	711k	if( gainsID == gainsID_lower ) {
190	84.0k	nBits = nBits_lower;
191	627k	} else if( gainsID == gainsID_upper ) {
192	13.6k	nBits = nBits_upper;
193	613k	} else {
194		/* Restore part of the input state */
195	613k	if( iter > 0 ) {
196	378k	silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) );
197	378k	silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy[0], sizeof( silk_nsq_state ) );
198	378k	psEnc->sCmn.indices.Seed = seed_copy;
199	378k	psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
200	378k	psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
201	378k	}
202
203		/*****************************************/
204		/* Noise shaping quantization */
205		/*****************************************/
206	613k	silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, x_frame );
207
208	613k	if ( iter == maxIter && !found_lower ) {
209	15.5k	silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
210	15.5k	}
211
212		/****************************************/
213		/* Encode Parameters */
214		/****************************************/
215	613k	silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
216
217		/****************************************/
218		/* Encode Excitation Signal */
219		/****************************************/
220	613k	silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
221	613k	psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
222
223	613k	nBits = ec_tell( psRangeEnc );
224
225		/* If we still bust after the last iteration, do some damage control. */
226	613k	if ( iter == maxIter && !found_lower && nBits > maxBits ) {
227	14.5k	silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
228
229		/* Keep gains the same as the last frame. */
230	14.5k	psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
231	71.6k	for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
232	57.1k	psEnc->sCmn.indices.GainsIndices[ i ] = 4;
233	57.1k	}
234	14.5k	if (condCoding != CODE_CONDITIONALLY) {
235	10.2k	psEnc->sCmn.indices.GainsIndices[ 0 ] = sEncCtrl.lastGainIndexPrev;
236	10.2k	}
237	14.5k	psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy;
238	14.5k	psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy;
239		/* Clear all pulses. */
240	2.87M	for ( i = 0; i < psEnc->sCmn.frame_length; i++ ) {
241	2.86M	psEnc->sCmn.pulses[ i ] = 0;
242	2.86M	}
243
244	14.5k	silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding );
245
246	14.5k	silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType,
247	14.5k	psEnc->sCmn.pulses, psEnc->sCmn.frame_length );
248
249	14.5k	nBits = ec_tell( psRangeEnc );
250	14.5k	}
251
252	613k	if( useCBR == 0 && iter == 0 && nBits <= maxBits ) {
253	149k	break;
254	149k	}
255	613k	}
256
257	561k	if( iter == maxIter ) {
258	74.5k	if( found_lower && ( gainsID == gainsID_lower \|\| nBits > maxBits ) ) {
259		/* Restore output state from earlier iteration that did meet the bitrate budget */
260	24.5k	silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) );
261	24.5k	celt_assert( sRangeEnc_copy2.offs <= 1275 );
262	24.5k	silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs );
263	24.5k	silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy[1], sizeof( silk_nsq_state ) );
264	24.5k	psEnc->sShape.LastGainIndex = LastGainIndex_copy2;
265	24.5k	}
266	74.5k	break;
267	74.5k	}
268
269	486k	if( nBits > maxBits ) {
270	131k	if( found_lower == 0 && iter >= 2 ) {
271		/* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */
272	68.2k	sEncCtrl.Lambda = silk_max_float(sEncCtrl.Lambda*1.5f, 1.5f);
273		/* Reducing dithering can help us hit the target. */
274	68.2k	psEnc->sCmn.indices.quantOffsetType = 0;
275	68.2k	found_upper = 0;
276	68.2k	gainsID_upper = -1;
277	68.2k	} else {
278	63.3k	found_upper = 1;
279	63.3k	nBits_upper = nBits;
280	63.3k	gainMult_upper = gainMult_Q8;
281	63.3k	gainsID_upper = gainsID;
282	63.3k	}
283	355k	} else if( nBits < maxBits - bits_margin ) {
284	344k	found_lower = 1;
285	344k	nBits_lower = nBits;
286	344k	gainMult_lower = gainMult_Q8;
287	344k	if( gainsID != gainsID_lower ) {
288	278k	gainsID_lower = gainsID;
289		/* Copy part of the output state */
290	278k	silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) );
291	278k	celt_assert( psRangeEnc->offs <= 1275 );
292	278k	silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs );
293	278k	silk_memcpy( &sNSQ_copy[1], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
294	278k	LastGainIndex_copy2 = psEnc->sShape.LastGainIndex;
295	278k	}
296	344k	} else {
297		/* Close enough */
298	10.4k	break;
299	10.4k	}
300
301	476k	if ( !found_lower && nBits > maxBits ) {
302	112k	int j;
303	550k	for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
304	437k	int sum=0;
305	22.3M	for ( j = ipsEnc->sCmn.subfr_length; j < (i+1)psEnc->sCmn.subfr_length; j++ ) {
306	21.9M	sum += abs( psEnc->sCmn.pulses[j] );
307	21.9M	}
308	437k	if ( iter == 0 \|\| (sum < best_sum[i] && !gain_lock[i]) ) {
309	186k	best_sum[i] = sum;
310	186k	best_gain_mult[i] = gainMult_Q8;
311	251k	} else {
312	251k	gain_lock[i] = 1;
313	251k	}
314	437k	}
315	112k	}
316	476k	if( ( found_lower & found_upper ) == 0 ) {
317		/* Adjust gain according to high-rate rate/distortion curve */
318	446k	if( nBits > maxBits ) {
319	112k	gainMult_Q8 = silk_min_32( 1024, gainMult_Q8*3/2 );
320	333k	} else {
321	333k	gainMult_Q8 = silk_max_32( 64, gainMult_Q8*4/5 );
322	333k	}
323	446k	} else {
324		/* Adjust gain by interpolating */
325	30.0k	gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower );
326		/* New gain multiplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */
327	30.0k	if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) {
328	4.86k	gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 );
329	4.86k	} else
330	25.1k	if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) {
331	7.66k	gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 );
332	7.66k	}
333	30.0k	}
334
335	2.05M	for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
336	1.57M	opus_int16 tmp;
337	1.57M	if ( gain_lock[i] ) {
338	256k	tmp = best_gain_mult[i];
339	1.32M	} else {
340	1.32M	tmp = gainMult_Q8;
341	1.32M	}
342	1.57M	pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], tmp ), 8 );
343	1.57M	}
344
345		/* Quantize gains */
346	476k	psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev;
347	476k	silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
348	476k	&psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
349
350		/* Unique identifier of gains vector */
351	476k	gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr );
352
353		/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
354	2.05M	for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
355	1.57M	sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f;
356	1.57M	}
357	476k	}
358	234k	}
359
360		/* Update input buffer */
361	234k	silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ],
362	234k	( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) );
363
364		/* Exit without entropy coding */
365	234k	if( psEnc->sCmn.prefillFlag ) {
366		/* No payload */
367	0	*pnBytesOut = 0;
368	0	RESTORE_STACK;
369	0	return ret;
370	0	}
371
372		/* Parameters needed for next frame */
373	234k	psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ];
374	234k	psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType;
375
376		/****************************************/
377		/* Finalize payload */
378		/****************************************/
379	234k	psEnc->sCmn.first_frame_after_reset = 0;
380		/* Payload size */
381	234k	*pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 );
382
383	234k	RESTORE_STACK;
384	234k	return ret;
385	234k	}
386
387		/* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */
388		static OPUS_INLINE void silk_LBRR_encode_FLP(
389		silk_encoder_state_FLP psEnc, / I/O Encoder state FLP */
390		silk_encoder_control_FLP psEncCtrl, / I/O Encoder control FLP */
391		const silk_float xfw[], /* I Input signal */
392		opus_int condCoding /* I The type of conditional coding used so far for this frame */
393		)
394	234k	{
395	234k	opus_int k;
396	234k	opus_int32 Gains_Q16[ MAX_NB_SUBFR ];
397	234k	silk_float TempGains[ MAX_NB_SUBFR ];
398	234k	SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ];
399	234k	VARDECL(silk_nsq_state, sNSQ_LBRR);
400	234k	SAVE_STACK;
401
402		/*******************************************/
403		/* Control use of inband LBRR */
404		/*******************************************/
405	234k	if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) {
406		/* Using ALLOC() instead of a regular stack allocation to minimize real stack use when using the pseudostack.
407		This is useful on some embedded systems. */
408	111k	ALLOC(sNSQ_LBRR, 1, silk_nsq_state);
409
410	111k	psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1;
411
412		/* Copy noise shaping quantizer state and quantization indices from regular encoding */
413	111k	silk_memcpy( &sNSQ_LBRR[0], &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) );
414	111k	silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) );
415
416		/* Save original gains */
417	111k	silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
418
419	111k	if( psEnc->sCmn.nFramesEncoded == 0 \|\| psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) {
420		/* First frame in packet or previous frame not LBRR coded */
421	83.7k	psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex;
422
423		/* Increase Gains to get target LBRR rate */
424	83.7k	psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases;
425	83.7k	psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 );
426	83.7k	}
427
428		/* Decode to get gains in sync with decoder */
429	111k	silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices,
430	111k	&psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
431
432		/* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
433	500k	for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
434	389k	psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f );
435	389k	}
436
437		/*****************************************/
438		/* Noise shaping quantization */
439		/*****************************************/
440	111k	silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR[0],
441	111k	psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw );
442
443		/* Restore original gains */
444	111k	silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) );
445	111k	}
446	234k	RESTORE_STACK;
447	234k	}