Chris@69: /*********************************************************************** Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved. Chris@69: Redistribution and use in source and binary forms, with or without Chris@69: modification, are permitted provided that the following conditions Chris@69: are met: Chris@69: - Redistributions of source code must retain the above copyright notice, Chris@69: this list of conditions and the following disclaimer. Chris@69: - Redistributions in binary form must reproduce the above copyright Chris@69: notice, this list of conditions and the following disclaimer in the Chris@69: documentation and/or other materials provided with the distribution. Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the Chris@69: names of specific contributors, may be used to endorse or promote Chris@69: products derived from this software without specific prior written Chris@69: permission. Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE Chris@69: POSSIBILITY OF SUCH DAMAGE. Chris@69: ***********************************************************************/ Chris@69: Chris@69: #ifdef HAVE_CONFIG_H Chris@69: #include "config.h" Chris@69: #endif Chris@69: Chris@69: #include Chris@69: #include "main_FLP.h" Chris@69: #include "tuning_parameters.h" Chris@69: Chris@69: /* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */ Chris@69: static OPUS_INLINE void silk_LBRR_encode_FLP( Chris@69: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ Chris@69: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ Chris@69: const silk_float xfw[], /* I Input signal */ Chris@69: opus_int condCoding /* I The type of conditional coding used so far for this frame */ Chris@69: ); Chris@69: Chris@69: void silk_encode_do_VAD_FLP( Chris@69: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ Chris@69: opus_int activity /* I Decision of Opus voice activity detector */ Chris@69: ) Chris@69: { Chris@69: const opus_int activity_threshold = SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ); Chris@69: Chris@69: /****************************/ Chris@69: /* Voice Activity Detection */ Chris@69: /****************************/ Chris@69: silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch ); Chris@69: /* If Opus VAD is inactive and Silk VAD is active: lower Silk VAD to just under the threshold */ Chris@69: if( activity == VAD_NO_ACTIVITY && psEnc->sCmn.speech_activity_Q8 >= activity_threshold ) { Chris@69: psEnc->sCmn.speech_activity_Q8 = activity_threshold - 1; Chris@69: } Chris@69: Chris@69: /**************************************************/ Chris@69: /* Convert speech activity into VAD and DTX flags */ Chris@69: /**************************************************/ Chris@69: if( psEnc->sCmn.speech_activity_Q8 < activity_threshold ) { Chris@69: psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY; Chris@69: psEnc->sCmn.noSpeechCounter++; Chris@69: if( psEnc->sCmn.noSpeechCounter <= NB_SPEECH_FRAMES_BEFORE_DTX ) { Chris@69: psEnc->sCmn.inDTX = 0; Chris@69: } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) { Chris@69: psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX; Chris@69: psEnc->sCmn.inDTX = 0; Chris@69: } Chris@69: psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0; Chris@69: } else { Chris@69: psEnc->sCmn.noSpeechCounter = 0; Chris@69: psEnc->sCmn.inDTX = 0; Chris@69: psEnc->sCmn.indices.signalType = TYPE_UNVOICED; Chris@69: psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1; Chris@69: } Chris@69: } Chris@69: Chris@69: /****************/ Chris@69: /* Encode frame */ Chris@69: /****************/ Chris@69: opus_int silk_encode_frame_FLP( Chris@69: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ Chris@69: opus_int32 *pnBytesOut, /* O Number of payload bytes; */ Chris@69: ec_enc *psRangeEnc, /* I/O compressor data structure */ Chris@69: opus_int condCoding, /* I The type of conditional coding to use */ Chris@69: opus_int maxBits, /* I If > 0: maximum number of output bits */ Chris@69: opus_int useCBR /* I Flag to force constant-bitrate operation */ Chris@69: ) Chris@69: { Chris@69: silk_encoder_control_FLP sEncCtrl; Chris@69: opus_int i, iter, maxIter, found_upper, found_lower, ret = 0; Chris@69: silk_float *x_frame, *res_pitch_frame; Chris@69: silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ]; Chris@69: ec_enc sRangeEnc_copy, sRangeEnc_copy2; Chris@69: silk_nsq_state sNSQ_copy, sNSQ_copy2; Chris@69: opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper; Chris@69: opus_int32 gainsID, gainsID_lower, gainsID_upper; Chris@69: opus_int16 gainMult_Q8; Chris@69: opus_int16 ec_prevLagIndex_copy; Chris@69: opus_int ec_prevSignalType_copy; Chris@69: opus_int8 LastGainIndex_copy2; Chris@69: opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; Chris@69: opus_uint8 ec_buf_copy[ 1275 ]; Chris@69: opus_int gain_lock[ MAX_NB_SUBFR ] = {0}; Chris@69: opus_int16 best_gain_mult[ MAX_NB_SUBFR ]; Chris@69: opus_int best_sum[ MAX_NB_SUBFR ]; Chris@69: Chris@69: /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */ Chris@69: LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0; Chris@69: Chris@69: psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3; Chris@69: Chris@69: /**************************************************************/ Chris@69: /* Set up Input Pointers, and insert frame in input buffer */ Chris@69: /**************************************************************/ Chris@69: /* pointers aligned with start of frame to encode */ Chris@69: x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; /* start of frame to encode */ Chris@69: res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; /* start of pitch LPC residual frame */ Chris@69: Chris@69: /***************************************/ Chris@69: /* Ensure smooth bandwidth transitions */ Chris@69: /***************************************/ Chris@69: silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length ); Chris@69: Chris@69: /*******************************************/ Chris@69: /* Copy new frame to front of input buffer */ Chris@69: /*******************************************/ Chris@69: silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length ); Chris@69: Chris@69: /* Add tiny signal to avoid high CPU load from denormalized floating point numbers */ Chris@69: for( i = 0; i < 8; i++ ) { Chris@69: x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f; Chris@69: } Chris@69: Chris@69: if( !psEnc->sCmn.prefillFlag ) { Chris@69: /*****************************************/ Chris@69: /* Find pitch lags, initial LPC analysis */ Chris@69: /*****************************************/ Chris@69: silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch ); Chris@69: Chris@69: /************************/ Chris@69: /* Noise shape analysis */ Chris@69: /************************/ Chris@69: silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame ); Chris@69: Chris@69: /***************************************************/ Chris@69: /* Find linear prediction coefficients (LPC + LTP) */ Chris@69: /***************************************************/ Chris@69: silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame, condCoding ); Chris@69: Chris@69: /****************************************/ Chris@69: /* Process gains */ Chris@69: /****************************************/ Chris@69: silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding ); Chris@69: Chris@69: /****************************************/ Chris@69: /* Low Bitrate Redundant Encoding */ Chris@69: /****************************************/ Chris@69: silk_LBRR_encode_FLP( psEnc, &sEncCtrl, x_frame, condCoding ); Chris@69: Chris@69: /* Loop over quantizer and entroy coding to control bitrate */ Chris@69: maxIter = 6; Chris@69: gainMult_Q8 = SILK_FIX_CONST( 1, 8 ); Chris@69: found_lower = 0; Chris@69: found_upper = 0; Chris@69: gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); Chris@69: gainsID_lower = -1; Chris@69: gainsID_upper = -1; Chris@69: /* Copy part of the input state */ Chris@69: silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) ); Chris@69: silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); Chris@69: seed_copy = psEnc->sCmn.indices.Seed; Chris@69: ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex; Chris@69: ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType; Chris@69: for( iter = 0; ; iter++ ) { Chris@69: if( gainsID == gainsID_lower ) { Chris@69: nBits = nBits_lower; Chris@69: } else if( gainsID == gainsID_upper ) { Chris@69: nBits = nBits_upper; Chris@69: } else { Chris@69: /* Restore part of the input state */ Chris@69: if( iter > 0 ) { Chris@69: silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) ); Chris@69: silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) ); Chris@69: psEnc->sCmn.indices.Seed = seed_copy; Chris@69: psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy; Chris@69: psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy; Chris@69: } Chris@69: Chris@69: /*****************************************/ Chris@69: /* Noise shaping quantization */ Chris@69: /*****************************************/ Chris@69: silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, x_frame ); Chris@69: Chris@69: if ( iter == maxIter && !found_lower ) { Chris@69: silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) ); Chris@69: } Chris@69: Chris@69: /****************************************/ Chris@69: /* Encode Parameters */ Chris@69: /****************************************/ Chris@69: silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding ); Chris@69: Chris@69: /****************************************/ Chris@69: /* Encode Excitation Signal */ Chris@69: /****************************************/ Chris@69: silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType, Chris@69: psEnc->sCmn.pulses, psEnc->sCmn.frame_length ); Chris@69: Chris@69: nBits = ec_tell( psRangeEnc ); Chris@69: Chris@69: /* If we still bust after the last iteration, do some damage control. */ Chris@69: if ( iter == maxIter && !found_lower && nBits > maxBits ) { Chris@69: silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) ); Chris@69: Chris@69: /* Keep gains the same as the last frame. */ Chris@69: psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev; Chris@69: for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: psEnc->sCmn.indices.GainsIndices[ i ] = 4; Chris@69: } Chris@69: if (condCoding != CODE_CONDITIONALLY) { Chris@69: psEnc->sCmn.indices.GainsIndices[ 0 ] = sEncCtrl.lastGainIndexPrev; Chris@69: } Chris@69: psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy; Chris@69: psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy; Chris@69: /* Clear all pulses. */ Chris@69: for ( i = 0; i < psEnc->sCmn.frame_length; i++ ) { Chris@69: psEnc->sCmn.pulses[ i ] = 0; Chris@69: } Chris@69: Chris@69: silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding ); Chris@69: Chris@69: silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType, Chris@69: psEnc->sCmn.pulses, psEnc->sCmn.frame_length ); Chris@69: Chris@69: nBits = ec_tell( psRangeEnc ); Chris@69: } Chris@69: Chris@69: if( useCBR == 0 && iter == 0 && nBits <= maxBits ) { Chris@69: break; Chris@69: } Chris@69: } Chris@69: Chris@69: if( iter == maxIter ) { Chris@69: if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) { Chris@69: /* Restore output state from earlier iteration that did meet the bitrate budget */ Chris@69: silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) ); Chris@69: celt_assert( sRangeEnc_copy2.offs <= 1275 ); Chris@69: silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs ); Chris@69: silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) ); Chris@69: psEnc->sShape.LastGainIndex = LastGainIndex_copy2; Chris@69: } Chris@69: break; Chris@69: } Chris@69: Chris@69: if( nBits > maxBits ) { Chris@69: if( found_lower == 0 && iter >= 2 ) { Chris@69: /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */ Chris@69: sEncCtrl.Lambda = silk_max_float(sEncCtrl.Lambda*1.5f, 1.5f); Chris@69: /* Reducing dithering can help us hit the target. */ Chris@69: psEnc->sCmn.indices.quantOffsetType = 0; Chris@69: found_upper = 0; Chris@69: gainsID_upper = -1; Chris@69: } else { Chris@69: found_upper = 1; Chris@69: nBits_upper = nBits; Chris@69: gainMult_upper = gainMult_Q8; Chris@69: gainsID_upper = gainsID; Chris@69: } Chris@69: } else if( nBits < maxBits - 5 ) { Chris@69: found_lower = 1; Chris@69: nBits_lower = nBits; Chris@69: gainMult_lower = gainMult_Q8; Chris@69: if( gainsID != gainsID_lower ) { Chris@69: gainsID_lower = gainsID; Chris@69: /* Copy part of the output state */ Chris@69: silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) ); Chris@69: celt_assert( psRangeEnc->offs <= 1275 ); Chris@69: silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs ); Chris@69: silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); Chris@69: LastGainIndex_copy2 = psEnc->sShape.LastGainIndex; Chris@69: } Chris@69: } else { Chris@69: /* Within 5 bits of budget: close enough */ Chris@69: break; Chris@69: } Chris@69: Chris@69: if ( !found_lower && nBits > maxBits ) { Chris@69: int j; Chris@69: for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: int sum=0; Chris@69: for ( j = i*psEnc->sCmn.subfr_length; j < (i+1)*psEnc->sCmn.subfr_length; j++ ) { Chris@69: sum += abs( psEnc->sCmn.pulses[j] ); Chris@69: } Chris@69: if ( iter == 0 || (sum < best_sum[i] && !gain_lock[i]) ) { Chris@69: best_sum[i] = sum; Chris@69: best_gain_mult[i] = gainMult_Q8; Chris@69: } else { Chris@69: gain_lock[i] = 1; Chris@69: } Chris@69: } Chris@69: } Chris@69: if( ( found_lower & found_upper ) == 0 ) { Chris@69: /* Adjust gain according to high-rate rate/distortion curve */ Chris@69: if( nBits > maxBits ) { Chris@69: if (gainMult_Q8 < 16384) { Chris@69: gainMult_Q8 *= 2; Chris@69: } else { Chris@69: gainMult_Q8 = 32767; Chris@69: } Chris@69: } else { Chris@69: opus_int32 gain_factor_Q16; Chris@69: gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) ); Chris@69: gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 ); Chris@69: } Chris@69: } else { Chris@69: /* Adjust gain by interpolating */ Chris@69: gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower ); Chris@69: /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */ Chris@69: if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) { Chris@69: gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ); Chris@69: } else Chris@69: if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) { Chris@69: gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ); Chris@69: } Chris@69: } Chris@69: Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: opus_int16 tmp; Chris@69: if ( gain_lock[i] ) { Chris@69: tmp = best_gain_mult[i]; Chris@69: } else { Chris@69: tmp = gainMult_Q8; Chris@69: } Chris@69: pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], tmp ), 8 ); Chris@69: } Chris@69: Chris@69: /* Quantize gains */ Chris@69: psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev; Chris@69: silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, Chris@69: &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); Chris@69: Chris@69: /* Unique identifier of gains vector */ Chris@69: gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); Chris@69: Chris@69: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f; Chris@69: } Chris@69: } Chris@69: } Chris@69: Chris@69: /* Update input buffer */ Chris@69: silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ], Chris@69: ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) ); Chris@69: Chris@69: /* Exit without entropy coding */ Chris@69: if( psEnc->sCmn.prefillFlag ) { Chris@69: /* No payload */ Chris@69: *pnBytesOut = 0; Chris@69: return ret; Chris@69: } Chris@69: Chris@69: /* Parameters needed for next frame */ Chris@69: psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ]; Chris@69: psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType; Chris@69: Chris@69: /****************************************/ Chris@69: /* Finalize payload */ Chris@69: /****************************************/ Chris@69: psEnc->sCmn.first_frame_after_reset = 0; Chris@69: /* Payload size */ Chris@69: *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 ); Chris@69: Chris@69: return ret; Chris@69: } Chris@69: Chris@69: /* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */ Chris@69: static OPUS_INLINE void silk_LBRR_encode_FLP( Chris@69: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ Chris@69: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ Chris@69: const silk_float xfw[], /* I Input signal */ Chris@69: opus_int condCoding /* I The type of conditional coding used so far for this frame */ Chris@69: ) Chris@69: { Chris@69: opus_int k; Chris@69: opus_int32 Gains_Q16[ MAX_NB_SUBFR ]; Chris@69: silk_float TempGains[ MAX_NB_SUBFR ]; Chris@69: SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ]; Chris@69: silk_nsq_state sNSQ_LBRR; Chris@69: Chris@69: /*******************************************/ Chris@69: /* Control use of inband LBRR */ Chris@69: /*******************************************/ Chris@69: if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) { Chris@69: psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1; Chris@69: Chris@69: /* Copy noise shaping quantizer state and quantization indices from regular encoding */ Chris@69: silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); Chris@69: silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) ); Chris@69: Chris@69: /* Save original gains */ Chris@69: silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) ); Chris@69: Chris@69: if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) { Chris@69: /* First frame in packet or previous frame not LBRR coded */ Chris@69: psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex; Chris@69: Chris@69: /* Increase Gains to get target LBRR rate */ Chris@69: psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases; Chris@69: psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 ); Chris@69: } Chris@69: Chris@69: /* Decode to get gains in sync with decoder */ Chris@69: silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices, Chris@69: &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); Chris@69: Chris@69: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ Chris@69: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { Chris@69: psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f ); Chris@69: } Chris@69: Chris@69: /*****************************************/ Chris@69: /* Noise shaping quantization */ Chris@69: /*****************************************/ Chris@69: silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR, Chris@69: psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw ); Chris@69: Chris@69: /* Restore original gains */ Chris@69: silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) ); Chris@69: } Chris@69: }