cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include cannam@154: #include "main_FLP.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: /* Low Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode with lower bitrate */ cannam@154: static OPUS_INLINE void silk_LBRR_encode_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ cannam@154: const silk_float xfw[], /* I Input signal */ cannam@154: opus_int condCoding /* I The type of conditional coding used so far for this frame */ cannam@154: ); cannam@154: cannam@154: void silk_encode_do_VAD_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: opus_int activity /* I Decision of Opus voice activity detector */ cannam@154: ) cannam@154: { cannam@154: const opus_int activity_threshold = SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ); cannam@154: cannam@154: /****************************/ cannam@154: /* Voice Activity Detection */ cannam@154: /****************************/ cannam@154: silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch ); cannam@154: /* If Opus VAD is inactive and Silk VAD is active: lower Silk VAD to just under the threshold */ cannam@154: if( activity == VAD_NO_ACTIVITY && psEnc->sCmn.speech_activity_Q8 >= activity_threshold ) { cannam@154: psEnc->sCmn.speech_activity_Q8 = activity_threshold - 1; cannam@154: } cannam@154: cannam@154: /**************************************************/ cannam@154: /* Convert speech activity into VAD and DTX flags */ cannam@154: /**************************************************/ cannam@154: if( psEnc->sCmn.speech_activity_Q8 < activity_threshold ) { cannam@154: psEnc->sCmn.indices.signalType = TYPE_NO_VOICE_ACTIVITY; cannam@154: psEnc->sCmn.noSpeechCounter++; cannam@154: if( psEnc->sCmn.noSpeechCounter <= NB_SPEECH_FRAMES_BEFORE_DTX ) { cannam@154: psEnc->sCmn.inDTX = 0; cannam@154: } else if( psEnc->sCmn.noSpeechCounter > MAX_CONSECUTIVE_DTX + NB_SPEECH_FRAMES_BEFORE_DTX ) { cannam@154: psEnc->sCmn.noSpeechCounter = NB_SPEECH_FRAMES_BEFORE_DTX; cannam@154: psEnc->sCmn.inDTX = 0; cannam@154: } cannam@154: psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 0; cannam@154: } else { cannam@154: psEnc->sCmn.noSpeechCounter = 0; cannam@154: psEnc->sCmn.inDTX = 0; cannam@154: psEnc->sCmn.indices.signalType = TYPE_UNVOICED; cannam@154: psEnc->sCmn.VAD_flags[ psEnc->sCmn.nFramesEncoded ] = 1; cannam@154: } cannam@154: } cannam@154: cannam@154: /****************/ cannam@154: /* Encode frame */ cannam@154: /****************/ cannam@154: opus_int silk_encode_frame_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: opus_int32 *pnBytesOut, /* O Number of payload bytes; */ cannam@154: ec_enc *psRangeEnc, /* I/O compressor data structure */ cannam@154: opus_int condCoding, /* I The type of conditional coding to use */ cannam@154: opus_int maxBits, /* I If > 0: maximum number of output bits */ cannam@154: opus_int useCBR /* I Flag to force constant-bitrate operation */ cannam@154: ) cannam@154: { cannam@154: silk_encoder_control_FLP sEncCtrl; cannam@154: opus_int i, iter, maxIter, found_upper, found_lower, ret = 0; cannam@154: silk_float *x_frame, *res_pitch_frame; cannam@154: silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ]; cannam@154: ec_enc sRangeEnc_copy, sRangeEnc_copy2; cannam@154: silk_nsq_state sNSQ_copy, sNSQ_copy2; cannam@154: opus_int32 seed_copy, nBits, nBits_lower, nBits_upper, gainMult_lower, gainMult_upper; cannam@154: opus_int32 gainsID, gainsID_lower, gainsID_upper; cannam@154: opus_int16 gainMult_Q8; cannam@154: opus_int16 ec_prevLagIndex_copy; cannam@154: opus_int ec_prevSignalType_copy; cannam@154: opus_int8 LastGainIndex_copy2; cannam@154: opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; cannam@154: opus_uint8 ec_buf_copy[ 1275 ]; cannam@154: opus_int gain_lock[ MAX_NB_SUBFR ] = {0}; cannam@154: opus_int16 best_gain_mult[ MAX_NB_SUBFR ]; cannam@154: opus_int best_sum[ MAX_NB_SUBFR ]; cannam@154: cannam@154: /* This is totally unnecessary but many compilers (including gcc) are too dumb to realise it */ cannam@154: LastGainIndex_copy2 = nBits_lower = nBits_upper = gainMult_lower = gainMult_upper = 0; cannam@154: cannam@154: psEnc->sCmn.indices.Seed = psEnc->sCmn.frameCounter++ & 3; cannam@154: cannam@154: /**************************************************************/ cannam@154: /* Set up Input Pointers, and insert frame in input buffer */ cannam@154: /**************************************************************/ cannam@154: /* pointers aligned with start of frame to encode */ cannam@154: x_frame = psEnc->x_buf + psEnc->sCmn.ltp_mem_length; /* start of frame to encode */ cannam@154: res_pitch_frame = res_pitch + psEnc->sCmn.ltp_mem_length; /* start of pitch LPC residual frame */ cannam@154: cannam@154: /***************************************/ cannam@154: /* Ensure smooth bandwidth transitions */ cannam@154: /***************************************/ cannam@154: silk_LP_variable_cutoff( &psEnc->sCmn.sLP, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length ); cannam@154: cannam@154: /*******************************************/ cannam@154: /* Copy new frame to front of input buffer */ cannam@154: /*******************************************/ cannam@154: silk_short2float_array( x_frame + LA_SHAPE_MS * psEnc->sCmn.fs_kHz, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.frame_length ); cannam@154: cannam@154: /* Add tiny signal to avoid high CPU load from denormalized floating point numbers */ cannam@154: for( i = 0; i < 8; i++ ) { cannam@154: x_frame[ LA_SHAPE_MS * psEnc->sCmn.fs_kHz + i * ( psEnc->sCmn.frame_length >> 3 ) ] += ( 1 - ( i & 2 ) ) * 1e-6f; cannam@154: } cannam@154: cannam@154: if( !psEnc->sCmn.prefillFlag ) { cannam@154: /*****************************************/ cannam@154: /* Find pitch lags, initial LPC analysis */ cannam@154: /*****************************************/ cannam@154: silk_find_pitch_lags_FLP( psEnc, &sEncCtrl, res_pitch, x_frame, psEnc->sCmn.arch ); cannam@154: cannam@154: /************************/ cannam@154: /* Noise shape analysis */ cannam@154: /************************/ cannam@154: silk_noise_shape_analysis_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame ); cannam@154: cannam@154: /***************************************************/ cannam@154: /* Find linear prediction coefficients (LPC + LTP) */ cannam@154: /***************************************************/ cannam@154: silk_find_pred_coefs_FLP( psEnc, &sEncCtrl, res_pitch_frame, x_frame, condCoding ); cannam@154: cannam@154: /****************************************/ cannam@154: /* Process gains */ cannam@154: /****************************************/ cannam@154: silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding ); cannam@154: cannam@154: /****************************************/ cannam@154: /* Low Bitrate Redundant Encoding */ cannam@154: /****************************************/ cannam@154: silk_LBRR_encode_FLP( psEnc, &sEncCtrl, x_frame, condCoding ); cannam@154: cannam@154: /* Loop over quantizer and entroy coding to control bitrate */ cannam@154: maxIter = 6; cannam@154: gainMult_Q8 = SILK_FIX_CONST( 1, 8 ); cannam@154: found_lower = 0; cannam@154: found_upper = 0; cannam@154: gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); cannam@154: gainsID_lower = -1; cannam@154: gainsID_upper = -1; cannam@154: /* Copy part of the input state */ cannam@154: silk_memcpy( &sRangeEnc_copy, psRangeEnc, sizeof( ec_enc ) ); cannam@154: silk_memcpy( &sNSQ_copy, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); cannam@154: seed_copy = psEnc->sCmn.indices.Seed; cannam@154: ec_prevLagIndex_copy = psEnc->sCmn.ec_prevLagIndex; cannam@154: ec_prevSignalType_copy = psEnc->sCmn.ec_prevSignalType; cannam@154: for( iter = 0; ; iter++ ) { cannam@154: if( gainsID == gainsID_lower ) { cannam@154: nBits = nBits_lower; cannam@154: } else if( gainsID == gainsID_upper ) { cannam@154: nBits = nBits_upper; cannam@154: } else { cannam@154: /* Restore part of the input state */ cannam@154: if( iter > 0 ) { cannam@154: silk_memcpy( psRangeEnc, &sRangeEnc_copy, sizeof( ec_enc ) ); cannam@154: silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy, sizeof( silk_nsq_state ) ); cannam@154: psEnc->sCmn.indices.Seed = seed_copy; cannam@154: psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy; cannam@154: psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy; cannam@154: } cannam@154: cannam@154: /*****************************************/ cannam@154: /* Noise shaping quantization */ cannam@154: /*****************************************/ cannam@154: silk_NSQ_wrapper_FLP( psEnc, &sEncCtrl, &psEnc->sCmn.indices, &psEnc->sCmn.sNSQ, psEnc->sCmn.pulses, x_frame ); cannam@154: cannam@154: if ( iter == maxIter && !found_lower ) { cannam@154: silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) ); cannam@154: } cannam@154: cannam@154: /****************************************/ cannam@154: /* Encode Parameters */ cannam@154: /****************************************/ cannam@154: silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding ); cannam@154: cannam@154: /****************************************/ cannam@154: /* Encode Excitation Signal */ cannam@154: /****************************************/ cannam@154: silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType, cannam@154: psEnc->sCmn.pulses, psEnc->sCmn.frame_length ); cannam@154: cannam@154: nBits = ec_tell( psRangeEnc ); cannam@154: cannam@154: /* If we still bust after the last iteration, do some damage control. */ cannam@154: if ( iter == maxIter && !found_lower && nBits > maxBits ) { cannam@154: silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) ); cannam@154: cannam@154: /* Keep gains the same as the last frame. */ cannam@154: psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev; cannam@154: for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: psEnc->sCmn.indices.GainsIndices[ i ] = 4; cannam@154: } cannam@154: if (condCoding != CODE_CONDITIONALLY) { cannam@154: psEnc->sCmn.indices.GainsIndices[ 0 ] = sEncCtrl.lastGainIndexPrev; cannam@154: } cannam@154: psEnc->sCmn.ec_prevLagIndex = ec_prevLagIndex_copy; cannam@154: psEnc->sCmn.ec_prevSignalType = ec_prevSignalType_copy; cannam@154: /* Clear all pulses. */ cannam@154: for ( i = 0; i < psEnc->sCmn.frame_length; i++ ) { cannam@154: psEnc->sCmn.pulses[ i ] = 0; cannam@154: } cannam@154: cannam@154: silk_encode_indices( &psEnc->sCmn, psRangeEnc, psEnc->sCmn.nFramesEncoded, 0, condCoding ); cannam@154: cannam@154: silk_encode_pulses( psRangeEnc, psEnc->sCmn.indices.signalType, psEnc->sCmn.indices.quantOffsetType, cannam@154: psEnc->sCmn.pulses, psEnc->sCmn.frame_length ); cannam@154: cannam@154: nBits = ec_tell( psRangeEnc ); cannam@154: } cannam@154: cannam@154: if( useCBR == 0 && iter == 0 && nBits <= maxBits ) { cannam@154: break; cannam@154: } cannam@154: } cannam@154: cannam@154: if( iter == maxIter ) { cannam@154: if( found_lower && ( gainsID == gainsID_lower || nBits > maxBits ) ) { cannam@154: /* Restore output state from earlier iteration that did meet the bitrate budget */ cannam@154: silk_memcpy( psRangeEnc, &sRangeEnc_copy2, sizeof( ec_enc ) ); cannam@154: celt_assert( sRangeEnc_copy2.offs <= 1275 ); cannam@154: silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs ); cannam@154: silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, sizeof( silk_nsq_state ) ); cannam@154: psEnc->sShape.LastGainIndex = LastGainIndex_copy2; cannam@154: } cannam@154: break; cannam@154: } cannam@154: cannam@154: if( nBits > maxBits ) { cannam@154: if( found_lower == 0 && iter >= 2 ) { cannam@154: /* Adjust the quantizer's rate/distortion tradeoff and discard previous "upper" results */ cannam@154: sEncCtrl.Lambda = silk_max_float(sEncCtrl.Lambda*1.5f, 1.5f); cannam@154: /* Reducing dithering can help us hit the target. */ cannam@154: psEnc->sCmn.indices.quantOffsetType = 0; cannam@154: found_upper = 0; cannam@154: gainsID_upper = -1; cannam@154: } else { cannam@154: found_upper = 1; cannam@154: nBits_upper = nBits; cannam@154: gainMult_upper = gainMult_Q8; cannam@154: gainsID_upper = gainsID; cannam@154: } cannam@154: } else if( nBits < maxBits - 5 ) { cannam@154: found_lower = 1; cannam@154: nBits_lower = nBits; cannam@154: gainMult_lower = gainMult_Q8; cannam@154: if( gainsID != gainsID_lower ) { cannam@154: gainsID_lower = gainsID; cannam@154: /* Copy part of the output state */ cannam@154: silk_memcpy( &sRangeEnc_copy2, psRangeEnc, sizeof( ec_enc ) ); cannam@154: celt_assert( psRangeEnc->offs <= 1275 ); cannam@154: silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs ); cannam@154: silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); cannam@154: LastGainIndex_copy2 = psEnc->sShape.LastGainIndex; cannam@154: } cannam@154: } else { cannam@154: /* Within 5 bits of budget: close enough */ cannam@154: break; cannam@154: } cannam@154: cannam@154: if ( !found_lower && nBits > maxBits ) { cannam@154: int j; cannam@154: for ( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: int sum=0; cannam@154: for ( j = i*psEnc->sCmn.subfr_length; j < (i+1)*psEnc->sCmn.subfr_length; j++ ) { cannam@154: sum += abs( psEnc->sCmn.pulses[j] ); cannam@154: } cannam@154: if ( iter == 0 || (sum < best_sum[i] && !gain_lock[i]) ) { cannam@154: best_sum[i] = sum; cannam@154: best_gain_mult[i] = gainMult_Q8; cannam@154: } else { cannam@154: gain_lock[i] = 1; cannam@154: } cannam@154: } cannam@154: } cannam@154: if( ( found_lower & found_upper ) == 0 ) { cannam@154: /* Adjust gain according to high-rate rate/distortion curve */ cannam@154: if( nBits > maxBits ) { cannam@154: if (gainMult_Q8 < 16384) { cannam@154: gainMult_Q8 *= 2; cannam@154: } else { cannam@154: gainMult_Q8 = 32767; cannam@154: } cannam@154: } else { cannam@154: opus_int32 gain_factor_Q16; cannam@154: gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) ); cannam@154: gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 ); cannam@154: } cannam@154: } else { cannam@154: /* Adjust gain by interpolating */ cannam@154: gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower ); cannam@154: /* New gain multplier must be between 25% and 75% of old range (note that gainMult_upper < gainMult_lower) */ cannam@154: if( gainMult_Q8 > silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ) ) { cannam@154: gainMult_Q8 = silk_ADD_RSHIFT32( gainMult_lower, gainMult_upper - gainMult_lower, 2 ); cannam@154: } else cannam@154: if( gainMult_Q8 < silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ) ) { cannam@154: gainMult_Q8 = silk_SUB_RSHIFT32( gainMult_upper, gainMult_upper - gainMult_lower, 2 ); cannam@154: } cannam@154: } cannam@154: cannam@154: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: opus_int16 tmp; cannam@154: if ( gain_lock[i] ) { cannam@154: tmp = best_gain_mult[i]; cannam@154: } else { cannam@154: tmp = gainMult_Q8; cannam@154: } cannam@154: pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], tmp ), 8 ); cannam@154: } cannam@154: cannam@154: /* Quantize gains */ cannam@154: psEnc->sShape.LastGainIndex = sEncCtrl.lastGainIndexPrev; cannam@154: silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, cannam@154: &psEnc->sShape.LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Unique identifier of gains vector */ cannam@154: gainsID = silk_gains_ID( psEnc->sCmn.indices.GainsIndices, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ cannam@154: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: sEncCtrl.Gains[ i ] = pGains_Q16[ i ] / 65536.0f; cannam@154: } cannam@154: } cannam@154: } cannam@154: cannam@154: /* Update input buffer */ cannam@154: silk_memmove( psEnc->x_buf, &psEnc->x_buf[ psEnc->sCmn.frame_length ], cannam@154: ( psEnc->sCmn.ltp_mem_length + LA_SHAPE_MS * psEnc->sCmn.fs_kHz ) * sizeof( silk_float ) ); cannam@154: cannam@154: /* Exit without entropy coding */ cannam@154: if( psEnc->sCmn.prefillFlag ) { cannam@154: /* No payload */ cannam@154: *pnBytesOut = 0; cannam@154: return ret; cannam@154: } cannam@154: cannam@154: /* Parameters needed for next frame */ cannam@154: psEnc->sCmn.prevLag = sEncCtrl.pitchL[ psEnc->sCmn.nb_subfr - 1 ]; cannam@154: psEnc->sCmn.prevSignalType = psEnc->sCmn.indices.signalType; cannam@154: cannam@154: /****************************************/ cannam@154: /* Finalize payload */ cannam@154: /****************************************/ cannam@154: psEnc->sCmn.first_frame_after_reset = 0; cannam@154: /* Payload size */ cannam@154: *pnBytesOut = silk_RSHIFT( ec_tell( psRangeEnc ) + 7, 3 ); cannam@154: cannam@154: return ret; cannam@154: } cannam@154: cannam@154: /* Low-Bitrate Redundancy (LBRR) encoding. Reuse all parameters but encode excitation at lower bitrate */ cannam@154: static OPUS_INLINE void silk_LBRR_encode_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ cannam@154: const silk_float xfw[], /* I Input signal */ cannam@154: opus_int condCoding /* I The type of conditional coding used so far for this frame */ cannam@154: ) cannam@154: { cannam@154: opus_int k; cannam@154: opus_int32 Gains_Q16[ MAX_NB_SUBFR ]; cannam@154: silk_float TempGains[ MAX_NB_SUBFR ]; cannam@154: SideInfoIndices *psIndices_LBRR = &psEnc->sCmn.indices_LBRR[ psEnc->sCmn.nFramesEncoded ]; cannam@154: silk_nsq_state sNSQ_LBRR; cannam@154: cannam@154: /*******************************************/ cannam@154: /* Control use of inband LBRR */ cannam@154: /*******************************************/ cannam@154: if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) { cannam@154: psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1; cannam@154: cannam@154: /* Copy noise shaping quantizer state and quantization indices from regular encoding */ cannam@154: silk_memcpy( &sNSQ_LBRR, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); cannam@154: silk_memcpy( psIndices_LBRR, &psEnc->sCmn.indices, sizeof( SideInfoIndices ) ); cannam@154: cannam@154: /* Save original gains */ cannam@154: silk_memcpy( TempGains, psEncCtrl->Gains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) ); cannam@154: cannam@154: if( psEnc->sCmn.nFramesEncoded == 0 || psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded - 1 ] == 0 ) { cannam@154: /* First frame in packet or previous frame not LBRR coded */ cannam@154: psEnc->sCmn.LBRRprevLastGainIndex = psEnc->sShape.LastGainIndex; cannam@154: cannam@154: /* Increase Gains to get target LBRR rate */ cannam@154: psIndices_LBRR->GainsIndices[ 0 ] += psEnc->sCmn.LBRR_GainIncreases; cannam@154: psIndices_LBRR->GainsIndices[ 0 ] = silk_min_int( psIndices_LBRR->GainsIndices[ 0 ], N_LEVELS_QGAIN - 1 ); cannam@154: } cannam@154: cannam@154: /* Decode to get gains in sync with decoder */ cannam@154: silk_gains_dequant( Gains_Q16, psIndices_LBRR->GainsIndices, cannam@154: &psEnc->sCmn.LBRRprevLastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: psEncCtrl->Gains[ k ] = Gains_Q16[ k ] * ( 1.0f / 65536.0f ); cannam@154: } cannam@154: cannam@154: /*****************************************/ cannam@154: /* Noise shaping quantization */ cannam@154: /*****************************************/ cannam@154: silk_NSQ_wrapper_FLP( psEnc, psEncCtrl, psIndices_LBRR, &sNSQ_LBRR, cannam@154: psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw ); cannam@154: cannam@154: /* Restore original gains */ cannam@154: silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) ); cannam@154: } cannam@154: }