| /*********************************************************************** |
| 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 "main_FLP.h" |
| #include "tuning_parameters.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 */ |
| ) |
| { |
| /****************************/ |
| /* Voice Activity Detection */ |
| /****************************/ |
| silk_VAD_GetSA_Q8( &psEnc->sCmn, psEnc->sCmn.inputBuf + 1, psEnc->sCmn.arch ); |
| |
| /**************************************************/ |
| /* Convert speech activity into VAD and DTX flags */ |
| /**************************************************/ |
| if( psEnc->sCmn.speech_activity_Q8 < SILK_FIX_CONST( SPEECH_ACTIVITY_DTX_THRES, 8 ) ) { |
| 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 xfw[ MAX_FRAME_LENGTH ]; |
| silk_float res_pitch[ 2 * MAX_FRAME_LENGTH + LA_PITCH_MAX ]; |
| ec_enc sRangeEnc_copy, sRangeEnc_copy2; |
| silk_nsq_state sNSQ_copy, sNSQ_copy2; |
| 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_uint8 ec_buf_copy[ 1275 ]; |
| |
| /* 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 ) { |
| /*****************************************/ |
| /* 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, x_frame, condCoding ); |
| |
| /****************************************/ |
| /* Process gains */ |
| /****************************************/ |
| silk_process_gains_FLP( psEnc, &sEncCtrl, condCoding ); |
| |
| /*****************************************/ |
| /* Prefiltering for noise shaper */ |
| /*****************************************/ |
| silk_prefilter_FLP( psEnc, &sEncCtrl, xfw, x_frame ); |
| |
| /****************************************/ |
| /* Low Bitrate Redundant Encoding */ |
| /****************************************/ |
| silk_LBRR_encode_FLP( psEnc, &sEncCtrl, xfw, 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, &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; |
| 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, 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, xfw ); |
| |
| /****************************************/ |
| /* 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( 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 ) ); |
| silk_assert( sRangeEnc_copy2.offs <= 1275 ); |
| silk_memcpy( psRangeEnc->buf, ec_buf_copy, sRangeEnc_copy2.offs ); |
| silk_memcpy( &psEnc->sCmn.sNSQ, &sNSQ_copy2, 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 *= 1.5f; |
| found_upper = 0; |
| gainsID_upper = -1; |
| } else { |
| found_upper = 1; |
| nBits_upper = nBits; |
| gainMult_upper = gainMult_Q8; |
| gainsID_upper = gainsID; |
| } |
| } else if( nBits < maxBits - 5 ) { |
| 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 ) ); |
| silk_assert( psRangeEnc->offs <= 1275 ); |
| silk_memcpy( ec_buf_copy, psRangeEnc->buf, psRangeEnc->offs ); |
| silk_memcpy( &sNSQ_copy2, &psEnc->sCmn.sNSQ, sizeof( silk_nsq_state ) ); |
| LastGainIndex_copy2 = psEnc->sShape.LastGainIndex; |
| } |
| } else { |
| /* Within 5 bits of budget: close enough */ |
| break; |
| } |
| |
| if( ( found_lower & found_upper ) == 0 ) { |
| /* Adjust gain according to high-rate rate/distortion curve */ |
| opus_int32 gain_factor_Q16; |
| gain_factor_Q16 = silk_log2lin( silk_LSHIFT( nBits - maxBits, 7 ) / psEnc->sCmn.frame_length + SILK_FIX_CONST( 16, 7 ) ); |
| gain_factor_Q16 = silk_min_32( gain_factor_Q16, SILK_FIX_CONST( 2, 16 ) ); |
| if( nBits > maxBits ) { |
| gain_factor_Q16 = silk_max_32( gain_factor_Q16, SILK_FIX_CONST( 1.3, 16 ) ); |
| } |
| gainMult_Q8 = silk_SMULWB( gain_factor_Q16, gainMult_Q8 ); |
| } else { |
| /* Adjust gain by interpolating */ |
| gainMult_Q8 = gainMult_lower + ( ( gainMult_upper - gainMult_lower ) * ( maxBits - nBits_lower ) ) / ( nBits_upper - nBits_lower ); |
| /* New gain multplier 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++ ) { |
| pGains_Q16[ i ] = silk_LSHIFT_SAT32( silk_SMULWB( sEncCtrl.GainsUnq_Q16[ i ], gainMult_Q8 ), 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; |
| 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 ); |
| |
| 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 ]; |
| silk_nsq_state sNSQ_LBRR; |
| |
| /*******************************************/ |
| /* Control use of inband LBRR */ |
| /*******************************************/ |
| if( psEnc->sCmn.LBRR_enabled && psEnc->sCmn.speech_activity_Q8 > SILK_FIX_CONST( LBRR_SPEECH_ACTIVITY_THRES, 8 ) ) { |
| psEnc->sCmn.LBRR_flags[ psEnc->sCmn.nFramesEncoded ] = 1; |
| |
| /* Copy noise shaping quantizer state and quantization indices from regular encoding */ |
| silk_memcpy( &sNSQ_LBRR, &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, |
| psEnc->sCmn.pulses_LBRR[ psEnc->sCmn.nFramesEncoded ], xfw ); |
| |
| /* Restore original gains */ |
| silk_memcpy( psEncCtrl->Gains, TempGains, psEnc->sCmn.nb_subfr * sizeof( silk_float ) ); |
| } |
| } |
