| /*********************************************************************** |
| 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 |
| |
| /*********************************************************** |
| * Pitch analyser function |
| ********************************************************** */ |
| #include "SigProc_FIX.h" |
| #include "pitch_est_defines.h" |
| #include "debug.h" |
| |
| #define SCRATCH_SIZE 22 |
| |
| /************************************************************/ |
| /* Internally used functions */ |
| /************************************************************/ |
| void silk_P_Ana_calc_corr_st3( |
| opus_int32 cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ],/* (O) 3 DIM correlation array */ |
| const opus_int16 frame[], /* I vector to correlate */ |
| opus_int start_lag, /* I lag offset to search around */ |
| opus_int sf_length, /* I length of a 5 ms subframe */ |
| opus_int nb_subfr, /* I number of subframes */ |
| opus_int complexity /* I Complexity setting */ |
| ); |
| |
| void silk_P_Ana_calc_energy_st3( |
| opus_int32 energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ],/* (O) 3 DIM energy array */ |
| const opus_int16 frame[], /* I vector to calc energy in */ |
| opus_int start_lag, /* I lag offset to search around */ |
| opus_int sf_length, /* I length of one 5 ms subframe */ |
| opus_int nb_subfr, /* I number of subframes */ |
| opus_int complexity /* I Complexity setting */ |
| ); |
| |
| opus_int32 silk_P_Ana_find_scaling( |
| const opus_int16 *frame, |
| const opus_int frame_length, |
| const opus_int sum_sqr_len |
| ); |
| |
| /*************************************************************/ |
| /* FIXED POINT CORE PITCH ANALYSIS FUNCTION */ |
| /*************************************************************/ |
| opus_int silk_pitch_analysis_core( /* O Voicing estimate: 0 voiced, 1 unvoiced */ |
| const opus_int16 *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ |
| opus_int *pitch_out, /* O 4 pitch lag values */ |
| opus_int16 *lagIndex, /* O Lag Index */ |
| opus_int8 *contourIndex, /* O Pitch contour Index */ |
| opus_int *LTPCorr_Q15, /* I/O Normalized correlation; input: value from previous frame */ |
| opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */ |
| const opus_int32 search_thres1_Q16, /* I First stage threshold for lag candidates 0 - 1 */ |
| const opus_int search_thres2_Q15, /* I Final threshold for lag candidates 0 - 1 */ |
| const opus_int Fs_kHz, /* I Sample frequency (kHz) */ |
| const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ |
| const opus_int nb_subfr /* I number of 5 ms subframes */ |
| ) |
| { |
| opus_int16 frame_8kHz[ PE_MAX_FRAME_LENGTH_ST_2 ]; |
| opus_int16 frame_4kHz[ PE_MAX_FRAME_LENGTH_ST_1 ]; |
| opus_int32 filt_state[ 6 ]; |
| opus_int32 scratch_mem[ 3 * PE_MAX_FRAME_LENGTH ]; |
| opus_int16 *input_frame_ptr; |
| opus_int i, k, d, j; |
| opus_int16 C[ PE_MAX_NB_SUBFR ][ ( PE_MAX_LAG >> 1 ) + 5 ]; |
| const opus_int16 *target_ptr, *basis_ptr; |
| opus_int32 cross_corr, normalizer, energy, shift, energy_basis, energy_target; |
| opus_int d_srch[ PE_D_SRCH_LENGTH ], Cmax, length_d_srch, length_d_comp; |
| opus_int16 d_comp[ ( PE_MAX_LAG >> 1 ) + 5 ]; |
| opus_int32 sum, threshold, temp32, lag_counter; |
| opus_int CBimax, CBimax_new, CBimax_old, lag, start_lag, end_lag, lag_new; |
| opus_int32 CC[ PE_NB_CBKS_STAGE2_EXT ], CCmax, CCmax_b, CCmax_new_b, CCmax_new; |
| opus_int32 energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ]; |
| opus_int32 crosscorr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ]; |
| opus_int frame_length, frame_length_8kHz, frame_length_4kHz, max_sum_sq_length; |
| opus_int sf_length, sf_length_8kHz, sf_length_4kHz; |
| opus_int min_lag, min_lag_8kHz, min_lag_4kHz; |
| opus_int max_lag, max_lag_8kHz, max_lag_4kHz; |
| opus_int32 contour_bias_Q20, diff, lz, lshift; |
| opus_int nb_cbk_search, cbk_size; |
| opus_int32 delta_lag_log2_sqr_Q7, lag_log2_Q7, prevLag_log2_Q7, prev_lag_bias_Q15, corr_thres_Q15; |
| const opus_int8 *Lag_CB_ptr; |
| /* Check for valid sampling frequency */ |
| silk_assert( Fs_kHz == 8 || Fs_kHz == 12 || Fs_kHz == 16 ); |
| |
| /* Check for valid complexity setting */ |
| silk_assert( complexity >= SILK_PE_MIN_COMPLEX ); |
| silk_assert( complexity <= SILK_PE_MAX_COMPLEX ); |
| |
| silk_assert( search_thres1_Q16 >= 0 && search_thres1_Q16 <= (1<<16) ); |
| silk_assert( search_thres2_Q15 >= 0 && search_thres2_Q15 <= (1<<15) ); |
| |
| /* Set up frame lengths max / min lag for the sampling frequency */ |
| frame_length = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * Fs_kHz; |
| frame_length_4kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 4; |
| frame_length_8kHz = ( PE_LTP_MEM_LENGTH_MS + nb_subfr * PE_SUBFR_LENGTH_MS ) * 8; |
| sf_length = PE_SUBFR_LENGTH_MS * Fs_kHz; |
| sf_length_4kHz = PE_SUBFR_LENGTH_MS * 4; |
| sf_length_8kHz = PE_SUBFR_LENGTH_MS * 8; |
| min_lag = PE_MIN_LAG_MS * Fs_kHz; |
| min_lag_4kHz = PE_MIN_LAG_MS * 4; |
| min_lag_8kHz = PE_MIN_LAG_MS * 8; |
| max_lag = PE_MAX_LAG_MS * Fs_kHz - 1; |
| max_lag_4kHz = PE_MAX_LAG_MS * 4; |
| max_lag_8kHz = PE_MAX_LAG_MS * 8 - 1; |
| |
| silk_memset( C, 0, sizeof( opus_int16 ) * nb_subfr * ( ( PE_MAX_LAG >> 1 ) + 5) ); |
| |
| /* Resample from input sampled at Fs_kHz to 8 kHz */ |
| if( Fs_kHz == 16 ) { |
| silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) ); |
| silk_resampler_down2( filt_state, frame_8kHz, frame, frame_length ); |
| } else if( Fs_kHz == 12 ) { |
| silk_memset( filt_state, 0, 6 * sizeof( opus_int32 ) ); |
| silk_resampler_down2_3( filt_state, frame_8kHz, frame, frame_length ); |
| } else { |
| silk_assert( Fs_kHz == 8 ); |
| silk_memcpy( frame_8kHz, frame, frame_length_8kHz * sizeof(opus_int16) ); |
| } |
| |
| /* Decimate again to 4 kHz */ |
| silk_memset( filt_state, 0, 2 * sizeof( opus_int32 ) );/* Set state to zero */ |
| silk_resampler_down2( filt_state, frame_4kHz, frame_8kHz, frame_length_8kHz ); |
| |
| /* Low-pass filter */ |
| for( i = frame_length_4kHz - 1; i > 0; i-- ) { |
| frame_4kHz[ i ] = silk_ADD_SAT16( frame_4kHz[ i ], frame_4kHz[ i - 1 ] ); |
| } |
| |
| /******************************************************************************* |
| ** Scale 4 kHz signal down to prevent correlations measures from overflowing |
| ** find scaling as max scaling for each 8kHz(?) subframe |
| *******************************************************************************/ |
| |
| /* Inner product is calculated with different lengths, so scale for the worst case */ |
| max_sum_sq_length = silk_max_32( sf_length_8kHz, silk_LSHIFT( sf_length_4kHz, 2 ) ); |
| shift = silk_P_Ana_find_scaling( frame_4kHz, frame_length_4kHz, max_sum_sq_length ); |
| if( shift > 0 ) { |
| for( i = 0; i < frame_length_4kHz; i++ ) { |
| frame_4kHz[ i ] = silk_RSHIFT( frame_4kHz[ i ], shift ); |
| } |
| } |
| |
| /****************************************************************************** |
| * FIRST STAGE, operating in 4 khz |
| ******************************************************************************/ |
| target_ptr = &frame_4kHz[ silk_LSHIFT( sf_length_4kHz, 2 ) ]; |
| for( k = 0; k < nb_subfr >> 1; k++ ) { |
| /* Check that we are within range of the array */ |
| silk_assert( target_ptr >= frame_4kHz ); |
| silk_assert( target_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz ); |
| |
| basis_ptr = target_ptr - min_lag_4kHz; |
| |
| /* Check that we are within range of the array */ |
| silk_assert( basis_ptr >= frame_4kHz ); |
| silk_assert( basis_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz ); |
| |
| /* Calculate first vector products before loop */ |
| cross_corr = silk_inner_prod_aligned( target_ptr, basis_ptr, sf_length_8kHz ); |
| normalizer = silk_inner_prod_aligned( basis_ptr, basis_ptr, sf_length_8kHz ); |
| normalizer = silk_ADD_SAT32( normalizer, silk_SMULBB( sf_length_8kHz, 4000 ) ); |
| |
| temp32 = silk_DIV32( cross_corr, silk_SQRT_APPROX( normalizer ) + 1 ); |
| C[ k ][ min_lag_4kHz ] = (opus_int16)silk_SAT16( temp32 ); /* Q0 */ |
| |
| /* From now on normalizer is computed recursively */ |
| for( d = min_lag_4kHz + 1; d <= max_lag_4kHz; d++ ) { |
| basis_ptr--; |
| |
| /* Check that we are within range of the array */ |
| silk_assert( basis_ptr >= frame_4kHz ); |
| silk_assert( basis_ptr + sf_length_8kHz <= frame_4kHz + frame_length_4kHz ); |
| |
| cross_corr = silk_inner_prod_aligned( target_ptr, basis_ptr, sf_length_8kHz ); |
| |
| /* Add contribution of new sample and remove contribution from oldest sample */ |
| normalizer += |
| silk_SMULBB( basis_ptr[ 0 ], basis_ptr[ 0 ] ) - |
| silk_SMULBB( basis_ptr[ sf_length_8kHz ], basis_ptr[ sf_length_8kHz ] ); |
| |
| temp32 = silk_DIV32( cross_corr, silk_SQRT_APPROX( normalizer ) + 1 ); |
| C[ k ][ d ] = (opus_int16)silk_SAT16( temp32 ); /* Q0 */ |
| } |
| /* Update target pointer */ |
| target_ptr += sf_length_8kHz; |
| } |
| |
| /* Combine two subframes into single correlation measure and apply short-lag bias */ |
| if( nb_subfr == PE_MAX_NB_SUBFR ) { |
| for( i = max_lag_4kHz; i >= min_lag_4kHz; i-- ) { |
| sum = (opus_int32)C[ 0 ][ i ] + (opus_int32)C[ 1 ][ i ]; /* Q0 */ |
| silk_assert( silk_RSHIFT( sum, 1 ) == silk_SAT16( silk_RSHIFT( sum, 1 ) ) ); |
| sum = silk_RSHIFT( sum, 1 ); /* Q-1 */ |
| silk_assert( silk_LSHIFT( (opus_int32)-i, 4 ) == silk_SAT16( silk_LSHIFT( (opus_int32)-i, 4 ) ) ); |
| sum = silk_SMLAWB( sum, sum, silk_LSHIFT( -i, 4 ) ); /* Q-1 */ |
| silk_assert( sum == silk_SAT16( sum ) ); |
| C[ 0 ][ i ] = (opus_int16)sum; /* Q-1 */ |
| } |
| } else { |
| /* Only short-lag bias */ |
| for( i = max_lag_4kHz; i >= min_lag_4kHz; i-- ) { |
| sum = (opus_int32)C[ 0 ][ i ]; |
| sum = silk_SMLAWB( sum, sum, silk_LSHIFT( -i, 4 ) ); /* Q-1 */ |
| C[ 0 ][ i ] = (opus_int16)sum; /* Q-1 */ |
| } |
| } |
| |
| /* Sort */ |
| length_d_srch = silk_ADD_LSHIFT32( 4, complexity, 1 ); |
| silk_assert( 3 * length_d_srch <= PE_D_SRCH_LENGTH ); |
| silk_insertion_sort_decreasing_int16( &C[ 0 ][ min_lag_4kHz ], d_srch, max_lag_4kHz - min_lag_4kHz + 1, length_d_srch ); |
| |
| /* Escape if correlation is very low already here */ |
| target_ptr = &frame_4kHz[ silk_SMULBB( sf_length_4kHz, nb_subfr ) ]; |
| energy = silk_inner_prod_aligned( target_ptr, target_ptr, silk_LSHIFT( sf_length_4kHz, 2 ) ); |
| energy = silk_ADD_SAT32( energy, 1000 ); /* Q0 */ |
| Cmax = (opus_int)C[ 0 ][ min_lag_4kHz ]; /* Q-1 */ |
| threshold = silk_SMULBB( Cmax, Cmax ); /* Q-2 */ |
| |
| /* Compare in Q-2 domain */ |
| if( silk_RSHIFT( energy, 4 + 2 ) > threshold ) { |
| silk_memset( pitch_out, 0, nb_subfr * sizeof( opus_int ) ); |
| *LTPCorr_Q15 = 0; |
| *lagIndex = 0; |
| *contourIndex = 0; |
| return 1; |
| } |
| |
| threshold = silk_SMULWB( search_thres1_Q16, Cmax ); |
| for( i = 0; i < length_d_srch; i++ ) { |
| /* Convert to 8 kHz indices for the sorted correlation that exceeds the threshold */ |
| if( C[ 0 ][ min_lag_4kHz + i ] > threshold ) { |
| d_srch[ i ] = silk_LSHIFT( d_srch[ i ] + min_lag_4kHz, 1 ); |
| } else { |
| length_d_srch = i; |
| break; |
| } |
| } |
| silk_assert( length_d_srch > 0 ); |
| |
| for( i = min_lag_8kHz - 5; i < max_lag_8kHz + 5; i++ ) { |
| d_comp[ i ] = 0; |
| } |
| for( i = 0; i < length_d_srch; i++ ) { |
| d_comp[ d_srch[ i ] ] = 1; |
| } |
| |
| /* Convolution */ |
| for( i = max_lag_8kHz + 3; i >= min_lag_8kHz; i-- ) { |
| d_comp[ i ] += d_comp[ i - 1 ] + d_comp[ i - 2 ]; |
| } |
| |
| length_d_srch = 0; |
| for( i = min_lag_8kHz; i < max_lag_8kHz + 1; i++ ) { |
| if( d_comp[ i + 1 ] > 0 ) { |
| d_srch[ length_d_srch ] = i; |
| length_d_srch++; |
| } |
| } |
| |
| /* Convolution */ |
| for( i = max_lag_8kHz + 3; i >= min_lag_8kHz; i-- ) { |
| d_comp[ i ] += d_comp[ i - 1 ] + d_comp[ i - 2 ] + d_comp[ i - 3 ]; |
| } |
| |
| length_d_comp = 0; |
| for( i = min_lag_8kHz; i < max_lag_8kHz + 4; i++ ) { |
| if( d_comp[ i ] > 0 ) { |
| d_comp[ length_d_comp ] = i - 2; |
| length_d_comp++; |
| } |
| } |
| |
| /********************************************************************************** |
| ** SECOND STAGE, operating at 8 kHz, on lag sections with high correlation |
| *************************************************************************************/ |
| |
| /****************************************************************************** |
| ** Scale signal down to avoid correlations measures from overflowing |
| *******************************************************************************/ |
| /* find scaling as max scaling for each subframe */ |
| shift = silk_P_Ana_find_scaling( frame_8kHz, frame_length_8kHz, sf_length_8kHz ); |
| if( shift > 0 ) { |
| for( i = 0; i < frame_length_8kHz; i++ ) { |
| frame_8kHz[ i ] = silk_RSHIFT( frame_8kHz[ i ], shift ); |
| } |
| } |
| |
| /********************************************************************************* |
| * Find energy of each subframe projected onto its history, for a range of delays |
| *********************************************************************************/ |
| silk_memset( C, 0, PE_MAX_NB_SUBFR * ( ( PE_MAX_LAG >> 1 ) + 5 ) * sizeof( opus_int16 ) ); |
| |
| target_ptr = &frame_8kHz[ PE_LTP_MEM_LENGTH_MS * 8 ]; |
| for( k = 0; k < nb_subfr; k++ ) { |
| |
| /* Check that we are within range of the array */ |
| silk_assert( target_ptr >= frame_8kHz ); |
| silk_assert( target_ptr + sf_length_8kHz <= frame_8kHz + frame_length_8kHz ); |
| |
| energy_target = silk_inner_prod_aligned( target_ptr, target_ptr, sf_length_8kHz ); |
| for( j = 0; j < length_d_comp; j++ ) { |
| d = d_comp[ j ]; |
| basis_ptr = target_ptr - d; |
| |
| /* Check that we are within range of the array */ |
| silk_assert( basis_ptr >= frame_8kHz ); |
| silk_assert( basis_ptr + sf_length_8kHz <= frame_8kHz + frame_length_8kHz ); |
| |
| cross_corr = silk_inner_prod_aligned( target_ptr, basis_ptr, sf_length_8kHz ); |
| energy_basis = silk_inner_prod_aligned( basis_ptr, basis_ptr, sf_length_8kHz ); |
| if( cross_corr > 0 ) { |
| energy = silk_max( energy_target, energy_basis ); /* Find max to make sure first division < 1.0 */ |
| lz = silk_CLZ32( cross_corr ); |
| lshift = silk_LIMIT_32( lz - 1, 0, 15 ); |
| temp32 = silk_DIV32( silk_LSHIFT( cross_corr, lshift ), silk_RSHIFT( energy, 15 - lshift ) + 1 ); /* Q15 */ |
| silk_assert( temp32 == silk_SAT16( temp32 ) ); |
| temp32 = silk_SMULWB( cross_corr, temp32 ); /* Q(-1), cc * ( cc / max(b, t) ) */ |
| temp32 = silk_ADD_SAT32( temp32, temp32 ); /* Q(0) */ |
| lz = silk_CLZ32( temp32 ); |
| lshift = silk_LIMIT_32( lz - 1, 0, 15 ); |
| energy = silk_min( energy_target, energy_basis ); |
| C[ k ][ d ] = silk_DIV32( silk_LSHIFT( temp32, lshift ), silk_RSHIFT( energy, 15 - lshift ) + 1 ); /* Q15*/ |
| } else { |
| C[ k ][ d ] = 0; |
| } |
| } |
| target_ptr += sf_length_8kHz; |
| } |
| |
| /* search over lag range and lags codebook */ |
| /* scale factor for lag codebook, as a function of center lag */ |
| |
| CCmax = silk_int32_MIN; |
| CCmax_b = silk_int32_MIN; |
| |
| CBimax = 0; /* To avoid returning undefined lag values */ |
| lag = -1; /* To check if lag with strong enough correlation has been found */ |
| |
| if( prevLag > 0 ) { |
| if( Fs_kHz == 12 ) { |
| prevLag = silk_DIV32_16( silk_LSHIFT( prevLag, 1 ), 3 ); |
| } else if( Fs_kHz == 16 ) { |
| prevLag = silk_RSHIFT( prevLag, 1 ); |
| } |
| prevLag_log2_Q7 = silk_lin2log( (opus_int32)prevLag ); |
| } else { |
| prevLag_log2_Q7 = 0; |
| } |
| silk_assert( search_thres2_Q15 == silk_SAT16( search_thres2_Q15 ) ); |
| /* Set up stage 2 codebook based on number of subframes */ |
| if( nb_subfr == PE_MAX_NB_SUBFR ) { |
| cbk_size = PE_NB_CBKS_STAGE2_EXT; |
| Lag_CB_ptr = &silk_CB_lags_stage2[ 0 ][ 0 ]; |
| if( Fs_kHz == 8 && complexity > SILK_PE_MIN_COMPLEX ) { |
| /* If input is 8 khz use a larger codebook here because it is last stage */ |
| nb_cbk_search = PE_NB_CBKS_STAGE2_EXT; |
| } else { |
| nb_cbk_search = PE_NB_CBKS_STAGE2; |
| } |
| corr_thres_Q15 = silk_RSHIFT( silk_SMULBB( search_thres2_Q15, search_thres2_Q15 ), 13 ); |
| } else { |
| cbk_size = PE_NB_CBKS_STAGE2_10MS; |
| Lag_CB_ptr = &silk_CB_lags_stage2_10_ms[ 0 ][ 0 ]; |
| nb_cbk_search = PE_NB_CBKS_STAGE2_10MS; |
| corr_thres_Q15 = silk_RSHIFT( silk_SMULBB( search_thres2_Q15, search_thres2_Q15 ), 14 ); |
| } |
| |
| for( k = 0; k < length_d_srch; k++ ) { |
| d = d_srch[ k ]; |
| for( j = 0; j < nb_cbk_search; j++ ) { |
| CC[ j ] = 0; |
| for( i = 0; i < nb_subfr; i++ ) { |
| /* Try all codebooks */ |
| CC[ j ] = CC[ j ] + (opus_int32)C[ i ][ d + matrix_ptr( Lag_CB_ptr, i, j, cbk_size )]; |
| } |
| } |
| /* Find best codebook */ |
| CCmax_new = silk_int32_MIN; |
| CBimax_new = 0; |
| for( i = 0; i < nb_cbk_search; i++ ) { |
| if( CC[ i ] > CCmax_new ) { |
| CCmax_new = CC[ i ]; |
| CBimax_new = i; |
| } |
| } |
| |
| /* Bias towards shorter lags */ |
| lag_log2_Q7 = silk_lin2log( (opus_int32)d ); /* Q7 */ |
| silk_assert( lag_log2_Q7 == silk_SAT16( lag_log2_Q7 ) ); |
| silk_assert( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 15 ) == silk_SAT16( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 15 ) ) ); |
| CCmax_new_b = CCmax_new - silk_RSHIFT( silk_SMULBB( nb_subfr * SILK_FIX_CONST( PE_SHORTLAG_BIAS, 15 ), lag_log2_Q7 ), 7 ); /* Q15 */ |
| |
| /* Bias towards previous lag */ |
| silk_assert( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 15 ) == silk_SAT16( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 15 ) ) ); |
| if( prevLag > 0 ) { |
| delta_lag_log2_sqr_Q7 = lag_log2_Q7 - prevLag_log2_Q7; |
| silk_assert( delta_lag_log2_sqr_Q7 == silk_SAT16( delta_lag_log2_sqr_Q7 ) ); |
| delta_lag_log2_sqr_Q7 = silk_RSHIFT( silk_SMULBB( delta_lag_log2_sqr_Q7, delta_lag_log2_sqr_Q7 ), 7 ); |
| prev_lag_bias_Q15 = silk_RSHIFT( silk_SMULBB( nb_subfr * SILK_FIX_CONST( PE_PREVLAG_BIAS, 15 ), *LTPCorr_Q15 ), 15 ); /* Q15 */ |
| prev_lag_bias_Q15 = silk_DIV32( silk_MUL( prev_lag_bias_Q15, delta_lag_log2_sqr_Q7 ), delta_lag_log2_sqr_Q7 + ( 1 << 6 ) ); |
| CCmax_new_b -= prev_lag_bias_Q15; /* Q15 */ |
| } |
| |
| if( CCmax_new_b > CCmax_b && /* Find maximum biased correlation */ |
| CCmax_new > corr_thres_Q15 && /* Correlation needs to be high enough to be voiced */ |
| silk_CB_lags_stage2[ 0 ][ CBimax_new ] <= min_lag_8kHz /* Lag must be in range */ |
| ) { |
| CCmax_b = CCmax_new_b; |
| CCmax = CCmax_new; |
| lag = d; |
| CBimax = CBimax_new; |
| } |
| } |
| |
| if( lag == -1 ) { |
| /* No suitable candidate found */ |
| silk_memset( pitch_out, 0, nb_subfr * sizeof( opus_int ) ); |
| *LTPCorr_Q15 = 0; |
| *lagIndex = 0; |
| *contourIndex = 0; |
| return 1; |
| } |
| |
| if( Fs_kHz > 8 ) { |
| /***************************************************************************/ |
| /* Scale input signal down to avoid correlations measures from overflowing */ |
| /***************************************************************************/ |
| /* find scaling as max scaling for each subframe */ |
| shift = silk_P_Ana_find_scaling( frame, frame_length, sf_length ); |
| if( shift > 0 ) { |
| /* Move signal to scratch mem because the input signal should be unchanged */ |
| /* Reuse the 32 bit scratch mem vector, use a 16 bit pointer from now */ |
| input_frame_ptr = (opus_int16*)scratch_mem; |
| for( i = 0; i < frame_length; i++ ) { |
| input_frame_ptr[ i ] = silk_RSHIFT( frame[ i ], shift ); |
| } |
| } else { |
| input_frame_ptr = (opus_int16*)frame; |
| } |
| |
| /* Search in original signal */ |
| |
| CBimax_old = CBimax; |
| /* Compensate for decimation */ |
| silk_assert( lag == silk_SAT16( lag ) ); |
| if( Fs_kHz == 12 ) { |
| lag = silk_RSHIFT( silk_SMULBB( lag, 3 ), 1 ); |
| } else if( Fs_kHz == 16 ) { |
| lag = silk_LSHIFT( lag, 1 ); |
| } else { |
| lag = silk_SMULBB( lag, 3 ); |
| } |
| |
| lag = silk_LIMIT_int( lag, min_lag, max_lag ); |
| start_lag = silk_max_int( lag - 2, min_lag ); |
| end_lag = silk_min_int( lag + 2, max_lag ); |
| lag_new = lag; /* to avoid undefined lag */ |
| CBimax = 0; /* to avoid undefined lag */ |
| silk_assert( silk_LSHIFT( CCmax, 13 ) >= 0 ); |
| *LTPCorr_Q15 = (opus_int)silk_SQRT_APPROX( silk_LSHIFT( CCmax, 13 ) ); /* Output normalized correlation */ |
| |
| CCmax = silk_int32_MIN; |
| /* pitch lags according to second stage */ |
| for( k = 0; k < nb_subfr; k++ ) { |
| pitch_out[ k ] = lag + 2 * silk_CB_lags_stage2[ k ][ CBimax_old ]; |
| } |
| /* Calculate the correlations and energies needed in stage 3 */ |
| silk_P_Ana_calc_corr_st3( crosscorr_st3, input_frame_ptr, start_lag, sf_length, nb_subfr, complexity ); |
| silk_P_Ana_calc_energy_st3( energies_st3, input_frame_ptr, start_lag, sf_length, nb_subfr, complexity ); |
| |
| lag_counter = 0; |
| silk_assert( lag == silk_SAT16( lag ) ); |
| contour_bias_Q20 = silk_DIV32_16( SILK_FIX_CONST( PE_FLATCONTOUR_BIAS, 20 ), lag ); |
| |
| /* Set up codebook parameters according to complexity setting and frame length */ |
| if( nb_subfr == PE_MAX_NB_SUBFR ) { |
| nb_cbk_search = (opus_int)silk_nb_cbk_searchs_stage3[ complexity ]; |
| cbk_size = PE_NB_CBKS_STAGE3_MAX; |
| Lag_CB_ptr = &silk_CB_lags_stage3[ 0 ][ 0 ]; |
| } else { |
| nb_cbk_search = PE_NB_CBKS_STAGE3_10MS; |
| cbk_size = PE_NB_CBKS_STAGE3_10MS; |
| Lag_CB_ptr = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ]; |
| } |
| for( d = start_lag; d <= end_lag; d++ ) { |
| for( j = 0; j < nb_cbk_search; j++ ) { |
| cross_corr = 0; |
| energy = 0; |
| for( k = 0; k < nb_subfr; k++ ) { |
| silk_assert( PE_MAX_NB_SUBFR == 4 ); |
| energy += silk_RSHIFT( energies_st3[ k ][ j ][ lag_counter ], 2 ); /* use mean, to avoid overflow */ |
| silk_assert( energy >= 0 ); |
| cross_corr += silk_RSHIFT( crosscorr_st3[ k ][ j ][ lag_counter ], 2 ); /* use mean, to avoid overflow */ |
| } |
| if( cross_corr > 0 ) { |
| /* Divide cross_corr / energy and get result in Q15 */ |
| lz = silk_CLZ32( cross_corr ); |
| /* Divide with result in Q13, cross_corr could be larger than energy */ |
| lshift = silk_LIMIT_32( lz - 1, 0, 13 ); |
| CCmax_new = silk_DIV32( silk_LSHIFT( cross_corr, lshift ), silk_RSHIFT( energy, 13 - lshift ) + 1 ); |
| CCmax_new = silk_SAT16( CCmax_new ); |
| CCmax_new = silk_SMULWB( cross_corr, CCmax_new ); |
| /* Saturate */ |
| if( CCmax_new > silk_RSHIFT( silk_int32_MAX, 3 ) ) { |
| CCmax_new = silk_int32_MAX; |
| } else { |
| CCmax_new = silk_LSHIFT( CCmax_new, 3 ); |
| } |
| /* Reduce depending on flatness of contour */ |
| diff = silk_int16_MAX - silk_RSHIFT( silk_MUL( contour_bias_Q20, j ), 5 ); /* Q20 -> Q15 */ |
| silk_assert( diff == silk_SAT16( diff ) ); |
| CCmax_new = silk_LSHIFT( silk_SMULWB( CCmax_new, diff ), 1 ); |
| } else { |
| CCmax_new = 0; |
| } |
| |
| if( CCmax_new > CCmax && |
| ( d + silk_CB_lags_stage3[ 0 ][ j ] ) <= max_lag |
| ) { |
| CCmax = CCmax_new; |
| lag_new = d; |
| CBimax = j; |
| } |
| } |
| lag_counter++; |
| } |
| |
| for( k = 0; k < nb_subfr; k++ ) { |
| pitch_out[ k ] = lag_new + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size ); |
| pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], min_lag, PE_MAX_LAG_MS * Fs_kHz ); |
| } |
| *lagIndex = (opus_int16)( lag_new - min_lag); |
| *contourIndex = (opus_int8)CBimax; |
| } else { /* Fs_kHz == 8 */ |
| /* Save Lags and correlation */ |
| CCmax = silk_max( CCmax, 0 ); |
| *LTPCorr_Q15 = (opus_int)silk_SQRT_APPROX( silk_LSHIFT( CCmax, 13 ) ); /* Output normalized correlation */ |
| for( k = 0; k < nb_subfr; k++ ) { |
| pitch_out[ k ] = lag + matrix_ptr( Lag_CB_ptr, k, CBimax, cbk_size ); |
| pitch_out[ k ] = silk_LIMIT( pitch_out[ k ], min_lag_8kHz, PE_MAX_LAG_MS * Fs_kHz ); |
| } |
| *lagIndex = (opus_int16)( lag - min_lag_8kHz ); |
| *contourIndex = (opus_int8)CBimax; |
| } |
| silk_assert( *lagIndex >= 0 ); |
| /* return as voiced */ |
| return 0; |
| } |
| |
| /*************************************************************************/ |
| /* Calculates the correlations used in stage 3 search. In order to cover */ |
| /* the whole lag codebook for all the searched offset lags (lag +- 2), */ |
| /*************************************************************************/ |
| void silk_P_Ana_calc_corr_st3( |
| opus_int32 cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ],/* (O) 3 DIM correlation array */ |
| const opus_int16 frame[], /* I vector to correlate */ |
| opus_int start_lag, /* I lag offset to search around */ |
| opus_int sf_length, /* I length of a 5 ms subframe */ |
| opus_int nb_subfr, /* I number of subframes */ |
| opus_int complexity /* I Complexity setting */ |
| ) |
| { |
| const opus_int16 *target_ptr, *basis_ptr; |
| opus_int32 cross_corr; |
| opus_int i, j, k, lag_counter, lag_low, lag_high; |
| opus_int nb_cbk_search, delta, idx, cbk_size; |
| opus_int32 scratch_mem[ SCRATCH_SIZE ]; |
| const opus_int8 *Lag_range_ptr, *Lag_CB_ptr; |
| |
| silk_assert( complexity >= SILK_PE_MIN_COMPLEX ); |
| silk_assert( complexity <= SILK_PE_MAX_COMPLEX ); |
| |
| if( nb_subfr == PE_MAX_NB_SUBFR ) { |
| Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ]; |
| Lag_CB_ptr = &silk_CB_lags_stage3[ 0 ][ 0 ]; |
| nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ]; |
| cbk_size = PE_NB_CBKS_STAGE3_MAX; |
| } else { |
| silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1); |
| Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ]; |
| Lag_CB_ptr = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ]; |
| nb_cbk_search = PE_NB_CBKS_STAGE3_10MS; |
| cbk_size = PE_NB_CBKS_STAGE3_10MS; |
| } |
| |
| target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ]; /* Pointer to middle of frame */ |
| for( k = 0; k < nb_subfr; k++ ) { |
| lag_counter = 0; |
| |
| /* Calculate the correlations for each subframe */ |
| lag_low = matrix_ptr( Lag_range_ptr, k, 0, 2 ); |
| lag_high = matrix_ptr( Lag_range_ptr, k, 1, 2 ); |
| for( j = lag_low; j <= lag_high; j++ ) { |
| basis_ptr = target_ptr - ( start_lag + j ); |
| cross_corr = silk_inner_prod_aligned( (opus_int16*)target_ptr, (opus_int16*)basis_ptr, sf_length ); |
| silk_assert( lag_counter < SCRATCH_SIZE ); |
| scratch_mem[ lag_counter ] = cross_corr; |
| lag_counter++; |
| } |
| |
| delta = matrix_ptr( Lag_range_ptr, k, 0, 2 ); |
| for( i = 0; i < nb_cbk_search; i++ ) { |
| /* Fill out the 3 dim array that stores the correlations for */ |
| /* each code_book vector for each start lag */ |
| idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta; |
| for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) { |
| silk_assert( idx + j < SCRATCH_SIZE ); |
| silk_assert( idx + j < lag_counter ); |
| cross_corr_st3[ k ][ i ][ j ] = scratch_mem[ idx + j ]; |
| } |
| } |
| target_ptr += sf_length; |
| } |
| } |
| |
| /********************************************************************/ |
| /* Calculate the energies for first two subframes. The energies are */ |
| /* calculated recursively. */ |
| /********************************************************************/ |
| void silk_P_Ana_calc_energy_st3( |
| opus_int32 energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ],/* (O) 3 DIM energy array */ |
| const opus_int16 frame[], /* I vector to calc energy in */ |
| opus_int start_lag, /* I lag offset to search around */ |
| opus_int sf_length, /* I length of one 5 ms subframe */ |
| opus_int nb_subfr, /* I number of subframes */ |
| opus_int complexity /* I Complexity setting */ |
| ) |
| { |
| const opus_int16 *target_ptr, *basis_ptr; |
| opus_int32 energy; |
| opus_int k, i, j, lag_counter; |
| opus_int nb_cbk_search, delta, idx, cbk_size, lag_diff; |
| opus_int32 scratch_mem[ SCRATCH_SIZE ]; |
| const opus_int8 *Lag_range_ptr, *Lag_CB_ptr; |
| |
| silk_assert( complexity >= SILK_PE_MIN_COMPLEX ); |
| silk_assert( complexity <= SILK_PE_MAX_COMPLEX ); |
| |
| if( nb_subfr == PE_MAX_NB_SUBFR ) { |
| Lag_range_ptr = &silk_Lag_range_stage3[ complexity ][ 0 ][ 0 ]; |
| Lag_CB_ptr = &silk_CB_lags_stage3[ 0 ][ 0 ]; |
| nb_cbk_search = silk_nb_cbk_searchs_stage3[ complexity ]; |
| cbk_size = PE_NB_CBKS_STAGE3_MAX; |
| } else { |
| silk_assert( nb_subfr == PE_MAX_NB_SUBFR >> 1); |
| Lag_range_ptr = &silk_Lag_range_stage3_10_ms[ 0 ][ 0 ]; |
| Lag_CB_ptr = &silk_CB_lags_stage3_10_ms[ 0 ][ 0 ]; |
| nb_cbk_search = PE_NB_CBKS_STAGE3_10MS; |
| cbk_size = PE_NB_CBKS_STAGE3_10MS; |
| } |
| target_ptr = &frame[ silk_LSHIFT( sf_length, 2 ) ]; |
| for( k = 0; k < nb_subfr; k++ ) { |
| lag_counter = 0; |
| |
| /* Calculate the energy for first lag */ |
| basis_ptr = target_ptr - ( start_lag + matrix_ptr( Lag_range_ptr, k, 0, 2 ) ); |
| energy = silk_inner_prod_aligned( basis_ptr, basis_ptr, sf_length ); |
| silk_assert( energy >= 0 ); |
| scratch_mem[ lag_counter ] = energy; |
| lag_counter++; |
| |
| lag_diff = ( matrix_ptr( Lag_range_ptr, k, 1, 2 ) - matrix_ptr( Lag_range_ptr, k, 0, 2 ) + 1 ); |
| for( i = 1; i < lag_diff; i++ ) { |
| /* remove part outside new window */ |
| energy -= silk_SMULBB( basis_ptr[ sf_length - i ], basis_ptr[ sf_length - i ] ); |
| silk_assert( energy >= 0 ); |
| |
| /* add part that comes into window */ |
| energy = silk_ADD_SAT32( energy, silk_SMULBB( basis_ptr[ -i ], basis_ptr[ -i ] ) ); |
| silk_assert( energy >= 0 ); |
| silk_assert( lag_counter < SCRATCH_SIZE ); |
| scratch_mem[ lag_counter ] = energy; |
| lag_counter++; |
| } |
| |
| delta = matrix_ptr( Lag_range_ptr, k, 0, 2 ); |
| for( i = 0; i < nb_cbk_search; i++ ) { |
| /* Fill out the 3 dim array that stores the correlations for */ |
| /* each code_book vector for each start lag */ |
| idx = matrix_ptr( Lag_CB_ptr, k, i, cbk_size ) - delta; |
| for( j = 0; j < PE_NB_STAGE3_LAGS; j++ ) { |
| silk_assert( idx + j < SCRATCH_SIZE ); |
| silk_assert( idx + j < lag_counter ); |
| energies_st3[ k ][ i ][ j ] = scratch_mem[ idx + j ]; |
| silk_assert( energies_st3[ k ][ i ][ j ] >= 0 ); |
| } |
| } |
| target_ptr += sf_length; |
| } |
| } |
| |
| opus_int32 silk_P_Ana_find_scaling( |
| const opus_int16 *frame, |
| const opus_int frame_length, |
| const opus_int sum_sqr_len |
| ) |
| { |
| opus_int32 nbits, x_max; |
| |
| x_max = silk_int16_array_maxabs( frame, frame_length ); |
| |
| if( x_max < silk_int16_MAX ) { |
| /* Number of bits needed for the sum of the squares */ |
| nbits = 32 - silk_CLZ32( silk_SMULBB( x_max, x_max ) ); |
| } else { |
| /* Here we don't know if x_max should have been silk_int16_MAX + 1, so we expect the worst case */ |
| nbits = 30; |
| } |
| nbits += 17 - silk_CLZ16( sum_sqr_len ); |
| |
| /* Without a guarantee of saturation, we need to keep the 31st bit free */ |
| if( nbits < 31 ) { |
| return 0; |
| } else { |
| return( nbits - 30 ); |
| } |
| } |
