diff options
| author | Koen Vos <koenvos74@gmail.com> | 2013-11-20 17:32:32 +0400 |
|---|---|---|
| committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2013-11-20 17:32:32 +0400 |
| commit | c63fb978be59fd09179abe9d714ee598d888e789 (patch) | |
| tree | 36deeaa6440ff80c943e19d6ab4016e29dd4ccbc /silk/quant_LTP_gains.c | |
| parent | ac31a0af4ace081404de39342eed41cf59f91e2d (diff) | |
Constrains accumulated pitch gain to avoid potential instability.
Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>
Diffstat (limited to 'silk/quant_LTP_gains.c')
| -rw-r--r-- | silk/quant_LTP_gains.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/silk/quant_LTP_gains.c b/silk/quant_LTP_gains.c index 43b43cb8..d974a5fc 100644 --- a/silk/quant_LTP_gains.c +++ b/silk/quant_LTP_gains.c @@ -30,11 +30,13 @@ POSSIBILITY OF SUCH DAMAGE. #endif #include "main.h" +#include "tuning_parameters.h" void silk_quant_LTP_gains( opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* I/O (un)quantized LTP gains */ opus_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */ opus_int8 *periodicity_index, /* O Periodicity Index */ + opus_int32 *sum_log_gain_Q7, /* I/O Cumulative max prediction gain */ const opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */ opus_int mu_Q9, /* I Mu value (R/D tradeoff) */ opus_int lowComplexity, /* I Flag for low complexity */ @@ -48,12 +50,14 @@ void silk_quant_LTP_gains( const opus_int16 *b_Q14_ptr; const opus_int32 *W_Q18_ptr; opus_int32 rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14; + opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7, gain_Q7; /***************************************************/ /* iterate over different codebooks with different */ /* rates/distortions, and choose best */ /***************************************************/ min_rate_dist_Q14 = silk_int32_MAX; + best_sum_log_gain_Q7 = 0; for( k = 0; k < 3; k++ ) { cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ]; cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ]; @@ -64,19 +68,26 @@ void silk_quant_LTP_gains( b_Q14_ptr = B_Q14; rate_dist_Q14 = 0; + sum_log_gain_tmp_Q7 = *sum_log_gain_Q7; for( j = 0; j < nb_subfr; j++ ) { + max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 ) + + SILK_FIX_CONST( 7, 7 ) ) - SILK_FIX_CONST( 0.5, 7 ); + silk_VQ_WMat_EC( &temp_idx[ j ], /* O index of best codebook vector */ &rate_dist_Q14_subfr, /* O best weighted quantization error + mu * rate */ + &gain_Q7, /* O sum of absolute LTP coefficients */ b_Q14_ptr, /* I input vector to be quantized */ W_Q18_ptr, /* I weighting matrix */ cbk_ptr_Q7, /* I codebook */ cl_ptr_Q5, /* I code length for each codebook vector */ mu_Q9, /* I tradeoff between weighted error and rate */ + max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ cbk_size /* I number of vectors in codebook */ ); rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr ); + sum_log_gain_tmp_Q7 += silk_lin2log( SILK_FIX_CONST( 0.5, 7 ) + gain_Q7 ) - SILK_FIX_CONST( 7, 7 ); b_Q14_ptr += LTP_ORDER; W_Q18_ptr += LTP_ORDER * LTP_ORDER; @@ -89,6 +100,7 @@ void silk_quant_LTP_gains( min_rate_dist_Q14 = rate_dist_Q14; *periodicity_index = (opus_int8)k; silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) ); + best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7; } /* Break early in low-complexity mode if rate distortion is below threshold */ @@ -103,5 +115,6 @@ void silk_quant_LTP_gains( B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 ); } } + *sum_log_gain_Q7 = best_sum_log_gain_Q7; } |