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/VQ_WMat_EC.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/VQ_WMat_EC.c')
| -rw-r--r-- | silk/VQ_WMat_EC.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/silk/VQ_WMat_EC.c b/silk/VQ_WMat_EC.c index c5c6f714..4b53c149 100644 --- a/silk/VQ_WMat_EC.c +++ b/silk/VQ_WMat_EC.c @@ -35,15 +35,17 @@ POSSIBILITY OF SUCH DAMAGE. void silk_VQ_WMat_EC( opus_int8 *ind, /* O index of best codebook vector */ opus_int32 *rate_dist_Q14, /* O best weighted quant error + mu * rate */ + opus_int *gain_Q7, /* O sum of absolute LTP coefficients */ const opus_int16 *in_Q14, /* I input vector to be quantized */ const opus_int32 *W_Q18, /* I weighting matrix */ const opus_int8 *cb_Q7, /* I codebook */ const opus_uint8 *cl_Q5, /* I code length for each codebook vector */ const opus_int mu_Q9, /* I tradeoff betw. weighted error and rate */ + const opus_int32 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ opus_int L /* I number of vectors in codebook */ ) { - opus_int k; + opus_int k, gain_tmp_Q7; const opus_int8 *cb_row_Q7; opus_int16 diff_Q14[ 5 ]; opus_int32 sum1_Q14, sum2_Q16; @@ -52,6 +54,12 @@ void silk_VQ_WMat_EC( *rate_dist_Q14 = silk_int32_MAX; cb_row_Q7 = cb_Q7; for( k = 0; k < L; k++ ) { + gain_tmp_Q7 = silk_abs( cb_row_Q7[ 0 ] ) + + silk_abs( cb_row_Q7[ 1 ] ) + + silk_abs( cb_row_Q7[ 2 ] ) + + silk_abs( cb_row_Q7[ 3 ] ) + + silk_abs( cb_row_Q7[ 4 ] ); + diff_Q14[ 0 ] = in_Q14[ 0 ] - silk_LSHIFT( cb_row_Q7[ 0 ], 7 ); diff_Q14[ 1 ] = in_Q14[ 1 ] - silk_LSHIFT( cb_row_Q7[ 1 ], 7 ); diff_Q14[ 2 ] = in_Q14[ 2 ] - silk_LSHIFT( cb_row_Q7[ 2 ], 7 ); @@ -61,6 +69,9 @@ void silk_VQ_WMat_EC( /* Weighted rate */ sum1_Q14 = silk_SMULBB( mu_Q9, cl_Q5[ k ] ); + /* Penalty for too large gain */ + sum1_Q14 = silk_ADD_LSHIFT32( sum1_Q14, silk_max( silk_SUB32( gain_tmp_Q7, max_gain_Q7 ), 0 ), 10 ); + silk_assert( sum1_Q14 >= 0 ); /* first row of W_Q18 */ @@ -103,6 +114,7 @@ void silk_VQ_WMat_EC( if( sum1_Q14 < *rate_dist_Q14 ) { *rate_dist_Q14 = sum1_Q14; *ind = (opus_int8)k; + *gain_Q7 = gain_tmp_Q7; } /* Go to next cbk vector */ |