[Opus] Update to v1.2.1

third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c

Index: third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c
diff --git a/third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c b/third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c
index d308e9cf5fe609e17b06b4d1339193134cccf3f8..24c6aab3a77c95e1c90466e3cfb131e52b81e104 100644
--- a/third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c
+++ b/third_party/opus/src/silk/fixed/find_pred_coefs_FIX.c
@@ -41,13 +41,12 @@ void silk_find_pred_coefs_FIX(
 )
 {
     opus_int         i;
-    opus_int32       invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ];
+    opus_int32       invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ];
     opus_int16       NLSF_Q15[ MAX_LPC_ORDER ];
     const opus_int16 *x_ptr;
     opus_int16       *x_pre_ptr;
     VARDECL( opus_int16, LPC_in_pre );
-    opus_int32       tmp, min_gain_Q16, minInvGain_Q30;
-    opus_int         LTP_corrs_rshift[ MAX_NB_SUBFR ];
+    opus_int32       min_gain_Q16, minInvGain_Q30;
     SAVE_STACK;
 
     /* weighting for weighted least squares */
@@ -61,13 +60,11 @@ void silk_find_pred_coefs_FIX(
         /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */
         invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 );
 
-        /* Ensure Wght_Q15 a minimum value 1 */
-        invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 );
+        /* Limit inverse */
+        invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 100 );
 
         /* Square the inverted gains */
         silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) );
-        tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] );
-        Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 );
 
         /* Invert the inverted and normalized gains */
         local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] );
@@ -77,24 +74,24 @@ void silk_find_pred_coefs_FIX(
            psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder
                + psEnc->sCmn.frame_length, opus_int16 );
     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
-        VARDECL( opus_int32, WLTP );
+        VARDECL( opus_int32, xXLTP_Q17 );
+        VARDECL( opus_int32, XXLTP_Q17 );
 
         /**********/
         /* VOICED */
         /**********/
         silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
 
-        ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 );
+        ALLOC( xXLTP_Q17, psEnc->sCmn.nb_subfr * LTP_ORDER, opus_int32 );
+        ALLOC( XXLTP_Q17, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 );
 
         /* LTP analysis */
-        silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7,
-            res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length,
-            psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift, psEnc->sCmn.arch );
+        silk_find_LTP_FIX( XXLTP_Q17, xXLTP_Q17, res_pitch,
+            psEncCtrl->pitchL, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch );
 
         /* Quantize LTP gain parameters */
         silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
-            &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr,
-            psEnc->sCmn.arch);
+            &psEnc->sCmn.sum_log_gain_Q7, &psEncCtrl->LTPredCodGain_Q7, XXLTP_Q17, xXLTP_Q17, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch );
 
         /* Control LTP scaling */
         silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding );