From 4f5557c3095a1d212161609ff638cdae67a9b303 Mon Sep 17 00:00:00 2001
From: Felicia Lim <flim@google.com>
Date: Wed, 30 Mar 2016 15:46:59 +0200
Subject: [PATCH] Attenuate SILK PLC gain only for unvoiced speech
---
silk/PLC.c | 6 ++++--
silk/decode_frame.c | 1 +
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/silk/PLC.c b/silk/PLC.c
index fb6ea887b..277037a94 100644
--- a/silk/PLC.c
+++ b/silk/PLC.c
@@ -328,8 +328,10 @@ static OPUS_INLINE void silk_PLC_conceal(
for( j = 0; j < LTP_ORDER; j++ ) {
B_Q14[ j ] = silk_RSHIFT( silk_SMULBB( harm_Gain_Q15, B_Q14[ j ] ), 15 );
}
- /* Gradually reduce excitation gain */
- rand_scale_Q14 = silk_RSHIFT( silk_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 );
+ if ( psDec->indices.signalType != TYPE_NO_VOICE_ACTIVITY ) {
+ /* Gradually reduce excitation gain */
+ rand_scale_Q14 = silk_RSHIFT( silk_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 );
+ }
/* Slowly increase pitch lag */
psPLC->pitchL_Q8 = silk_SMLAWB( psPLC->pitchL_Q8, psPLC->pitchL_Q8, PITCH_DRIFT_FAC_Q16 );
diff --git a/silk/decode_frame.c b/silk/decode_frame.c
index a605d95ac..dfa73c4a2 100644
--- a/silk/decode_frame.c
+++ b/silk/decode_frame.c
@@ -97,6 +97,7 @@ opus_int silk_decode_frame(
psDec->first_frame_after_reset = 0;
} else {
/* Handle packet loss by extrapolation */
+ psDec->indices.signalType = psDec->prevSignalType;
silk_PLC( psDec, psDecCtrl, pOut, 1, arch );
}
--
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