1 files changed, 52 insertions, 0 deletions
diff --git a/silk/float/SKP_Silk_LTP_scale_ctrl_FLP.c b/silk/float/SKP_Silk_LTP_scale_ctrl_FLP.c
new file mode 100644
index 00000000..4d9345d9
--- /dev/null
+++ b/silk/float/SKP_Silk_LTP_scale_ctrl_FLP.c
@@ -0,0 +1,52 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved. 
+Redistribution and use in source and binary forms, with or without 
+modification, (subject to the limitations in the disclaimer below) 
+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 Skype Limited, nor the names of specific 
+contributors, may be used to endorse or promote products derived from 
+this software without specific prior written permission.
+NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED 
+BY THIS LICENSE. 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.
+***********************************************************************/
+
+#include "SKP_Silk_main_FLP.h"
+
+void SKP_Silk_LTP_scale_ctrl_FLP(
+    SKP_Silk_encoder_state_FLP      *psEnc,             /* I/O  Encoder state FLP                       */
+    SKP_Silk_encoder_control_FLP    *psEncCtrl          /* I/O  Encoder control FLP                     */
+)
+{
+    SKP_int   round_loss;
+
+    /* 1st order high-pass filter */
+    //g_HP(n) = g(n) - 0.5 * g(n-1) + 0.5 * g_HP(n-1);
+    psEnc->HPLTPredCodGain = SKP_max_float( psEncCtrl->LTPredCodGain - 0.5 * psEnc->prevLTPredCodGain, 0.0f ) 
+                            + 0.5f * psEnc->HPLTPredCodGain;
+    psEnc->prevLTPredCodGain = psEncCtrl->LTPredCodGain;
+
+    /* Only scale if first frame in packet */
+    if( psEnc->sCmn.nFramesAnalyzed == 0 ) {
+        round_loss = psEnc->sCmn.PacketLoss_perc + psEnc->sCmn.nFramesPerPacket;
+        psEnc->sCmn.indices.LTP_scaleIndex = (SKP_int8)SKP_LIMIT( round_loss * psEnc->HPLTPredCodGain * 0.1f, 0.0f, 2.0f );
+    } else {
+        /* Default is minimum scaling */
+        psEnc->sCmn.indices.LTP_scaleIndex = 0;
+    }
+    psEncCtrl->LTP_scale = (SKP_float)SKP_Silk_LTPScales_table_Q14[ psEnc->sCmn.indices.LTP_scaleIndex ] / 16384.0f;
+}