diff options
Diffstat (limited to 'silk/float/SKP_Silk_LTP_scale_ctrl_FLP.c')
-rw-r--r-- | silk/float/SKP_Silk_LTP_scale_ctrl_FLP.c | 52 |
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;
+}
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