78 lines
3.8 KiB
C
78 lines
3.8 KiB
C
/***********************************************************************
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Copyright (c) 2006-2010, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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/*
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* File Name: SKP_Silk_pulses_to_bytes.c
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*/
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#include <stdlib.h>
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#include "SKP_Silk_main.h"
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/* nBytes = sum_over_shell_blocks( POLY_FIT_0 + POLY_FIT_1 * sum_abs_val + POLY_FIT_2 * sum_abs_val^2 ) */
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#define POLY_FIT_0_Q15 12520
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#define POLY_FIT_1_Q15 15862
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#define POLY_FIT_2_Q20 -9222 // ToDo better training with
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/* Predict number of bytes used to encode q */
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SKP_int SKP_Silk_pulses_to_bytes( /* O Return value, predicted number of bytes used to encode q */
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SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
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SKP_int q[] /* I Pulse signal */
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)
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{
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SKP_int i, j, iter, *q_ptr;
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SKP_int32 sum_abs_val, nBytes, acc_nBytes;
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/* Take the absolute value of the pulses */
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iter = psEncC->frame_length / SHELL_CODEC_FRAME_LENGTH;
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/* Calculate rate as a nonlinaer mapping of sum abs value of each Shell block */
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q_ptr = q;
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acc_nBytes = 0;
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for( j = 0; j < iter; j++ ) {
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sum_abs_val = 0;
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for(i = 0; i < SHELL_CODEC_FRAME_LENGTH; i+=4){
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sum_abs_val += SKP_abs( q_ptr[ i + 0 ] );
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sum_abs_val += SKP_abs( q_ptr[ i + 1 ] );
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sum_abs_val += SKP_abs( q_ptr[ i + 2 ] );
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sum_abs_val += SKP_abs( q_ptr[ i + 3 ] );
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}
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/* Calculate nBytes used for thi sshell frame */
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nBytes = SKP_SMULWB( SKP_SMULBB( sum_abs_val, sum_abs_val ), POLY_FIT_2_Q20 ); // Q4
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nBytes = SKP_LSHIFT_SAT32( nBytes, 11 ); // Q15
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nBytes += SKP_SMULBB( sum_abs_val, POLY_FIT_1_Q15 ); // Q15
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nBytes += POLY_FIT_0_Q15; // Q15
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acc_nBytes += nBytes;
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q_ptr += SHELL_CODEC_FRAME_LENGTH; /* update pointer */
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}
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acc_nBytes = SKP_RSHIFT_ROUND( acc_nBytes, 15 ); // Q0
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acc_nBytes = SKP_SAT16( acc_nBytes ); // just to be sure // Q0
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return(( SKP_int )acc_nBytes);
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}
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