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75 lines
3.8 KiB
C
75 lines
3.8 KiB
C
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/***********************************************************************
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Copyright (c) 2006-2011, 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "SigProc_FIX.h"
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/* Coefficients for 2-band filter bank based on first-order allpass filters */
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static opus_int16 A_fb1_20 = 5394 << 1;
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static opus_int16 A_fb1_21 = -24290; /* (opus_int16)(20623 << 1) */
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/* Split signal into two decimated bands using first-order allpass filters */
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void silk_ana_filt_bank_1(
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const opus_int16 *in, /* I Input signal [N] */
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opus_int32 *S, /* I/O State vector [2] */
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opus_int16 *outL, /* O Low band [N/2] */
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opus_int16 *outH, /* O High band [N/2] */
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const opus_int32 N /* I Number of input samples */
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)
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{
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opus_int k, N2 = silk_RSHIFT( N, 1 );
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opus_int32 in32, X, Y, out_1, out_2;
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/* Internal variables and state are in Q10 format */
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for( k = 0; k < N2; k++ ) {
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/* Convert to Q10 */
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in32 = silk_LSHIFT( (opus_int32)in[ 2 * k ], 10 );
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/* All-pass section for even input sample */
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Y = silk_SUB32( in32, S[ 0 ] );
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X = silk_SMLAWB( Y, Y, A_fb1_21 );
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out_1 = silk_ADD32( S[ 0 ], X );
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S[ 0 ] = silk_ADD32( in32, X );
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/* Convert to Q10 */
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in32 = silk_LSHIFT( (opus_int32)in[ 2 * k + 1 ], 10 );
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/* All-pass section for odd input sample, and add to output of previous section */
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Y = silk_SUB32( in32, S[ 1 ] );
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X = silk_SMULWB( Y, A_fb1_20 );
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out_2 = silk_ADD32( S[ 1 ], X );
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S[ 1 ] = silk_ADD32( in32, X );
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/* Add/subtract, convert back to int16 and store to output */
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outL[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_ADD32( out_2, out_1 ), 11 ) );
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outH[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SUB32( out_2, out_1 ), 11 ) );
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}
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}
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