995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
74 lines
3.7 KiB
C
74 lines
3.7 KiB
C
/***********************************************************************
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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, are permitted provided that the following conditions
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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 Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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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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