diff options
Diffstat (limited to 'src/opus-1.0.2/silk/biquad_alt.c')
| -rw-r--r-- | src/opus-1.0.2/silk/biquad_alt.c | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/src/opus-1.0.2/silk/biquad_alt.c b/src/opus-1.0.2/silk/biquad_alt.c deleted file mode 100644 index a639e21a..00000000 --- a/src/opus-1.0.2/silk/biquad_alt.c +++ /dev/null @@ -1,78 +0,0 @@ -/*********************************************************************** -Copyright (c) 2006-2011, Skype Limited. All rights reserved. -Redistribution and use in source and binary forms, with or without -modification, 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 Internet Society, IETF or IETF Trust, nor the -names of specific contributors, may be used to endorse or promote -products derived from this software without specific prior written -permission. -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. -***********************************************************************/ - -/* * - * silk_biquad_alt.c * - * * - * Second order ARMA filter * - * Can handle slowly varying filter coefficients * - * */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "SigProc_FIX.h" - -/* Second order ARMA filter, alternative implementation */ -void silk_biquad_alt( - const opus_int16 *in, /* I input signal */ - const opus_int32 *B_Q28, /* I MA coefficients [3] */ - const opus_int32 *A_Q28, /* I AR coefficients [2] */ - opus_int32 *S, /* I/O State vector [2] */ - opus_int16 *out, /* O output signal */ - const opus_int32 len, /* I signal length (must be even) */ - opus_int stride /* I Operate on interleaved signal if > 1 */ -) -{ - /* DIRECT FORM II TRANSPOSED (uses 2 element state vector) */ - opus_int k; - opus_int32 inval, A0_U_Q28, A0_L_Q28, A1_U_Q28, A1_L_Q28, out32_Q14; - - /* Negate A_Q28 values and split in two parts */ - A0_L_Q28 = ( -A_Q28[ 0 ] ) & 0x00003FFF; /* lower part */ - A0_U_Q28 = silk_RSHIFT( -A_Q28[ 0 ], 14 ); /* upper part */ - A1_L_Q28 = ( -A_Q28[ 1 ] ) & 0x00003FFF; /* lower part */ - A1_U_Q28 = silk_RSHIFT( -A_Q28[ 1 ], 14 ); /* upper part */ - - for( k = 0; k < len; k++ ) { - /* S[ 0 ], S[ 1 ]: Q12 */ - inval = in[ k * stride ]; - out32_Q14 = silk_LSHIFT( silk_SMLAWB( S[ 0 ], B_Q28[ 0 ], inval ), 2 ); - - S[ 0 ] = S[1] + silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A0_L_Q28 ), 14 ); - S[ 0 ] = silk_SMLAWB( S[ 0 ], out32_Q14, A0_U_Q28 ); - S[ 0 ] = silk_SMLAWB( S[ 0 ], B_Q28[ 1 ], inval); - - S[ 1 ] = silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A1_L_Q28 ), 14 ); - S[ 1 ] = silk_SMLAWB( S[ 1 ], out32_Q14, A1_U_Q28 ); - S[ 1 ] = silk_SMLAWB( S[ 1 ], B_Q28[ 2 ], inval ); - - /* Scale back to Q0 and saturate */ - out[ k * stride ] = (opus_int16)silk_SAT16( silk_RSHIFT( out32_Q14 + (1<<14) - 1, 14 ) ); - } -} |