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Side by Side Diff: silk/LP_variable_cutoff.c

Issue 107243004: Updating Opus to release 1.1 (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/opus
Patch Set: Created 7 years ago
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1 /*********************************************************************** 1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without 3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions 4 modification, are permitted provided that the following conditions
5 are met: 5 are met:
6 - Redistributions of source code must retain the above copyright notice, 6 - Redistributions of source code must retain the above copyright notice,
7 this list of conditions and the following disclaimer. 7 this list of conditions and the following disclaimer.
8 - Redistributions in binary form must reproduce the above copyright 8 - Redistributions in binary form must reproduce the above copyright
9 notice, this list of conditions and the following disclaimer in the 9 notice, this list of conditions and the following disclaimer in the
10 documentation and/or other materials provided with the distribution. 10 documentation and/or other materials provided with the distribution.
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31 31
32 /* 32 /*
33 Elliptic/Cauer filters designed with 0.1 dB passband ripple, 33 Elliptic/Cauer filters designed with 0.1 dB passband ripple,
34 80 dB minimum stopband attenuation, and 34 80 dB minimum stopband attenuation, and
35 [0.95 : 0.15 : 0.35] normalized cut off frequencies. 35 [0.95 : 0.15 : 0.35] normalized cut off frequencies.
36 */ 36 */
37 37
38 #include "main.h" 38 #include "main.h"
39 39
40 /* Helper function, interpolates the filter taps */ 40 /* Helper function, interpolates the filter taps */
41 static inline void silk_LP_interpolate_filter_taps( 41 static OPUS_INLINE void silk_LP_interpolate_filter_taps(
42 opus_int32 B_Q28[ TRANSITION_NB ], 42 opus_int32 B_Q28[ TRANSITION_NB ],
43 opus_int32 A_Q28[ TRANSITION_NA ], 43 opus_int32 A_Q28[ TRANSITION_NA ],
44 const opus_int ind, 44 const opus_int ind,
45 const opus_int32 fac_Q16 45 const opus_int32 fac_Q16
46 ) 46 )
47 { 47 {
48 opus_int nb, na; 48 opus_int nb, na;
49 49
50 if( ind < TRANSITION_INT_NUM - 1 ) { 50 if( ind < TRANSITION_INT_NUM - 1 ) {
51 if( fac_Q16 > 0 ) { 51 if( fac_Q16 > 0 ) {
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126 silk_LP_interpolate_filter_taps( B_Q28, A_Q28, ind, fac_Q16 ); 126 silk_LP_interpolate_filter_taps( B_Q28, A_Q28, ind, fac_Q16 );
127 127
128 /* Update transition frame number for next frame */ 128 /* Update transition frame number for next frame */
129 psLP->transition_frame_no = silk_LIMIT( psLP->transition_frame_no + psLP ->mode, 0, TRANSITION_FRAMES ); 129 psLP->transition_frame_no = silk_LIMIT( psLP->transition_frame_no + psLP ->mode, 0, TRANSITION_FRAMES );
130 130
131 /* ARMA low-pass filtering */ 131 /* ARMA low-pass filtering */
132 silk_assert( TRANSITION_NB == 3 && TRANSITION_NA == 2 ); 132 silk_assert( TRANSITION_NB == 3 && TRANSITION_NA == 2 );
133 silk_biquad_alt( frame, B_Q28, A_Q28, psLP->In_LP_State, frame, frame_le ngth, 1); 133 silk_biquad_alt( frame, B_Q28, A_Q28, psLP->In_LP_State, frame, frame_le ngth, 1);
134 } 134 }
135 } 135 }
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