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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/biquad_alt.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/biquad_alt.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/biquad_alt.c b/lib/rbcodec/codecs/libopus/silk/biquad_alt.c new file mode 100644 index 0000000000..54566a43c0 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/biquad_alt.c | |||
@@ -0,0 +1,121 @@ | |||
1 | /*********************************************************************** | ||
2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. | ||
3 | Redistribution and use in source and binary forms, with or without | ||
4 | modification, are permitted provided that the following conditions | ||
5 | are met: | ||
6 | - Redistributions of source code must retain the above copyright notice, | ||
7 | this list of conditions and the following disclaimer. | ||
8 | - Redistributions in binary form must reproduce the above copyright | ||
9 | notice, this list of conditions and the following disclaimer in the | ||
10 | documentation and/or other materials provided with the distribution. | ||
11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the | ||
12 | names of specific contributors, may be used to endorse or promote | ||
13 | products derived from this software without specific prior written | ||
14 | permission. | ||
15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | ||
19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
25 | POSSIBILITY OF SUCH DAMAGE. | ||
26 | ***********************************************************************/ | ||
27 | |||
28 | /* * | ||
29 | * silk_biquad_alt.c * | ||
30 | * * | ||
31 | * Second order ARMA filter * | ||
32 | * Can handle slowly varying filter coefficients * | ||
33 | * */ | ||
34 | |||
35 | #ifdef HAVE_CONFIG_H | ||
36 | #include "config.h" | ||
37 | #endif | ||
38 | |||
39 | #include "SigProc_FIX.h" | ||
40 | |||
41 | /* Second order ARMA filter, alternative implementation */ | ||
42 | void silk_biquad_alt_stride1( | ||
43 | const opus_int16 *in, /* I input signal */ | ||
44 | const opus_int32 *B_Q28, /* I MA coefficients [3] */ | ||
45 | const opus_int32 *A_Q28, /* I AR coefficients [2] */ | ||
46 | opus_int32 *S, /* I/O State vector [2] */ | ||
47 | opus_int16 *out, /* O output signal */ | ||
48 | const opus_int32 len /* I signal length (must be even) */ | ||
49 | ) | ||
50 | { | ||
51 | /* DIRECT FORM II TRANSPOSED (uses 2 element state vector) */ | ||
52 | opus_int k; | ||
53 | opus_int32 inval, A0_U_Q28, A0_L_Q28, A1_U_Q28, A1_L_Q28, out32_Q14; | ||
54 | |||
55 | /* Negate A_Q28 values and split in two parts */ | ||
56 | A0_L_Q28 = ( -A_Q28[ 0 ] ) & 0x00003FFF; /* lower part */ | ||
57 | A0_U_Q28 = silk_RSHIFT( -A_Q28[ 0 ], 14 ); /* upper part */ | ||
58 | A1_L_Q28 = ( -A_Q28[ 1 ] ) & 0x00003FFF; /* lower part */ | ||
59 | A1_U_Q28 = silk_RSHIFT( -A_Q28[ 1 ], 14 ); /* upper part */ | ||
60 | |||
61 | for( k = 0; k < len; k++ ) { | ||
62 | /* S[ 0 ], S[ 1 ]: Q12 */ | ||
63 | inval = in[ k ]; | ||
64 | out32_Q14 = silk_LSHIFT( silk_SMLAWB( S[ 0 ], B_Q28[ 0 ], inval ), 2 ); | ||
65 | |||
66 | S[ 0 ] = S[1] + silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A0_L_Q28 ), 14 ); | ||
67 | S[ 0 ] = silk_SMLAWB( S[ 0 ], out32_Q14, A0_U_Q28 ); | ||
68 | S[ 0 ] = silk_SMLAWB( S[ 0 ], B_Q28[ 1 ], inval); | ||
69 | |||
70 | S[ 1 ] = silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14, A1_L_Q28 ), 14 ); | ||
71 | S[ 1 ] = silk_SMLAWB( S[ 1 ], out32_Q14, A1_U_Q28 ); | ||
72 | S[ 1 ] = silk_SMLAWB( S[ 1 ], B_Q28[ 2 ], inval ); | ||
73 | |||
74 | /* Scale back to Q0 and saturate */ | ||
75 | out[ k ] = (opus_int16)silk_SAT16( silk_RSHIFT( out32_Q14 + (1<<14) - 1, 14 ) ); | ||
76 | } | ||
77 | } | ||
78 | |||
79 | void silk_biquad_alt_stride2_c( | ||
80 | const opus_int16 *in, /* I input signal */ | ||
81 | const opus_int32 *B_Q28, /* I MA coefficients [3] */ | ||
82 | const opus_int32 *A_Q28, /* I AR coefficients [2] */ | ||
83 | opus_int32 *S, /* I/O State vector [4] */ | ||
84 | opus_int16 *out, /* O output signal */ | ||
85 | const opus_int32 len /* I signal length (must be even) */ | ||
86 | ) | ||
87 | { | ||
88 | /* DIRECT FORM II TRANSPOSED (uses 2 element state vector) */ | ||
89 | opus_int k; | ||
90 | opus_int32 A0_U_Q28, A0_L_Q28, A1_U_Q28, A1_L_Q28, out32_Q14[ 2 ]; | ||
91 | |||
92 | /* Negate A_Q28 values and split in two parts */ | ||
93 | A0_L_Q28 = ( -A_Q28[ 0 ] ) & 0x00003FFF; /* lower part */ | ||
94 | A0_U_Q28 = silk_RSHIFT( -A_Q28[ 0 ], 14 ); /* upper part */ | ||
95 | A1_L_Q28 = ( -A_Q28[ 1 ] ) & 0x00003FFF; /* lower part */ | ||
96 | A1_U_Q28 = silk_RSHIFT( -A_Q28[ 1 ], 14 ); /* upper part */ | ||
97 | |||
98 | for( k = 0; k < len; k++ ) { | ||
99 | /* S[ 0 ], S[ 1 ], S[ 2 ], S[ 3 ]: Q12 */ | ||
100 | out32_Q14[ 0 ] = silk_LSHIFT( silk_SMLAWB( S[ 0 ], B_Q28[ 0 ], in[ 2 * k + 0 ] ), 2 ); | ||
101 | out32_Q14[ 1 ] = silk_LSHIFT( silk_SMLAWB( S[ 2 ], B_Q28[ 0 ], in[ 2 * k + 1 ] ), 2 ); | ||
102 | |||
103 | S[ 0 ] = S[ 1 ] + silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14[ 0 ], A0_L_Q28 ), 14 ); | ||
104 | S[ 2 ] = S[ 3 ] + silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14[ 1 ], A0_L_Q28 ), 14 ); | ||
105 | S[ 0 ] = silk_SMLAWB( S[ 0 ], out32_Q14[ 0 ], A0_U_Q28 ); | ||
106 | S[ 2 ] = silk_SMLAWB( S[ 2 ], out32_Q14[ 1 ], A0_U_Q28 ); | ||
107 | S[ 0 ] = silk_SMLAWB( S[ 0 ], B_Q28[ 1 ], in[ 2 * k + 0 ] ); | ||
108 | S[ 2 ] = silk_SMLAWB( S[ 2 ], B_Q28[ 1 ], in[ 2 * k + 1 ] ); | ||
109 | |||
110 | S[ 1 ] = silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14[ 0 ], A1_L_Q28 ), 14 ); | ||
111 | S[ 3 ] = silk_RSHIFT_ROUND( silk_SMULWB( out32_Q14[ 1 ], A1_L_Q28 ), 14 ); | ||
112 | S[ 1 ] = silk_SMLAWB( S[ 1 ], out32_Q14[ 0 ], A1_U_Q28 ); | ||
113 | S[ 3 ] = silk_SMLAWB( S[ 3 ], out32_Q14[ 1 ], A1_U_Q28 ); | ||
114 | S[ 1 ] = silk_SMLAWB( S[ 1 ], B_Q28[ 2 ], in[ 2 * k + 0 ] ); | ||
115 | S[ 3 ] = silk_SMLAWB( S[ 3 ], B_Q28[ 2 ], in[ 2 * k + 1 ] ); | ||
116 | |||
117 | /* Scale back to Q0 and saturate */ | ||
118 | out[ 2 * k + 0 ] = (opus_int16)silk_SAT16( silk_RSHIFT( out32_Q14[ 0 ] + (1<<14) - 1, 14 ) ); | ||
119 | out[ 2 * k + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT( out32_Q14[ 1 ] + (1<<14) - 1, 14 ) ); | ||
120 | } | ||
121 | } | ||