/src/opus/silk/HP_variable_cutoff.c
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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 | | #ifdef HAVE_CONFIG_H |
29 | | #include "config.h" |
30 | | #endif |
31 | | #ifdef FIXED_POINT |
32 | | #include "main_FIX.h" |
33 | | #else |
34 | | #include "main_FLP.h" |
35 | | #endif |
36 | | #include "tuning_parameters.h" |
37 | | |
38 | | /* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */ |
39 | | void silk_HP_variable_cutoff( |
40 | | silk_encoder_state_Fxx state_Fxx[] /* I/O Encoder states */ |
41 | | ) |
42 | 0 | { |
43 | 0 | opus_int quality_Q15; |
44 | 0 | opus_int32 pitch_freq_Hz_Q16, pitch_freq_log_Q7, delta_freq_Q7; |
45 | 0 | silk_encoder_state *psEncC1 = &state_Fxx[ 0 ].sCmn; |
46 | | |
47 | | /* Adaptive cutoff frequency: estimate low end of pitch frequency range */ |
48 | 0 | if( psEncC1->prevSignalType == TYPE_VOICED ) { |
49 | | /* difference, in log domain */ |
50 | 0 | pitch_freq_Hz_Q16 = silk_DIV32_16( silk_LSHIFT( silk_MUL( psEncC1->fs_kHz, 1000 ), 16 ), psEncC1->prevLag ); |
51 | 0 | pitch_freq_log_Q7 = silk_lin2log( pitch_freq_Hz_Q16 ) - ( 16 << 7 ); |
52 | | |
53 | | /* adjustment based on quality */ |
54 | 0 | quality_Q15 = psEncC1->input_quality_bands_Q15[ 0 ]; |
55 | 0 | pitch_freq_log_Q7 = silk_SMLAWB( pitch_freq_log_Q7, silk_SMULWB( silk_LSHIFT( -quality_Q15, 2 ), quality_Q15 ), |
56 | 0 | pitch_freq_log_Q7 - ( silk_lin2log( SILK_FIX_CONST( VARIABLE_HP_MIN_CUTOFF_HZ, 16 ) ) - ( 16 << 7 ) ) ); |
57 | | |
58 | | /* delta_freq = pitch_freq_log - psEnc->variable_HP_smth1; */ |
59 | 0 | delta_freq_Q7 = pitch_freq_log_Q7 - silk_RSHIFT( psEncC1->variable_HP_smth1_Q15, 8 ); |
60 | 0 | if( delta_freq_Q7 < 0 ) { |
61 | | /* less smoothing for decreasing pitch frequency, to track something close to the minimum */ |
62 | 0 | delta_freq_Q7 = silk_MUL( delta_freq_Q7, 3 ); |
63 | 0 | } |
64 | | |
65 | | /* limit delta, to reduce impact of outliers in pitch estimation */ |
66 | 0 | delta_freq_Q7 = silk_LIMIT_32( delta_freq_Q7, -SILK_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ), SILK_FIX_CONST( VARIABLE_HP_MAX_DELTA_FREQ, 7 ) ); |
67 | | |
68 | | /* update smoother */ |
69 | 0 | psEncC1->variable_HP_smth1_Q15 = silk_SMLAWB( psEncC1->variable_HP_smth1_Q15, |
70 | 0 | silk_SMULBB( psEncC1->speech_activity_Q8, delta_freq_Q7 ), SILK_FIX_CONST( VARIABLE_HP_SMTH_COEF1, 16 ) ); |
71 | | |
72 | | /* limit frequency range */ |
73 | 0 | psEncC1->variable_HP_smth1_Q15 = silk_LIMIT_32( psEncC1->variable_HP_smth1_Q15, |
74 | 0 | silk_LSHIFT( silk_lin2log( VARIABLE_HP_MIN_CUTOFF_HZ ), 8 ), |
75 | 0 | silk_LSHIFT( silk_lin2log( VARIABLE_HP_MAX_CUTOFF_HZ ), 8 ) ); |
76 | 0 | } |
77 | 0 | } |