diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/float/find_pitch_lags_FLP.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/float/find_pitch_lags_FLP.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/float/find_pitch_lags_FLP.c b/lib/rbcodec/codecs/libopus/silk/float/find_pitch_lags_FLP.c new file mode 100644 index 0000000000..dedbcd2836 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/float/find_pitch_lags_FLP.c | |||
@@ -0,0 +1,132 @@ | |||
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 | |||
32 | #include <stdlib.h> | ||
33 | #include "main_FLP.h" | ||
34 | #include "tuning_parameters.h" | ||
35 | |||
36 | void silk_find_pitch_lags_FLP( | ||
37 | silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ | ||
38 | silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ | ||
39 | silk_float res[], /* O Residual */ | ||
40 | const silk_float x[], /* I Speech signal */ | ||
41 | int arch /* I Run-time architecture */ | ||
42 | ) | ||
43 | { | ||
44 | opus_int buf_len; | ||
45 | silk_float thrhld, res_nrg; | ||
46 | const silk_float *x_buf_ptr, *x_buf; | ||
47 | silk_float auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ]; | ||
48 | silk_float A[ MAX_FIND_PITCH_LPC_ORDER ]; | ||
49 | silk_float refl_coef[ MAX_FIND_PITCH_LPC_ORDER ]; | ||
50 | silk_float Wsig[ FIND_PITCH_LPC_WIN_MAX ]; | ||
51 | silk_float *Wsig_ptr; | ||
52 | |||
53 | /******************************************/ | ||
54 | /* Set up buffer lengths etc based on Fs */ | ||
55 | /******************************************/ | ||
56 | buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length; | ||
57 | |||
58 | /* Safety check */ | ||
59 | celt_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length ); | ||
60 | |||
61 | x_buf = x - psEnc->sCmn.ltp_mem_length; | ||
62 | |||
63 | /******************************************/ | ||
64 | /* Estimate LPC AR coeficients */ | ||
65 | /******************************************/ | ||
66 | |||
67 | /* Calculate windowed signal */ | ||
68 | |||
69 | /* First LA_LTP samples */ | ||
70 | x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length; | ||
71 | Wsig_ptr = Wsig; | ||
72 | silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch ); | ||
73 | |||
74 | /* Middle non-windowed samples */ | ||
75 | Wsig_ptr += psEnc->sCmn.la_pitch; | ||
76 | x_buf_ptr += psEnc->sCmn.la_pitch; | ||
77 | silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ) ) * sizeof( silk_float ) ); | ||
78 | |||
79 | /* Last LA_LTP samples */ | ||
80 | Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); | ||
81 | x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - ( psEnc->sCmn.la_pitch << 1 ); | ||
82 | silk_apply_sine_window_FLP( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch ); | ||
83 | |||
84 | /* Calculate autocorrelation sequence */ | ||
85 | silk_autocorrelation_FLP( auto_corr, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 ); | ||
86 | |||
87 | /* Add white noise, as a fraction of the energy */ | ||
88 | auto_corr[ 0 ] += auto_corr[ 0 ] * FIND_PITCH_WHITE_NOISE_FRACTION + 1; | ||
89 | |||
90 | /* Calculate the reflection coefficients using Schur */ | ||
91 | res_nrg = silk_schur_FLP( refl_coef, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder ); | ||
92 | |||
93 | /* Prediction gain */ | ||
94 | psEncCtrl->predGain = auto_corr[ 0 ] / silk_max_float( res_nrg, 1.0f ); | ||
95 | |||
96 | /* Convert reflection coefficients to prediction coefficients */ | ||
97 | silk_k2a_FLP( A, refl_coef, psEnc->sCmn.pitchEstimationLPCOrder ); | ||
98 | |||
99 | /* Bandwidth expansion */ | ||
100 | silk_bwexpander_FLP( A, psEnc->sCmn.pitchEstimationLPCOrder, FIND_PITCH_BANDWIDTH_EXPANSION ); | ||
101 | |||
102 | /*****************************************/ | ||
103 | /* LPC analysis filtering */ | ||
104 | /*****************************************/ | ||
105 | silk_LPC_analysis_filter_FLP( res, A, x_buf, buf_len, psEnc->sCmn.pitchEstimationLPCOrder ); | ||
106 | |||
107 | if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) { | ||
108 | /* Threshold for pitch estimator */ | ||
109 | thrhld = 0.6f; | ||
110 | thrhld -= 0.004f * psEnc->sCmn.pitchEstimationLPCOrder; | ||
111 | thrhld -= 0.1f * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ); | ||
112 | thrhld -= 0.15f * (psEnc->sCmn.prevSignalType >> 1); | ||
113 | thrhld -= 0.1f * psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ); | ||
114 | |||
115 | /*****************************************/ | ||
116 | /* Call Pitch estimator */ | ||
117 | /*****************************************/ | ||
118 | if( silk_pitch_analysis_core_FLP( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, | ||
119 | &psEnc->sCmn.indices.contourIndex, &psEnc->LTPCorr, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16 / 65536.0f, | ||
120 | thrhld, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr, arch ) == 0 ) | ||
121 | { | ||
122 | psEnc->sCmn.indices.signalType = TYPE_VOICED; | ||
123 | } else { | ||
124 | psEnc->sCmn.indices.signalType = TYPE_UNVOICED; | ||
125 | } | ||
126 | } else { | ||
127 | silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) ); | ||
128 | psEnc->sCmn.indices.lagIndex = 0; | ||
129 | psEnc->sCmn.indices.contourIndex = 0; | ||
130 | psEnc->LTPCorr = 0; | ||
131 | } | ||
132 | } | ||