75 lines
3.9 KiB
C
75 lines
3.9 KiB
C
/***********************************************************************
|
|
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.
|
|
***********************************************************************/
|
|
#include "opus/opus_config.h"
|
|
#ifdef OPUS_FIXED_POINT
|
|
#include "opus/silk/fixed/main_FIX.h"
|
|
#else
|
|
#include "opus/silk/float/main_FLP.h"
|
|
#endif
|
|
#include "opus/silk/tuning_parameters.h"
|
|
|
|
/* High-pass filter with cutoff frequency adaptation based on pitch lag statistics */
|
|
void silk_HP_variable_cutoff(
|
|
silk_encoder_state_Fxx state_Fxx[] /* I/O Encoder states */
|
|
)
|
|
{
|
|
opus_int quality_Q15;
|
|
opus_int32 pitch_freq_Hz_Q16, pitch_freq_log_Q7, delta_freq_Q7;
|
|
silk_encoder_state *psEncC1 = &state_Fxx[ 0 ].sCmn;
|
|
|
|
/* Adaptive cutoff frequency: estimate low end of pitch frequency range */
|
|
if( psEncC1->prevSignalType == TYPE_VOICED ) {
|
|
/* difference, in log domain */
|
|
pitch_freq_Hz_Q16 = silk_DIV32_16( silk_LSHIFT( silk_MUL( psEncC1->fs_kHz, 1000 ), 16 ), psEncC1->prevLag );
|
|
pitch_freq_log_Q7 = silk_lin2log( pitch_freq_Hz_Q16 ) - ( 16 << 7 );
|
|
|
|
/* adjustment based on quality */
|
|
quality_Q15 = psEncC1->input_quality_bands_Q15[ 0 ];
|
|
pitch_freq_log_Q7 = silk_SMLAWB( pitch_freq_log_Q7, silk_SMULWB( silk_LSHIFT( -quality_Q15, 2 ), quality_Q15 ),
|
|
pitch_freq_log_Q7 - ( silk_lin2log( SILK_FIX_CONST( VARIABLE_HP_MIN_CUTOFF_HZ, 16 ) ) - ( 16 << 7 ) ) );
|
|
|
|
/* delta_freq = pitch_freq_log - psEnc->variable_HP_smth1; */
|
|
delta_freq_Q7 = pitch_freq_log_Q7 - silk_RSHIFT( psEncC1->variable_HP_smth1_Q15, 8 );
|
|
if( delta_freq_Q7 < 0 ) {
|
|
/* less smoothing for decreasing pitch frequency, to track something close to the minimum */
|
|
delta_freq_Q7 = silk_MUL( delta_freq_Q7, 3 );
|
|
}
|
|
|
|
/* limit delta, to reduce impact of outliers in pitch estimation */
|
|
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 ) );
|
|
|
|
/* update smoother */
|
|
psEncC1->variable_HP_smth1_Q15 = silk_SMLAWB( psEncC1->variable_HP_smth1_Q15,
|
|
silk_SMULBB( psEncC1->speech_activity_Q8, delta_freq_Q7 ), SILK_FIX_CONST( VARIABLE_HP_SMTH_COEF1, 16 ) );
|
|
|
|
/* limit frequency range */
|
|
psEncC1->variable_HP_smth1_Q15 = silk_LIMIT_32( psEncC1->variable_HP_smth1_Q15,
|
|
silk_LSHIFT( silk_lin2log( VARIABLE_HP_MIN_CUTOFF_HZ ), 8 ),
|
|
silk_LSHIFT( silk_lin2log( VARIABLE_HP_MAX_CUTOFF_HZ ), 8 ) );
|
|
}
|
|
}
|