/*********************************************************************** 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. ***********************************************************************/ #ifdef HAVE_CONFIG_H #include "config.h" #endif /***************************************************************************** * Pitch analyser function ******************************************************************************/ #include "SigProc_FLP.h" #include "SigProc_FIX.h" #include "pitch_est_defines.h" #include "pitch.h" #define SCRATCH_SIZE … /************************************************************/ /* Internally used functions */ /************************************************************/ static void silk_P_Ana_calc_corr_st3( silk_float cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */ const silk_float frame[], /* I vector to correlate */ opus_int start_lag, /* I start lag */ opus_int sf_length, /* I sub frame length */ opus_int nb_subfr, /* I number of subframes */ opus_int complexity, /* I Complexity setting */ int arch /* I Run-time architecture */ ); static void silk_P_Ana_calc_energy_st3( silk_float energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */ const silk_float frame[], /* I vector to correlate */ opus_int start_lag, /* I start lag */ opus_int sf_length, /* I sub frame length */ opus_int nb_subfr, /* I number of subframes */ opus_int complexity /* I Complexity setting */ ); /************************************************************/ /* CORE PITCH ANALYSIS FUNCTION */ /************************************************************/ opus_int silk_pitch_analysis_core_FLP( /* O Voicing estimate: 0 voiced, 1 unvoiced */ const silk_float *frame, /* I Signal of length PE_FRAME_LENGTH_MS*Fs_kHz */ opus_int *pitch_out, /* O Pitch lag values [nb_subfr] */ opus_int16 *lagIndex, /* O Lag Index */ opus_int8 *contourIndex, /* O Pitch contour Index */ silk_float *LTPCorr, /* I/O Normalized correlation; input: value from previous frame */ opus_int prevLag, /* I Last lag of previous frame; set to zero is unvoiced */ const silk_float search_thres1, /* I First stage threshold for lag candidates 0 - 1 */ const silk_float search_thres2, /* I Final threshold for lag candidates 0 - 1 */ const opus_int Fs_kHz, /* I sample frequency (kHz) */ const opus_int complexity, /* I Complexity setting, 0-2, where 2 is highest */ const opus_int nb_subfr, /* I Number of 5 ms subframes */ int arch /* I Run-time architecture */ ) { … } /*********************************************************************** * Calculates the correlations used in stage 3 search. In order to cover * the whole lag codebook for all the searched offset lags (lag +- 2), * the following correlations are needed in each sub frame: * * sf1: lag range [-8,...,7] total 16 correlations * sf2: lag range [-4,...,4] total 9 correlations * sf3: lag range [-3,....4] total 8 correltions * sf4: lag range [-6,....8] total 15 correlations * * In total 48 correlations. The direct implementation computed in worst * case 4*12*5 = 240 correlations, but more likely around 120. ***********************************************************************/ static void silk_P_Ana_calc_corr_st3( silk_float cross_corr_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */ const silk_float frame[], /* I vector to correlate */ opus_int start_lag, /* I start lag */ opus_int sf_length, /* I sub frame length */ opus_int nb_subfr, /* I number of subframes */ opus_int complexity, /* I Complexity setting */ int arch /* I Run-time architecture */ ) { … } /********************************************************************/ /* Calculate the energies for first two subframes. The energies are */ /* calculated recursively. */ /********************************************************************/ static void silk_P_Ana_calc_energy_st3( silk_float energies_st3[ PE_MAX_NB_SUBFR ][ PE_NB_CBKS_STAGE3_MAX ][ PE_NB_STAGE3_LAGS ], /* O 3 DIM correlation array */ const silk_float frame[], /* I vector to correlate */ opus_int start_lag, /* I start lag */ opus_int sf_length, /* I sub frame length */ opus_int nb_subfr, /* I number of subframes */ opus_int complexity /* I Complexity setting */ ) { … }
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