| /* Copyright (C) 2002 Jean-Marc Valin */ |
| /** |
| @file ltp.h |
| @brief Long-Term Prediction functions |
| */ |
| /* |
| 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 the Xiph.org Foundation nor the names of its |
| 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 FOUNDATION 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 <speex/speex_bits.h> |
| #include "arch.h" |
| |
| /** LTP parameters. */ |
| typedef struct { |
| const signed char *gain_cdbk; |
| int gain_bits; |
| int pitch_bits; |
| } ltp_params; |
| |
| #ifdef FIXED_POINT |
| #define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -SHR16(g[0],1)) + (g[2]>0 ? g[2] : -SHR16(g[2],1))) |
| #else |
| #define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -.5*g[0]) + (g[2]>0 ? g[2] : -.5*g[2])) |
| #endif |
| |
| spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len); |
| void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack); |
| |
| void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack); |
| |
| |
| /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
| int pitch_search_3tap( |
| spx_word16_t target[], /* Target vector */ |
| spx_word16_t *sw, |
| spx_coef_t ak[], /* LPCs for this subframe */ |
| spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| spx_sig_t exc[], /* Overlapping codebook */ |
| const void *par, |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| int p, /* Number of LPC coeffs */ |
| int nsf, /* Number of samples in subframe */ |
| SpeexBits *bits, |
| char *stack, |
| spx_word16_t *exc2, |
| spx_word16_t *r, |
| int complexity, |
| int cdbk_offset, |
| int plc_tuning, |
| spx_word32_t *cumul_gain |
| ); |
| |
| /*Unquantize adaptive codebook and update pitch contribution*/ |
| void pitch_unquant_3tap( |
| spx_word16_t exc[], /* Input excitation */ |
| spx_word32_t exc_out[], /* Output excitation */ |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| const void *par, |
| int nsf, /* Number of samples in subframe */ |
| int *pitch_val, |
| spx_word16_t *gain_val, |
| SpeexBits *bits, |
| char *stack, |
| int lost, |
| int subframe_offset, |
| spx_word16_t last_pitch_gain, |
| int cdbk_offset |
| ); |
| |
| /** Forced pitch delay and gain */ |
| int forced_pitch_quant( |
| spx_word16_t target[], /* Target vector */ |
| spx_word16_t *sw, |
| spx_coef_t ak[], /* LPCs for this subframe */ |
| spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| spx_sig_t exc[], /* Excitation */ |
| const void *par, |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| int p, /* Number of LPC coeffs */ |
| int nsf, /* Number of samples in subframe */ |
| SpeexBits *bits, |
| char *stack, |
| spx_word16_t *exc2, |
| spx_word16_t *r, |
| int complexity, |
| int cdbk_offset, |
| int plc_tuning, |
| spx_word32_t *cumul_gain |
| ); |
| |
| /** Unquantize forced pitch delay and gain */ |
| void forced_pitch_unquant( |
| spx_word16_t exc[], /* Input excitation */ |
| spx_word32_t exc_out[], /* Output excitation */ |
| int start, /* Smallest pitch value allowed */ |
| int end, /* Largest pitch value allowed */ |
| spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| const void *par, |
| int nsf, /* Number of samples in subframe */ |
| int *pitch_val, |
| spx_word16_t *gain_val, |
| SpeexBits *bits, |
| char *stack, |
| int lost, |
| int subframe_offset, |
| spx_word16_t last_pitch_gain, |
| int cdbk_offset |
| ); |