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Diffstat (limited to 'code/libspeex/ltp.h')
| -rw-r--r-- | code/libspeex/ltp.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/code/libspeex/ltp.h b/code/libspeex/ltp.h new file mode 100644 index 0000000..1e435bc --- /dev/null +++ b/code/libspeex/ltp.h @@ -0,0 +1,141 @@ +/* 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 +); |