apps/codecs/libspeex/ltp.h

   1 /* Copyright (C) 2002 Jean-Marc Valin */
   2 /**
   3    @file ltp.h
   4    @brief Long-Term Prediction functions
   5 */
   6 /*
   7    Redistribution and use in source and binary forms, with or without
   8    modification, are permitted provided that the following conditions
   9    are met:
  10
  11    - Redistributions of source code must retain the above copyright
  12    notice, this list of conditions and the following disclaimer.
  13
  14    - Redistributions in binary form must reproduce the above copyright
  15    notice, this list of conditions and the following disclaimer in the
  16    documentation and/or other materials provided with the distribution.
  17
  18    - Neither the name of the Xiph.org Foundation nor the names of its
  19    contributors may be used to endorse or promote products derived from
  20    this software without specific prior written permission.
  21
  22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  26    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  27    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  29    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35 #include "speex/speex_bits.h"
  36 #include "arch.h"
  37
  38 /** LTP parameters. */
  39 typedef struct {
  40    const signed char *gain_cdbk;
  41    int     gain_bits;
  42    int     pitch_bits;
  43 } ltp_params;
  44
  45 #ifdef FIXED_POINT
  46 #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)))
  47 #else
  48 #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]))
  49 #endif
  50
  51 spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len);
  52 void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack);
  53
  54 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);
  55
  56
  57 /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */
  58 int pitch_search_3tap(
  59 spx_word16_t target[],                 /* Target vector */
  60 spx_word16_t *sw,
  61 spx_coef_t ak[],                     /* LPCs for this subframe */
  62 spx_coef_t awk1[],                   /* Weighted LPCs #1 for this subframe */
  63 spx_coef_t awk2[],                   /* Weighted LPCs #2 for this subframe */
  64 spx_sig_t exc[],                    /* Overlapping codebook */
  65 const void *par,
  66 int   start,                    /* Smallest pitch value allowed */
  67 int   end,                      /* Largest pitch value allowed */
  68 spx_word16_t pitch_coef,               /* Voicing (pitch) coefficient */
  69 int   p,                        /* Number of LPC coeffs */
  70 int   nsf,                      /* Number of samples in subframe */
  71 SpeexBits *bits,
  72 char *stack,
  73 spx_word16_t *exc2,
  74 spx_word16_t *r,
  75 int   complexity,
  76 int   cdbk_offset,
  77 int plc_tuning,
  78 spx_word32_t *cumul_gain
  79 );
  80
  81 /*Unquantize adaptive codebook and update pitch contribution*/
  82 void pitch_unquant_3tap(
  83 spx_word16_t exc[],             /* Input excitation */
  84 spx_word32_t exc_out[],         /* Output excitation */
  85 int   start,                    /* Smallest pitch value allowed */
  86 int   end,                      /* Largest pitch value allowed */
  87 spx_word16_t pitch_coef,        /* Voicing (pitch) coefficient */
  88 const void *par,
  89 int   nsf,                      /* Number of samples in subframe */
  90 int *pitch_val,
  91 spx_word16_t *gain_val,
  92 SpeexBits *bits,
  93 char *stack,
  94 int lost,
  95 int subframe_offset,
  96 spx_word16_t last_pitch_gain,
  97 int cdbk_offset
  98 );
  99
 100 /** Forced pitch delay and gain */
 101 int forced_pitch_quant(
 102 spx_word16_t target[],                 /* Target vector */
 103 spx_word16_t *sw,
 104 spx_coef_t ak[],                     /* LPCs for this subframe */
 105 spx_coef_t awk1[],                   /* Weighted LPCs #1 for this subframe */
 106 spx_coef_t awk2[],                   /* Weighted LPCs #2 for this subframe */
 107 spx_sig_t exc[],                    /* Excitation */
 108 const void *par,
 109 int   start,                    /* Smallest pitch value allowed */
 110 int   end,                      /* Largest pitch value allowed */
 111 spx_word16_t pitch_coef,               /* Voicing (pitch) coefficient */
 112 int   p,                        /* Number of LPC coeffs */
 113 int   nsf,                      /* Number of samples in subframe */
 114 SpeexBits *bits,
 115 char *stack,
 116 spx_word16_t *exc2,
 117 spx_word16_t *r,
 118 int complexity,
 119 int cdbk_offset,
 120 int plc_tuning,
 121 spx_word32_t *cumul_gain
 122 );
 123
 124 /** Unquantize forced pitch delay and gain */
 125 void forced_pitch_unquant(
 126 spx_word16_t exc[],             /* Input excitation */
 127 spx_word32_t exc_out[],         /* Output excitation */
 128 int   start,                    /* Smallest pitch value allowed */
 129 int   end,                      /* Largest pitch value allowed */
 130 spx_word16_t pitch_coef,        /* Voicing (pitch) coefficient */
 131 const void *par,
 132 int   nsf,                      /* Number of samples in subframe */
 133 int *pitch_val,
 134 spx_word16_t *gain_val,
 135 SpeexBits *bits,
 136 char *stack,
 137 int lost,
 138 int subframe_offset,
 139 spx_word16_t last_pitch_gain,
 140 int cdbk_offset
 141 );