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| 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 *c
orr, 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 *p
itch, 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 ); |
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Chromium Code Reviews
Issue 3119024:
Add speex to trunk/deps/third_party/.... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/