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ltp.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin 
00002    File: ltp.h
00003    Long-Term Prediction functions
00004 
00005    Redistribution and use in source and binary forms, with or without
00006    modification, are permitted provided that the following conditions
00007    are met:
00008    
00009    - Redistributions of source code must retain the above copyright
00010    notice, this list of conditions and the following disclaimer.
00011    
00012    - Redistributions in binary form must reproduce the above copyright
00013    notice, this list of conditions and the following disclaimer in the
00014    documentation and/or other materials provided with the distribution.
00015    
00016    - Neither the name of the Xiph.org Foundation nor the names of its
00017    contributors may be used to endorse or promote products derived from
00018    this software without specific prior written permission.
00019    
00020    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00021    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00022    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00023    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
00024    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00025    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00026    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 */
00032 
00033 #include "speex_bits.h"
00034 
00035 
00036 typedef struct ltp_params {
00037    signed char *gain_cdbk;
00038    int     gain_bits;
00039    int     pitch_bits;
00040 } ltp_params;
00041 
00042 
00043 void open_loop_nbest_pitch(float *sw, int start, int end, int len, int *pitch, float *gain, int N, char *stack);
00044 
00045 
00047 int pitch_search_3tap(
00048 float target[],                 /* Target vector */
00049 float *sw,
00050 float ak[],                     /* LPCs for this subframe */
00051 float awk1[],                   /* Weighted LPCs #1 for this subframe */
00052 float awk2[],                   /* Weighted LPCs #2 for this subframe */
00053 float exc[],                    /* Overlapping codebook */
00054 void *par,
00055 int   start,                    /* Smallest pitch value allowed */
00056 int   end,                      /* Largest pitch value allowed */
00057 float pitch_coef,               /* Voicing (pitch) coefficient */
00058 int   p,                        /* Number of LPC coeffs */
00059 int   nsf,                      /* Number of samples in subframe */
00060 SpeexBits *bits,
00061 char *stack,
00062 float *exc2,
00063 float *r,
00064 int   complexity
00065 );
00066 
00067 /*Unquantize adaptive codebook and update pitch contribution*/
00068 void pitch_unquant_3tap(
00069 float exc[],                    /* Excitation */
00070 int   start,                    /* Smallest pitch value allowed */
00071 int   end,                      /* Largest pitch value allowed */
00072 float pitch_coef,               /* Voicing (pitch) coefficient */
00073 void *par,
00074 int   nsf,                      /* Number of samples in subframe */
00075 int *pitch_val,
00076 float *gain_val,
00077 SpeexBits *bits,
00078 char *stack,
00079 int lost,
00080 int subframe_offset,
00081 float last_pitch_gain
00082 );
00083 
00084 float pitch_gain_search_3tap(
00085 float target[],                 /* Target vector */
00086 float ak[],                     /* LPCs for this subframe */
00087 float awk1[],                   /* Weighted LPCs #1 for this subframe */
00088 float awk2[],                   /* Weighted LPCs #2 for this subframe */
00089 float exc[],                    /* Excitation */
00090 void *par,
00091 int   pitch,                    /* Pitch value */
00092 int   p,                        /* Number of LPC coeffs */
00093 int   nsf,                      /* Number of samples in subframe */
00094 SpeexBits *bits,
00095 char *stack,
00096 float *exc2,
00097 float *r,
00098 int  *cdbk_index
00099 );
00100 
00101 
00103 int forced_pitch_quant(
00104 float target[],                 /* Target vector */
00105 float *sw,
00106 float ak[],                     /* LPCs for this subframe */
00107 float awk1[],                   /* Weighted LPCs #1 for this subframe */
00108 float awk2[],                   /* Weighted LPCs #2 for this subframe */
00109 float exc[],                    /* Excitation */
00110 void *par,
00111 int   start,                    /* Smallest pitch value allowed */
00112 int   end,                      /* Largest pitch value allowed */
00113 float pitch_coef,               /* Voicing (pitch) coefficient */
00114 int   p,                        /* Number of LPC coeffs */
00115 int   nsf,                      /* Number of samples in subframe */
00116 SpeexBits *bits,
00117 char *stack,
00118 float *exc2,
00119 float *r,
00120 int complexity
00121 );
00122 
00124 void forced_pitch_unquant(
00125 float exc[],                    /* Excitation */
00126 int   start,                    /* Smallest pitch value allowed */
00127 int   end,                      /* Largest pitch value allowed */
00128 float pitch_coef,               /* Voicing (pitch) coefficient */
00129 void *par,
00130 int   nsf,                      /* Number of samples in subframe */
00131 int *pitch_val,
00132 float *gain_val,
00133 SpeexBits *bits,
00134 char *stack,
00135 int lost,
00136 int subframe_offset,
00137 float last_pitch_gain
00138 );

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