1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26 Permission to distribute, modify and use this file under the standard license
27 terms listed above has been obtained from the copyright holder.
28 ****************************************************************************************/
30 ------------------------------------------------------------------------------
36 ------------------------------------------------------------------------------
40 Purpose : Find the pitch period with 1/3 or 1/6 subsample
41 : resolution (closed loop).
43 ------------------------------------------------------------------------------
48 #define pitch_fr_h "$Id $"
50 /*----------------------------------------------------------------------------
52 ----------------------------------------------------------------------------*/
56 /*--------------------------------------------------------------------------*/
62 /*----------------------------------------------------------------------------
64 ; [Define module specific macros here]
65 ----------------------------------------------------------------------------*/
67 /*----------------------------------------------------------------------------
69 ; [Include all pre-processor statements here.]
70 ----------------------------------------------------------------------------*/
72 /*----------------------------------------------------------------------------
73 ; EXTERNAL VARIABLES REFERENCES
74 ; [Declare variables used in this module but defined elsewhere]
75 ----------------------------------------------------------------------------*/
77 /*----------------------------------------------------------------------------
79 ----------------------------------------------------------------------------*/
81 /*----------------------------------------------------------------------------
82 ; ENUMERATED TYPEDEF'S
83 ----------------------------------------------------------------------------*/
85 /*----------------------------------------------------------------------------
86 ; STRUCTURES TYPEDEF'S
87 ----------------------------------------------------------------------------*/
90 Word16 T0_prev_subframe; /* integer pitch lag of previous sub-frame */
93 /*----------------------------------------------------------------------------
94 ; GLOBAL FUNCTION DEFINITIONS
95 ; [List function prototypes here]
96 ----------------------------------------------------------------------------*/
98 Word16 Pitch_fr_init(Pitch_frState **st);
99 /* initialize one instance of the pre processing state.
100 Stores pointer to filter status struct in *st. This pointer has to
101 be passed to Pitch_fr in each call.
105 Word16 Pitch_fr_reset(Pitch_frState *st);
106 /* reset of pre processing state (i.e. set state memory to zero)
110 void Pitch_fr_exit(Pitch_frState **st);
111 /* de-initialize pre processing state (i.e. free status struct)
115 Word16 Pitch_fr( /* o : pitch period (integer) */
116 Pitch_frState *st, /* i/o : State struct */
117 enum Mode mode, /* i : codec mode */
118 Word16 T_op[], /* i : open loop pitch lags */
119 Word16 exc[], /* i : excitation buffer */
120 Word16 xn[], /* i : target vector */
121 Word16 h[], /* i : impulse response of synthesis and
123 Word16 L_subfr, /* i : Length of subframe */
124 Word16 i_subfr, /* i : subframe offset */
125 Word16 *pit_frac, /* o : pitch period (fractional) */
126 Word16 *resu3, /* o : subsample resolution 1/3 (=1) or 1/6 (=0) */
127 Word16 *ana_index, /* o : index of encoding */
135 #endif /* _PITCH_FR_H_ */