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- /*
- ********************************************************************************
- *
- * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
- * R99 Version 3.3.0
- * REL-4 Version 4.1.0
- *
- ********************************************************************************
- *
- * File : dec_lag3.h
- * Purpose : Decoding of fractional pitch lag with 1/3 resolution.
- * Extract the integer and fraction parts of the pitch lag from
- * the received adaptive codebook index.
- *
- ********************************************************************************
- */
- #ifndef dec_lag3_h
- #define dec_lag3_h "$Id $"
- /*
- ********************************************************************************
- * INCLUDE FILES
- ********************************************************************************
- */
- #include "typedef.h"
- /*
- ********************************************************************************
- * LOCAL VARIABLES AND TABLES
- ********************************************************************************
- */
- /*
- ********************************************************************************
- * DEFINITION OF DATA TYPES
- ********************************************************************************
- */
- /*
- ********************************************************************************
- * DECLARATION OF PROTOTYPES
- ********************************************************************************
- */
- /*************************************************************************
- * FUNCTION: Dec_lag3
- *
- * PURPOSE: Decoding of fractional pitch lag with 1/3 resolution.
- * Extract the integer and fraction parts of the pitch lag from
- * the received adaptive codebook index.
- *
- * See "Enc_lag3.c" for more details about the encoding procedure.
- *
- * The fractional lag in 1st and 3rd subframes is encoded with 8 bits
- * while that in 2nd and 4th subframes is relatively encoded with 4, 5
- * and 6 bits depending on the mode.
- *
- *************************************************************************/
- void Dec_lag3(Word16 index, /* i : received pitch index */
- Word16 T0_min, /* i : minimum of search range */
- Word16 T0_max, /* i : maximum of search range */
- Word16 i_subfr, /* i : subframe flag */
- Word16 T0_prev, /* i : integer pitch delay of last subframe
- used in 2nd and 4th subframes */
- Word16 * T0, /* o : integer part of pitch lag */
- Word16 * T0_frac, /* o : fractional part of pitch lag */
- Word16 flag4 /* i : flag for encoding with 4 bits */
- );
- #endif
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