sid_sync.h

实现3GPP的GSM中AMR语音的CODECS。

/* ------------------------------------------------------------------
 * Copyright (C) 2008 PacketVideo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 * -------------------------------------------------------------------
 */
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:

    3GPP TS 26.073
    ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
    Available from http://www.3gpp.org

(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------



 Filename: /audio/gsm-amr/c/include/sid_sync.h

     Date: 03/13/2002

------------------------------------------------------------------------------
 REVISION HISTORY

 Description: Added PV coding template sections to 3GPP version 3.2.0.

 Description:  Replaced "int" and/or "char" with OSCL defined types.

 Description: Moved _cplusplus #ifdef after Include section.

 Description:

------------------------------------------------------------------------------
 INCLUDE DESCRIPTION

 This file contains the type definition and function prototypes used by the
 SID synchronization functions.

------------------------------------------------------------------------------
*/

#ifndef _SID_SYNC_H_
#define _SID_SYNC_H_

/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "typedef.h"
#include "mode.h"
#include "frame.h"

/*--------------------------------------------------------------------------*/
#ifdef __cplusplus
extern "C"
{
#endif

    /*----------------------------------------------------------------------------
    ; MACROS
    ; [Define module specific macros here]
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; DEFINES
    ; [Include all pre-processor statements here.]
    ----------------------------------------------------------------------------*/
#define sid_sync_h "$Id $"

    /*----------------------------------------------------------------------------
    ; EXTERNAL VARIABLES REFERENCES
    ; [Declare variables used in this module but defined elsewhere]
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; SIMPLE TYPEDEF'S
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; ENUMERATED TYPEDEF'S
    ----------------------------------------------------------------------------*/

    /*----------------------------------------------------------------------------
    ; STRUCTURES TYPEDEF'S
    ----------------------------------------------------------------------------*/
    typedef struct
    {
        Word16 sid_update_rate;  /* Send SID Update every sid_update_rate frame */
        Word16 sid_update_counter; /* Number of frames since last SID          */
        Word16 sid_handover_debt;  /* Number of extra SID_UPD frames to schedule*/
        enum TXFrameType prev_ft;
    } sid_syncState;

    /*----------------------------------------------------------------------------
    ; GLOBAL FUNCTION DEFINITIONS
    ; [List function prototypes here]
    ----------------------------------------------------------------------------*/
    /* initialize one instance of the sid_sync module
       Stores pointer to state struct in *st. This pointer has to
       be passed to sid_sync in each call.
       returns 0 on success
     */
    Word16 sid_sync_init(void **st);

    /* reset of sid_sync module (i.e. set state memory to zero)
       returns 0 on success
     */
    Word16 sid_sync_reset(void *st);

    /* de-initialize sid_sync module (i.e. free status struct)
       stores NULL in *st
     */
    void sid_sync_exit(void **st);

    /*  update handover debt
        debtFrames extra SID_UPD are scheduled .
        to update remote decoder CNI states, right after an handover.
        (primarily for use on MS UL side )
    */
    void sid_sync_set_handover_debt(sid_syncState *st,  /* i/o: sid_sync state  */
                                    Word16 debtFrames);

    /* To ensure that the mode only switches to a neighbouring mode */
    void sid_sync(void *st ,
                  enum Mode mode,
                  enum TXFrameType *tx_frame_type);

#ifdef __cplusplus
}
#endif

#endif  /* _SID_SYNC_H_ */