pvgsmamrdecoder.cpp

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.
****************************************************************************************/
//                                                                              //
//  File: PVGSMAMRDecoder.cpp                                                   //
//                                                                              //
//////////////////////////////////////////////////////////////////////////////////

#include "PVGSMAMRDecoder.h"


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF CPVGSMAMRDecoder::CPVGSMAMRDecoder()
{
}


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF CPVGSMAMRDecoder::~CPVGSMAMRDecoder()
{
    delete iDecState;
    iDecState = NULL;
}


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF int32 CPVGSMAMRDecoder::InitDecoder(void)
{
    return GSMInitDecode(&iDecState, (int8*)"Decoder");
}


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF int32 CPVGSMAMRDecoder::DecodeFrame(Frame_Type_3GPP aType,
        uint8* aCompressedBlock,
        uint8* aAudioBuffer,
        int32 aFormat)
{
    return AMRDecode(iDecState, aType, aCompressedBlock, (Word16*)aAudioBuffer, (Word16) aFormat);
}


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF int32 CPVGSMAMRDecoder::ResetDecoder(void)
{
    return Speech_Decode_Frame_reset(iDecState);
}


/////////////////////////////////////////////////////////////////////////////
OSCL_EXPORT_REF void CPVGSMAMRDecoder::TerminateDecoder(void)
{
    GSMDecodeFrameExit(&iDecState);
    iDecState = NULL;
}