/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "acm_common_defs.h"
#include "acm_gsmfr.h"
#include "acm_neteq.h"
#include "trace.h"
#include "webrtc_neteq.h"
#include "webrtc_neteq_help_macros.h"

#ifdef WEBRTC_CODEC_GSMFR
    // NOTE! GSM-FR is not included in the open-source package. Modify this file or your codec
    // API to match the function call and name of used GSM-FR API file.
    // #include "gsmfr_interface.h"
#endif

namespace webrtc
{

#ifndef WEBRTC_CODEC_GSMFR

ACMGSMFR::ACMGSMFR(
    WebRtc_Word16 /* codecID */)
{
    return;
}


ACMGSMFR::~ACMGSMFR()
{
    return;
}


WebRtc_Word16 
ACMGSMFR::InternalEncode(
    WebRtc_UWord8* /* bitStream        */, 
    WebRtc_Word16* /* bitStreamLenByte */)
{
    return -1;
}


WebRtc_Word16 
ACMGSMFR::DecodeSafe(
    WebRtc_UWord8* /* bitStream        */, 
    WebRtc_Word16  /* bitStreamLenByte */, 
    WebRtc_Word16* /* audio            */, 
    WebRtc_Word16* /* audioSamples     */, 
    WebRtc_Word8*  /* speechType       */)
{
    return -1;
}


WebRtc_Word16 
ACMGSMFR::EnableDTX()
{
    return -1;
}


WebRtc_Word16 
ACMGSMFR::DisableDTX()
{
    return -1;
}


WebRtc_Word16 
ACMGSMFR::InternalInitEncoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    return -1;
}


WebRtc_Word16 
ACMGSMFR::InternalInitDecoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    return -1;
}


WebRtc_Word32 
ACMGSMFR::CodecDef(
    WebRtcNetEQ_CodecDef& /* codecDef  */, 
    const CodecInst&      /* codecInst */)
{
    return -1;
}


ACMGenericCodec* 
ACMGSMFR::CreateInstance(void)
{
    return NULL;
}


WebRtc_Word16 
ACMGSMFR::InternalCreateEncoder()
{
    return -1;
}


void 
ACMGSMFR::DestructEncoderSafe()
{
    return;
}


WebRtc_Word16 
ACMGSMFR::InternalCreateDecoder()
{
    return -1;
}


void 
ACMGSMFR::DestructDecoderSafe()
{
    return;
}


void 
ACMGSMFR::InternalDestructEncoderInst(
    void* /* ptrInst */)
{
    return;
}


WebRtc_Word16 
ACMGSMFR::UnregisterFromNetEqSafe(
    ACMNetEQ*     /* netEq       */,
    WebRtc_Word16 /* payloadType */)
{
    return -1;
}


#else     //===================== Actual Implementation =======================

// Remove when integrating a real GSM FR wrapper
extern WebRtc_Word16 WebRtcGSMFR_CreateEnc(GSMFR_encinst_t_** inst);
extern WebRtc_Word16 WebRtcGSMFR_CreateDec(GSMFR_decinst_t_** inst);
extern WebRtc_Word16 WebRtcGSMFR_FreeEnc(GSMFR_encinst_t_* inst);
extern WebRtc_Word16 WebRtcGSMFR_FreeDec(GSMFR_decinst_t_* inst);
extern WebRtc_Word16 WebRtcGSMFR_Encode(GSMFR_encinst_t_* encInst, WebRtc_Word16* input,
                                        WebRtc_Word16 len, WebRtc_Word16* output);
extern WebRtc_Word16 WebRtcGSMFR_EncoderInit(GSMFR_encinst_t_* encInst, WebRtc_Word16 mode);
extern WebRtc_Word16 WebRtcGSMFR_Decode(GSMFR_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcGSMFR_DecodeBwe(GSMFR_decinst_t_* decInst, WebRtc_Word16* input);
extern WebRtc_Word16 WebRtcGSMFR_DecodePlc(GSMFR_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcGSMFR_DecoderInit(GSMFR_decinst_t_* decInst);

ACMGSMFR::ACMGSMFR(
    WebRtc_Word16 codecID):
_encoderInstPtr(NULL),
_decoderInstPtr(NULL)
{
    _codecID = codecID;
    _hasInternalDTX = true;
    return;
}


ACMGSMFR::~ACMGSMFR()
{
    if(_encoderInstPtr != NULL)
    {
        WebRtcGSMFR_FreeEnc(_encoderInstPtr);
        _encoderInstPtr = NULL;
    }
    if(_decoderInstPtr != NULL)
    {
        WebRtcGSMFR_FreeDec(_decoderInstPtr);
        _decoderInstPtr = NULL;
    }
    return;
}


WebRtc_Word16 
ACMGSMFR::InternalEncode(
    WebRtc_UWord8* bitStream, 
    WebRtc_Word16* bitStreamLenByte)
{
    *bitStreamLenByte = WebRtcGSMFR_Encode(_encoderInstPtr,
        &_inAudio[_inAudioIxRead], _frameLenSmpl, (WebRtc_Word16*)bitStream);
    // increment the read index this tell the caller that how far 
    // we have gone forward in reading the audio buffer
    _inAudioIxRead += _frameLenSmpl;
    return *bitStreamLenByte;
}


WebRtc_Word16 
ACMGSMFR::DecodeSafe(
    WebRtc_UWord8* /* bitStream        */, 
    WebRtc_Word16  /* bitStreamLenByte */, 
    WebRtc_Word16* /* audio            */, 
    WebRtc_Word16* /* audioSamples     */, 
    WebRtc_Word8*  /* speechType       */)
{
    return 0;
}


WebRtc_Word16 
ACMGSMFR::EnableDTX()
{
    if(_dtxEnabled)
    {
        return 0;
    }
    else if(_encoderExist)
    {
        if(WebRtcGSMFR_EncoderInit(_encoderInstPtr, 1) < 0)
        {
			WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
				"EnableDTX: cannot init encoder for GSMFR");
            return -1;
        }
        _dtxEnabled = true;
        return 0;
    }
    else
    {
        return -1;
    }
}


WebRtc_Word16 
ACMGSMFR::DisableDTX()
{
    if(!_dtxEnabled)
    {
        return 0;
    }
    else if(_encoderExist)
    {
        if(WebRtcGSMFR_EncoderInit(_encoderInstPtr, 0) < 0)
        {
			WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
				"DisableDTX: cannot init encoder for GSMFR");
            return -1;
        }
        _dtxEnabled = false;
        return 0;
    }
    else
    {
        // encoder doesn't exists, therefore disabling is harmless
        return 0;
    }
}


WebRtc_Word16 
ACMGSMFR::InternalInitEncoder(
    WebRtcACMCodecParams* codecParams)
{
    if (WebRtcGSMFR_EncoderInit(_encoderInstPtr, ((codecParams->enableDTX)? 1:0)) < 0)
	{
		WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			"InternalInitEncoder: cannot init encoder for GSMFR"); 
	}
	return 0;
}


WebRtc_Word16 
ACMGSMFR::InternalInitDecoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    if (WebRtcGSMFR_DecoderInit(_decoderInstPtr) < 0)
	{
		WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			 "InternalInitDecoder: cannot init decoder for GSMFR"); 		
		return -1;
	}
	return 0;
}


WebRtc_Word32 
ACMGSMFR::CodecDef(
    WebRtcNetEQ_CodecDef& codecDef,
    const CodecInst&      codecInst)
{
    if (!_decoderInitialized)
    {
		WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			"CodecDef: decoder is not initialized for GSMFR");
        return -1;
    }
    // Fill up the structure by calling 
    // "SET_CODEC_PAR" & "SET_GSMFR_FUNCTION."
    // Then call NetEQ to add the codec to it's
    // database.
    SET_CODEC_PAR((codecDef), kDecoderGSMFR, codecInst.pltype,
        _decoderInstPtr, 8000);
    SET_GSMFR_FUNCTIONS((codecDef));
    return 0;
}


ACMGenericCodec* 
ACMGSMFR::CreateInstance(void)
{
    return NULL;
}


WebRtc_Word16 
ACMGSMFR::InternalCreateEncoder()
{
    if (WebRtcGSMFR_CreateEnc(&_encoderInstPtr) < 0)
	{
		 WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			 "InternalCreateEncoder: cannot create instance for GSMFR encoder"); 
		return -1;
	}
	return 0;
}


void 
ACMGSMFR::DestructEncoderSafe()
{
    if(_encoderInstPtr != NULL)
    {
        WebRtcGSMFR_FreeEnc(_encoderInstPtr);
        _encoderInstPtr = NULL;
    }
    _encoderExist = false;
    _encoderInitialized = false;
}


WebRtc_Word16 
ACMGSMFR::InternalCreateDecoder()
{
    if (WebRtcGSMFR_CreateDec(&_decoderInstPtr) < 0)
	{
		WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			 "InternalCreateDecoder: cannot create instance for GSMFR decoder"); 
		return -1;
	}
	return 0;
}


void 
ACMGSMFR::DestructDecoderSafe()
{
    if(_decoderInstPtr != NULL)
    {
        WebRtcGSMFR_FreeDec(_decoderInstPtr);
        _decoderInstPtr = NULL;
    }
    _decoderExist = false;
    _decoderInitialized = false;
}


void 
ACMGSMFR::InternalDestructEncoderInst(
    void* ptrInst)
{
    if(ptrInst != NULL)
    {
        WebRtcGSMFR_FreeEnc((GSMFR_encinst_t_*)ptrInst);
    }
    return;
}


WebRtc_Word16 
ACMGSMFR::UnregisterFromNetEqSafe(
    ACMNetEQ*     netEq,
    WebRtc_Word16 payloadType)
{
    if(payloadType != _decoderParams.codecInstant.pltype)
    {
        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID, 
			"Cannot unregister codec: payload-type does not match \
the stored payload type", 
            _decoderParams.codecInstant.plname, 
            payloadType, 
            _decoderParams.codecInstant.pltype);
        return -1;
    }
    return netEq->RemoveCodec(kDecoderGSMFR);
}

#endif

} // namespace webrtc