/*
 *  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_amrwb.h"
#include "acm_common_defs.h"
#include "acm_neteq.h"
#include "audio_coding_module_typedefs.h"
#include "rw_lock_wrapper.h"
#include "trace.h"
#include "webrtc_neteq.h"
#include "webrtc_neteq_help_macros.h"

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

namespace webrtc
{

#ifndef WEBRTC_CODEC_AMRWB
ACMAMRwb::ACMAMRwb(WebRtc_Word16 /* codecID*/)
{
    return;
}

ACMAMRwb::~ACMAMRwb()
{
    return;
}

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

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

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

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

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

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

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

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



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

void 
ACMAMRwb::DestructEncoderSafe()
{
    return;
}


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

void 
ACMAMRwb::DestructDecoderSafe()
{
    return;
}

WebRtc_Word16 
ACMAMRwb::SetBitRateSafe(
    const WebRtc_Word32 /* rate */)
{
    return -1;
}

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

WebRtc_Word16 
ACMAMRwb::SetAMRwbEncoderPackingFormat(
    ACMAMRPackingFormat /* packingFormat */)
{
    return -1;
}

ACMAMRPackingFormat
ACMAMRwb::AMRwbEncoderPackingFormat() const
{
    return AMRUndefined;
}

WebRtc_Word16 ACMAMRwb::SetAMRwbDecoderPackingFormat(
    ACMAMRPackingFormat /* packingFormat */)
{
    return -1;
}

ACMAMRPackingFormat
ACMAMRwb::AMRwbDecoderPackingFormat() const
{
    return AMRUndefined;
}

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

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

#define AMRWB_MODE_7k       0
#define AMRWB_MODE_9k       1
#define AMRWB_MODE_12k      2
#define AMRWB_MODE_14k      3
#define AMRWB_MODE_16k      4
#define AMRWB_MODE_18k      5
#define AMRWB_MODE_20k      6
#define AMRWB_MODE_23k      7
#define AMRWB_MODE_24k      8

// Remove when integrating a real GSM AMR wrapper
extern WebRtc_Word16 WebRtcAmrWb_CreateEnc(AMRWB_encinst_t_** encInst);
extern WebRtc_Word16 WebRtcAmrWb_CreateDec(AMRWB_decinst_t_** decInst);
extern WebRtc_Word16 WebRtcAmrWb_FreeEnc(AMRWB_encinst_t_* encInst);
extern WebRtc_Word16 WebRtcAmrWb_FreeDec(AMRWB_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcAmrWb_Encode(AMRWB_encinst_t_* encInst,
                                        WebRtc_Word16* input,
                                        WebRtc_Word16 len,
                                        WebRtc_Word16*output,
                                        WebRtc_Word16 mode);
extern WebRtc_Word16 WebRtcAmrWb_EncoderInit(AMRWB_encinst_t_* encInst,
                                             WebRtc_Word16 dtxMode);
extern WebRtc_Word16 WebRtcAmrWb_EncodeBitmode(AMRWB_encinst_t_* encInst,
                                               ACMAMRPackingFormat format);
extern WebRtc_Word16 WebRtcAmrWb_Decode(AMRWB_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcAmrWb_DecodePlc(AMRWB_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcAmrWb_DecoderInit(AMRWB_decinst_t_* decInst);
extern WebRtc_Word16 WebRtcAmrWb_DecodeBitmode(AMRWB_decinst_t_* decInst,
                                               ACMAMRPackingFormat format);


ACMAMRwb::ACMAMRwb(WebRtc_Word16 codecID):
_encoderInstPtr(NULL),
_decoderInstPtr(NULL),
_encodingMode(-1),      // invalid value
_encodingRate(0)        // invalid value
{
    _codecID = codecID;
    _hasInternalDTX = true;
    _encoderPackingFormat = AMRBandwidthEfficient;
    _decoderPackingFormat = AMRBandwidthEfficient;
    return;
}

ACMAMRwb::~ACMAMRwb()
{
    if(_encoderInstPtr != NULL)
    {
        WebRtcAmrWb_FreeEnc(_encoderInstPtr);
        _encoderInstPtr = NULL;
    }
    if(_decoderInstPtr != NULL)
    {
        WebRtcAmrWb_FreeDec(_decoderInstPtr);
        _decoderInstPtr = NULL;
    }
    return;
}

WebRtc_Word16 
ACMAMRwb::InternalEncode(
    WebRtc_UWord8* bitStream, 
    WebRtc_Word16* bitStreamLenByte)
{
    WebRtc_Word16 vadDecision = 1;
    // sanity check, if the rate is set correctly. we might skip this 
    // sanity check. if rate is not set correctly, initialization flag
    // should be false and should not be here.
    if((_encodingMode < AMRWB_MODE_7k) || (_encodingMode > AMRWB_MODE_24k))
    {
        *bitStreamLenByte = 0;
        return -1;
    }
    *bitStreamLenByte = 
        WebRtcAmrWb_Encode(_encoderInstPtr, &_inAudio[_inAudioIxRead],
        _frameLenSmpl, (WebRtc_Word16*)bitStream, _encodingMode);
    
    // Update VAD, if internal DTX is used
    if(_hasInternalDTX && _dtxEnabled)
    {
        if (*bitStreamLenByte <= (7*_frameLenSmpl/160))
        {
            vadDecision = 0;
        }
        for(WebRtc_Word16 n = 0; n < MAX_FRAME_SIZE_10MSEC; n++)
        {
            _vadLabel[n] = vadDecision;
        }
    }
    // 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 
ACMAMRwb::DecodeSafe(
    WebRtc_UWord8* /* bitStream        */,
    WebRtc_Word16  /* bitStreamLenByte */, 
    WebRtc_Word16* /* audio            */, 
    WebRtc_Word16* /* audioSamples     */, 
    WebRtc_Word8*  /* speechType       */)
{
    return 0;
}

WebRtc_Word16 
ACMAMRwb::EnableDTX()
{
    if(_dtxEnabled)
    {
        return 0;
    }
    else if(_encoderExist)  // check if encoder exist
    {
        // enable DTX
        if(WebRtcAmrWb_EncoderInit(_encoderInstPtr, 1) < 0)
        {
            return -1;
        }
        _dtxEnabled = true;
        return 0;
    }
    else
    {
        return -1;
    }
}

WebRtc_Word16 
ACMAMRwb::DisableDTX()
{
    if(!_dtxEnabled)
    {
        return 0;
    }
    else if(_encoderExist)  // check if encoder exist
    {
        // disable DTX
        if(WebRtcAmrWb_EncoderInit(_encoderInstPtr, 0) < 0)
        {
            return -1;
        }
        _dtxEnabled = false;
        return 0;
    }
    else
    {
        // encoder doesn't exists, therefore disabling is harmless
        return 0;
    }
}

WebRtc_Word16 
ACMAMRwb::InternalInitEncoder(
    WebRtcACMCodecParams* codecParams)
{
    // sanity check
    if (_encoderInstPtr == NULL)
    {
        return -1;
    }

    WebRtc_Word16 status = SetBitRateSafe((codecParams->codecInstant).rate);
    status += (WebRtcAmrWb_EncoderInit(
        _encoderInstPtr, ((codecParams->enableDTX)? 1:0)) < 0)? -1:0;
    status += (WebRtcAmrWb_EncodeBitmode(
        _encoderInstPtr, _encoderPackingFormat ) < 0)? -1:0;
    return (status < 0)? -1:0;
}

WebRtc_Word16 
ACMAMRwb::InternalInitDecoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    WebRtc_Word16 status = WebRtcAmrWb_DecodeBitmode(
        _decoderInstPtr, _decoderPackingFormat);
    status += ((WebRtcAmrWb_DecoderInit(_decoderInstPtr) < 0)? -1:0);
    return (status < 0)? -1:0;
}

WebRtc_Word32 
ACMAMRwb::CodecDef(
    WebRtcNetEQ_CodecDef& codecDef,
    const CodecInst&  codecInst)
{
    if (!_decoderInitialized)
    {
        // Todo:
        // log error
        return -1;
    }

    // Fill up the structure by calling 
    // "SET_CODEC_PAR" & "SET_AMRWB_FUNCTION."
    // Then call NetEQ to add the codec to it's
    // database.
    SET_CODEC_PAR((codecDef), kDecoderAMRWB, codecInst.pltype,
        _decoderInstPtr, 16000);
    SET_AMRWB_FUNCTIONS((codecDef));
    return 0;
}

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

WebRtc_Word16 
ACMAMRwb::InternalCreateEncoder()
{
    return WebRtcAmrWb_CreateEnc(&_encoderInstPtr);
}

void 
ACMAMRwb::DestructEncoderSafe()
{
    if(_encoderInstPtr != NULL)
    {
        WebRtcAmrWb_FreeEnc(_encoderInstPtr);
        _encoderInstPtr = NULL;
    }
    // there is no encoder set the following
    _encoderExist = false;
    _encoderInitialized = false;
    _encodingMode = -1;      // invalid value
    _encodingRate = 0;
}


WebRtc_Word16 
ACMAMRwb::InternalCreateDecoder()
{
    return WebRtcAmrWb_CreateDec(&_decoderInstPtr);
}

void 
ACMAMRwb::DestructDecoderSafe()
{
    if(_decoderInstPtr != NULL)
    {
        WebRtcAmrWb_FreeDec(_decoderInstPtr);
        _decoderInstPtr = NULL;
    }
    // there is no encoder instance set the followings
    _decoderExist = false;
    _decoderInitialized = false;
}

WebRtc_Word16 
ACMAMRwb::SetBitRateSafe(
    const WebRtc_Word32 rate)
{
    switch(rate)
    {
    case 7000:
        {
            _encodingMode = AMRWB_MODE_7k;
            _encodingRate = 7000;
            break;
        }
    case 9000:
        {
            _encodingMode = AMRWB_MODE_9k;
            _encodingRate = 9000;
            break;
        }
    case 12000:
        {
            _encodingMode = AMRWB_MODE_12k;
            _encodingRate = 12000;
            break;
        }
    case 14000:
        {
            _encodingMode = AMRWB_MODE_14k;
            _encodingRate = 14000;
            break;
        }
    case 16000:
        {
            _encodingMode = AMRWB_MODE_16k;
            _encodingRate = 16000;
            break;
        }
    case 18000:
        {
            _encodingMode = AMRWB_MODE_18k;
            _encodingRate = 18000;
            break;
        }
    case 20000:
        {
            _encodingMode = AMRWB_MODE_20k;
            _encodingRate = 20000;
            break;
        }
    case 23000:
        {
            _encodingMode = AMRWB_MODE_23k;
            _encodingRate = 23000;
            break;
        }
    case 24000:
        {
            _encodingMode = AMRWB_MODE_24k;
            _encodingRate = 24000;
            break;
        }
    default:
        {
            return -1;
            break;
        }
    }
    return 0;
}

void 
ACMAMRwb::InternalDestructEncoderInst(
    void* ptrInst)
{
    if(ptrInst != NULL)
    {
        WebRtcAmrWb_FreeEnc((AMRWB_encinst_t_*)ptrInst);
    }
    return;
}

WebRtc_Word16 
ACMAMRwb::SetAMRwbEncoderPackingFormat(
    ACMAMRPackingFormat packingFormat)
{
    if((packingFormat != AMRBandwidthEfficient) &&
        (packingFormat != AMROctetAlligned) &&
        (packingFormat != AMRFileStorage))
    {
        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID,
            "Invalid AMRwb encoder packing-format.");
        return -1;
    }
    else
    {
        
        if(WebRtcAmrWb_EncodeBitmode(_encoderInstPtr,
            packingFormat) < 0)
        {
            return -1;
        }
        else
        {
            _encoderPackingFormat = packingFormat;
            return 0;
        }
    }
}

ACMAMRPackingFormat
ACMAMRwb::AMRwbEncoderPackingFormat() const
{
    return _encoderPackingFormat;
}

WebRtc_Word16 ACMAMRwb::SetAMRwbDecoderPackingFormat(
    ACMAMRPackingFormat packingFormat)
{
    if((packingFormat != AMRBandwidthEfficient) &&
        (packingFormat != AMROctetAlligned) &&
        (packingFormat != AMRFileStorage))
    {
        WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, _uniqueID,
            "Invalid AMRwb decoder packing-format.");
        return -1;
    }
    else
    {
        if(WebRtcAmrWb_DecodeBitmode(_decoderInstPtr,
            packingFormat) < 0)
        {
            return -1;
        }
        else
        {
            _decoderPackingFormat = packingFormat;
            return 0;
        }
    }
}

ACMAMRPackingFormat
ACMAMRwb::AMRwbDecoderPackingFormat() const
{
    return _decoderPackingFormat;
}

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

} // namespace webrtc