modules/audio_coding/main/source/acm_cng.cc

/*
 *  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_cng.h"
#include "acm_codec_database.h"
#include "acm_common_defs.h"
#include "acm_neteq.h"
#include "trace.h"
#include "webrtc_cng.h"
#include "webrtc_neteq.h"
#include "webrtc_neteq_help_macros.h"

namespace webrtc
{

ACMCNG::ACMCNG(WebRtc_Word16 codecID)
{
    _encoderInstPtr = NULL;
    _decoderInstPtr = NULL;
    _codecID = codecID;
    if(_codecID == ACMCodecDB::cnNB)
    {
        _sampFreqHz = 8000;
    }
    else if(_codecID == ACMCodecDB::cnWB)
    {
        _sampFreqHz = 16000;
    }
    else if(_codecID == ACMCodecDB::cnSWB)
    {
        _sampFreqHz = 32000;
    }
    else
    {
        _sampFreqHz = -1;
    }
    return;
}


ACMCNG::~ACMCNG()
{
    if(_encoderInstPtr != NULL)
    {
        WebRtcCng_FreeEnc(_encoderInstPtr);
        _encoderInstPtr = NULL;
    }
    if(_decoderInstPtr != NULL)
    {
        WebRtcCng_FreeDec(_decoderInstPtr);
        _decoderInstPtr = NULL;
    }
    return;
}


// CNG is not like a regular encoder, this function
// should not be called normally
// instead the following function is called from inside
// ACMGenericCodec::ProcessFrameVADDTX
WebRtc_Word16
ACMCNG::InternalEncode(
    WebRtc_UWord8* /* bitStream        */,
    WebRtc_Word16* /* bitStreamLenByte */)
{
    return -1;
}

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


// CNG is not like a regular encoder,
// this function should not be called normally
// instead the following function is called from inside
// ACMGenericCodec::ProcessFrameVADDTX
WebRtc_Word16
ACMCNG::InternalInitEncoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    return -1;
}


WebRtc_Word16
ACMCNG::InternalInitDecoder(
    WebRtcACMCodecParams* /* codecParams */)
{
    return WebRtcCng_InitDec(_decoderInstPtr);
}


WebRtc_Word32
ACMCNG::CodecDef(
    WebRtcNetEQ_CodecDef& codecDef,
    const CodecInst&      codecInst)
{
    if (!_decoderInitialized)
    {
        // TODO (tlegrand): log error
        return -1;
    }
    // Fill up the structure by calling
    // "SET_CODEC_PAR" & "SET_CNG_FUNCTION."
    // Then return the structure back to NetEQ to add the codec to it's
    // database.

    if (_sampFreqHz == 8000 || _sampFreqHz == 16000 || _sampFreqHz == 32000)
    {
        SET_CODEC_PAR((codecDef), kDecoderCNG, codecInst.pltype,
            _decoderInstPtr, _sampFreqHz);
        SET_CNG_FUNCTIONS((codecDef));
        return 0;
    }
    else
    {
        return -1;
    }
}


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


WebRtc_Word16
ACMCNG::InternalCreateEncoder()
{
    if(WebRtcCng_CreateEnc(&_encoderInstPtr) < 0)
    {
        _encoderInstPtr = NULL;
        return -1;
    }
    else
    {
        return 0;
    }
}


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


WebRtc_Word16
ACMCNG::InternalCreateDecoder()
{
    if(WebRtcCng_CreateDec(&_decoderInstPtr) < 0)
    {
        _decoderInstPtr = NULL;
        return -1;
    }
    else
    {
        return 0;
    }
}


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


void
ACMCNG::InternalDestructEncoderInst(
    void* ptrInst)
{
    if(ptrInst != NULL)
    {
        WebRtcCng_FreeEnc((CNG_enc_inst*)ptrInst);
    }
    return;
}

WebRtc_Word16
ACMCNG::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(kDecoderCNG);
}

} // namespace webrtc