Distorted sound in AAC encoder output

[Artem_O_]

Hello,

I try to encode PCM mu-law audio (8000Hz, 16 bits per sample, 1 channel) from IP-camera with UMC AACEncoder (ipp-samples.8.0.0.005). The output audio is very distorted (see in attachment). I guess I use wrong parameters while encoder initialising. Please check my code and tell me where I am wrong?

#include "AACEncoder.h"

#include <ipps.h>
#include <umc_linear_buffer.h>

using namespace NVeedo;

CAACEncoder::CAACEncoder(void)
    :   m_pMediaBuffer(0)
{
}


CAACEncoder::~CAACEncoder(void)
{
    m_Encoder.Close();

    UMC_DELETE(m_pMediaBuffer);
}


bool CAACEncoder::Init()
{
    m_pMediaBuffer = (UMC::MediaBuffer*) new UMC::LinearBuffer();

    // Input data parameters
    m_AACEncParams.m_info.streamType                    = UMC::MULAW_AUDIO;
//    m_AACEncParams.m_info.audioInfo.m_iChannelMask      = 0;
    m_AACEncParams.m_info.audioInfo.m_iChannels         = 1;
    m_AACEncParams.m_info.audioInfo.m_iBitPerSample     = 16;
    m_AACEncParams.m_info.audioInfo.m_iSampleFrequency  = 8000;

    m_AACEncParams.m_info.iBitrate                      = 32000; //48000;

    // Output stream parameters
    m_AACEncParams.audioObjectType                      = AOT_AAC_LC;
    m_AACEncParams.auxAudioObjectType                   = AOT_UNDEF;
    m_AACEncParams.outputFormat                         = UMC_AAC_ADTS;
    m_AACEncParams.stereo_mode                          = UMC_AAC_MONO;
    m_AACEncParams.ns_mode                              = 0;

    m_AACEncParams.m_pData                              = 0;

    if(UMC::UMC_OK != m_Encoder.Init(&m_AACEncParams))
    {
        std::cerr << "Audio codec init failed" << std::endl;
        return false;
    }

    UMC::Status             nStatus = UMC::UMC_OK;
    UMC::AACEncoderParams   CodecParams;

    nStatus = m_Encoder.GetInfo(&CodecParams);
    if(nStatus < 0)
    {
        std::cerr << "Audio codec GetInfo() failed" << std::endl;
        return false;
    }

    m_OutData.Alloc(CodecParams.m_iSuggestedOutputSize);

    m_MediaBufferParams.m_numberOfFrames        = 10;
    m_MediaBufferParams.m_prefInputBufferSize   = CodecParams.m_iSuggestedInputSize  * m_MediaBufferParams.m_numberOfFrames;
    m_MediaBufferParams.m_prefOutputBufferSize  = CodecParams.m_iSuggestedOutputSize * m_MediaBufferParams.m_numberOfFrames;

    if (UMC::UMC_OK != m_pMediaBuffer->Init(&m_MediaBufferParams))
    {
        std::cerr << "Media buffer init failed" << std::endl;
        return false;
    }

    std::cout << "AAC codec initialized successfully" << std::endl;

    m_AACEncParams.m_info.streamType                    = UMC::AAC_AUDIO;

    return true;
}

bool CAACEncoder::Encode(void* pBuffer, int nLength)
{
    UMC::Status nStatus = m_pMediaBuffer->LockInputBuffer(&m_InMediaBuffer);
    if(UMC::UMC_OK != nStatus)
        return false;

    int nMediaBufferSize = m_InMediaBuffer.GetBufferSize();
    if (nMediaBufferSize < nLength)
    {
        int nBreak = 1;
    }

    // Copy audio data
    ippsCopy_8u((Ipp8u*) pBuffer, (Ipp8u*) m_InMediaBuffer.GetBufferPointer(), nLength);
    m_InMediaBuffer.SetDataSize(nLength);

    m_pMediaBuffer->UnLockInputBuffer(&m_InMediaBuffer);

    nStatus = m_pMediaBuffer->LockOutputBuffer(&m_OutMediaBuffer);
    if(UMC::UMC_OK != nStatus)
        return false;

    nStatus = m_Encoder.GetFrame(&m_OutMediaBuffer, &m_OutData);
    m_pMediaBuffer->UnLockOutputBuffer(&m_OutMediaBuffer);

    if(UMC::UMC_OK != nStatus)
    {
        return false;
    }

    return true;
}

UMC::MediaData* CAACEncoder::GetFrame()
{
    return &m_OutData;
}

[Chao_Y_Intel]

Hello,

Thanks for submitting this questions.  As you may you know, the sample code in the IPP is  the legacy one, and users are suggested to move to the Intel® Media SDK  product for some Codec related code.
Do you have a check to the Intel® Media SDK for the AAC encoder?

Thanks,
Chao