void_audio_render.cpp

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/*//////////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2003-2005 Intel Corporation. All Rights Reserved.
//
*/

#include "void_audio_render.h"

UMC::NULLAudioRender::NULLAudioRender(double dfDelay,
                                      UMC_FFMODE_MULTIPLIER mult):
    m_lliFreq(0),
    m_lliLastStartTime(0),
    m_lliPrePauseTime(0),
    m_bPaused(true),
    m_uiFFModeMult(1)
{
    m_lliFreq = vm_time_get_frequency();

    m_dInitialDelay = dfDelay;

    switch(mult)
    {
    case UMC_1X_FFMODE:
        m_uiFFModeMult  = 1;
        break;
    case UMC_2X_FFMODE:
        m_uiFFModeMult  = 2;
        break;
    case UMC_4X_FFMODE:
        m_uiFFModeMult  = 4;
        break;
    case UMC_8X_FFMODE:
        m_uiFFModeMult  = 8;
        break;
    case UMC_16X_FFMODE:
    default:
        m_uiFFModeMult  = 16;
        break;
   }
}

double
UMC::NULLAudioRender::GetTimeTick()
{
    double dfRes = ((m_bPaused) ? (double)(vm_var64s)(m_lliPrePauseTime):
        (double)(vm_var64s)(vm_time_get_tick() -
                    m_lliLastStartTime +
                    m_lliPrePauseTime)) / (vm_var64s)m_lliFreq;

    dfRes += m_dInitialDelay;

    return dfRes * m_uiFFModeMult;
}

UMC::Status
UMC::NULLAudioRender::Init(MediaReceiverParams* pInit)
{
    Status umcRes = UMC_OK;

    umcRes = BasicAudioRender::Init(pInit);


    return umcRes;
}

UMC::Status
UMC::NULLAudioRender::Pause(bool bPause)
{
    if (bPause && !m_bPaused)
    {
        m_lliPrePauseTime += vm_time_get_tick() - m_lliLastStartTime;
        m_bPaused = true;
    }
    else if (!bPause && m_bPaused)
    {
        m_lliLastStartTime = vm_time_get_tick();
        m_bPaused = false;
    }
    return UMC_OK;
}

float
UMC::NULLAudioRender::SetVolume(float /*volume*/)
{   return -1;    }

float
UMC::NULLAudioRender::GetVolume()
{   return -1;    }

UMC::Status
UMC::NULLAudioRender::Close ()
{
    m_lliLastStartTime = 0;
    m_lliPrePauseTime = 0;
    m_bPaused = true;
    return BasicAudioRender::Close();
}

UMC::Status
UMC::NULLAudioRender::Reset ()
{
    m_lliLastStartTime = 0;
    m_lliPrePauseTime = 0;
    m_bPaused = true;

    return BasicAudioRender::Reset();
}

UMC::Status
UMC::NULLAudioRender::SendFrame(MediaData* in)
{
    double dfStart = 0.0;
    double dfEnd = 0.0;
    Status umcRes = UMC_OK;

    if (UMC_OK == umcRes)
    {   umcRes = in->GetTime(dfStart, dfEnd);   }

    //  If we "render" first frame and PTS starts
    if (0 == m_lliLastStartTime && 0 == m_lliPrePauseTime)
    {
        if (0 != dfStart)
        {   m_lliPrePauseTime = (vm_tick)(dfStart * (vm_var64s)m_lliFreq); }
    }

    if (UMC_OK == umcRes)
    {   umcRes = Pause(false);  }

    while (GetTimeTick() < dfEnd - 0.1)
    {   vm_time_sleep(500);    }

    return umcRes;
}

UMC::Status
UMC::NULLAudioRender::SetParams(MediaReceiverParams *pMedia)
{
    UMC::Status umcRes = UMC::UMC_OK;
    AudioRenderParams* pParams =
        DynamicCast<AudioRenderParams, MediaReceiverParams>(pMedia);
    if (NULL == pParams)
    {   umcRes = UMC_NULL_PTR;  }

    return UMC_OK;
}