umc_dv_audio_channel.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 "vm_debug.h"
#include "umc_dv_audio_channel.h"
#include "dv_il_audio.h"


UMC::Status
UMC::DVAudioChannel::ReadFrame(vm_byte* pbBuffer,
                               const vm_var32 uiBufSize,
                               vm_var32& ruiDataRead)
{
    Status umcRes = UMC_OK;
    //    Look for the chunk
    if (UMC_OK == umcRes)
    {    umcRes = FindNextChunk();    }

    //    Read data from file
    vm_byte* pbFrame = NULL;
    vm_var32 uiFrameSize = 0;
//    if (UMC_OK == umcRes)
//    {    umcRes = m_ChunkRdr.MapChunkAndLock(pbFrame, uiFrameSize);    }

    vm_var32 uiAudioDataSize = 0;
    if (UMC_OK == umcRes) {
        vm_var32 uiBitsPerSample;
        bool b625;
        umcRes = NDVAudioIL::GetDVAudioSize(pbFrame, uiFrameSize,
                                        uiAudioDataSize, uiBitsPerSample, b625);
    }

    if (UMC_OK == umcRes && uiBufSize < uiAudioDataSize)
    {    umcRes = UMC_NOT_ENOUGH_BUFFER;    }

    if (UMC_OK == umcRes) {
        umcRes = NDVAudioIL::ExtractDVAudio(pbFrame, uiFrameSize,
                                        pbBuffer, uiBufSize, uiAudioDataSize);
    }

    if (NULL != pbFrame) {
//        Status umcTmp = m_ChunkRdr.MapUnlock();
//        assert(UMC_OK == umcTmp);
    }

    if (UMC_OK == umcRes) {
        umcRes = m_ChunkRdr.Ascend();
        ruiDataRead = uiAudioDataSize;
    }

    if (UMC_OK != umcRes)
    {    vm_debug_trace(4,__VM_STRING("CDVAudioChannel ReadFrame failed\n"));    }

    return umcRes;
}