XAPO中LockForProcess 音频格式设置以及数据处理后的音频格式

MyXAPO   * SubmixMyXAPO=NULL;

XAPO_REGISTRATION_PROPERTIES *ppRegistrationProperties;
 hr=XAudio2CreateReverb(&pXAPO);
 pXAPO->QueryInterface(__uuidof(IXAPO),(void**)&SubmixMyXAPO);
 SubmixMyXAPO->GetRegistrationProperties(&ppRegistrationProperties);
 SubmixMyXAPO->Release();
 SubmixMyXAPO=new MyXAPO(ppRegistrationProperties);

 XAUDIO2_EFFECT_DESCRIPTOR descriptor;
 descriptor.InitialState = true;
 descriptor.OutputChannels = 2;
 descriptor.pEffect = SubmixMyXAPO;
 XAUDIO2_EFFECT_CHAIN chain;
 chain.EffectCount = 1 ;
 chain.pEffectDescriptors = &descriptor;

if(FAILED(hr=pXAudio2->CreateSubmixVoice(&pSubMixVoice2,1,44100,0,7))) //设置通道数（第二个参数）和采样率（第三个参数）
 {
  wprintf( L"Failed creating submix voice: %#X\n", hr );
  SAFE_RELEASE( pXAudio2 );
  CoUninitialize();
  return 0;
 }

hr=pSubMixVoice2->SetEffectChain(&chain);//关联XAPO和SubmixVoice

 const  WAVEFORMATEX* pWFInfo pWFInfo；//是由外部来设置的

 m_pwfxEx.Format.wFormatTag	= WAVE_FORMAT_EXTENSIBLE; //需要注意
 m_pwfxEx.Format.nChannels	= pWFInfo->nChannels;
 m_pwfxEx.Format.cbSize	= 22;
 m_pwfxEx.Format.wBitsPerSample	= 32; //需要注意
 m_pwfxEx.Format.nBlockAlign	= m_pwfxEx.Format.nChannels * (m_pwfxEx.Format.wBitsPerSample/8);
 m_pwfxEx.Format.nSamplesPerSec	= pWFInfo->nSamplesPerSec;
 m_pwfxEx.Format.nAvgBytesPerSec = m_pwfxEx.Format.nSamplesPerSec * m_pwfxEx.Format.nBlockAlign;
 m_pwfxEx.dwChannelMask	= 0; //需要注意
 m_pwfxEx.SubFormat	= KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 m_pwfxEx.Samples.wValidBitsPerSample = m_pwfxEx.Format.wBitsPerSample;