Microsoft虚拟音频设备驱动程序示例(MSVAD)只创建44个字节文件
Microsoft虚拟音频设备驱动程序示例(MSVAD)只创建44个字节文件
提问于 2014-08-25 11:32:25
我目前正在研究MSVAD的简单驱动程序。不幸的是，它的工作方式不像我希望的那样。当一个新程序启动时，它会在C:\下面创建STREAM_NN.WAV
不幸的是，这个文件只有44个字节大小(只包含头)。我附加了调试器视图并获得了以下输出：
MSVAD: [CMiniportWaveCyclic::NewStream]
MSVAD: [CMiniportWaveCyclicMSVAD::ValidateFormat]
MSVAD: [CMiniportWaveCyclic::NewStream]
MSVAD: [CMiniportWaveCyclicMSVAD::ValidateFormat]
MSVAD: CMiniportWaveCyclicMSVAD::ValidatePcm
MSVAD: [CSaveData::InitializeWorkItems]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::Init]
MSVAD: SaveData 845A754C
MSVAD: [CSaveData::SetDataFormat]
MSVAD: [CSaveData::Initialize]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::AllocateBuffer]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetFormat]
MSVAD: [CSaveData::SetDataFormat]
MSVAD: New Format: 44100
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetNotificationFreq]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: KSSTATE_PAUSE
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: KSSTATE_RUN
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=480]
MSVAD: [CSaveData::WriteData ulByteCount=1284]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=628]
MSVAD: [CSaveData::WriteData ulByteCount=1136]
//Truncated for convenience
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=776]
MSVAD: [CSaveData::WriteData ulByteCount=988]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CSaveData::WriteData ulByteCount=1764]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: KSSTATE_PAUSE
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: KSSTATE_STOP
MSVAD: [CSaveData::WaitAllWorkItems]
MSVAD: [CSaveData::SaveFrame]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::SetState]
MSVAD: [CMiniportWaveCyclicStream::~CMiniportWaveCyclicStream]
MSVAD: [CMiniportWaveCyclicStreamMS::~CMiniportWaveCyclicStreamMS]
MSVAD: [CMiniportWaveCyclicStreamMSVAD::FreeBuffer]
MSVAD: [CSaveData::~CSaveData]在我看来，这看起来很直接，例如所有必要的函数都被调用了。我想知道这个例子中是否有已知的bug，还是我必须考虑的任何警告？
操作系统是Windows 7 32位的虚拟机，正常的音频播放就像一种魅力。简单的驱动程序被设置为默认的播放设备。
回答 1
Stack Overflow用户
回答已采纳
发布于 2014-09-06 14:52:43
问题是，由于在方法CSaveData::InitializeWorkItems (savedata.cpp)中添加了DDK 8，因此添加了以下行：
if (m_pWorkItems)
{
return ntStatus;
}但是CSaveData::~CSaveData只释放“工作项”，而不是m_pWorkItems数组。这将导致将来使用释放的“工作项”。
要解决这个问题，您需要替换savedata.cpp，
if (m_pWorkItems)
{
return ntStatus;
}
m_pWorkItems = (PSAVEWORKER_PARAM)
ExAllocatePoolWithTag
(
NonPagedPool,
sizeof(SAVEWORKER_PARAM) * MAX_WORKER_ITEM_COUNT,
MSVAD_POOLTAG
);根据这一守则：
if (!m_pWorkItems)
{
m_pWorkItems = (PSAVEWORKER_PARAM)
ExAllocatePoolWithTag
(
NonPagedPool,
sizeof(SAVEWORKER_PARAM) * MAX_WORKER_ITEM_COUNT,
MSVAD_POOLTAG
);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25484981
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