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/*++
Copyright (c) Microsoft Corporation All Rights Reserved
Module Name:
savedata.h
Abstract:
Declaration of Simple Audio Sample data saving class. This class supplies services
to save data to disk.
--*/
#ifndef _SIMPLEAUDIOSAMPLE_SAVEDATA_H
#define _SIMPLEAUDIOSAMPLE_SAVEDATA_H
//-----------------------------------------------------------------------------
// Forward declaration
//-----------------------------------------------------------------------------
class CSaveData;
typedef CSaveData *PCSaveData;
//-----------------------------------------------------------------------------
// Structs
//-----------------------------------------------------------------------------
// Parameter to workitem.
#include <pshpack1.h>
typedef struct _SAVEWORKER_PARAM {
PIO_WORKITEM WorkItem;
ULONG ulFrameNo;
ULONG ulDataSize;
PBYTE pData;
PCSaveData pSaveData;
KEVENT EventDone;
} SAVEWORKER_PARAM;
typedef SAVEWORKER_PARAM *PSAVEWORKER_PARAM;
#include <poppack.h>
// wave file header.
#include <pshpack1.h>
typedef struct _OUTPUT_FILE_HEADER
{
DWORD dwRiff;
DWORD dwFileSize;
DWORD dwWave;
DWORD dwFormat;
DWORD dwFormatLength;
} OUTPUT_FILE_HEADER;
typedef OUTPUT_FILE_HEADER *POUTPUT_FILE_HEADER;
typedef struct _OUTPUT_DATA_HEADER
{
DWORD dwData;
DWORD dwDataLength;
} OUTPUT_DATA_HEADER;
typedef OUTPUT_DATA_HEADER *POUTPUT_DATA_HEADER;
#include <poppack.h>
//-----------------------------------------------------------------------------
// Classes
//-----------------------------------------------------------------------------
///////////////////////////////////////////////////////////////////////////////
// CSaveData
// Saves the wave data to disk.
//
IO_WORKITEM_ROUTINE SaveFrameWorkerCallback;
class CSaveData
{
protected:
UNICODE_STRING m_FileName; // DataFile name.
HANDLE m_FileHandle; // DataFile handle.
PBYTE m_pDataBuffer; // Data buffer.
ULONG m_ulBufferSize; // Total buffer size.
ULONG m_ulFrameIndex; // Current Frame.
ULONG m_ulFrameCount; // Frame count.
ULONG m_ulFrameSize;
ULONG m_ulBufferOffset; // index in buffer.
PBOOL m_fFrameUsed; // Frame usage table.
KSPIN_LOCK m_FrameInUseSpinLock; // Spinlock for synch.
KMUTEX m_FileSync; // Synchronizes file access
OBJECT_ATTRIBUTES m_objectAttributes; // Used for opening file.
OUTPUT_FILE_HEADER m_FileHeader;
PWAVEFORMATEX m_waveFormat;
OUTPUT_DATA_HEADER m_DataHeader;
PLARGE_INTEGER m_pFilePtr;
static PDEVICE_OBJECT m_pDeviceObject;
static ULONG m_ulStreamId;
static PSAVEWORKER_PARAM m_pWorkItems;
BOOL m_fWriteDisabled;
BOOL m_bInitialized;
public:
CSaveData();
~CSaveData();
static NTSTATUS InitializeWorkItems
(
_In_ PDEVICE_OBJECT DeviceObject
);
static void DestroyWorkItems
(
void
);
void Disable
(
_In_ BOOL fDisable
);
static PSAVEWORKER_PARAM GetNewWorkItem
(
void
);
NTSTATUS Initialize
(
);
static NTSTATUS SetDeviceObject
(
_In_ PDEVICE_OBJECT DeviceObject
);
static PDEVICE_OBJECT GetDeviceObject
(
void
);
void ReadData
(
_Inout_updates_bytes_all_(ulByteCount) PBYTE pBuffer,
_In_ ULONG ulByteCount
);
NTSTATUS SetDataFormat
(
_In_ PKSDATAFORMAT pDataFormat
);
NTSTATUS SetMaxWriteSize
(
_In_ ULONG ulMaxWriteSize
);
void WaitAllWorkItems
(
void
);
void WriteData
(
_In_reads_bytes_(ulByteCount) PBYTE pBuffer,
_In_ ULONG ulByteCount
);
private:
NTSTATUS FileClose
(
void
);
NTSTATUS FileOpen
(
_In_ BOOL fOverWrite
);
NTSTATUS FileWrite
(
_In_reads_bytes_(ulDataSize) PBYTE pData,
_In_ ULONG ulDataSize
);
NTSTATUS FileWriteHeader
(
void
);
void SaveFrame
(
_In_ ULONG ulFrameNo,
_In_ ULONG ulDataSize
);
friend
IO_WORKITEM_ROUTINE SaveFrameWorkerCallback;
};
typedef CSaveData *PCSaveData;
#endif
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