Windows-classic-samples/Samples/Win7Samples/multimedia/directshow/dmo/dmodemo/appstream.h

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.

//------------------------------------------------------------------------------
// File: AppStream.h
//
// Desc: DirectShow sample code - header file for CAppStream class.
//------------------------------------------------------------------------------


#ifndef __APPSTREAM_H__
#define __APPSTREAM_H__

#define DEMO_NAME           "DMO Demo\0"

#define SafeGlobalFree(p)    if((p)) { GlobalFree((p));  p = NULL; }

#pragma warning(disable:4100)  // Disable C4100: unreferenced formal parameter

///////////////////////////////////////////////////////////////////////////
// The following definitions come from the Platform SDK and are required if
// the application is being compiled with the headers from Visual C++ 6.0.
///////////////////////////////////////////////////////////////////////////
#ifndef GetWindowLongPtr
  #define GetWindowLongPtrA   GetWindowLongA
  #define GetWindowLongPtrW   GetWindowLongW
  #ifdef UNICODE
    #define GetWindowLongPtr  GetWindowLongPtrW
  #else
    #define GetWindowLongPtr  GetWindowLongPtrA
  #endif // !UNICODE
#endif // !GetWindowLongPtr

#ifndef GWLP_HINSTANCE
  #define GWLP_HINSTANCE      (-6)
#endif
///////////////////////////////////////////////////////////////////////////
// End Platform SDK definitions
///////////////////////////////////////////////////////////////////////////



class CMediaBuffer;

//
// CAppStream - reads audio data out of a WAV file, transforms the data using 
//              a user specified DMO and then returns the data to the user in 
//              a memory buffer
class CAppStream  
{
public:
    CAppStream();
    ~CAppStream();

    HRESULT StreamData( LPTSTR lpszFileInput, 
                        REFGUID rclsid, 
                        HWND hDlg,
                        BYTE **pbOutData, 
                        ULONG *cbDataSize, 
                        LPWAVEFORMATEX *pwfx );

private:
    HRESULT Init(LPTSTR lpszFileInput, REFGUID rclsid, HWND hDlg );
    HRESULT Stream( BYTE **pbOutData, ULONG *cbDataSize, LPWAVEFORMATEX *pwfx );
    HRESULT ProcessOutputs( BYTE **pbOutData);

    IMediaObject        *m_pObject;
    IMediaObjectInPlace *m_pObjectInPlace;
    ULONG               m_uDataSize;    // Size of input data buffer.
    LPWAVEFORMATEX      m_pwfx;         // pointer to input/output waveformatex structure.
    BYTE*               m_pbInData;     // Pointer input data buffer read from wave file.
    DMO_MEDIA_TYPE      m_mt;
};

#pragma warning(disable:4512)   // C4512: assignment operator could not be generated

//  CMediaBuffer object
class CMediaBuffer : public IMediaBuffer
{
public:
    CMediaBuffer(DWORD cbMaxLength) :
        m_cRef(0),
        m_cbMaxLength(cbMaxLength),
        m_cbLength(0),
        m_pbData(NULL)
    {
    }

    ~CMediaBuffer()
    {
        if (m_pbData) {
            delete [] m_pbData;
        }
    }

    STDMETHODIMP QueryInterface(REFIID riid, void **ppv)
    {
        if (ppv == NULL) {
            return E_POINTER;
        }
        if (riid == IID_IMediaBuffer || riid == IID_IUnknown) {
            *ppv = static_cast<IMediaBuffer *>(this);
            AddRef();
            return S_OK;
        }
        *ppv = NULL;
        return E_NOINTERFACE;
    }

    STDMETHODIMP_(ULONG) AddRef()
    {
        return InterlockedIncrement(&m_cRef);
    }

    STDMETHODIMP_(ULONG) Release()
    {
        LONG lRef = InterlockedDecrement(&m_cRef);
        if (lRef == 0) {
            delete this;
        }
        return lRef;
    }

    STDMETHODIMP SetLength(DWORD cbLength)
    {
        if (cbLength > m_cbMaxLength) {
            return E_INVALIDARG;
        } else {
            m_cbLength = cbLength;
            return S_OK;
        }
    }

    STDMETHODIMP GetMaxLength(DWORD *pcbMaxLength)
    {
        if (pcbMaxLength == NULL) {
            return E_POINTER;
        }
        *pcbMaxLength = m_cbMaxLength;
        return S_OK;
    }

    STDMETHODIMP GetBufferAndLength(BYTE **ppbBuffer, DWORD *pcbLength)
    {
        if (ppbBuffer == NULL || pcbLength == NULL) {
            return E_POINTER;
        }
        *ppbBuffer = m_pbData;
        *pcbLength = m_cbLength;
        return S_OK;
    }

    HRESULT Init()
    {
        m_pbData = new BYTE[m_cbMaxLength];
        if (NULL == m_pbData) {
            return E_OUTOFMEMORY;
        } else {
            return S_OK;
        }
    }

    DWORD        m_cbLength;
    const DWORD  m_cbMaxLength;
    LONG         m_cRef;
    BYTE         *m_pbData;
};

#pragma warning(default:4512)   // C4512: assignment operator could not be generated

HRESULT CreateBuffer( DWORD cbMaxLength, CMediaBuffer **ppBuffer );



#endif __APPSTREAM_H__