teletextoutputpin.h

Teletext module usually used in the DVB area.

/* 

(C) Luke Paton 2004.

Copyright notice:

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#pragma once

// UNITS = 10 ^ 7  
// UNITS / 30 = 30 fps;
// UNITS / 20 = 20 fps, etc
const REFERENCE_TIME FPS_30 = UNITS / 30;
const REFERENCE_TIME FPS_20 = UNITS / 20;
const REFERENCE_TIME FPS_10 = UNITS / 10;
const REFERENCE_TIME FPS_5  = UNITS / 5;
const REFERENCE_TIME FPS_4  = UNITS / 4;
const REFERENCE_TIME FPS_3  = UNITS / 3;
const REFERENCE_TIME FPS_2  = UNITS / 2;
const REFERENCE_TIME FPS_1  = UNITS / 1;

class CTeletextOutputPin : public CSourceStream
{
public :
    CTeletextOutputPin
	(
        TCHAR       *pObjectName,
        CBaseFilter *pFilter,
		CCritSec	*pLock,
        HRESULT     *phr,
        LPCWSTR     pName
	);

	~CTeletextOutputPin(void);

    // Attributes
public :
    CCritSec m_cSharedState;            // Protects our internal state

    BITMAPINFO *m_pBmi;                 // Pointer to the bitmap header
    DWORD       m_cbBitmapInfo;         // Size of the bitmap header

	BYTE * m_pImage;                    // Points to pixel bits                                      

    int m_iFrameNumber;
    const REFERENCE_TIME m_rtFrameLength;

    long m_nWidth;
    long m_nHeight;
    HBITMAP m_Bitmap;
    HDC m_DC;
    HGDIOBJ m_OldObject;
	HFONT m_CurrentFont;
	HFONT m_SupplementaryFont;
	HFONT m_OldFont;
	long m_TextMode;
    CAMEvent m_EventDataReady;
	__int64 m_FirstReferenceTimeMilliseconds;

    // Operations
public :
    // Override the version that offers exactly one media type
    HRESULT DecideBufferSize(IMemAllocator *pAlloc, ALLOCATOR_PROPERTIES *pRequest);
    HRESULT FillBuffer(IMediaSample *pSample);
    
    // Set the agreed media type and set up the necessary parameters
    HRESULT SetMediaType(const CMediaType *pMediaType);

    // Support multiple display formats
    HRESULT CheckMediaType(const CMediaType *pMediaType);
    HRESULT GetMediaType(int iPosition, CMediaType *pmt);

    // Quality control
	// Not implemented because we aren't going in real time.
	// If the file-writing filter slows the graph down, we just do nothing, which means
	// wait until we're unblocked. No frames are ever dropped.
    STDMETHODIMP Notify(IBaseFilter* , Quality )
    {
        return E_FAIL;
    }

    HRESULT DoBufferProcessingLoop(void);
};