teletextinputpin.cpp

Teletext module usually used in the DVB area.

// DVBTeletextSubtitles.cpp
/* 

(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.

*/

#include "stdafx.h"
#include "resource.h"
#include "DVBTeletextSubtitles.h"
#include "DVBSubtitlesFilter.h"
#include "DVBTeletextSubtitlesPropertiesPage1.h"
#include <ks.h>
#include <ksmedia.h>
#include <bdatypes.h>
#include <bdamedia.h>

HRESULT
CTeletextPIDInputPin::CheckMediaType(const CMediaType *mtIn)
{
    if (*mtIn->Type() != KSDATAFORMAT_TYPE_MPEG2_SECTIONS)
    {
        return E_INVALIDARG;
    }

	return S_OK;
}

HRESULT
CTeletextPIDInputPin::SetMediaType(const CMediaType* mtIn)
{
    // Set the base class media type (should always succeed)
    HRESULT hr = CBaseInputPin::SetMediaType(mtIn);
    if (FAILED(hr))
	{
        return hr;
    }

    // check the transform can be done (should always succeed)
    ASSERT(SUCCEEDED(CheckMediaType(mtIn)));

    return S_OK;
}

HRESULT CTeletextPIDInputPin::GetMediaType(int iPosition, CMediaType *pMediaType)
{
	if (iPosition == 0)
	{
        pMediaType->InitMediaType();
        pMediaType->SetType(&KSDATAFORMAT_TYPE_MPEG2_SECTIONS);
        pMediaType->SetSubtype(&MEDIASUBTYPE_None);

        return S_OK;
	}

	return VFW_S_NO_MORE_ITEMS;
}

STDMETHODIMP
CTeletextPIDInputPin::EnumMediaTypes( IEnumMediaTypes **ppEnum )
{
    return CBasePin::EnumMediaTypes(ppEnum);

} // EnumMediaTypes

HRESULT
CTeletextPIDInputPin::CompleteConnect(IPin *pReceivePin)
{
	((CDVBTeletextSubtitles*)m_pFilter)->StartFixTeletextInputPinThread();
	return CBaseInputPin::CompleteConnect(pReceivePin);
}

HRESULT
CTeletextPIDInputPin::FixTeletextInputPin(void)
{
	HRESULT hr = E_NOINTERFACE;

	CComPtr<IPin> connected_pin;
    if (SUCCEEDED(ConnectedTo(&connected_pin)))
	{
		CComQIPtr<IMPEG2PIDMap> mpeg2pidmap = connected_pin;
		if (mpeg2pidmap != NULL)
		{
			ULONG pin_pid = ((CDVBTeletextSubtitles*)m_pFilter)->m_nTeletextPid;
			hr = mpeg2pidmap->MapPID(1, &pin_pid, MEDIA_TRANSPORT_PACKET);
		}
	}

	return hr;
}

HRESULT
CTeletextPIDInputPin::Run(REFERENCE_TIME tStart)
{
	((CDVBTeletextSubtitles*)m_pFilter)->StartFixTeletextInputPinThread();
	return CBaseInputPin::Run(tStart);
}


//
// Receive
//
// Here's the next block of data from the stream
//
HRESULT
CTeletextPIDInputPin::Receive(IMediaSample * pSample)
{
    // Lock this with the filter-wide lock
    CAutoLock lock(m_pLock);

    // If we're stopped, then reject this call
    // (the filter graph may be in mid-change)
    if (m_pFilter->IsStopped())
    {
        return E_FAIL;
    }

    // Check all is well with the base class
    HRESULT hr = CBaseInputPin::Receive(pSample);
    if(FAILED(hr))
    {
        return hr;
    }

    // Send the sample to the video window object for rendering

	((CDVBTeletextSubtitles*)m_pFilter)->ReadTeletextTransportStreamSample(pSample);

	return S_OK;
} // Receive