filter.cpp

video linux conference

    }

    if( p_connected_pin )
    {
        msg_Dbg( p_input, "CapturePin::Connect [already connected]" );
        return VFW_E_ALREADY_CONNECTED;
    }

    if( !pmt ) return S_OK;
                
    if( GUID_NULL != pmt->majortype &&
        media_types[0].majortype != pmt->majortype )
    {
        msg_Dbg( p_input, "CapturePin::Connect [media major type mismatch]" );
        return S_FALSE;
    }

    if( GUID_NULL != pmt->subtype && !GetFourCCFromMediaType(*pmt) )
    {
        msg_Dbg( p_input, "CapturePin::Connect [media subtype type "
                 "not supported]" );
        return S_FALSE;
    }

    if( pmt->pbFormat && pmt->majortype == MEDIATYPE_Video  )
    {
        if( !((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biHeight ||
            !((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biWidth )
        {
            msg_Dbg( p_input, "CapturePin::Connect "
                     "[video width/height == 0 ]" );
            return S_FALSE;
        }
    }

    msg_Dbg( p_input, "CapturePin::Connect [OK]" );
    return S_OK;
}
STDMETHODIMP CapturePin::ReceiveConnection( IPin * pConnector,
                                            const AM_MEDIA_TYPE *pmt )
{
    if( State_Stopped != p_filter->state )
    {
        msg_Dbg( p_input, "CapturePin::ReceiveConnection [not stopped]" );
        return VFW_E_NOT_STOPPED;
    }

    if( !pConnector || !pmt )
    {
        msg_Dbg( p_input, "CapturePin::ReceiveConnection [null pointer]" );
        return E_POINTER;
    }

    if( p_connected_pin )
    {
        msg_Dbg( p_input, "CapturePin::ReceiveConnection [already connected]");
        return VFW_E_ALREADY_CONNECTED;
    }

    if( S_OK != QueryAccept(pmt) )
    {
        msg_Dbg( p_input, "CapturePin::ReceiveConnection "
                 "[media type not accepted]" );
        return VFW_E_TYPE_NOT_ACCEPTED;
    }

    msg_Dbg( p_input, "CapturePin::ReceiveConnection [OK]" );

    p_connected_pin = pConnector;
    p_connected_pin->AddRef();

    FreeMediaType( cx_media_type );
    return CopyMediaType( &cx_media_type, pmt );
}
STDMETHODIMP CapturePin::Disconnect()
{
    if( ! p_connected_pin )
    {
        msg_Dbg( p_input, "CapturePin::Disconnect [not connected]" );
        return S_FALSE;
    }

    msg_Dbg( p_input, "CapturePin::Disconnect [OK]" );

    /* samples_queue was already flushed in EndFlush() */

    p_connected_pin->Release();
    p_connected_pin = NULL;
    //FreeMediaType( cx_media_type );
    //cx_media_type.subtype = GUID_NULL;

    return S_OK;
}
STDMETHODIMP CapturePin::ConnectedTo( IPin **pPin )
{
    if( !p_connected_pin )
    {
        msg_Dbg( p_input, "CapturePin::ConnectedTo [not connected]" );
        return VFW_E_NOT_CONNECTED;
    }

    p_connected_pin->AddRef();
    *pPin = p_connected_pin;

    msg_Dbg( p_input, "CapturePin::ConnectedTo [OK]" );

    return S_OK;
}
STDMETHODIMP CapturePin::ConnectionMediaType( AM_MEDIA_TYPE *pmt )
{
    if( !p_connected_pin )
    {
        msg_Dbg( p_input, "CapturePin::ConnectionMediaType [not connected]" );
        return VFW_E_NOT_CONNECTED;
    }

    return CopyMediaType( pmt, &cx_media_type );
}
STDMETHODIMP CapturePin::QueryPinInfo( PIN_INFO * pInfo )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::QueryPinInfo" );
#endif

    pInfo->pFilter = p_filter;
    if( p_filter ) p_filter->AddRef();

    memcpy(pInfo->achName, PIN_NAME, sizeof(PIN_NAME));
    pInfo->dir = PINDIR_INPUT;

    return NOERROR;
}
STDMETHODIMP CapturePin::QueryDirection( PIN_DIRECTION * pPinDir )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::QueryDirection" );
#endif

    *pPinDir = PINDIR_INPUT;
    return NOERROR;
}
STDMETHODIMP CapturePin::QueryId( LPWSTR * Id )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::QueryId" );
#endif

    *Id = L"VideoLAN Capture Pin";

    return S_OK;
}
STDMETHODIMP CapturePin::QueryAccept( const AM_MEDIA_TYPE *pmt )
{
    if( State_Stopped != p_filter->state )
    {
        msg_Dbg( p_input, "CapturePin::QueryAccept [not stopped]" );
        return S_FALSE;
    }

    if( media_types[0].majortype != pmt->majortype )
    {
        msg_Dbg( p_input, "CapturePin::QueryAccept [media type mismatch]" );
        return S_FALSE;
    }

    int i_fourcc = GetFourCCFromMediaType(*pmt);
    if( !i_fourcc )
    {   
        msg_Dbg( p_input, "CapturePin::QueryAccept "
                 "[media type not supported]" );
        return S_FALSE;
    }

    if( pmt->majortype == MEDIATYPE_Video )
    {
        if( pmt->pbFormat &&
            ( (((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biHeight == 0) ||
              (((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biWidth == 0) ) )
        {
            msg_Dbg( p_input, "CapturePin::QueryAccept [video size wxh == 0]");
            return S_FALSE;
        }

        msg_Dbg( p_input, "CapturePin::QueryAccept [OK] "
                 "(width=%ld, height=%ld, chroma=%4.4s)",
                 ((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biWidth,
                 ((VIDEOINFOHEADER *)pmt->pbFormat)->bmiHeader.biHeight,
                 (char *)&i_fourcc );
    }
    else if( pmt->majortype == MEDIATYPE_Audio )
    {
        msg_Dbg( p_input, "CapturePin::QueryAccept [OK] (channels=%d, "
                 "samples/sec=%lu, bits/samples=%d, format=%4.4s)",
                 ((WAVEFORMATEX *)pmt->pbFormat)->nChannels,
                 ((WAVEFORMATEX *)pmt->pbFormat)->nSamplesPerSec,
                 ((WAVEFORMATEX *)pmt->pbFormat)->wBitsPerSample,
                 (char *)&i_fourcc );
    }   
    else
    {
        msg_Dbg( p_input, "CapturePin::QueryAccept [OK] (stream format=%4.4s)",
                 (char *)&i_fourcc );
    }

    if( p_connected_pin )
    {
        FreeMediaType( cx_media_type );
        CopyMediaType( &cx_media_type, pmt );
    }

    return S_OK;
}
STDMETHODIMP CapturePin::EnumMediaTypes( IEnumMediaTypes **ppEnum )
{
#ifdef DEBUG_DSHOW_L1
    msg_Dbg( p_input, "CapturePin::EnumMediaTypes" );
#endif

    *ppEnum = new CaptureEnumMediaTypes( p_input, this, NULL );

    if( *ppEnum == NULL ) return E_OUTOFMEMORY;

    return NOERROR;
}
STDMETHODIMP CapturePin::QueryInternalConnections( IPin* *apPin, ULONG *nPin )
{
#ifdef DEBUG_DSHOW_L1
    msg_Dbg( p_input, "CapturePin::QueryInternalConnections" );
#endif
    return E_NOTIMPL;
}
STDMETHODIMP CapturePin::EndOfStream( void )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::EndOfStream" );
#endif
    return S_OK;
}
STDMETHODIMP CapturePin::BeginFlush( void )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::BeginFlush" );
#endif
    return S_OK;
}
STDMETHODIMP CapturePin::EndFlush( void )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::EndFlush" );
#endif

    VLCMediaSample vlc_sample;

    vlc_mutex_lock( &p_sys->lock );
    while( samples_queue.size() )
    {
        vlc_sample = samples_queue.back();
        samples_queue.pop_back();
        vlc_sample.p_sample->Release();
    }
    vlc_mutex_unlock( &p_sys->lock );

    return S_OK;
}
STDMETHODIMP CapturePin::NewSegment( REFERENCE_TIME tStart,
                                     REFERENCE_TIME tStop,
                                     double dRate )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::NewSegment" );
#endif
    return S_OK;
}

/* IMemInputPin methods */
STDMETHODIMP CapturePin::GetAllocator( IMemAllocator **ppAllocator )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::GetAllocator" );
#endif

    return VFW_E_NO_ALLOCATOR;
}
STDMETHODIMP CapturePin::NotifyAllocator( IMemAllocator *pAllocator,
                                          BOOL bReadOnly )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::NotifyAllocator" );
#endif

    return S_OK;
}
STDMETHODIMP CapturePin::GetAllocatorRequirements( ALLOCATOR_PROPERTIES *pProps )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::GetAllocatorRequirements" );
#endif

    return E_NOTIMPL;
}
STDMETHODIMP CapturePin::Receive( IMediaSample *pSample )
{
#if 0 //def DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::Receive" );
#endif

    pSample->AddRef();
    mtime_t i_timestamp = mdate() * 10;
    VLCMediaSample vlc_sample = {pSample, i_timestamp};

    vlc_mutex_lock( &p_sys->lock );
    samples_queue.push_front( vlc_sample );

    /* Make sure we don't cache too many samples */
    if( samples_queue.size() > 10 )
    {
        vlc_sample = samples_queue.back();
        samples_queue.pop_back();
        msg_Dbg( p_input, "CapturePin::Receive trashing late input sample" );
        vlc_sample.p_sample->Release();
    }

    vlc_cond_signal( &p_sys->wait );
    vlc_mutex_unlock( &p_sys->lock );

    return S_OK;
}
STDMETHODIMP CapturePin::ReceiveMultiple( IMediaSample **pSamples,
                                          long nSamples,
                                          long *nSamplesProcessed )
{
    HRESULT hr = S_OK;

    *nSamplesProcessed = 0;
    while( nSamples-- > 0 )
    {
         hr = Receive( pSamples[*nSamplesProcessed] );
         if( hr != S_OK ) break;
         (*nSamplesProcessed)++;
    }
    return hr;
}
STDMETHODIMP CapturePin::ReceiveCanBlock( void )
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CapturePin::ReceiveCanBlock" );
#endif

    return S_FALSE; /* Thou shalt not block */
}

/****************************************************************************
 * Implementation of our dummy directshow filter class
 ****************************************************************************/
CaptureFilter::CaptureFilter( vlc_object_t *_p_input, access_sys_t *p_sys,
                              AM_MEDIA_TYPE *mt, size_t mt_count )
  : p_input( _p_input ),
    p_pin( new CapturePin( _p_input, p_sys, this, mt, mt_count ) ),
    state( State_Stopped ), i_ref( 1 ) 
{
}

CaptureFilter::~CaptureFilter()
{
#ifdef DEBUG_DSHOW
    msg_Dbg( p_input, "CaptureFilter::~CaptureFilter" );
#endif
    p_pin->Release();
}

/* IUnknown methods */
STDMETHODIMP CaptureFilter::QueryInterface( REFIID riid, void **ppv )
{
#ifdef DEBUG_DSHOW_L1
    msg_Dbg( p_input, "CaptureFilter::QueryInterface" );
#endif

    if( riid == IID_IUnknown )
    {
        AddRef();
        *ppv = (IUnknown *)this;
        return NOERROR;
    }
    if( riid == IID_IPersist )
    {
        AddRef();
        *ppv = (IPersist *)this;
        return NOERROR;
    }
    if( riid == IID_IMediaFilter )
    {
        AddRef();
        *ppv = (IMediaFilter *)this;
        return NOERROR;
    }
    if( riid == IID_IBaseFilter )
    {
        AddRef();
        *ppv = (IBaseFilter *)this;
        return NOERROR;
    }
    else
    {
#ifdef DEBUG_DSHOW_L1
        msg_Dbg( p_input, "CaptureFilter::QueryInterface() failed for: "
                 "%04X-%02X-%02X-%02X%02X%02X%02X%02X%02X%02X%02X",
                 (int)riid.Data1, (int)riid.Data2, (int)riid.Data3,
                 static_cast<int>(riid.Data4[0]), (int)riid.Data4[1],
                 (int)riid.Data4[2], (int)riid.Data4[3],
                 (int)riid.Data4[4], (int)riid.Data4[5],
                 (int)riid.Data4[6], (int)riid.Data4[7] );
#endif
        *ppv = NULL;
        return E_NOINTERFACE;
    }
};
STDMETHODIMP_(ULONG) CaptureFilter::AddRef()
{
#ifdef DEBUG_DSHOW_L1
    msg_Dbg( p_input, "CaptureFilter::AddRef (ref: %i)", i_ref );
#endif

    return i_ref++;
};