videoinputpin.cpp

完整的基于Conxant平台的USB电视棒的WIN驱动程序。

/*+++ *******************************************************************\ 
* 
*  Copyright and Disclaimer: 
*  
*     --------------------------------------------------------------- 
*     This software is provided "AS IS" without warranty of any kind, 
*     either expressed or implied, including but not limited to the 
*     implied warranties of noninfringement, merchantability and/or 
*     fitness for a particular purpose.
*     --------------------------------------------------------------- 
*   
*     Copyright (c) 2008 Conexant Systems, Inc. 
*     All rights reserved. 
*
\******************************************************************* ---*/ 

#include "VideoInputPin.h"
#include "VbiPin.h"
#include <ksmedia.h>
#include "CommonGuid.h"


KSPIN_MEDIUM VideoInputPinMedium = {XBAR_VIDEO_OUT_GUID, 0, 0 };




static
NTSTATUS 
process(
    KSPIN *p_ks_pin
    )
{
    // Get the frame buffer via the leading edge STREAM_POINTER
    KSSTREAM_POINTER *p_strm_ptr;
    p_strm_ptr = KsPinGetLeadingEdgeStreamPointer( p_ks_pin, 
                     KSSTREAM_POINTER_STATE_LOCKED );

    if( !p_strm_ptr )
        return STATUS_UNSUCCESSFUL;

    if( p_strm_ptr->StreamHeader )
	{
		if( p_strm_ptr->StreamHeader->FrameExtent !=
			sizeof KS_TVTUNER_CHANGE_INFO )
		{
			KsStreamPointerAdvance( p_strm_ptr );
			return STATUS_UNSUCCESSFUL;
		}
	}
	else
	{
		return STATUS_UNSUCCESSFUL;
	}

    // Get the tv tuner change info out of the frame buffer
    KS_TVTUNER_CHANGE_INFO *p_tv_info = (KS_TVTUNER_CHANGE_INFO*)
        p_strm_ptr->StreamHeader->Data;

    if( !p_tv_info )
	{
		return STATUS_UNSUCCESSFUL;
	}

    
    KSFILTER *p_filt = KsPinGetParentFilter( p_ks_pin );

    if( !p_filt )
	{
		return STATUS_UNSUCCESSFUL;
	}
    if( !p_filt->Descriptor )
	{
		return STATUS_UNSUCCESSFUL;
	}

    VbiPin *p_vbi_pin = NULL;
    ULONG   pin_cnt   = p_filt->Descriptor->PinDescriptorsCount;

    // Find the vbi pin for this filter if one is instantiated
    for( ULONG i = 0; i < pin_cnt; i++ )
    {
		KsFilterAcquireControl( p_filt );
        KSPIN *p_pin = KsFilterGetFirstChildPin( p_filt, i );
		KsFilterReleaseControl( p_filt );

        if( p_pin && 
            IsEqualGUID( *(p_pin->Descriptor->PinDescriptor.Name),
                         PINNAME_VIDEO_VBI ) )
        {
            p_vbi_pin = (VbiPin*)p_pin->Context;
            break;
        }
    }

    // If there isn't a vbi pin instantiated on this filter return
    if( !p_vbi_pin )
    {
        KsStreamPointerAdvance( p_strm_ptr );
        return STATUS_SUCCESS;
    }

    // Pass the tv tuner change info to the VbiPin object
    p_vbi_pin->setTVInfo( p_tv_info );

    KsStreamPointerAdvance( p_strm_ptr );
    return STATUS_SUCCESS;
}


const
KSPIN_DISPATCH
VideoInputPinDispatch = 
{
    NULL,         // Pin Create
    NULL,         // Pin Close
    process,      // Pin Process
    NULL,         // Pin Reset
    NULL,         // Pin Set Data Format
    NULL,         // Pin Set Device State
    NULL,         // Pin Connect
    NULL,         // Pin Disconnect
    NULL,         // Clock Dispatch
    NULL          // Allocator Dispatch
};