//------------------------------------------------------------------------------
// File: DynGraph.idl
//
// Desc: Dynamic graph interfaces
//
// Copyright (c) 1999-2002, Microsoft Corporation.  All rights reserved.
//------------------------------------------------------------------------------


interface IPinConnection;
interface IPinFlowControl;
interface IGraphConfig;
interface IGraphConfigCallback;

//--------------------------------------------------------------------
//
//  IPinConnection - supported by input pins
//
//--------------------------------------------------------------------
[
        local,
        object,
        uuid(4a9a62d3-27d4-403d-91e9-89f540e55534),
        pointer_default(unique)
]
interface IPinConnection : IUnknown {

    //  Do you accept this type chane in your current state?
    HRESULT DynamicQueryAccept([in] const AM_MEDIA_TYPE *pmt);

    //  Set event when EndOfStream receive - do NOT pass it on
    //  This condition is cancelled by a flush or Stop
    HRESULT NotifyEndOfStream([in] HANDLE hNotifyEvent);

    //  Are you an 'end pin'
    HRESULT IsEndPin();

    HRESULT DynamicDisconnect();
};

//--------------------------------------------------------------------
//
//  IPinFlowControl - supported by output pins
//
//--------------------------------------------------------------------
[
        local,
        object,
        uuid(c56e9858-dbf3-4f6b-8119-384af2060deb),
        pointer_default(unique)
]
interface IPinFlowControl : IUnknown {
    //  Block processing on this pin
    HRESULT Block([in] DWORD dwBlockFlags, [in] HANDLE hEvent);
}

//  block flags
enum _AM_PIN_FLOW_CONTROL_BLOCK_FLAGS {
    AM_PIN_FLOW_CONTROL_BLOCK = 0x00000001, //  0 means unblock
};


//  Reconnect flags
typedef enum _AM_GRAPH_CONFIG_RECONNECT_FLAGS {
    AM_GRAPH_CONFIG_RECONNECT_DIRECTCONNECT = 0x00000001,
    AM_GRAPH_CONFIG_RECONNECT_CACHE_REMOVED_FILTERS = 0x00000002,
    AM_GRAPH_CONFIG_RECONNECT_USE_ONLY_CACHED_FILTERS = 0x00000004
} AM_GRAPH_CONFIG_RECONNECT_FLAGS;

// RemoveFilterEx flags
enum _REM_FILTER_FLAGS {
    REMFILTERF_LEAVECONNECTED = 0x00000001
};

typedef enum _AM_FILTER_FLAGS {
     AM_FILTER_FLAGS_REMOVABLE = 0x00000001
 } AM_FILTER_FLAGS;


//--------------------------------------------------------------------
//
//  IGraphConfig
//
//--------------------------------------------------------------------

[
        local,
        object,
        uuid(03A1EB8E-32BF-4245-8502-114D08A9CB88),
        pointer_default(unique)
]
interface IGraphConfig : IUnknown {
    HRESULT Reconnect([in] IPin *pOutputPin, 
                      [in] IPin *pInputPin,
                      [in] const AM_MEDIA_TYPE *pmtFirstConnection,
                      [in] IBaseFilter *pUsingFilter, // can be NULL
                      [in] HANDLE hAbortEvent,
                      [in] DWORD dwFlags);

    HRESULT Reconfigure([in] IGraphConfigCallback *pCallback,
                      [in] PVOID pvContext,
                      [in] DWORD dwFlags,
                      [in] HANDLE hAbortEvent);

     
    HRESULT AddFilterToCache([in] IBaseFilter *pFilter);
    HRESULT EnumCacheFilter([out] IEnumFilters **pEnum);
    HRESULT RemoveFilterFromCache([in]IBaseFilter *pFilter);

    //  Get the start time associated with the last Run() call
    //  If the graph is not running returns VFW_E_WRONG_STATE
    HRESULT GetStartTime([out] REFERENCE_TIME *prtStart);

    HRESULT PushThroughData(
        [in] IPin *pOutputPin,
        [in] IPinConnection *pConnection,
        [in] HANDLE hEventAbort);

    HRESULT SetFilterFlags([in] IBaseFilter *pFilter, [in] DWORD dwFlags);
    HRESULT GetFilterFlags([in] IBaseFilter *pFilter, [out] DWORD *pdwFlags);

    HRESULT RemoveFilterEx( [in] IBaseFilter *pFilter, DWORD Flags );
}

//--------------------------------------------------------------------
//
//  IGraphConfigCallback
//
//--------------------------------------------------------------------

[
        local,
        object,
        uuid(ade0fd60-d19d-11d2-abf6-00a0c905f375),
        pointer_default(unique)
]
interface IGraphConfigCallback : IUnknown
{
    HRESULT Reconfigure(PVOID pvContext, DWORD dwFlags);
}

// Filter Chain Definition
// 
//  Filter chains have the following properties:
// 
// - Each filter chain has one or more filters.
// 
// - Each filter in a filter chain has at most one connected input pin and one 
//   connected output pin.  For example, filters A, C, D, F, G, H, I, J and K
//   (see the diagram below) can be in a filter chain because each one has at 
//   most one connected input pin and one connected output pin.
// 
// - Any filter in a chain is reachable by any other filter in the chain.  
//   For example, in the filter chain F-G-H, F can reach H by following the F-
//   G connection to G and then following the G-H connection to H.  Filters F 
//   and J cannot be in the same filter chain because J is not reachable from 
//   F.  Anotherwords, there no sequence of connected filters between F and J.
//
// - The start filter is the only filter in the filter chain who's input 
//   pin is not connected to another filter in the chain.  For instance, F is 
//   the start filter in F-G-H because F's input pin is connected to E and E 
//   is not in the filter chain.  G's input pin is connected to F and H's is 
//   connected to G.  Both F and G are in the filter chain.
//
// - The end filter is the only filter in the filter chain who's output pin 
//   is not connected to another filter in the chain.  For example, in the 
//   filter chain J-K, K is the end filter because K's output pin is 
//   connected to L.  J's output pin is connected to K and K is in the J-K 
//   filter chain.
//
//
//            --->|---|    |---|--->                   
//                | C |--->| D |
// |---|    |---|--->|---|    |---|--->|---|    |---|    |---|    |---|
// | A |--->| B |                      | E |--->| F |--->| G |--->| H |
// |---|    |---|--->|---|------------>|---|    |---|    |---|    |---|
//                   | I |--->
//               --->|---|--->
// 
// |---|    |---|    |---|
// | J |--->| K |--->| L |
// |---|    |---|    |---|
// 
//              Example Filter Graph
// 
// 
// 
// IFilterChain Methods Documentation
// 
// HRESULT StartChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
// 
//      StartChain() switches all the filters in the chain into the running state
// If one of the filters will not switch to the running state, then all the filters 
// in the chain are stopped.  This method can only be called if the filter graph is 
// running.
// 
// Parameters:
// - pStartFilter [in]
//      The first filter in the filter chain.  Note that this can be the same 
// filter as pEndFilter .
// 
// - pEndFilter [in]
//      The last filter in the filter chain.  Note that this can be the same 
// filter as pStartFilter.  If pEndFilter is NULL then the filter chain extends 
// from pStartFilter to the last downstream filter which can be in a filter chain.
// For example, IFilterChain::StartChain( A, NULL ) would start filter A.   
// IFilterChain::StartChain( G, NULL ) would start filters G and H.  
// IFilterChain::StartChain( C, NULL ) would start filters C and D.  Finally, 
// IFilterChain::StartChain( E, NULL ) would fail because E cannot be in a 
// filter chain (see the Filter Chain Definition section for more information).
// 
// Return Value:
//      An HRESULT.  See the Direct Show SDK and COM SDK documentation for more 
// information on interpreting HRESULTs.
// 
// 
// 
// 
// HRESULT PauseChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
// 
//      PauseChain() switches all the filters in a chain to the paused state.  If it cannot
// switch one of the filtres into the paused state, all the filters in the chain are
// stopped.  This method can only be called if the filter graph is paused.
// 
// Parameters:
// - pStartFilter [in]
//      The first filter in the filter chain.  Note that this can be the same 
//  filter as pEndFilter . 
// 
// - pEndFilter [in]
//      The last filter in the filter chain.  Note that this can be the same 
// filter as pStartFilter.  If pEndFilter is NULL then the filter chain extends 
// from pStartFilter to the last downstream filter which can be in a filter chain.
// For example, IFilterChain::StopChain( A, NULL ) would stop filter A.   
// IFilterChain::StopChain( G, NULL ) would stop filters G and H.  
// IFilterChain::StopChain( C, NULL ) would stop filters C and D.  Finally, 
// IFilterChain::StopChain( E, NULL ) would fail because E cannot be in a filter 
// chain (see the Filter Chain Definition section for more information).
// 
// 
// Return Value:
//      An HRESULT.  See the Direct Show SDK and COM SDK documentation for more 
// information on interpreting HRESULTs.
// 
// 
// 
// HRESULT StopChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
// 
//  StopChain() switches all the filters in chain to the stopped state.
// 
// Parameters:
// - pStartFilter [in]
//      The first filter in the filter chain.  Note that this can be the same 
//  filter as pEndFilter . 
// 
// - pEndFilter [in]
//      The last filter in the filter chain.  Note that this can be the same 
// filter as pStartFilter.  If pEndFilter is NULL then the filter chain extends 
// from pStartFilter to the last downstream filter which can be in a filter chain.
// For example, IFilterChain::StopChain( A, NULL ) would stop filter A.   
// IFilterChain::StopChain( G, NULL ) would stop filters G and H.  
// IFilterChain::StopChain( C, NULL ) would stop filters C and D.  Finally, 
// IFilterChain::StopChain( E, NULL ) would fail because E cannot be in a filter 
// chain (see the Filter Chain Definition section for more information).
// 
// 
// Return Value:
//      An HRESULT.  See the Direct Show SDK and COM SDK documentation for more 
// information on interpreting HRESULTs.
// 
// 
// 
// 
// 
// HRESULT RemoveChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
// 
//      RemoveChain() removes every filter in a chain from the filter graph.  
// The filters can be removed while the graph is running.
// 
// Parameters:
// - pStartFilter [in]
//      The first filter in the filter chain.  Note that this can be the same 
// filter as pEndFilter .
// 
// - pEndFilter [in]
//      The last filter in the filter chain.  Note that this can be the same 
// filter as pStartFilter.  If pEndFilter is NULL then the filter chain 
// extends from pStartFilter to the last downstream filter which can be in a 
// filter chain.  For example, IFilterChain::RemoveChain( A, NULL ) would remove 
// filter A from the filter graph.   IFilterChain::RemoveChain( G, NULL ) would 
// remove filters G and H.  IFilterChain::RemoveChain( C, NULL ) would remove 
// filters C and D.  Finally, IFilterChain::RemoveChain( E, NULL ) would fail 
// because E cannot be in a filter chain (see the Filter Chain Definition 
// section for more information).
// 
// 
// Return Value:
//      An HRESULT.  See the Direct Show SDK and COM SDK documentation for more 
// information on interpreting HRESULTs.
// 
// 
[
    local,
    object,
    uuid(DCFBDCF6-0DC2-45f5-9AB2-7C330EA09C29),
    pointer_default(unique)
]
interface IFilterChain : IUnknown
{
    HRESULT StartChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
    HRESULT PauseChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
    HRESULT StopChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
    HRESULT RemoveChain( [in] IBaseFilter *pStartFilter, [in] IBaseFilter *pEndFilter );
}