#define EC_OLE_EVENT                        0x18
// ( BSTR, BSTR ) : application
// Sent by a filter to pass a text string to the application.
// Conventionally, the first string is a type, and the second a parameter.


#define EC_NOTIFY_WINDOW                    0x19
// ( HWND, void ) : internal
// Pass the window handle around during pin connection.

#define EC_STREAM_CONTROL_STOPPED           0x1A
// ( IPin * pSender, DWORD dwCookie )
// Notification that an earlier call to IAMStreamControl::StopAt
// has now take effect.  Calls to the method can be marked
// with a cookie which is passed back in the second parameter,
// allowing applications to easily tie together request
// and completion notifications.
//
// NB: IPin will point to the pin that actioned the Stop.  This
// may not be the pin that the StopAt was sent to.

#define EC_STREAM_CONTROL_STARTED           0x1B
// ( IPin * pSender, DWORD dwCookie )
// Notification that an earlier call to IAMStreamControl::StartAt
// has now take effect.  Calls to the method can be marked
// with a cookie which is passed back in the second parameter,
// allowing applications to easily tie together request
// and completion notifications.
//
// NB: IPin will point to the pin that actioned the Start.  This
// may not be the pin that the StartAt was sent to.

#define EC_END_OF_SEGMENT                   0x1C
//
// ( const REFERENCE_TIME *pStreamTimeAtEndOfSegment, DWORD dwSegmentNumber )
//
// pStreamTimeAtEndOfSegment
//     pointer to the accumulated stream clock
//     time since the start of the segment - this is directly computable
//     as the sum of the previous and current segment durations (Stop - Start)
//     and the rate applied to each segment
//     The source add this time to the time within each segment to get
//     a total elapsed time
//
// dwSegmentNumber
//     Segment number - starts at 0
//
// Notifies that a segment end has been reached when the
// AM_SEEKING_Segment flags was set for IMediaSeeking::SetPositions
// Passes in an IMediaSeeking interface to allow the next segment
// to be defined by the application

#define EC_SEGMENT_STARTED                  0x1D
//
// ( const REFERENCE_TIME *pStreamTimeAtStartOfSegment, DWORD dwSegmentNumber)
//
// pStreamTimeAtStartOfSegment
//     pointer to the accumulated stream clock
//     time since the start of the segment - this is directly computable
//     as the sum of the previous segment durations (Stop - Start)
//     and the rate applied to each segment
//
// dwSegmentNumber
//     Segment number - starts at 0
//
// Notifies that a new segment has been started.
// This is sent synchronously by any entity that will issue
// EC_END_OF_SEGMENT when a new segment is started
// (See IMediaSeeking::SetPositions - AM_SEEKING_Segment flag)
// It is used to compute how many EC_END_OF_SEGMENT notifications
// to expect at the end of a segment and as a consitency check


#define EC_LENGTH_CHANGED                  0x1E
// (void, void)
// sent to indicate that the length of the "file" has changed

#define EC_DEVICE_LOST                     0x1f
// (IUnknown, 0)
//
// request window notification when the device is available again
// (through WM_DEVICECHANGED messages registered with
// RegisterDeviceNotification; see IAMDeviceRemoval interface)

#define EC_STEP_COMPLETE                      0x24
// (BOOL bCacelled, void)
// Step request complete
// if bCancelled is TRUE the step was cancelled.  This can happen
// if the application issued some control request or because there
// was a mode change etc etc

// Event code 25 is reserved for future use.

#define EC_TIMECODE_AVAILABLE           0x30
// Sent by filter supporting timecode
// Param1 has a pointer to the sending object
// Param2 has the device ID of the sending object

#define EC_EXTDEVICE_MODE_CHANGE        0x31
// Sent by filter supporting IAMExtDevice
// Param1 has the new mode
// Param2 has the device ID of the sending object

#define EC_STATE_CHANGE                    0x32
// ( FILTER_STATE, BOOL bInternal)
// Used to notify the application of any state changes in the filter graph.
// lParam1  is of type enum FILTER_STATE (defined in strmif.h) and indicates
//          the state of the filter graph.
//
// lParam2 == 0 indicates that the previous state change request has completed
//              & a change in application state.
// lParam2 == 1 reserved for future use to indicate internal state changes.


#define EC_GRAPH_CHANGED                        0x50
// Sent by filter to notify interesting graph changes

#define EC_CLOCK_UNSET                      0x51
// ( void, void ) : application
// Used to notify the filter graph to unset the current graph clock.
// Has the affect of forcing the filter graph to reestablish the graph clock
// on the next Pause/Run (note that this is only used by ksproxy, when the pin
// of a clock providing filter is disconnected)

#define EC_VMR_RENDERDEVICE_SET                 0x53
// (Render_Device type, void)
// Identifies the type of rendering mechanism the VMR
// is using to display video.  Types used include:
#define VMR_RENDER_DEVICE_OVERLAY       0x01
#define VMR_RENDER_DEVICE_VIDMEM        0x02
#define VMR_RENDER_DEVICE_SYSMEM        0x04


#define EC_VMR_SURFACE_FLIPPED          0x54
// (hr - Flip return code, void)
// Identifies the VMR's allocator-presenter has called the DDraw flip api on
// the surface being presented.   This allows the VMR to keep its DX-VA table
// of DDraw surfaces in sync with DDraws flipping chain.

#define EC_VMR_RECONNECTION_FAILED      0x55
// (hr - ReceiveConnection return code, void)
// Identifies that an upstream decoder tried to perform a dynamic format
// change and the VMR was unable to accept the new format.



//------------------------------------------
//
//  BDA events:
//
//      Event code 0x80 through 0x8f are reserved for BDA
//


//------------------------------------------
//
// WindowsMedia SDK filter-specific events:
//
// 
// Note that for EC_WMT_EVENT events the wmsdk-based filters use the following structure for 
// passing event parameters to the app:
#ifndef AM_WMT_EVENT_DATA_DEFINED
#define AM_WMT_EVENT_DATA_DEFINED
typedef struct {
    HRESULT hrStatus;        // status code
    void * pData;            // event data
} AM_WMT_EVENT_DATA;
#endif
//
#define EC_WMT_EVENT_BASE                  0x0251
//
#define EC_WMT_INDEX_EVENT                  EC_WMT_EVENT_BASE
// WindowsMedia SDK-originated file indexing status, sent by WMSDK-based filters
//
// lParam1 is one of the enum WMT_STATUS messages listed below, sent by the WindowsMedia SDK
// lParam2 is specific to the lParam event
//
//     the following WMT_STATUS messages are sent for this event:
//         WMT_STARTED        - lParam2 is 0
//         WMT_CLOSED         - lParam2 is 0
//         WMT_INDEX_PROGRESS - lParam2 is a DWORD containing the progress percent complete
//
#define EC_WMT_EVENT                        EC_WMT_EVENT_BASE+1
// WindowsMedia SDK-originated event, sent by WMSDK-based filters
//
// lParam1 is one of the enum WMT_STATUS messages listed below, sent by the WindowsMedia SDK
// lParam2 is a pointer an AM_WMT_EVENT_DATA structure where,
//                          hrStatus is the status code sent by the wmsdk
//                          pData is specific to the lParam1 event
// 
//     the following WMT_STATUS messages are sent by the WMSDK Reader filter for this event:
//         WMT_NO_RIGHTS        - pData is a pointer to a WCHAR string containing a challenge URL
//         WMT_ACQUIRE_LICENSE  - lParam2 is a pointer to a WM_GET_LICENSE_DATA struct
//         WMT_NO_RIGHTS_EX     - lParam2 is a pointer to a WM_GET_LICENSE_DATA struct
//         WMT_NEEDS_INDIVIDUALIZATION - lParam2 is NULL
//         WMT_INDIVIDUALIZE    - lParam2 is a pointer to a WM_INDIVIDUALIZE_STATUS struct
//
// end WMSDK-originated events
//-----------------------------------------


#define EC_BUILT                            0x300
// Sent to notify transition from unbuilt to built state


#define EC_UNBUILT                          0x301
// Sent to notify transtion from built to unbuilt state