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//------------------------------------------------------------------------------
// File: AXCore.idl
//
// Desc: Core streaming interfaces. Other ActiveMovie-only interfaces
// are in AXExtend.idl.
//
// Copyright (c) 1992-2002, Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
// include unknwn.idl and objidl.idl first
#define CHARS_IN_GUID 39 // 128 bits, plus { - } punctuation and terminal null
// chars NOT BYTES in the standard representation
// e.g. {D3588AB0-0781-11ce-B03A-0020AF0BA770} + null
cpp_quote("#define CHARS_IN_GUID 39")
//=====================================================================
//=====================================================================
// media types & formats
//=====================================================================
//=====================================================================
// There is a high-level media type (audio, compressed video,
// mpeg video, midi). Within each type, there is a subtype (cinepak, pcm)
// and a length+untyped data block defining the format in a
// type-specific manner. EG for video/cinepak, the data block would be
// a bitmapinfo.
// The contents of the format block are defined by the formattype GUID.
// For example, FORMAT_VideoInfo, FORMAT_WaveFormatEx. In the future, this
// may be a pointer to an object supporting property style interfaces
// in which case the GUID may be something like FORMAT_IUnknown. When
// you are passed a media type you should check the format type, if
// it isn't a type you recognize, then don't touch the format block
typedef struct _AMMediaType {
GUID majortype;
GUID subtype;
BOOL bFixedSizeSamples;
BOOL bTemporalCompression;
ULONG lSampleSize;
GUID formattype;
IUnknown *pUnk;
ULONG cbFormat;
[size_is(cbFormat)] BYTE * pbFormat;
} AM_MEDIA_TYPE;
//=====================================================================
//=====================================================================
// pin information
//=====================================================================
//=====================================================================
// is this an input or output pin
typedef enum _PinDirection {
PINDIR_INPUT,
PINDIR_OUTPUT
} PIN_DIRECTION;
// other types that need defining
#define MAX_PIN_NAME 128
cpp_quote("#define MAX_PIN_NAME 128")
cpp_quote("#define MAX_FILTER_NAME 128")
#define MAX_FILTER_NAME 128
//=====================================================================
//=====================================================================
// time information
//
// This represents a time (either reference or stream) in 100ns units.
// The class library contains a CRefTime helper class
// that supports simple comparison and arithmetic operations
//=====================================================================
//=====================================================================
typedef LONGLONG REFERENCE_TIME;
typedef double REFTIME;
// Win32 HANDLEs have to be cast to these as the MIDL compiler doesn't
// like the HANDLE type or in fact anything remotely associated with
// them. If this ever gets ported to a MAC environment then these will
// have to become an alertable synchronisation object that it supports
typedef DWORD_PTR HSEMAPHORE;
typedef DWORD_PTR HEVENT;
//=====================================================================
//=====================================================================
// Allocator properties
//
// Used to describe the actual properties of an allocator,
// and used to request properties from an allocator or from an upstream
// filter that could create an allocator. See IMemAllocator and
// IMemInputPin.
//=====================================================================
//=====================================================================
typedef struct _AllocatorProperties {
long cBuffers; // count of buffers at this allocator
long cbBuffer; // size of each buffer, excluding any prefix
// alignment of the buffer - buffer start will be aligned on a multiple of
// this amount
long cbAlign;
// prefix amount. Each buffer is immediately preceeded by cbPrefix bytes.
// note that GetPointer points to the beginning of the buffer proper.
// the prefix is aligned, i.e. (GetPointer() - cbPrefix) is aligned on cbAlign.
long cbPrefix;
} ALLOCATOR_PROPERTIES;
// forward declarations (in alphabetical order - we were getting duplicates)
interface IAMovieSetup;
interface IEnumFilters;
interface IEnumMediaTypes;
interface IEnumPins;
interface IBaseFilter;
interface IFilterGraph;
interface IMediaFilter;
interface IMediaSample;
interface IMemAllocator;
interface IMemAllocatorCallbackTemp;
interface IMemAllocatorNotifyCallbackTemp;
interface IMemInputPin;
interface IPin;
interface IReferenceClock;
//=====================================================================
//=====================================================================
// Defines IPin interface
//
// interface representing a single, unidirection connection point on a
// filter. A Pin will connect to exactly one other pin on another filter.
// This interface represents the interface other objects can call on
// this pin. The interface between the filter and the pin is private to
// the implementation of a specific filter.
//
// During the connection process, one pin will be instructed to take
// the lead: the connect interface on this pin will be calling, passing
// the IPin* for the other pin. This connecting pin will call the
// ReceiveConnection member function on the other pin, as well as presumably
// other format-enumeration and queryinterface calls to establish whether
// the connection is possible.
//=====================================================================
//=====================================================================
[
object,
uuid(56a86891-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IPin : IUnknown {
// initiate a connection to another pin. calls ReceiveConnection on the
// other pin. Verifies that the connection is possible and may reject
// it.
// The mediatype parameter is optional. If it is not null, the pin must
// connect using that media type if possible. The subtype and/or format
// type can be GUID_NULL, meaning that the pin can fill them in as desired.
// This allows an application to partially specify the media type to be
// used for the connection, insisting on eg YUV 422 but leaving details
// (such as the image size) to be negotiated between the pins.
HRESULT Connect(
[in] IPin * pReceivePin, // connect yourself to this pin
[in] const AM_MEDIA_TYPE * pmt // (optional) connect using this type
);
// called by a connecting pin to make a connection
HRESULT ReceiveConnection(
[in] IPin * pConnector,
[in] const AM_MEDIA_TYPE *pmt // this is the media type we will exchange
);
// break a connection - no params since there is only one connection
// possible on this pin
HRESULT Disconnect(void);
// Find the pin this pin is connected to (if any)
// The pointer returned is AddRef()d
// Fails if the pin is not connected
HRESULT ConnectedTo(
[out] IPin **pPin
);
// Return the media type of a connection if the pin is connected
HRESULT ConnectionMediaType(
[out] AM_MEDIA_TYPE *pmt
);
// get information about the pin itself
typedef struct _PinInfo {
IBaseFilter *pFilter; // the filter this pin is on
PIN_DIRECTION dir; // am I an input or output pin?
WCHAR achName[MAX_PIN_NAME]; // the name of this pin within this filter
} PIN_INFO;
HRESULT QueryPinInfo(
[out] PIN_INFO * pInfo
);
// We often want to know the direction. Rather than use the
// relatively expensive QueryPinInfo, use this
HRESULT QueryDirection(
[out] PIN_DIRECTION *pPinDir
);
// Get an identifier for the pin (allows connections to be saved).
// The storage will be allocated by the filter using CoTaskMemAlloc
// The caller should free it using CoTaskMemFree
HRESULT QueryId(
[out] LPWSTR * Id
);
// will the pin accept the format type, S_OK yes, S_FALSE no
HRESULT QueryAccept(
[in] const AM_MEDIA_TYPE *pmt
);
// return an enumerator for this pin's preferred media types
HRESULT EnumMediaTypes(
[out] IEnumMediaTypes **ppEnum
);
// return an array of IPin* - the pins that this pin internally connects to
// All pins put in the array must be AddReffed (but no others)
// Errors: "Can't say" - FAIL; not enough slots - return S_FALSE
// Default: return E_NOTIMPL
// The filter graph will interpret E_NOTIMPL as any input pin connects to
// all visible output pins and vise versa.
// apPin can be NULL if nPin==0 (not otherwise).
HRESULT QueryInternalConnections(
[out] IPin* *apPin, // array of IPin*
[in, out] ULONG *nPin // on input, the number of slots
// on output the number of pins
);
// notify the pin that no more data is expected until a new run
// command is issued. End of stream should be queued and delivered after
// all queued data is delivered. Pass through if there is no queued data.
// Flush should flush any queued EOS.
// returns S_OK unless there is some error.
// input pins only: output pins will normally return E_UNEXPECTED.
HRESULT EndOfStream(void);
// Flush
// Enter flush state: do the following steps (in order)
// -- prevent any more Receives succeeding (set a flushing flag)
// -- discard any queued data
// -- free anyone blocked on Receive in your filter
// -- pass BeginFlush to any downstream pins
HRESULT BeginFlush(void);
// End flush state: do the following steps in order
// -- ensure no more data will be pushed by your filter
// (sync with thread if you have one, stop it pushing and
// discard any queued data)
// -- re-enable Receive (clear internal flushing flag)
// -- pass EndFlush to any downstream pins
HRESULT EndFlush(void);
// informational: all data arriving after this call is part of a segment
// from StartTime to StopTime, played at rate. This allows filters that
// process buffers containing more than one sample to clip the rendering
// to within the start and stop times.
//
// A source pin will call a destination pin on this method after completing
// delivery of any previous data, and before any Receive calls for the
// new data
HRESULT NewSegment(
[in] REFERENCE_TIME tStart,
[in] REFERENCE_TIME tStop,
[in] double dRate);
}
typedef IPin *PPIN;
//=====================================================================
//=====================================================================
// Defines IEnumPins interface
//
// interface returned from IBaseFilter::EnumPins(). based on IEnumXXXX
//=====================================================================
//=====================================================================
[
object,
uuid(56a86892-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IEnumPins : IUnknown {
HRESULT Next(
[in] ULONG cPins, // place this many pins...
[out, size_is(cPins)] IPin ** ppPins, // ...in this array
[out] ULONG * pcFetched // actual count passed
);
HRESULT Skip(
[in] ULONG cPins);
HRESULT Reset(void);
HRESULT Clone(
[out] IEnumPins **ppEnum
);
}
typedef IEnumPins *PENUMPINS;
//=====================================================================
//=====================================================================
// Defines IEnumMediaTypes interface
//
// Enumerates the preferred formats for a pin
//=====================================================================
//=====================================================================
[
object,
uuid(89c31040-846b-11ce-97d3-00aa0055595a),
pointer_default(unique)
]
interface IEnumMediaTypes : IUnknown {
// to call this member function pass in the address of a pointer to a
// media type. The interface will allocate the necessary AM_MEDIA_TYPE
// structures and initialise them with the variable format block
HRESULT Next(
[in] ULONG cMediaTypes, // place this many types...
[out, size_is(cMediaTypes)]
AM_MEDIA_TYPE ** ppMediaTypes, // ...in this array
[out] ULONG * pcFetched // actual count passed
);
HRESULT Skip(
[in] ULONG cMediaTypes);
HRESULT Reset(void);
HRESULT Clone(
[out] IEnumMediaTypes **ppEnum
);
}
typedef IEnumMediaTypes *PENUMMEDIATYPES;
//========================================================================
//========================================================================
// Defines IFilterGraph interface
//
// abstraction representing a graph of filters
// This allows filters to be joined into a graph and operated as a unit.
//========================================================================
//========================================================================
[
object,
uuid(56a8689f-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IFilterGraph : IUnknown {
//==========================================================================
// Low level filter functions
//==========================================================================
// Add a filter to the graph and name it with *pName.
// If the name is not unique, The request will fail.
// The Filter graph will call the JoinFilterGraph
// member function of the filter to inform it.
// This must be called before attempting Connect, ConnectDirect or Render
// for pins of the filter.
HRESULT AddFilter
( [in] IBaseFilter * pFilter,
[in, string] LPCWSTR pName
);
// Remove a filter from the graph. The filter graph implementation
// will inform the filter that it is being removed.
HRESULT RemoveFilter
( [in] IBaseFilter * pFilter
);
// Set *ppEnum to be an enumerator for all filters in the graph.
HRESULT EnumFilters
( [out] IEnumFilters **ppEnum
);
// Set *ppFilter to be the filter which was added with the name *pName
// Will fail and set *ppFilter to NULL if the name is not in this graph.
HRESULT FindFilterByName
( [in, string] LPCWSTR pName,
[out] IBaseFilter ** ppFilter
);
//==========================================================================
// Low level connection functions
//==========================================================================
// Connect these two pins directly (i.e. without intervening filters)
// the media type is optional, and may be partially specified (that is
// the subtype and/or format type may be GUID_NULL). See IPin::Connect
// for details of the media type parameter.
HRESULT ConnectDirect
( [in] IPin * ppinOut, // the output pin
[in] IPin * ppinIn, // the input pin
[in, unique] const AM_MEDIA_TYPE* pmt // optional mediatype
);
// Break the connection that this pin has and reconnect it to the
// same other pin.
HRESULT Reconnect
( [in] IPin * ppin // the pin to disconnect and reconnect
);
// Disconnect this pin, if connected. Successful no-op if not connected.
HRESULT Disconnect
( [in] IPin * ppin
);
//==========================================================================
// intelligent connectivity - now in IGraphBuilder, axextend.idl
//==========================================================================
//==========================================================================
// Whole graph functions
//==========================================================================
// Once a graph is built, it can behave as a (composite) filter.
// To control this filter, QueryInterface for IMediaFilter.
// The filtergraph will by default ensure that the graph has a sync source
// when it is made to Run. SetSyncSource(NULL) will prevent that and allow
// all the filters to run unsynchronised until further notice.
// SetDefaultSyncSource will set the default sync source (the same as would
// have been set by default on the first call to Run).
HRESULT SetDefaultSyncSource(void);
}
typedef IFilterGraph *PFILTERGRAPH;
//==========================================================================
//==========================================================================
// Defines IEnumFilters interface
//
// enumerator interface returned from IFilterGraph::EnumFilters().
// based on IEnum pseudo-template
//==========================================================================
//==========================================================================
[
object,
uuid(56a86893-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IEnumFilters : IUnknown {
HRESULT Next
( [in] ULONG cFilters, // place this many filters...
[out] IBaseFilter ** ppFilter, // ...in this array of IBaseFilter*
[out] ULONG * pcFetched // actual count passed returned here
);
HRESULT Skip
( [in] ULONG cFilters
);
HRESULT Reset(void);
HRESULT Clone
( [out] IEnumFilters **ppEnum
);
}
typedef IEnumFilters *PENUMFILTERS;
//=====================================================================
//=====================================================================
// Defines IMediaFilter interface
//
// multimedia components that provide time-based data will expose this.
// this interface abstracts an object that processes time-based data streams
// and represents a multimedia device (possibly implemented in software).
// it controls the active/running state of the object and its synchronization
// to other objects in the system.
//
// derived from IPersist so that all filter-type objects in a graph
// can have their class id serialised.
//=====================================================================
//=====================================================================
[
object,
uuid(56a86899-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IMediaFilter : IPersist {
// tell the filter to transition to the new state. The state transition
// may not be instantaneous (external mechanical activity may be involved,
// for example). The state functions may return before the state
// transition has completed
// these functions will return S_OK if the transition is complete, S_FALSE if
// the transition is not complete but no error has occurred, or some error value
// if the transition failed.
HRESULT Stop(void);
HRESULT Pause(void);
// in order to synchronise independent streams, you must pass a time
// value with the Run command. This is the difference between stream
// time and reference time. That is, it is the amount to be added to
// the IMediaSample timestamp to get the time at which that sample
// should be rendered according to the reference clock.
// If we are starting at the beginning of the stream, it will thus be
// simply the time at which the first sample should appear. If we are
// restarting from Paused mode in midstream, then it will be the total
// time we have been paused added to the initial start time.
// the filtergraph will provide this information to its filters. If you
// are an app calling the filtergraph, it's ok to pass a start time of
// 0, in which case the filter graph will calculate a soon-as-possible
// time. FilterGraphs will accept 0 meaning ASAP; most filters will not.
HRESULT Run(REFERENCE_TIME tStart);
// possible states that the filter could be in
typedef enum _FilterState {
State_Stopped, // not in use
State_Paused, // holding resources, ready to go
State_Running // actively processing media stream
} FILTER_STATE;
// find out what state the filter is in.
// If timeout is 0, will return immediately - if a state transition is
// not complete, it will return the state being transitioned into, and
// the return code will be VFW_S_STATE_INTERMEDIATE. if no state
// transition is in progress the state will be returned and the return
// code will be S_OK.
//
// If timeout is non-zero, GetState will not return until the state
// transition is complete, or the timeout expires.
// The timeout is in milliseconds.
// You can also pass in INFINITE as a special value for the timeout, in
// which case it will block indefinitely waiting for the state transition
// to complete. If the timeout expires, the state returned is the
// state we are trying to reach, and the return code will be
// VFW_S_STATE_INTERMEDIATE. If no state transition is in progress
// the routine returns immediately with return code S_OK.
//
// return State is State_Running, State_Paused or State_Stopped.
// return code is S_OK, or VFW_S_STATE_INTERMEDIATE if state
// transition is not complete or an error value if the method failed.
HRESULT GetState(
[in] DWORD dwMilliSecsTimeout,
[out] FILTER_STATE *State);
// tell the filter the reference clock to which it should synchronize
// activity. This is most important to rendering filters and may not
// be of any interest to other filters.
HRESULT SetSyncSource(
[in] IReferenceClock * pClock);
// get the reference clock currently in use (it may be NULL)
HRESULT GetSyncSource(
[out] IReferenceClock ** pClock);
}
typedef IMediaFilter *PMEDIAFILTER;
//=====================================================================
//=====================================================================
// Defines IBaseFilter interface
//
// all multimedia components will expose this interface
// this interface abstracts an object that has typed input and output
// connections and can be dynamically aggregated.
//
// IMediaFilter supports synchronisation and activity state: IBaseFilter
// is derived from that since all filters need to support IMediaFilter,
// whereas a few objects (plug-in control distributors for example) will
// support IMediaFilter but not IBaseFilter.
//
// IMediaFilter is itself derived from IPersist so that every filter
//supports GetClassID()
//=====================================================================
//=====================================================================
[
object,
uuid(56a86895-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IBaseFilter : IMediaFilter {
// enumerate all the pins available on this filter
// allows enumeration of all pins only.
//
HRESULT EnumPins(
[out] IEnumPins ** ppEnum // enum interface returned here
);
// Convert the external identifier of a pin to an IPin *
// This pin id is quite different from the pin Name in CreatePin.
// In CreatePin the Name is invented by the caller. In FindPin the Id
// must have come from a previous call to IPin::QueryId. Whether or not
// this operation would cause a pin to be created depends on the filter
// design, but if called twice with the same id it should certainly
// return the same pin both times.
HRESULT FindPin(
[in, string] LPCWSTR Id,
[out] IPin ** ppPin
);
// find out information about this filter
typedef struct _FilterInfo {
WCHAR achName[MAX_FILTER_NAME]; // maybe null if not part of graph
IFilterGraph * pGraph; // null if not part of graph
} FILTER_INFO;
HRESULT QueryFilterInfo(
[out] FILTER_INFO * pInfo
);
// notify a filter that it has joined a filter graph. It is permitted to
// refuse. The filter should addref and store this interface for later use
// since it may need to notify events to this interface. A null pointer indicates
// that the filter is no longer part of a graph.
HRESULT JoinFilterGraph(
[in] IFilterGraph * pGraph,
[in, string] LPCWSTR pName
);
// return a Vendor information string. Optional - may return E_NOTIMPL.
// memory returned should be freed using CoTaskMemFree
HRESULT QueryVendorInfo(
[out, string] LPWSTR* pVendorInfo
);
}
typedef IBaseFilter *PFILTER;
//=====================================================================
//=====================================================================
// sync and state management
//=====================================================================
//=====================================================================
//=====================================================================
//=====================================================================
// Defines IReferenceClock interface
//=====================================================================
//=====================================================================
[
object,
uuid(56a86897-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IReferenceClock : IUnknown {
// get the time now
HRESULT GetTime(
[out] REFERENCE_TIME *pTime
);
// ask for an async notification that a time has elapsed
HRESULT AdviseTime(
[in] REFERENCE_TIME baseTime, // base reference time
[in] REFERENCE_TIME streamTime, // stream offset time
[in] HEVENT hEvent, // advise via this event
[out] DWORD_PTR * pdwAdviseCookie // where your cookie goes
);
// ask for an async periodic notification that a time has elapsed
HRESULT AdvisePeriodic(
[in] REFERENCE_TIME startTime, // starting at this time
[in] REFERENCE_TIME periodTime, // time between notifications
[in] HSEMAPHORE hSemaphore, // advise via a semaphore
[out] DWORD_PTR * pdwAdviseCookie // where your cookie goes
);
// cancel a request for notification
HRESULT Unadvise(
[in] DWORD_PTR dwAdviseCookie);
}
typedef IReferenceClock *PREFERENCECLOCK;
//=====================================================================
//=====================================================================
// Defines IReferenceClock2 interface
//=====================================================================
//=====================================================================
[
object,
uuid(36b73885-c2c8-11cf-8b46-00805f6cef60),
pointer_default(unique)
]
interface IReferenceClock2 : IReferenceClock {
}
typedef IReferenceClock2 *PREFERENCECLOCK2;
//=====================================================================
//=====================================================================
// Data transport interfaces
//=====================================================================
//=====================================================================
//=====================================================================
//=====================================================================
// Defines IMediaSample interface
//=====================================================================
//=====================================================================
[
local,
object,
uuid(56a8689a-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IMediaSample : IUnknown {
// get me a read/write pointer to this buffer's memory. I will actually
// want to use sizeUsed bytes.
HRESULT GetPointer([out] BYTE ** ppBuffer);
// return the size in bytes of the buffer data area
long GetSize(void);
// get the stream time at which this sample should start and finish.
HRESULT GetTime(
[out] REFERENCE_TIME * pTimeStart, // put time here
[out] REFERENCE_TIME * pTimeEnd
);
// Set the stream time at which this sample should start and finish.
// pTimeStart==pTimeEnd==NULL will invalidate the time stamps in
// this sample
HRESULT SetTime(
[in] REFERENCE_TIME * pTimeStart, // put time here
[in] REFERENCE_TIME * pTimeEnd
);
// sync-point property. If true, then the beginning of this
// sample is a sync-point. (note that if AM_MEDIA_TYPE.bTemporalCompression
// is false then all samples are sync points). A filter can start
// a stream at any sync point. S_FALSE if not sync-point, S_OK if true.
HRESULT IsSyncPoint(void);
HRESULT SetSyncPoint(BOOL bIsSyncPoint);
// preroll property. If true, this sample is for preroll only and
// shouldn't be displayed.
HRESULT IsPreroll(void);
HRESULT SetPreroll(BOOL bIsPreroll);
long GetActualDataLength(void);
HRESULT SetActualDataLength(long);
// these allow for limited format changes in band - if no format change
// has been made when you receive a sample GetMediaType will return S_FALSE
HRESULT GetMediaType(AM_MEDIA_TYPE **ppMediaType);
HRESULT SetMediaType(AM_MEDIA_TYPE *pMediaType);
// returns S_OK if there is a discontinuity in the data (this frame is
// not a continuation of the previous stream of data
// - there has been a seek or some dropped samples).
HRESULT IsDiscontinuity(void);
// set the discontinuity property - TRUE if this sample is not a
// continuation, but a new sample after a seek or a dropped sample.
HRESULT SetDiscontinuity(BOOL bDiscontinuity);
// get the media times for this sample
HRESULT GetMediaTime(
[out] LONGLONG * pTimeStart,
[out] LONGLONG * pTimeEnd
);
// Set the media times for this sample
// pTimeStart==pTimeEnd==NULL will invalidate the media time stamps in
// this sample
HRESULT SetMediaTime(
[in] LONGLONG * pTimeStart,
[in] LONGLONG * pTimeEnd
);
}
typedef IMediaSample *PMEDIASAMPLE;
// Values for dwFlags for AM_SAMPLE_PROPERTIES
enum tagAM_SAMPLE_PROPERTY_FLAGS
{ AM_SAMPLE_SPLICEPOINT = 0x01, /* Is this a splice point
IE can it be decoded
without reference to
previous data */
AM_SAMPLE_PREROLL = 0x02, /* Is this a preroll sample */
AM_SAMPLE_DATADISCONTINUITY = 0x04, /* Set if start of new segment */
AM_SAMPLE_TYPECHANGED = 0x08, /* Has the type changed */
AM_SAMPLE_TIMEVALID = 0x10, /* Set if time is valid */
AM_SAMPLE_TIMEDISCONTINUITY = 0x40, /* time gap in data starts after
this sample - pbBuffer can
be NULL
*/
AM_SAMPLE_FLUSH_ON_PAUSE = 0x80, /* For live data - discard
in paused state
*/
AM_SAMPLE_STOPVALID = 0x100, /* Stop time is valid */
AM_SAMPLE_ENDOFSTREAM = 0x200, /* End of stream after
this data
This is reserved for
kernel streaming and is
not currently used by
ActiveMovie
*/
AM_STREAM_MEDIA = 0, /* Normal data stream id */
AM_STREAM_CONTROL = 1 /* Control stream id */
/* > 7FFFFFFF is application
defined stream
*/
};
// Media sample generic properties structure
typedef struct tagAM_SAMPLE2_PROPERTIES {
DWORD cbData; // Length of generic data for extensiblity
// Number of bytes INCLUDING this field
DWORD dwTypeSpecificFlags; // Type specific flag data
DWORD dwSampleFlags; // Flags bits defined by AM_SAMPLE_xxx flags
// All undefined bits RESERVED (set to 0,
// leave on copy)
LONG lActual; // Length of data in buffer
REFERENCE_TIME tStart; // Start time if valid
REFERENCE_TIME tStop; // Stop time if valid
DWORD dwStreamId; // Stream 0 is normal media transport
// Stream 1 is control
AM_MEDIA_TYPE *pMediaType; // Copy of media type - INVALID after Release()
BYTE *pbBuffer; // Pointer to buffer - INVALID after Release()
LONG cbBuffer; // Length of buffer
} AM_SAMPLE2_PROPERTIES;
//=====================================================================
//=====================================================================
// Defines IMediaSample2 interface
//=====================================================================
//=====================================================================
[
local,
object,
uuid(36b73884-c2c8-11cf-8b46-00805f6cef60),
pointer_default(unique)
]
interface IMediaSample2 : IMediaSample {
// Get sample properties
//
// cbProperties - length of generic data to retrieve
// pbProperties - pointer to generic data buffer - can
// be NULL if cbProperties is NULL
// data conforms to AM_SAMPLE_PROPERTIES
//
HRESULT GetProperties(
[in] DWORD cbProperties,
[out, size_is(cbProperties)] BYTE * pbProperties
);
// Set sample properties
//
// cbProperties - length of generic data to set
// pbProperties - pointer to generic data buffer - can
// be NULL if cbProperties is NULL
// data conforms to AM_SAMPLE_PROPERTIES
//
//
HRESULT SetProperties(
[in] DWORD cbProperties,
[in, size_is(cbProperties)] const BYTE * pbProperties
);
// // Get the clock associated with the sample
// HRESULT GetClock(
// [out] IReferenceClock2 **ppClock
// );
// // Get a pointer to the object containing the data
// //
// // riid - IID of interface required on object
// // ppvobject - Pointer to object containing the data
// //
// // Returns
// // S_OK - Got the object
// // E_NOINTERFACE - object does not support this interface
// // if IUnknown is not supported
// // there is no backing object
// // E_NOTIMPL - samples don't have backing objects
// //
// //
// HRESULT GetBackingObject(
// [in] REFIID riid,
// [out] void **ppvObject
// );
}
typedef IMediaSample2 *PMEDIASAMPLE2;
// flags for dwFlags in IMemAllocator::GetBuffer
// AM_GBF_PREVFRAMESKIPPED is only significant when asking for a buffer from the
// video renderer. It should be TRUE if and only if the previous frame
// was skipped. It affects quality management.
// AM_GBF_NOTASYNCPOINT indicates to the downstream filter (most likely the
// video renderer) that you are not going to fill this buffer with a sync point
// (keyframe) so now would be a bad time to return a buffer with a dynamic
// format change, because you will be unable to switch to the new format without
// waiting for the next sync point, causing some frames to be dropped.
#define AM_GBF_PREVFRAMESKIPPED 1
#define AM_GBF_NOTASYNCPOINT 2
cpp_quote("#define AM_GBF_PREVFRAMESKIPPED 1")
cpp_quote("#define AM_GBF_NOTASYNCPOINT 2")
// This may not be supported by allocators
cpp_quote("#define AM_GBF_NOWAIT 4")
// This flag is supported by the VMR's surface allocator
// When set the DDraw surface used for the media sample
// is returned is an un-locked state. Calls the GetPointer on
// the returned media sample will fail and return a NULL pointer
//
cpp_quote("#define AM_GBF_NODDSURFACELOCK 8")
//=====================================================================
//=====================================================================
// Defines IMemAllocator interface
//
// an allocator of IMediaSample blocks to be used for data transfer between
// pins. Can be provided by input, output or a third party. Release
// the IMediaSample object obtained back to the pool by calling
// IMediaSample::Release.
//=====================================================================
//=====================================================================
[
object,
uuid(56a8689c-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IMemAllocator : IUnknown {
// negotiate buffer sizes, buffer count and alignment. pRequest is filled
// in by the caller with the requested values. pActual will be returned
// by the allocator with the closest that the allocator can come to this.
// Cannot be called unless the allocator is decommitted.
// Calls to GetBuffer need not succeed until Commit is called.
HRESULT SetProperties(
[in] ALLOCATOR_PROPERTIES* pRequest,
[out] ALLOCATOR_PROPERTIES* pActual);
// return the properties actually being used on this allocator
HRESULT GetProperties(
[out] ALLOCATOR_PROPERTIES* pProps);
// commit the memory for the agreed buffers
HRESULT Commit(void);
// release the memory for the agreed buffers. Any threads waiting in
// GetBuffer will return with an error. GetBuffer calls will always fail
// if called before Commit or after Decommit.
HRESULT Decommit(void);
// get container for a sample. Blocking, synchronous call to get the
// next free buffer (as represented by an IMediaSample interface).
// on return, the time etc properties will be invalid, but the buffer
// pointer and size will be correct.
// Will only succeed if memory is committed. If GetBuffer is blocked
// waiting for a buffer and Decommit is called on another thread,
// GetBuffer will return with an error.
HRESULT GetBuffer(
[out] IMediaSample **ppBuffer,
[in] REFERENCE_TIME * pStartTime,
[in] REFERENCE_TIME * pEndTime,
[in] DWORD dwFlags
);
// put a buffer back on the allocators free list.
// this is typically called by the Release() method of the media
// sample when the reference count goes to 0
//
HRESULT ReleaseBuffer(
[in] IMediaSample *pBuffer
);
}
typedef IMemAllocator *PMEMALLOCATOR;
//=====================================================================
//=====================================================================
// Defines IMemAllocatorCallbackTemp interface
//
// If the allocator supports IMemAllocator2 then callbacks are
// available
//
//=====================================================================
//=====================================================================
[
object,
uuid(379a0cf0-c1de-11d2-abf5-00a0c905f375),
pointer_default(unique)
]
interface IMemAllocatorCallbackTemp : IMemAllocator {
// Set notification interface. pNotify can be NULL
HRESULT SetNotify(
[in] IMemAllocatorNotifyCallbackTemp *pNotify);
// Get current stats
HRESULT GetFreeCount(
[out] LONG *plBuffersFree);
}
//=====================================================================
//=====================================================================
// Defines IMemAllocatorNotify interface
//
//=====================================================================
//=====================================================================
[
object,
uuid(92980b30-c1de-11d2-abf5-00a0c905f375),
pointer_default(unique)
]
interface IMemAllocatorNotifyCallbackTemp : IUnknown {
// Called whenever ReleaseBuffer is called in the allocator
// Note the caller may have acquired locks and this call may
// occur in any context so generally the implementor of this
// call will just set an event or post a message for another
// thread to take action.
HRESULT NotifyRelease();
}
//=====================================================================
//=====================================================================
// Defines IMemInputPin interface
//
// basic shared memory transport interface.
//=====================================================================
//=====================================================================
[
object,
uuid(56a8689d-0ad4-11ce-b03a-0020af0ba770),
pointer_default(unique)
]
interface IMemInputPin : IUnknown {
// return the allocator interface that this input pin
// would like the output pin to use
HRESULT GetAllocator(
[out] IMemAllocator ** ppAllocator);
// tell the input pin which allocator the output pin is actually
// going to use.
// If the readonly flag is set, then all samples from this allocator are
// to be treated as read-only, and should be copied before being modified.
HRESULT NotifyAllocator(
[in] IMemAllocator * pAllocator,
[in] BOOL bReadOnly
);
// this method is optional (can return E_NOTIMPL). Output pins are not obliged to call
// this method, nor are they obliged to fulfil the request. Input pins making such a
// request should check the allocator in NotifyAllocator to see if it meets their needs. If
// not, the input pin is responsible for any necessary data copy.
// Zero values will be treated as don't care: so a pin can return an alignment value
// and leave the other values 0.
HRESULT GetAllocatorRequirements( [out] ALLOCATOR_PROPERTIES*pProps);
// here's the next block of data from the stream. AddRef it if
// you need to hold it beyond the end of the Receive call.
// call pSample->Release when done with it.
//
// This is a blocking synchronous call. Usually no blocking
// will occur but if a filter cannot process the sample immediately
// it may use the caller's thread to wait until it can.
HRESULT Receive(
[in] IMediaSample * pSample);
// Same as Receive but with multiple samples. Useful for
// fragmented streams
HRESULT ReceiveMultiple(
[in, size_is(nSamples)] IMediaSample **pSamples,
[in] long nSamples,
[out] long *nSamplesProcessed);
// See if Receive might block
// Returns S_OK if it can block, S_FALSE if it can't or some
// failure code (assume it can in this case)
HRESULT ReceiveCanBlock();
}
typedef IMemInputPin *PMEMINPUTPIN;
//=====================================================================
//=====================================================================
// Defines IAMovieSetup interface
//
// exported by filter to allow it to be self-registering
//=====================================================================
//=====================================================================
[
object,
uuid(a3d8cec0-7e5a-11cf-bbc5-00805f6cef20),
pointer_default(unique)
]
interface IAMovieSetup : IUnknown {
// methods to register and unregister filter, etc.
HRESULT Register( );
HRESULT Unregister( );
}
typedef IAMovieSetup *PAMOVIESETUP;
//=====================================================================
//=====================================================================
// Defines IMediaSeeking interface
//
// Controls seeking (time, bytes, frames, fields and samples)
//=====================================================================
//=====================================================================
typedef enum AM_SEEKING_SeekingFlags
{
AM_SEEKING_NoPositioning = 0x00, // No change
AM_SEEKING_AbsolutePositioning = 0x01, // Position is supplied and is absolute
AM_SEEKING_RelativePositioning = 0x02, // Position is supplied and is relative
AM_SEEKING_IncrementalPositioning = 0x03, // (Stop) position relative to current
// Useful for seeking when paused (use +1)
AM_SEEKING_PositioningBitsMask = 0x03, // Useful mask
AM_SEEKING_SeekToKeyFrame = 0x04, // Just seek to key frame (performance gain)
AM_SEEKING_ReturnTime = 0x08, // Plug the media time equivalents back into the supplied LONGLONGs
AM_SEEKING_Segment = 0x10, // At end just do EC_ENDOFSEGMENT,
// don't do EndOfStream
AM_SEEKING_NoFlush = 0x20 // Don't flush
} AM_SEEKING_SEEKING_FLAGS;
typedef enum AM_SEEKING_SeekingCapabilities
{
AM_SEEKING_CanSeekAbsolute = 0x001,
AM_SEEKING_CanSeekForwards = 0x002,
AM_SEEKING_CanSeekBackwards = 0x004,
AM_SEEKING_CanGetCurrentPos = 0x008,
AM_SEEKING_CanGetStopPos = 0x010,
AM_SEEKING_CanGetDuration = 0x020,
AM_SEEKING_CanPlayBackwards = 0x040,
AM_SEEKING_CanDoSegments = 0x080,
AM_SEEKING_Source = 0x100 // Doesn't pass thru used to
// count segment ends
} AM_SEEKING_SEEKING_CAPABILITIES;
[
object,
uuid(36b73880-c2c8-11cf-8b46-00805f6cef60),
pointer_default(unique)
]
interface IMediaSeeking : IUnknown {
// Returns the capability flags
HRESULT GetCapabilities( [out] DWORD * pCapabilities );
// And's the capabilities flag with the capabilities requested.
// Returns S_OK if all are present, S_FALSE if some are present, E_FAIL if none.
// *pCababilities is always updated with the result of the 'and'ing and can be
// checked in the case of an S_FALSE return code.
HRESULT CheckCapabilities( [in,out] DWORD * pCapabilities );
// returns S_OK if mode is supported, S_FALSE otherwise
HRESULT IsFormatSupported([in] const GUID * pFormat);
HRESULT QueryPreferredFormat([out] GUID * pFormat);
HRESULT GetTimeFormat([out] GUID *pFormat);
// Returns S_OK if *pFormat is the current time format, otherwise S_FALSE
// This may be used instead of the above and will save the copying of the GUID
HRESULT IsUsingTimeFormat([in] const GUID * pFormat);
// (may return VFE_E_WRONG_STATE if graph is stopped)
HRESULT SetTimeFormat([in] const GUID * pFormat);
// return current properties
HRESULT GetDuration([out] LONGLONG *pDuration);
HRESULT GetStopPosition([out] LONGLONG *pStop);
HRESULT GetCurrentPosition([out] LONGLONG *pCurrent);
// Convert time from one format to another.
// We must be able to convert between all of the formats that we say we support.
// (However, we can use intermediate formats (e.g. MEDIA_TIME).)
// If a pointer to a format is null, it implies the currently selected format.
HRESULT ConvertTimeFormat([out] LONGLONG * pTarget, [in] const GUID * pTargetFormat,
[in] LONGLONG Source, [in] const GUID * pSourceFormat );
// Set current and end positions in one operation
// Either pointer may be null, implying no change
HRESULT SetPositions( [in,out] LONGLONG * pCurrent, [in] DWORD dwCurrentFlags
, [in,out] LONGLONG * pStop, [in] DWORD dwStopFlags );
// Get CurrentPosition & StopTime
// Either pointer may be null, implying not interested
HRESULT GetPositions( [out] LONGLONG * pCurrent,
[out] LONGLONG * pStop );
// Get earliest / latest times to which we can currently seek "efficiently".
// This method is intended to help with graphs where the source filter has
// a very high latency. Seeking within the returned limits should just
// result in a re-pushing of already cached data. Seeking beyond these
// limits may result in extended delays while the data is fetched (e.g.
// across a slow network).
// (NULL pointer is OK, means caller isn't interested.)
HRESULT GetAvailable( [out] LONGLONG * pEarliest, [out] LONGLONG * pLatest );
// Rate stuff
HRESULT SetRate([in] double dRate);
HRESULT GetRate([out] double * pdRate);
// Preroll
HRESULT GetPreroll([out] LONGLONG * pllPreroll);
}
typedef IMediaSeeking *PMEDIASEEKING;
// Flags for IMediaEventEx
cpp_quote("enum tagAM_MEDIAEVENT_FLAGS")
cpp_quote("{")
cpp_quote(" AM_MEDIAEVENT_NONOTIFY = 0x01")
cpp_quote("};")
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