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#pragma once
// Represents a simple media source that only has one stream and outputs a static image
#include "stdafx.h"
class SimpleMediaStream;
class __declspec(uuid("{9812588D-5CE9-4E4C-ABC1-049138D10DCE}"))
SimpleMediaSource : public RuntimeClass<
RuntimeClassFlags<WinRtClassicComMix>,
IMFMediaEventGenerator,
IMFMediaSource,
IMFMediaSourceEx,
IMFGetService,
IKsControl>
{
enum class SourceState
{
Invalid, Stopped, Started, Shutdown
};
public:
// IMFMediaEventGenerator
IFACEMETHOD(BeginGetEvent)(_In_ IMFAsyncCallback *pCallback, _In_ IUnknown *punkState);
IFACEMETHOD(EndGetEvent)(_In_ IMFAsyncResult *pResult, _Out_ IMFMediaEvent **ppEvent);
IFACEMETHOD(GetEvent)(DWORD dwFlags, _Out_ IMFMediaEvent **ppEvent);
IFACEMETHOD(QueueEvent)(MediaEventType met, REFGUID guidExtendedType, HRESULT hrStatus, _In_ const PROPVARIANT *pvValue);
// IMFMediaSource
IFACEMETHOD(CreatePresentationDescriptor)(_Out_ IMFPresentationDescriptor **ppPresentationDescriptor);
IFACEMETHOD(GetCharacteristics)(_Out_ DWORD *pdwCharacteristics);
IFACEMETHOD(Pause)();
IFACEMETHOD(Shutdown)();
IFACEMETHOD(Start)(_In_ IMFPresentationDescriptor *pPresentationDescriptor, _In_ const GUID *pguidTimeFormat, _In_ const PROPVARIANT *pvarStartPosition);
IFACEMETHOD(Stop)();
// IMFMediaSourceEx
IFACEMETHOD(GetSourceAttributes)(_COM_Outptr_ IMFAttributes **ppAttributes);
IFACEMETHOD(GetStreamAttributes)(DWORD dwStreamIdentifier, _COM_Outptr_ IMFAttributes **ppAttributes);
IFACEMETHOD(SetD3DManager)(_In_opt_ IUnknown *pManager);
// IMFGetService
IFACEMETHOD(GetService)(_In_ REFGUID guidService, _In_ REFIID riid, _Out_ LPVOID *ppvObject);
// IKsControl
IFACEMETHOD(KsProperty)(_In_reads_bytes_(ulPropertyLength) PKSPROPERTY pProperty,
_In_ ULONG ulPropertyLength,
_Inout_updates_to_(ulDataLength, *pBytesReturned) LPVOID pPropertyData,
_In_ ULONG ulDataLength,
_Out_ ULONG* pBytesReturned);
IFACEMETHOD(KsMethod)(_In_reads_bytes_(ulMethodLength) PKSMETHOD pMethod,
_In_ ULONG ulMethodLength,
_Inout_updates_to_(ulDataLength, *pBytesReturned) LPVOID pMethodData,
_In_ ULONG ulDataLength,
_Out_ ULONG* pBytesReturned);
IFACEMETHOD(KsEvent)(_In_reads_bytes_opt_(ulEventLength) PKSEVENT pEvent,
_In_ ULONG ulEventLength,
_Inout_updates_to_(ulDataLength, *pBytesReturned) LPVOID pEventData,
_In_ ULONG ulDataLength,
_Out_opt_ ULONG* pBytesReturned);
public:
HRESULT RuntimeClassInitialize();
private:
HRESULT _CheckShutdownRequiresLock();
HRESULT _ValidatePresentationDescriptor(_In_ IMFPresentationDescriptor *pPresentationDescriptor);
CriticalSection _critSec;
SourceState _sourceState{ SourceState::Invalid };
ComPtr<IMFMediaEventQueue> _spEventQueue;
ComPtr<IMFPresentationDescriptor> _spPresentationDescriptor;
ComPtr<IMFAttributes> _spAttributes;
bool _wasStreamPreviouslySelected; // maybe makes more sense as a property of the stream
const DWORD NUM_STREAMS = 1;
ComPtr<SimpleMediaStream> _stream;
};
CoCreatableClass(SimpleMediaSource);
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