101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
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// Copyright (c) 1999 Microsoft Corporation. All rights reserved.
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//
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// Declaration of CSegTriggerTrack.
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//
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// This track type holds events that cause other segments to be cued at
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// specific points during playback of a segment.
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#pragma once
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#include "trackhelp.h"
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#include "tlist.h"
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#include "smartref.h"
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//////////////////////////////////////////////////////////////////////
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// Types
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// Items in list of events
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struct TriggerInfo
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{
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TriggerInfo() : lTriggerTime(0), lTimePhysical(0), dwPlayFlags(0), dwFlags(0), pIDMSegment(NULL) {}
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~TriggerInfo() {
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RELEASE(pIDMSegment);
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}
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HRESULT Clone(const TriggerInfo &o, MUSIC_TIME mtStart)
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{
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lTriggerTime = o.lTriggerTime - mtStart;
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lTimePhysical = o.lTimePhysical - mtStart;
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dwPlayFlags = o.dwPlayFlags;
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dwFlags = o.dwFlags;
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pIDMSegment = o.pIDMSegment;
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pIDMSegment->AddRef();
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return S_OK;
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}
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// from event header chunk <scrh>
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MUSIC_TIME lTriggerTime; // Logical time
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MUSIC_TIME lTimePhysical;
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DWORD dwPlayFlags;
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DWORD dwFlags;
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// from reference <DMRF>
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IDirectMusicSegment *pIDMSegment;
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};
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// State data. This track needs to get the audio path that's currently playing so that it
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// can use it when playing triggered segments.
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struct CSegTriggerTrackState : public CStandardStateData<TriggerInfo>
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{
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CSegTriggerTrackState() : pAudioPath(NULL) {};
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~CSegTriggerTrackState() { if (pAudioPath) pAudioPath->Release(); }
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IDirectMusicAudioPath *pAudioPath;
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};
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//////////////////////////////////////////////////////////////////////
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// CSegTriggerTrack
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class CSegTriggerTrack;
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typedef CPlayingTrack<CSegTriggerTrack, TriggerInfo, CSegTriggerTrackState> CSegTriggerTrackBase;
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class CSegTriggerTrack
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: public CSegTriggerTrackBase
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{
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public:
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// When the segment trigger track plays one of its items, it plays a segment. If an invalidation occurs, that Play operation
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// can't be retracted. Then the track is played again (with the FLUSH bit set). This was causing it to trigger the segment
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// a second time. To fix this, the last parameter to the CSegTriggerTrackBase is false, which instructs it not to call play
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// a second time when the FLUSH bit is set.
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CSegTriggerTrack(HRESULT *pHr) : CSegTriggerTrackBase(&g_cComponent, CLSID_DirectMusicSegmentTriggerTrack, true, false), m_dwFlags(NULL), m_dwRecursionCount(0) {}
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// Implement SetParam by calling SetParam in turn on all the child segments. This is needed, for example so that downloading a segment with a segment trigger track will download all the triggered segments as well.
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STDMETHOD(IsParamSupported)(REFGUID rguid) { return S_OK; } // Once or more of our child segments could potentially support any type of parameter.
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STDMETHOD(SetParam)(REFGUID rguid, MUSIC_TIME mtTime, void *pData);
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STDMETHOD(InitPlay)(
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IDirectMusicSegmentState *pSegmentState,
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IDirectMusicPerformance *pPerformance,
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void **ppStateData,
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DWORD dwTrackID,
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DWORD dwFlags);
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protected:
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HRESULT PlayItem(
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const TriggerInfo &item,
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statedata &state,
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IDirectMusicPerformance *pPerf,
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IDirectMusicSegmentState* pSegSt,
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DWORD dwVirtualID,
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MUSIC_TIME mtOffset,
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REFERENCE_TIME rtOffset,
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bool fClockTime);
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HRESULT LoadRiff(SmartRef::RiffIter &ri, IDirectMusicLoader *pIDMLoader);
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private:
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HRESULT LoadTrigger(SmartRef::RiffIter ri, IDirectMusicLoader *pIDMLoader);
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// Data
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DWORD m_dwFlags; // from track header (sgth chunk)
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BOOL m_dwRecursionCount; // Used to keep track of recursive calls to self.
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};
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