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// ParamEnvelope.h: interface for the CParamEnvelope class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_PARAMENVELOPE_H__F04D0178_4674_45AF_9F7A_5C8206DE4CF6__INCLUDED_)
#define AFX_PARAMENVELOPE_H__F04D0178_4674_45AF_9F7A_5C8206DE4CF6__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
////////////////////////////////////////////////////////////////////////////////
typedef std::vector<MP_ENVELOPE_SEGMENT> EnvelopeSegs;
////////////////////////////////////////////////////////////////////////////////
struct ParamInfo
{
MP_PARAMINFO mppi; // external parameter info, as presented to the user
float fInternalMin; // minimum value used by internal processing code
float fInternalMax; // maximum value used by internal processing code
const WCHAR* pwszEnumText; // text for enumerations
float MapToInternal( float fValue ) const;
float MapToExternal( float fValue ) const;
};
////////////////////////////////////////////////////////////////////////////////
class CParamEnvelope : public CCritSec
{
public:
CParamEnvelope();
virtual ~CParamEnvelope();
// Attributes
public:
unsigned GetCount() const
{
return m_envSegs.size();
}
const MP_ENVELOPE_SEGMENT& GetAt( unsigned ix ) const
{
return m_envSegs[ ix ];
}
// Tell the envelope about the parameter being controlled
void SetParamInfo( const ParamInfo& info );
// These methods are called by CMediaParams to manipulate segments in an envelope
HRESULT AddEnvelope( DWORD cSegments, MP_ENVELOPE_SEGMENT* pEnvelopeSegments, double dSamplesPerRefTime );
HRESULT FlushEnvelope( REFERENCE_TIME refTimeStart, REFERENCE_TIME refTimeEnd, double dSamplesPerRefTime );
HRESULT GetEnvelope( DWORD* cSegments, MP_ENVELOPE_SEGMENT* pEnvelopeSegments );
HRESULT SetParam( float fValue );
HRESULT GetParam( float* pfValue );
// Manage UI capture and release
void BeginCapture() { m_bCaptured = TRUE; }
void EndCapture() { m_bCaptured = FALSE; }
// Set the current position, updating current envelope value and deltas
HRESULT UpdateValuesForRefTime( REFERENCE_TIME rt, long lSampleRate );
// Check if automation envelopes have been overriden with a specific value
BOOL IsOverrideActive() const { return m_bOverride || m_bCaptured; }
// Get the current automation data point
float GetCurrentValue() const
{
if (IsOverrideActive())
return m_fOverrideValue;
else
return m_fEnvelopeValue;
}
// Get the current automation deltas (for per-sample rendering)
HRESULT GetCurrentDeltas( double* pdDelta1, double* pdDelta2 ) const
{
if (!m_bValidDeltas)
return E_FAIL;
*pdDelta1 = m_dEnvelopeDelta1;
*pdDelta2 = m_dEnvelopeDelta2;
return S_OK;
}
int IndexForRefTime( REFERENCE_TIME rt ) const;
private:
// Stop overriding data
void stopOverride()
{
if (IsOverrideActive() && GetCount() > 0)
m_bOverride = FALSE;
}
// Make sure the automation track is in a state suitable for playback
void cleanup();
private:
ParamInfo m_info; // information about this parameter
EnvelopeSegs m_envSegs; // the list of envelope segments
float m_fEnvelopeValue; // our evolving dynamic value
double m_dEnvelopeDelta1; // 1st delta of current envelope (w.r.t. seconds)
double m_dEnvelopeDelta2; // 2nd delta of current envelope (w.r.t. seconds)
BOOL m_bValidDeltas; // TRUE when deltas can be used (e.g. except for sin)
BOOL m_bOverride; // TRUE while automation point value is overridden
BOOL m_bCaptured; // TRUE while the captured by the UI
float m_fOverrideValue; // our override value
REFERENCE_TIME m_rtRendered; // latest time rendered so far
private:
CParamEnvelope( const CParamEnvelope& );
CParamEnvelope& operator=( const CParamEnvelope& );
};
////////////////////////////////////////////////////////////////////////////////
#endif // !defined(AFX_PARAMENVELOPE_H__F04D0178_4674_45AF_9F7A_5C8206DE4CF6__INCLUDED_)
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