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ILMDVRSource::GetFragmentAlignment

Summary

Takes the user-supplied byte range and scans for transport fragment boundaries.

Syntax

#include "ILMDVRSource.h"

Language	Syntax
C	HRESULT ILMDVRSource_GetFragmentAlignment(pILMDVRSource, startOffset, endOffset, pAlignedStartOffset, pAlignedEndOffset)
C++	HRESULT GetFragmentAlignment(startOffset, endOffset, pAlignedStartOffset, pAlignedEndOffset)

Parameters

ILMDVRSource *pILMDVRSource

Pointer to an ILMDVRSource interface.

double startOffset

Specifies the byte offset at which to begin scanning for transport fragments.

double endOffset

Specifies the byte offset at which to stop scanning for transport fragments.

double *pAlignedStartOffset

A pointer to a double variable, storing the offset of the start of the first transport fragment found.

double *pAlignedEndOffset

A pointer to a double variable, storing the offset of the end of the last transport fragment.

Returns

Value	Meaning
S_OK	No error.
S_FALSE	No transport fragment found: pAlignedStartOffset and pAlignedEndOffset are equal to startOffset, and indicate an empty search.

Comments

Use this function along with ILMDVRSource::CopyBufferToFile to save a completely intact MPEG transport fragment. This is demonstrated in the example.

Set up the MPEG multiplexer used for recording to DVR by calling put_OutputType(Mpg2MxT_OutputType_HLS). Doing so guarantees that fragment boundaries start with synchronization frames. Specify the boundary time interval by calling put_ResyncInterval(intervalTime).