AVISUPERINDEX structure (aviriff.h)

Articolo
4/26/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Contains an AVI 2.0 super index (index of indexes).

Syntax

typedef struct _avisuperindex {
  FOURCC               fcc;
  UINT                 cb;
  WORD                 wLongsPerEntry;
  BYTE                 bIndexSubType;
  BYTE                 bIndexType;
  DWORD                nEntriesInUse;
  DWORD                dwChunkId;
  DWORD                dwReserved[3];
  struct {
    DWORDLONG qwOffset;
    DWORD     dwSize;
    DWORD     dwDuration;
  } _avisuperindex_entry;
  _avisuperindex_entry aIndex[NUMINDEX(4)];
} AVISUPERINDEX;

Members

fcc

A FOURCC code. The value must be 'indx'.

cb

The size of the structure, not including the initial 8 bytes.

wLongsPerEntry

The size of each index entry, in 4-byte units. The value must be 4.

bIndexSubType

The index subtype. The value must be zero or AVI_INDEX_SUB_2FIELD.

bIndexType

The index type. The value must be AVI_INDEX_OF_INDEXES.

nEntriesInUse

The number of valid entries in the adwIndex array.

dwChunkId

A FOURCC that identifies the object that is indexed.

dwReserved[3]

Reserved. Set the array elements to zero.

_avisuperindex_entry

_avisuperindex_entry.qwOffset

_avisuperindex_entry.dwSize

_avisuperindex_entry.dwDuration

aIndex[NUMINDEX(4)]

An array of structures that contain the following members. The number of elements in the array is calculated from the value of cb.

qwOffset

The offset, in bytes, from the start of the file to the sub-index that this entry points to.

dwSize

The size of the sub-index, in bytes.

dwDuration

The duration of the file that is covered by the sub-index, in stream ticks.

Remarks

For more information, see the OpenDML AVI File Format Extensions, published by the OpenDML AVI M-JPEG File Format Subcommittee. (This resource may not be available in some languages

and countries.)

Requirements

Requirement	Value
Header	aviriff.h

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