AVIINDEXENTRY

The AVI file index consists of an array of AVIINDEXENTRY structures contained within an 'idx1' chunk at the end of an AVI file. This chunk follows the main LIST 'movi' chunk which contains the actual data.

typedef struc {
    ULONG    ckid;
    ULONG    ulFlags;
    ULONG    ulChunkOffset;
    ULONG    ulChunkLength;
} AVIINDEXENTRY;

The AVIINDEXENTRY structure has the following fields:

Field

Description
ckid
Specifies a four-character code corresponding to the chunk ID of a data chunk in the file.
ulFlags
Specifies any applicable flags. The flags in the low-order word are reserved for AVI, while those in the high-order word can be used for stream- and compressor/decompressor-specific information.

The following values are currently defined:

AVIIF_LIST

Indicates the specified chunk is a 'LIST' chunk, and the ckid field contains the list type of the chunk.
AVIIF_KEYFRAME
Indicates this chunk is a key frame. Key frames do not require additional preceding chunks to be properly decoded.
AVIIF_FIRSTPART
Indicates this chunk needs the frames following it to be used; it cannot stand alone.
AVIIF_LASTPART
Indicates this chunk needs the frames preceding it to be used; it cannot stand alone.
AVIIF_NOTIME
Indicates this chunk should have no effect on timing or calculating time values based on the number of chunks. For example, palette change chunks in a video stream should have this flag set, so that they are not counted as taking up a frame's worth of time.
ulChunkOffset
Specifies the position in the file of the specified chunk. The position value includes the eight byte RIFF header.
ulChunkLength
Specifies the length of the specified chunk. The length value does not include the eight byte RIFF header.

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