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AVIOLDINDEX structure

The AVIOLDINDEX structure describes an AVI 1.0 index ('idx1' format). New AVI files should use an AVI 2.0 index ('indx' format).

Syntax


typedef struct _avioldindex {
  FOURCC                    fcc;
  DWORD                     cb;
  struct _avioldindex_entry {
    DWORD dwChunkId;
    DWORD dwFlags;
    DWORD dwOffset;
    DWORD dwSize;
  } aIndex[];
} AVIOLDINDEX;

Members

fcc

Specifies a FOURCC code. The value must be 'idx1'.

cb

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

aIndex

Array of structures that contain the following members.

dwChunkId

Specifies a FOURCC that identifies a stream in the AVI file. The FOURCC must have the form 'xxyy' where xx is the stream number and yy is a two-character code that identifies the contents of the stream:

db (Uncompressed video frame)
dc (Compressed video frame)
pc (Palette change)
wb (Audio data)
dwFlags

Specifies a bitwise combination of zero or more of the following flags:

ValueMeaning
AVIIF_KEYFRAME

The data chunk is a key frame.

AVIIF_LIST

The data chunk is a 'rec ' list.

AVIIF_NO_TIME

The data chunk does not affect the timing of the stream. For example, this flag should be set for palette changes.

 

dwOffset

Specifies the location of the data chunk in the file. The value should be specified as an offset, in bytes, from the start of the 'movi' list; however, in some AVI files it is given as an offset from the start of the file.

dwSize

Specifies the size of the data chunk, in bytes.

Remarks

This structure consists of the initial RIFF chunk (the fcc and cb members) followed by one index entry for each data chunk in the 'movi' list.

Requirements

Header

Aviriff.h

See also

AVI RIFF File Reference
DirectShow Structures

 

 

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