AVIOLDINDEX Structure
| Microsoft DirectShow 9.0 |
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.
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:
| Two-character code | Description |
| 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:
| Value | Description |
| 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