ビデオ/Screen Video ビットストリームフォーマットのバックアップ(No.1) - Flash SWF Spec

[ トップ ] [ 一覧 | 単語検索 | 最終更新 | ヘルプ | ログイン ]

バックアップ一覧
差分を表示
現在との差分を表示
ソースを表示
ビデオ/Screen Video ビットストリームフォーマットへ行く。
- 1 (2010-06-20 (日) 02:25:19)
- 2 (2010-06-20 (日) 02:27:14)
- 3 (2010-06-21 (月) 23:00:01)

Screen Video bitstream format †

SCREENVIDEOPACKET †

Field	Type	Comment
BlockWidth	UB[4]	Pixel width of each block in the grid. This value is stored as (actualWidth / 16) - 1, so possible block sizes are a multiple of 16 and not more than 256.
ImageWidth	UB[12]	Pixel width of the full image.

BlockHeight UB[4] Pixel height of each block in
the grid. This value is stored
as (actualHeight / 16) - 1, so
possible block sizes are a
multiple of 16 and not more
than 256.

ImageHeight	UB[12]	Pixel height of the full image.
ImageBlocks	IMAGEBLOCK[n]	Blocks of image data. See preceding for details of how to calculate n. Blocks are ordered from bottom left to top right, in rows.

Image block †

IMAGEBLOCK †

Field Type Comment

DataSize UB[16]	Note: UB[16] is not the same as UI16; no byte swapping occurs.	Size of the compressed block data that follows. If this is an interframe, and this block is not changed since the last keyframe, DataSize is 0 and the Data field is absent.
Data	If DataSize > 0, UI8[DataSize]	Pixel data compressed using ZLIB. Pixels are ordered from bottom left to top right in rows. Each pixel is three bytes: B, G, R.