Ace Film
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== Overview == | == Overview == | ||
| − | Ace Film is an animation file format used on early RISC OS systems (file type D6A, AceFilm), allowing graphics created using Ace Computing's applications to be stored as a series of frames in a file, to be replayed layer using the Projector application. Applications used to generate Ace Film files included Tween, Mogul and [[Euclid (Ace Computing)|Euclid]]. | + | '''Ace Film''' is an animation file format used on early RISC OS systems ([[RISC OS filetype|file type]] D6A, AceFilm), allowing graphics created using Ace Computing's applications to be stored as a series of frames in a file, to be replayed layer using the Projector application. Applications used to generate Ace Film files included Tween, Mogul and [[Euclid (Ace Computing)|Euclid]]. |
| − | == | + | == Format details == |
| − | + | All lengths and offsets are in bytes. Words are 4 bytes. | |
| − | * [ | + | |
| + | 0x0: File length (4 bytes) | ||
| + | 0x4: Title (12 bytes, ASCII, low bytes ignored, can contain spaces) | ||
| + | 0x10: Offset into the file of data (data_offset) | ||
| + | 0x14: | ||
| + | 0x18: | ||
| + | 0x1c: Number of colours? | ||
| + | |||
| + | Each frame is described by a data length followed by the data itself, then | ||
| + | followed by the data length again, presumably to make it easy to traverse the | ||
| + | file in both directions: | ||
| + | |||
| + | data_offset: length of data (including this word) (data_length) | ||
| + | ... | ||
| + | data_offset + data_length - 4: data_length | ||
| + | |||
| + | == Sample files == | ||
| + | |||
| + | * There are some examples in the [https://archive.org/details/ftpsites_arcade.demon.co.uk_2013.06.17 Arcade BBS Filebase] (may be [[Spark]]-compressed) | ||
| + | |||
| + | [[Category:RISC OS]] | ||
Latest revision as of 19:55, 9 May 2021
[edit] Overview
Ace Film is an animation file format used on early RISC OS systems (file type D6A, AceFilm), allowing graphics created using Ace Computing's applications to be stored as a series of frames in a file, to be replayed layer using the Projector application. Applications used to generate Ace Film files included Tween, Mogul and Euclid.
[edit] Format details
All lengths and offsets are in bytes. Words are 4 bytes.
0x0: File length (4 bytes) 0x4: Title (12 bytes, ASCII, low bytes ignored, can contain spaces) 0x10: Offset into the file of data (data_offset) 0x14: 0x18: 0x1c: Number of colours?
Each frame is described by a data length followed by the data itself, then followed by the data length again, presumably to make it easy to traverse the file in both directions:
data_offset: length of data (including this word) (data_length) ... data_offset + data_length - 4: data_length
[edit] Sample files
- There are some examples in the Arcade BBS Filebase (may be Spark-compressed)
