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flashsvenc: replace bitstream description by a link to the specification

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An official specification now exists and it is both more detailed and
easier to understand than the incomplete notes available here.
This commit is contained in:
Diego Biurrun 2011-07-15 19:45:17 +02:00
parent 20a6f210cd
commit 86e8272a23
1 changed files with 5 additions and 14 deletions
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19
libavcodec/flashsvenc.c
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@ -27,22 +27,13 @@
* Flash Screen Video encoder
* @author Alex Beregszaszi
* @author Benjamin Larsson
*
* A description of the bitstream format for Flash Screen Video version 1/2
* is part of the SWF File Format Specification (version 10), which can be
* downloaded from http://www.adobe.com/devnet/swf.html.
*/
/* Bitstream description
* The picture is divided into blocks that are zlib-compressed.
*
* The decoder is fed complete frames, the frameheader contains:
* 4 bits of block width
* 12 bits of frame width
* 4 bits of block height
* 12 bits of frame height
*
* Directly after the header are the compressed blocks. The blocks
* have their compressed size represented with 16 bits in the beginning.
* If the size = 0 then the block is unchanged from the previous frame.
* All blocks are decompressed until the buffer is consumed.
*
/*
* Encoding ideas: A basic encoder would just use a fixed block size.
* Block sizes can be multiples of 16, from 16 to 256. The blocks don't
* have to be quadratic. A brute force search with a set of different