[FFmpeg-devel] [PATCH] TXD demuxer and decoder
Fri May 4 17:32:10 CEST 2007
The following patch implements a demuxer and decoder for .txd files, used by
various games that use the Renderware engine, like Grand Theft Auto. See
http://wiki.multimedia.cx/index.php?title=TXD for details.
I decided to place the S3TC decoding functions in a separate file as they
are pretty generic and used in other (Microsoft) formats too, like
DirectShow Surfaces. This way they can easily be re-used in the future.
Currently, the code demuxes and decodes all GTA:SA files I have tested
correctly, except for one problem with mid-stream dimension changes which I
Message-Id: <200705040110.13009.ivop at euronet.nl>
Subject: [FFmpeg-devel] Multiple frame dimensions in a single stream
I have traced the problem back to ffmpeg.c which sets the output
AVCodecContext parameters once at the beginning, based on the input
context, which is based on the first frame in the TXD case. It does not
handle changes of the input context. Fixing that is non-trivial because of
potential padding/cropping/scaling of the frames and is also outside the
scope of this patch. But I will look into it as it affects other codecs
that support multiple dimensions in one stream as well.
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