[xine-devel] use a probing function for the demuxers

[Marco <M.Z...@fr...>]

Hi,

for my try to reduce common code in the demuxer I had
to read a loit of demuxer code and got familar with the 
way the demuxer work.

So that resulted in the idea to have a class function
"probe" which gets a structure xine_probe_t

struct xine_probe_s {
  uint8_t   *buffer;
  int       buffer_size; /* <=MAX_PREVIEW_SIZE */ 
  char      *mrl;
  uint32_t  input_cap;
};

and the content_detection_method and then tries to
deduce if the demuxer is able to handle this
input-stream.

At the moment each demuxer (we have 40!!)
creates an instance, and reads from the
input-plugin. With my change only the
demuxer loading function has to fill the buffer
and hands the structure to every demuxer.
I think with the every growing number of
fileformats/demuxer xine supports this should speed
up the detection process quite a bit.

Because no every demuxer can guess on the first 4k Bytes
if it is able to handle that stream (and to ease the
conversion) the probe function should be optional.
So if no probe function is present for a demuxer
an instace is created with open_plugin.

If nobody objects I will go on with this change.

In a first rush I will extend demux_class_t,
bump the demuxer API version and change some "easy" demuxer".


cu Marco