ext/ffmpeg/: Welcome the demuxers to 0.10 :)

ext/ffmpeg/: Welcome the demuxers to 0.10 :)

Original commit message from CVS:
* ext/ffmpeg/Makefile.am:
* ext/ffmpeg/gstffmpeg.c: (plugin_init):
* ext/ffmpeg/gstffmpegdemux.c: (gst_ffmpegdemux_base_init),
(gst_ffmpegdemux_init), (gst_ffmpegdemux_stream_from_pad),
(gst_ffmpegdemux_handle_seek), (gst_ffmpegdemux_src_event),
(gst_ffmpegdemux_src_query_list), (gst_ffmpegdemux_src_query),
(gst_ffmpegdemux_add), (gst_ffmpegdemux_open),
(gst_ffmpegdemux_loop), (gst_ffmpegdemux_sink_activate),
(gst_ffmpegdemux_sink_activate_pull),
(gst_ffmpegdemux_change_state), (gst_ffmpegdemux_register):
* ext/ffmpeg/gstffmpegprotocol.c: (gst_ffmpegdata_open),
(gst_ffmpegdata_peek), (gst_ffmpegdata_read),
(gst_ffmpegdata_write), (gst_ffmpegdata_seek),
(gst_ffmpegdata_close):
Welcome the demuxers to 0.10 :)
For the time being the demuxers work only pull-based.
Seeking, querying works.