According to the tests in 23b72ad, when we are reading a compressed stream, the type returned by `stream_props_GetMediaType()` should reflect compressed format even if we finnally output uncomressed data. For example, if we use wmvcore reader to read a WMV3 stream and output RGB24, the format information returned by `stream_props_GetMediaType()` should be WMV3, not RGB24.
This patch set is marked as draft now, because PATCH 2 and PATCH 3 is affected by 3e8936a2 in MR !2258. So I'll submit a newer version of this after !2258 get merged.
-- v6: winegstreamer: Use stream format in stream_props_GetMediaType. winegstreamer: Implement amt_from_wg_format_video_wmv. winegstreamer: Implement wg_parser_stream_get_stream_format. winegstreamer: Introduce format_is_compressed.