Please update and incorporate SpeedHQ Encoder patches from July

[dgatwood]

Summary of the bug:

Back in July, Jean-Baptiste Kempf wrote a patch to incorporate SpeedHQ encoding support.

​https://www.mail-archive.com/ffmpeg-devel@ffmpeg.org/msg105907.html

Unfortunately, it looks like the patch hasn't been update since July, so I can only assume that it has slipped through the cracks.

I'm actively working on code that uses FFMPEG's libraries to mux some raw data in that format, but unfortunately, that seems to be impossible because there's no encoder. I can patch in the changes by hand for now, but it would be nice if the support were actually in the tree (particularly because the comments sound like there might be some thread safety problems in the code as written).

Could somebody please take a look at that patch set, figure out what needs to be done to bring it up to spec, and get it checked in? :-)

How to reproduce:

Write code that attempts to mux data in the SpeedHQ codec. Observe that avcodec_find_encoder(AV_CODEC_ID_SPEEDHQ) returns NULL.

[Carl Eugen Hoyos]

This is not a valid ticket, feel free to ping the patch on the mailing list (or J-B or another active developer).