vf_hwmap: Add device derivation

Multimedia / FFmpeg - Mark Thompson [jkqxz.net] - 14 June 2017 17:27 EDT

Also refactor a little and improve error messages to make failure cases easier to understand.

(cherry picked from commit 38cb05f1c89cae1862b360d4e7e3f0cd2b5bbb67)

b2ef1f4 vf_hwmap: Add device derivation
libavfilter/vf_hwmap.c | 67 ++++++++++++++++++++++++++++++++++++--------------
1 file changed, 49 insertions(+), 18 deletions(-)

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