It seems ffmpeg/libav reads a file type like Monkey's audio in large
chunks, so that each packet must be passed to the decoder multiple
times. The decoder will return 0 until the packet is completed. This
change makes forked-daapd able to deal with a return value of 0.
Also includes the skeleton for perhaps supporting video in the future. Adds more fine-grained
ffmpeg/libav compability checks. Dependency on libavresample/libswresample exchanged with
dependency on libavfilter, which seems more versatile.
- Try to not return items which a client can't play
- Remove inotify subscription to IN_MODIFY and IN_CREATE
- Fix crash on unknown codec type in transcode.c
- Probably added some new bugs...
Try to be a bit more strict about integer types, use off_t or int64_t for
file size and file offsets.
Replace safe_ato*() by safe_atoi32() and safe_atoi64(), fix integer types
at call sites to match.
