Improve handling where FFmpeg may call the provided file reader with
AVSEEK_SIZE repeatedly, when file size is not likely to change between
repeated calls. This prevents repeated seek operations that would
otherwise be required to probe the file size each time.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
Remove deprecated functions, make use of free functions that clear the
pointers before returning, etc.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
Since in one case, it probably wasn't combining them into one stack
allocation, it probably blew up the stack allocation quite a bit.
Signed-off-by: Christopher Snowhill <kode54@gmail.com>
