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module EDL
# Represents a timewarp. Will be placed in EDL::Event#timewarp
# For a reversed clip, the source start we get from the EDL in the src start
# is the LAST used frame. For a pos rate clip, the source start is the bona fide source start. Nice eh?
class Timewarp
# What is the actual framerate of the clip (float)
attr_accessor :actual_framerate
attr_accessor :clip #:nodoc:
# Does this timewarp reverse the clip?
def reverse?
@actual_framerate < 0
end
# Get the speed in percent
def speed_in_percent
(@actual_framerate / @clip.rec_start_tc.fps) * 100
end
alias_method :speed, :speed_in_percent
# Compute the length of the clip we need to capture. The length is computed in frames and
# is always rounded up (better one frame more than one frame less!)
def actual_length_of_source
# First, get the length of the clip including a transition. This is what we are scaled to.
target_len = @clip.rec_length_with_transition.to_f
# Determine the framerate scaling factor, this is the speed
factor = @actual_framerate / @clip.rec_start_tc.fps
(target_len * factor).ceil.abs
end
# What is the starting frame for the captured clip? If we are a reverse, then the src start of the
# clip is our LAST frame, otherwise it's the first
def source_used_from
# TODO: account for the 2 frame deficiency which is suspicious
compensation = 2
reverse? ? (@clip.src_start_tc - actual_length_of_source + compensation) : @clip.src_start_tc
end
# Where to end the capture? This is also dependent on whether we are a reverse or not
def source_used_upto
source_used_from + actual_length_of_source
end
end
end
Version data entries
15 entries across 15 versions & 2 rubygems