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| | # Copyright (C) 2013, Eric Wong <normalperson@yhbt.net> and all contributors
# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
require_relative '../dtas'
require_relative 'parse_time'
require 'shellwords'
class DTAS::TrimFX
include DTAS::ParseTime
attr_reader :tbeg
attr_reader :tlen
attr_reader :cmd
def initialize(args)
args = args.dup
case args.shift
when "trim"
parse_trim!(args)
when "all"
@tbeg = 0
@tlen = nil
else
raise ArgumentError, "#{args.inspect} not understood"
end
case tmp = args.shift
when "sh" then @cmd = args
when "sox" then tfx_sox(args)
when "eca" then tfx_eca(args)
when nil
@cmd = []
else
raise ArgumentError, "unknown effect type: #{tmp}"
end
end
def tfx_sox(args)
@cmd = %w(sox $SOXIN $SOXOUT $TRIMFX)
@cmd.concat(args)
@cmd.concat(%w($FADEFX))
end
def tfx_eca(args)
@cmd = %w(sox $SOXIN $SOX2ECA $TRIMFX)
@cmd.concat(%w(| ecasound $ECAFMT -i stdin -o stdout))
@cmd.concat(args)
@cmd.concat(%w(| sox $ECA2SOX - $SOXOUT $FADEFX))
end
def to_sox_arg(format)
if @tbeg && @tlen
beg = @tbeg * format.rate
len = @tlen * format.rate
%W(trim #{beg.round}s #{len.round}s)
elsif @tbeg
return [] if @tbeg == 0
beg = @tbeg * format.rate
%W(trim #{beg.round}s)
else
[]
end
end
def parse_trim!(args)
tbeg = parse_time(args.shift)
if args[0] =~ /\A=?[\d\.]+\z/
tlen = args.shift
is_stop_time = tlen.sub!(/\A=/, "") ? true : false
tlen = parse_time(tlen)
if is_stop_time
tlen = tlen - tbeg
end
else
tlen = nil
end
@tbeg = tbeg
@tlen = tlen
end
end
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