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Contents
require 'attached/processor/base'
require 'attached/processor/error'
module Attached
module Processor
class Audio < Base
attr_reader :path
attr_reader :extension
attr_reader :preset
attr_reader :attachment
# Create a processor.
#
# Parameters:
#
# * file - The file to be processed.
# * options - The options to be applied to the processing.
# * attachment - The attachment the processor is being run for.
def initialize(file, options = {}, attachment = nil)
super
@path = self.file.path
@preset = options[:preset]
@extension = options[:extension]
@extension ||= self.attachment.extension
end
# Redirect output path.
def redirect
">/dev/null 2>&1" if File.exist?("/dev/null")
end
# Helper function for calling processors.
#
# Usage:
#
# self.process
def process
result = Tempfile.new(["", self.extension])
result.binmode
begin
parameters = []
parameters << "--preset #{self.preset}" if self.preset
parameters << self.path
parameters << result.path
parameters = parameters.join(" ").squeeze(" ")
`lame #{parameters} #{redirect}`
raise Errno::ENOENT if $?.exitstatus == 127
rescue Errno::ENOENT
raise "command 'lame' not found: ensure LAME is installed"
end
unless $?.exitstatus == 0
raise Attached::Processor::Error, "must be an audio file"
end
return result
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems