Class: DTAS::TFX

Inherits:
Object
  • Object
show all
Includes:
ParseTime
Defined in:
lib/dtas/tfx.rb

Overview

this will represent a trim section inside -splitfx for applying effects to only a part of the output

Defined Under Namespace

Classes: TFXSort

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ParseTime

#parse_time

Constructor Details

#initialize(args, format = DTAS::Format.new) ⇒ TFX

Returns a new instance of TFX.



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# File 'lib/dtas/tfx.rb', line 17

def initialize(args, format = DTAS::Format.new)
  @format = format
  args = args.dup
  case args.shift
  when :pad # [ :pad, start_time, end_time ]
    @tbeg = args.shift
    @tlen = args.shift - @tbeg
  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

Instance Attribute Details

#cmd ⇒ Object (readonly)

Returns the value of attribute cmd.



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# File 'lib/dtas/tfx.rb', line 15

def cmd
  @cmd
end

#tbeg ⇒ Object (readonly)

Returns the value of attribute tbeg.



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# File 'lib/dtas/tfx.rb', line 13

def tbeg
  @tbeg
end

#tlen ⇒ Object (readonly)

Returns the value of attribute tlen.



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# File 'lib/dtas/tfx.rb', line 14

def tlen
  @tlen
end

Class Method Details

.expand(ary, total_samples) ⇒ Object

like schedule, but fills in the gaps with pass-through (no-op) TFX objs This does not change the number of epochs.



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# File 'lib/dtas/tfx.rb', line 144

def self.expand(ary, total_samples)
  rv = []
  schedule(ary).each_with_index do |sary, epoch|
    tip = 0
    dst = rv[epoch] = []
    while tfx = sary.shift
      if tfx.tbeg > tip
        # fill in the previous gap
        nfx = new([:pad, tip, tfx.tbeg])
        dst << nfx
        dst << tfx
        tip = tfx.tbeg + tfx.tlen
      end
    end
    if tip < total_samples # fill until the last chunk
      nfx = new([:pad, tip, total_samples])
      dst << nfx
    end
  end
  rv
end

.schedule(ary) ⇒ Object

sorts and converts an array of TFX objects into non-overlapping arrays of epochs

input:

[ tfx1, tfx2, tfx3, ... ]

output:

[
  [ tfx1 ],         # first epoch
  [ tfx2, tfx3 ],   # second epoch
  ...
]

There are multiple epochs only if ranges overlap, There is only one epoch if there are no overlaps



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# File 'lib/dtas/tfx.rb', line 109

def self.schedule(ary)
  sorted = []
  ary.each_with_index { |tfx, i| sorted << TFXSort[tfx, i] }
  sorted.sort!
  rv = []
  epoch = 0
  prev_end = 0
  defer = []

  begin
    while tfxsort = sorted.shift
      tfx = tfxsort.tfx
      if tfx.tbeg >= prev_end
        # great, no overlap, append to the current epoch
        prev_end = tfx.tbeg + tfx.tlen
        (rv[epoch] ||= []) << tfx
      else
        # overlapping region, we'll need a new epoch
        defer << tfxsort
      end
    end

    if defer[0] # do we need another epoch?
      epoch += 1
      sorted = defer
      defer = []
      prev_end = 0
    end
  end while sorted[0]

  rv
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/dtas/tfx.rb', line 83

def <=>(other)
  tbeg <=> other.tbeg
end

#parse_trim!(args) ⇒ Object

tries to interpret “trim” time args the same way the sox trim effect does This takes time arguments only, not sample counts; otherwise, deviations from sox are considered bugs in dtas



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# File 'lib/dtas/tfx.rb', line 69

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)
    tlen = tlen - tbeg if is_stop_time
    @tlen = (tlen * @format.rate).round
  else
    @tlen = nil
  end
  @tbeg = (tbeg * @format.rate).round
end

#tfx_eca(args) ⇒ Object 



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# File 'lib/dtas/tfx.rb', line 48

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))
end

#tfx_sox(args) ⇒ Object 



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# File 'lib/dtas/tfx.rb', line 43

def tfx_sox(args)
  @cmd = %w(sox $SOXIN $SOXOUT $TRIMFX)
  @cmd.concat(args)
end

#to_sox_arg ⇒ Object 



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# File 'lib/dtas/tfx.rb', line 55

def to_sox_arg
  if @tbeg && @tlen
    %W(trim #{@tbeg}s #{@tlen}s)
  elsif @tbeg
    return [] if @tbeg == 0
    %W(trim #{@tbeg}s)
  else
    []
  end
end