Class: DTAS::Source::Sox

Inherits:
Object
  • Object
show all
Extended by:
XS
Includes:
File, XS
Defined in:
lib/dtas/source/sox.rb

Overview

this is usually one input file

Direct Known Subclasses

SplitFX

Constant Summary collapse

SOX_DEFAULTS = 
COMMAND_DEFAULTS.merge(
  "command" => 'exec sox "$INFILE" $SOXFMT - $TRIMFX $RGFX',
  "tryorder" => 0,
)

Constants included from File

File::FILE_SIVS, File::SRC_SIVS

Constants included from Process

Process::PIDS

Constants included from Command

Command::COMMAND_DEFAULTS

Instance Attribute Summary

Attributes included from File

#infile, #offset, #tryorder

Attributes included from Common

#dst, #dst_zero_byte, #requeued

Attributes included from Command

#command, #env, #pid, #spawn_at, #to_io

Instance Method Summary collapse

Methods included from XS

xs

Methods included from File

#__file_init, #__offset_samples, #comments, #cuebreakpoints, #load!, #offset_samples, #offset_us, #replaygain, #samples!, #source_file_dup, #to_hash, #to_source_cat, #to_state_hash, #trimfx

Methods included from Mp3gain

#__mp3gain_peak, #mp3gain_comments

Methods included from Process

#dtas_spawn, #env_expand, #env_expand_ary, #env_expand_i, #qx, reaper

Methods included from DTAS::SpawnFix

#spawn

Methods included from Common

#dst_assoc

Methods included from Command

#command_init, #command_string, #on_death

Methods included from DTAS::Serialize

#ivars_to_hash

Constructor Details

#initialize(mcache = nil) ⇒ Sox

Returns a new instance of Sox.



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# File 'lib/dtas/source/sox.rb', line 33

def initialize(mcache = nil)
  @mcache = nil
  @last_failed = nil
  command_init(SOX_DEFAULTS)
end

Instance Method Details

#__load_comments ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 104

def __load_comments
  tmp = {}
  case @infile
  when String
    ent = mcache_lookup(@infile) and tmp = ent['comments']
  end
  tmp
end

#duration ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 91

def duration
  samples / format.rate.to_f
end

#format ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 84

def format
  @format ||= begin
    ent = mcache_lookup(@infile)
    ent ? DTAS::Format.load(ent) : nil
  end
end

#mcache_lookup(infile) ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 39

def mcache_lookup(infile)
  (@mcache ||= DTAS::Mcache.new).lookup(infile) do |input, dst|
    err = ''.b
    out = qx(@env.dup, %W(soxi #{input}), err_str: err, no_raise: true)
    return soxi_failed(infile, out) if Process::Status === out
    return soxi_failed(infile, err) if err =~ /soxi FAIL formats:/
    out =~ /^Duration\s*:[^=]*= (\d+) samples /n
    samples = dst['samples'] = $1.to_i
    return soxi_failed(infile, 0) if samples == 0

    out =~ /^Channels\s*:\s*(\d+)/n and dst['channels'] = $1.to_i
    out =~ /^Sample Rate\s*:\s*(\d+)/n and dst['rate'] = $1.to_i
    out =~ /^Precision\s*:\s*(\d+)-bit/n and dst['bits'] = $1.to_i

    enc = Encoding.default_external # typically Encoding::UTF_8
    if out =~ /\nComments\s*:[ \t]*\n?(.*)\z/mn
      comments = dst['comments'] = {}
      key = nil
      $1.split(/\n/n).each do |line|
        if line.sub!(/^([^=]+)=/ni, '')
          key = DTAS.dedupe_str(DTAS.try_enc($1.upcase, enc))
        end
        (comments[key] ||= ''.b) << "#{line}\n" unless line.empty?
      end
      comments.each do |k,v|
        v.chomp!
        DTAS.try_enc(v, enc)
        comments[k] = DTAS.dedupe_str(v)
      end
    end
    dst
  end
end

#samples ⇒ Object

This is the number of samples according to the samples in the source file itself, not the decoded output



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# File 'lib/dtas/source/sox.rb', line 97

def samples
  (@samples ||= begin
    ent = mcache_lookup(@infile)
    ent ? ent['samples'] : nil
   end) || 0
end

#source_defaults ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 130

def source_defaults
  SOX_DEFAULTS
end

#soxi_failed(infile, msg) ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 23

def soxi_failed(infile, msg)
  return if @last_failed == infile
  @last_failed = infile
  case msg
  when Process::Status then msg = "failed with #{msg.exitstatus}"
  when 0 then msg = 'detected zero samples'
  end
  warn("soxi #{infile}: #{msg}\n")
end

#src_spawn(player_format, rg_state, opts) ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 113

def src_spawn(player_format, rg_state, opts)
  raise "BUG: #{self.inspect}#src_spawn called twice" if @to_io
  e = @env.merge!(player_format.to_env)
  e["INFILE"] = xs(@infile)

  # make sure these are visible to the "current" command...
  e["TRIMFX"] = trimfx
  e["RGFX"] = rg_state.effect(self) || nil
  e.merge!(@rg.to_env) if @rg

  @pid = dtas_spawn(e, command_string, opts)
end

#to_hsh ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 126

def to_hsh
  to_hash.delete_if { |k,v| v == SOX_DEFAULTS[k] }
end

#try(infile, offset = nil, trim = nil) ⇒ Object 



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# File 'lib/dtas/source/sox.rb', line 73

def try(infile, offset = nil, trim = nil)
  ent = mcache_lookup(infile) or return
  ret = source_file_dup(infile, offset, trim)
  ret.instance_eval do
    @samples = ent['samples']
    @format = DTAS::Format.load(ent)
    @comments = ent['comments']
  end
  ret
end