Class: DTAS::PartStats

Inherits:
Object
  • Object
show all
Includes:
Process
Defined in:
lib/dtas/partstats.rb

Defined Under Namespace

Classes: TrimPart

Constant Summary collapse

CMD = 
'sox "$INFILE" -n $TRIMFX $SOXFX stats $STATSOPTS'

Constants included from Process

DTAS::Process::PIDS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Process

#dtas_spawn, #env_expand, #qx, reaper

Methods included from XS

#xs

Constructor Details

#initialize(infile) ⇒ PartStats

Returns a new instance of PartStats.



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# File 'lib/dtas/partstats.rb', line 26

def initialize(infile)
  @infile = infile
  %w(samples rate channels).each do |iv|
    sw = iv[0] # -s, -r, -c
    i = qx(%W(soxi -#{sw} #@infile)).to_i
    raise ArgumentError, "invalid #{iv}: #{i}" if i <= 0
    instance_variable_set("@#{iv}", i)
  end

  # "Pk lev dB" => 1, "RMS lev dB" => 2, ...
  @key_nr = 0
  @key_idx = Hash.new { |h,k| h[k] = (@key_nr += 1) }
  @key_width = {}
end

Instance Attribute Details

#key_idx ⇒ Object (readonly)

Returns the value of attribute key_idx.



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

def key_idx
  @key_idx
end

#key_width ⇒ Object (readonly)

Returns the value of attribute key_width.



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

def key_width
  @key_width
end

Instance Method Details

#parse_stats(stats, trim_part, buf) ⇒ Object

Overall Left Right DC offset 0.001074 0.000938 0.001074 Min level -0.997711 -0.997711 -0.997711 Max level 0.997681 0.997681 0.997681 Pk lev dB -0.02 -0.02 -0.02 RMS lev dB -10.38 -9.90 -10.92 RMS Pk dB -4.62 -4.62 -5.10 RMS Tr dB -87.25 -86.58 -87.25 Crest factor - 3.12 3.51 Flat factor 19.41 19.66 18.89 Pk count 117k 156k 77.4k Bit-depth 16/16 16/16 16/16 Num samples 17.2M Length s 389.373 Scale max 1.000000 Window s 0.050

becomes:

[
  TrimPart,
  [ -0.02, -0.02, -0.02 ], # Pk lev dB
  [ -10.38, -9.90, -10.92 ], # RMS lev dB
  ...
]



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# File 'lib/dtas/partstats.rb', line 162

def parse_stats(stats, trim_part, buf)
  trim_row = [ trim_part ]
  buf.split(/\n/).each do |line|
    do_map = true
    case line
    when /\A(\S+ \S+ dB)\s/, /\A(Crest factor)\s+-\s/
      nshift = 3
    when /\A(Flat factor)\s/
      nshift = 2
    when /\A(Pk count)\s/
      nshift = 2
      do_map = false
    else
      next
    end
    key = $1
    key.freeze
    key_idx = @key_idx[key]
    parts = line.split(/\s+/)
    nshift.times { parts.shift } # remove stuff we don't need
    @key_width[key] = parts.size
    trim_row[key_idx] = do_map ? parts.map!(&:to_f) : parts
  end
  stats[trim_part.tbeg / trim_part.tlen] = trim_row
end

#partitions(chunk_sec) ⇒ Object 



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# File 'lib/dtas/partstats.rb', line 41

def partitions(chunk_sec)
  n = 0
  part_samples = chunk_sec * @rate
  rv = []
  begin
    rv << TrimPart.new(n, part_samples, @rate)
    n += part_samples
  end while n < @samples
  rv
end

#run(opts = {}) ⇒ Object 



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# File 'lib/dtas/partstats.rb', line 68

def run(opts = {})
  sev = DTAS::Sigevent.new
  trap(:CHLD) { sev.signal }
  jobs = opts[:jobs] || 2
  pids = {}
  rset = {}
  stats = []
  fails = []
  do_spawn = lambda do |trim_part|
    pid, rpipe = spawn(trim_part, opts)
    rset[rpipe] = [ trim_part, "" ]
    pids[pid] = [ trim_part, rpipe ]
  end

  parts = partitions(opts[:chunk_length] || 10)
  jobs.times do
    trim_part = parts.shift or break
    do_spawn.call(trim_part)
  end

  rset[sev] = true

  while pids.size > 0
    r = IO.select(rset.keys) or next
    r[0].each do |rd|
      if DTAS::Sigevent === rd
        rd.readable_iter do |_,_|
          begin
            pid, status = Process.waitpid2(-1, Process::WNOHANG)
            pid or break
            done = pids.delete(pid)
            done_part = done[0]
            if status.success?
              trim_part = parts.shift and do_spawn.call(trim_part)
              puts "DONE #{done_part}" if $DEBUG
            else
              fails << [ done_part, status ]
            end
          rescue Errno::ECHILD
            break
          end while true
        end
      else
        # spurious wakeup should not happen on local pipes,
        # so readpartial should be safe
        trim_part, buf = rset[rd]
        begin
          buf << rd.readpartial(666)
        rescue EOFError
          rset.delete(rd)
          rd.close
          parse_stats(stats, trim_part, buf)
        end
      end
    end
  end

  return stats if fails.empty? && parts.empty?
  fails.each do |(trim_part,status)|
    warn "FAIL #{status.inspect} #{trim_part}"
  end
  false
ensure
  sev.close
end

#spawn(trim_part, opts) ⇒ Object 



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# File 'lib/dtas/partstats.rb', line 52

def spawn(trim_part, opts)
  rd, wr = IO.pipe
  env = opts[:env]
  env = env ? env.dup : {}
  env["INFILE"] = @infile
  env["TRIMFX"] = "trim #{trim_part.tbeg}s #{trim_part.tlen}s"
  opts = { pgroup: true, close_others: true, err: wr }
  pid = begin
    Process.spawn(env, CMD, opts)
  rescue Errno::EINTR # Ruby bug?
    retry
  end
  wr.close
  [ pid, rd ]
end