Module: DTAS::Player::ClientHandler

Includes:
DTAS::ParseTime, XS
Included in:
DTAS::Player
Defined in:
lib/dtas/player/client_handler.rb

Overview

client protocol handling for -player

Instance Method Summary collapse

Methods included from DTAS::ParseTime

#parse_time

Methods included from XS

#xs

Instance Method Details

#__bp_goto(io, msg, cur, bp) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 827

def __bp_goto(io, msg, cur, bp)
  index = msg[1] or return io.emit('NOINDEX')
  ci = bp[index.to_i] or return io.emit('BADINDEX')
  if offset = msg[2]
    fmt = cur.format
    offset = "#{ci.offset_samples(fmt) + __goto_offset_samples(offset)}s"
  else
    offset = ci.offset
  end
  seek_internal(cur, offset)
  io.emit('OK')
end

#__bp_prev_next(io, msg, cur, bp) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 755

def __bp_prev_next(io, msg, cur, bp)
  # msg = [ (prev|next) [, (track|pregap|subindex|<digit>|any) ]
  case type = msg[1]
  when nil, "track"
    bp.keep_if(&:track?)
  when "pregap"
    bp.keep_if(&:pregap?)
  when "subindex" # any subindex
    bp.keep_if(&:subindex?)
  when /\A\d+\z/ # exact subindex match
    si = type.to_i
    bp.keep_if { |ci| ci.index == si }
  when "any" # anything goes
  else
    return io.emit("INVALID TYPE")
  end
  fmt = cur.format
  ds = __current_decoded_samples
  case msg[0]
  when "next"
    bp.each do |ci|
      next if ci.offset_samples(fmt) < ds
      seek_internal(cur, ci.offset)
      return io.emit("OK")
    end
    # go to the next (real) track if not found
    __current_drop
  when "prev"
    prev = nil
    bp.reverse_each do |ci|
      if prev.nil?
        next if ci.offset_samples(fmt) >= ds
        prev = ci
      else
        seek_internal(cur, ci.offset)
        return io.emit("OK")
      end
    end
    # offset may be nil/zero if we couldn't find a previous breakpoint
    seek_internal(cur, '0')
  end
  io.emit("OK")
end

#__bp_seek(io, msg, cur, bp) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 799

def __bp_seek(io, msg, cur, bp)
  offset = msg[1] or return io.emit('ERR usage: cue seek OFFSET')

  # relative + offset work just like normal, non-CUE "seek"
  offset =~ /\A[\+-]/ and return dpc_seek(io, [ offset ])

  # "=-" is special, it means go before the current index start:
  dir = offset.sub!(/\A=-/, '') ? -1 : 1

  begin
    offset = __offset_to_samples(offset)
  rescue ArgumentError
    return io.emit('ERR bad time format')
  end

  ds = __current_decoded_samples
  fmt = cur.format
  prev = 0
  bp.each do |ci|
    ci_offset = ci.offset_samples(fmt)
    break if ci_offset >= ds
    prev = ci_offset
  end
  offset = offset * dir + prev
  seek_internal(cur, "#{offset < 0 ? 0 : offset}s")
  io.emit('OK')
end

#__buf_reset(buf) ⇒ Object

buf is always @sink_buf for now



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# File 'lib/dtas/player/client_handler.rb', line 339

def __buf_reset(buf) # buf is always @sink_buf for now
  @srv.wait_ctl(buf, :ignore)
  buf.buf_reset
  @srv.wait_ctl(buf, :wait_readable)
end

#__current_decoded_samples ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 218

def __current_decoded_samples
  initial = @current.offset_samples
  decoded = @format.bytes_to_samples(bytes_decoded)
  decoded = out_samples(decoded, @format, @current.format)
  initial + decoded
end

#__current_requeue ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 225

def __current_requeue
  return unless @current

  # no need to requeue if we're already due to die
  return if @current.requeued
  @current.requeued = true

  dst = @current.dst
  # prepare to seek to the desired point based on the number of bytes which
  # passed through dst buffer we want the offset for the @current file,
  # which may have a different rate than our internal @format
  if @current.respond_to?(:infile)
    # this offset in the @current.format (not player @format)
    @queue.unshift([ @current.infile, "#{__current_decoded_samples}s" ])
  else
    # DTAS::Source::Cmd (hash), just rerun it
    @queue.unshift(@current.to_hsh)
  end
  # We also want to hard drop the buffer so we do not get repeated audio.
  __buf_reset(dst)
end

#__goto_offset_samples(offset) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 190

def __goto_offset_samples(offset)
  if offset.sub!(/\A\+/, '')
    __offset_to_samples(offset)
  elsif offset.sub!(/\A-/, '')
    __offset_to_samples(offset) * -1
  else # ignore leading '=' for sox compat with 2nd "trim" arg
    __offset_to_samples(offset)
  end
end

#__offset_direction(offset) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 395

def __offset_direction(offset)
  offset.sub!(/\A\+/, '') ? 1 : (offset.sub!(/\A-/, '') ? -1 : nil)
end

#__offset_to_i(offset, src) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 200

def __offset_to_i(offset, src)
  # either "999s" for 999 samples or HH:MM:SS for time
  offset.sub!(/s\z/, '') ? offset.to_i : src.format.hhmmss_to_samples(offset)
end

#__offset_to_samples(offset) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 205

def __offset_to_samples(offset)
  __offset_to_i(offset, @current)
end

#__seek_offset_adj(dir, offset, src = @current, current_decoded_samples = __current_decoded_samples) ⇒ Object

returns seek offset as an Integer in sample count



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# File 'lib/dtas/player/client_handler.rb', line 210

def __seek_offset_adj(dir, offset,
                      src = @current,
                      current_decoded_samples = __current_decoded_samples)
  n = current_decoded_samples + (dir * __offset_to_i(offset, src))
  n = 0 if n < 0
  "#{n}s"
end

#__sink_activate(sink) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 76

def __sink_activate(sink)
  return if sink.pid
  @targets.concat(sink.sink_spawn(@format))
  @targets.sort_by! { |t| t.sink.prio }
end

#__sink_snapshot(sink) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 117

def __sink_snapshot(sink)
  [ sink.command, sink.env, sink.pipe_size ].inspect
end

#__sink_switch(sink) ⇒ Object

called to activate/deactivate a sink



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# File 'lib/dtas/player/client_handler.rb', line 94

def __sink_switch(sink)
  if sink.active
    if @current
      # maybe it's still alive for now, but it's just being killed
      # do not reactivate it until we've reaped it
      if sink.pid
        drop_sink(sink)

        # we must restart @current if there's a moment we're target-less:
        __current_requeue unless @targets[0]
      else
        __sink_activate(sink)
      end
    end
  else
    drop_sink(sink)
  end
  # if we change any sinks, make sure the event loop watches it for
  # readability again, since we new sinks should be writable, and
  # we've stopped waiting on killed sinks
  @srv.wait_ctl(@sink_buf, :wait_readable)
end

#_dpc_tl_add(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 603

def _dpc_tl_add(io, msg)
  path = msg.shift
  after_track_id = msg.shift
  after_track_id = after_track_id.to_i if after_track_id
  case set_as_current = msg.shift
  when 'true' then set_as_current = true
  when 'false', nil then set_as_current = false
  else
    return io.emit('ERR tl add PATH [after_track_id] [true|false]')
  end
  begin
    track_id = @tl.add_track(path, after_track_id, set_as_current)
    return io.emit('ERR FULL') unless track_id
  rescue ArgumentError => e
    return io.emit("ERR #{e.message}")
  end

  _tl_skip if set_as_current # if @current is playing, it will restart soon

  # start playing if we're currently idle
  next_source(_next) unless need_to_queue
  io.emit(track_id.to_s)
end

#_dpc_tl_clear(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 741

def _dpc_tl_clear(io, msg)
  @tl.clear
  _tl_skip
  io.emit('OK')
end

#_dpc_tl_consume(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 656

def _dpc_tl_consume(io, msg)
  prev = (!!@tl.consume).to_s
  v = msg.shift
  case v
  when nil
  else
    set_bool(io, 'tl consume', v) do |b|
      @tl.consume = b
      __wall("tl consume #{b}")
    end
  end
  io.emit("tl consume #{prev}")
end

#_dpc_tl_current(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 720

def _dpc_tl_current(io, msg)
  track = @tl.cur_track
  io.emit(track ? track.to_path : 'NONE')
end

#_dpc_tl_current_id(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 725

def _dpc_tl_current_id(io, msg)
  track = @tl.cur_track
  io.emit(track ? track.track_id.to_s : 'NONE')
end

#_dpc_tl_get(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 697

def _dpc_tl_get(io, msg)
  res = @tl.get_tracks(msg.map!(&:to_i))
  res.map! { |tid, file| "#{tid}=#{file ? Shellwords.escape(file) : ''}" }
  io.emit("#{res.size} #{res.join(' ')}")
end

#_dpc_tl_goto(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 708

def _dpc_tl_goto(io, msg)
  track_id = msg.shift or return io.emit('ERR track_id not specified')
  offset = msg.shift # may be nil
  if @tl.go_to(track_id.to_i, offset)
    _tl_skip
    next_source(_next) unless need_to_queue
    io.emit('OK')
  else
    io.emit('MISSING')
  end
end

#_dpc_tl_max(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 670

def _dpc_tl_max(io, msg)
  prev = @tl.max
  case msg.shift
  when nil
  when %r{\A(\d[\d_]*)\z} then @tl.max = $1.to_i
  else
    return io.emit('ERR tl max must a non-negative integer')
  end
  io.emit("tl max #{prev}")
end

#_dpc_tl_next(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 730

def _dpc_tl_next(io, msg)
  _tl_skip
  io.emit('OK')
end

#_dpc_tl_prev(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 735

def _dpc_tl_prev(io, msg)
  @tl.previous!
  _tl_skip
  io.emit('OK')
end

#_dpc_tl_remove(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 681

def _dpc_tl_remove(io, msg)
  track_id = msg.shift or return io.emit('ERR track_id not specified')
  track_id = track_id.to_i
  path = @tl.remove_track(track_id) or return io.emit('MISSING')
  rm = path.object_id

  # skip if we're removing the currently playing track
  if @current && @current.respond_to?(:infile) &&
     @current.infile.object_id == rm
    _tl_skip
  end
  # drop it from the queue, too, in case it just got requeued or paused
  @queue.delete_if { |t| Array === t && t[0].object_id == rm }
  io.emit(path)
end

#_dpc_tl_repeat(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 627

def _dpc_tl_repeat(io, msg)
  prev = @tl.repeat.to_s
  do_wall = true
  case msg.shift
  when 'true' then @tl.repeat = true
  when 'false' then @tl.repeat = false
  when '1' then @tl.repeat = 1
  when nil
    do_wall = false
  end
  __wall("tl repeat #{@tl.repeat}") if do_wall
  io.emit("tl repeat #{prev}")
end

#_dpc_tl_shuffle(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 641

def _dpc_tl_shuffle(io, msg)
  prev = (!!@tl.shuffle).to_s
  v = msg.shift
  case v
  when 'debug' then return io.emit(@tl.shuffle.to_yaml) # TODO: remove
  when nil
  else
    set_bool(io, 'tl shuffle', v) do |b|
      @tl.shuffle = b
      __wall("tl shuffle #{b}")
    end
  end
  io.emit("tl shuffle #{prev}")
end

#_dpc_tl_swap(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 747

def _dpc_tl_swap(io, msg)
  usage = 'ERR usage: "tl swap TRACK_ID_A TRACK_ID_B"'
  a_id = msg.shift or return io.emit(usage)
  b_id = msg.shift or return io.emit(usage)
  @tl.swap(a_id.to_i, b_id.to_i) or return io.emit('MISSING')
  io.emit('OK')
end

#_dpc_tl_tracks(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 703

def _dpc_tl_tracks(io, msg)
  tracks = @tl.tracks
  io.emit("#{tracks.size} #{tracks.map!(&:to_s).join(' ')}")
end

#_tl_skip ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 592

def _tl_skip
  @queue.clear
  __current_drop
end

#active_sinks ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 289

def active_sinks
  sinks = @targets.map(&:sink)
  sinks.uniq!
  sinks
end

#adjust_numeric(io, obj, k, v) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 24

def adjust_numeric(io, obj, k, v)
  negate = !!v.sub!(/\A-/, '')
  case v
  when %r{\A\+?\d*\.\d+\z}
    num = v.to_f
  when %r{\A\+?\d+\z}
    num = v.to_i
  else
    return io.emit("ERR #{k}=#{v} must be a float")
  end
  num = -num if negate

  if k.sub!(/\+\z/, '') # increment existing
    num += obj.__send__(k)
  elsif k.sub!(/-\z/, '') # decrement existing
    num = obj.__send__(k) - num
  # else # normal assignment
  end
  obj.__send__("#{k}=", num)
  true
end

#bytes_decoded(src = @current) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 185

def bytes_decoded(src = @current)
  bytes = src.dst.bytes_xfer - src.dst_zero_byte
  bytes = bytes < 0 ? 0 : bytes # maybe negative in case of sink errors
end

#current_expect_samples(in_samples) ⇒ Object

returns the number of samples we expect from the source this takes into account sample rate differences between the source and internal player format



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# File 'lib/dtas/player/client_handler.rb', line 257

def current_expect_samples(in_samples) # @current.samples
  out_samples(in_samples, @current.format, @format)
end

#do_pause ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 362

def do_pause
  return if @paused
  wall("pause")
  @paused = true
  __current_requeue
end

#do_play ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 369

def do_play
  # no wall, next_source will wall on new track
  @paused = false
  return if @current
  n = _next
  unless n
    @tl.reset
    n = _next
  end
  next_source(n)
end

#do_play_pause ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 381

def do_play_pause
  @paused ? do_play : do_pause
end

#dpc_cd(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 546

def dpc_cd(io, msg)
  msg.size == 1 or return io.emit("ERR usage: cd DIRNAME")
  begin
    Dir.chdir(msg[0])
  rescue => e
    return io.emit("ERR chdir: #{e.message}")
  end
  # wall(%W(cd msg[0])) # should we broadcast this?
  io.emit("OK")
end

#dpc_cue(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 840

def dpc_cue(io, msg)
  cur = @current
  if cur.respond_to?(:cuebreakpoints)
    bp = cur.cuebreakpoints
    case msg[0]
    when nil
      tmp = { "infile" => cur.infile, "cue" => bp.map(&:to_hash) }
      io.emit(tmp.to_yaml)
    when "next", "prev"
      return __bp_prev_next(io, msg, cur, bp)
    when 'seek' then return __bp_seek(io, msg, cur, bp)
    when 'goto' then return __bp_goto(io, msg, cur, bp)
    end
  else
    io.emit("NOCUE")
  end
end

#dpc_current(io, msg) ⇒ Object

show current info about what's playing returns non-blocking iterator retval



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# File 'lib/dtas/player/client_handler.rb', line 297

def dpc_current(io, msg)
  tmp = {}
  if @current
    tmp["current"] = s = @current.to_hsh
    s["spawn_at"] = @current.spawn_at
    s["pid"] = @current.pid

    # this offset and samples in the player @format (not @current.format)
    decoded = @format.bytes_to_samples(bytes_decoded)
    if @current.respond_to?(:infile)
      initial = tmp["current_initial"] = @current.offset_samples
      initial = out_samples(initial, @current.format, @format)
      tmp["current_expect"] = current_expect_samples(s["samples"])
      s["format"] = @current.format.to_hash.delete_if { |_,v| v.nil? }
    else
      initial = 0
      tmp["current_expect"] = nil
      s["format"] = @format.to_hash.delete_if { |_,v| v.nil? }
    end
    tmp["current_offset"] = initial + decoded
  end
  tmp["current_inflight"] = @sink_buf.inflight
  tmp["format"] = @format.to_hash.delete_if { |_,v| v.nil? }
  tmp["bypass"] = @bypass.sort!
  t = @trim and tmp['trim'] = t.join(' ')
  if tmp['paused'] = @paused
    first = @queue[0] and tmp['current_paused'] = first
  end
  rg = @rg.to_hsh
  tmp["rg"] = rg unless rg.empty?
  if @targets[0]
    sinks = active_sinks
    tmp["sinks"] = sinks.map! do |sink|
      h = sink.to_hsh
      h["pid"] = sink.pid
      h
    end
  end
  tmp['tracklist'] = @tl.to_hsh(false)
  io.emit(tmp.to_yaml)
end

#dpc_env(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 480

def dpc_env(io, msg)
  if msg.empty?
    # this may fail for large envs due to SEQPACKET size restrictions
    # do we care?
    env = ENV.map do |k,v|
      "#{Shellwords.escape(k)}=#{Shellwords.escape(v)}"
    end.join(' ')
    return io.emit(env)
  end
  msg.each do |kv|
    case kv
    when %r{\A([^=]+)=(.*)\z}
      ENV[$1] = $2
    when %r{\A([^=]+)#}
      ENV.delete($1)
    else
      return io.emit("ERR bad env")
    end
  end
  io.emit("OK")
end

#dpc_format(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 445

def dpc_format(io, msg)
  new_fmt = @format.dup
  msg.each do |kv|
    k, v = kv.split('=', 2)
    case k
    when "type"
      new_fmt.valid_type?(v) or return io.emit("ERR invalid file type")
      new_fmt.type = v
    when "channels", "bits", "rate"
      case v
      when "bypass"
        @bypass << k unless @bypass.include?(k)
      else
        rv = set_uint(io, kv, v, false) { |u| new_fmt.__send__("#{k}=", u) }
        rv == true or return rv
        @bypass.delete(k)
      end
    when "endian"
      new_fmt.valid_endian?(v) or return io.emit("ERR invalid endian")
      new_fmt.endian = v
    end
  end

  bypass_match!(new_fmt, @current.format) if @current

  if new_fmt != @format
    restart_pipeline # calls __current_requeue

    # we must assign this after __current_requeue since __current_requeue
    # relies on the old @format for calculation
    format_update!(new_fmt)
  end
  io.emit("OK")
end

#dpc_restart(io, _) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 440

def dpc_restart(io, _)
  restart_pipeline
  io.emit('OK')
end

#dpc_rg(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 261

def dpc_rg(io, msg)
  return io.emit(@rg.to_hsh.to_yaml) if msg.empty?
  before = @rg.to_hsh
  msg.each do |kv|
    k, v = kv.split('=', 2)
    case k
    when "mode"
      case v
      when "off"
        @rg.mode = nil
      else
        DTAS::RGState::RG_MODE.include?(v) or
          return io.emit("ERR rg mode invalid")
        @rg.mode = v
      end
    when "fallback_track"
      rv = set_bool(io, kv, v) { |b| @rg.fallback_track = b }
      rv == true or return rv
    when %r{(?:preamp|norm_level|fallback_gain|volume)[+-]?\z}x
      rv = adjust_numeric(io, @rg, k, v)
      rv == true or return rv
    end
  end
  after = @rg.to_hsh
  __current_requeue if before != after
  io.emit("OK")
end

#dpc_seek(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 399

def dpc_seek(io, msg)
  offset = msg[0] or return io.emit('ERR usage: seek OFFSET')
  if @current
    if @current.respond_to?(:infile)
      begin
        if direction = __offset_direction(offset)
          offset = __seek_offset_adj(direction, offset)
        # else: pass to sox directly
        end
      rescue ArgumentError
        return io.emit("ERR bad time format")
      end
      seek_internal(@current, offset)
    else
      return io.emit("ERR unseekable")
    end
  elsif @paused
    case file = @queue[0]
    when String
      @queue[0] = [ file, offset ]
    when Array # offset already stored, adjust
      if direction = __offset_direction(offset)
        tmp = try_file(*file)
        cur_off = __offset_to_i(file[1].dup, tmp)
        offset = __seek_offset_adj(direction, offset, tmp, cur_off)
      end
      file[1] = offset
    else
      return io.emit("ERR unseekable")
    end
  # unpaused case... what do we do?
  end
  io.emit("OK")
end

#dpc_sink(io, msg) ⇒ Object

returns a wait_ctl arg



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# File 'lib/dtas/player/client_handler.rb', line 122

def dpc_sink(io, msg)
  name = msg[1]
  case msg[0]
  when "ls"
    io.emit(xs(@sinks.keys.sort!))
  when "rm"
    sink = @sinks.delete(name) or return io.emit("ERR #{name} not found")
    drop_sink(sink)
    io.emit("OK")
  when "ed"
    sink = @sinks[name] || (new_sink = DTAS::Sink.new)

    # allow things that look like audio device names ("hw:1,0" , "/dev/dsp")
    # or variable names.
    sink.valid_name?(name) or return io.emit("ERR sink name invalid")

    sink.name = -name
    active_before = sink.active
    before = __sink_snapshot(sink)

    # multiple changes may be made at once
    msg[2..-1].each do |kv|
      k, v = kv.split('=', 2)
      case k
      when %r{\Aenv\.([^=]+)\z}
        sink.env[$1] = v
      when %r{\Aenv#([^=]+)\z}
        v == nil or return io.emit("ERR unset env has no value")
        sink.env.delete($1)
      when "prio"
        rv = set_int(io, kv, v, false) { |i| sink.prio = i }
        rv == true or return rv
        @targets.sort_by! { |t| t.sink.prio } if sink.active
      when "nonblock", "active"
        rv = set_bool(io, kv, v) { |b| sink.__send__("#{k}=", b) }
        rv == true or return rv
      when "pipe_size"
        rv = set_uint(io, kv, v, true) { |u| sink.pipe_size = u }
        rv == true or return rv
      when "command" # nothing to validate, this could be "rm -rf /" :>
        sink.command = v.empty? ? DTAS::Sink::SINK_DEFAULTS["command"] : v
      end
    end

    @sinks[name] = new_sink if new_sink # no errors? it's a new sink!
    after = __sink_snapshot(sink)

    # start or stop a sink if its active= flag changed.  Additionally,
    # account for a crashed-but-marked-active sink.  The user may have
    # fixed the command to not crash it.
    if (active_before != sink.active) ||
       (sink.active && (!sink.pid || before != after))
      __sink_switch(sink)
    end
    io.emit("OK")
  when "cat"
    sink = @sinks[name] or return io.emit("ERR #{name} not found")
    io.emit(sink.to_hash.to_yaml)
  else
    io.emit("ERR unknown sink op #{msg[0]}")
  end
end

#dpc_skip(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 345

def dpc_skip(io, msg)
  __current_drop
  wall("skip")
  io.emit("OK")
end

#dpc_source(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 502

def dpc_source(io, msg)
  map = @source_map
  op = msg.shift
  case op
  when "restart"
    __current_requeue
    return io.emit("OK")
  when "ls"
    s = map.keys.sort! { |a,b| map[a].tryorder <=> map[b].tryorder }
    return io.emit(s.join(' '))
  end

  name = msg.shift
  src = map[name] or return io.emit("ERR non-existent source name")
  case op
  when "cat"
    io.emit(src.to_source_cat.to_yaml)
  when "ed"
    before = src.to_state_hash.inspect
    sd = src.source_defaults
    msg.each do |kv|
      k, v = kv.split('=', 2)
      case k
      when "command"
        src.command = v.empty? ? sd[k] : v
      when %r{\Aenv\.([^=]+)\z}
        src.env[$1] = v
      when %r{\Aenv#([^=]+)\z}
        v == nil or return io.emit("ERR unset env has no value")
        src.env.delete($1)
      when "tryorder"
        rv = set_int(io, kv, v, true) { |i| src.tryorder = i || sd[k] }
        rv == true or return rv
        source_map_reload
      end
    end
    after = src.to_state_hash.inspect
    __current_requeue if before != after && @current.class == src.class
    io.emit("OK")
  else
    io.emit("ERR unknown source op")
  end
end

#dpc_state(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 575

def dpc_state(io, msg)
  case msg.shift
  when 'dump'
    dest = msg.shift
    if dest
      sf = DTAS::StateFile.new(dest, false)
    elsif @state_file
      sf = @state_file
      dest = sf.path
    else
      return io.emit("ERR no state file configured")
    end
    state_file_dump_async(io, sf)
    :ignore
  end
end

#dpc_tl(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 597

def dpc_tl(io, msg)
  sub = msg.shift
  m = "_dpc_tl_#{sub.tr('-', '_')}"
  __send__(m, io, msg) if respond_to?(m)
end

#dpc_trim(io, msg) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 858

def dpc_trim(io, msg)
  t = @trim
  case msg.size
  when 0 # OK
  when 1, 2
    case msg[0]
    when 'off'
      @trim = nil
    else
      begin
        tbeg = parse_time(msg[0])
        if tlen = msg[1]
          absolute = tlen.sub!(/\A=/, '') # 44:00 =44:55
          tlen = parse_time(tlen)
          tlen -= tbeg if absolute
        end
        @trim = [ tbeg, tlen ] # seconds as float, since we don't know rate
      rescue => e
        return io.emit("ERR #{e.message}")
      end
    end
    __current_requeue
  else
    return io.emit('ERR usage: trim [off|TBEG [TLEN]]')
  end
  t = t ? t.map(&:to_s).join(' ') : 'off'
  __wall("trim #{t}")
  io.emit(t)
end

#drop_sink(sink) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 82

def drop_sink(sink)
  @targets.delete_if do |t|
    if t.sink == sink
      drop_target(t)
      true
    else
      false
    end
  end
end

#out_samples(in_samples, infmt, outfmt) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 247

def out_samples(in_samples, infmt, outfmt)
  in_rate = infmt.rate
  out_rate = outfmt.rate
  return in_samples if in_rate == out_rate # easy!
  (in_samples * out_rate / in_rate.to_f).round
end

#play_pause_handler(io, command) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 351

def play_pause_handler(io, command)
  prev = @paused
  __send__("do_#{command}")
  io.emit({
    "paused" => {
      "before" => prev,
      "after" => @paused,
    }
  }.to_yaml)
end

#restart_pipeline ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 434

def restart_pipeline
  return if @paused
  __current_requeue
  stop_sinks
end

#seek_internal(cur, offset) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 385

def seek_internal(cur, offset)
  if cur.requeued
    @queue[0][1] = offset
  else
    @queue.unshift([ cur.infile, offset ])
    cur.requeued = true
    __buf_reset(cur.dst) # trigger EPIPE
  end
end

#set_bool(io, kv, v) ⇒ Object

returns true on success, wait_ctl arg on error



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# File 'lib/dtas/player/client_handler.rb', line 14

def set_bool(io, kv, v)
  case v
  when "false" then yield(false)
  when "true" then yield(true)
  else
    return io.emit("ERR #{kv} must be true or false")
  end
  true
end

#set_int(io, kv, v, null_ok) ⇒ Object

returns true on success, wait_ctl arg on error



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# File 'lib/dtas/player/client_handler.rb', line 47

def set_int(io, kv, v, null_ok)
  case v
  when %r{\A-?\d+\z}
    yield(v.to_i)
  when ""
    null_ok or return io.emit("ERR #{kv} must be defined")
    yield(nil)
  else
    return io.emit("ERR #{kv} must an integer")
  end
  true
end

#set_uint(io, kv, v, null_ok) ⇒ Object

returns true on success, wait_ctl arg on error



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# File 'lib/dtas/player/client_handler.rb', line 61

def set_uint(io, kv, v, null_ok)
  case v
  when %r{\A\d+\z}
    yield(v.to_i)
  when %r{\A0x[0-9a-fA-F]+\z}i # hex
    yield(v.to_i(16))
  when ""
    null_ok or return io.emit("ERR #{kv} must be defined")
    yield(nil)
  else
    return io.emit("ERR #{kv} must an non-negative integer")
  end
  true
end

#state_file_dump_async(io, sf) ⇒ Object 



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# File 'lib/dtas/player/client_handler.rb', line 557

def state_file_dump_async(io, sf)
  on_death = lambda { |_| @srv.wait_ctl(io, :wait_readable) }
  pid = fork do
    begin
      begin
        sf.dump(self)
        res = 'OK'
      rescue => e
        res = "ERR dumping to #{xs(sf.path)} #{e.message}"
      end
      io.to_io.send(res, Socket::MSG_EOR)
    ensure
      exit!(0)
    end
  end
  DTAS::Process::PIDS[pid] = on_death
end