Class: DTAS::Player

Inherits:
Object
  • Object
show all
Includes:
ClientHandler, XS
Defined in:
lib/dtas/player.rb

Overview

the core of dtas-player(1)

Defined Under Namespace

Modules: ClientHandler

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ClientHandler

#__bp_goto, #__bp_prev_next, #__bp_seek, #__buf_reset, #__current_decoded_samples, #__current_requeue, #__goto_offset_samples, #__offset_direction, #__offset_to_i, #__offset_to_samples, #__seek_offset_adj, #__sink_activate, #__sink_snapshot, #__sink_switch, #_dpc_tl_add, #_dpc_tl_clear, #_dpc_tl_consume, #_dpc_tl_current, #_dpc_tl_current_id, #_dpc_tl_get, #_dpc_tl_goto, #_dpc_tl_max, #_dpc_tl_next, #_dpc_tl_prev, #_dpc_tl_remove, #_dpc_tl_repeat, #_dpc_tl_shuffle, #_dpc_tl_swap, #_dpc_tl_tracks, #_tl_skip, #active_sinks, #adjust_numeric, #bytes_decoded, #current_expect_samples, #do_pause, #do_play, #do_play_pause, #dpc_cd, #dpc_cue, #dpc_current, #dpc_env, #dpc_format, #dpc_restart, #dpc_rg, #dpc_seek, #dpc_sink, #dpc_skip, #dpc_source, #dpc_state, #dpc_tl, #dpc_trim, #drop_sink, #out_samples, #play_pause_handler, #restart_pipeline, #seek_internal, #set_bool, #set_int, #set_uint, #state_file_dump_async

Methods included from ParseTime

#parse_time

Methods included from XS

#xs

Constructor Details

#initialize ⇒ Player

Returns a new instance of Player.



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# File 'lib/dtas/player.rb', line 31

def initialize
  @tl = DTAS::Tracklist.new
  @state_file = nil
  @socket = nil
  @srv = nil
  @queue = [] # files for sources, or commands
  @paused = false
  @format = DTAS::Format.new
  @bypass = [] # %w(rate bits channels) (not worth Hash overhead)

  @sinks = {} # { user-defined name => sink }
  @targets = [] # order matters
  @rg = DTAS::RGState.new

  # sits in between shared effects (if any) and sinks
  @sink_buf = DTAS::Buffer.new
  @current = nil
  @watchers = {}
  @trim = nil
  @source_map = {
    "sox" => (sox = DTAS::Source::Sox.new),
    "av" => DTAS::Source::Av.new,
    "ff" => DTAS::Source::Ff.new,
    "splitfx" => DTAS::Source::SplitFX.new(sox),
  }
  source_map_reload
end

Instance Attribute Details

#sinks ⇒ Object (readonly)

Returns the value of attribute sinks.



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# File 'lib/dtas/player.rb', line 29

def sinks
  @sinks
end

#socket ⇒ Object

Returns the value of attribute socket.



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# File 'lib/dtas/player.rb', line 28

def socket
  @socket
end

#state_file ⇒ Object

Returns the value of attribute state_file.



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# File 'lib/dtas/player.rb', line 27

def state_file
  @state_file
end

Class Method Details

.load(hash) ⇒ Object 



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# File 'lib/dtas/player.rb', line 126

def self.load(hash)
  rv = new
  rv.instance_eval do
    if v = hash["tracklist"]
      @tl = DTAS::Tracklist.load(v)
    end
    @rg = DTAS::RGState.load(hash["rg"])
    if v = hash["sink_buf"]
      v = v["buffer_size"]
      @sink_buf.buffer_size = v
    end
    %w(socket queue paused bypass trim).each do |k|
      v = hash[k] or next
      instance_variable_set("@#{k}", v)
    end
    if v = hash["source"]
      # compatibility with 0.0.0, which was sox-only
      # we'll drop this after 1.0.0, or when we support a source decoder
      # named "command" or "env" :P
      sox_cmd, sox_env = v["command"], v["env"]
      if sox_cmd || sox_env
        sox = @source_map["sox"]
        sox.command = sox_cmd if sox_cmd
        sox.env = sox_env if sox_env
      end

      # new style: name = "av" or "sox" or whatever else we may support
      @source_map.each do |name, src|
        src_hsh = v[name] or next
        src.load!(src_hsh)
      end
      source_map_reload
    end

    if v = hash["format"]
      @format = DTAS::Format.load(v)
    end

    if sinks = hash["sinks"]
      sinks.each do |sink_hsh|
        sink_hsh['name'] = -sink_hsh['name']
        sink = DTAS::Sink.load(sink_hsh)
        @sinks[sink.name] = sink
      end
    end
  end
  rv
end

Instance Method Details

#__current_drop(src = @current) ⇒ Object

only call on unrecoverable errors (or “skip”)



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# File 'lib/dtas/player.rb', line 441

def __current_drop(src = @current)
  __buf_reset(src.dst) if src && src.pid
end

#__wall(msg) ⇒ Object 



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# File 'lib/dtas/player.rb', line 67

def __wall(msg)
  @watchers.delete_if do |io, _|
    if io.closed?
      true
    else
      case io.emit(msg)
      when :wait_readable, :wait_writable
        false
      else
        true
      end
    end
  end
  $stdout.write("#{msg}\n")
end

#_next ⇒ Object 



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# File 'lib/dtas/player.rb', line 262

def _next
  @queue.shift || @tl.advance_track
end

#_optimize_write_prepare(targets) ⇒ Object 



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# File 'lib/dtas/player.rb', line 292

def _optimize_write_prepare(targets)
  targets.each do |dst|
    dst.wait_writable_prepare
    @srv.wait_ctl(dst, :wait_writable)
  end
end

#bind ⇒ Object 



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# File 'lib/dtas/player.rb', line 319

def bind
  @srv = DTAS::UNIXServer.new(@socket)
end

#broadcast_iter(buf, targets) ⇒ Object

returns a wait_ctl arg for self



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# File 'lib/dtas/player.rb', line 300

def broadcast_iter(buf, targets)
  case rv = buf.broadcast(targets)
  when Array # array of blocked sinks
    # have sinks wake up the this buffer when they're writable
    trade_ctl = proc { @srv.wait_ctl(buf, :hot_read) }
    rv.each do |dst|
      dst.on_writable = trade_ctl
      @srv.wait_ctl(dst, :wait_writable)
    end

    # this @sink_buf hibernates until trade_ctl is called
    # via DTAS::Sink#writable_iter
    :ignore
  else # :wait_readable or nil
    _optimize_write_prepare(targets)
    rv
  end
end

#bypass_match!(dst_fmt, src_fmt) ⇒ Object 



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# File 'lib/dtas/player.rb', line 492

def bypass_match!(dst_fmt, src_fmt)
  @bypass.each do |k|
    dst_fmt.__send__("#{k}=", src_fmt.__send__(k))
  end
  dst_fmt
end

#client_iter(io, msg) ⇒ Object

yielded from readable_iter



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

def client_iter(io, msg)
  msg = Shellwords.split(msg)
  command = msg.shift
  case command
  when "enq"
    enq_handler(io, -msg[0])
  when "enq-cmd"
    enq_handler(io, { "command" => -msg[0]})
  when "pause", "play", "play_pause"
    play_pause_handler(io, command)
  when "pwd"
    io.emit(-Dir.pwd)
  else
    m = "dpc_#{command.tr('-', '_')}"
    __send__(m, io, msg) if respond_to?(m)
  end
end

#close ⇒ Object 



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# File 'lib/dtas/player.rb', line 486

def close
  @srv = @srv.close if @srv
  @sink_buf.close!
  @state_file.dump(self, true) if @state_file
end

#create_default_sink ⇒ Object

only used on new installations where no sink exists



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# File 'lib/dtas/player.rb', line 324

def create_default_sink
  return unless @sinks.empty?
  s = DTAS::Sink.new
  s.name = "default"
  s.active = true
  @sinks[s.name] = s
end

#dpc_clear(io, msg) ⇒ Object 



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

def dpc_clear(io, msg)
  @queue.clear
  wall('clear')
  io.emit('OK')
end

#dpc_enq_head(io, msg) ⇒ Object 



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# File 'lib/dtas/player.rb', line 189

def dpc_enq_head(io, msg)
  # check @queue[0] in case we have no sinks
  if need_to_queue
    @queue.unshift(msg)
  else
    next_source(msg)
  end
  io.emit("OK")
end

#dpc_queue(io, msg) ⇒ Object 



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# File 'lib/dtas/player.rb', line 224

def dpc_queue(io, msg)
  'cat' == msg[0] and io.emit(@queue.to_yaml)
end

#dpc_watch(io, _) ⇒ Object 



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# File 'lib/dtas/player.rb', line 228

def dpc_watch(io, _)
  @watchers[io] = true
  io.emit('OK')
end

#drop_target(target) ⇒ Object 



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# File 'lib/dtas/player.rb', line 431

def drop_target(target)
  @srv.wait_ctl(target, :delete)
  target.close
end

#enq_handler(io, msg) ⇒ Object 



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# File 'lib/dtas/player.rb', line 179

def enq_handler(io, msg)
  # check @queue[0] in case we have no sinks
  if need_to_queue
    @queue << msg
  else
    next_source(msg)
  end
  io.emit("OK")
end

#event_loop_iter ⇒ Object 



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# File 'lib/dtas/player.rb', line 233

def event_loop_iter
  @srv.run_once do |io, msg| # readability handler, request/response
    case io
    when @sink_buf
      sink_iter
    when DTAS::UNIXAccepted
      client_iter(io, msg)
    when DTAS::Sigevent # signal received
      reap_iter
    else
      raise "BUG: unknown event: #{io.class} #{io.inspect} #{msg.inspect}"
    end
  end
end

#format_update!(fmt) ⇒ Object 



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# File 'lib/dtas/player.rb', line 420

def format_update!(fmt)
  ary = fmt.to_hash.inject(%w(format)) { |m,(k,v)| v ? m << "#{k}=#{v}" : m }
  @format = fmt
  __wall(ary.join(' ')) # do not escape '='
end

#need_to_queue ⇒ Object 



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# File 'lib/dtas/player.rb', line 175

def need_to_queue
  @current || @queue[0] || @paused
end

#next_source(source_spec) ⇒ Object 



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# File 'lib/dtas/player.rb', line 376

def next_source(source_spec)
  @current.respond_to?(:watch_end) and @current.watch_end(@srv)
  @current = nil
  if source_spec
    case source_spec
    when String
      pending = try_file(source_spec) or return
      msg = %W(file #{pending.infile})
    when Array
      pending = try_file(*source_spec) or return
      msg = %W(file #{pending.infile} #{pending.offset_samples}s)
    else
      pending = DTAS::Source::Cmd.new(source_spec["command"])
      msg = %W(command #{pending.command_string})
    end

    if ! @bypass.empty? && pending.respond_to?(:format)
      new_fmt = bypass_match!(@format.dup, pending.format)
      if new_fmt != @format
        stop_sinks # we may fail to start below
        format_update!(new_fmt)
      end
    end

    # restart sinks iff we were idle
    spawn_sinks(source_spec) or return

    dst = @sink_buf
    pending.dst_assoc(dst)
    pending.src_spawn(@format, @rg, out: dst.wr, in: DTAS.null)

    # watch and restart on modifications
    pending.respond_to?(:watch_begin) and
      @srv.wait_ctl(pending.watch_begin(method(:__current_requeue)),
                    :wait_readable)

    @current = pending
    @srv.wait_ctl(dst, :wait_readable)
    wall(msg)
  else
    player_idle
  end
end

#player_idle ⇒ Object 



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# File 'lib/dtas/player.rb', line 426

def player_idle
  stop_sinks if @sink_buf.inflight == 0
  wall("idle")
end

#reap_iter ⇒ Object 



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# File 'lib/dtas/player.rb', line 248

def reap_iter
  DTAS::Process.reaper do |status, obj|
    warn [ :reap, obj, status ].inspect if $DEBUG
    obj.on_death(status) if obj.respond_to?(:on_death)
    case obj
    when @current
      next_source(@paused ? nil : _next)
    when DTAS::Sink # on unexpected sink death
      sink_death(obj, status)
    end
  end
  :wait_readable
end

#run ⇒ Object

the main loop



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# File 'lib/dtas/player.rb', line 466

def run
  sev = DTAS::Sigevent.new
  @srv.wait_ctl(sev, :wait_readable)
  old_chld = trap(:CHLD) { sev.signal }
  create_default_sink
  next_source(@paused ? nil : _next)
  begin
    event_loop_iter
  rescue => e # just in case...
    warn "E: #{e.message} (#{e.class})"
    e.backtrace.each { |l| warn l }
  end while true
ensure
  __current_requeue
  stop_sinks
  trap(:CHLD, old_chld)
  sev.close if sev
  # for state file
end

#sink_death(sink, status) ⇒ Object 



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# File 'lib/dtas/player.rb', line 266

def sink_death(sink, status)
  deleted = []
  @targets.delete_if do |t|
    if t.sink == sink
      deleted << t
    else
      false
    end
  end

  if deleted[0]
    warn("#{sink.name} died unexpectedly: #{status.inspect}")
    deleted.each { |t| drop_target(t) }
    do_pause unless @targets[0]
    return # sink stays dead if it died unexpectedly
  end

  return unless sink.active

  if (@current || @queue[0]) && !@paused
    # we get here if source/sinks are all killed in dpc_restart
    __sink_activate(sink)
    next_source(_next) unless @current
  end
end

#sink_iter ⇒ Object

pull data from sink_buf into @targets, source feeds into sink_buf



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# File 'lib/dtas/player.rb', line 446

def sink_iter
  wait_iter = broadcast_iter(@sink_buf, @targets)
  do_pause if nil == wait_iter # sink error, stop source
  return wait_iter if @current

  # no source left to feed sink_buf, drain the remaining data
  sink_bytes = @sink_buf.inflight
  if sink_bytes > 0
    return wait_iter if @targets[0] # play what is leftover

    # discard the buffer if no sinks
    @sink_buf.discard(sink_bytes)
  end

  # nothing left inflight, stop the sinks until we have a source
  stop_sinks
  :ignore
end

#source_map_reload ⇒ Object 



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# File 'lib/dtas/player.rb', line 59

def source_map_reload
  @sources = @source_map.values.sort_by(&:tryorder)
end

#spawn_sinks(source_spec) ⇒ Object

called when the player is leaving idle state



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# File 'lib/dtas/player.rb', line 333

def spawn_sinks(source_spec)
  return true if @targets[0]
  @sinks.each_value do |sink|
    sink.active or next
    next if sink.pid
    @targets.concat(sink.sink_spawn(@format))
  end
  if @targets[0]
    @targets.sort_by! { |t| t.sink.prio }
    true
  else
    # fail, no active sink
    @queue.unshift(source_spec)
    false
  end
end

#stop_sinks ⇒ Object 



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# File 'lib/dtas/player.rb', line 436

def stop_sinks
  @targets.each { |t| drop_target(t) }.clear
end

#to_hsh ⇒ Object

used for state file



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# File 'lib/dtas/player.rb', line 84

def to_hsh
  rv = {}
  rv["socket"] = @socket
  rv["paused"] = @paused if @paused
  rv["trim"] = @trim if @trim
  src_map = rv["source"] = {}
  @source_map.each do |name, src|
    src_hsh = src.to_state_hash
    src_map[name] = src_hsh unless src_hsh.empty?
  end

  # Arrays
  rv["queue"] = @queue
  rv["bypass"] = @bypass.sort!

  %w(rg sink_buf format).each do |k|
    rv[k] = instance_variable_get("@#{k}").to_hsh
  end

  rv["tracklist"] = @tl.to_hsh

  # no empty hashes or arrays
  rv.delete_if do |k,v|
    case v
    when Hash, Array
      v.empty?
    else
      false
    end
  end

  unless @sinks.empty?
    sinks = rv["sinks"] = []
    # sort sinks by name for human viewability
    @sinks.keys.sort!.each do |name|
      sinks << @sinks[name].to_hsh
    end
  end

  rv
end

#try_file(file, offset = nil) ⇒ Object 



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# File 'lib/dtas/player.rb', line 350

def try_file(file, offset = nil)
  @sources.each do |src|
    rv = src.try(file, offset, @trim) and return rv
  end

  # keep going down the list until we find something
  while source_spec = @queue.shift
    path, off = source_spec
    @sources.each do |src|
      rv = src.try(path, off, @trim) and return rv
    end
  end

  # don't get stuck in an infinite loop if @tl.repeat==true and we can't
  # decode anything (FS errors, sox uninstalled, etc...)
  while path_off = @tl.advance_track(false)
    path, off = path_off
    @sources.each do |src|
      rv = src.try(path, off, @trim) and return rv
    end
  end

  player_idle
  nil
end

#wall(msg) ⇒ Object 



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# File 'lib/dtas/player.rb', line 63

def wall(msg)
  __wall(xs(msg))
end