everything related to duct tape audio suite (dtas)
 help / color / mirror / Atom feed
ea489264c9c0887378be6312e7d82bf73c7cfdd1 blob 12344 bytes (raw)

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
 
# Copyright (C) 2013-2014, Eric Wong <e@80x24.org> and all contributors
# License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
require 'yaml'
require 'shellwords'
require_relative '../dtas'
require_relative 'xs'
require_relative 'source'
require_relative 'source/sox'
require_relative 'source/av'
require_relative 'source/ff'
require_relative 'source/splitfx'
require_relative 'source/cmd'
require_relative 'sink'
require_relative 'unix_server'
require_relative 'buffer'
require_relative 'sigevent'
require_relative 'rg_state'
require_relative 'state_file'
require_relative 'tracklist'

class DTAS::Player # :nodoc:
  require_relative 'player/client_handler'
  include DTAS::XS
  include DTAS::Player::ClientHandler
  attr_accessor :state_file
  attr_accessor :socket
  attr_reader :sinks

  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 = {}
    @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

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

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

  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

  # used for state file
  def to_hsh
    rv = {}
    rv["socket"] = @socket
    rv["paused"] = @paused if @paused
    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

  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).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 = DTAS::Sink.load(sink_hsh)
          @sinks[sink.name] = sink
        end
      end
    end
    rv
  end

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

  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

  def do_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

  # yielded from readable_iter
  def client_iter(io, msg)
    msg = Shellwords.split(msg)
    command = msg.shift
    case command
    when "enq"
      enq_handler(io, msg[0])
    when "enq-head"
      do_enq_head(io, msg)
    when "enq-cmd"
      enq_handler(io, { "command" => msg[0]})
    when "pause", "play", "play_pause"
      play_pause_handler(io, command)
    when "seek"
      do_seek(io, msg[0])
    when "clear"
      @queue.clear
      wall("clear")
      io.emit("OK")
    when "rg"
      rg_handler(io, msg)
    when "cue"
      cue_handler(io, msg)
    when "skip"
      skip_handler(io, msg)
    when "sink"
      sink_handler(io, msg)
    when "current"
      current_handler(io, msg)
    when "watch"
      @watchers[io] = true
      io.emit("OK")
    when "format"
      format_handler(io, msg)
    when "env"
      env_handler(io, msg)
    when "restart"
      restart_pipeline
      io.emit("OK")
    when "source"
      source_handler(io, msg)
    when "state"
      state_file_handler(io, msg)
    when "cd"
      chdir_handler(io, msg)
    when "pwd"
      io.emit(Dir.pwd)
    when "tl"
      tl_handler(io, msg)
    end
  end

  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

  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

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

  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) }
      __current_drop 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 restart_pipeline
      __sink_activate(sink)
      next_source(_next) unless @current
    end
  end

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

  # returns a wait_ctl arg for self
  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

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

  # only used on new installations where no sink exists
  def create_default_sink
    return unless @sinks.empty?
    s = DTAS::Sink.new
    s.name = "default"
    s.active = true
    @sinks[s.name] = s
  end

  # called when the player is leaving idle state
  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.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

  def try_file(*args)
    @sources.each do |src|
      rv = src.try(*args) and return rv
    end

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

    player_idle
    nil
  end

  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

      unless @bypass.empty?
        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.spawn(@format, @rg, out: dst.wr, in: "/dev/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

  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

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

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

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

  # only call on unrecoverable errors (or "skip")
  def __current_drop(src = @current)
    __buf_reset(src.dst) if src && src.pid
  end

  # pull data from sink_buf into @targets, source feeds into sink_buf
  def sink_iter
    wait_iter = broadcast_iter(@sink_buf, @targets)
    __current_drop 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

  # the main loop
  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

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

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

solving ea48926 ...
found ea48926 in https://80x24.org/dtas.git

everything related to duct tape audio suite (dtas)

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://80x24.org/dtas-all
	git clone --mirror http://ou63pmih66umazou.onion/dtas-all

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 dtas-all dtas-all/ https://80x24.org/dtas-all \
		dtas-all@nongnu.org
	public-inbox-index dtas-all

Example config snippet for mirrors.
Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.audio.dtas
	nntp://ou63pmih66umazou.onion/inbox.comp.audio.dtas
 note: .onion URLs require Tor: https://www.torproject.org/

code repositories for the project(s) associated with this inbox:

	dtas.git

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git