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
|
#--
# This file is part of Sonic Pi: http://sonic-pi.net
# Full project source: https://github.com/samaaron/sonic-pi
# License: https://github.com/samaaron/sonic-pi/blob/master/LICENSE.md
#
# Copyright 2013, 2014, 2015, 2016 by Sam Aaron (http://sam.aaron.name).
# All rights reserved.
#
# Permission is granted for use, copying, modification, and
# distribution of modified versions of this work as long as this
# notice is included.
#++
require_relative "buffer"
module SonicPi
class LazyBuffer < Buffer
def initialize(server, id, prom)
@server = server
@id = id
@prom = prom
@realised = false
@prom_mut = Mutex.new
end
def num_frames
wait_for_prom unless @realised
@num_frames
end
def num_chans
wait_for_prom unless @realised
@num_chans
end
def sample_rate
wait_for_prom unless @realised
@sample_rate
end
def duration
wait_for_prom unless @realised
@duration
end
def to_s
wait_for_prom unless @realised
if @path
"#<Buffer @id=#{@id}, @num_chans=#{@num_chans}, @num_frames=#{@num_frames}, @sample_rate=#{@sample_rate}, @duration=#{@duration}, @path=#{@path}>"
else
"#<Buffer @id=#{@id}, @num_chans=#{@num_chans.inspect}, @num_frames=#{@num_frames}, @sample_rate=#{@sample_rate}, @duration=#{@duration}>"
end
end
def wait_for_allocation
wait_for_prom
end
private
def wait_for_prom
return true if @realised
@prom_mut.synchronize do
return true if @realised
res = @prom.get
if res.is_a? Exception
raise res
else
num_frames, num_chans, sample_rate = res
end
@num_frames = num_frames
@num_chans = num_chans
@sample_rate = sample_rate
@duration = num_frames.to_f / sample_rate.to_f
@state = :live
@mutex = Mutex.new
@path = nil
@realised = true
end
end
end
end
|
