Source Code for Module timeside.grapher.waveform_transparent

 1  # -*- coding: utf-8 -*- 
 2  # 
 3  # Copyright (c) 2007-2010 Guillaume Pellerin <yomguy@parisson.com> 
 4  # Copyright (c) 2010 Olivier Guilyardi <olivier@samalyse.com> 
 5   
 6  # This file is part of TimeSide. 
 7   
 8  # TimeSide is free software: you can redistribute it and/or modify 
 9  # it under the terms of the GNU General Public License as published by 
10  # the Free Software Foundation, either version 2 of the License, or 
11  # (at your option) any later version. 
12   
13  # TimeSide is distributed in the hope that it will be useful, 
14  # but WITHOUT ANY WARRANTY; without even the implied warranty of 
15  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
16  # GNU General Public License for more details. 
17   
18  # You should have received a copy of the GNU General Public License 
19  # along with TimeSide.  If not, see <http://www.gnu.org/licenses/>. 
20   
21   
22  from timeside.core import Processor, implements, interfacedoc, FixedSizeInputAdapter 
23  from timeside.api import IGrapher 
24  from timeside.grapher.core import * 
25  from timeside.grapher.waveform_simple import Waveform 
26   
27   
28 -class WaveformTransparent(Waveform): 
29      """ Builds a PIL image representing a transparent waveform of the audio stream. 
30      """ 
31   
32      implements(IGrapher) 
33   
34      @interfacedoc 
35 -    def __init__(self, width=1024, height=256, bg_color=None, color_scheme='default'): 
36          super(WaveformTransparent, self).__init__(width, height, bg_color, color_scheme) 
37          self.line_color = (255,255,255) 
38   
39      @staticmethod 
40      @interfacedoc 
41 -    def id(): 
42          return "waveform_transparent" 
43   
44      @staticmethod 
45      @interfacedoc 
46 -    def name(): 
47          return "Waveform transparent" 
48   
49      @interfacedoc 
50 -    def setup(self, channels=None, samplerate=None, blocksize=None, totalframes=None): 
51          super(WaveformTransparent, self).setup(channels, samplerate, blocksize, totalframes) 
52   
53      @interfacedoc 
54 -    def process(self, frames, eod=False): 
55          if len(frames) != 1: 
56              buffer = frames[:,0] 
57              buffer.shape = (len(buffer),1) 
58              for samples, end in self.pixels_adapter.process(buffer, eod): 
59                  if self.pixel_cursor < self.image_width-1: 
60                      self.draw_peaks_inverted(self.pixel_cursor, peaks(samples), self.line_color) 
61                      self.pixel_cursor += 1 
62              if self.pixel_cursor == self.image_width-1: 
63                  self.draw_peaks_inverted(self.pixel_cursor, peaks(samples), self.line_color) 
64                  self.pixel_cursor += 1 
65          return frames, eod 
66