Source Code for Module echonest.remix.support.midi.RawOutstreamFile

 1  # -*- coding: ISO-8859-1 -*-
 
 2  
 
 3  # standard library imports
 
 4  import sys 
 5  from types import StringType 
 6  from struct import unpack 
 7  from cStringIO import StringIO 
 8  
 
 9  # custom import
 
10  from DataTypeConverters import writeBew, writeVar, fromBytes 
11  
 
12 -class RawOutstreamFile: 
13      
 
14      """
 
15      
 
16      Writes a midi file to disk.
 
17      
 
18      """ 
19  
 
20 -    def __init__(self, outfile=''): 
21          self.buffer = StringIO() 
22          self.outfile = outfile 
23  
 
24  
 
25      # native data reading functions
 
26  
 
27  
 
28 -    def writeSlice(self, str_slice): 
29          "Writes the next text slice to the raw data" 
30          self.buffer.write(str_slice) 
31          
 
32          
 
33 -    def writeBew(self, value, length=1): 
34          "Writes a value to the file as big endian word" 
35          self.writeSlice(writeBew(value, length)) 
36  
 
37  
 
38 -    def writeVarLen(self, value): 
39          "Writes a variable length word to the file" 
40          var = self.writeSlice(writeVar(value)) 
41  
 
42  
 
43 -    def write(self): 
44          "Writes to disc" 
45          if self.outfile: 
46              if isinstance(self.outfile, StringType): 
47                  outfile = open(self.outfile, 'wb') 
48                  outfile.write(self.getvalue()) 
49                  outfile.close() 
50              else: 
51                  self.outfile.write(self.getvalue()) 
52          else: 
53              sys.stdout.write(self.getvalue()) 
54                  
 
55 -    def getvalue(self): 
56          return self.buffer.getvalue() 
57  
 
58  
 
59  if __name__ == '__main__': 
60  
 
61      out_file = 'test/midifiles/midiout.mid' 
62      out_file = '' 
63      rawOut = RawOutstreamFile(out_file) 
64      rawOut.writeSlice('MThd') 
65      rawOut.writeBew(6, 4) 
66      rawOut.writeBew(1, 2) 
67      rawOut.writeBew(2, 2) 
68      rawOut.writeBew(15360, 2) 
69      rawOut.write() 
70