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Guido van Rossum
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Introduction.
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A number of programs have been written which access the Silicon
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Graphics CD-ROM player. These programs all use the interface defined
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in readcd.py (see readcd.doc for documentation).
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Specifying music stretches.
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The programs that are capable of reading music CD's all use the same
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syntax to describe which part of the CD is to be read. The syntax
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closely corresponds to the available methods in readcd.py.
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The music to be read is divided into stretches of music. Each stretch
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must be specified as a separate argument on the command line. A
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stretch can be a whole CD track, specified as a single number; or it
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can be a start time and a end time. The start and end times must be
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specified as a tuple, thus: ``(starttime, endtime)''. Don't forget to
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quote the parenthesis to the shell. Both starttime and endtime can be
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``None'', a simple number which refers to a CD track, or a tuple
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consisting of either 3 or 4 elements. A starttime of ``None'' refers
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to the start of the CD, an endtime of ``None'' refers to the end of
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the CD. A tuple of 3 elements is an absolute time on the CD. The
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three elements are (minutes, seconds, frames). A tuple of 4 elements
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is a track-relative time. The four elements are (track, minutes,
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seconds, frames).
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When one stretch ends at the end of a track and the following stretch
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starts at the next track, there is the option of either playing or not
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playing the pause between the two tracks. When either the end time of
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the first stretch or the start time of the second stretch is specified
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using absolute or track-relative times, the pause will not be played.
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When both times are specified as simple track numbers, the pause will
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be played.
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If no stretches are specified, the whole CD will be played.
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The programs.
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Currently, the following programs exist.
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playcd [ stretch specification ]
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Play (part of) a CD through the system loadspeaker or
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headphone set.
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cdaiff [ file [ stretch specification ] ]
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Copy (part of) a CD to a file. The file will be written in
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AIFF format. If no file is specified, cdaiff will write to
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the file ``@'' in the current directory.
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# This file implements a class which forms an interface to the .cdplayerrc
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# file that is maintained by SGI's cdplayer program.
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#
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# Usage is as follows:
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#
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# import readcd
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# r = readcd.Readcd().init()
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# c = Cdplayer().init(r.gettrackinfo())
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#
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# Now you can use c.artist, c.title and c.track[trackno] (where trackno
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# starts at 1). When the CD is not recognized, all values will be the empty
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# string.
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# It is also possible to set the above mentioned variables to new values.
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# You can then use c.write() to write out the changed values to the
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# .cdplayerrc file.
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cdplayerrc = '.cdplayerrc'
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class Cdplayer():
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def init(self, tracklist):
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import string
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self.artist = ''
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self.title = ''
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self.track = [None] + [''] * len(tracklist)
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self.id = 'd' + string.zfill(len(tracklist), 2)
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for track in tracklist:
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start, length = track
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self.id = self.id + string.zfill(length[0], 2) + \
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string.zfill(length[1], 2)
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try:
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import posix
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f = open(posix.environ['HOME'] + '/' + cdplayerrc, 'r')
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except IOError:
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return self
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import regex
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reg = regex.compile('^\\([^:]*\\):\t\\(.*\\)')
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s = self.id + '.'
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l = len(s)
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while 1:
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line = f.readline()
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if line == '':
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break
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if line[:l] == s:
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line = line[l:]
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if reg.match(line) == -1:
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print 'syntax error in ~/' + cdplayerrc
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continue
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name = line[reg.regs[1][0]:reg.regs[1][1]]
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value = line[reg.regs[2][0]:reg.regs[2][1]]
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if name == 'title':
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self.title = value
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elif name == 'artist':
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self.artist = value
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elif name[:5] == 'track':
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trackno = string.atoi(name[6:])
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self.track[trackno] = value
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f.close()
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return self
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def write(self):
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import posix
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filename = posix.environ['HOME'] + '/' + cdplayerrc
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try:
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old = open(filename, 'r')
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except IOError:
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old = open('/dev/null', 'r')
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new = open(filename + '.new', 'w')
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s = self.id + '.'
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l = len(s)
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while 1:
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line = old.readline()
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if line == '':
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break
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if line[:l] <> s:
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new.write(line)
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new.write(self.id + '.title:\t' + self.title + '\n')
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new.write(self.id + '.artist:\t' + self.artist + '\n')
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for i in range(1, len(self.track)):
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new.write(self.id + '.track.' + `i` + ':\t' + \
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self.track[i] + '\n')
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old.close()
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new.close()
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posix.rename(filename + '.new', filename)
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# This file implements a class which forms an interface to the .cdplayerrc
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# file that is maintained by SGI's cdplayer program.
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#
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# Usage is as follows:
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#
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# import readcd
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# r = readcd.Readcd().init()
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# c = Cdplayer().init(r.gettrackinfo())
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#
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# Now you can use c.artist, c.title and c.track[trackno] (where trackno
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# starts at 1). When the CD is not recognized, all values will be the empty
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# string.
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# It is also possible to set the above mentioned variables to new values.
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# You can then use c.write() to write out the changed values to the
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# .cdplayerrc file.
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cdplayerrc = '.cdplayerrc'
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class Cdplayer():
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def init(self, tracklist):
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import string
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self.artist = ''
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self.title = ''
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self.track = [None] + [''] * len(tracklist)
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self.id = 'd' + string.zfill(len(tracklist), 2)
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for track in tracklist:
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start, length = track
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self.id = self.id + string.zfill(length[0], 2) + \
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string.zfill(length[1], 2)
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try:
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import posix
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f = open(posix.environ['HOME'] + '/' + cdplayerrc, 'r')
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except IOError:
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return self
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import regex
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reg = regex.compile('^\\([^:]*\\):\t\\(.*\\)')
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s = self.id + '.'
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l = len(s)
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while 1:
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line = f.readline()
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if line == '':
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break
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if line[:l] == s:
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line = line[l:]
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if reg.match(line) == -1:
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print 'syntax error in ~/' + cdplayerrc
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continue
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name = line[reg.regs[1][0]:reg.regs[1][1]]
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value = line[reg.regs[2][0]:reg.regs[2][1]]
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if name == 'title':
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self.title = value
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elif name == 'artist':
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self.artist = value
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elif name[:5] == 'track':
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trackno = string.atoi(name[6:])
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self.track[trackno] = value
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f.close()
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return self
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def write(self):
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import posix
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filename = posix.environ['HOME'] + '/' + cdplayerrc
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try:
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old = open(filename, 'r')
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except IOError:
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old = open('/dev/null', 'r')
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new = open(filename + '.new', 'w')
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s = self.id + '.'
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l = len(s)
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while 1:
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line = old.readline()
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if line == '':
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break
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if line[:l] <> s:
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new.write(line)
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new.write(self.id + '.title:\t' + self.title + '\n')
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new.write(self.id + '.artist:\t' + self.artist + '\n')
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for i in range(1, len(self.track)):
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new.write(self.id + '.track.' + `i` + ':\t' + \
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self.track[i] + '\n')
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old.close()
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new.close()
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posix.rename(filename + '.new', filename)
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# Symbolic constants for use with sunaudiodev module
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# The names are the same as in audioio.h with the leading AUDIO_
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# removed.
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# Encoding types, for fields i_encoding and o_encoding
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ENCODING_ULAW = 1
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ENCODING_ALAW = 2
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# Gain ranges for i_gain, o_gain and monitor_gain
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MIN_GAIN = 0
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MAX_GAIN = 255
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# Port names for i_port and o_port
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PORT_A = 1
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PORT_B = 2
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PORT_C = 3
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PORT_D = 4
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SPEAKER = PORT_A
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HEADPHONE = PORT_B
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MICROPHONE = PORT_A
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# Symbolic constants for use with sunaudiodev module
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# The names are the same as in audioio.h with the leading AUDIO_
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# removed.
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# Encoding types, for fields i_encoding and o_encoding
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ENCODING_ULAW = 1
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ENCODING_ALAW = 2
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# Gain ranges for i_gain, o_gain and monitor_gain
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MIN_GAIN = 0
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MAX_GAIN = 255
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# Port names for i_port and o_port
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PORT_A = 1
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PORT_B = 2
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PORT_C = 3
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PORT_D = 4
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SPEAKER = PORT_A
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HEADPHONE = PORT_B
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MICROPHONE = PORT_A
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