readcd.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Lib » plat-irix5 » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » Lib » plat irix5 » readcd.py
# Class interface to the CD module.

import cd, CD

class Error(Exception):
  pass
class _Stop(Exception):
  pass

def _doatime(self, cb_type, data):
  if ((data[0] * 60) + data[1]) * 75 + data[2] > self.end:
##    print 'done with list entry',`self.listindex`
    raise _Stop
  func, arg = self.callbacks[cb_type]
  if func:
    func(arg, cb_type, data)

def _dopnum(self, cb_type, data):
  if data > self.end:
##    print 'done with list entry',`self.listindex`
    raise _Stop
  func, arg = self.callbacks[cb_type]
  if func:
    func(arg, cb_type, data)

class Readcd:
  def __init__(self, *arg):
    if len(arg) == 0:
      self.player = cd.open()
    elif len(arg) == 1:
      self.player = cd.open(arg[0])
    elif len(arg) == 2:
      self.player = cd.open(arg[0], arg[1])
    else:
      raise Error, 'bad __init__ call'
    self.list = []
    self.callbacks = [(None, None)] * 8
    self.parser = cd.createparser()
    self.playing = 0
    self.end = 0
    self.status = None
    self.trackinfo = None

  def eject(self):
    self.player.eject()
    self.list = []
    self.end = 0
    self.listindex = 0
    self.status = None
    self.trackinfo = None
    if self.playing:
##      print 'stop playing from eject'
      raise _Stop

  def pmsf2msf(self, track, min, sec, frame):
    if not self.status:
      self.cachestatus()
    if track < self.status[5] or track > self.status[6]:
      raise Error, 'track number out of range'
    if not self.trackinfo:
      self.cacheinfo()
    start, total = self.trackinfo[track]
    start = ((start[0] * 60) + start[1]) * 75 + start[2]
    total = ((total[0] * 60) + total[1]) * 75 + total[2]
    block = ((min * 60) + sec) * 75 + frame
    if block > total:
      raise Error, 'out of range'
    block = start + block
    min, block = divmod(block, 75*60)
    sec, frame = divmod(block, 75)
    return min, sec, frame

  def reset(self):
    self.list = []

  def appendtrack(self, track):
    self.appendstretch(track, track)
        
  def appendstretch(self, start, end):
    if not self.status:
      self.cachestatus()
    if not start:
      start = 1
    if not end:
      end = self.status[6]
    if type(end) == type(0):
      if end < self.status[5] or end > self.status[6]:
        raise Error, 'range error'
    else:
      l = len(end)
      if l == 4:
        prog, min, sec, frame = end
        if prog < self.status[5] or prog > self.status[6]:
          raise Error, 'range error'
        end = self.pmsf2msf(prog, min, sec, frame)
      elif l != 3:
        raise Error, 'syntax error'
    if type(start) == type(0):
      if start < self.status[5] or start > self.status[6]:
        raise Error, 'range error'
      if len(self.list) > 0:
        s, e = self.list[-1]
        if type(e) == type(0):
          if start == e+1:
            start = s
            del self.list[-1]
    else:
      l = len(start)
      if l == 4:
        prog, min, sec, frame = start
        if prog < self.status[5] or prog > self.status[6]:
          raise Error, 'range error'
        start = self.pmsf2msf(prog, min, sec, frame)
      elif l != 3:
        raise Error, 'syntax error'
    self.list.append((start, end))

  def settracks(self, list):
    self.list = []
    for track in list:
      self.appendtrack(track)

  def setcallback(self, cb_type, func, arg):
    if cb_type < 0 or cb_type >= 8:
      raise Error, 'type out of range'
    self.callbacks[cb_type] = (func, arg)
    if self.playing:
      start, end = self.list[self.listindex]
      if type(end) == type(0):
        if cb_type != CD.PNUM:
          self.parser.setcallback(cb_type, func, arg)
      else:
        if cb_type != CD.ATIME:
          self.parser.setcallback(cb_type, func, arg)

  def removecallback(self, cb_type):
    if cb_type < 0 or cb_type >= 8:
      raise Error, 'type out of range'
    self.callbacks[cb_type] = (None, None)
    if self.playing:
      start, end = self.list[self.listindex]
      if type(end) == type(0):
        if cb_type != CD.PNUM:
          self.parser.removecallback(cb_type)
      else:
        if cb_type != CD.ATIME:
          self.parser.removecallback(cb_type)

  def gettrackinfo(self, *arg):
    if not self.status:
      self.cachestatus()
    if not self.trackinfo:
      self.cacheinfo()
    if len(arg) == 0:
      return self.trackinfo[self.status[5]:self.status[6]+1]
    result = []
    for i in arg:
      if i < self.status[5] or i > self.status[6]:
        raise Error, 'range error'
      result.append(self.trackinfo[i])
    return result

  def cacheinfo(self):
    if not self.status:
      self.cachestatus()
    self.trackinfo = []
    for i in range(self.status[5]):
      self.trackinfo.append(None)
    for i in range(self.status[5], self.status[6]+1):
      self.trackinfo.append(self.player.gettrackinfo(i))

  def cachestatus(self):
    self.status = self.player.getstatus()
    if self.status[0] == CD.NODISC:
      self.status = None
      raise Error, 'no disc in player'

  def getstatus(self):
    return self.player.getstatus()

  def play(self):
    if not self.status:
      self.cachestatus()
    size = self.player.bestreadsize()
    self.listindex = 0
    self.playing = 0
    for i in range(8):
      func, arg = self.callbacks[i]
      if func:
        self.parser.setcallback(i, func, arg)
      else:
        self.parser.removecallback(i)
    if len(self.list) == 0:
      for i in range(self.status[5], self.status[6]+1):
        self.appendtrack(i)
    try:
      while 1:
        if not self.playing:
          if self.listindex >= len(self.list):
            return
          start, end = self.list[self.listindex]
          if type(start) == type(0):
            dummy = self.player.seektrack(
              start)
          else:
            min, sec, frame = start
            dummy = self.player.seek(
              min, sec, frame)
          if type(end) == type(0):
            self.parser.setcallback(
              CD.PNUM, _dopnum, self)
            self.end = end
            func, arg = \
                  self.callbacks[CD.ATIME]
            if func:
              self.parser.setcallback(CD.ATIME, func, arg)
            else:
              self.parser.removecallback(CD.ATIME)
          else:
            min, sec, frame = end
            self.parser.setcallback(
              CD.ATIME, _doatime,
              self)
            self.end = (min * 60 + sec) * \
                 75 + frame
            func, arg = \
                  self.callbacks[CD.PNUM]
            if func:
              self.parser.setcallback(CD.PNUM, func, arg)
            else:
              self.parser.removecallback(CD.PNUM)
          self.playing = 1
        data = self.player.readda(size)
        if data == '':
          self.playing = 0
          self.listindex = self.listindex + 1
          continue
        try:
          self.parser.parseframe(data)
        except _Stop:
          self.playing = 0
          self.listindex = self.listindex + 1
    finally:
      self.playing = 0
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