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gmyth-stream/server/0.2/plugins/transcoders/mencoder.py
author renatofilho
Tue May 01 16:04:02 2007 +0100 (2007-05-01)
branchtrunk
changeset 608 43ce4ea2f9fb
parent 595 5c5cff842d57
child 628 c6af9d7a88b5
permissions -rw-r--r--
[svn r614] created dir for gstreamer plugins 
     1 import os

     2 import shlex

     3 import signal

     4 import subprocess

     5 import time

     6 

     7 import lib.utils as utils

     8 import lib.server as server

     9 

    10 from select import select

    11 

    12 __all__ = ("TranscoderMencoder",)

    13 

    14 class TranscoderMencoder(server.Transcoder):

    15     """Transcoder class that implements a transcoder using Mencoder"""

    16     mencoder_path = utils.which("mencoder")

    17     name = "mencoder"

    18     priority = -1

    19     args = {}

    20     proc = None

    21     gmyth = None

    22 

    23     # only works with avi container

    24     status = 0

    25 

    26     def _setup_params(self):

    27         params_first = self.params_first

    28 

    29         # general_opts

    30         self.args["local"]    = params_first("local", False)

    31         self.args["language"] = params_first("language", False)

    32         self.args["subtitle"] = params_first("subtitle", False)

    33         self.args["format"]   = params_first("format", "")

    34         self.args["outfile"]  = params_first("outfile", "-")

    35         self.args["sendback"] = params_first("sendback", True)

    36 

    37         # handle sendback variable

    38         if self.args["sendback"] == "False":

    39             self.args["sendback"] = False

    40 

    41         # input_opt

    42         uri = params_first("uri", "file:-").split(":", 1)

    43         self.args["type"]     = uri[0]

    44         self.args["input"]    = uri[1]

    45 

    46         # audio_opts

    47         self.args["acodec"]   = params_first("acodec", "mp2")

    48         self.args["abitrate"] = params_first("abitrate", 192)

    49         self.args["volume"]   = params_first("volume", 5)

    50 

    51         # video_opts

    52         self.args["mux"]      = params_first("mux", "mpeg")

    53         self.args["fps"]      = params_first("fps", 25)

    54         self.args["vcodec"]   = params_first("vcodec", "mpeg1video")

    55         self.args["vbitrate"] = params_first("vbitrate", 400)

    56         self.args["width"]    = params_first("width", 320)

    57         self.args["height"]   = params_first("height", 240)

    58     # _setup_params()

    59 

    60 

    61     def _setup_audio(self):

    62         if self.args["acodec"] == "mp3lame":

    63             audio = "-oac mp3lame -lameopts cbr:br=%s vol=%s" % (

    64                 self.args["abitrate"], self.args["volume"])

    65         else:

    66             audio = "-oac lavc -lavcopts acodec=%s:abitrate=%s" % (

    67                 self.args["acodec"], self.args["abitrate"])

    68 

    69         return audio

    70     # _setup_audio()

    71 

    72 

    73     def _setup_video(self):

    74         video = " -of %s" % self.args["mux"]

    75         video += " -ofps %s" % self.args["fps"]

    76 

    77         vcodec = self.args["vcodec"]

    78         if vcodec == "nuv" or vcodec == "xvid"\

    79                or vcodec == "qtvideo" or vcodec == "copy":

    80             video += " -ovc %s" % vcodec

    81         else:

    82             video += " -ovc lavc -lavcopts vcodec=%s:vbitrate=%s" % (

    83                 vcodec, self.args["vbitrate"])

    84 

    85         video += " %s" % self.args["format"]

    86         video += " -vf scale=%s:%s" % (self.args["width"], self.args["height"])

    87 

    88         return video

    89     # _setup_video()

    90 

    91 

    92     def _arg_append(self, args, options):

    93         for arg in shlex.split(options):

    94             args.append(arg)

    95     # arg_append()

    96 

    97     def _setup_mencoder_opts(self, args):

    98         args.append(self.mencoder_path)

    99 

   100         if self.args["outfile"] == "-" and self.args["type"]:

   101             args.append(self.args["input"])

   102         else:

   103             args.append("-")

   104 

   105         if self.args["language"]:

   106             self._arg_append(args, "-alang %s" % self.args["language"])

   107 

   108         if self.args["subtitle"]:

   109             self._arg_append(args, "-slang %s" % self.args["subtitle"])

   110             self._arg_append(args, "-subfps %s" % self.args["fps"])

   111 

   112         self._arg_append(args, "-idx")

   113         self._arg_append(args, "-cache 500")

   114         self._arg_append(args, self._setup_audio())

   115         self._arg_append(args, self._setup_video())

   116 

   117         self._arg_append(args, "-really-quiet")

   118         self._arg_append(args, "-o %s" % self.args["outfile"])

   119         self._arg_append(args, "2>%s" % os.devnull)

   120     # _setup_args()

   121 

   122 

   123     def _setup_filename(self):

   124         _type = self.args["type"]

   125 

   126         if _type == "file":

   127             if not os.path.exists(self.args["input"]):

   128                 raise IOError,\

   129                       "File requested does not exist: %s." % self.args["input"]

   130             else:

   131                 self.args["input"] = "file://%s" % self.args["input"]

   132 

   133         elif _type == "dvd":

   134             self.args["input"] = "dvd://".join(self.args["input"])

   135 

   136         elif _type == "myth":

   137             # gmyth-cat -h 192.168.1.124 -p 6543 -c 111

   138             # gmyth-cat -h 192.168.1.124 -p 6543 -f file.nuv

   139             # myth://IP:PORT:type:file

   140             self.args["gmyth-cat"] = self.args["input"].split(":")

   141             self.args["input"] = "-"

   142     # _setup_filename()

   143 

   144 

   145     def __init__(self, params):

   146         server.Transcoder.__init__(self, params)

   147         self.mencoder_opts = []

   148 

   149         try:

   150             self._setup_params()

   151             self._setup_filename()

   152             self._setup_mencoder_opts(self.mencoder_opts)

   153         except Exception, e:

   154             self.log.error(e)

   155     # __init__()

   156 

   157 

   158     def _check_opened_file(self, stdw, _stdin):

   159         loop = True

   160         while loop:

   161             try:

   162                 return open(self.args["outfile"])

   163             except:

   164                 os.write(stdw, _stdin.read(1024))

   165     # _check_opened_file

   166 

   167 

   168     def _start_outfile(self, outfd):

   169         finished = False

   170 

   171         # fix this (not necessary)

   172         outfd.write("OK")

   173 

   174         # Configuring stdin

   175         _stdin = open(self.args["input"])

   176         size = int(os.path.getsize(self.args["input"]))

   177         self.status = 0

   178         total_read = 0

   179 

   180         # Configuring pipes

   181         stdr, stdw = os.pipe()

   182 

   183         if not self._run_mencoder(input=stdr):

   184             return False

   185 

   186         stdout = self._check_opened_file(stdw, _stdin)

   187 

   188         try:

   189             while self.proc and self.proc.poll() == None:

   190                 if not finished:

   191                     data_in = _stdin.read(4096)

   192                     if data_in != "":

   193                         os.write(stdw, data_in)

   194                         total_read += 4096

   195                         d = stdout.read(4096)

   196                         if self.args["sendback"]:

   197                             outfd.write(d)

   198                         self.status = total_read * 100 / size

   199                     else:

   200                         finished = True

   201                         os.close(stdw)

   202 

   203                 else:

   204                     d = stdout.read(4096)

   205                     if self.args["sendback"] and d != "":

   206                         outfd.write(d)

   207 

   208         except Exception, e:

   209             self.log.error("Problems handling data: %s" % e)

   210             return False

   211 

   212         self.log.info("%s: Finished sending data to client" % repr(self))

   213         if not self.args["sendback"]:

   214             outfd.write("DONE")

   215 

   216         return True

   217     # _start_outfile()

   218 

   219     def _start(self, outfd):

   220         if not self._run_mencoder(output=subprocess.PIPE):

   221             return False

   222 

   223         try:

   224             while self.proc and self.proc.poll() == None:

   225                 d = self.proc.stdout.read(1024)

   226                 outfd.write(d)

   227         except Exception, e:

   228             self.log.error("Problems handling data: %s" % e)

   229             return False

   230 

   231         self.log.info("%s: Finished sending data to client" % repr(self))

   232         return True

   233     # _start()

   234 

   235     def _start_myth(self, outfd):

   236         # gmyth-cat -h 192.168.1.124 -p 6543 -c 111

   237         # gmyth-cat -h 192.168.1.124 -p 6543 -f file.nuv

   238         # myth://IP:PORT:type:file

   239         host = self.args["gmyth-cat"][0]

   240         port = self.args["gmyth-cat"][1]

   241         kind = self.args["gmyth-cat"][2]

   242         fchan = self.args["gmyth-cat"][3]

   243 

   244         gmyth_cat = utils.which("gmyth-cat")

   245         opts = [gmyth_cat, "-h", host, "-p", port, "-" + kind, fchan]

   246         gr, gw = os.pipe()

   247 

   248         try:

   249             self.gmyth = subprocess.Popen(opts, stdout=subprocess.PIPE, close_fds=True)

   250         except Exception, e:

   251             self.log.error("Error executing gmyth-cat: %s" % e)

   252             return False

   253 

   254         if not self._run_mencoder(input=self.gmyth.stdout, output=subprocess.PIPE):

   255             return False

   256 

   257         try:

   258             while self.proc and self.proc.poll() == None:

   259                 r, w, x = select([self.proc.stdout], [], [], 0)

   260                 if self.proc.stdout in r:

   261                     d = self.proc.stdout.read(4096)

   262                     outfd.write(d)

   263         except Exception, e:

   264             self.log.error("Problems handling data: %s" % e)

   265             return False

   266 

   267         return True

   268     # _start_myth()

   269 

   270     def _run_mencoder(self, input=None, output=None):

   271         try:

   272             self.proc = subprocess.Popen(self.mencoder_opts, stdin=input,

   273                                          stdout=output, close_fds=True)

   274         except Exception, e:

   275             self.log.error("Error executing mencoder: %s" % e)

   276             return False

   277 

   278         return True

   279     # _run_mencoder()

   280 

   281     def start(self, outfd):

   282         cmd = " ".join(self.mencoder_opts)

   283         self.log.debug("Mencoder: %s" % cmd)

   284 

   285         ret = False

   286 

   287         if self.args["outfile"] == "-" and self.args["type"] in ["file", "dvd"]:

   288             ret = self._start(outfd)

   289 

   290         elif self.args["type"] == "myth":

   291             ret = self._start_myth(outfd)

   292 

   293         else:

   294             ret = self._start_outfile(outfd)

   295 

   296         self.stop()

   297         return ret

   298     # start()

   299 

   300 

   301     def stop(self):

   302         if self.proc:

   303             try:

   304                 os.kill(self.proc.pid, signal.SIGKILL)

   305             except OSError, e:

   306                 pass

   307 

   308             try:

   309                 self.proc.wait()

   310             except Exception, e:

   311                 pass

   312 

   313             self.proc = None

   314 

   315         if self.gmyth:

   316             try:

   317                 os.kill(self.gmyth.pid, signal.SIGKILL)

   318             except OSError, e:

   319                 pass

   320 

   321             try:

   322                 self.gmyth.wait()

   323             except Exception, e:

   324                 pass

   325 

   326             self.gmyth = None

   327 

   328     # stop()

   329 

   330 # TranscoderMencoder
gmyth